path: root/recipes/linux/linux-efika-2.6.20.20/sched-cfs-v9-v2.6.20.11.patch

This is the Complete Fair Scheduler (CFS) v9 patch for
linux 2.6.20.10 patch (rediffed cleanly against .11).

http://people.redhat.com/mingo/cfs-scheduler/

Index: linux-cfs-2.6.20.8.q/Documentation/kernel-parameters.txt
===================================================================
--- linux-cfs-2.6.20.8.q.orig/Documentation/kernel-parameters.txt
+++ linux-cfs-2.6.20.8.q/Documentation/kernel-parameters.txt
@@ -914,49 +914,6 @@ and is between 256 and 4096 characters. 
 
 	mga=		[HW,DRM]
 
-	migration_cost=
-			[KNL,SMP] debug: override scheduler migration costs
-			Format: <level-1-usecs>,<level-2-usecs>,...
-			This debugging option can be used to override the
-			default scheduler migration cost matrix. The numbers
-			are indexed by 'CPU domain distance'.
-			E.g. migration_cost=1000,2000,3000 on an SMT NUMA
-			box will set up an intra-core migration cost of
-			1 msec, an inter-core migration cost of 2 msecs,
-			and an inter-node migration cost of 3 msecs.
-
-			WARNING: using the wrong values here can break
-			scheduler performance, so it's only for scheduler
-			development purposes, not production environments.
-
-	migration_debug=
-			[KNL,SMP] migration cost auto-detect verbosity
-			Format=<0|1|2>
-			If a system's migration matrix reported at bootup
-			seems erroneous then this option can be used to
-			increase verbosity of the detection process.
-			We default to 0 (no extra messages), 1 will print
-			some more information, and 2 will be really
-			verbose (probably only useful if you also have a
-			serial console attached to the system).
-
-	migration_factor=
-			[KNL,SMP] multiply/divide migration costs by a factor
-			Format=<percent>
-			This debug option can be used to proportionally
-			increase or decrease the auto-detected migration
-			costs for all entries of the migration matrix.
-			E.g. migration_factor=150 will increase migration
-			costs by 50%. (and thus the scheduler will be less
-			eager migrating cache-hot tasks)
-			migration_factor=80 will decrease migration costs
-			by 20%. (thus the scheduler will be more eager to
-			migrate tasks)
-
-			WARNING: using the wrong values here can break
-			scheduler performance, so it's only for scheduler
-			development purposes, not production environments.
-
 	mousedev.tap_time=
 			[MOUSE] Maximum time between finger touching and
 			leaving touchpad surface for touch to be considered
Index: linux-cfs-2.6.20.8.q/Documentation/sched-design-CFS.txt
===================================================================
--- /dev/null
+++ linux-cfs-2.6.20.8.q/Documentation/sched-design-CFS.txt
@@ -0,0 +1,107 @@
+[announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
+
+i'm pleased to announce the first release of the "Modular Scheduler Core
+and Completely Fair Scheduler [CFS]" patchset:
+
+   http://redhat.com/~mingo/cfs-scheduler/
+
+This project is a complete rewrite of the Linux task scheduler. My goal
+is to address various feature requests and to fix deficiencies in the
+vanilla scheduler that were suggested/found in the past few years, both
+for desktop scheduling and for server scheduling workloads.
+
+[ QuickStart: apply the patch, recompile, reboot. The new scheduler
+  will be active by default and all tasks will default to the
+  SCHED_NORMAL interactive scheduling class. ]
+
+Highlights are:
+
+ - the introduction of Scheduling Classes: an extensible hierarchy of
+   scheduler modules. These modules encapsulate scheduling policy
+   details and are handled by the scheduler core without the core
+   code assuming about them too much.
+
+ - sched_fair.c implements the 'CFS desktop scheduler': it is a
+   replacement for the vanilla scheduler's SCHED_OTHER interactivity
+   code.
+
+   i'd like to give credit to Con Kolivas for the general approach here:
+   he has proven via RSDL/SD that 'fair scheduling' is possible and that
+   it results in better desktop scheduling. Kudos Con!
+
+   The CFS patch uses a completely different approach and implementation
+   from RSDL/SD. My goal was to make CFS's interactivity quality exceed
+   that of RSDL/SD, which is a high standard to meet :-) Testing
+   feedback is welcome to decide this one way or another. [ and, in any
+   case, all of SD's logic could be added via a kernel/sched_sd.c module
+   as well, if Con is interested in such an approach. ]
+
+   CFS's design is quite radical: it does not use runqueues, it uses a
+   time-ordered rbtree to build a 'timeline' of future task execution,
+   and thus has no 'array switch' artifacts (by which both the vanilla
+   scheduler and RSDL/SD are affected).
+
+   CFS uses nanosecond granularity accounting and does not rely on any
+   jiffies or other HZ detail. Thus the CFS scheduler has no notion of
+   'timeslices' and has no heuristics whatsoever. There is only one
+   central tunable:
+
+         /proc/sys/kernel/sched_granularity_ns
+
+   which can be used to tune the scheduler from 'desktop' (low
+   latencies) to 'server' (good batching) workloads. It defaults to a
+   setting suitable for desktop workloads. SCHED_BATCH is handled by the
+   CFS scheduler module too.
+
+   due to its design, the CFS scheduler is not prone to any of the
+   'attacks' that exist today against the heuristics of the stock
+   scheduler: fiftyp.c, thud.c, chew.c, ring-test.c, massive_intr.c all
+   work fine and do not impact interactivity and produce the expected
+   behavior.
+
+   the CFS scheduler has a much stronger handling of nice levels and
+   SCHED_BATCH: both types of workloads should be isolated much more
+   agressively than under the vanilla scheduler.
+
+   ( another rdetail: due to nanosec accounting and timeline sorting,
+     sched_yield() support is very simple under CFS, and in fact under
+     CFS sched_yield() behaves much better than under any other
+     scheduler i have tested so far. )
+
+ - sched_rt.c implements SCHED_FIFO and SCHED_RR semantics, in a simpler
+   way than the vanilla scheduler does. It uses 100 runqueues (for all
+   100 RT priority levels, instead of 140 in the vanilla scheduler)
+   and it needs no expired array.
+
+ - reworked/sanitized SMP load-balancing: the runqueue-walking
+   assumptions are gone from the load-balancing code now, and
+   iterators of the scheduling modules are used. The balancing code got
+   quite a bit simpler as a result.
+
+the core scheduler got smaller by more than 700 lines:
+
+ kernel/sched.c | 1454 ++++++++++++++++------------------------------------------------
+ 1 file changed, 372 insertions(+), 1082 deletions(-)
+
+and even adding all the scheduling modules, the total size impact is
+relatively small:
+
+ 18 files changed, 1454 insertions(+), 1133 deletions(-)
+
+most of the increase is due to extensive comments. The kernel size
+impact is in fact a small negative:
+
+   text    data     bss     dec     hex filename
+  23366    4001      24   27391    6aff kernel/sched.o.vanilla
+  24159    2705      56   26920    6928 kernel/sched.o.CFS
+
+(this is mainly due to the benefit of getting rid of the expired array
+and its data structure overhead.)
+
+thanks go to Thomas Gleixner and Arjan van de Ven for review of this
+patchset.
+
+as usual, any sort of feedback, bugreports, fixes and suggestions are
+more than welcome,
+
+	Ingo
Index: linux-cfs-2.6.20.8.q/Makefile
===================================================================
--- linux-cfs-2.6.20.8.q.orig/Makefile
+++ linux-cfs-2.6.20.8.q/Makefile
@@ -1,7 +1,7 @@
 VERSION = 2
 PATCHLEVEL = 6
 SUBLEVEL = 20
-EXTRAVERSION = .11
+EXTRAVERSION = .11-cfs-v9
 NAME = Homicidal Dwarf Hamster
 
 # *DOCUMENTATION*
Index: linux-cfs-2.6.20.8.q/arch/i386/kernel/smpboot.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/arch/i386/kernel/smpboot.c
+++ linux-cfs-2.6.20.8.q/arch/i386/kernel/smpboot.c
@@ -1132,18 +1132,6 @@ exit:
 }
 #endif
 
-static void smp_tune_scheduling(void)
-{
-	unsigned long cachesize;       /* kB   */
-
-	if (cpu_khz) {
-		cachesize = boot_cpu_data.x86_cache_size;
-
-		if (cachesize > 0)
-			max_cache_size = cachesize * 1024;
-	}
-}
-
 /*
  * Cycle through the processors sending APIC IPIs to boot each.
  */
@@ -1172,7 +1160,6 @@ static void __init smp_boot_cpus(unsigne
 	x86_cpu_to_apicid[0] = boot_cpu_physical_apicid;
 
 	current_thread_info()->cpu = 0;
-	smp_tune_scheduling();
 
 	set_cpu_sibling_map(0);
 
Index: linux-cfs-2.6.20.8.q/arch/i386/kernel/syscall_table.S
===================================================================
--- linux-cfs-2.6.20.8.q.orig/arch/i386/kernel/syscall_table.S
+++ linux-cfs-2.6.20.8.q/arch/i386/kernel/syscall_table.S
@@ -319,3 +319,4 @@ ENTRY(sys_call_table)
 	.long sys_move_pages
 	.long sys_getcpu
 	.long sys_epoll_pwait
+	.long sys_sched_yield_to	/* 320 */
Index: linux-cfs-2.6.20.8.q/arch/i386/kernel/tsc.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/arch/i386/kernel/tsc.c
+++ linux-cfs-2.6.20.8.q/arch/i386/kernel/tsc.c
@@ -61,6 +61,8 @@ static inline int check_tsc_unstable(voi
 
 void mark_tsc_unstable(void)
 {
+	sched_clock_unstable_event();
+
 	tsc_unstable = 1;
 }
 EXPORT_SYMBOL_GPL(mark_tsc_unstable);
@@ -107,13 +109,7 @@ unsigned long long sched_clock(void)
 {
 	unsigned long long this_offset;
 
-	/*
-	 * in the NUMA case we dont use the TSC as they are not
-	 * synchronized across all CPUs.
-	 */
-#ifndef CONFIG_NUMA
-	if (!cpu_khz || check_tsc_unstable())
-#endif
+	if (!cpu_khz || !cpu_has_tsc)
 		/* no locking but a rare wrong value is not a big deal */
 		return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ);
 
Index: linux-cfs-2.6.20.8.q/arch/ia64/kernel/setup.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/arch/ia64/kernel/setup.c
+++ linux-cfs-2.6.20.8.q/arch/ia64/kernel/setup.c
@@ -773,7 +773,6 @@ static void __cpuinit
 get_max_cacheline_size (void)
 {
 	unsigned long line_size, max = 1;
-	unsigned int cache_size = 0;
 	u64 l, levels, unique_caches;
         pal_cache_config_info_t cci;
         s64 status;
@@ -803,8 +802,6 @@ get_max_cacheline_size (void)
 		line_size = 1 << cci.pcci_line_size;
 		if (line_size > max)
 			max = line_size;
-		if (cache_size < cci.pcci_cache_size)
-			cache_size = cci.pcci_cache_size;
 		if (!cci.pcci_unified) {
 			status = ia64_pal_cache_config_info(l,
 						    /* cache_type (instruction)= */ 1,
@@ -821,9 +818,6 @@ get_max_cacheline_size (void)
 			ia64_i_cache_stride_shift = cci.pcci_stride;
 	}
   out:
-#ifdef CONFIG_SMP
-	max_cache_size = max(max_cache_size, cache_size);
-#endif
 	if (max > ia64_max_cacheline_size)
 		ia64_max_cacheline_size = max;
 }
Index: linux-cfs-2.6.20.8.q/arch/mips/kernel/smp.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/arch/mips/kernel/smp.c
+++ linux-cfs-2.6.20.8.q/arch/mips/kernel/smp.c
@@ -245,7 +245,6 @@ void __init smp_prepare_cpus(unsigned in
 {
 	init_new_context(current, &init_mm);
 	current_thread_info()->cpu = 0;
-	smp_tune_scheduling();
 	plat_prepare_cpus(max_cpus);
 #ifndef CONFIG_HOTPLUG_CPU
 	cpu_present_map = cpu_possible_map;
Index: linux-cfs-2.6.20.8.q/arch/sparc/kernel/smp.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/arch/sparc/kernel/smp.c
+++ linux-cfs-2.6.20.8.q/arch/sparc/kernel/smp.c
@@ -69,16 +69,6 @@ void __cpuinit smp_store_cpu_info(int id
 	cpu_data(id).prom_node = cpu_node;
 	cpu_data(id).mid = cpu_get_hwmid(cpu_node);
 
-	/* this is required to tune the scheduler correctly */
-	/* is it possible to have CPUs with different cache sizes? */
-	if (id == boot_cpu_id) {
-		int cache_line,cache_nlines;
-		cache_line = 0x20;
-		cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line);
-		cache_nlines = 0x8000;
-		cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines);
-		max_cache_size = cache_line * cache_nlines;
-	}
 	if (cpu_data(id).mid < 0)
 		panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
 }
Index: linux-cfs-2.6.20.8.q/arch/sparc64/kernel/smp.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/arch/sparc64/kernel/smp.c
+++ linux-cfs-2.6.20.8.q/arch/sparc64/kernel/smp.c
@@ -1293,41 +1293,6 @@ int setup_profiling_timer(unsigned int m
 	return 0;
 }
 
-static void __init smp_tune_scheduling(void)
-{
-	struct device_node *dp;
-	int instance;
-	unsigned int def, smallest = ~0U;
-
-	def = ((tlb_type == hypervisor) ?
-	       (3 * 1024 * 1024) :
-	       (4 * 1024 * 1024));
-
-	instance = 0;
-	while (!cpu_find_by_instance(instance, &dp, NULL)) {
-		unsigned int val;
-
-		val = of_getintprop_default(dp, "ecache-size", def);
-		if (val < smallest)
-			smallest = val;
-
-		instance++;
-	}
-
-	/* Any value less than 256K is nonsense.  */
-	if (smallest < (256U * 1024U))
-		smallest = 256 * 1024;
-
-	max_cache_size = smallest;
-
-	if (smallest < 1U * 1024U * 1024U)
-		printk(KERN_INFO "Using max_cache_size of %uKB\n",
-		       smallest / 1024U);
-	else
-		printk(KERN_INFO "Using max_cache_size of %uMB\n",
-		       smallest / 1024U / 1024U);
-}
-
 /* Constrain the number of cpus to max_cpus.  */
 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
@@ -1363,7 +1328,6 @@ void __init smp_prepare_cpus(unsigned in
 	}
 
 	smp_store_cpu_info(boot_cpu_id);
-	smp_tune_scheduling();
 }
 
 /* Set this up early so that things like the scheduler can init
Index: linux-cfs-2.6.20.8.q/fs/proc/array.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/fs/proc/array.c
+++ linux-cfs-2.6.20.8.q/fs/proc/array.c
@@ -165,7 +165,6 @@ static inline char * task_state(struct t
 	rcu_read_lock();
 	buffer += sprintf(buffer,
 		"State:\t%s\n"
-		"SleepAVG:\t%lu%%\n"
 		"Tgid:\t%d\n"
 		"Pid:\t%d\n"
 		"PPid:\t%d\n"
@@ -173,9 +172,8 @@ static inline char * task_state(struct t
 		"Uid:\t%d\t%d\t%d\t%d\n"
 		"Gid:\t%d\t%d\t%d\t%d\n",
 		get_task_state(p),
-		(p->sleep_avg/1024)*100/(1020000000/1024),
-	       	p->tgid, p->pid,
-	       	pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
+		p->tgid, p->pid,
+		pid_alive(p) ? rcu_dereference(p->real_parent)->tgid : 0,
 		pid_alive(p) && p->ptrace ? rcu_dereference(p->parent)->pid : 0,
 		p->uid, p->euid, p->suid, p->fsuid,
 		p->gid, p->egid, p->sgid, p->fsgid);
@@ -312,6 +310,11 @@ int proc_pid_status(struct task_struct *
 	return buffer - orig;
 }
 
+int proc_pid_sched(struct task_struct *task, char *buffer)
+{
+	return sched_print_task_state(task, buffer) - buffer;
+}
+
 static int do_task_stat(struct task_struct *task, char * buffer, int whole)
 {
 	unsigned long vsize, eip, esp, wchan = ~0UL;
Index: linux-cfs-2.6.20.8.q/fs/proc/base.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/fs/proc/base.c
+++ linux-cfs-2.6.20.8.q/fs/proc/base.c
@@ -1839,6 +1839,7 @@ static struct pid_entry tgid_base_stuff[
 	INF("environ",    S_IRUSR, pid_environ),
 	INF("auxv",       S_IRUSR, pid_auxv),
 	INF("status",     S_IRUGO, pid_status),
+	INF("sched",      S_IRUGO, pid_sched),
 	INF("cmdline",    S_IRUGO, pid_cmdline),
 	INF("stat",       S_IRUGO, tgid_stat),
 	INF("statm",      S_IRUGO, pid_statm),
@@ -2121,6 +2122,7 @@ static struct pid_entry tid_base_stuff[]
 	INF("environ",   S_IRUSR, pid_environ),
 	INF("auxv",      S_IRUSR, pid_auxv),
 	INF("status",    S_IRUGO, pid_status),
+	INF("sched",     S_IRUGO, pid_sched),
 	INF("cmdline",   S_IRUGO, pid_cmdline),
 	INF("stat",      S_IRUGO, tid_stat),
 	INF("statm",     S_IRUGO, pid_statm),
Index: linux-cfs-2.6.20.8.q/fs/proc/internal.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/fs/proc/internal.h
+++ linux-cfs-2.6.20.8.q/fs/proc/internal.h
@@ -36,6 +36,7 @@ extern int proc_exe_link(struct inode *,
 extern int proc_tid_stat(struct task_struct *,  char *);
 extern int proc_tgid_stat(struct task_struct *, char *);
 extern int proc_pid_status(struct task_struct *, char *);
+extern int proc_pid_sched(struct task_struct *, char *);
 extern int proc_pid_statm(struct task_struct *, char *);
 
 extern struct file_operations proc_maps_operations;
Index: linux-cfs-2.6.20.8.q/include/asm-generic/bitops/sched.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/asm-generic/bitops/sched.h
+++ linux-cfs-2.6.20.8.q/include/asm-generic/bitops/sched.h
@@ -6,28 +6,23 @@
 
 /*
  * Every architecture must define this function. It's the fastest
- * way of searching a 140-bit bitmap where the first 100 bits are
- * unlikely to be set. It's guaranteed that at least one of the 140
- * bits is cleared.
+ * way of searching a 100-bit bitmap.  It's guaranteed that at least
+ * one of the 100 bits is cleared.
  */
 static inline int sched_find_first_bit(const unsigned long *b)
 {
 #if BITS_PER_LONG == 64
-	if (unlikely(b[0]))
+	if (b[0])
 		return __ffs(b[0]);
-	if (likely(b[1]))
-		return __ffs(b[1]) + 64;
-	return __ffs(b[2]) + 128;
+	return __ffs(b[1]) + 64;
 #elif BITS_PER_LONG == 32
-	if (unlikely(b[0]))
+	if (b[0])
 		return __ffs(b[0]);
-	if (unlikely(b[1]))
+	if (b[1])
 		return __ffs(b[1]) + 32;
-	if (unlikely(b[2]))
+	if (b[2])
 		return __ffs(b[2]) + 64;
-	if (b[3])
-		return __ffs(b[3]) + 96;
-	return __ffs(b[4]) + 128;
+	return __ffs(b[3]) + 96;
 #else
 #error BITS_PER_LONG not defined
 #endif
Index: linux-cfs-2.6.20.8.q/include/asm-i386/topology.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/asm-i386/topology.h
+++ linux-cfs-2.6.20.8.q/include/asm-i386/topology.h
@@ -85,7 +85,6 @@ static inline int node_to_first_cpu(int 
 	.idle_idx		= 1,			\
 	.newidle_idx		= 2,			\
 	.wake_idx		= 1,			\
-	.per_cpu_gain		= 100,			\
 	.flags			= SD_LOAD_BALANCE	\
 				| SD_BALANCE_EXEC	\
 				| SD_BALANCE_FORK	\
Index: linux-cfs-2.6.20.8.q/include/asm-i386/unistd.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/asm-i386/unistd.h
+++ linux-cfs-2.6.20.8.q/include/asm-i386/unistd.h
@@ -325,10 +325,11 @@
 #define __NR_move_pages		317
 #define __NR_getcpu		318
 #define __NR_epoll_pwait	319
+#define __NR_sched_yield_to	320
 
 #ifdef __KERNEL__
 
-#define NR_syscalls 320
+#define NR_syscalls 321
 
 #define __ARCH_WANT_IPC_PARSE_VERSION
 #define __ARCH_WANT_OLD_READDIR
Index: linux-cfs-2.6.20.8.q/include/asm-ia64/topology.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/asm-ia64/topology.h
+++ linux-cfs-2.6.20.8.q/include/asm-ia64/topology.h
@@ -65,7 +65,6 @@ void build_cpu_to_node_map(void);
 	.max_interval		= 4,			\
 	.busy_factor		= 64,			\
 	.imbalance_pct		= 125,			\
-	.per_cpu_gain		= 100,			\
 	.cache_nice_tries	= 2,			\
 	.busy_idx		= 2,			\
 	.idle_idx		= 1,			\
@@ -97,7 +96,6 @@ void build_cpu_to_node_map(void);
 	.newidle_idx		= 0, /* unused */	\
 	.wake_idx		= 1,			\
 	.forkexec_idx		= 1,			\
-	.per_cpu_gain		= 100,			\
 	.flags			= SD_LOAD_BALANCE	\
 				| SD_BALANCE_EXEC	\
 				| SD_BALANCE_FORK	\
Index: linux-cfs-2.6.20.8.q/include/asm-mips/mach-ip27/topology.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/asm-mips/mach-ip27/topology.h
+++ linux-cfs-2.6.20.8.q/include/asm-mips/mach-ip27/topology.h
@@ -28,7 +28,6 @@ extern unsigned char __node_distances[MA
 	.busy_factor		= 32,			\
 	.imbalance_pct		= 125,			\
 	.cache_nice_tries	= 1,			\
-	.per_cpu_gain		= 100,			\
 	.flags			= SD_LOAD_BALANCE	\
 				| SD_BALANCE_EXEC	\
 				| SD_WAKE_BALANCE,	\
Index: linux-cfs-2.6.20.8.q/include/asm-powerpc/topology.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/asm-powerpc/topology.h
+++ linux-cfs-2.6.20.8.q/include/asm-powerpc/topology.h
@@ -57,7 +57,6 @@ static inline int pcibus_to_node(struct 
 	.busy_factor		= 32,			\
 	.imbalance_pct		= 125,			\
 	.cache_nice_tries	= 1,			\
-	.per_cpu_gain		= 100,			\
 	.busy_idx		= 3,			\
 	.idle_idx		= 1,			\
 	.newidle_idx		= 2,			\
Index: linux-cfs-2.6.20.8.q/include/asm-x86_64/topology.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/asm-x86_64/topology.h
+++ linux-cfs-2.6.20.8.q/include/asm-x86_64/topology.h
@@ -43,7 +43,6 @@ extern int __node_distance(int, int);
 	.newidle_idx		= 0, 			\
 	.wake_idx		= 1,			\
 	.forkexec_idx		= 1,			\
-	.per_cpu_gain		= 100,			\
 	.flags			= SD_LOAD_BALANCE	\
 				| SD_BALANCE_FORK	\
 				| SD_BALANCE_EXEC	\
Index: linux-cfs-2.6.20.8.q/include/asm-x86_64/unistd.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/asm-x86_64/unistd.h
+++ linux-cfs-2.6.20.8.q/include/asm-x86_64/unistd.h
@@ -619,8 +619,10 @@ __SYSCALL(__NR_sync_file_range, sys_sync
 __SYSCALL(__NR_vmsplice, sys_vmsplice)
 #define __NR_move_pages		279
 __SYSCALL(__NR_move_pages, sys_move_pages)
+#define __NR_sched_yield_to	280
+__SYSCALL(__NR_sched_yield_to, sys_sched_yield_to)
 
-#define __NR_syscall_max __NR_move_pages
+#define __NR_syscall_max __NR_sched_yield_to
 
 #ifndef __NO_STUBS
 #define __ARCH_WANT_OLD_READDIR
Index: linux-cfs-2.6.20.8.q/include/linux/hardirq.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/linux/hardirq.h
+++ linux-cfs-2.6.20.8.q/include/linux/hardirq.h
@@ -79,6 +79,19 @@
 #endif
 
 #ifdef CONFIG_PREEMPT
+# define PREEMPT_CHECK_OFFSET 1
+#else
+# define PREEMPT_CHECK_OFFSET 0
+#endif
+
+/*
+ * Check whether we were atomic before we did preempt_disable():
+ * (used by the scheduler)
+ */
+#define in_atomic_preempt_off() \
+		((preempt_count() & ~PREEMPT_ACTIVE) != PREEMPT_CHECK_OFFSET)
+
+#ifdef CONFIG_PREEMPT
 # define preemptible()	(preempt_count() == 0 && !irqs_disabled())
 # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
 #else
Index: linux-cfs-2.6.20.8.q/include/linux/ktime.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/linux/ktime.h
+++ linux-cfs-2.6.20.8.q/include/linux/ktime.h
@@ -274,4 +274,6 @@ extern void ktime_get_ts(struct timespec
 /* Get the real (wall-) time in timespec format: */
 #define ktime_get_real_ts(ts)	getnstimeofday(ts)
 
+extern ktime_t ktime_get(void);
+
 #endif
Index: linux-cfs-2.6.20.8.q/include/linux/sched.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/linux/sched.h
+++ linux-cfs-2.6.20.8.q/include/linux/sched.h
@@ -2,7 +2,6 @@
 #define _LINUX_SCHED_H
 
 #include <linux/auxvec.h>	/* For AT_VECTOR_SIZE */
-
 /*
  * cloning flags:
  */
@@ -37,6 +36,8 @@
 
 #ifdef __KERNEL__
 
+#include <linux/rbtree.h>	/* For run_node */
+
 struct sched_param {
 	int sched_priority;
 };
@@ -196,13 +197,13 @@ extern void init_idle(struct task_struct
 extern cpumask_t nohz_cpu_mask;
 
 /*
- * Only dump TASK_* tasks. (-1 for all tasks)
+ * Only dump TASK_* tasks. (0 for all tasks)
  */
 extern void show_state_filter(unsigned long state_filter);
 
 static inline void show_state(void)
 {
-	show_state_filter(-1);
+	show_state_filter(0);
 }
 
 extern void show_regs(struct pt_regs *);
@@ -464,7 +465,7 @@ struct signal_struct {
 	 * from jiffies_to_ns(utime + stime) if sched_clock uses something
 	 * other than jiffies.)
 	 */
-	unsigned long long sched_time;
+	unsigned long long sum_sched_runtime;
 
 	/*
 	 * We don't bother to synchronize most readers of this at all,
@@ -524,6 +525,7 @@ struct signal_struct {
 #define MAX_RT_PRIO		MAX_USER_RT_PRIO
 
 #define MAX_PRIO		(MAX_RT_PRIO + 40)
+#define DEFAULT_PRIO		(MAX_RT_PRIO + 20)
 
 #define rt_prio(prio)		unlikely((prio) < MAX_RT_PRIO)
 #define rt_task(p)		rt_prio((p)->prio)
@@ -635,7 +637,14 @@ enum idle_type
 /*
  * sched-domains (multiprocessor balancing) declarations:
  */
-#define SCHED_LOAD_SCALE	128UL	/* increase resolution of load */
+
+/*
+ * Increase resolution of nice-level calculations:
+ */
+#define SCHED_LOAD_SHIFT	10
+#define SCHED_LOAD_SCALE	(1UL << SCHED_LOAD_SHIFT)
+
+#define SCHED_LOAD_SCALE_FUZZ	(SCHED_LOAD_SCALE >> 5)
 
 #ifdef CONFIG_SMP
 #define SD_LOAD_BALANCE		1	/* Do load balancing on this domain. */
@@ -684,7 +693,6 @@ struct sched_domain {
 	unsigned int imbalance_pct;	/* No balance until over watermark */
 	unsigned long long cache_hot_time; /* Task considered cache hot (ns) */
 	unsigned int cache_nice_tries;	/* Leave cache hot tasks for # tries */
-	unsigned int per_cpu_gain;	/* CPU % gained by adding domain cpus */
 	unsigned int busy_idx;
 	unsigned int idle_idx;
 	unsigned int newidle_idx;
@@ -733,12 +741,6 @@ struct sched_domain {
 extern int partition_sched_domains(cpumask_t *partition1,
 				    cpumask_t *partition2);
 
-/*
- * Maximum cache size the migration-costs auto-tuning code will
- * search from:
- */
-extern unsigned int max_cache_size;
-
 #endif	/* CONFIG_SMP */
 
 
@@ -789,14 +791,28 @@ struct mempolicy;
 struct pipe_inode_info;
 struct uts_namespace;
 
-enum sleep_type {
-	SLEEP_NORMAL,
-	SLEEP_NONINTERACTIVE,
-	SLEEP_INTERACTIVE,
-	SLEEP_INTERRUPTED,
-};
+struct rq;
 
-struct prio_array;
+struct sched_class {
+	struct sched_class *next;
+
+	void (*enqueue_task) (struct rq *rq, struct task_struct *p,
+			      int wakeup, u64 now);
+	void (*dequeue_task) (struct rq *rq, struct task_struct *p,
+			      int sleep, u64 now);
+	void (*yield_task) (struct rq *rq, struct task_struct *p,
+			    struct task_struct *p_to);
+
+	void (*check_preempt_curr) (struct rq *rq, struct task_struct *p);
+
+	struct task_struct * (*pick_next_task) (struct rq *rq, u64 now);
+	void (*put_prev_task) (struct rq *rq, struct task_struct *p, u64 now);
+
+	struct task_struct * (*load_balance_start) (struct rq *rq);
+	struct task_struct * (*load_balance_next) (struct rq *rq);
+	void (*task_tick) (struct rq *rq, struct task_struct *p);
+	void (*task_new) (struct rq *rq, struct task_struct *p);
+};
 
 struct task_struct {
 	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
@@ -813,26 +829,45 @@ struct task_struct {
 #endif
 #endif
 	int load_weight;	/* for niceness load balancing purposes */
+	int load_shift;
+
 	int prio, static_prio, normal_prio;
+	int on_rq;
 	struct list_head run_list;
-	struct prio_array *array;
+	struct rb_node run_node;
 
 	unsigned short ioprio;
 #ifdef CONFIG_BLK_DEV_IO_TRACE
 	unsigned int btrace_seq;
 #endif
-	unsigned long sleep_avg;
-	unsigned long long timestamp, last_ran;
-	unsigned long long sched_time; /* sched_clock time spent running */
-	enum sleep_type sleep_type;
+	/* CFS scheduling class statistics fields: */
+	u64 wait_start_fair;
+	u64 wait_start;
+	u64 exec_start;
+	u64 sleep_start;
+	u64 block_start;
+	u64 sleep_max;
+	u64 block_max;
+	u64 exec_max;
+	u64 wait_max;
+	u64 last_ran;
+
+	s64 wait_runtime;
+	u64 sum_exec_runtime;
+	s64 fair_key;
+	s64 sum_wait_runtime;
 
 	unsigned long policy;
 	cpumask_t cpus_allowed;
-	unsigned int time_slice, first_time_slice;
+	unsigned int time_slice;
+	struct sched_class *sched_class;
+
+	s64 min_wait_runtime;
 
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
 	struct sched_info sched_info;
 #endif
+	u64 nr_switches;
 
 	struct list_head tasks;
 	/*
@@ -1195,8 +1230,9 @@ static inline int set_cpus_allowed(struc
 #endif
 
 extern unsigned long long sched_clock(void);
+extern void sched_clock_unstable_event(void);
 extern unsigned long long
-current_sched_time(const struct task_struct *current_task);
+current_sched_runtime(const struct task_struct *current_task);
 
 /* sched_exec is called by processes performing an exec */
 #ifdef CONFIG_SMP
@@ -1212,6 +1248,13 @@ static inline void idle_task_exit(void) 
 #endif
 
 extern void sched_idle_next(void);
+extern char * sched_print_task_state(struct task_struct *p, char *buffer);
+
+extern unsigned int sysctl_sched_granularity;
+extern unsigned int sysctl_sched_wakeup_granularity;
+extern unsigned int sysctl_sched_sleep_history_max;
+extern unsigned int sysctl_sched_child_runs_first;
+extern unsigned int sysctl_sched_load_smoothing;
 
 #ifdef CONFIG_RT_MUTEXES
 extern int rt_mutex_getprio(struct task_struct *p);
@@ -1290,8 +1333,7 @@ extern void FASTCALL(wake_up_new_task(st
 #else
  static inline void kick_process(struct task_struct *tsk) { }
 #endif
-extern void FASTCALL(sched_fork(struct task_struct * p, int clone_flags));
-extern void FASTCALL(sched_exit(struct task_struct * p));
+extern void sched_fork(struct task_struct * p, int clone_flags);
 
 extern int in_group_p(gid_t);
 extern int in_egroup_p(gid_t);
Index: linux-cfs-2.6.20.8.q/include/linux/topology.h
===================================================================
--- linux-cfs-2.6.20.8.q.orig/include/linux/topology.h
+++ linux-cfs-2.6.20.8.q/include/linux/topology.h
@@ -96,7 +96,6 @@
 	.busy_factor		= 64,			\
 	.imbalance_pct		= 110,			\
 	.cache_nice_tries	= 0,			\
-	.per_cpu_gain		= 25,			\
 	.busy_idx		= 0,			\
 	.idle_idx		= 0,			\
 	.newidle_idx		= 1,			\
@@ -128,7 +127,6 @@
 	.busy_factor		= 64,			\
 	.imbalance_pct		= 125,			\
 	.cache_nice_tries	= 1,			\
-	.per_cpu_gain		= 100,			\
 	.busy_idx		= 2,			\
 	.idle_idx		= 1,			\
 	.newidle_idx		= 2,			\
@@ -159,7 +157,6 @@
 	.busy_factor		= 64,			\
 	.imbalance_pct		= 125,			\
 	.cache_nice_tries	= 1,			\
-	.per_cpu_gain		= 100,			\
 	.busy_idx		= 2,			\
 	.idle_idx		= 1,			\
 	.newidle_idx		= 2,			\
@@ -193,7 +190,6 @@
 	.newidle_idx		= 0, /* unused */	\
 	.wake_idx		= 0, /* unused */	\
 	.forkexec_idx		= 0, /* unused */	\
-	.per_cpu_gain		= 100,			\
 	.flags			= SD_LOAD_BALANCE	\
 				| SD_SERIALIZE,	\
 	.last_balance		= jiffies,		\
Index: linux-cfs-2.6.20.8.q/init/main.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/init/main.c
+++ linux-cfs-2.6.20.8.q/init/main.c
@@ -422,7 +422,7 @@ static void noinline rest_init(void)
 
 	/*
 	 * The boot idle thread must execute schedule()
-	 * at least one to get things moving:
+	 * at least once to get things moving:
 	 */
 	preempt_enable_no_resched();
 	schedule();
Index: linux-cfs-2.6.20.8.q/kernel/exit.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/kernel/exit.c
+++ linux-cfs-2.6.20.8.q/kernel/exit.c
@@ -112,7 +112,7 @@ static void __exit_signal(struct task_st
 		sig->maj_flt += tsk->maj_flt;
 		sig->nvcsw += tsk->nvcsw;
 		sig->nivcsw += tsk->nivcsw;
-		sig->sched_time += tsk->sched_time;
+		sig->sum_sched_runtime += tsk->sum_exec_runtime;
 		sig = NULL; /* Marker for below. */
 	}
 
@@ -170,7 +170,6 @@ repeat:
 		zap_leader = (leader->exit_signal == -1);
 	}
 
-	sched_exit(p);
 	write_unlock_irq(&tasklist_lock);
 	proc_flush_task(p);
 	release_thread(p);
Index: linux-cfs-2.6.20.8.q/kernel/fork.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/kernel/fork.c
+++ linux-cfs-2.6.20.8.q/kernel/fork.c
@@ -874,7 +874,7 @@ static inline int copy_signal(unsigned l
 	sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
 	sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0;
 	sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0;
-	sig->sched_time = 0;
+	sig->sum_sched_runtime = 0;
 	INIT_LIST_HEAD(&sig->cpu_timers[0]);
 	INIT_LIST_HEAD(&sig->cpu_timers[1]);
 	INIT_LIST_HEAD(&sig->cpu_timers[2]);
@@ -1037,7 +1037,7 @@ static struct task_struct *copy_process(
 
 	p->utime = cputime_zero;
 	p->stime = cputime_zero;
- 	p->sched_time = 0;
+
 	p->rchar = 0;		/* I/O counter: bytes read */
 	p->wchar = 0;		/* I/O counter: bytes written */
 	p->syscr = 0;		/* I/O counter: read syscalls */
Index: linux-cfs-2.6.20.8.q/kernel/hrtimer.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/kernel/hrtimer.c
+++ linux-cfs-2.6.20.8.q/kernel/hrtimer.c
@@ -45,7 +45,7 @@
  *
  * returns the time in ktime_t format
  */
-static ktime_t ktime_get(void)
+ktime_t ktime_get(void)
 {
 	struct timespec now;
 
Index: linux-cfs-2.6.20.8.q/kernel/posix-cpu-timers.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/kernel/posix-cpu-timers.c
+++ linux-cfs-2.6.20.8.q/kernel/posix-cpu-timers.c
@@ -161,7 +161,7 @@ static inline cputime_t virt_ticks(struc
 }
 static inline unsigned long long sched_ns(struct task_struct *p)
 {
-	return (p == current) ? current_sched_time(p) : p->sched_time;
+	return (p == current) ? current_sched_runtime(p) : p->sum_exec_runtime;
 }
 
 int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp)
@@ -246,10 +246,10 @@ static int cpu_clock_sample_group_locked
 		} while (t != p);
 		break;
 	case CPUCLOCK_SCHED:
-		cpu->sched = p->signal->sched_time;
+		cpu->sched = p->signal->sum_sched_runtime;
 		/* Add in each other live thread.  */
 		while ((t = next_thread(t)) != p) {
-			cpu->sched += t->sched_time;
+			cpu->sched += t->sum_exec_runtime;
 		}
 		cpu->sched += sched_ns(p);
 		break;
@@ -417,7 +417,7 @@ int posix_cpu_timer_del(struct k_itimer 
  */
 static void cleanup_timers(struct list_head *head,
 			   cputime_t utime, cputime_t stime,
-			   unsigned long long sched_time)
+			   unsigned long long sum_exec_runtime)
 {
 	struct cpu_timer_list *timer, *next;
 	cputime_t ptime = cputime_add(utime, stime);
@@ -446,10 +446,10 @@ static void cleanup_timers(struct list_h
 	++head;
 	list_for_each_entry_safe(timer, next, head, entry) {
 		list_del_init(&timer->entry);
-		if (timer->expires.sched < sched_time) {
+		if (timer->expires.sched < sum_exec_runtime) {
 			timer->expires.sched = 0;
 		} else {
-			timer->expires.sched -= sched_time;
+			timer->expires.sched -= sum_exec_runtime;
 		}
 	}
 }
@@ -462,7 +462,7 @@ static void cleanup_timers(struct list_h
 void posix_cpu_timers_exit(struct task_struct *tsk)
 {
 	cleanup_timers(tsk->cpu_timers,
-		       tsk->utime, tsk->stime, tsk->sched_time);
+		       tsk->utime, tsk->stime, tsk->sum_exec_runtime);
 
 }
 void posix_cpu_timers_exit_group(struct task_struct *tsk)
@@ -470,7 +470,7 @@ void posix_cpu_timers_exit_group(struct 
 	cleanup_timers(tsk->signal->cpu_timers,
 		       cputime_add(tsk->utime, tsk->signal->utime),
 		       cputime_add(tsk->stime, tsk->signal->stime),
-		       tsk->sched_time + tsk->signal->sched_time);
+		       tsk->sum_exec_runtime + tsk->signal->sum_sched_runtime);
 }
 
 
@@ -531,7 +531,7 @@ static void process_timer_rebalance(stru
 		nsleft = max_t(unsigned long long, nsleft, 1);
 		do {
 			if (likely(!(t->flags & PF_EXITING))) {
-				ns = t->sched_time + nsleft;
+				ns = t->sum_exec_runtime + nsleft;
 				if (t->it_sched_expires == 0 ||
 				    t->it_sched_expires > ns) {
 					t->it_sched_expires = ns;
@@ -999,7 +999,7 @@ static void check_thread_timers(struct t
 		struct cpu_timer_list *t = list_entry(timers->next,
 						      struct cpu_timer_list,
 						      entry);
-		if (!--maxfire || tsk->sched_time < t->expires.sched) {
+		if (!--maxfire || tsk->sum_exec_runtime < t->expires.sched) {
 			tsk->it_sched_expires = t->expires.sched;
 			break;
 		}
@@ -1019,7 +1019,7 @@ static void check_process_timers(struct 
 	int maxfire;
 	struct signal_struct *const sig = tsk->signal;
 	cputime_t utime, stime, ptime, virt_expires, prof_expires;
-	unsigned long long sched_time, sched_expires;
+	unsigned long long sum_sched_runtime, sched_expires;
 	struct task_struct *t;
 	struct list_head *timers = sig->cpu_timers;
 
@@ -1039,12 +1039,12 @@ static void check_process_timers(struct 
 	 */
 	utime = sig->utime;
 	stime = sig->stime;
-	sched_time = sig->sched_time;
+	sum_sched_runtime = sig->sum_sched_runtime;
 	t = tsk;
 	do {
 		utime = cputime_add(utime, t->utime);
 		stime = cputime_add(stime, t->stime);
-		sched_time += t->sched_time;
+		sum_sched_runtime += t->sum_exec_runtime;
 		t = next_thread(t);
 	} while (t != tsk);
 	ptime = cputime_add(utime, stime);
@@ -1085,7 +1085,7 @@ static void check_process_timers(struct 
 		struct cpu_timer_list *t = list_entry(timers->next,
 						      struct cpu_timer_list,
 						      entry);
-		if (!--maxfire || sched_time < t->expires.sched) {
+		if (!--maxfire || sum_sched_runtime < t->expires.sched) {
 			sched_expires = t->expires.sched;
 			break;
 		}
@@ -1177,7 +1177,7 @@ static void check_process_timers(struct 
 		virt_left = cputime_sub(virt_expires, utime);
 		virt_left = cputime_div_non_zero(virt_left, nthreads);
 		if (sched_expires) {
-			sched_left = sched_expires - sched_time;
+			sched_left = sched_expires - sum_sched_runtime;
 			do_div(sched_left, nthreads);
 			sched_left = max_t(unsigned long long, sched_left, 1);
 		} else {
@@ -1203,7 +1203,7 @@ static void check_process_timers(struct 
 				t->it_virt_expires = ticks;
 			}
 
-			sched = t->sched_time + sched_left;
+			sched = t->sum_exec_runtime + sched_left;
 			if (sched_expires && (t->it_sched_expires == 0 ||
 					      t->it_sched_expires > sched)) {
 				t->it_sched_expires = sched;
@@ -1295,7 +1295,7 @@ void run_posix_cpu_timers(struct task_st
 
 	if (UNEXPIRED(prof) && UNEXPIRED(virt) &&
 	    (tsk->it_sched_expires == 0 ||
-	     tsk->sched_time < tsk->it_sched_expires))
+	     tsk->sum_exec_runtime < tsk->it_sched_expires))
 		return;
 
 #undef	UNEXPIRED
Index: linux-cfs-2.6.20.8.q/kernel/sched.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/kernel/sched.c
+++ linux-cfs-2.6.20.8.q/kernel/sched.c
@@ -89,110 +89,13 @@
  */
 #define MIN_TIMESLICE		max(5 * HZ / 1000, 1)
 #define DEF_TIMESLICE		(100 * HZ / 1000)
-#define ON_RUNQUEUE_WEIGHT	 30
-#define CHILD_PENALTY		 95
-#define PARENT_PENALTY		100
-#define EXIT_WEIGHT		  3
-#define PRIO_BONUS_RATIO	 25
-#define MAX_BONUS		(MAX_USER_PRIO * PRIO_BONUS_RATIO / 100)
-#define INTERACTIVE_DELTA	  2
-#define MAX_SLEEP_AVG		(DEF_TIMESLICE * MAX_BONUS)
-#define STARVATION_LIMIT	(MAX_SLEEP_AVG)
-#define NS_MAX_SLEEP_AVG	(JIFFIES_TO_NS(MAX_SLEEP_AVG))
-
-/*
- * If a task is 'interactive' then we reinsert it in the active
- * array after it has expired its current timeslice. (it will not
- * continue to run immediately, it will still roundrobin with
- * other interactive tasks.)
- *
- * This part scales the interactivity limit depending on niceness.
- *
- * We scale it linearly, offset by the INTERACTIVE_DELTA delta.
- * Here are a few examples of different nice levels:
- *
- *  TASK_INTERACTIVE(-20): [1,1,1,1,1,1,1,1,1,0,0]
- *  TASK_INTERACTIVE(-10): [1,1,1,1,1,1,1,0,0,0,0]
- *  TASK_INTERACTIVE(  0): [1,1,1,1,0,0,0,0,0,0,0]
- *  TASK_INTERACTIVE( 10): [1,1,0,0,0,0,0,0,0,0,0]
- *  TASK_INTERACTIVE( 19): [0,0,0,0,0,0,0,0,0,0,0]
- *
- * (the X axis represents the possible -5 ... 0 ... +5 dynamic
- *  priority range a task can explore, a value of '1' means the
- *  task is rated interactive.)
- *
- * Ie. nice +19 tasks can never get 'interactive' enough to be
- * reinserted into the active array. And only heavily CPU-hog nice -20
- * tasks will be expired. Default nice 0 tasks are somewhere between,
- * it takes some effort for them to get interactive, but it's not
- * too hard.
- */
-
-#define CURRENT_BONUS(p) \
-	(NS_TO_JIFFIES((p)->sleep_avg) * MAX_BONUS / \
-		MAX_SLEEP_AVG)
-
-#define GRANULARITY	(10 * HZ / 1000 ? : 1)
-
-#ifdef CONFIG_SMP
-#define TIMESLICE_GRANULARITY(p)	(GRANULARITY * \
-		(1 << (((MAX_BONUS - CURRENT_BONUS(p)) ? : 1) - 1)) * \
-			num_online_cpus())
-#else
-#define TIMESLICE_GRANULARITY(p)	(GRANULARITY * \
-		(1 << (((MAX_BONUS - CURRENT_BONUS(p)) ? : 1) - 1)))
-#endif
-
-#define SCALE(v1,v1_max,v2_max) \
-	(v1) * (v2_max) / (v1_max)
-
-#define DELTA(p) \
-	(SCALE(TASK_NICE(p) + 20, 40, MAX_BONUS) - 20 * MAX_BONUS / 40 + \
-		INTERACTIVE_DELTA)
-
-#define TASK_INTERACTIVE(p) \
-	((p)->prio <= (p)->static_prio - DELTA(p))
-
-#define INTERACTIVE_SLEEP(p) \
-	(JIFFIES_TO_NS(MAX_SLEEP_AVG * \
-		(MAX_BONUS / 2 + DELTA((p)) + 1) / MAX_BONUS - 1))
-
-#define TASK_PREEMPTS_CURR(p, rq) \
-	((p)->prio < (rq)->curr->prio)
-
-#define SCALE_PRIO(x, prio) \
-	max(x * (MAX_PRIO - prio) / (MAX_USER_PRIO / 2), MIN_TIMESLICE)
-
-static unsigned int static_prio_timeslice(int static_prio)
-{
-	if (static_prio < NICE_TO_PRIO(0))
-		return SCALE_PRIO(DEF_TIMESLICE * 4, static_prio);
-	else
-		return SCALE_PRIO(DEF_TIMESLICE, static_prio);
-}
-
-/*
- * task_timeslice() scales user-nice values [ -20 ... 0 ... 19 ]
- * to time slice values: [800ms ... 100ms ... 5ms]
- *
- * The higher a thread's priority, the bigger timeslices
- * it gets during one round of execution. But even the lowest
- * priority thread gets MIN_TIMESLICE worth of execution time.
- */
-
-static inline unsigned int task_timeslice(struct task_struct *p)
-{
-	return static_prio_timeslice(p->static_prio);
-}
 
 /*
- * These are the runqueue data structures:
+ * This is the priority-queue data structure of the RT scheduling class:
  */
-
 struct prio_array {
-	unsigned int nr_active;
-	DECLARE_BITMAP(bitmap, MAX_PRIO+1); /* include 1 bit for delimiter */
-	struct list_head queue[MAX_PRIO];
+	DECLARE_BITMAP(bitmap, MAX_RT_PRIO+1); /* include 1 bit for delimiter */
+	struct list_head queue[MAX_RT_PRIO];
 };
 
 /*
@@ -209,12 +112,13 @@ struct rq {
 	 * nr_running and cpu_load should be in the same cacheline because
 	 * remote CPUs use both these fields when doing load calculation.
 	 */
-	unsigned long nr_running;
+	long nr_running;
 	unsigned long raw_weighted_load;
-#ifdef CONFIG_SMP
-	unsigned long cpu_load[3];
-#endif
-	unsigned long long nr_switches;
+	#define CPU_LOAD_IDX_MAX 5
+	unsigned long cpu_load[CPU_LOAD_IDX_MAX];
+
+	u64 nr_switches;
+	unsigned long nr_load_updates;
 
 	/*
 	 * This is part of a global counter where only the total sum
@@ -224,14 +128,29 @@ struct rq {
 	 */
 	unsigned long nr_uninterruptible;
 
-	unsigned long expired_timestamp;
-	/* Cached timestamp set by update_cpu_clock() */
-	unsigned long long most_recent_timestamp;
 	struct task_struct *curr, *idle;
 	unsigned long next_balance;
 	struct mm_struct *prev_mm;
-	struct prio_array *active, *expired, arrays[2];
-	int best_expired_prio;
+
+	u64 clock, prev_clock_raw;
+	s64 clock_max_delta;
+	u64 fair_clock, prev_fair_clock;
+	u64 exec_clock, prev_exec_clock;
+	u64 wait_runtime;
+
+	unsigned int clock_warps;
+	unsigned int clock_unstable_events;
+
+	struct sched_class *load_balance_class;
+
+	struct prio_array active;
+	int rt_load_balance_idx;
+	struct list_head *rt_load_balance_head, *rt_load_balance_curr;
+
+	struct rb_root tasks_timeline;
+	struct rb_node *rb_leftmost;
+	struct rb_node *rb_load_balance_curr;
+
 	atomic_t nr_iowait;
 
 #ifdef CONFIG_SMP
@@ -268,7 +187,107 @@ struct rq {
 	struct lock_class_key rq_lock_key;
 };
 
-static DEFINE_PER_CPU(struct rq, runqueues);
+static DEFINE_PER_CPU(struct rq, runqueues) ____cacheline_aligned_in_smp;
+
+static inline void check_preempt_curr(struct rq *rq, struct task_struct *p)
+{
+	rq->curr->sched_class->check_preempt_curr(rq, p);
+}
+
+#define SCALE_PRIO(x, prio) \
+	max(x * (MAX_PRIO - prio) / (MAX_USER_PRIO / 2), MIN_TIMESLICE)
+
+/*
+ * static_prio_timeslice() scales user-nice values [ -20 ... 0 ... 19 ]
+ * to time slice values: [800ms ... 100ms ... 5ms]
+ */
+static unsigned int static_prio_timeslice(int static_prio)
+{
+	if (static_prio == NICE_TO_PRIO(19))
+		return 1;
+
+	if (static_prio < NICE_TO_PRIO(0))
+		return SCALE_PRIO(DEF_TIMESLICE * 4, static_prio);
+	else
+		return SCALE_PRIO(DEF_TIMESLICE, static_prio);
+}
+
+/*
+ * Print out various scheduling related per-task fields:
+ */
+char * sched_print_task_state(struct task_struct *p, char *buffer)
+{
+	struct rq *this_rq = &per_cpu(runqueues, raw_smp_processor_id());
+	unsigned long long t0, t1;
+
+#define P(F) \
+	buffer += sprintf(buffer, "%-25s:%20Ld\n", #F, (long long)p->F)
+
+	P(wait_start);
+	P(wait_start_fair);
+	P(exec_start);
+	P(sleep_start);
+	P(block_start);
+	P(sleep_max);
+	P(block_max);
+	P(exec_max);
+	P(wait_max);
+	P(min_wait_runtime);
+	P(last_ran);
+	P(wait_runtime);
+	P(sum_exec_runtime);
+#undef P
+
+	t0 = sched_clock();
+	t1 = sched_clock();
+	buffer += sprintf(buffer, "%-25s:%20Ld\n", "clock-delta",
+				(long long)t1-t0);
+	buffer += sprintf(buffer, "%-25s:%20Ld\n", "rq-wait_runtime",
+				(long long)this_rq->wait_runtime);
+	buffer += sprintf(buffer, "%-25s:%20Ld\n", "rq-exec_clock",
+				(long long)this_rq->exec_clock);
+	buffer += sprintf(buffer, "%-25s:%20Ld\n", "rq-fair_clock",
+				(long long)this_rq->fair_clock);
+	buffer += sprintf(buffer, "%-25s:%20Ld\n", "rq-clock",
+				(long long)this_rq->clock);
+	buffer += sprintf(buffer, "%-25s:%20Ld\n", "rq-prev_clock_raw",
+				(long long)this_rq->prev_clock_raw);
+	buffer += sprintf(buffer, "%-25s:%20Ld\n", "rq-clock_max_delta",
+				(long long)this_rq->clock_max_delta);
+	buffer += sprintf(buffer, "%-25s:%20u\n", "rq-clock_warps",
+				this_rq->clock_warps);
+	buffer += sprintf(buffer, "%-25s:%20u\n", "rq-clock_unstable_events",
+				this_rq->clock_unstable_events);
+	return buffer;
+}
+
+/*
+ * Per-runqueue clock, as finegrained as the platform can give us:
+ */
+static inline unsigned long long __rq_clock(struct rq *rq)
+{
+	u64 now = sched_clock();
+	u64 clock = rq->clock;
+	u64 prev_raw = rq->prev_clock_raw;
+	s64 delta = now - prev_raw;
+
+	/*
+	 * Protect against sched_clock() occasionally going backwards:
+	 */
+	if (unlikely(delta < 0)) {
+		clock++;
+		rq->clock_warps++;
+	} else {
+		if (unlikely(delta > rq->clock_max_delta))
+			rq->clock_max_delta = delta;
+		clock += delta;
+	}
+
+	rq->prev_clock_raw = now;
+	rq->clock = clock;
+
+	return clock;
+}
 
 static inline int cpu_of(struct rq *rq)
 {
@@ -279,6 +298,16 @@ static inline int cpu_of(struct rq *rq)
 #endif
 }
 
+static inline unsigned long long rq_clock(struct rq *rq)
+{
+	int this_cpu = smp_processor_id();
+
+	if (this_cpu == cpu_of(rq))
+		return __rq_clock(rq);
+
+	return rq->clock;
+}
+
 /*
  * The domain tree (rq->sd) is protected by RCU's quiescent state transition.
  * See detach_destroy_domains: synchronize_sched for details.
@@ -423,134 +452,6 @@ static inline void task_rq_unlock(struct
 	spin_unlock_irqrestore(&rq->lock, *flags);
 }
 
-#ifdef CONFIG_SCHEDSTATS
-/*
- * bump this up when changing the output format or the meaning of an existing
- * format, so that tools can adapt (or abort)
- */
-#define SCHEDSTAT_VERSION 14
-
-static int show_schedstat(struct seq_file *seq, void *v)
-{
-	int cpu;
-
-	seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
-	seq_printf(seq, "timestamp %lu\n", jiffies);
-	for_each_online_cpu(cpu) {
-		struct rq *rq = cpu_rq(cpu);
-#ifdef CONFIG_SMP
-		struct sched_domain *sd;
-		int dcnt = 0;
-#endif
-
-		/* runqueue-specific stats */
-		seq_printf(seq,
-		    "cpu%d %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu",
-		    cpu, rq->yld_both_empty,
-		    rq->yld_act_empty, rq->yld_exp_empty, rq->yld_cnt,
-		    rq->sched_switch, rq->sched_cnt, rq->sched_goidle,
-		    rq->ttwu_cnt, rq->ttwu_local,
-		    rq->rq_sched_info.cpu_time,
-		    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcnt);
-
-		seq_printf(seq, "\n");
-
-#ifdef CONFIG_SMP
-		/* domain-specific stats */
-		preempt_disable();
-		for_each_domain(cpu, sd) {
-			enum idle_type itype;
-			char mask_str[NR_CPUS];
-
-			cpumask_scnprintf(mask_str, NR_CPUS, sd->span);
-			seq_printf(seq, "domain%d %s", dcnt++, mask_str);
-			for (itype = SCHED_IDLE; itype < MAX_IDLE_TYPES;
-					itype++) {
-				seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu "
-						"%lu",
-				    sd->lb_cnt[itype],
-				    sd->lb_balanced[itype],
-				    sd->lb_failed[itype],
-				    sd->lb_imbalance[itype],
-				    sd->lb_gained[itype],
-				    sd->lb_hot_gained[itype],
-				    sd->lb_nobusyq[itype],
-				    sd->lb_nobusyg[itype]);
-			}
-			seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu %lu %lu"
-			    " %lu %lu %lu\n",
-			    sd->alb_cnt, sd->alb_failed, sd->alb_pushed,
-			    sd->sbe_cnt, sd->sbe_balanced, sd->sbe_pushed,
-			    sd->sbf_cnt, sd->sbf_balanced, sd->sbf_pushed,
-			    sd->ttwu_wake_remote, sd->ttwu_move_affine,
-			    sd->ttwu_move_balance);
-		}
-		preempt_enable();
-#endif
-	}
-	return 0;
-}
-
-static int schedstat_open(struct inode *inode, struct file *file)
-{
-	unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
-	char *buf = kmalloc(size, GFP_KERNEL);
-	struct seq_file *m;
-	int res;
-
-	if (!buf)
-		return -ENOMEM;
-	res = single_open(file, show_schedstat, NULL);
-	if (!res) {
-		m = file->private_data;
-		m->buf = buf;
-		m->size = size;
-	} else
-		kfree(buf);
-	return res;
-}
-
-const struct file_operations proc_schedstat_operations = {
-	.open    = schedstat_open,
-	.read    = seq_read,
-	.llseek  = seq_lseek,
-	.release = single_release,
-};
-
-/*
- * Expects runqueue lock to be held for atomicity of update
- */
-static inline void
-rq_sched_info_arrive(struct rq *rq, unsigned long delta_jiffies)
-{
-	if (rq) {
-		rq->rq_sched_info.run_delay += delta_jiffies;
-		rq->rq_sched_info.pcnt++;
-	}
-}
-
-/*
- * Expects runqueue lock to be held for atomicity of update
- */
-static inline void
-rq_sched_info_depart(struct rq *rq, unsigned long delta_jiffies)
-{
-	if (rq)
-		rq->rq_sched_info.cpu_time += delta_jiffies;
-}
-# define schedstat_inc(rq, field)	do { (rq)->field++; } while (0)
-# define schedstat_add(rq, field, amt)	do { (rq)->field += (amt); } while (0)
-#else /* !CONFIG_SCHEDSTATS */
-static inline void
-rq_sched_info_arrive(struct rq *rq, unsigned long delta_jiffies)
-{}
-static inline void
-rq_sched_info_depart(struct rq *rq, unsigned long delta_jiffies)
-{}
-# define schedstat_inc(rq, field)	do { } while (0)
-# define schedstat_add(rq, field, amt)	do { } while (0)
-#endif
-
 /*
  * this_rq_lock - lock this runqueue and disable interrupts.
  */
@@ -566,178 +467,60 @@ static inline struct rq *this_rq_lock(vo
 	return rq;
 }
 
-#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
-/*
- * Called when a process is dequeued from the active array and given
- * the cpu.  We should note that with the exception of interactive
- * tasks, the expired queue will become the active queue after the active
- * queue is empty, without explicitly dequeuing and requeuing tasks in the
- * expired queue.  (Interactive tasks may be requeued directly to the
- * active queue, thus delaying tasks in the expired queue from running;
- * see scheduler_tick()).
- *
- * This function is only called from sched_info_arrive(), rather than
- * dequeue_task(). Even though a task may be queued and dequeued multiple
- * times as it is shuffled about, we're really interested in knowing how
- * long it was from the *first* time it was queued to the time that it
- * finally hit a cpu.
- */
-static inline void sched_info_dequeued(struct task_struct *t)
-{
-	t->sched_info.last_queued = 0;
-}
-
 /*
- * Called when a task finally hits the cpu.  We can now calculate how
- * long it was waiting to run.  We also note when it began so that we
- * can keep stats on how long its timeslice is.
+ * CPU frequency is/was unstable - start new by setting prev_clock_raw:
  */
-static void sched_info_arrive(struct task_struct *t)
+void sched_clock_unstable_event(void)
 {
-	unsigned long now = jiffies, delta_jiffies = 0;
-
-	if (t->sched_info.last_queued)
-		delta_jiffies = now - t->sched_info.last_queued;
-	sched_info_dequeued(t);
-	t->sched_info.run_delay += delta_jiffies;
-	t->sched_info.last_arrival = now;
-	t->sched_info.pcnt++;
+	unsigned long flags;
+	struct rq *rq;
 
-	rq_sched_info_arrive(task_rq(t), delta_jiffies);
+	rq = task_rq_lock(current, &flags);
+	rq->prev_clock_raw = sched_clock();
+	rq->clock_unstable_events++;
+	task_rq_unlock(rq, &flags);
 }
 
 /*
- * Called when a process is queued into either the active or expired
- * array.  The time is noted and later used to determine how long we
- * had to wait for us to reach the cpu.  Since the expired queue will
- * become the active queue after active queue is empty, without dequeuing
- * and requeuing any tasks, we are interested in queuing to either. It
- * is unusual but not impossible for tasks to be dequeued and immediately
- * requeued in the same or another array: this can happen in sched_yield(),
- * set_user_nice(), and even load_balance() as it moves tasks from runqueue
- * to runqueue.
+ * resched_task - mark a task 'to be rescheduled now'.
  *
- * This function is only called from enqueue_task(), but also only updates
- * the timestamp if it is already not set.  It's assumed that
- * sched_info_dequeued() will clear that stamp when appropriate.
- */
-static inline void sched_info_queued(struct task_struct *t)
-{
-	if (unlikely(sched_info_on()))
-		if (!t->sched_info.last_queued)
-			t->sched_info.last_queued = jiffies;
-}
-
-/*
- * Called when a process ceases being the active-running process, either
- * voluntarily or involuntarily.  Now we can calculate how long we ran.
+ * On UP this means the setting of the need_resched flag, on SMP it
+ * might also involve a cross-CPU call to trigger the scheduler on
+ * the target CPU.
  */
-static inline void sched_info_depart(struct task_struct *t)
-{
-	unsigned long delta_jiffies = jiffies - t->sched_info.last_arrival;
+#ifdef CONFIG_SMP
 
-	t->sched_info.cpu_time += delta_jiffies;
-	rq_sched_info_depart(task_rq(t), delta_jiffies);
-}
+#ifndef tsk_is_polling
+#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
+#endif
 
-/*
- * Called when tasks are switched involuntarily due, typically, to expiring
- * their time slice.  (This may also be called when switching to or from
- * the idle task.)  We are only called when prev != next.
- */
-static inline void
-__sched_info_switch(struct task_struct *prev, struct task_struct *next)
+static void resched_task(struct task_struct *p)
 {
-	struct rq *rq = task_rq(prev);
-
-	/*
-	 * prev now departs the cpu.  It's not interesting to record
-	 * stats about how efficient we were at scheduling the idle
-	 * process, however.
-	 */
-	if (prev != rq->idle)
-		sched_info_depart(prev);
+	int cpu;
 
-	if (next != rq->idle)
-		sched_info_arrive(next);
-}
-static inline void
-sched_info_switch(struct task_struct *prev, struct task_struct *next)
-{
-	if (unlikely(sched_info_on()))
-		__sched_info_switch(prev, next);
-}
-#else
-#define sched_info_queued(t)		do { } while (0)
-#define sched_info_switch(t, next)	do { } while (0)
-#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
+	assert_spin_locked(&task_rq(p)->lock);
 
-/*
- * Adding/removing a task to/from a priority array:
- */
-static void dequeue_task(struct task_struct *p, struct prio_array *array)
-{
-	array->nr_active--;
-	list_del(&p->run_list);
-	if (list_empty(array->queue + p->prio))
-		__clear_bit(p->prio, array->bitmap);
-}
+	if (unlikely(test_tsk_thread_flag(p, TIF_NEED_RESCHED)))
+		return;
 
-static void enqueue_task(struct task_struct *p, struct prio_array *array)
-{
-	sched_info_queued(p);
-	list_add_tail(&p->run_list, array->queue + p->prio);
-	__set_bit(p->prio, array->bitmap);
-	array->nr_active++;
-	p->array = array;
-}
+	set_tsk_thread_flag(p, TIF_NEED_RESCHED);
 
-/*
- * Put task to the end of the run list without the overhead of dequeue
- * followed by enqueue.
- */
-static void requeue_task(struct task_struct *p, struct prio_array *array)
-{
-	list_move_tail(&p->run_list, array->queue + p->prio);
-}
+	cpu = task_cpu(p);
+	if (cpu == smp_processor_id())
+		return;
 
-static inline void
-enqueue_task_head(struct task_struct *p, struct prio_array *array)
-{
-	list_add(&p->run_list, array->queue + p->prio);
-	__set_bit(p->prio, array->bitmap);
-	array->nr_active++;
-	p->array = array;
+	/* NEED_RESCHED must be visible before we test polling */
+	smp_mb();
+	if (!tsk_is_polling(p))
+		smp_send_reschedule(cpu);
 }
-
-/*
- * __normal_prio - return the priority that is based on the static
- * priority but is modified by bonuses/penalties.
- *
- * We scale the actual sleep average [0 .... MAX_SLEEP_AVG]
- * into the -5 ... 0 ... +5 bonus/penalty range.
- *
- * We use 25% of the full 0...39 priority range so that:
- *
- * 1) nice +19 interactive tasks do not preempt nice 0 CPU hogs.
- * 2) nice -20 CPU hogs do not get preempted by nice 0 tasks.
- *
- * Both properties are important to certain workloads.
- */
-
-static inline int __normal_prio(struct task_struct *p)
+#else
+static inline void resched_task(struct task_struct *p)
 {
-	int bonus, prio;
-
-	bonus = CURRENT_BONUS(p) - MAX_BONUS / 2;
-
-	prio = p->static_prio - bonus;
-	if (prio < MAX_RT_PRIO)
-		prio = MAX_RT_PRIO;
-	if (prio > MAX_PRIO-1)
-		prio = MAX_PRIO-1;
-	return prio;
+	assert_spin_locked(&task_rq(p)->lock);
+	set_tsk_need_resched(p);
 }
+#endif
 
 /*
  * To aid in avoiding the subversion of "niceness" due to uneven distribution
@@ -761,22 +544,33 @@ static inline int __normal_prio(struct t
 #define RTPRIO_TO_LOAD_WEIGHT(rp) \
 	(PRIO_TO_LOAD_WEIGHT(MAX_RT_PRIO) + LOAD_WEIGHT(rp))
 
+/*
+ * Nice levels are logarithmic. These are the load shifts assigned
+ * to nice levels, where a step of every 2 nice levels means a
+ * multiplicator of 2:
+ */
+const int prio_to_load_shift[40] = {
+/* -20 */ 20, 19, 19, 18, 18, 17, 17, 16, 16, 15,
+/* -10 */ 15, 14, 14, 13, 13, 12, 12, 11, 11, 10,
+/*   0 */ 10,  9,  9,  8,  8,  7,  7,  6,  6,  5,
+/*  10 */  5,  4,  4,  3,  3,  2,  2,  1,  1,  0
+};
+
+static int get_load_shift(struct task_struct *p)
+{
+	int prio = p->static_prio;
+
+	if (rt_prio(prio) || p->policy == SCHED_BATCH)
+		return 0;
+
+	return prio_to_load_shift[prio - MAX_RT_PRIO];
+}
+
 static void set_load_weight(struct task_struct *p)
 {
-	if (has_rt_policy(p)) {
-#ifdef CONFIG_SMP
-		if (p == task_rq(p)->migration_thread)
-			/*
-			 * The migration thread does the actual balancing.
-			 * Giving its load any weight will skew balancing
-			 * adversely.
-			 */
-			p->load_weight = 0;
-		else
-#endif
-			p->load_weight = RTPRIO_TO_LOAD_WEIGHT(p->rt_priority);
-	} else
-		p->load_weight = PRIO_TO_LOAD_WEIGHT(p->static_prio);
+	p->load_shift = get_load_shift(p);
+	p->load_weight = 1 << p->load_shift;
+	p->wait_runtime = 0;
 }
 
 static inline void
@@ -803,6 +597,40 @@ static inline void dec_nr_running(struct
 	dec_raw_weighted_load(rq, p);
 }
 
+static void activate_task(struct rq *rq, struct task_struct *p, int wakeup);
+
+#include "sched_stats.h"
+#include "sched_rt.c"
+#include "sched_fair.c"
+#include "sched_debug.c"
+
+#define sched_class_highest (&rt_sched_class)
+
+static void enqueue_task(struct rq *rq, struct task_struct *p, int wakeup)
+{
+	u64 now = rq_clock(rq);
+
+	sched_info_queued(p);
+	p->sched_class->enqueue_task(rq, p, wakeup, now);
+	p->on_rq = 1;
+}
+
+static void dequeue_task(struct rq *rq, struct task_struct *p, int sleep)
+{
+	u64 now = rq_clock(rq);
+
+	p->sched_class->dequeue_task(rq, p, sleep, now);
+	p->on_rq = 0;
+}
+
+/*
+ * __normal_prio - return the priority that is based on the static prio
+ */
+static inline int __normal_prio(struct task_struct *p)
+{
+	return p->static_prio;
+}
+
 /*
  * Calculate the expected normal priority: i.e. priority
  * without taking RT-inheritance into account. Might be
@@ -842,210 +670,31 @@ static int effective_prio(struct task_st
 }
 
 /*
- * __activate_task - move a task to the runqueue.
+ * activate_task - move a task to the runqueue.
  */
-static void __activate_task(struct task_struct *p, struct rq *rq)
+static void activate_task(struct rq *rq, struct task_struct *p, int wakeup)
 {
-	struct prio_array *target = rq->active;
-
-	if (batch_task(p))
-		target = rq->expired;
-	enqueue_task(p, target);
+	enqueue_task(rq, p, wakeup);
 	inc_nr_running(p, rq);
 }
 
 /*
- * __activate_idle_task - move idle task to the _front_ of runqueue.
+ * activate_idle_task - move idle task to the _front_ of runqueue.
  */
-static inline void __activate_idle_task(struct task_struct *p, struct rq *rq)
+static inline void activate_idle_task(struct task_struct *p, struct rq *rq)
 {
-	enqueue_task_head(p, rq->active);
+	enqueue_task(rq, p, 0);
 	inc_nr_running(p, rq);
 }
 
 /*
- * Recalculate p->normal_prio and p->prio after having slept,
- * updating the sleep-average too:
- */
-static int recalc_task_prio(struct task_struct *p, unsigned long long now)
-{
-	/* Caller must always ensure 'now >= p->timestamp' */
-	unsigned long sleep_time = now - p->timestamp;
-
-	if (batch_task(p))
-		sleep_time = 0;
-
-	if (likely(sleep_time > 0)) {
-		/*
-		 * This ceiling is set to the lowest priority that would allow
-		 * a task to be reinserted into the active array on timeslice
-		 * completion.
-		 */
-		unsigned long ceiling = INTERACTIVE_SLEEP(p);
-
-		if (p->mm && sleep_time > ceiling && p->sleep_avg < ceiling) {
-			/*
-			 * Prevents user tasks from achieving best priority
-			 * with one single large enough sleep.
-			 */
-			p->sleep_avg = ceiling;
-			/*
-			 * Using INTERACTIVE_SLEEP() as a ceiling places a
-			 * nice(0) task 1ms sleep away from promotion, and
-			 * gives it 700ms to round-robin with no chance of
-			 * being demoted.  This is more than generous, so
-			 * mark this sleep as non-interactive to prevent the
-			 * on-runqueue bonus logic from intervening should
-			 * this task not receive cpu immediately.
-			 */
-			p->sleep_type = SLEEP_NONINTERACTIVE;
-		} else {
-			/*
-			 * Tasks waking from uninterruptible sleep are
-			 * limited in their sleep_avg rise as they
-			 * are likely to be waiting on I/O
-			 */
-			if (p->sleep_type == SLEEP_NONINTERACTIVE && p->mm) {
-				if (p->sleep_avg >= ceiling)
-					sleep_time = 0;
-				else if (p->sleep_avg + sleep_time >=
-					 ceiling) {
-						p->sleep_avg = ceiling;
-						sleep_time = 0;
-				}
-			}
-
-			/*
-			 * This code gives a bonus to interactive tasks.
-			 *
-			 * The boost works by updating the 'average sleep time'
-			 * value here, based on ->timestamp. The more time a
-			 * task spends sleeping, the higher the average gets -
-			 * and the higher the priority boost gets as well.
-			 */
-			p->sleep_avg += sleep_time;
-
-		}
-		if (p->sleep_avg > NS_MAX_SLEEP_AVG)
-			p->sleep_avg = NS_MAX_SLEEP_AVG;
-	}
-
-	return effective_prio(p);
-}
-
-/*
- * activate_task - move a task to the runqueue and do priority recalculation
- *
- * Update all the scheduling statistics stuff. (sleep average
- * calculation, priority modifiers, etc.)
- */
-static void activate_task(struct task_struct *p, struct rq *rq, int local)
-{
-	unsigned long long now;
-
-	if (rt_task(p))
-		goto out;
-
-	now = sched_clock();
-#ifdef CONFIG_SMP
-	if (!local) {
-		/* Compensate for drifting sched_clock */
-		struct rq *this_rq = this_rq();
-		now = (now - this_rq->most_recent_timestamp)
-			+ rq->most_recent_timestamp;
-	}
-#endif
-
-	/*
-	 * Sleep time is in units of nanosecs, so shift by 20 to get a
-	 * milliseconds-range estimation of the amount of time that the task
-	 * spent sleeping:
-	 */
-	if (unlikely(prof_on == SLEEP_PROFILING)) {
-		if (p->state == TASK_UNINTERRUPTIBLE)
-			profile_hits(SLEEP_PROFILING, (void *)get_wchan(p),
-				     (now - p->timestamp) >> 20);
-	}
-
-	p->prio = recalc_task_prio(p, now);
-
-	/*
-	 * This checks to make sure it's not an uninterruptible task
-	 * that is now waking up.
-	 */
-	if (p->sleep_type == SLEEP_NORMAL) {
-		/*
-		 * Tasks which were woken up by interrupts (ie. hw events)
-		 * are most likely of interactive nature. So we give them
-		 * the credit of extending their sleep time to the period
-		 * of time they spend on the runqueue, waiting for execution
-		 * on a CPU, first time around:
-		 */
-		if (in_interrupt())
-			p->sleep_type = SLEEP_INTERRUPTED;
-		else {
-			/*
-			 * Normal first-time wakeups get a credit too for
-			 * on-runqueue time, but it will be weighted down:
-			 */
-			p->sleep_type = SLEEP_INTERACTIVE;
-		}
-	}
-	p->timestamp = now;
-out:
-	__activate_task(p, rq);
-}
-
-/*
  * deactivate_task - remove a task from the runqueue.
  */
-static void deactivate_task(struct task_struct *p, struct rq *rq)
+static void deactivate_task(struct rq *rq, struct task_struct *p, int sleep)
 {
+	dequeue_task(rq, p, sleep);
 	dec_nr_running(p, rq);
-	dequeue_task(p, p->array);
-	p->array = NULL;
-}
-
-/*
- * resched_task - mark a task 'to be rescheduled now'.
- *
- * On UP this means the setting of the need_resched flag, on SMP it
- * might also involve a cross-CPU call to trigger the scheduler on
- * the target CPU.
- */
-#ifdef CONFIG_SMP
-
-#ifndef tsk_is_polling
-#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
-#endif
-
-static void resched_task(struct task_struct *p)
-{
-	int cpu;
-
-	assert_spin_locked(&task_rq(p)->lock);
-
-	if (unlikely(test_tsk_thread_flag(p, TIF_NEED_RESCHED)))
-		return;
-
-	set_tsk_thread_flag(p, TIF_NEED_RESCHED);
-
-	cpu = task_cpu(p);
-	if (cpu == smp_processor_id())
-		return;
-
-	/* NEED_RESCHED must be visible before we test polling */
-	smp_mb();
-	if (!tsk_is_polling(p))
-		smp_send_reschedule(cpu);
-}
-#else
-static inline void resched_task(struct task_struct *p)
-{
-	assert_spin_locked(&task_rq(p)->lock);
-	set_tsk_need_resched(p);
 }
-#endif
 
 /**
  * task_curr - is this task currently executing on a CPU?
@@ -1085,7 +734,7 @@ migrate_task(struct task_struct *p, int 
 	 * If the task is not on a runqueue (and not running), then
 	 * it is sufficient to simply update the task's cpu field.
 	 */
-	if (!p->array && !task_running(rq, p)) {
+	if (!p->on_rq && !task_running(rq, p)) {
 		set_task_cpu(p, dest_cpu);
 		return 0;
 	}
@@ -1116,7 +765,7 @@ void wait_task_inactive(struct task_stru
 repeat:
 	rq = task_rq_lock(p, &flags);
 	/* Must be off runqueue entirely, not preempted. */
-	if (unlikely(p->array || task_running(rq, p))) {
+	if (unlikely(p->on_rq || task_running(rq, p))) {
 		/* If it's preempted, we yield.  It could be a while. */
 		preempted = !task_running(rq, p);
 		task_rq_unlock(rq, &flags);
@@ -1292,9 +941,9 @@ static int sched_balance_self(int cpu, i
 	struct sched_domain *tmp, *sd = NULL;
 
 	for_each_domain(cpu, tmp) {
- 		/*
- 	 	 * If power savings logic is enabled for a domain, stop there.
- 	 	 */
+		/*
+		 * If power savings logic is enabled for a domain, stop there.
+		 */
 		if (tmp->flags & SD_POWERSAVINGS_BALANCE)
 			break;
 		if (tmp->flags & flag)
@@ -1412,7 +1061,7 @@ static int try_to_wake_up(struct task_st
 	if (!(old_state & state))
 		goto out;
 
-	if (p->array)
+	if (p->on_rq)
 		goto out_running;
 
 	cpu = task_cpu(p);
@@ -1505,7 +1154,7 @@ out_set_cpu:
 		old_state = p->state;
 		if (!(old_state & state))
 			goto out;
-		if (p->array)
+		if (p->on_rq)
 			goto out_running;
 
 		this_cpu = smp_processor_id();
@@ -1514,25 +1163,10 @@ out_set_cpu:
 
 out_activate:
 #endif /* CONFIG_SMP */
-	if (old_state == TASK_UNINTERRUPTIBLE) {
+	if (old_state == TASK_UNINTERRUPTIBLE)
 		rq->nr_uninterruptible--;
-		/*
-		 * Tasks on involuntary sleep don't earn
-		 * sleep_avg beyond just interactive state.
-		 */
-		p->sleep_type = SLEEP_NONINTERACTIVE;
-	} else
 
-	/*
-	 * Tasks that have marked their sleep as noninteractive get
-	 * woken up with their sleep average not weighted in an
-	 * interactive way.
-	 */
-		if (old_state & TASK_NONINTERACTIVE)
-			p->sleep_type = SLEEP_NONINTERACTIVE;
-
-
-	activate_task(p, rq, cpu == this_cpu);
+	activate_task(rq, p, 1);
 	/*
 	 * Sync wakeups (i.e. those types of wakeups where the waker
 	 * has indicated that it will leave the CPU in short order)
@@ -1541,10 +1175,8 @@ out_activate:
 	 * the waker guarantees that the freshly woken up task is going
 	 * to be considered on this CPU.)
 	 */
-	if (!sync || cpu != this_cpu) {
-		if (TASK_PREEMPTS_CURR(p, rq))
-			resched_task(rq->curr);
-	}
+	if (!sync || cpu != this_cpu)
+		check_preempt_curr(rq, p);
 	success = 1;
 
 out_running:
@@ -1567,19 +1199,35 @@ int fastcall wake_up_state(struct task_s
 	return try_to_wake_up(p, state, 0);
 }
 
-static void task_running_tick(struct rq *rq, struct task_struct *p);
+/*
+ * The task was running during this tick - call the class tick
+ * (to update the time slice counter and other statistics, etc.):
+ */
+static void task_running_tick(struct rq *rq, struct task_struct *p)
+{
+	spin_lock(&rq->lock);
+	p->sched_class->task_tick(rq, p);
+	spin_unlock(&rq->lock);
+}
+
 /*
  * Perform scheduler related setup for a newly forked process p.
  * p is forked by current.
+ *
+ * __sched_fork() is basic setup used by init_idle() too:
  */
-void fastcall sched_fork(struct task_struct *p, int clone_flags)
+static void __sched_fork(struct task_struct *p)
 {
-	int cpu = get_cpu();
+	p->wait_start_fair = p->wait_start = p->exec_start = p->last_ran = 0;
+	p->sum_exec_runtime = p->wait_runtime = 0;
+	p->sum_wait_runtime = 0;
+	p->sleep_start = p->block_start = 0;
+	p->sleep_max = p->block_max = p->exec_max = p->wait_max = 0;
 
-#ifdef CONFIG_SMP
-	cpu = sched_balance_self(cpu, SD_BALANCE_FORK);
-#endif
-	set_task_cpu(p, cpu);
+	INIT_LIST_HEAD(&p->run_list);
+	p->on_rq = 0;
+	p->nr_switches = 0;
+	p->min_wait_runtime = 0;
 
 	/*
 	 * We mark the process as running here, but have not actually
@@ -1588,16 +1236,29 @@ void fastcall sched_fork(struct task_str
 	 * event cannot wake it up and insert it on the runqueue either.
 	 */
 	p->state = TASK_RUNNING;
+}
+
+/*
+ * fork()/clone()-time setup:
+ */
+void sched_fork(struct task_struct *p, int clone_flags)
+{
+	int cpu = get_cpu();
+
+	__sched_fork(p);
+
+#ifdef CONFIG_SMP
+	cpu = sched_balance_self(cpu, SD_BALANCE_FORK);
+#endif
+	set_task_cpu(p, cpu);
 
 	/*
 	 * Make sure we do not leak PI boosting priority to the child:
 	 */
 	p->prio = current->normal_prio;
 
-	INIT_LIST_HEAD(&p->run_list);
-	p->array = NULL;
 #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
-	if (unlikely(sched_info_on()))
+	if (likely(sched_info_on()))
 		memset(&p->sched_info, 0, sizeof(p->sched_info));
 #endif
 #if defined(CONFIG_SMP) && defined(__ARCH_WANT_UNLOCKED_CTXSW)
@@ -1607,34 +1268,16 @@ void fastcall sched_fork(struct task_str
 	/* Want to start with kernel preemption disabled. */
 	task_thread_info(p)->preempt_count = 1;
 #endif
-	/*
-	 * Share the timeslice between parent and child, thus the
-	 * total amount of pending timeslices in the system doesn't change,
-	 * resulting in more scheduling fairness.
-	 */
-	local_irq_disable();
-	p->time_slice = (current->time_slice + 1) >> 1;
-	/*
-	 * The remainder of the first timeslice might be recovered by
-	 * the parent if the child exits early enough.
-	 */
-	p->first_time_slice = 1;
-	current->time_slice >>= 1;
-	p->timestamp = sched_clock();
-	if (unlikely(!current->time_slice)) {
-		/*
-		 * This case is rare, it happens when the parent has only
-		 * a single jiffy left from its timeslice. Taking the
-		 * runqueue lock is not a problem.
-		 */
-		current->time_slice = 1;
-		task_running_tick(cpu_rq(cpu), current);
-	}
-	local_irq_enable();
 	put_cpu();
 }
 
 /*
+ * After fork, child runs first. (default) If set to 0 then
+ * parent will (try to) run first.
+ */
+unsigned int __read_mostly sysctl_sched_child_runs_first = 1;
+
+/*
  * wake_up_new_task - wake up a newly created task for the first time.
  *
  * This function will do some initial scheduler statistics housekeeping
@@ -1643,107 +1286,27 @@ void fastcall sched_fork(struct task_str
  */
 void fastcall wake_up_new_task(struct task_struct *p, unsigned long clone_flags)
 {
-	struct rq *rq, *this_rq;
 	unsigned long flags;
-	int this_cpu, cpu;
+	struct rq *rq;
+	int this_cpu;
 
 	rq = task_rq_lock(p, &flags);
 	BUG_ON(p->state != TASK_RUNNING);
-	this_cpu = smp_processor_id();
-	cpu = task_cpu(p);
-
-	/*
-	 * We decrease the sleep average of forking parents
-	 * and children as well, to keep max-interactive tasks
-	 * from forking tasks that are max-interactive. The parent
-	 * (current) is done further down, under its lock.
-	 */
-	p->sleep_avg = JIFFIES_TO_NS(CURRENT_BONUS(p) *
-		CHILD_PENALTY / 100 * MAX_SLEEP_AVG / MAX_BONUS);
+	this_cpu = smp_processor_id(); /* parent's CPU */
 
 	p->prio = effective_prio(p);
 
-	if (likely(cpu == this_cpu)) {
-		if (!(clone_flags & CLONE_VM)) {
-			/*
-			 * The VM isn't cloned, so we're in a good position to
-			 * do child-runs-first in anticipation of an exec. This
-			 * usually avoids a lot of COW overhead.
-			 */
-			if (unlikely(!current->array))
-				__activate_task(p, rq);
-			else {
-				p->prio = current->prio;
-				p->normal_prio = current->normal_prio;
-				list_add_tail(&p->run_list, &current->run_list);
-				p->array = current->array;
-				p->array->nr_active++;
-				inc_nr_running(p, rq);
-			}
-			set_need_resched();
-		} else
-			/* Run child last */
-			__activate_task(p, rq);
-		/*
-		 * We skip the following code due to cpu == this_cpu
-	 	 *
-		 *   task_rq_unlock(rq, &flags);
-		 *   this_rq = task_rq_lock(current, &flags);
-		 */
-		this_rq = rq;
+	if (!sysctl_sched_child_runs_first || (clone_flags & CLONE_VM) ||
+			task_cpu(p) != this_cpu || !current->on_rq) {
+		activate_task(rq, p, 0);
 	} else {
-		this_rq = cpu_rq(this_cpu);
-
-		/*
-		 * Not the local CPU - must adjust timestamp. This should
-		 * get optimised away in the !CONFIG_SMP case.
-		 */
-		p->timestamp = (p->timestamp - this_rq->most_recent_timestamp)
-					+ rq->most_recent_timestamp;
-		__activate_task(p, rq);
-		if (TASK_PREEMPTS_CURR(p, rq))
-			resched_task(rq->curr);
-
 		/*
-		 * Parent and child are on different CPUs, now get the
-		 * parent runqueue to update the parent's ->sleep_avg:
+		 * Let the scheduling class do new task startup
+		 * management (if any):
 		 */
-		task_rq_unlock(rq, &flags);
-		this_rq = task_rq_lock(current, &flags);
+		p->sched_class->task_new(rq, p);
 	}
-	current->sleep_avg = JIFFIES_TO_NS(CURRENT_BONUS(current) *
-		PARENT_PENALTY / 100 * MAX_SLEEP_AVG / MAX_BONUS);
-	task_rq_unlock(this_rq, &flags);
-}
-
-/*
- * Potentially available exiting-child timeslices are
- * retrieved here - this way the parent does not get
- * penalized for creating too many threads.
- *
- * (this cannot be used to 'generate' timeslices
- * artificially, because any timeslice recovered here
- * was given away by the parent in the first place.)
- */
-void fastcall sched_exit(struct task_struct *p)
-{
-	unsigned long flags;
-	struct rq *rq;
-
-	/*
-	 * If the child was a (relative-) CPU hog then decrease
-	 * the sleep_avg of the parent as well.
-	 */
-	rq = task_rq_lock(p->parent, &flags);
-	if (p->first_time_slice && task_cpu(p) == task_cpu(p->parent)) {
-		p->parent->time_slice += p->time_slice;
-		if (unlikely(p->parent->time_slice > task_timeslice(p)))
-			p->parent->time_slice = task_timeslice(p);
-	}
-	if (p->sleep_avg < p->parent->sleep_avg)
-		p->parent->sleep_avg = p->parent->sleep_avg /
-		(EXIT_WEIGHT + 1) * EXIT_WEIGHT + p->sleep_avg /
-		(EXIT_WEIGHT + 1);
+	check_preempt_curr(rq, p);
 	task_rq_unlock(rq, &flags);
 }
 
@@ -1941,17 +1504,56 @@ unsigned long nr_active(void)
 	return running + uninterruptible;
 }
 
-#ifdef CONFIG_SMP
-
-/*
- * Is this task likely cache-hot:
- */
-static inline int
-task_hot(struct task_struct *p, unsigned long long now, struct sched_domain *sd)
+static void update_load_fair(struct rq *this_rq)
 {
-	return (long long)(now - p->last_ran) < (long long)sd->cache_hot_time;
+	unsigned long this_load, fair_delta, exec_delta, idle_delta;
+	unsigned int i, scale;
+	s64 fair_delta64, exec_delta64;
+	unsigned long tmp;
+	u64 tmp64;
+
+	this_rq->nr_load_updates++;
+
+	fair_delta64 = this_rq->fair_clock - this_rq->prev_fair_clock + 1;
+	this_rq->prev_fair_clock = this_rq->fair_clock;
+	WARN_ON_ONCE(fair_delta64 <= 0);
+
+	exec_delta64 = this_rq->exec_clock - this_rq->prev_exec_clock + 1;
+	this_rq->prev_exec_clock = this_rq->exec_clock;
+	WARN_ON_ONCE(exec_delta64 <= 0);
+
+	if (fair_delta64 > (s64)LONG_MAX)
+		fair_delta64 = (s64)LONG_MAX;
+	fair_delta = (unsigned long)fair_delta64;
+
+	if (exec_delta64 > (s64)LONG_MAX)
+		exec_delta64 = (s64)LONG_MAX;
+	exec_delta = (unsigned long)exec_delta64;
+	if (exec_delta > TICK_NSEC)
+		exec_delta = TICK_NSEC;
+
+	idle_delta = TICK_NSEC - exec_delta;
+
+	tmp = (SCHED_LOAD_SCALE * exec_delta) / fair_delta;
+	tmp64 = (u64)tmp * (u64)exec_delta;
+	do_div(tmp64, TICK_NSEC);
+	this_load = (unsigned long)tmp64;
+
+	/* Update our load: */
+	for (i = 0, scale = 1; i < CPU_LOAD_IDX_MAX; i++, scale += scale) {
+		unsigned long old_load, new_load;
+
+		/* scale is effectively 1 << i now, and >> i divides by scale */
+
+		old_load = this_rq->cpu_load[i];
+		new_load = this_load;
+
+		this_rq->cpu_load[i] = (old_load*(scale-1) + new_load) >> i;
+	}
 }
 
+#ifdef CONFIG_SMP
+
 /*
  * double_rq_lock - safely lock two runqueues
  *
@@ -2068,23 +1670,17 @@ void sched_exec(void)
  * pull_task - move a task from a remote runqueue to the local runqueue.
  * Both runqueues must be locked.
  */
-static void pull_task(struct rq *src_rq, struct prio_array *src_array,
-		      struct task_struct *p, struct rq *this_rq,
-		      struct prio_array *this_array, int this_cpu)
+static void pull_task(struct rq *src_rq, struct task_struct *p,
+		      struct rq *this_rq, int this_cpu)
 {
-	dequeue_task(p, src_array);
-	dec_nr_running(p, src_rq);
+	deactivate_task(src_rq, p, 0);
 	set_task_cpu(p, this_cpu);
-	inc_nr_running(p, this_rq);
-	enqueue_task(p, this_array);
-	p->timestamp = (p->timestamp - src_rq->most_recent_timestamp)
-				+ this_rq->most_recent_timestamp;
+	activate_task(this_rq, p, 0);
 	/*
 	 * Note that idle threads have a prio of MAX_PRIO, for this test
 	 * to be always true for them.
 	 */
-	if (TASK_PREEMPTS_CURR(p, this_rq))
-		resched_task(this_rq->curr);
+	check_preempt_curr(this_rq, p);
 }
 
 /*
@@ -2109,25 +1705,59 @@ int can_migrate_task(struct task_struct 
 		return 0;
 
 	/*
-	 * Aggressive migration if:
-	 * 1) task is cache cold, or
-	 * 2) too many balance attempts have failed.
+	 * Aggressive migration if too many balance attempts have failed:
 	 */
-
-	if (sd->nr_balance_failed > sd->cache_nice_tries) {
-#ifdef CONFIG_SCHEDSTATS
-		if (task_hot(p, rq->most_recent_timestamp, sd))
-			schedstat_inc(sd, lb_hot_gained[idle]);
-#endif
+	if (sd->nr_balance_failed > sd->cache_nice_tries)
 		return 1;
-	}
 
-	if (task_hot(p, rq->most_recent_timestamp, sd))
-		return 0;
 	return 1;
 }
 
-#define rq_best_prio(rq) min((rq)->curr->prio, (rq)->best_expired_prio)
+/*
+ * Load-balancing iterator: iterate through the hieararchy of scheduling
+ * classes, starting with the highest-prio one:
+ */
+
+struct task_struct * load_balance_start(struct rq *rq)
+{
+	struct sched_class *class = sched_class_highest;
+	struct task_struct *p;
+
+	do {
+		p = class->load_balance_start(rq);
+		if (p) {
+			rq->load_balance_class = class;
+			return p;
+		}
+		class = class->next;
+	} while (class);
+
+	return NULL;
+}
+
+struct task_struct * load_balance_next(struct rq *rq)
+{
+	struct sched_class *class = rq->load_balance_class;
+	struct task_struct *p;
+
+	p = class->load_balance_next(rq);
+	if (p)
+		return p;
+	/*
+	 * Pick up the next class (if any) and attempt to start
+	 * the iterator there:
+	 */
+	while ((class = class->next)) {
+		p = class->load_balance_start(rq);
+		if (p) {
+			rq->load_balance_class = class;
+			return p;
+		}
+	}
+	return NULL;
+}
+
+#define rq_best_prio(rq) (rq)->curr->prio
 
 /*
  * move_tasks tries to move up to max_nr_move tasks and max_load_move weighted
@@ -2141,11 +1771,9 @@ static int move_tasks(struct rq *this_rq
 		      struct sched_domain *sd, enum idle_type idle,
 		      int *all_pinned)
 {
-	int idx, pulled = 0, pinned = 0, this_best_prio, best_prio,
+	int pulled = 0, pinned = 0, this_best_prio, best_prio,
 	    best_prio_seen, skip_for_load;
-	struct prio_array *array, *dst_array;
-	struct list_head *head, *curr;
-	struct task_struct *tmp;
+	struct task_struct *p;
 	long rem_load_move;
 
 	if (max_nr_move == 0 || max_load_move == 0)
@@ -2165,76 +1793,41 @@ static int move_tasks(struct rq *this_rq
 	best_prio_seen = best_prio == busiest->curr->prio;
 
 	/*
-	 * We first consider expired tasks. Those will likely not be
-	 * executed in the near future, and they are most likely to
-	 * be cache-cold, thus switching CPUs has the least effect
-	 * on them.
-	 */
-	if (busiest->expired->nr_active) {
-		array = busiest->expired;
-		dst_array = this_rq->expired;
-	} else {
-		array = busiest->active;
-		dst_array = this_rq->active;
-	}
-
-new_array:
-	/* Start searching at priority 0: */
-	idx = 0;
-skip_bitmap:
-	if (!idx)
-		idx = sched_find_first_bit(array->bitmap);
-	else
-		idx = find_next_bit(array->bitmap, MAX_PRIO, idx);
-	if (idx >= MAX_PRIO) {
-		if (array == busiest->expired && busiest->active->nr_active) {
-			array = busiest->active;
-			dst_array = this_rq->active;
-			goto new_array;
-		}
+	 * Start the load-balancing iterator:
+	 */
+	p = load_balance_start(busiest);
+next:
+	if (!p)
 		goto out;
-	}
-
-	head = array->queue + idx;
-	curr = head->prev;
-skip_queue:
-	tmp = list_entry(curr, struct task_struct, run_list);
-
-	curr = curr->prev;
-
 	/*
 	 * To help distribute high priority tasks accross CPUs we don't
 	 * skip a task if it will be the highest priority task (i.e. smallest
 	 * prio value) on its new queue regardless of its load weight
 	 */
-	skip_for_load = tmp->load_weight > rem_load_move;
-	if (skip_for_load && idx < this_best_prio)
-		skip_for_load = !best_prio_seen && idx == best_prio;
+	skip_for_load = p->load_weight > rem_load_move;
+	if (skip_for_load && p->prio < this_best_prio)
+		skip_for_load = !best_prio_seen && p->prio == best_prio;
 	if (skip_for_load ||
-	    !can_migrate_task(tmp, busiest, this_cpu, sd, idle, &pinned)) {
+	    !can_migrate_task(p, busiest, this_cpu, sd, idle, &pinned)) {
 
-		best_prio_seen |= idx == best_prio;
-		if (curr != head)
-			goto skip_queue;
-		idx++;
-		goto skip_bitmap;
+		best_prio_seen |= p->prio == best_prio;
+		p = load_balance_next(busiest);
+		goto next;
 	}
 
-	pull_task(busiest, array, tmp, this_rq, dst_array, this_cpu);
+	pull_task(busiest, p, this_rq, this_cpu);
 	pulled++;
-	rem_load_move -= tmp->load_weight;
+	rem_load_move -= p->load_weight;
 
 	/*
 	 * We only want to steal up to the prescribed number of tasks
 	 * and the prescribed amount of weighted load.
 	 */
 	if (pulled < max_nr_move && rem_load_move > 0) {
-		if (idx < this_best_prio)
-			this_best_prio = idx;
-		if (curr != head)
-			goto skip_queue;
-		idx++;
-		goto skip_bitmap;
+		if (p->prio < this_best_prio)
+			this_best_prio = p->prio;
+		p = load_balance_next(busiest);
+		goto next;
 	}
 out:
 	/*
@@ -2360,8 +1953,8 @@ find_busiest_group(struct sched_domain *
 		 * Busy processors will not participate in power savings
 		 * balance.
 		 */
- 		if (idle == NOT_IDLE || !(sd->flags & SD_POWERSAVINGS_BALANCE))
- 			goto group_next;
+		if (idle == NOT_IDLE || !(sd->flags & SD_POWERSAVINGS_BALANCE))
+			goto group_next;
 
 		/*
 		 * If the local group is idle or completely loaded
@@ -2371,42 +1964,42 @@ find_busiest_group(struct sched_domain *
 				    !this_nr_running))
 			power_savings_balance = 0;
 
- 		/*
+		/*
 		 * If a group is already running at full capacity or idle,
 		 * don't include that group in power savings calculations
- 		 */
- 		if (!power_savings_balance || sum_nr_running >= group_capacity
+		 */
+		if (!power_savings_balance || sum_nr_running >= group_capacity
 		    || !sum_nr_running)
- 			goto group_next;
+			goto group_next;
 
- 		/*
+		/*
 		 * Calculate the group which has the least non-idle load.
- 		 * This is the group from where we need to pick up the load
- 		 * for saving power
- 		 */
- 		if ((sum_nr_running < min_nr_running) ||
- 		    (sum_nr_running == min_nr_running &&
+		 * This is the group from where we need to pick up the load
+		 * for saving power
+		 */
+		if ((sum_nr_running < min_nr_running) ||
+		    (sum_nr_running == min_nr_running &&
 		     first_cpu(group->cpumask) <
 		     first_cpu(group_min->cpumask))) {
- 			group_min = group;
- 			min_nr_running = sum_nr_running;
+			group_min = group;
+			min_nr_running = sum_nr_running;
 			min_load_per_task = sum_weighted_load /
 						sum_nr_running;
- 		}
+		}
 
- 		/*
+		/*
 		 * Calculate the group which is almost near its
- 		 * capacity but still has some space to pick up some load
- 		 * from other group and save more power
- 		 */
- 		if (sum_nr_running <= group_capacity - 1) {
- 			if (sum_nr_running > leader_nr_running ||
- 			    (sum_nr_running == leader_nr_running &&
- 			     first_cpu(group->cpumask) >
- 			      first_cpu(group_leader->cpumask))) {
- 				group_leader = group;
- 				leader_nr_running = sum_nr_running;
- 			}
+		 * capacity but still has some space to pick up some load
+		 * from other group and save more power
+		 */
+		if (sum_nr_running <= group_capacity - 1) {
+			if (sum_nr_running > leader_nr_running ||
+			    (sum_nr_running == leader_nr_running &&
+			     first_cpu(group->cpumask) >
+			      first_cpu(group_leader->cpumask))) {
+				group_leader = group;
+				leader_nr_running = sum_nr_running;
+			}
 		}
 group_next:
 #endif
@@ -2461,7 +2054,7 @@ group_next:
 	 * a think about bumping its value to force at least one task to be
 	 * moved
 	 */
-	if (*imbalance < busiest_load_per_task) {
+	if (*imbalance + SCHED_LOAD_SCALE_FUZZ < busiest_load_per_task) {
 		unsigned long tmp, pwr_now, pwr_move;
 		unsigned int imbn;
 
@@ -2475,7 +2068,8 @@ small_imbalance:
 		} else
 			this_load_per_task = SCHED_LOAD_SCALE;
 
-		if (max_load - this_load >= busiest_load_per_task * imbn) {
+		if (max_load - this_load + SCHED_LOAD_SCALE_FUZZ >=
+					busiest_load_per_task * imbn) {
 			*imbalance = busiest_load_per_task;
 			return busiest;
 		}
@@ -2884,30 +2478,6 @@ static void active_load_balance(struct r
 	spin_unlock(&target_rq->lock);
 }
 
-static void update_load(struct rq *this_rq)
-{
-	unsigned long this_load;
-	int i, scale;
-
-	this_load = this_rq->raw_weighted_load;
-
-	/* Update our load: */
-	for (i = 0, scale = 1; i < 3; i++, scale <<= 1) {
-		unsigned long old_load, new_load;
-
-		old_load = this_rq->cpu_load[i];
-		new_load = this_load;
-		/*
-		 * Round up the averaging division if load is increasing. This
-		 * prevents us from getting stuck on 9 if the load is 10, for
-		 * example.
-		 */
-		if (new_load > old_load)
-			new_load += scale-1;
-		this_rq->cpu_load[i] = (old_load*(scale-1) + new_load) / scale;
-	}
-}
-
 /*
  * run_rebalance_domains is triggered when needed from the scheduler tick.
  *
@@ -2987,76 +2557,27 @@ static inline void idle_balance(int cpu,
 }
 #endif
 
-static inline void wake_priority_sleeper(struct rq *rq)
-{
-#ifdef CONFIG_SCHED_SMT
-	if (!rq->nr_running)
-		return;
-
-	spin_lock(&rq->lock);
-	/*
-	 * If an SMT sibling task has been put to sleep for priority
-	 * reasons reschedule the idle task to see if it can now run.
-	 */
-	if (rq->nr_running)
-		resched_task(rq->idle);
-	spin_unlock(&rq->lock);
-#endif
-}
-
 DEFINE_PER_CPU(struct kernel_stat, kstat);
 
 EXPORT_PER_CPU_SYMBOL(kstat);
 
 /*
- * This is called on clock ticks and on context switches.
- * Bank in p->sched_time the ns elapsed since the last tick or switch.
- */
-static inline void
-update_cpu_clock(struct task_struct *p, struct rq *rq, unsigned long long now)
-{
-	p->sched_time += now - p->last_ran;
-	p->last_ran = rq->most_recent_timestamp = now;
-}
-
-/*
- * Return current->sched_time plus any more ns on the sched_clock
+ * Return current->sum_exec_runtime plus any more ns on the sched_clock
  * that have not yet been banked.
  */
-unsigned long long current_sched_time(const struct task_struct *p)
+unsigned long long current_sched_runtime(const struct task_struct *p)
 {
 	unsigned long long ns;
 	unsigned long flags;
 
 	local_irq_save(flags);
-	ns = p->sched_time + sched_clock() - p->last_ran;
+	ns = p->sum_exec_runtime + sched_clock() - p->last_ran;
 	local_irq_restore(flags);
 
 	return ns;
 }
 
 /*
- * We place interactive tasks back into the active array, if possible.
- *
- * To guarantee that this does not starve expired tasks we ignore the
- * interactivity of a task if the first expired task had to wait more
- * than a 'reasonable' amount of time. This deadline timeout is
- * load-dependent, as the frequency of array switched decreases with
- * increasing number of running tasks. We also ignore the interactivity
- * if a better static_prio task has expired:
- */
-static inline int expired_starving(struct rq *rq)
-{
-	if (rq->curr->static_prio > rq->best_expired_prio)
-		return 1;
-	if (!STARVATION_LIMIT || !rq->expired_timestamp)
-		return 0;
-	if (jiffies - rq->expired_timestamp > STARVATION_LIMIT * rq->nr_running)
-		return 1;
-	return 0;
-}
-
-/*
  * Account user cpu time to a process.
  * @p: the process that the cpu time gets accounted to
  * @hardirq_offset: the offset to subtract from hardirq_count()
@@ -3129,81 +2650,6 @@ void account_steal_time(struct task_stru
 		cpustat->steal = cputime64_add(cpustat->steal, tmp);
 }
 
-static void task_running_tick(struct rq *rq, struct task_struct *p)
-{
-	if (p->array != rq->active) {
-		/* Task has expired but was not scheduled yet */
-		set_tsk_need_resched(p);
-		return;
-	}
-	spin_lock(&rq->lock);
-	/*
-	 * The task was running during this tick - update the
-	 * time slice counter. Note: we do not update a thread's
-	 * priority until it either goes to sleep or uses up its
-	 * timeslice. This makes it possible for interactive tasks
-	 * to use up their timeslices at their highest priority levels.
-	 */
-	if (rt_task(p)) {
-		/*
-		 * RR tasks need a special form of timeslice management.
-		 * FIFO tasks have no timeslices.
-		 */
-		if ((p->policy == SCHED_RR) && !--p->time_slice) {
-			p->time_slice = task_timeslice(p);
-			p->first_time_slice = 0;
-			set_tsk_need_resched(p);
-
-			/* put it at the end of the queue: */
-			requeue_task(p, rq->active);
-		}
-		goto out_unlock;
-	}
-	if (!--p->time_slice) {
-		dequeue_task(p, rq->active);
-		set_tsk_need_resched(p);
-		p->prio = effective_prio(p);
-		p->time_slice = task_timeslice(p);
-		p->first_time_slice = 0;
-
-		if (!rq->expired_timestamp)
-			rq->expired_timestamp = jiffies;
-		if (!TASK_INTERACTIVE(p) || expired_starving(rq)) {
-			enqueue_task(p, rq->expired);
-			if (p->static_prio < rq->best_expired_prio)
-				rq->best_expired_prio = p->static_prio;
-		} else
-			enqueue_task(p, rq->active);
-	} else {
-		/*
-		 * Prevent a too long timeslice allowing a task to monopolize
-		 * the CPU. We do this by splitting up the timeslice into
-		 * smaller pieces.
-		 *
-		 * Note: this does not mean the task's timeslices expire or
-		 * get lost in any way, they just might be preempted by
-		 * another task of equal priority. (one with higher
-		 * priority would have preempted this task already.) We
-		 * requeue this task to the end of the list on this priority
-		 * level, which is in essence a round-robin of tasks with
-		 * equal priority.
-		 *
-		 * This only applies to tasks in the interactive
-		 * delta range with at least TIMESLICE_GRANULARITY to requeue.
-		 */
-		if (TASK_INTERACTIVE(p) && !((task_timeslice(p) -
-			p->time_slice) % TIMESLICE_GRANULARITY(p)) &&
-			(p->time_slice >= TIMESLICE_GRANULARITY(p)) &&
-			(p->array == rq->active)) {
-
-			requeue_task(p, rq->active);
-			set_tsk_need_resched(p);
-		}
-	}
-out_unlock:
-	spin_unlock(&rq->lock);
-}
-
 /*
  * This function gets called by the timer code, with HZ frequency.
  * We call it with interrupts disabled.
@@ -3213,155 +2659,19 @@ out_unlock:
  */
 void scheduler_tick(void)
 {
-	unsigned long long now = sched_clock();
 	struct task_struct *p = current;
 	int cpu = smp_processor_id();
 	struct rq *rq = cpu_rq(cpu);
 
-	update_cpu_clock(p, rq, now);
-
-	if (p == rq->idle)
-		/* Task on the idle queue */
-		wake_priority_sleeper(rq);
-	else
+	if (p != rq->idle)
 		task_running_tick(rq, p);
+	update_load_fair(rq);
 #ifdef CONFIG_SMP
-	update_load(rq);
 	if (time_after_eq(jiffies, rq->next_balance))
 		raise_softirq(SCHED_SOFTIRQ);
 #endif
 }
 
-#ifdef CONFIG_SCHED_SMT
-static inline void wakeup_busy_runqueue(struct rq *rq)
-{
-	/* If an SMT runqueue is sleeping due to priority reasons wake it up */
-	if (rq->curr == rq->idle && rq->nr_running)
-		resched_task(rq->idle);
-}
-
-/*
- * Called with interrupt disabled and this_rq's runqueue locked.
- */
-static void wake_sleeping_dependent(int this_cpu)
-{
-	struct sched_domain *tmp, *sd = NULL;
-	int i;
-
-	for_each_domain(this_cpu, tmp) {
-		if (tmp->flags & SD_SHARE_CPUPOWER) {
-			sd = tmp;
-			break;
-		}
-	}
-
-	if (!sd)
-		return;
-
-	for_each_cpu_mask(i, sd->span) {
-		struct rq *smt_rq = cpu_rq(i);
-
-		if (i == this_cpu)
-			continue;
-		if (unlikely(!spin_trylock(&smt_rq->lock)))
-			continue;
-
-		wakeup_busy_runqueue(smt_rq);
-		spin_unlock(&smt_rq->lock);
-	}
-}
-
-/*
- * number of 'lost' timeslices this task wont be able to fully
- * utilize, if another task runs on a sibling. This models the
- * slowdown effect of other tasks running on siblings:
- */
-static inline unsigned long
-smt_slice(struct task_struct *p, struct sched_domain *sd)
-{
-	return p->time_slice * (100 - sd->per_cpu_gain) / 100;
-}
-
-/*
- * To minimise lock contention and not have to drop this_rq's runlock we only
- * trylock the sibling runqueues and bypass those runqueues if we fail to
- * acquire their lock. As we only trylock the normal locking order does not
- * need to be obeyed.
- */
-static int
-dependent_sleeper(int this_cpu, struct rq *this_rq, struct task_struct *p)
-{
-	struct sched_domain *tmp, *sd = NULL;
-	int ret = 0, i;
-
-	/* kernel/rt threads do not participate in dependent sleeping */
-	if (!p->mm || rt_task(p))
-		return 0;
-
-	for_each_domain(this_cpu, tmp) {
-		if (tmp->flags & SD_SHARE_CPUPOWER) {
-			sd = tmp;
-			break;
-		}
-	}
-
-	if (!sd)
-		return 0;
-
-	for_each_cpu_mask(i, sd->span) {
-		struct task_struct *smt_curr;
-		struct rq *smt_rq;
-
-		if (i == this_cpu)
-			continue;
-
-		smt_rq = cpu_rq(i);
-		if (unlikely(!spin_trylock(&smt_rq->lock)))
-			continue;
-
-		smt_curr = smt_rq->curr;
-
-		if (!smt_curr->mm)
-			goto unlock;
-
-		/*
-		 * If a user task with lower static priority than the
-		 * running task on the SMT sibling is trying to schedule,
-		 * delay it till there is proportionately less timeslice
-		 * left of the sibling task to prevent a lower priority
-		 * task from using an unfair proportion of the
-		 * physical cpu's resources. -ck
-		 */
-		if (rt_task(smt_curr)) {
-			/*
-			 * With real time tasks we run non-rt tasks only
-			 * per_cpu_gain% of the time.
-			 */
-			if ((jiffies % DEF_TIMESLICE) >
-				(sd->per_cpu_gain * DEF_TIMESLICE / 100))
-					ret = 1;
-		} else {
-			if (smt_curr->static_prio < p->static_prio &&
-				!TASK_PREEMPTS_CURR(p, smt_rq) &&
-				smt_slice(smt_curr, sd) > task_timeslice(p))
-					ret = 1;
-		}
-unlock:
-		spin_unlock(&smt_rq->lock);
-	}
-	return ret;
-}
-#else
-static inline void wake_sleeping_dependent(int this_cpu)
-{
-}
-static inline int
-dependent_sleeper(int this_cpu, struct rq *this_rq, struct task_struct *p)
-{
-	return 0;
-}
-#endif
-
 #if defined(CONFIG_PREEMPT) && defined(CONFIG_DEBUG_PREEMPT)
 
 void fastcall add_preempt_count(int val)
@@ -3400,49 +2710,27 @@ EXPORT_SYMBOL(sub_preempt_count);
 
 #endif
 
-static inline int interactive_sleep(enum sleep_type sleep_type)
-{
-	return (sleep_type == SLEEP_INTERACTIVE ||
-		sleep_type == SLEEP_INTERRUPTED);
-}
-
 /*
- * schedule() is the main scheduler function.
+ * Various schedule()-time debugging checks and statistics:
  */
-asmlinkage void __sched schedule(void)
+static inline void schedule_debug(struct rq *rq, struct task_struct *prev)
 {
-	struct task_struct *prev, *next;
-	struct prio_array *array;
-	struct list_head *queue;
-	unsigned long long now;
-	unsigned long run_time;
-	int cpu, idx, new_prio;
-	long *switch_count;
-	struct rq *rq;
-
 	/*
 	 * Test if we are atomic.  Since do_exit() needs to call into
 	 * schedule() atomically, we ignore that path for now.
 	 * Otherwise, whine if we are scheduling when we should not be.
 	 */
-	if (unlikely(in_atomic() && !current->exit_state)) {
+	if (unlikely(in_atomic_preempt_off() && !prev->exit_state)) {
 		printk(KERN_ERR "BUG: scheduling while atomic: "
 			"%s/0x%08x/%d\n",
-			current->comm, preempt_count(), current->pid);
-		debug_show_held_locks(current);
+			prev->comm, preempt_count(), prev->pid);
+		debug_show_held_locks(prev);
 		if (irqs_disabled())
-			print_irqtrace_events(current);
+			print_irqtrace_events(prev);
 		dump_stack();
 	}
 	profile_hit(SCHED_PROFILING, __builtin_return_address(0));
 
-need_resched:
-	preempt_disable();
-	prev = current;
-	release_kernel_lock(prev);
-need_resched_nonpreemptible:
-	rq = this_rq();
-
 	/*
 	 * The idle thread is not allowed to schedule!
 	 * Remove this check after it has been exercised a bit.
@@ -3453,19 +2741,45 @@ need_resched_nonpreemptible:
 	}
 
 	schedstat_inc(rq, sched_cnt);
-	now = sched_clock();
-	if (likely((long long)(now - prev->timestamp) < NS_MAX_SLEEP_AVG)) {
-		run_time = now - prev->timestamp;
-		if (unlikely((long long)(now - prev->timestamp) < 0))
-			run_time = 0;
-	} else
-		run_time = NS_MAX_SLEEP_AVG;
+}
 
-	/*
-	 * Tasks charged proportionately less run_time at high sleep_avg to
-	 * delay them losing their interactive status
-	 */
-	run_time /= (CURRENT_BONUS(prev) ? : 1);
+static inline struct task_struct *
+pick_next_task(struct rq *rq, struct task_struct *prev)
+{
+	struct sched_class *class = sched_class_highest;
+	u64 now = __rq_clock(rq);
+	struct task_struct *p;
+
+	prev->sched_class->put_prev_task(rq, prev, now);
+
+	do {
+		p = class->pick_next_task(rq, now);
+		if (p)
+			return p;
+		class = class->next;
+	} while (class);
+
+	return NULL;
+}
+
+/*
+ * schedule() is the main scheduler function.
+ */
+asmlinkage void __sched schedule(void)
+{
+	struct task_struct *prev, *next;
+	long *switch_count;
+	struct rq *rq;
+	int cpu;
+
+need_resched:
+	preempt_disable();
+	prev = current;
+	release_kernel_lock(prev);
+need_resched_nonpreemptible:
+	rq = this_rq();
+
+	schedule_debug(rq, prev);
 
 	spin_lock_irq(&rq->lock);
 
@@ -3478,7 +2792,7 @@ need_resched_nonpreemptible:
 		else {
 			if (prev->state == TASK_UNINTERRUPTIBLE)
 				rq->nr_uninterruptible++;
-			deactivate_task(prev, rq);
+			deactivate_task(rq, prev, 1);
 		}
 	}
 
@@ -3486,68 +2800,25 @@ need_resched_nonpreemptible:
 	if (unlikely(!rq->nr_running)) {
 		idle_balance(cpu, rq);
 		if (!rq->nr_running) {
+			prev->sched_class->put_prev_task(rq, prev,
+							 __rq_clock(rq));
 			next = rq->idle;
-			rq->expired_timestamp = 0;
-			wake_sleeping_dependent(cpu);
+			schedstat_inc(rq, sched_goidle);
 			goto switch_tasks;
 		}
 	}
 
-	array = rq->active;
-	if (unlikely(!array->nr_active)) {
-		/*
-		 * Switch the active and expired arrays.
-		 */
-		schedstat_inc(rq, sched_switch);
-		rq->active = rq->expired;
-		rq->expired = array;
-		array = rq->active;
-		rq->expired_timestamp = 0;
-		rq->best_expired_prio = MAX_PRIO;
-	}
-
-	idx = sched_find_first_bit(array->bitmap);
-	queue = array->queue + idx;
-	next = list_entry(queue->next, struct task_struct, run_list);
-
-	if (!rt_task(next) && interactive_sleep(next->sleep_type)) {
-		unsigned long long delta = now - next->timestamp;
-		if (unlikely((long long)(now - next->timestamp) < 0))
-			delta = 0;
-
-		if (next->sleep_type == SLEEP_INTERACTIVE)
-			delta = delta * (ON_RUNQUEUE_WEIGHT * 128 / 100) / 128;
-
-		array = next->array;
-		new_prio = recalc_task_prio(next, next->timestamp + delta);
-
-		if (unlikely(next->prio != new_prio)) {
-			dequeue_task(next, array);
-			next->prio = new_prio;
-			enqueue_task(next, array);
-		}
-	}
-	next->sleep_type = SLEEP_NORMAL;
-	if (rq->nr_running == 1 && dependent_sleeper(cpu, rq, next))
-		next = rq->idle;
+	next = pick_next_task(rq, prev);
+	next->nr_switches++;
+
 switch_tasks:
-	if (next == rq->idle)
-		schedstat_inc(rq, sched_goidle);
 	prefetch(next);
 	prefetch_stack(next);
 	clear_tsk_need_resched(prev);
 	rcu_qsctr_inc(task_cpu(prev));
 
-	update_cpu_clock(prev, rq, now);
-
-	prev->sleep_avg -= run_time;
-	if ((long)prev->sleep_avg <= 0)
-		prev->sleep_avg = 0;
-	prev->timestamp = prev->last_ran = now;
-
 	sched_info_switch(prev, next);
 	if (likely(prev != next)) {
-		next->timestamp = next->last_ran = now;
 		rq->nr_switches++;
 		rq->curr = next;
 		++*switch_count;
@@ -3978,29 +3249,28 @@ EXPORT_SYMBOL(sleep_on_timeout);
  */
 void rt_mutex_setprio(struct task_struct *p, int prio)
 {
-	struct prio_array *array;
 	unsigned long flags;
+	int oldprio, on_rq;
 	struct rq *rq;
-	int oldprio;
 
 	BUG_ON(prio < 0 || prio > MAX_PRIO);
 
 	rq = task_rq_lock(p, &flags);
 
 	oldprio = p->prio;
-	array = p->array;
-	if (array)
-		dequeue_task(p, array);
+	on_rq = p->on_rq;
+	if (on_rq)
+		dequeue_task(rq, p, 0);
+
+	if (rt_prio(prio))
+		p->sched_class = &rt_sched_class;
+	else
+		p->sched_class = &fair_sched_class;
+
 	p->prio = prio;
 
-	if (array) {
-		/*
-		 * If changing to an RT priority then queue it
-		 * in the active array!
-		 */
-		if (rt_task(p))
-			array = rq->active;
-		enqueue_task(p, array);
+	if (on_rq) {
+		enqueue_task(rq, p, 0);
 		/*
 		 * Reschedule if we are currently running on this runqueue and
 		 * our priority decreased, or if we are not currently running on
@@ -4009,8 +3279,9 @@ void rt_mutex_setprio(struct task_struct
 		if (task_running(rq, p)) {
 			if (p->prio > oldprio)
 				resched_task(rq->curr);
-		} else if (TASK_PREEMPTS_CURR(p, rq))
-			resched_task(rq->curr);
+		} else {
+			check_preempt_curr(rq, p);
+		}
 	}
 	task_rq_unlock(rq, &flags);
 }
@@ -4019,8 +3290,7 @@ void rt_mutex_setprio(struct task_struct
 
 void set_user_nice(struct task_struct *p, long nice)
 {
-	struct prio_array *array;
-	int old_prio, delta;
+	int old_prio, delta, on_rq;
 	unsigned long flags;
 	struct rq *rq;
 
@@ -4041,9 +3311,9 @@ void set_user_nice(struct task_struct *p
 		p->static_prio = NICE_TO_PRIO(nice);
 		goto out_unlock;
 	}
-	array = p->array;
-	if (array) {
-		dequeue_task(p, array);
+	on_rq = p->on_rq;
+	if (on_rq) {
+		dequeue_task(rq, p, 0);
 		dec_raw_weighted_load(rq, p);
 	}
 
@@ -4053,8 +3323,8 @@ void set_user_nice(struct task_struct *p
 	p->prio = effective_prio(p);
 	delta = p->prio - old_prio;
 
-	if (array) {
-		enqueue_task(p, array);
+	if (on_rq) {
+		enqueue_task(rq, p, 0);
 		inc_raw_weighted_load(rq, p);
 		/*
 		 * If the task increased its priority or is running and
@@ -4175,20 +3445,27 @@ static inline struct task_struct *find_p
 }
 
 /* Actually do priority change: must hold rq lock. */
-static void __setscheduler(struct task_struct *p, int policy, int prio)
+static void
+__setscheduler(struct rq *rq, struct task_struct *p, int policy, int prio)
 {
-	BUG_ON(p->array);
+	BUG_ON(p->on_rq);
 
 	p->policy = policy;
+	switch (p->policy) {
+	case SCHED_NORMAL:
+	case SCHED_BATCH:
+		p->sched_class = &fair_sched_class;
+		break;
+	case SCHED_FIFO:
+	case SCHED_RR:
+		p->sched_class = &rt_sched_class;
+		break;
+	}
+
 	p->rt_priority = prio;
 	p->normal_prio = normal_prio(p);
 	/* we are holding p->pi_lock already */
 	p->prio = rt_mutex_getprio(p);
-	/*
-	 * SCHED_BATCH tasks are treated as perpetual CPU hogs:
-	 */
-	if (policy == SCHED_BATCH)
-		p->sleep_avg = 0;
 	set_load_weight(p);
 }
 
@@ -4204,8 +3481,7 @@ static void __setscheduler(struct task_s
 int sched_setscheduler(struct task_struct *p, int policy,
 		       struct sched_param *param)
 {
-	int retval, oldprio, oldpolicy = -1;
-	struct prio_array *array;
+	int retval, oldprio, oldpolicy = -1, on_rq;
 	unsigned long flags;
 	struct rq *rq;
 
@@ -4279,13 +3555,13 @@ recheck:
 		spin_unlock_irqrestore(&p->pi_lock, flags);
 		goto recheck;
 	}
-	array = p->array;
-	if (array)
-		deactivate_task(p, rq);
+	on_rq = p->on_rq;
+	if (on_rq)
+		deactivate_task(rq, p, 0);
 	oldprio = p->prio;
-	__setscheduler(p, policy, param->sched_priority);
-	if (array) {
-		__activate_task(p, rq);
+	__setscheduler(rq, p, policy, param->sched_priority);
+	if (on_rq) {
+		activate_task(rq, p, 0);
 		/*
 		 * Reschedule if we are currently running on this runqueue and
 		 * our priority decreased, or if we are not currently running on
@@ -4294,8 +3570,9 @@ recheck:
 		if (task_running(rq, p)) {
 			if (p->prio > oldprio)
 				resched_task(rq->curr);
-		} else if (TASK_PREEMPTS_CURR(p, rq))
-			resched_task(rq->curr);
+		} else {
+			check_preempt_curr(rq, p);
+		}
 	}
 	__task_rq_unlock(rq);
 	spin_unlock_irqrestore(&p->pi_lock, flags);
@@ -4558,50 +3835,66 @@ asmlinkage long sys_sched_getaffinity(pi
 	if (ret < 0)
 		return ret;
 
-	if (copy_to_user(user_mask_ptr, &mask, sizeof(cpumask_t)))
-		return -EFAULT;
+	if (copy_to_user(user_mask_ptr, &mask, sizeof(cpumask_t)))
+		return -EFAULT;
+
+	return sizeof(cpumask_t);
+}
+
+/**
+ * sys_sched_yield - yield the current processor to other threads.
+ *
+ * This function yields the current CPU to other tasks. If there are no
+ * other threads running on this CPU then this function will return.
+ */
+asmlinkage long sys_sched_yield(void)
+{
+	struct rq *rq = this_rq_lock();
+
+	schedstat_inc(rq, yld_cnt);
+	if (rq->nr_running == 1)
+		schedstat_inc(rq, yld_act_empty);
+	else
+		current->sched_class->yield_task(rq, current, NULL);
+
+	/*
+	 * Since we are going to call schedule() anyway, there's
+	 * no need to preempt or enable interrupts:
+	 */
+	__release(rq->lock);
+	spin_release(&rq->lock.dep_map, 1, _THIS_IP_);
+	_raw_spin_unlock(&rq->lock);
+	preempt_enable_no_resched();
+
+	schedule();
 
-	return sizeof(cpumask_t);
+	return 0;
 }
 
 /**
- * sys_sched_yield - yield the current processor to other threads.
+ * sys_sched_yield_to - yield the current processor to another thread
  *
- * this function yields the current CPU by moving the calling thread
+ * This function yields the current CPU by moving the calling thread
  * to the expired array. If there are no other threads running on this
  * CPU then this function will return.
  */
-asmlinkage long sys_sched_yield(void)
+asmlinkage long sys_sched_yield_to(pid_t pid)
 {
-	struct rq *rq = this_rq_lock();
-	struct prio_array *array = current->array, *target = rq->expired;
+	struct task_struct *p_to;
+	struct rq *rq;
 
-	schedstat_inc(rq, yld_cnt);
-	/*
-	 * We implement yielding by moving the task into the expired
-	 * queue.
-	 *
-	 * (special rule: RT tasks will just roundrobin in the active
-	 *  array.)
-	 */
-	if (rt_task(current))
-		target = rq->active;
+	rcu_read_lock();
+	p_to = find_task_by_pid(pid);
+	if (!p_to)
+		goto out_unlock;
 
-	if (array->nr_active == 1) {
+	rq = this_rq_lock();
+
+	schedstat_inc(rq, yld_cnt);
+	if (rq->nr_running == 1)
 		schedstat_inc(rq, yld_act_empty);
-		if (!rq->expired->nr_active)
-			schedstat_inc(rq, yld_both_empty);
-	} else if (!rq->expired->nr_active)
-		schedstat_inc(rq, yld_exp_empty);
-
-	if (array != target) {
-		dequeue_task(current, array);
-		enqueue_task(current, target);
-	} else
-		/*
-		 * requeue_task is cheaper so perform that if possible.
-		 */
-		requeue_task(current, array);
+	else
+		current->sched_class->yield_task(rq, current, p_to);
 
 	/*
 	 * Since we are going to call schedule() anyway, there's
@@ -4610,13 +3903,19 @@ asmlinkage long sys_sched_yield(void)
 	__release(rq->lock);
 	spin_release(&rq->lock.dep_map, 1, _THIS_IP_);
 	_raw_spin_unlock(&rq->lock);
+	rcu_read_unlock();
 	preempt_enable_no_resched();
 
 	schedule();
 
 	return 0;
+
+out_unlock:
+	rcu_read_unlock();
+	return -ESRCH;
 }
 
+
 static void __cond_resched(void)
 {
 #ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
@@ -4812,7 +4111,7 @@ long sys_sched_rr_get_interval(pid_t pid
 		goto out_unlock;
 
 	jiffies_to_timespec(p->policy == SCHED_FIFO ?
-				0 : task_timeslice(p), &t);
+				0 : static_prio_timeslice(p->static_prio), &t);
 	read_unlock(&tasklist_lock);
 	retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0;
 out_nounlock:
@@ -4915,7 +4214,7 @@ void show_state_filter(unsigned long sta
 		 * console might take alot of time:
 		 */
 		touch_nmi_watchdog();
-		if (p->state & state_filter)
+		if (!state_filter || (p->state & state_filter))
 			show_task(p);
 	} while_each_thread(g, p);
 
@@ -4925,6 +4224,7 @@ void show_state_filter(unsigned long sta
 	 */
 	if (state_filter == -1)
 		debug_show_all_locks();
+	sysrq_sched_debug_show();
 }
 
 /**
@@ -4940,11 +4240,10 @@ void __cpuinit init_idle(struct task_str
 	struct rq *rq = cpu_rq(cpu);
 	unsigned long flags;
 
-	idle->timestamp = sched_clock();
-	idle->sleep_avg = 0;
-	idle->array = NULL;
+	__sched_fork(idle);
+	idle->exec_start = sched_clock();
+
 	idle->prio = idle->normal_prio = MAX_PRIO;
-	idle->state = TASK_RUNNING;
 	idle->cpus_allowed = cpumask_of_cpu(cpu);
 	set_task_cpu(idle, cpu);
 
@@ -5062,19 +4361,10 @@ static int __migrate_task(struct task_st
 		goto out;
 
 	set_task_cpu(p, dest_cpu);
-	if (p->array) {
-		/*
-		 * Sync timestamp with rq_dest's before activating.
-		 * The same thing could be achieved by doing this step
-		 * afterwards, and pretending it was a local activate.
-		 * This way is cleaner and logically correct.
-		 */
-		p->timestamp = p->timestamp - rq_src->most_recent_timestamp
-				+ rq_dest->most_recent_timestamp;
-		deactivate_task(p, rq_src);
-		__activate_task(p, rq_dest);
-		if (TASK_PREEMPTS_CURR(p, rq_dest))
-			resched_task(rq_dest->curr);
+	if (p->on_rq) {
+		deactivate_task(rq_src, p, 0);
+		activate_task(rq_dest, p, 0);
+		check_preempt_curr(rq_dest, p);
 	}
 	ret = 1;
 out:
@@ -5246,10 +4536,10 @@ void sched_idle_next(void)
 	 */
 	spin_lock_irqsave(&rq->lock, flags);
 
-	__setscheduler(p, SCHED_FIFO, MAX_RT_PRIO-1);
+	__setscheduler(rq, p, SCHED_FIFO, MAX_RT_PRIO-1);
 
 	/* Add idle task to the _front_ of its priority queue: */
-	__activate_idle_task(p, rq);
+	activate_idle_task(p, rq);
 
 	spin_unlock_irqrestore(&rq->lock, flags);
 }
@@ -5299,16 +4589,15 @@ static void migrate_dead(unsigned int de
 static void migrate_dead_tasks(unsigned int dead_cpu)
 {
 	struct rq *rq = cpu_rq(dead_cpu);
-	unsigned int arr, i;
+	struct task_struct *next;
 
-	for (arr = 0; arr < 2; arr++) {
-		for (i = 0; i < MAX_PRIO; i++) {
-			struct list_head *list = &rq->arrays[arr].queue[i];
-
-			while (!list_empty(list))
-				migrate_dead(dead_cpu, list_entry(list->next,
-					     struct task_struct, run_list));
-		}
+	for (;;) {
+		if (!rq->nr_running)
+			break;
+		next = pick_next_task(rq, rq->curr);
+		if (!next)
+			break;
+		migrate_dead(dead_cpu, next);
 	}
 }
 #endif /* CONFIG_HOTPLUG_CPU */
@@ -5334,7 +4623,7 @@ migration_call(struct notifier_block *nf
 		kthread_bind(p, cpu);
 		/* Must be high prio: stop_machine expects to yield to it. */
 		rq = task_rq_lock(p, &flags);
-		__setscheduler(p, SCHED_FIFO, MAX_RT_PRIO-1);
+		__setscheduler(rq, p, SCHED_FIFO, MAX_RT_PRIO-1);
 		task_rq_unlock(rq, &flags);
 		cpu_rq(cpu)->migration_thread = p;
 		break;
@@ -5362,9 +4651,9 @@ migration_call(struct notifier_block *nf
 		rq->migration_thread = NULL;
 		/* Idle task back to normal (off runqueue, low prio) */
 		rq = task_rq_lock(rq->idle, &flags);
-		deactivate_task(rq->idle, rq);
+		deactivate_task(rq, rq->idle, 0);
 		rq->idle->static_prio = MAX_PRIO;
-		__setscheduler(rq->idle, SCHED_NORMAL, 0);
+		__setscheduler(rq, rq->idle, SCHED_NORMAL, 0);
 		migrate_dead_tasks(cpu);
 		task_rq_unlock(rq, &flags);
 		migrate_nr_uninterruptible(rq);
@@ -5665,483 +4954,6 @@ init_sched_build_groups(cpumask_t span, 
 
 #define SD_NODES_PER_DOMAIN 16
 
-/*
- * Self-tuning task migration cost measurement between source and target CPUs.
- *
- * This is done by measuring the cost of manipulating buffers of varying
- * sizes. For a given buffer-size here are the steps that are taken:
- *
- * 1) the source CPU reads+dirties a shared buffer
- * 2) the target CPU reads+dirties the same shared buffer
- *
- * We measure how long they take, in the following 4 scenarios:
- *
- *  - source: CPU1, target: CPU2 | cost1
- *  - source: CPU2, target: CPU1 | cost2
- *  - source: CPU1, target: CPU1 | cost3
- *  - source: CPU2, target: CPU2 | cost4
- *
- * We then calculate the cost3+cost4-cost1-cost2 difference - this is
- * the cost of migration.
- *
- * We then start off from a small buffer-size and iterate up to larger
- * buffer sizes, in 5% steps - measuring each buffer-size separately, and
- * doing a maximum search for the cost. (The maximum cost for a migration
- * normally occurs when the working set size is around the effective cache
- * size.)
- */
-#define SEARCH_SCOPE		2
-#define MIN_CACHE_SIZE		(64*1024U)
-#define DEFAULT_CACHE_SIZE	(5*1024*1024U)
-#define ITERATIONS		1
-#define SIZE_THRESH		130
-#define COST_THRESH		130
-
-/*
- * The migration cost is a function of 'domain distance'. Domain
- * distance is the number of steps a CPU has to iterate down its
- * domain tree to share a domain with the other CPU. The farther
- * two CPUs are from each other, the larger the distance gets.
- *
- * Note that we use the distance only to cache measurement results,
- * the distance value is not used numerically otherwise. When two
- * CPUs have the same distance it is assumed that the migration
- * cost is the same. (this is a simplification but quite practical)
- */
-#define MAX_DOMAIN_DISTANCE 32
-
-static unsigned long long migration_cost[MAX_DOMAIN_DISTANCE] =
-		{ [ 0 ... MAX_DOMAIN_DISTANCE-1 ] =
-/*
- * Architectures may override the migration cost and thus avoid
- * boot-time calibration. Unit is nanoseconds. Mostly useful for
- * virtualized hardware:
- */
-#ifdef CONFIG_DEFAULT_MIGRATION_COST
-			CONFIG_DEFAULT_MIGRATION_COST
-#else
-			-1LL
-#endif
-};
-
-/*
- * Allow override of migration cost - in units of microseconds.
- * E.g. migration_cost=1000,2000,3000 will set up a level-1 cost
- * of 1 msec, level-2 cost of 2 msecs and level3 cost of 3 msecs:
- */
-static int __init migration_cost_setup(char *str)
-{
-	int ints[MAX_DOMAIN_DISTANCE+1], i;
-
-	str = get_options(str, ARRAY_SIZE(ints), ints);
-
-	printk("#ints: %d\n", ints[0]);
-	for (i = 1; i <= ints[0]; i++) {
-		migration_cost[i-1] = (unsigned long long)ints[i]*1000;
-		printk("migration_cost[%d]: %Ld\n", i-1, migration_cost[i-1]);
-	}
-	return 1;
-}
-
-__setup ("migration_cost=", migration_cost_setup);
-
-/*
- * Global multiplier (divisor) for migration-cutoff values,
- * in percentiles. E.g. use a value of 150 to get 1.5 times
- * longer cache-hot cutoff times.
- *
- * (We scale it from 100 to 128 to long long handling easier.)
- */
-
-#define MIGRATION_FACTOR_SCALE 128
-
-static unsigned int migration_factor = MIGRATION_FACTOR_SCALE;
-
-static int __init setup_migration_factor(char *str)
-{
-	get_option(&str, &migration_factor);
-	migration_factor = migration_factor * MIGRATION_FACTOR_SCALE / 100;
-	return 1;
-}
-
-__setup("migration_factor=", setup_migration_factor);
-
-/*
- * Estimated distance of two CPUs, measured via the number of domains
- * we have to pass for the two CPUs to be in the same span:
- */
-static unsigned long domain_distance(int cpu1, int cpu2)
-{
-	unsigned long distance = 0;
-	struct sched_domain *sd;
-
-	for_each_domain(cpu1, sd) {
-		WARN_ON(!cpu_isset(cpu1, sd->span));
-		if (cpu_isset(cpu2, sd->span))
-			return distance;
-		distance++;
-	}
-	if (distance >= MAX_DOMAIN_DISTANCE) {
-		WARN_ON(1);
-		distance = MAX_DOMAIN_DISTANCE-1;
-	}
-
-	return distance;
-}
-
-static unsigned int migration_debug;
-
-static int __init setup_migration_debug(char *str)
-{
-	get_option(&str, &migration_debug);
-	return 1;
-}
-
-__setup("migration_debug=", setup_migration_debug);
-
-/*
- * Maximum cache-size that the scheduler should try to measure.
- * Architectures with larger caches should tune this up during
- * bootup. Gets used in the domain-setup code (i.e. during SMP
- * bootup).
- */
-unsigned int max_cache_size;
-
-static int __init setup_max_cache_size(char *str)
-{
-	get_option(&str, &max_cache_size);
-	return 1;
-}
-
-__setup("max_cache_size=", setup_max_cache_size);
-
-/*
- * Dirty a big buffer in a hard-to-predict (for the L2 cache) way. This
- * is the operation that is timed, so we try to generate unpredictable
- * cachemisses that still end up filling the L2 cache:
- */
-static void touch_cache(void *__cache, unsigned long __size)
-{
-	unsigned long size = __size / sizeof(long);
-	unsigned long chunk1 = size / 3;
-	unsigned long chunk2 = 2 * size / 3;
-	unsigned long *cache = __cache;
-	int i;
-
-	for (i = 0; i < size/6; i += 8) {
-		switch (i % 6) {
-			case 0: cache[i]++;
-			case 1: cache[size-1-i]++;
-			case 2: cache[chunk1-i]++;
-			case 3: cache[chunk1+i]++;
-			case 4: cache[chunk2-i]++;
-			case 5: cache[chunk2+i]++;
-		}
-	}
-}
-
-/*
- * Measure the cache-cost of one task migration. Returns in units of nsec.
- */
-static unsigned long long
-measure_one(void *cache, unsigned long size, int source, int target)
-{
-	cpumask_t mask, saved_mask;
-	unsigned long long t0, t1, t2, t3, cost;
-
-	saved_mask = current->cpus_allowed;
-
-	/*
-	 * Flush source caches to RAM and invalidate them:
-	 */
-	sched_cacheflush();
-
-	/*
-	 * Migrate to the source CPU:
-	 */
-	mask = cpumask_of_cpu(source);
-	set_cpus_allowed(current, mask);
-	WARN_ON(smp_processor_id() != source);
-
-	/*
-	 * Dirty the working set:
-	 */
-	t0 = sched_clock();
-	touch_cache(cache, size);
-	t1 = sched_clock();
-
-	/*
-	 * Migrate to the target CPU, dirty the L2 cache and access
-	 * the shared buffer. (which represents the working set
-	 * of a migrated task.)
-	 */
-	mask = cpumask_of_cpu(target);
-	set_cpus_allowed(current, mask);
-	WARN_ON(smp_processor_id() != target);
-
-	t2 = sched_clock();
-	touch_cache(cache, size);
-	t3 = sched_clock();
-
-	cost = t1-t0 + t3-t2;
-
-	if (migration_debug >= 2)
-		printk("[%d->%d]: %8Ld %8Ld %8Ld => %10Ld.\n",
-			source, target, t1-t0, t1-t0, t3-t2, cost);
-	/*
-	 * Flush target caches to RAM and invalidate them:
-	 */
-	sched_cacheflush();
-
-	set_cpus_allowed(current, saved_mask);
-
-	return cost;
-}
-
-/*
- * Measure a series of task migrations and return the average
- * result. Since this code runs early during bootup the system
- * is 'undisturbed' and the average latency makes sense.
- *
- * The algorithm in essence auto-detects the relevant cache-size,
- * so it will properly detect different cachesizes for different
- * cache-hierarchies, depending on how the CPUs are connected.
- *
- * Architectures can prime the upper limit of the search range via
- * max_cache_size, otherwise the search range defaults to 20MB...64K.
- */
-static unsigned long long
-measure_cost(int cpu1, int cpu2, void *cache, unsigned int size)
-{
-	unsigned long long cost1, cost2;
-	int i;
-
-	/*
-	 * Measure the migration cost of 'size' bytes, over an
-	 * average of 10 runs:
-	 *
-	 * (We perturb the cache size by a small (0..4k)
-	 *  value to compensate size/alignment related artifacts.
-	 *  We also subtract the cost of the operation done on
-	 *  the same CPU.)
-	 */
-	cost1 = 0;
-
-	/*
-	 * dry run, to make sure we start off cache-cold on cpu1,
-	 * and to get any vmalloc pagefaults in advance:
-	 */
-	measure_one(cache, size, cpu1, cpu2);
-	for (i = 0; i < ITERATIONS; i++)
-		cost1 += measure_one(cache, size - i * 1024, cpu1, cpu2);
-
-	measure_one(cache, size, cpu2, cpu1);
-	for (i = 0; i < ITERATIONS; i++)
-		cost1 += measure_one(cache, size - i * 1024, cpu2, cpu1);
-
-	/*
-	 * (We measure the non-migrating [cached] cost on both
-	 *  cpu1 and cpu2, to handle CPUs with different speeds)
-	 */
-	cost2 = 0;
-
-	measure_one(cache, size, cpu1, cpu1);
-	for (i = 0; i < ITERATIONS; i++)
-		cost2 += measure_one(cache, size - i * 1024, cpu1, cpu1);
-
-	measure_one(cache, size, cpu2, cpu2);
-	for (i = 0; i < ITERATIONS; i++)
-		cost2 += measure_one(cache, size - i * 1024, cpu2, cpu2);
-
-	/*
-	 * Get the per-iteration migration cost:
-	 */
-	do_div(cost1, 2 * ITERATIONS);
-	do_div(cost2, 2 * ITERATIONS);
-
-	return cost1 - cost2;
-}
-
-static unsigned long long measure_migration_cost(int cpu1, int cpu2)
-{
-	unsigned long long max_cost = 0, fluct = 0, avg_fluct = 0;
-	unsigned int max_size, size, size_found = 0;
-	long long cost = 0, prev_cost;
-	void *cache;
-
-	/*
-	 * Search from max_cache_size*5 down to 64K - the real relevant
-	 * cachesize has to lie somewhere inbetween.
-	 */
-	if (max_cache_size) {
-		max_size = max(max_cache_size * SEARCH_SCOPE, MIN_CACHE_SIZE);
-		size = max(max_cache_size / SEARCH_SCOPE, MIN_CACHE_SIZE);
-	} else {
-		/*
-		 * Since we have no estimation about the relevant
-		 * search range
-		 */
-		max_size = DEFAULT_CACHE_SIZE * SEARCH_SCOPE;
-		size = MIN_CACHE_SIZE;
-	}
-
-	if (!cpu_online(cpu1) || !cpu_online(cpu2)) {
-		printk("cpu %d and %d not both online!\n", cpu1, cpu2);
-		return 0;
-	}
-
-	/*
-	 * Allocate the working set:
-	 */
-	cache = vmalloc(max_size);
-	if (!cache) {
-		printk("could not vmalloc %d bytes for cache!\n", 2 * max_size);
-		return 1000000; /* return 1 msec on very small boxen */
-	}
-
-	while (size <= max_size) {
-		prev_cost = cost;
-		cost = measure_cost(cpu1, cpu2, cache, size);
-
-		/*
-		 * Update the max:
-		 */
-		if (cost > 0) {
-			if (max_cost < cost) {
-				max_cost = cost;
-				size_found = size;
-			}
-		}
-		/*
-		 * Calculate average fluctuation, we use this to prevent
-		 * noise from triggering an early break out of the loop:
-		 */
-		fluct = abs(cost - prev_cost);
-		avg_fluct = (avg_fluct + fluct)/2;
-
-		if (migration_debug)
-			printk("-> [%d][%d][%7d] %3ld.%ld [%3ld.%ld] (%ld): "
-				"(%8Ld %8Ld)\n",
-				cpu1, cpu2, size,
-				(long)cost / 1000000,
-				((long)cost / 100000) % 10,
-				(long)max_cost / 1000000,
-				((long)max_cost / 100000) % 10,
-				domain_distance(cpu1, cpu2),
-				cost, avg_fluct);
-
-		/*
-		 * If we iterated at least 20% past the previous maximum,
-		 * and the cost has dropped by more than 20% already,
-		 * (taking fluctuations into account) then we assume to
-		 * have found the maximum and break out of the loop early:
-		 */
-		if (size_found && (size*100 > size_found*SIZE_THRESH))
-			if (cost+avg_fluct <= 0 ||
-				max_cost*100 > (cost+avg_fluct)*COST_THRESH) {
-
-				if (migration_debug)
-					printk("-> found max.\n");
-				break;
-			}
-		/*
-		 * Increase the cachesize in 10% steps:
-		 */
-		size = size * 10 / 9;
-	}
-
-	if (migration_debug)
-		printk("[%d][%d] working set size found: %d, cost: %Ld\n",
-			cpu1, cpu2, size_found, max_cost);
-
-	vfree(cache);
-
-	/*
-	 * A task is considered 'cache cold' if at least 2 times
-	 * the worst-case cost of migration has passed.
-	 *
-	 * (this limit is only listened to if the load-balancing
-	 * situation is 'nice' - if there is a large imbalance we
-	 * ignore it for the sake of CPU utilization and
-	 * processing fairness.)
-	 */
-	return 2 * max_cost * migration_factor / MIGRATION_FACTOR_SCALE;
-}
-
-static void calibrate_migration_costs(const cpumask_t *cpu_map)
-{
-	int cpu1 = -1, cpu2 = -1, cpu, orig_cpu = raw_smp_processor_id();
-	unsigned long j0, j1, distance, max_distance = 0;
-	struct sched_domain *sd;
-
-	j0 = jiffies;
-
-	/*
-	 * First pass - calculate the cacheflush times:
-	 */
-	for_each_cpu_mask(cpu1, *cpu_map) {
-		for_each_cpu_mask(cpu2, *cpu_map) {
-			if (cpu1 == cpu2)
-				continue;
-			distance = domain_distance(cpu1, cpu2);
-			max_distance = max(max_distance, distance);
-			/*
-			 * No result cached yet?
-			 */
-			if (migration_cost[distance] == -1LL)
-				migration_cost[distance] =
-					measure_migration_cost(cpu1, cpu2);
-		}
-	}
-	/*
-	 * Second pass - update the sched domain hierarchy with
-	 * the new cache-hot-time estimations:
-	 */
-	for_each_cpu_mask(cpu, *cpu_map) {
-		distance = 0;
-		for_each_domain(cpu, sd) {
-			sd->cache_hot_time = migration_cost[distance];
-			distance++;
-		}
-	}
-	/*
-	 * Print the matrix:
-	 */
-	if (migration_debug)
-		printk("migration: max_cache_size: %d, cpu: %d MHz:\n",
-			max_cache_size,
-#ifdef CONFIG_X86
-			cpu_khz/1000
-#else
-			-1
-#endif
-		);
-	if (system_state == SYSTEM_BOOTING && num_online_cpus() > 1) {
-		printk("migration_cost=");
-		for (distance = 0; distance <= max_distance; distance++) {
-			if (distance)
-				printk(",");
-			printk("%ld", (long)migration_cost[distance] / 1000);
-		}
-		printk("\n");
-	}
-	j1 = jiffies;
-	if (migration_debug)
-		printk("migration: %ld seconds\n", (j1-j0) / HZ);
-
-	/*
-	 * Move back to the original CPU. NUMA-Q gets confused
-	 * if we migrate to another quad during bootup.
-	 */
-	if (raw_smp_processor_id() != orig_cpu) {
-		cpumask_t mask = cpumask_of_cpu(orig_cpu),
-			saved_mask = current->cpus_allowed;
-
-		set_cpus_allowed(current, mask);
-		set_cpus_allowed(current, saved_mask);
-	}
-}
-
 #ifdef CONFIG_NUMA
 
 /**
@@ -6671,10 +5483,6 @@ static int build_sched_domains(const cpu
 #endif
 		cpu_attach_domain(sd, i);
 	}
-	/*
-	 * Tune cache-hot values:
-	 */
-	calibrate_migration_costs(cpu_map);
 
 	return 0;
 
@@ -6875,6 +5683,16 @@ void __init sched_init_smp(void)
 	/* Move init over to a non-isolated CPU */
 	if (set_cpus_allowed(current, non_isolated_cpus) < 0)
 		BUG();
+	/*
+	 * Increase the granularity value when there are more CPUs,
+	 * because with more CPUs the 'effective latency' as visible
+	 * to users decreases. But the relationship is not linear,
+	 * so pick a second-best guess by going with the log2 of the
+	 * number of CPUs.
+	 *
+	 * This idea comes from the SD scheduler of Con Kolivas:
+	 */
+	sysctl_sched_granularity *= 1 + ilog2(num_online_cpus());
 }
 #else
 void __init sched_init_smp(void)
@@ -6894,7 +5712,14 @@ int in_sched_functions(unsigned long add
 
 void __init sched_init(void)
 {
-	int i, j, k;
+	int i, j;
+
+	current->sched_class = &fair_sched_class;
+	/*
+	 * Link up the scheduling class hierarchy:
+	 */
+	rt_sched_class.next = &fair_sched_class;
+	fair_sched_class.next = NULL;
 
 	for_each_possible_cpu(i) {
 		struct prio_array *array;
@@ -6904,14 +5729,13 @@ void __init sched_init(void)
 		spin_lock_init(&rq->lock);
 		lockdep_set_class(&rq->lock, &rq->rq_lock_key);
 		rq->nr_running = 0;
-		rq->active = rq->arrays;
-		rq->expired = rq->arrays + 1;
-		rq->best_expired_prio = MAX_PRIO;
+		rq->tasks_timeline = RB_ROOT;
+		rq->clock = rq->fair_clock = 1;
 
+		for (j = 0; j < CPU_LOAD_IDX_MAX; j++)
+			rq->cpu_load[j] = 0;
 #ifdef CONFIG_SMP
 		rq->sd = NULL;
-		for (j = 1; j < 3; j++)
-			rq->cpu_load[j] = 0;
 		rq->active_balance = 0;
 		rq->push_cpu = 0;
 		rq->cpu = i;
@@ -6920,15 +5744,13 @@ void __init sched_init(void)
 #endif
 		atomic_set(&rq->nr_iowait, 0);
 
-		for (j = 0; j < 2; j++) {
-			array = rq->arrays + j;
-			for (k = 0; k < MAX_PRIO; k++) {
-				INIT_LIST_HEAD(array->queue + k);
-				__clear_bit(k, array->bitmap);
-			}
-			// delimiter for bitsearch
-			__set_bit(MAX_PRIO, array->bitmap);
+		array = &rq->active;
+		for (j = 0; j < MAX_RT_PRIO; j++) {
+			INIT_LIST_HEAD(array->queue + j);
+			__clear_bit(j, array->bitmap);
 		}
+		/* delimiter for bitsearch: */
+		__set_bit(MAX_RT_PRIO, array->bitmap);
 	}
 
 	set_load_weight(&init_task);
@@ -6984,28 +5806,54 @@ EXPORT_SYMBOL(__might_sleep);
 #ifdef CONFIG_MAGIC_SYSRQ
 void normalize_rt_tasks(void)
 {
-	struct prio_array *array;
 	struct task_struct *p;
 	unsigned long flags;
 	struct rq *rq;
+	int on_rq;
 
 	read_lock_irq(&tasklist_lock);
 	for_each_process(p) {
-		if (!rt_task(p))
+		p->fair_key = 0;
+		p->wait_runtime = 0;
+		p->wait_start_fair = 0;
+		p->wait_start = 0;
+		p->exec_start = 0;
+		p->sleep_start = 0;
+		p->block_start = 0;
+		task_rq(p)->fair_clock = 0;
+		task_rq(p)->clock = 0;
+
+		if (!rt_task(p)) {
+			/*
+			 * Renice negative nice level userspace
+			 * tasks back to 0:
+			 */
+			if (TASK_NICE(p) < 0 && p->mm)
+				set_user_nice(p, 0);
 			continue;
+		}
 
 		spin_lock_irqsave(&p->pi_lock, flags);
 		rq = __task_rq_lock(p);
+#ifdef CONFIG_SMP
+		/*
+		 * Do not touch the migration thread:
+		 */
+		if (p == rq->migration_thread)
+			goto out_unlock;
+#endif
 
-		array = p->array;
-		if (array)
-			deactivate_task(p, task_rq(p));
-		__setscheduler(p, SCHED_NORMAL, 0);
-		if (array) {
-			__activate_task(p, task_rq(p));
+		on_rq = p->on_rq;
+		if (on_rq)
+			deactivate_task(task_rq(p), p, 0);
+		__setscheduler(rq, p, SCHED_NORMAL, 0);
+		if (on_rq) {
+			activate_task(task_rq(p), p, 0);
 			resched_task(rq->curr);
 		}
-
+#ifdef CONFIG_SMP
+ out_unlock:
+#endif
 		__task_rq_unlock(rq);
 		spin_unlock_irqrestore(&p->pi_lock, flags);
 	}
Index: linux-cfs-2.6.20.8.q/kernel/sched_debug.c
===================================================================
--- /dev/null
+++ linux-cfs-2.6.20.8.q/kernel/sched_debug.c
@@ -0,0 +1,161 @@
+/*
+ * kernel/time/sched_debug.c
+ *
+ * Print the CFS rbtree
+ *
+ * Copyright(C) 2007, Red Hat, Inc., Ingo Molnar
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/sched.h>
+#include <linux/seq_file.h>
+#include <linux/kallsyms.h>
+#include <linux/ktime.h>
+
+#include <asm/uaccess.h>
+
+typedef void (*print_fn_t)(struct seq_file *m, unsigned int *classes);
+
+/*
+ * This allows printing both to /proc/sched_debug and
+ * to the console
+ */
+#define SEQ_printf(m, x...)			\
+ do {						\
+	if (m)					\
+		seq_printf(m, x);		\
+	else					\
+		printk(x);			\
+ } while (0)
+
+static void
+print_task(struct seq_file *m, struct rq *rq, struct task_struct *p, u64 now)
+{
+	if (rq->curr == p)
+		SEQ_printf(m, "R");
+	else
+		SEQ_printf(m, " ");
+
+	SEQ_printf(m, "%14s %5d %15Ld %13Ld %13Ld %9Ld %5d "
+		      "%15Ld %15Ld %15Ld\n",
+		p->comm, p->pid,
+		(long long)p->fair_key, (long long)p->fair_key - rq->fair_clock,
+		(long long)p->wait_runtime,
+		(long long)p->nr_switches,
+		p->prio,
+		(long long)p->wait_start_fair - rq->fair_clock,
+		(long long)p->sum_exec_runtime,
+		(long long)p->sum_wait_runtime);
+}
+
+static void print_rq(struct seq_file *m, struct rq *rq, u64 now)
+{
+	struct task_struct *p;
+	struct rb_node *curr;
+
+	SEQ_printf(m,
+	"\nrunnable tasks:\n"
+	"           task   PID        tree-key         delta       waiting"
+	"  switches  prio     wstart-fair"
+	"        sum-exec        sum-wait\n"
+	"-----------------------------------------------------------------"
+	"--------------------------------"
+	"--------------------------------\n");
+
+	curr = first_fair(rq);
+	while (curr) {
+		p = rb_entry(curr, struct task_struct, run_node);
+		print_task(m, rq, p, now);
+
+		curr = rb_next(curr);
+	}
+}
+
+static void print_cpu(struct seq_file *m, int cpu, u64 now)
+{
+	struct rq *rq = &per_cpu(runqueues, cpu);
+
+	SEQ_printf(m, "\ncpu: %d\n", cpu);
+#define P(x) \
+	SEQ_printf(m, "  .%-22s: %Lu\n", #x, (unsigned long long)(rq->x))
+
+	P(nr_running);
+	P(raw_weighted_load);
+	P(nr_switches);
+	P(nr_load_updates);
+	P(nr_uninterruptible);
+	P(next_balance);
+	P(curr->pid);
+	P(clock);
+	P(prev_clock_raw);
+	P(clock_warps);
+	P(clock_unstable_events);
+	P(clock_max_delta);
+	rq->clock_max_delta = 0;
+	P(fair_clock);
+	P(prev_fair_clock);
+	P(exec_clock);
+	P(prev_exec_clock);
+	P(wait_runtime);
+	P(cpu_load[0]);
+	P(cpu_load[1]);
+	P(cpu_load[2]);
+	P(cpu_load[3]);
+	P(cpu_load[4]);
+#undef P
+
+	print_rq(m, rq, now);
+}
+
+static int sched_debug_show(struct seq_file *m, void *v)
+{
+	u64 now = ktime_to_ns(ktime_get());
+	int cpu;
+
+	SEQ_printf(m, "Sched Debug Version: v0.02\n");
+	SEQ_printf(m, "now at %Lu nsecs\n", (unsigned long long)now);
+
+	for_each_online_cpu(cpu)
+		print_cpu(m, cpu, now);
+
+	SEQ_printf(m, "\n");
+
+	return 0;
+}
+
+void sysrq_sched_debug_show(void)
+{
+	sched_debug_show(NULL, NULL);
+}
+
+static int sched_debug_open(struct inode *inode, struct file *filp)
+{
+	return single_open(filp, sched_debug_show, NULL);
+}
+
+static struct file_operations sched_debug_fops = {
+	.open		= sched_debug_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+static int __init init_sched_debug_procfs(void)
+{
+	struct proc_dir_entry *pe;
+
+	pe = create_proc_entry("sched_debug", 0644, NULL);
+	if (!pe)
+		return -ENOMEM;
+
+	pe->proc_fops = &sched_debug_fops;
+
+	return 0;
+}
+__initcall(init_sched_debug_procfs);
Index: linux-cfs-2.6.20.8.q/kernel/sched_fair.c
===================================================================
--- /dev/null
+++ linux-cfs-2.6.20.8.q/kernel/sched_fair.c
@@ -0,0 +1,618 @@
+/*
+ * Completely Fair Scheduling (CFS) Class (SCHED_NORMAL/SCHED_BATCH)
+ */
+
+/*
+ * Preemption granularity:
+ * (default: 2 msec, units: nanoseconds)
+ *
+ * NOTE: this granularity value is not the same as the concept of
+ * 'timeslice length' - timeslices in CFS will typically be somewhat
+ * larger than this value. (to see the precise effective timeslice
+ * length of your workload, run vmstat and monitor the context-switches
+ * field)
+ *
+ * On SMP systems the value of this is multiplied by the log2 of the
+ * number of CPUs. (i.e. factor 2x on 2-way systems, 3x on 4-way
+ * systems, 4x on 8-way systems, 5x on 16-way systems, etc.)
+ */
+unsigned int sysctl_sched_granularity __read_mostly = 2000000;
+
+unsigned int sysctl_sched_sleep_history_max __read_mostly = 2000000000;
+
+unsigned int sysctl_sched_load_smoothing = 2;
+
+/*
+ * Wake-up granularity.
+ * (default: 1 msec, units: nanoseconds)
+ *
+ * This option delays the preemption effects of decoupled workloads
+ * and reduces their over-scheduling. Synchronous workloads will still
+ * have immediate wakeup/sleep latencies.
+ */
+unsigned int sysctl_sched_wakeup_granularity __read_mostly = 0;
+
+
+extern struct sched_class fair_sched_class;
+
+/**************************************************************/
+/* Scheduling class tree data structure manipulation methods:
+ */
+
+/*
+ * Enqueue a task into the rb-tree:
+ */
+static inline void __enqueue_task_fair(struct rq *rq, struct task_struct *p)
+{
+	struct rb_node **link = &rq->tasks_timeline.rb_node;
+	struct rb_node *parent = NULL;
+	struct task_struct *entry;
+	s64 key = p->fair_key;
+	int leftmost = 1;
+
+	/*
+	 * Find the right place in the rbtree:
+	 */
+	while (*link) {
+		parent = *link;
+		entry = rb_entry(parent, struct task_struct, run_node);
+		/*
+		 * We dont care about collisions. Nodes with
+		 * the same key stay together.
+		 */
+		if (key < entry->fair_key) {
+			link = &parent->rb_left;
+		} else {
+			link = &parent->rb_right;
+			leftmost = 0;
+		}
+	}
+
+	/*
+	 * Maintain a cache of leftmost tree entries (it is frequently
+	 * used):
+	 */
+	if (leftmost)
+		rq->rb_leftmost = &p->run_node;
+
+	rb_link_node(&p->run_node, parent, link);
+	rb_insert_color(&p->run_node, &rq->tasks_timeline);
+}
+
+static inline void __dequeue_task_fair(struct rq *rq, struct task_struct *p)
+{
+	if (rq->rb_leftmost == &p->run_node)
+		rq->rb_leftmost = NULL;
+	rb_erase(&p->run_node, &rq->tasks_timeline);
+}
+
+static inline struct rb_node * first_fair(struct rq *rq)
+{
+	if (rq->rb_leftmost)
+		return rq->rb_leftmost;
+	/* Cache the value returned by rb_first() */
+	rq->rb_leftmost = rb_first(&rq->tasks_timeline);
+	return rq->rb_leftmost;
+}
+
+static struct task_struct * __pick_next_task_fair(struct rq *rq)
+{
+	return rb_entry(first_fair(rq), struct task_struct, run_node);
+}
+
+/**************************************************************/
+/* Scheduling class statistics methods:
+ */
+
+static inline u64
+rescale_load(struct task_struct *p, u64 value)
+{
+	int load_shift = p->load_shift;
+
+	if (load_shift == SCHED_LOAD_SHIFT)
+		return value;
+
+	return (value << load_shift) >> SCHED_LOAD_SHIFT;
+}
+
+static u64
+niced_granularity(struct rq *rq, struct task_struct *curr,
+		  unsigned long granularity)
+{
+	return rescale_load(curr, granularity);
+}
+
+/*
+ * Update the current task's runtime statistics. Skip current tasks that
+ * are not in our scheduling class.
+ */
+static inline void update_curr(struct rq *rq, u64 now)
+{
+	u64 delta_exec, delta_fair, delta_mine;
+	struct task_struct *curr = rq->curr;
+	unsigned long load;
+
+	if (curr->sched_class != &fair_sched_class || curr == rq->idle
+			|| !curr->on_rq)
+		return;
+	/*
+	 * Get the amount of time the current task was running
+	 * since the last time we changed raw_weighted_load:
+	 */
+	delta_exec = now - curr->exec_start;
+	if (unlikely(delta_exec > curr->exec_max))
+		curr->exec_max = delta_exec;
+
+	if (sysctl_sched_load_smoothing) {
+		delta_fair = delta_exec << SCHED_LOAD_SHIFT;
+		do_div(delta_fair, rq->raw_weighted_load);
+
+		load = rq->cpu_load[CPU_LOAD_IDX_MAX-1] + 1;
+		if (sysctl_sched_load_smoothing & 2)
+			load = max(load, rq->raw_weighted_load);
+
+		delta_mine = delta_exec << curr->load_shift;
+		do_div(delta_mine, load);
+	} else {
+		delta_fair = delta_exec << SCHED_LOAD_SHIFT;
+		do_div(delta_fair, rq->raw_weighted_load);
+
+		delta_mine = delta_exec << curr->load_shift;
+		do_div(delta_mine, rq->raw_weighted_load);
+	}
+
+	curr->sum_exec_runtime += delta_exec;
+	curr->exec_start = now;
+
+	rq->fair_clock += delta_fair;
+	rq->exec_clock += delta_exec;
+
+	/*
+	 * We executed delta_exec amount of time on the CPU,
+	 * but we were only entitled to delta_mine amount of
+	 * time during that period (if nr_running == 1 then
+	 * the two values are equal):
+	 */
+
+	/*
+	 * Task already marked for preemption, do not burden
+	 * it with the cost of not having left the CPU yet.
+	 */
+	if (unlikely(test_tsk_thread_flag(curr, TIF_NEED_RESCHED)))
+		goto out_nowait;
+
+	curr->wait_runtime -= delta_exec - delta_mine;
+	if (unlikely(curr->wait_runtime < curr->min_wait_runtime))
+		curr->min_wait_runtime = curr->wait_runtime;
+
+	rq->wait_runtime -= delta_exec - delta_mine;
+out_nowait:
+	;
+}
+
+static inline void
+update_stats_wait_start(struct rq *rq, struct task_struct *p, u64 now)
+{
+	p->wait_start_fair = rq->fair_clock;
+	p->wait_start = now;
+}
+
+/*
+ * Task is being enqueued - update stats:
+ */
+static inline void
+update_stats_enqueue(struct rq *rq, struct task_struct *p, u64 now)
+{
+	s64 key;
+
+	/*
+	 * Update the fair clock.
+	 */
+	update_curr(rq, now);
+
+	/*
+	 * Are we enqueueing a waiting task? (for current tasks
+	 * a dequeue/enqueue event is a NOP)
+	 */
+	if (p != rq->curr)
+		update_stats_wait_start(rq, p, now);
+	/*
+	 * Update the key:
+	 */
+	key = rq->fair_clock;
+
+	/*
+	 * Optimize the common nice 0 case:
+	 */
+	if (likely(p->load_shift == SCHED_LOAD_SHIFT)) {
+		key -= p->wait_runtime;
+	} else {
+		unsigned int delta_bits;
+
+		if (p->load_shift < SCHED_LOAD_SHIFT) {
+			/* plus-reniced tasks get helped: */
+			delta_bits = SCHED_LOAD_SHIFT - p->load_shift;
+			key -= p->wait_runtime << delta_bits;
+		} else {
+			/* negative-reniced tasks get hurt: */
+			delta_bits = p->load_shift - SCHED_LOAD_SHIFT;
+			key -= p->wait_runtime >> delta_bits;
+		}
+	}
+
+	p->fair_key = key;
+}
+
+/*
+ * Note: must be called with a freshly updated rq->fair_clock.
+ */
+static inline void
+update_stats_wait_end(struct rq *rq, struct task_struct *p, u64 now)
+{
+	u64 delta, fair_delta, delta_wait;
+
+	delta_wait = now - p->wait_start;
+	if (unlikely(delta_wait > p->wait_max))
+		p->wait_max = delta_wait;
+
+	delta = rq->fair_clock - p->wait_start_fair;
+	fair_delta = rescale_load(p, delta);
+
+	p->sum_wait_runtime += fair_delta;
+	rq->wait_runtime += fair_delta;
+	p->wait_runtime += fair_delta;
+
+	p->wait_start_fair = 0;
+	p->wait_start = 0;
+}
+
+static inline void
+update_stats_dequeue(struct rq *rq, struct task_struct *p, u64 now)
+{
+	update_curr(rq, now);
+	/*
+	 * Mark the end of the wait period if dequeueing a
+	 * waiting task:
+	 */
+	if (p != rq->curr)
+		update_stats_wait_end(rq, p, now);
+}
+
+/*
+ * We are picking a new current task - update its stats:
+ */
+static inline void
+update_stats_curr_start(struct rq *rq, struct task_struct *p, u64 now)
+{
+	/*
+	 * We are starting a new run period:
+	 */
+	p->exec_start = now;
+}
+
+/*
+ * We are descheduling a task - update its stats:
+ */
+static inline void
+update_stats_curr_end(struct rq *rq, struct task_struct *p, u64 now)
+{
+	update_curr(rq, now);
+
+	p->exec_start = 0;
+}
+
+/**************************************************************/
+/* Scheduling class queueing methods:
+ */
+
+/*
+ * The enqueue_task method is called before nr_running is
+ * increased. Here we update the fair scheduling stats and
+ * then put the task into the rbtree:
+ */
+static void
+enqueue_task_fair(struct rq *rq, struct task_struct *p, int wakeup, u64 now)
+{
+	unsigned long max_delta = sysctl_sched_sleep_history_max, factor;
+	u64 delta = 0;
+
+	if (wakeup) {
+		if (p->sleep_start) {
+			delta = now - p->sleep_start;
+			if ((s64)delta < 0)
+				delta = 0;
+
+			if (unlikely(delta > p->sleep_max))
+				p->sleep_max = delta;
+
+			p->sleep_start = 0;
+		}
+		if (p->block_start) {
+			delta = now - p->block_start;
+			if ((s64)delta < 0)
+				delta = 0;
+
+			if (unlikely(delta > p->block_max))
+				p->block_max = delta;
+
+			p->block_start = 0;
+		}
+
+		/*
+		 * We are after a wait period, decay the
+		 * wait_runtime value:
+		 */
+		if (max_delta != -1 && max_delta != -2) {
+			if (delta < max_delta) {
+				factor = 1024 * (max_delta -
+					(unsigned long)delta) / max_delta;
+				p->wait_runtime *= (int)factor;
+				p->wait_runtime /= 1024;
+			} else {
+				p->wait_runtime = 0;
+			}
+		}
+	}
+	update_stats_enqueue(rq, p, now);
+	if (wakeup && max_delta == -2)
+		p->wait_runtime = 0;
+	__enqueue_task_fair(rq, p);
+}
+
+/*
+ * The dequeue_task method is called before nr_running is
+ * decreased. We remove the task from the rbtree and
+ * update the fair scheduling stats:
+ */
+static void
+dequeue_task_fair(struct rq *rq, struct task_struct *p, int sleep, u64 now)
+{
+	update_stats_dequeue(rq, p, now);
+	if (sleep) {
+		if (p->state & TASK_INTERRUPTIBLE)
+			p->sleep_start = now;
+		if (p->state & TASK_UNINTERRUPTIBLE)
+			p->block_start = now;
+	}
+	__dequeue_task_fair(rq, p);
+}
+
+/*
+ * sched_yield() support is very simple via the rbtree: we just
+ * dequeue the task and move it after the next task, which
+ * causes tasks to roundrobin.
+ */
+static void
+yield_task_fair(struct rq *rq, struct task_struct *p, struct task_struct *p_to)
+{
+	struct rb_node *curr, *next, *first;
+	struct task_struct *p_next;
+	s64 yield_key;
+	u64 now;
+
+	/*
+	 * yield-to support: if we are on the same runqueue then
+	 * give half of our wait_runtime (if it's positive) to the other task:
+	 */
+	if (p_to && p->wait_runtime > 0) {
+		p_to->wait_runtime += p->wait_runtime >> 1;
+		p->wait_runtime >>= 1;
+	}
+	curr = &p->run_node;
+	first = first_fair(rq);
+	/*
+	 * Move this task to the second place in the tree:
+	 */
+	if (unlikely(curr != first)) {
+		next = first;
+	} else {
+		next = rb_next(curr);
+		/*
+		 * We were the last one already - nothing to do, return
+		 * and reschedule:
+		 */
+		if (unlikely(!next))
+			return;
+	}
+
+	p_next = rb_entry(next, struct task_struct, run_node);
+	/*
+	 * Minimally necessary key value to be the second in the tree:
+	 */
+	yield_key = p_next->fair_key + 1;
+
+	now = __rq_clock(rq);
+	dequeue_task_fair(rq, p, 0, now);
+	p->on_rq = 0;
+
+	/*
+	 * Only update the key if we need to move more backwards
+	 * than the minimally necessary position to be the second:
+	 */
+	if (p->fair_key < yield_key)
+		p->fair_key = yield_key;
+
+	__enqueue_task_fair(rq, p);
+	p->on_rq = 1;
+}
+
+/*
+ * Preempt the current task with a newly woken task if needed:
+ */
+static inline void
+__check_preempt_curr_fair(struct rq *rq, struct task_struct *p,
+			  struct task_struct *curr, unsigned long granularity)
+{
+	s64 __delta = curr->fair_key - p->fair_key;
+
+	/*
+	 * Take scheduling granularity into account - do not
+	 * preempt the current task unless the best task has
+	 * a larger than sched_granularity fairness advantage:
+	 */
+	if (__delta > niced_granularity(rq, curr, granularity))
+		resched_task(curr);
+}
+
+/*
+ * Preempt the current task with a newly woken task if needed:
+ */
+static void check_preempt_curr_fair(struct rq *rq, struct task_struct *p)
+{
+	struct task_struct *curr = rq->curr;
+
+	if ((curr == rq->idle) || rt_prio(p->prio)) {
+		resched_task(curr);
+	} else {
+		__check_preempt_curr_fair(rq, p, curr,
+					  sysctl_sched_granularity);
+	}
+}
+
+static struct task_struct * pick_next_task_fair(struct rq *rq, u64 now)
+{
+	struct task_struct *p = __pick_next_task_fair(rq);
+
+	/*
+	 * Any task has to be enqueued before it get to execute on
+	 * a CPU. So account for the time it spent waiting on the
+	 * runqueue. (note, here we rely on pick_next_task() having
+	 * done a put_prev_task_fair() shortly before this, which
+	 * updated rq->fair_clock - used by update_stats_wait_end())
+	 */
+	update_stats_wait_end(rq, p, now);
+	update_stats_curr_start(rq, p, now);
+
+	return p;
+}
+
+/*
+ * Account for a descheduled task:
+ */
+static void put_prev_task_fair(struct rq *rq, struct task_struct *prev, u64 now)
+{
+	if (prev == rq->idle)
+		return;
+
+	update_stats_curr_end(rq, prev, now);
+	/*
+	 * If the task is still waiting for the CPU (it just got
+	 * preempted), start the wait period:
+	 */
+	if (prev->on_rq)
+		update_stats_wait_start(rq, prev, now);
+}
+
+/**************************************************************/
+/* Fair scheduling class load-balancing methods:
+ */
+
+/*
+ * Load-balancing iterator. Note: while the runqueue stays locked
+ * during the whole iteration, the current task might be
+ * dequeued so the iterator has to be dequeue-safe. Here we
+ * achieve that by always pre-iterating before returning
+ * the current task:
+ */
+static struct task_struct * load_balance_start_fair(struct rq *rq)
+{
+	struct rb_node *first = first_fair(rq);
+	struct task_struct *p;
+
+	if (!first)
+		return NULL;
+
+	p = rb_entry(first, struct task_struct, run_node);
+
+	rq->rb_load_balance_curr = rb_next(first);
+
+	return p;
+}
+
+static struct task_struct * load_balance_next_fair(struct rq *rq)
+{
+	struct rb_node *curr = rq->rb_load_balance_curr;
+	struct task_struct *p;
+
+	if (!curr)
+		return NULL;
+
+	p = rb_entry(curr, struct task_struct, run_node);
+	rq->rb_load_balance_curr = rb_next(curr);
+
+	return p;
+}
+
+/*
+ * scheduler tick hitting a task of our scheduling class:
+ */
+static void task_tick_fair(struct rq *rq, struct task_struct *curr)
+{
+	struct task_struct *next;
+	u64 now = __rq_clock(rq);
+
+	/*
+	 * Dequeue and enqueue the task to update its
+	 * position within the tree:
+	 */
+	dequeue_task_fair(rq, curr, 0, now);
+	curr->on_rq = 0;
+	enqueue_task_fair(rq, curr, 0, now);
+	curr->on_rq = 1;
+
+	/*
+	 * Reschedule if another task tops the current one.
+	 */
+	next = __pick_next_task_fair(rq);
+	if (next == curr)
+		return;
+
+	if ((curr == rq->idle) || (rt_prio(next->prio) &&
+					(next->prio < curr->prio)))
+		resched_task(curr);
+	else
+		__check_preempt_curr_fair(rq, next, curr,
+					  sysctl_sched_granularity);
+}
+
+/*
+ * Share the fairness runtime between parent and child, thus the
+ * total amount of pressure for CPU stays equal - new tasks
+ * get a chance to run but frequent forkers are not allowed to
+ * monopolize the CPU. Note: the parent runqueue is locked,
+ * the child is not running yet.
+ */
+static void task_new_fair(struct rq *rq, struct task_struct *p)
+{
+	sched_info_queued(p);
+	update_stats_enqueue(rq, p, rq_clock(rq));
+	/*
+	 * Child runs first: we let it run before the parent
+	 * until it reschedules once. We set up the key so that
+	 * it will preempt the parent:
+	 */
+	p->fair_key = current->fair_key - niced_granularity(rq, rq->curr,
+						sysctl_sched_granularity) - 1;
+	__enqueue_task_fair(rq, p);
+	p->on_rq = 1;
+	inc_nr_running(p, rq);
+}
+
+/*
+ * All the scheduling class methods:
+ */
+struct sched_class fair_sched_class __read_mostly = {
+	.enqueue_task		= enqueue_task_fair,
+	.dequeue_task		= dequeue_task_fair,
+	.yield_task		= yield_task_fair,
+
+	.check_preempt_curr	= check_preempt_curr_fair,
+
+	.pick_next_task		= pick_next_task_fair,
+	.put_prev_task		= put_prev_task_fair,
+
+	.load_balance_start	= load_balance_start_fair,
+	.load_balance_next	= load_balance_next_fair,
+	.task_tick		= task_tick_fair,
+	.task_new		= task_new_fair,
+};
Index: linux-cfs-2.6.20.8.q/kernel/sched_rt.c
===================================================================
--- /dev/null
+++ linux-cfs-2.6.20.8.q/kernel/sched_rt.c
@@ -0,0 +1,184 @@
+/*
+ * Real-Time Scheduling Class (mapped to the SCHED_FIFO and SCHED_RR
+ * policies)
+ */
+
+static void
+enqueue_task_rt(struct rq *rq, struct task_struct *p, int wakeup, u64 now)
+{
+	struct prio_array *array = &rq->active;
+
+	list_add_tail(&p->run_list, array->queue + p->prio);
+	__set_bit(p->prio, array->bitmap);
+}
+
+/*
+ * Adding/removing a task to/from a priority array:
+ */
+static void
+dequeue_task_rt(struct rq *rq, struct task_struct *p, int sleep, u64 now)
+{
+	struct prio_array *array = &rq->active;
+
+	list_del(&p->run_list);
+	if (list_empty(array->queue + p->prio))
+		__clear_bit(p->prio, array->bitmap);
+}
+
+/*
+ * Put task to the end of the run list without the overhead of dequeue
+ * followed by enqueue.
+ */
+static void requeue_task_rt(struct rq *rq, struct task_struct *p)
+{
+	struct prio_array *array = &rq->active;
+
+	list_move_tail(&p->run_list, array->queue + p->prio);
+}
+
+static void
+yield_task_rt(struct rq *rq, struct task_struct *p, struct task_struct *p_to)
+{
+	requeue_task_rt(rq, p);
+}
+
+/*
+ * Preempt the current task with a newly woken task if needed:
+ */
+static void check_preempt_curr_rt(struct rq *rq, struct task_struct *p)
+{
+	if (p->prio < rq->curr->prio)
+		resched_task(rq->curr);
+}
+
+static struct task_struct * pick_next_task_rt(struct rq *rq, u64 now)
+{
+	struct prio_array *array = &rq->active;
+	struct list_head *queue;
+	int idx;
+
+	idx = sched_find_first_bit(array->bitmap);
+	if (idx >= MAX_RT_PRIO)
+		return NULL;
+
+	queue = array->queue + idx;
+	return list_entry(queue->next, struct task_struct, run_list);
+}
+
+/*
+ * No accounting done when RT tasks are descheduled:
+ */
+static void put_prev_task_rt(struct rq *rq, struct task_struct *p, u64 now)
+{
+}
+
+/*
+ * Load-balancing iterator. Note: while the runqueue stays locked
+ * during the whole iteration, the current task might be
+ * dequeued so the iterator has to be dequeue-safe. Here we
+ * achieve that by always pre-iterating before returning
+ * the current task:
+ */
+static struct task_struct * load_balance_start_rt(struct rq *rq)
+{
+	struct prio_array *array = &rq->active;
+	struct list_head *head, *curr;
+	struct task_struct *p;
+	int idx;
+
+	idx = sched_find_first_bit(array->bitmap);
+	if (idx >= MAX_RT_PRIO)
+		return NULL;
+
+	head = array->queue + idx;
+	curr = head->prev;
+
+	p = list_entry(curr, struct task_struct, run_list);
+
+	curr = curr->prev;
+
+	rq->rt_load_balance_idx = idx;
+	rq->rt_load_balance_head = head;
+	rq->rt_load_balance_curr = curr;
+
+	return p;
+}
+
+static struct task_struct * load_balance_next_rt(struct rq *rq)
+{
+	struct prio_array *array = &rq->active;
+	struct list_head *head, *curr;
+	struct task_struct *p;
+	int idx;
+
+	idx = rq->rt_load_balance_idx;
+	head = rq->rt_load_balance_head;
+	curr = rq->rt_load_balance_curr;
+
+	/*
+	 * If we arrived back to the head again then
+	 * iterate to the next queue (if any):
+	 */
+	if (unlikely(head == curr)) {
+		int next_idx = find_next_bit(array->bitmap, MAX_RT_PRIO, idx+1);
+
+		if (next_idx >= MAX_RT_PRIO)
+			return NULL;
+
+		idx = next_idx;
+		head = array->queue + idx;
+		curr = head->prev;
+
+		rq->rt_load_balance_idx = idx;
+		rq->rt_load_balance_head = head;
+	}
+
+	p = list_entry(curr, struct task_struct, run_list);
+
+	curr = curr->prev;
+
+	rq->rt_load_balance_curr = curr;
+
+	return p;
+}
+
+static void task_tick_rt(struct rq *rq, struct task_struct *p)
+{
+	/*
+	 * RR tasks need a special form of timeslice management.
+	 * FIFO tasks have no timeslices.
+	 */
+	if ((p->policy == SCHED_RR) && !--p->time_slice) {
+		p->time_slice = static_prio_timeslice(p->static_prio);
+		set_tsk_need_resched(p);
+
+		/* put it at the end of the queue: */
+		requeue_task_rt(rq, p);
+	}
+}
+
+/*
+ * No parent/child timeslice management necessary for RT tasks,
+ * just activate them:
+ */
+static void task_new_rt(struct rq *rq, struct task_struct *p)
+{
+	activate_task(rq, p, 1);
+}
+
+static struct sched_class rt_sched_class __read_mostly = {
+	.enqueue_task		= enqueue_task_rt,
+	.dequeue_task		= dequeue_task_rt,
+	.yield_task		= yield_task_rt,
+
+	.check_preempt_curr	= check_preempt_curr_rt,
+
+	.pick_next_task		= pick_next_task_rt,
+	.put_prev_task		= put_prev_task_rt,
+
+	.load_balance_start	= load_balance_start_rt,
+	.load_balance_next	= load_balance_next_rt,
+
+	.task_tick		= task_tick_rt,
+	.task_new		= task_new_rt,
+};
Index: linux-cfs-2.6.20.8.q/kernel/sched_stats.h
===================================================================
--- /dev/null
+++ linux-cfs-2.6.20.8.q/kernel/sched_stats.h
@@ -0,0 +1,235 @@
+
+#ifdef CONFIG_SCHEDSTATS
+/*
+ * bump this up when changing the output format or the meaning of an existing
+ * format, so that tools can adapt (or abort)
+ */
+#define SCHEDSTAT_VERSION 14
+
+static int show_schedstat(struct seq_file *seq, void *v)
+{
+	int cpu;
+
+	seq_printf(seq, "version %d\n", SCHEDSTAT_VERSION);
+	seq_printf(seq, "timestamp %lu\n", jiffies);
+	for_each_online_cpu(cpu) {
+		struct rq *rq = cpu_rq(cpu);
+#ifdef CONFIG_SMP
+		struct sched_domain *sd;
+		int dcnt = 0;
+#endif
+
+		/* runqueue-specific stats */
+		seq_printf(seq,
+		    "cpu%d %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu",
+		    cpu, rq->yld_both_empty,
+		    rq->yld_act_empty, rq->yld_exp_empty, rq->yld_cnt,
+		    rq->sched_switch, rq->sched_cnt, rq->sched_goidle,
+		    rq->ttwu_cnt, rq->ttwu_local,
+		    rq->rq_sched_info.cpu_time,
+		    rq->rq_sched_info.run_delay, rq->rq_sched_info.pcnt);
+
+		seq_printf(seq, "\n");
+
+#ifdef CONFIG_SMP
+		/* domain-specific stats */
+		preempt_disable();
+		for_each_domain(cpu, sd) {
+			enum idle_type itype;
+			char mask_str[NR_CPUS];
+
+			cpumask_scnprintf(mask_str, NR_CPUS, sd->span);
+			seq_printf(seq, "domain%d %s", dcnt++, mask_str);
+			for (itype = SCHED_IDLE; itype < MAX_IDLE_TYPES;
+					itype++) {
+				seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu "
+						"%lu",
+				    sd->lb_cnt[itype],
+				    sd->lb_balanced[itype],
+				    sd->lb_failed[itype],
+				    sd->lb_imbalance[itype],
+				    sd->lb_gained[itype],
+				    sd->lb_hot_gained[itype],
+				    sd->lb_nobusyq[itype],
+				    sd->lb_nobusyg[itype]);
+			}
+			seq_printf(seq, " %lu %lu %lu %lu %lu %lu %lu %lu %lu"
+			    " %lu %lu %lu\n",
+			    sd->alb_cnt, sd->alb_failed, sd->alb_pushed,
+			    sd->sbe_cnt, sd->sbe_balanced, sd->sbe_pushed,
+			    sd->sbf_cnt, sd->sbf_balanced, sd->sbf_pushed,
+			    sd->ttwu_wake_remote, sd->ttwu_move_affine,
+			    sd->ttwu_move_balance);
+		}
+		preempt_enable();
+#endif
+	}
+	return 0;
+}
+
+static int schedstat_open(struct inode *inode, struct file *file)
+{
+	unsigned int size = PAGE_SIZE * (1 + num_online_cpus() / 32);
+	char *buf = kmalloc(size, GFP_KERNEL);
+	struct seq_file *m;
+	int res;
+
+	if (!buf)
+		return -ENOMEM;
+	res = single_open(file, show_schedstat, NULL);
+	if (!res) {
+		m = file->private_data;
+		m->buf = buf;
+		m->size = size;
+	} else
+		kfree(buf);
+	return res;
+}
+
+const struct file_operations proc_schedstat_operations = {
+	.open    = schedstat_open,
+	.read    = seq_read,
+	.llseek  = seq_lseek,
+	.release = single_release,
+};
+
+/*
+ * Expects runqueue lock to be held for atomicity of update
+ */
+static inline void
+rq_sched_info_arrive(struct rq *rq, unsigned long delta_jiffies)
+{
+	if (rq) {
+		rq->rq_sched_info.run_delay += delta_jiffies;
+		rq->rq_sched_info.pcnt++;
+	}
+}
+
+/*
+ * Expects runqueue lock to be held for atomicity of update
+ */
+static inline void
+rq_sched_info_depart(struct rq *rq, unsigned long delta_jiffies)
+{
+	if (rq)
+		rq->rq_sched_info.cpu_time += delta_jiffies;
+}
+# define schedstat_inc(rq, field)	do { (rq)->field++; } while (0)
+# define schedstat_add(rq, field, amt)	do { (rq)->field += (amt); } while (0)
+#else /* !CONFIG_SCHEDSTATS */
+static inline void
+rq_sched_info_arrive(struct rq *rq, unsigned long delta_jiffies)
+{}
+static inline void
+rq_sched_info_depart(struct rq *rq, unsigned long delta_jiffies)
+{}
+# define schedstat_inc(rq, field)	do { } while (0)
+# define schedstat_add(rq, field, amt)	do { } while (0)
+#endif
+
+#if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT)
+/*
+ * Called when a process is dequeued from the active array and given
+ * the cpu.  We should note that with the exception of interactive
+ * tasks, the expired queue will become the active queue after the active
+ * queue is empty, without explicitly dequeuing and requeuing tasks in the
+ * expired queue.  (Interactive tasks may be requeued directly to the
+ * active queue, thus delaying tasks in the expired queue from running;
+ * see scheduler_tick()).
+ *
+ * This function is only called from sched_info_arrive(), rather than
+ * dequeue_task(). Even though a task may be queued and dequeued multiple
+ * times as it is shuffled about, we're really interested in knowing how
+ * long it was from the *first* time it was queued to the time that it
+ * finally hit a cpu.
+ */
+static inline void sched_info_dequeued(struct task_struct *t)
+{
+	t->sched_info.last_queued = 0;
+}
+
+/*
+ * Called when a task finally hits the cpu.  We can now calculate how
+ * long it was waiting to run.  We also note when it began so that we
+ * can keep stats on how long its timeslice is.
+ */
+static void sched_info_arrive(struct task_struct *t)
+{
+	unsigned long now = jiffies, delta_jiffies = 0;
+
+	if (t->sched_info.last_queued)
+		delta_jiffies = now - t->sched_info.last_queued;
+	sched_info_dequeued(t);
+	t->sched_info.run_delay += delta_jiffies;
+	t->sched_info.last_arrival = now;
+	t->sched_info.pcnt++;
+
+	rq_sched_info_arrive(task_rq(t), delta_jiffies);
+}
+
+/*
+ * Called when a process is queued into either the active or expired
+ * array.  The time is noted and later used to determine how long we
+ * had to wait for us to reach the cpu.  Since the expired queue will
+ * become the active queue after active queue is empty, without dequeuing
+ * and requeuing any tasks, we are interested in queuing to either. It
+ * is unusual but not impossible for tasks to be dequeued and immediately
+ * requeued in the same or another array: this can happen in sched_yield(),
+ * set_user_nice(), and even load_balance() as it moves tasks from runqueue
+ * to runqueue.
+ *
+ * This function is only called from enqueue_task(), but also only updates
+ * the timestamp if it is already not set.  It's assumed that
+ * sched_info_dequeued() will clear that stamp when appropriate.
+ */
+static inline void sched_info_queued(struct task_struct *t)
+{
+	if (unlikely(sched_info_on()))
+		if (!t->sched_info.last_queued)
+			t->sched_info.last_queued = jiffies;
+}
+
+/*
+ * Called when a process ceases being the active-running process, either
+ * voluntarily or involuntarily.  Now we can calculate how long we ran.
+ */
+static inline void sched_info_depart(struct task_struct *t)
+{
+	unsigned long delta_jiffies = jiffies - t->sched_info.last_arrival;
+
+	t->sched_info.cpu_time += delta_jiffies;
+	rq_sched_info_depart(task_rq(t), delta_jiffies);
+}
+
+/*
+ * Called when tasks are switched involuntarily due, typically, to expiring
+ * their time slice.  (This may also be called when switching to or from
+ * the idle task.)  We are only called when prev != next.
+ */
+static inline void
+__sched_info_switch(struct task_struct *prev, struct task_struct *next)
+{
+	struct rq *rq = task_rq(prev);
+
+	/*
+	 * prev now departs the cpu.  It's not interesting to record
+	 * stats about how efficient we were at scheduling the idle
+	 * process, however.
+	 */
+	if (prev != rq->idle)
+		sched_info_depart(prev);
+
+	if (next != rq->idle)
+		sched_info_arrive(next);
+}
+static inline void
+sched_info_switch(struct task_struct *prev, struct task_struct *next)
+{
+	if (unlikely(sched_info_on()))
+		__sched_info_switch(prev, next);
+}
+#else
+#define sched_info_queued(t)		do { } while (0)
+#define sched_info_switch(t, next)	do { } while (0)
+#endif /* CONFIG_SCHEDSTATS || CONFIG_TASK_DELAY_ACCT */
+
Index: linux-cfs-2.6.20.8.q/kernel/sysctl.c
===================================================================
--- linux-cfs-2.6.20.8.q.orig/kernel/sysctl.c
+++ linux-cfs-2.6.20.8.q/kernel/sysctl.c
@@ -320,6 +320,46 @@ static ctl_table kern_table[] = {
 		.strategy	= &sysctl_uts_string,
 	},
 	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "sched_granularity_ns",
+		.data		= &sysctl_sched_granularity,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "sched_wakeup_granularity_ns",
+		.data		= &sysctl_sched_wakeup_granularity,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "sched_sleep_history_max_ns",
+		.data		= &sysctl_sched_sleep_history_max,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "sched_child_runs_first",
+		.data		= &sysctl_sched_child_runs_first,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
+		.ctl_name	= CTL_UNNUMBERED,
+		.procname	= "sched_load_smoothing",
+		.data		= &sysctl_sched_load_smoothing,
+		.maxlen		= sizeof(unsigned int),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec,
+	},
+	{
 		.ctl_name	= KERN_PANIC,
 		.procname	= "panic",
 		.data		= &panic_timeout,