diff options
Diffstat (limited to 'recipes/linux/linux-omap-pm-2.6.29/omap3-touchbook/boot-trace-for-optimization.patch')
| -rw-r--r-- | recipes/linux/linux-omap-pm-2.6.29/omap3-touchbook/boot-trace-for-optimization.patch | 251 |
1 files changed, 251 insertions, 0 deletions
diff --git a/recipes/linux/linux-omap-pm-2.6.29/omap3-touchbook/boot-trace-for-optimization.patch b/recipes/linux/linux-omap-pm-2.6.29/omap3-touchbook/boot-trace-for-optimization.patch new file mode 100644 index 0000000000..fcb7ae480e --- /dev/null +++ b/recipes/linux/linux-omap-pm-2.6.29/omap3-touchbook/boot-trace-for-optimization.patch @@ -0,0 +1,251 @@ +commit e9c4f51ad2b76ddbf90863c44085574197247ba3 +Author: Auke Kok <auke-jan.h.kok@intel.com> +Date: Tue Jan 27 11:26:00 2009 -0800 + + trace: tracer for sys_open() - sreadahead + + This tracer monitors regular file open() syscalls. This is a fast + and low-overhead alternative to strace, and does not allow or + require to be attached to every process. + + Signed-off-by: Auke Kok <auke-jan.h.kok@intel.com> + +diff --git a/fs/open.c b/fs/open.c +index a3a78ce..bd9eb9d 100644 +--- a/fs/open.c ++++ b/fs/open.c +@@ -30,6 +30,10 @@ + #include <linux/audit.h> + #include <linux/falloc.h> + ++#include <trace/fs.h> ++ ++DEFINE_TRACE(do_sys_open); ++ + int vfs_statfs(struct dentry *dentry, struct kstatfs *buf) + { + int retval = -ENODEV; +@@ -1039,6 +1043,7 @@ long do_sys_open(int dfd, const char __user *filename, int flags, int mode) + } else { + fsnotify_open(f->f_path.dentry); + fd_install(fd, f); ++ trace_do_sys_open(f, flags, mode, fd); + } + } + putname(tmp); +diff --git a/include/trace/fs.h b/include/trace/fs.h +new file mode 100644 +index 0000000..870eec2 +--- /dev/null ++++ b/include/trace/fs.h +@@ -0,0 +1,11 @@ ++#ifndef _TRACE_FS_H ++#define _TRACE_FS_H ++ ++#include <linux/fs.h> ++#include <linux/tracepoint.h> ++ ++DECLARE_TRACE(do_sys_open, ++ TPPROTO(struct file *filp, int flags, int mode, long fd), ++ TPARGS(filp, flags, mode, fd)); ++ ++#endif +diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig +index e2a4ff6..d2a1ec1 100644 +--- a/kernel/trace/Kconfig ++++ b/kernel/trace/Kconfig +@@ -149,6 +149,15 @@ config CONTEXT_SWITCH_TRACER + This tracer gets called from the context switch and records + all switching of tasks. + ++config OPEN_TRACER ++ bool "Trace open() calls" ++ depends on DEBUG_KERNEL ++ select TRACING ++ select MARKERS ++ help ++ This tracer records open() syscalls. These calls are made when ++ files are accessed on disk. ++ + config BOOT_TRACER + bool "Trace boot initcalls" + depends on DEBUG_KERNEL +diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile +index 349d5a9..7f2a366 100644 +--- a/kernel/trace/Makefile ++++ b/kernel/trace/Makefile +@@ -20,6 +20,7 @@ obj-$(CONFIG_RING_BUFFER) += ring_buffer.o + + obj-$(CONFIG_TRACING) += trace.o + obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o ++obj-$(CONFIG_OPEN_TRACER) += trace_open.o + obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o + obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o + obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o +diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h +index 4d3d381..24c17d2 100644 +--- a/kernel/trace/trace.h ++++ b/kernel/trace/trace.h +@@ -30,6 +30,7 @@ enum trace_type { + TRACE_USER_STACK, + TRACE_HW_BRANCHES, + TRACE_POWER, ++ TRACE_OPEN, + + __TRACE_LAST_TYPE + }; +diff --git a/kernel/trace/trace_open.c b/kernel/trace/trace_open.c +new file mode 100644 +index 0000000..7153dfc +--- /dev/null ++++ b/kernel/trace/trace_open.c +@@ -0,0 +1,149 @@ ++/* ++ * trace open calls ++ * Copyright (C) 2009 Intel Corporation ++ * ++ * Based extensively on trace_sched_switch.c ++ * Copyright (C) 2007 Steven Rostedt <srostedt@redhat.com> ++ * ++ */ ++ ++#include <linux/module.h> ++#include <linux/fs.h> ++#include <linux/debugfs.h> ++#include <linux/kallsyms.h> ++#include <linux/uaccess.h> ++#include <linux/ftrace.h> ++#include <trace/fs.h> ++ ++#include "trace.h" ++ ++ ++static struct trace_array *ctx_trace; ++static int __read_mostly open_trace_enabled; ++static atomic_t open_ref; ++ ++static void probe_do_sys_open(struct file *filp, int flags, int mode, long fd) ++{ ++ char *buf; ++ char *fname; ++ ++ if (!atomic_read(&open_ref)) ++ return; ++ ++ if (!open_trace_enabled) ++ return; ++ ++ buf = kzalloc(PAGE_SIZE, GFP_KERNEL); ++ if (!buf) ++ return; ++ ++ fname = d_path(&filp->f_path, buf, PAGE_SIZE); ++ if (IS_ERR(fname)) ++ goto out; ++ ++ ftrace_printk("%s: open(\"%s\", %d, %d) = %ld\n", ++ current->comm, fname, flags, mode, fd); ++ ++out: ++ kfree(buf); ++} ++ ++static void open_trace_reset(struct trace_array *tr) ++{ ++ tr->time_start = ftrace_now(tr->cpu); ++ tracing_reset_online_cpus(tr); ++} ++ ++static int open_trace_register(void) ++{ ++ int ret; ++ ++ ret = register_trace_do_sys_open(probe_do_sys_open); ++ if (ret) { ++ pr_info("open trace: Could not activate tracepoint" ++ " probe to do_open\n"); ++ } ++ ++ return ret; ++} ++ ++static void open_trace_unregister(void) ++{ ++ unregister_trace_do_sys_open(probe_do_sys_open); ++} ++ ++static void open_trace_start(void) ++{ ++ long ref; ++ ++ ref = atomic_inc_return(&open_ref); ++ if (ref == 1) ++ open_trace_register(); ++} ++ ++static void open_trace_stop(void) ++{ ++ long ref; ++ ++ ref = atomic_dec_and_test(&open_ref); ++ if (ref) ++ open_trace_unregister(); ++} ++ ++void open_trace_start_cmdline_record(void) ++{ ++ open_trace_start(); ++} ++ ++void open_trace_stop_cmdline_record(void) ++{ ++ open_trace_stop(); ++} ++ ++static void open_start_trace(struct trace_array *tr) ++{ ++ open_trace_reset(tr); ++ open_trace_start_cmdline_record(); ++ open_trace_enabled = 1; ++} ++ ++static void open_stop_trace(struct trace_array *tr) ++{ ++ open_trace_enabled = 0; ++ open_trace_stop_cmdline_record(); ++} ++ ++static int open_trace_init(struct trace_array *tr) ++{ ++ ctx_trace = tr; ++ ++ open_start_trace(tr); ++ return 0; ++} ++ ++static void reset_open_trace(struct trace_array *tr) ++{ ++ open_stop_trace(tr); ++} ++ ++static struct tracer open_trace __read_mostly = ++{ ++ .name = "open", ++ .init = open_trace_init, ++ .reset = reset_open_trace, ++}; ++ ++__init static int init_open_trace(void) ++{ ++ int ret = 0; ++ ++ if (atomic_read(&open_ref)) ++ ret = open_trace_register(); ++ if (ret) { ++ pr_info("error registering open trace\n"); ++ return ret; ++ } ++ return register_tracer(&open_trace); ++} ++device_initcall(init_open_trace); ++ |