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From d656a447893dccc310c975a239f482278550c3e0 Mon Sep 17 00:00:00 2001
From: Jan Stancek <jstancek@redhat.com>
Date: Tue, 21 May 2019 10:10:44 +0200
Subject: [PATCH] overcommit_memory: update for "mm: fix false-positive
OVERCOMMIT_GUESS failures"
commit 8c7829b04c52 ("mm: fix false-positive OVERCOMMIT_GUESS failures")
changes logic of __vm_enough_memory(), simplifying it to:
When in GUESS mode, catch wild allocations by comparing their request
size to total amount of ram and swap in the system.
Testcase currently allocates mem_total + swap_total, which doesn't trigger
new condition. Make it more extreme, but assuming free_total / 2 will PASS,
and 2*sum_total will FAIL.
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
Upstream-Status: Backport [https://github.com/linux-test-project/ltp/commit/d656a447893dccc310c975a239f482278550c3e0]
Signed-off-by: He Zhe <zhe.he@windriver.com>
---
testcases/kernel/mem/tunable/overcommit_memory.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/testcases/kernel/mem/tunable/overcommit_memory.c b/testcases/kernel/mem/tunable/overcommit_memory.c
index 555298f..345764d 100644
--- a/testcases/kernel/mem/tunable/overcommit_memory.c
+++ b/testcases/kernel/mem/tunable/overcommit_memory.c
@@ -36,11 +36,10 @@
*
* The program is designed to test the two tunables:
*
- * When overcommit_memory = 0, allocatable memory can't overextends
- * the amount of free memory. I choose the three cases:
+ * When overcommit_memory = 0, allocatable memory can't overextend
+ * the amount of total memory:
* a. less than free_total: free_total / 2, alloc should pass.
- * b. greater than free_total: free_total * 2, alloc should fail.
- * c. equal to sum_total: sum_tatal, alloc should fail
+ * b. greater than sum_total: sum_total * 2, alloc should fail.
*
* When overcommit_memory = 1, it can alloc enough much memory, I
* choose the three cases:
@@ -164,9 +163,7 @@ static void overcommit_memory_test(void)
update_mem();
alloc_and_check(free_total / 2, EXPECT_PASS);
- update_mem();
- alloc_and_check(free_total * 2, EXPECT_FAIL);
- alloc_and_check(sum_total, EXPECT_FAIL);
+ alloc_and_check(sum_total * 2, EXPECT_FAIL);
/* start to test overcommit_memory=1 */
set_sys_tune("overcommit_memory", 1, 1);
--
2.7.4
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