AcoSail/kernel_optimize_test
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[PATCH] remove unlikely() in might_sleep_if()

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The likely() profiling tools show that __alloc_page() causes a lot of misses:

!       132    119193 __alloc_pages():mm/page_alloc.c@937

Because most __alloc_page() calls are not atomic.

Signed-off-by: Hua Zhong <hzhong@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hua Zhong 2006-06-23 02:05:42 -07:00 committed by Linus Torvalds
parent 0216bfcffe
commit 368a5fa1f2
1 changed files with 1 additions and 1 deletions
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include/linux/kernel.h
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@ -78,7 +78,7 @@ extern int cond_resched(void);
# define might_sleep() do { might_resched(); } while (0)
#endif
#define might_sleep_if(cond) do { if (unlikely(cond)) might_sleep(); } while (0)
#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)
#define abs(x) ({ \
int __x = (x); \