Commit 368a5fa1 authored Jun 23, 2006 by Hua Zhong Committed by Linus Torvalds Jun 23, 2006

[PATCH] remove unlikely() in might_sleep_if()



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>

parent 0216bfcf

include/linux/kernel.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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); \