From: Andi Kleen <a...@linux.intel.com>
_cond_resched does at least two explicit calls just to decide to do
nothing: _cond_resched and should_resched(). Inline a need_resched()
into the caller to avoid these calls in the common case of no reschedule
being needed.
Signed-off-by: Andi Kleen <a...@linux.intel.com>
---
include/linux/sched.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 97f4b78..dd3fafc 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2435,7 +2435,7 @@ extern int __cond_resched_softirq(void);
#ifdef CONFIG_PREEMPT_VOLUNTARY
extern int _cond_resched(void);
-# define might_resched() _cond_resched()
+# define might_resched() (need_resched() ? _cond_resched() : 0)
#else
# define might_resched() do { } while (0)
#endif
--
1.8.3.1
--
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