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sched: do not do cond_resched() when CONFIG_PREEMPT

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Why do we even have cond_resched when real preemption
is on? It seems to be a waste of space and time.

remove cond_resched with CONFIG_PREEMPT on.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Herbert Xu
2008-01-25 21:08:28 +01:00
committed by Ingo Molnar
parent 03319ec8b0
commit 02b67cc3ba
3 changed files with 18 additions and 5 deletions
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13
include/linux/sched.h
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@@ -1885,7 +1885,18 @@ static inline int need_resched(void)
* cond_resched_lock() will drop the spinlock before scheduling,
* cond_resched_softirq() will enable bhs before scheduling.
*/
extern int cond_resched(void);
#ifdef CONFIG_PREEMPT
static inline int cond_resched(void)
{
return 0;
}
#else
extern int _cond_resched(void);
static inline int cond_resched(void)
{
return _cond_resched();
}
#endif
extern int cond_resched_lock(spinlock_t * lock);
extern int cond_resched_softirq(void);