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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-03-13 12:21:26 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-20 20:49:53 +0200 |
| commit | ff743345bf7685a207868048a70e23164c4785e5 (patch) | |
| tree | 7cdb917ad5ac3aa7798b0358a246ddc46a363cdc /kernel | |
| parent | 13318a7186d8e0ae08c996ea4111a945e7789772 (diff) | |
| download | linux-ff743345bf7685a207868048a70e23164c4785e5.tar.gz linux-ff743345bf7685a207868048a70e23164c4785e5.tar.bz2 linux-ff743345bf7685a207868048a70e23164c4785e5.zip | |
sched: remove extra call overhead for schedule()
Lai Jiangshan's patch reminded me that I promised Nick to remove
that extra call overhead in schedule().
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090313112300.927414207@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/mutex.c | 4 | ||||
| -rw-r--r-- | kernel/sched.c | 12 |
2 files changed, 7 insertions, 9 deletions
diff --git a/kernel/mutex.c b/kernel/mutex.c index 5d79781394a3..e1fb73510409 100644 --- a/kernel/mutex.c +++ b/kernel/mutex.c @@ -248,7 +248,9 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass, /* didnt get the lock, go to sleep: */ spin_unlock_mutex(&lock->wait_lock, flags); - __schedule(); + preempt_enable_no_resched(); + schedule(); + preempt_disable(); spin_lock_mutex(&lock->wait_lock, flags); } diff --git a/kernel/sched.c b/kernel/sched.c index 7601ceebf7ce..797f6fdabadf 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -5131,13 +5131,15 @@ pick_next_task(struct rq *rq) /* * schedule() is the main scheduler function. */ -asmlinkage void __sched __schedule(void) +asmlinkage void __sched schedule(void) { struct task_struct *prev, *next; unsigned long *switch_count; struct rq *rq; int cpu; +need_resched: + preempt_disable(); cpu = smp_processor_id(); rq = cpu_rq(cpu); rcu_qsctr_inc(cpu); @@ -5194,15 +5196,9 @@ need_resched_nonpreemptible: if (unlikely(reacquire_kernel_lock(current) < 0)) goto need_resched_nonpreemptible; -} -asmlinkage void __sched schedule(void) -{ -need_resched: - preempt_disable(); - __schedule(); preempt_enable_no_resched(); - if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) + if (need_resched()) goto need_resched; } EXPORT_SYMBOL(schedule); |