locking/mutexes: Add extra reschedule point
Add in an extra reschedule in an attempt to avoid getting reschedule the moment we've acquired the lock. Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/n/tip-zah5eyn9gu7qlgwh9r6n2anc@git.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -468,6 +468,13 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
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}
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osq_unlock(&lock->osq);
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slowpath:
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/*
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* If we fell out of the spin path because of need_resched(),
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* reschedule now, before we try-lock the mutex. This avoids getting
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* scheduled out right after we obtained the mutex.
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*/
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if (need_resched())
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schedule_preempt_disabled();
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#endif
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spin_lock_mutex(&lock->wait_lock, flags);
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