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Commit 34c6bc2c authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

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: default avatarPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-zah5eyn9gu7qlgwh9r6n2anc@git.kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent fb0527bd

kernel/locking/mutex.c

+7 −0
Original line number Original line Diff line number Diff line
@@ -468,6 +468,13 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass, 
	}

	}

	osq_unlock(&lock->osq);

	osq_unlock(&lock->osq);

slowpath:

slowpath:

	/*

	 * If we fell out of the spin path because of need_resched(),

	 * reschedule now, before we try-lock the mutex. This avoids getting

	 * scheduled out right after we obtained the mutex.

	 */

	if (need_resched())

		schedule_preempt_disabled();

#endif

#endif

	spin_lock_mutex(&lock->wait_lock, flags);

	spin_lock_mutex(&lock->wait_lock, flags);