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Date: Tue, 11 Mar 2014 05:41:51 -0700 From: tip-bot for Peter Zijlstra <tipbot@...or.com> To: linux-tip-commits@...r.kernel.org Cc: linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org, peterz@...radead.org, tglx@...utronix.de Subject: [tip:core/locking] locking/mutexes: Add extra reschedule point Commit-ID: 34c6bc2c919a55e5ad4e698510a2f35ee13ab900 Gitweb: http://git.kernel.org/tip/34c6bc2c919a55e5ad4e698510a2f35ee13ab900 Author: Peter Zijlstra <peterz@...radead.org> AuthorDate: Mon, 3 Feb 2014 16:21:09 +0100 Committer: Ingo Molnar <mingo@...nel.org> CommitDate: Tue, 11 Mar 2014 12:14:59 +0100 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@...radead.org> Link: http://lkml.kernel.org/n/tip-zah5eyn9gu7qlgwh9r6n2anc@git.kernel.org Signed-off-by: Ingo Molnar <mingo@...nel.org> --- kernel/locking/mutex.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 2670b84..02c61a9 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -468,6 +468,13 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass, } osq_unlock(&lock->osq); 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 spin_lock_mutex(&lock->wait_lock, flags); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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