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locking/mutexes: Add extra reschedule point
author
Peter Zijlstra
<peterz@infradead.org>
Mon, 3 Feb 2014 15:21:09 +0000
(16:21 +0100)
committer
Ingo Molnar
<mingo@kernel.org>
Tue, 11 Mar 2014 11:14:59 +0000
(12:14 +0100)
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>
kernel/locking/mutex.c
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diff --git
a/kernel/locking/mutex.c
b/kernel/locking/mutex.c
index
2670b84
..
02c61a9
100644
(file)
--- 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);