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authorPeter Zijlstra <peterz@infradead.org>2014-02-03 16:21:09 +0100
committerIngo Molnar <mingo@kernel.org>2014-03-11 12:14:59 +0100
commit34c6bc2c919a55e5ad4e698510a2f35ee13ab900 (patch)
tree5ad85f7c86b6e42987d974f73e1b45aed05550a3 /kernel/locking
parentfb0527bd5ea99bfeb2dd91e3c1433ecf745d6b99 (diff)
downloadlinux-34c6bc2c919a55e5ad4e698510a2f35ee13ab900.tar.bz2
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>
Diffstat (limited to 'kernel/locking')
-rw-r--r--kernel/locking/mutex.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index 2670b84067d6..02c61a9c8906 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);