Messages in this thread Patch in this message | | | From | Jason Low <> | Subject | [PATCH v2 1/5] mutex: In mutex_can_spin_on_owner(), return false if task need_resched() | Date | Tue, 28 Jan 2014 11:13:12 -0800 |
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The mutex_can_spin_on_owner() function should also return false if the task needs to be rescheduled to avoid entering the MCS queue when it needs to reschedule.
Signed-off-by: Jason Low <jason.low2@hp.com> --- kernel/locking/mutex.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c index 4dd6e4c..85c6be1 100644 --- a/kernel/locking/mutex.c +++ b/kernel/locking/mutex.c @@ -212,6 +212,9 @@ static inline int mutex_can_spin_on_owner(struct mutex *lock) struct task_struct *owner; int retval = 1; + if (need_resched()) + return 0; + rcu_read_lock(); owner = ACCESS_ONCE(lock->owner); if (owner) -- 1.7.1
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