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Message-Id: <1390936396-3962-2-git-send-email-jason.low2@hp.com> Date: Tue, 28 Jan 2014 11:13:12 -0800 From: Jason Low <jason.low2@...com> To: mingo@...hat.com, peterz@...radead.org, paulmck@...ux.vnet.ibm.com, Waiman.Long@...com, torvalds@...ux-foundation.org, tglx@...utronix.de, jason.low2@...com Cc: linux-kernel@...r.kernel.org, riel@...hat.com, akpm@...ux-foundation.org, davidlohr@...com, hpa@...or.com, andi@...stfloor.org, aswin@...com, scott.norton@...com, chegu_vinod@...com Subject: [PATCH v2 1/5] mutex: In mutex_can_spin_on_owner(), return false if task need_resched() 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@...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 -- 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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