Messages in this thread Patch in this message | | | Date | Fri, 3 Nov 2006 12:46:41 -0800 (PST) | From | Christoph Lameter <> | Subject | [PATCH 1/7] Avoid taking rq lock in wake_priority_sleeper |
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Avoid taking the rq lock in wake_priority sleeper
Avoid taking the request queue lock in wake_priority_sleeper if there are no running processes.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Index: linux-2.6.19-rc4-mm2/kernel/sched.c =================================================================== --- linux-2.6.19-rc4-mm2.orig/kernel/sched.c 2006-11-02 17:31:05.964060772 -0600 +++ linux-2.6.19-rc4-mm2/kernel/sched.c 2006-11-03 12:51:15.281805162 -0600 @@ -2899,6 +2899,9 @@ static inline int wake_priority_sleeper( int ret = 0; #ifdef CONFIG_SCHED_SMT + if (!rq->nr_running) + return 0; + spin_lock(&rq->lock); /* * If an SMT sibling task has been put to sleep for priority - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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