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[PATCH] sched: avoid taking 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>
Cc: Peter Williams <pwil3058@bigpond.net.au>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Lameter 2006-12-10 02:20:13 -08:00 committed by Linus Torvalds
parent ac7d550499
commit 571f6d2fb0
1 changed files with 3 additions and 0 deletions
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kernel/sched.c
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@ -2915,6 +2915,9 @@ static inline int wake_priority_sleeper(struct rq *rq)
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