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Commit 571f6d2f authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

[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: default avatarChristoph 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: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ac7d5504

kernel/sched.c

+3 −0
Original line number Diff line number Diff line
@@ -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