linux-kernel - [tip:sched/core] sched: Avoid expensive initial update_cfs

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Message-ID: <tip-2d65333ab09b9a11722d822231c85b9f251cfe9d@git.kernel.org>
Date:	Wed, 26 Jan 2011 12:45:44 GMT
From:	tip-bot for Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, pjt@...gle.com, tglx@...utronix.de,
	mingo@...e.hu
Subject: [tip:sched/core] sched: Avoid expensive initial update_cfs_load(), on UP too

Commit-ID:  2d65333ab09b9a11722d822231c85b9f251cfe9d
Gitweb:     http://git.kernel.org/tip/2d65333ab09b9a11722d822231c85b9f251cfe9d
Author:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
AuthorDate: Wed, 26 Jan 2011 13:36:03 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 26 Jan 2011 13:43:55 +0100

sched: Avoid expensive initial update_cfs_load(), on UP too

Fix the build on UP.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Paul Turner <pjt@...gle.com>
LKML-Reference: <20110122044852.102126037@...gle.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 3fc5749..1f6ca89 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7931,8 +7931,10 @@ static void init_cfs_rq(struct cfs_rq *cfs_rq, struct rq *rq)
 #ifdef CONFIG_FAIR_GROUP_SCHED
 	cfs_rq->rq = rq;
 	/* allow initial update_cfs_load() to truncate */
+#ifdef CONFIG_SMP
 	cfs_rq->load_stamp = 1;
 #endif
+#endif
 	cfs_rq->min_vruntime = (u64)(-(1LL << 20));
 }
 
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