linux-kernel - [tip:sched/core] sched: Use rq->clock_task instead of rq->clock for correctly maintaining load averages

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Message-ID: <tip-05ca62c6ca17f39b88fa956d5ebc1fa6e93ad5e3@git.kernel.org>
Date:	Wed, 26 Jan 2011 12:10:40 GMT
From:	tip-bot for Paul Turner <pjt@...gle.com>
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: Use rq->clock_task instead of rq->clock for correctly maintaining load averages

Commit-ID:  05ca62c6ca17f39b88fa956d5ebc1fa6e93ad5e3
Gitweb:     http://git.kernel.org/tip/05ca62c6ca17f39b88fa956d5ebc1fa6e93ad5e3
Author:     Paul Turner <pjt@...gle.com>
AuthorDate: Fri, 21 Jan 2011 20:45:02 -0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 26 Jan 2011 12:31:03 +0100

sched: Use rq->clock_task instead of rq->clock for correctly maintaining load averages

The delta in clock_task is a more fair attribution of how much time a tg has
been contributing load to the current cpu.

While not really important it also means we're more in sync (by magnitude)
with respect to periodic updates (since __update_curr deltas are clock_task
based).

Signed-off-by: Paul Turner <pjt@...gle.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <20110122044852.007092349@...gle.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_fair.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 1997383..0c26e2d 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -725,7 +725,7 @@ static void update_cfs_load(struct cfs_rq *cfs_rq, int global_update)
 	if (cfs_rq->tg == &root_task_group)
 		return;
 
-	now = rq_of(cfs_rq)->clock;
+	now = rq_of(cfs_rq)->clock_task;
 	delta = now - cfs_rq->load_stamp;
 
 	/* truncate load history at 4 idle periods */
--
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