linux-kernel - [tip:sched/core] sched: Fix the place where group powers are updated

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Message-ID: <tip-871e35bc9733f273eaf5ceb69bbd0423b58e5285@git.kernel.org>
Date:	Thu, 21 Jan 2010 13:54:27 GMT
From:	tip-bot for Gautham R Shenoy <ego@...ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, jschopp@...tin.ibm.com,
	ego@...ibm.com, hpa@...or.com, mingo@...hat.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:sched/core] sched: Fix the place where group powers are updated

Commit-ID:  871e35bc9733f273eaf5ceb69bbd0423b58e5285
Gitweb:     http://git.kernel.org/tip/871e35bc9733f273eaf5ceb69bbd0423b58e5285
Author:     Gautham R Shenoy <ego@...ibm.com>
AuthorDate: Wed, 20 Jan 2010 14:02:44 -0600
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 21 Jan 2010 13:40:17 +0100

sched: Fix the place where group powers are updated

We want to update the sched_group_powers when balance_cpu == this_cpu.

Currently the group powers are updated only if the balance_cpu is the
first CPU in the local group. But balance_cpu = this_cpu could also be
the first idle cpu in the group. Hence fix the place where the group
powers are updated.

Signed-off-by: Gautham R Shenoy <ego@...ibm.com>
Signed-off-by: Joel Schopp <jschopp@...tin.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
LKML-Reference: <1264017764.5717.127.camel@...hopp-laptop>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched_fair.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 0b482f5..22231cc 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -2418,11 +2418,8 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
 	unsigned long sum_avg_load_per_task;
 	unsigned long avg_load_per_task;
 
-	if (local_group) {
+	if (local_group)
 		balance_cpu = group_first_cpu(group);
-		if (balance_cpu == this_cpu)
-			update_group_power(sd, this_cpu);
-	}
 
 	/* Tally up the load of all CPUs in the group */
 	sum_avg_load_per_task = avg_load_per_task = 0;
@@ -2470,6 +2467,8 @@ static inline void update_sg_lb_stats(struct sched_domain *sd,
 		return;
 	}
 
+	update_group_power(sd, this_cpu);
+
 	/* Adjust by relative CPU power of the group */
 	sgs->avg_load = (sgs->group_load * SCHED_LOAD_SCALE) / group->cpu_power;
 
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