linux-kernel - [RFC][PATCH 5/9] sched: Make idle_balance() skip cpus with a cpu

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Message-Id: <1373385338-12983-6-git-send-email-morten.rasmussen@arm.com>
Date:	Tue,  9 Jul 2013 16:55:34 +0100
From:	Morten Rasmussen <morten.rasmussen@....com>
To:	mingo@...nel.org, peterz@...radead.org
Cc:	arjan@...ux.intel.com, vincent.guittot@...aro.org,
	preeti@...ux.vnet.ibm.com, alex.shi@...el.com, efault@....de,
	pjt@...gle.com, len.brown@...el.com, corbet@....net,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	tglx@...utronix.de, catalin.marinas@....com,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	morten.rasmussen@....com
Subject: [RFC][PATCH 5/9] sched: Make idle_balance() skip cpus with a cpu_power of 1

idle_balance() should disregard cpus disabled by the power scheduler.

This is a quick fix. idle_balance() should be revisit to implement proper
handling of cpus with cpu_power=1.

Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
CC: Ingo Molnar <mingo@...nel.org>
CC: Peter Zijlstra <peterz@...radead.org>
CC: Catalin Marinas <catalin.marinas@....com>
---
 kernel/sched/fair.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 4610463..a59617b 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5261,6 +5261,10 @@ void idle_balance(int this_cpu, struct rq *this_rq)
 	if (this_rq->avg_idle < sysctl_sched_migration_cost)
 		return;
 
+	/* Don't pull tasks if disable by power scheduler */
+	if (!power_cpu_balance(this_cpu))
+		return;
+
 	/*
 	 * Drop the rq->lock, but keep IRQ/preempt disabled.
 	 */
-- 
1.7.9.5


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