linux-kernel - [RFC PATCH 08/13] sched: Some miscallaneous changes in load

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Message-ID: <20121025102549.21022.81965.stgit@preeti.in.ibm.com>
Date:	Thu, 25 Oct 2012 15:55:49 +0530
From:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
To:	svaidy@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, venki@...gle.com, robin.randhawa@....com,
	linaro-dev@...ts.linaro.org, a.p.zijlstra@...llo.nl,
	mjg59@...f.ucam.org, viresh.kumar@...aro.org,
	akpm@...ux-foundation.org, amit.kucheria@...aro.org,
	deepthi@...ux.vnet.ibm.com, paul.mckenney@...aro.org,
	arjan@...ux.intel.com, paulmck@...ux.vnet.ibm.com,
	srivatsa.bhat@...ux.vnet.ibm.com, vincent.guittot@...aro.org,
	tglx@...utronix.de, Arvind.Chauhan@....com, pjt@...gle.com,
	Morten.Rasmussen@....com, linux-arm-kernel@...ts.infradead.org,
	suresh.b.siddha@...el.com
Subject: [RFC PATCH 08/13] sched: Some miscallaneous changes in load_balance

Modify certain decisions in load_balance to use the imbalance
amount as calculated by the PJT's metric.

Signed-off-by: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
---
 kernel/sched/fair.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index bd7b69d..68a6b1d 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5284,7 +5284,10 @@ more_balance:
 		 * moreover subsequent load balance cycles should correct the
 		 * excess load moved.
 		 */
-		if ((env.flags & LBF_SOME_PINNED) && env.imbalance > 0 &&
+		/*
+		 * The following decision based on PJT's metric
+ 		 */
+		if ((env.flags & LBF_SOME_PINNED) && env.load_imbalance > 0 &&
 				lb_iterations++ < max_lb_iterations) {
 
 			env.dst_rq	 = cpu_rq(env.new_dst_cpu);

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