linux-kernel - [RFC PATCH 12/13] sched: Modify find_idlest

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Date:	Thu, 25 Oct 2012 15:56:11 +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 12/13] sched: Modify find_idlest_cpu to use PJT's metric

Additional parameters introduced to perform this function which are
calculated using PJT's metrics and its helpers.

Signed-off-by: Preeti U Murthy <preeti@...ux.vnet.ibm.com>
---
 kernel/sched/fair.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index c64be1c1..15ec528 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3230,16 +3230,18 @@ find_idlest_group(struct sched_domain *sd, struct task_struct *p,
 static int
 find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
 {
-	unsigned long load, min_load = ULONG_MAX;
+	unsigned long load;
+	u64 cpu_load, min_cpu_load = ~0ULL;
 	int idlest = -1;
 	int i;
 
 	/* Traverse only the allowed CPUs */
 	for_each_cpu_and(i, sched_group_cpus(group), tsk_cpus_allowed(p)) {
 		load = weighted_cpuload(i);
+		cpu_load = cpu_rq(i)->cfs.runnable_load_avg;
 
-		if (load < min_load || (load == min_load && i == this_cpu)) {
-			min_load = load;
+		if (cpu_load < min_cpu_load || (cpu_load == min_cpu_load && i == this_cpu)) {
+			min_cpu_load = cpu_load;
 			idlest = i;
 		}
 	}

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