linux-kernel - [RFCv3 PATCH 09/48] sched: add SD_PREFER

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Message-Id: <1423074685-6336-10-git-send-email-morten.rasmussen@arm.com>
Date:	Wed,  4 Feb 2015 18:30:46 +0000
From:	Morten Rasmussen <morten.rasmussen@....com>
To:	peterz@...radead.org, mingo@...hat.com
Cc:	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	yuyang.du@...el.com, preeti@...ux.vnet.ibm.com,
	mturquette@...aro.org, nico@...aro.org, rjw@...ysocki.net,
	juri.lelli@....com, linux-kernel@...r.kernel.org
Subject: [RFCv3 PATCH 09/48] sched: add SD_PREFER_SIBLING for SMT level

From: Vincent Guittot <vincent.guittot@...aro.org>

Add the SD_PREFER_SIBLING flag for SMT level in order to ensure that
the scheduler will put at least 1 task per core.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Reviewed-by: Preeti U. Murthy <preeti@...ux.vnet.ibm.com>
---
 kernel/sched/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 252011d..a00a4c3 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6236,6 +6236,7 @@ sd_init(struct sched_domain_topology_level *tl, int cpu)
 	 */
 
 	if (sd->flags & SD_SHARE_CPUCAPACITY) {
+		sd->flags |= SD_PREFER_SIBLING;
 		sd->imbalance_pct = 110;
 		sd->smt_gain = 1178; /* ~15% */
 
-- 
1.9.1

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