linux-kernel - [tip:sched/core] sched: Add SD_PREFER

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Message-ID: <tip-caff37ef96eac7fe96a582d032f6958e834e9447@git.kernel.org>
Date:	Fri, 27 Mar 2015 04:42:38 -0700
From:	tip-bot for Vincent Guittot <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tglx@...utronix.de, preeti@...ux.vnet.ibm.com, mingo@...nel.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org, hpa@...or.com,
	vincent.guittot@...aro.org
Subject: [tip:sched/core] sched: Add SD_PREFER_SIBLING for SMT level

Commit-ID:  caff37ef96eac7fe96a582d032f6958e834e9447
Gitweb:     http://git.kernel.org/tip/caff37ef96eac7fe96a582d032f6958e834e9447
Author:     Vincent Guittot <vincent.guittot@...aro.org>
AuthorDate: Fri, 27 Feb 2015 16:54:13 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 27 Mar 2015 09:36:05 +0100

sched: Add SD_PREFER_SIBLING for SMT level

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

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Preeti U. Murthy <preeti@...ux.vnet.ibm.com>
Cc: Morten.Rasmussen@....com
Cc: dietmar.eggemann@....com
Cc: efault@....de
Cc: kamalesh@...ux.vnet.ibm.com
Cc: linaro-kernel@...ts.linaro.org
Cc: nicolas.pitre@...aro.org
Cc: riel@...hat.com
Link: http://lkml.kernel.org/r/1425052454-25797-11-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 838fc9d..043e2a1 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6240,6 +6240,7 @@ 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% */
 
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