From caff37ef96eac7fe96a582d032f6958e834e9447 Mon Sep 17 00:00:00 2001 From: Vincent Guittot Date: Fri, 27 Feb 2015 16:54:13 +0100 Subject: [PATCH] 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 Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Preeti U. Murthy Cc: Morten.Rasmussen@arm.com Cc: dietmar.eggemann@arm.com Cc: efault@gmx.de Cc: kamalesh@linux.vnet.ibm.com Cc: linaro-kernel@lists.linaro.org Cc: nicolas.pitre@linaro.org Cc: riel@redhat.com Link: http://lkml.kernel.org/r/1425052454-25797-11-git-send-email-vincent.guittot@linaro.org Signed-off-by: Ingo Molnar --- kernel/sched/core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 838fc9d1e7ab..043e2a13b8b9 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% */ -- 2.20.1