Commit-ID: 9ee1cda5ee25c7dd82acf25892e0d229e818f8c7
Gitweb: http://git.kernel.org/tip/9ee1cda5ee25c7dd82acf25892e0d229e818f8c7
Author: Morten Rasmussen <morten.rasmussen@xxxxxxx>
AuthorDate: Mon, 25 Jul 2016 14:34:24 +0100
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 18 Aug 2016 11:26:55 +0200
sched/core: Enable SD_BALANCE_WAKE for asymmetric capacity systems
A domain with the SD_ASYM_CPUCAPACITY flag set indicate that
sched_groups at this level and below do not include CPUs of all
capacities available (e.g. group containing little-only or big-only CPUs
in big.LITTLE systems). It is therefore necessary to put in more effort
in finding an appropriate CPU at task wake-up by enabling balancing at
wake-up (SD_BALANCE_WAKE) on all lower (child) levels.
Signed-off-by: Morten Rasmussen <morten.rasmussen@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: dietmar.eggemann@xxxxxxx
Cc: freedom.tan@xxxxxxxxxxxx
Cc: keita.kobayashi.ym@xxxxxxxxxxx
Cc: mgalbraith@xxxxxxx
Cc: sgurrappadi@xxxxxxxxxx
Cc: vincent.guittot@xxxxxxxxxx
Cc: yuyang.du@xxxxxxxxx
Link: http://lkml.kernel.org/r/1469453670-2660-8-git-send-email-morten.rasmussen@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/core.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 5739465..4695df6 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6444,6 +6444,13 @@ sd_init(struct sched_domain_topology_level *tl,
* Convert topological properties into behaviour.
*/
+ if (sd->flags & SD_ASYM_CPUCAPACITY) {
+ struct sched_domain *t = sd;
+
+ for_each_lower_domain(t)
+ t->flags |= SD_BALANCE_WAKE;
+ }
+
if (sd->flags & SD_SHARE_CPUCAPACITY) {
sd->flags |= SD_PREFER_SIBLING;
sd->imbalance_pct = 110;
--
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