Commit-ID: 9ee1cda5ee25c7dd82acf25892e0d229e818f8c7 Gitweb: http://git.kernel.org/tip/9ee1cda5ee25c7dd82acf25892e0d229e818f8c7 Author: Morten Rasmussen <[email protected]> AuthorDate: Mon, 25 Jul 2016 14:34:24 +0100 Committer: Ingo Molnar <[email protected]> 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 <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- 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;
