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| author | Morten Rasmussen <morten.rasmussen@arm.com> | 2016-07-25 14:34:24 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-08-18 11:26:55 +0200 |
| commit | 9ee1cda5ee25c7dd82acf25892e0d229e818f8c7 (patch) | |
| tree | 0b9a59fce5180742ecf67b5644b9255fc3879374 /kernel/sched | |
| parent | 3676b13e8524c576825fe1e731e347dba0083888 (diff) | |
| download | linux-9ee1cda5ee25c7dd82acf25892e0d229e818f8c7.tar.gz linux-9ee1cda5ee25c7dd82acf25892e0d229e818f8c7.tar.bz2 linux-9ee1cda5ee25c7dd82acf25892e0d229e818f8c7.zip | |
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@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dietmar.eggemann@arm.com
Cc: freedom.tan@mediatek.com
Cc: keita.kobayashi.ym@renesas.com
Cc: mgalbraith@suse.de
Cc: sgurrappadi@nvidia.com
Cc: vincent.guittot@linaro.org
Cc: yuyang.du@intel.com
Link: http://lkml.kernel.org/r/1469453670-2660-8-git-send-email-morten.rasmussen@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 57394650c6ab..4695df6ed752 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; |