From: Morten Rasmussen Date: Tue, 13 Jan 2015 13:45:51 +0000 (+0000) Subject: sched: Make energy awareness a sched feature X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=29e622f15b89b2a8ea14c1dc094dbf9070eae7c1;p=platform%2Fkernel%2Flinux-exynos.git sched: Make energy awareness a sched feature This patch introduces the ENERGY_AWARE sched feature, which is implemented using jump labels when SCHED_DEBUG is defined. It is statically set false when SCHED_DEBUG is not defined. Hence this doesn't allow energy awareness to be enabled without SCHED_DEBUG. This sched_feature knob will be replaced later with a more appropriate control knob when things have matured a bit. ENERGY_AWARE is based on per-entity load-tracking hence FAIR_GROUP_SCHED must be enable. This dependency isn't checked at compile time yet. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen Signed-off-by: Lukasz Luba --- diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 22aa011ae29f..8b6632e6d771 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5610,6 +5610,11 @@ static void record_wakee(struct task_struct *p) } } +static inline bool energy_aware(void) +{ + return sched_feat(ENERGY_AWARE); +} + /* * Detect M:N waker/wakee relationships via a switching-frequency heuristic. * diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 9552fd5854bf..8be01be159f6 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -85,3 +85,9 @@ SCHED_FEAT(ATTACH_AGE_LOAD, true) SCHED_FEAT(WA_IDLE, true) SCHED_FEAT(WA_WEIGHT, true) SCHED_FEAT(WA_BIAS, true) + +/* + * Energy aware scheduling. Use platform energy model to guide scheduling + * decisions optimizing for energy efficiency. + */ +SCHED_FEAT(ENERGY_AWARE, false)