From: Morten Rasmussen morten.rasmussen@arm.com
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.
Signed-off-by: Morten Rasmussen morten.rasmussen@arm.com Signed-off-by: Mike Turquette mturquette@linaro.org [mturquette@linaro.org: moved energy_aware above enqueue_task_fair] --- kernel/sched/fair.c | 5 +++++ kernel/sched/features.h | 6 ++++++ 2 files changed, 11 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6738160..90b36cc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -3978,6 +3978,11 @@ static inline void hrtick_update(struct rq *rq) } #endif
+static inline bool energy_aware(void) +{ + return sched_feat(ENERGY_AWARE); +} + /* * The enqueue_task method is called before nr_running is * increased. Here we update the fair scheduling stats and diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 90284d1..199ee3a 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -83,3 +83,9 @@ SCHED_FEAT(NUMA_FAVOUR_HIGHER, true) */ SCHED_FEAT(NUMA_RESIST_LOWER, false) #endif + +/* + * Energy aware scheduling. Use platform energy model to guide scheduling + * decisions optimizing for energy efficiency. + */ +SCHED_FEAT(ENERGY_AWARE, false)