diff options
| author | Morten Rasmussen <morten.rasmussen@arm.com> | 2015-01-13 13:45:51 +0000 |
|---|---|---|
| committer | Amit Pundir <amit.pundir@linaro.org> | 2016-09-14 14:48:50 +0530 |
| commit | b043eb7320a9304f093224fdbb64419ed052b512 (patch) | |
| tree | 1d837e9a5a01a5aeaf765aafbffd83bb6b868b0d | |
| parent | 2fcba55ed9652ab9106fb92801583b890d3e49d3 (diff) | |
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 <mingo@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
| -rw-r--r-- | kernel/sched/fair.c | 5 | ||||
| -rw-r--r-- | kernel/sched/features.h | 5 |
2 files changed, 10 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 2dc28766cf9a..3fa6b311f93a 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4672,6 +4672,11 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg) #endif +static inline bool energy_aware(void) +{ + return sched_feat(ENERGY_AWARE); +} + /* * Detect M:N waker/wakee relationships via a switching-frequency heuristic. * A waker of many should wake a different task than the one last awakened diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 69631fa46c2f..b634151ce286 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -69,3 +69,8 @@ SCHED_FEAT(RT_RUNTIME_SHARE, true) SCHED_FEAT(LB_MIN, false) SCHED_FEAT(ATTACH_AGE_LOAD, true) +/* + * Energy aware scheduling. Use platform energy model to guide scheduling + * decisions optimizing for energy efficiency. + */ +SCHED_FEAT(ENERGY_AWARE, false) |