diff options
| author | morten.rasmussen@arm.com <morten.rasmussen@arm.com> | 2015-07-07 19:23:57 +0100 |
|---|---|---|
| committer | Vincent Guittot <vincent.guittot@linaro.org> | 2015-07-27 17:59:37 +0200 |
| commit | af4ce8102bd5d682a404ca49dbb8b1d4d9066df6 (patch) | |
| tree | 6d7e1051dfc474f989547db063f34290f406ff60 | |
| parent | 6e40e407a7cf89f8f79fa39f99fc3d56ab54464c (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 | 6 | ||||
| -rw-r--r-- | kernel/sched/features.h | 6 |
2 files changed, 12 insertions, 0 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index b13033062485..a44b423fe825 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4761,6 +4761,7 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg) return wl; } + #else static long effective_load(struct task_group *tg, int cpu, long wl, long wg) @@ -4770,6 +4771,11 @@ 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); +} + static int wake_wide(struct task_struct *p) { int factor = this_cpu_read(sd_llc_size); diff --git a/kernel/sched/features.h b/kernel/sched/features.h index 03d8072e8ab3..92bc36e0a66c 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -91,3 +91,9 @@ 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) |