This patch introduces the SCHED_ENERGY_FREQ sched feature, which is implemented using jump labels when SCHED_DEBUG is defined. It is statically set to false when SCHED_DEBUG is not defined and thus disabled by default.
Signed-off-by: Michael Turquette mturquette@linaro.org --- changes since internal v1: none
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 46855d0..75aec8d 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4207,6 +4207,11 @@ static inline void hrtick_update(struct rq *rq) } #endif
+static inline bool sched_energy_freq(void) +{ + return sched_feat(SCHED_ENERGY_FREQ); +} + /* * 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 91e33cd..77381cf 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -96,3 +96,9 @@ SCHED_FEAT(NUMA_FAVOUR_HIGHER, true) */ SCHED_FEAT(NUMA_RESIST_LOWER, false) #endif + +/* + * Scheduler-driven CPU frequency selection aimed to save energy based on + * load tracking + */ +SCHED_FEAT(SCHED_ENERGY_FREQ, false) -- 1.9.1