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.rasmus...@arm.com>
---
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 d3c73122..981406e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4215,6 +4215,11 @@ 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 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)
--
1.7.9.5
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