[RFCv7 PATCH 01/10] sched: Compute cpu capacity available at current frequency
From: Steve Muckle <hidden>
Date: 2016-02-23 01:26:03
Also in:
lkml
Subsystem:
scheduler, the rest · Maintainers:
Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds
From: Morten Rasmussen <redacted> capacity_orig_of() returns the max available compute capacity of a cpu. For scale-invariant utilization tracking and energy-aware scheduling decisions it is useful to know the compute capacity available at the current OPP of a cpu. cc: Ingo Molnar <mingo@redhat.com> cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Morten Rasmussen <redacted> Signed-off-by: Steve Muckle <redacted> --- kernel/sched/fair.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 7ce24a4..3437e01 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c@@ -4821,6 +4821,17 @@ static long effective_load(struct task_group *tg, int cpu, long wl, long wg) #endif /* + * Returns the current capacity of cpu after applying both + * cpu and freq scaling. + */ +static unsigned long capacity_curr_of(int cpu) +{ + return cpu_rq(cpu)->cpu_capacity_orig * + arch_scale_freq_capacity(NULL, cpu) + >> SCHED_CAPACITY_SHIFT; +} + +/* * 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 * at a frequency roughly N times higher than one of its wakees. In order
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2.4.10