From: Morten Rasmussen <morten.rasmus...@arm.com>
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 <mi...@redhat.com>
cc: Peter Zijlstra <pet...@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmus...@arm.com>
Signed-off-by: Steve Muckle <smuc...@linaro.org>
---
kernel/sched/fair.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1093873..95b83c4 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4737,6 +4737,17 @@ 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
--
2.4.10
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