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Date: Tue, 7 Jul 2015 19:24:02 +0100
From: Morten Rasmussen <morten.rasmussen@....com>
To: peterz@...radead.org, mingo@...hat.com
Cc: vincent.guittot@...aro.org, daniel.lezcano@...aro.org,
Dietmar Eggemann <Dietmar.Eggemann@....com>,
yuyang.du@...el.com, mturquette@...libre.com, rjw@...ysocki.net,
Juri Lelli <Juri.Lelli@....com>, sgurrappadi@...dia.com,
pang.xunlei@....com.cn, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: [RFCv5 PATCH 19/46] sched: Compute cpu capacity available at current frequency
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@...hat.com>
cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
---
kernel/sched/fair.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index a95dad9..70f81fc 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4791,6 +4791,17 @@ 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;
+}
+
static inline bool energy_aware(void)
{
return sched_feat(ENERGY_AWARE);
--
1.9.1
--
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