Commit 8b35ef45 authored Jan 13, 2015 by Morten Rasmussen Committed by Dmitry Shmidt Jan 31, 2017

ANDROID: 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@redhat.com>
cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Morten Rasmussen <morten.rasmussen@arm.com>
Signed-off-by: Andres Oportus <andresoportus@google.com>

parent 1f998b35

kernel/sched/fair.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -5104,6 +5104,17 @@ static void record_wakee(struct task_struct *p)
		}
		}

		/*
		* 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);