Commit 0951ec0f authored Mar 29, 2014 by Srivatsa Vaddagiri Committed by Steve Muckle Jul 22, 2014

sched: Influence cpu_power based on max_freq and efficiency



Update cpu_power metric of a cpu by accounting its efficiency and
max_freq factors. cpu_power is defined such that "least" performing
cpu (one with lowest efficiency and max_freq factor) gets cpu_power of
1024. Note that no single CPU may have both the lowest efficiency and
lowest max_freq. All CPUs will still have cpu_power values relative to
this combination receiving a cpu_power of 1024 however.

cpu_power differs from capacity metric of a cpu by accounting
real-time task activity.

Change-Id: I255d3ad80d8bc8237b9ffb8f6e7c0dc4c44ec10f
Signed-off-by: Srivatsa Vaddagiri <vatsa@codeaurora.org>

parent 03163c31

kernel/sched/fair.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -4412,7 +4412,7 @@ static inline int get_sd_load_idx(struct sched_domain *sd,

		static unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu)
		{
		return SCHED_POWER_SCALE;
		return capacity_scale_cpu_freq(cpu);
		}

		unsigned long __weak arch_scale_freq_power(struct sched_domain *sd, int cpu)
		@@ -4481,6 +4481,9 @@ static void update_cpu_power(struct sched_domain *sd, int cpu)

		sdg->sgp->power_orig = power;

		power *= capacity_scale_cpu_efficiency(cpu);
		power >>= SCHED_POWER_SHIFT;

		if (sched_feat(ARCH_POWER))
		power *= arch_scale_freq_power(sd, cpu);
		else