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Commit d6a59aa3 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

sched: Provide arch_scale_freq_power 



Provide an ach specific hook for cpufreq based scaling of
cpu_power.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
[ego@in.ibm.com: spotting bugs]
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent b8a543ea

kernel/sched.c

+19 −2
Original line number Diff line number Diff line
@@ -3552,7 +3552,18 @@ static inline int check_power_save_busiest_group(struct sd_lb_stats *sds, 
}

#endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */



unsigned long __weak arch_scale_smt_power(struct sched_domain *sd, int cpu)



unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu)

{

	return SCHED_LOAD_SCALE;

}



unsigned long __weak arch_scale_freq_power(struct sched_domain *sd, int cpu)

{

	return default_scale_freq_power(sd, cpu);

}



unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu)

{

	unsigned long weight = cpumask_weight(sched_domain_span(sd));

	unsigned long smt_gain = sd->smt_gain;
@@ -3562,6 +3573,11 @@ unsigned long __weak arch_scale_smt_power(struct sched_domain *sd, int cpu) 
	return smt_gain;

}



unsigned long __weak arch_scale_smt_power(struct sched_domain *sd, int cpu)

{

	return default_scale_smt_power(sd, cpu);

}



unsigned long scale_rt_power(int cpu)

{

	struct rq *rq = cpu_rq(cpu);
@@ -3586,7 +3602,8 @@ static void update_cpu_power(struct sched_domain *sd, int cpu) 
	unsigned long power = SCHED_LOAD_SCALE;

	struct sched_group *sdg = sd->groups;



	/* here we could scale based on cpufreq */

	power *= arch_scale_freq_power(sd, cpu);

	power >>= SCHED_LOAD_SHIFT;



	if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) {

		power *= arch_scale_smt_power(sd, cpu);