[tip:sched/core] sched: Provide arch_scale_freq_power

[tip-bot for Peter Zijlstra]

Commit-ID:  d6a59aa3a2b1ca8411884c833a313b33b5f76e20
Gitweb:     http://git.kernel.org/tip/d6a59aa3a2b1ca8411884c833a313b33b5f76e20
Author:     Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Wed, 2 Sep 2009 13:28:02 +0200
Committer:  Ingo Molnar <mingo@xxxxxxx>
CommitDate: Tue, 15 Sep 2009 16:51:24 +0200

sched: Provide arch_scale_freq_power

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

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
[ego@xxxxxxxxxx: spotting bugs]
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>


---
 kernel/sched.c |   21 +++++++++++++++++++--
 1 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index f0ccb8b..c210321 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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);
--
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