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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-09-03 13:20:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-15 16:51:28 +0200 |
| commit | 8e6598af3f35629c37249a610cf13e73f70db279 (patch) | |
| tree | a341d416329f5331e4f7c6834d637266ba389b78 | |
| parent | 47fe38fcff0517e67d395c039d2e26d2de688a60 (diff) | |
| download | linux-8e6598af3f35629c37249a610cf13e73f70db279.tar.gz linux-8e6598af3f35629c37249a610cf13e73f70db279.tar.bz2 linux-8e6598af3f35629c37249a610cf13e73f70db279.zip | |
sched: Feature to disable APERF/MPERF cpu_power
I suspect a feed-back loop between cpuidle and the aperf/mperf
cpu_power bits, where when we have idle C-states lower the ratio,
which leads to lower cpu_power and then less load, which generates
more idle time, etc..
Put in a knob to disable it.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | kernel/sched.c | 12 | ||||
| -rw-r--r-- | kernel/sched_features.h | 5 |
2 files changed, 15 insertions, 2 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index c210321adcb9..e8e603bf8761 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3602,11 +3602,19 @@ static void update_cpu_power(struct sched_domain *sd, int cpu) unsigned long power = SCHED_LOAD_SCALE; struct sched_group *sdg = sd->groups; - power *= arch_scale_freq_power(sd, cpu); + if (sched_feat(ARCH_POWER)) + power *= arch_scale_freq_power(sd, cpu); + else + power *= default_scale_freq_power(sd, cpu); + power >>= SCHED_LOAD_SHIFT; if ((sd->flags & SD_SHARE_CPUPOWER) && weight > 1) { - power *= arch_scale_smt_power(sd, cpu); + if (sched_feat(ARCH_POWER)) + power *= arch_scale_smt_power(sd, cpu); + else + power *= default_scale_smt_power(sd, cpu); + power >>= SCHED_LOAD_SHIFT; } diff --git a/kernel/sched_features.h b/kernel/sched_features.h index e98c2e8de1d5..294e10edd3c8 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -82,6 +82,11 @@ SCHED_FEAT(LAST_BUDDY, 1) */ SCHED_FEAT(CACHE_HOT_BUDDY, 1) +/* + * Use arch dependent cpu power functions + */ +SCHED_FEAT(ARCH_POWER, 0) + SCHED_FEAT(HRTICK, 0) SCHED_FEAT(DOUBLE_TICK, 0) SCHED_FEAT(LB_BIAS, 1) |