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cpufreq: schedutil: restore cached freq when next_f is not changed

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We have the raw cached freq to reduce the chance in calling cpufreq
driver where it could be costly in some arch/SoC.

Currently, the raw cached freq is reset in sugov_update_single() when
it avoids frequency reduction (which is not desirable sometimes), but
it is better to restore the previous value of it in that case,
because it may not change in the next cycle and it is not necessary
to change the CPU frequency then.

Adapted from https://android-review.googlesource.com/1352810/

Signed-off-by: Wei Wang <wvw@google.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Subject edit and changelog rewrite ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Wei Wang 2020-10-16 11:17:22 -07:00 committed by Rafael J. Wysocki
parent 5368512abe
commit 0070ea2962
1 changed files with 3 additions and 2 deletions
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5
kernel/sched/cpufreq_schedutil.c
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@ -441,6 +441,7 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
unsigned long util, max;
unsigned int next_f;
bool busy;
unsigned int cached_freq = sg_policy->cached_raw_freq;
sugov_iowait_boost(sg_cpu, time, flags);
sg_cpu->last_update = time;
@ -464,8 +465,8 @@ static void sugov_update_single(struct update_util_data *hook, u64 time,
if (busy && next_f < sg_policy->next_freq) {
next_f = sg_policy->next_freq;
/* Reset cached freq as next_freq has changed */
sg_policy->cached_raw_freq = 0;
/* Restore cached freq as next_freq has changed */
sg_policy->cached_raw_freq = cached_freq;
}
/*