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cpufreq: schedutil: Reduce frequencies slower

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The schedutil governor reduces frequencies too fast in some
situations which cases undesirable performance drops to
appear.

To address that issue, make schedutil reduce the frequency slower by
setting it to the average of the value chosen during the previous
iteration of governor computations and the new one coming from its
frequency selection formula.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=194963
Reported-by: John <john.ettedgui@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Rafael J. Wysocki 2017-03-30 23:36:41 +02:00
parent 70e493f3bb
commit 39b64aa1c0
1 changed files with 3 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
kernel/sched/cpufreq_schedutil.c
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@ -101,6 +101,9 @@ static void sugov_update_commit(struct sugov_policy *sg_policy, u64 time,
if (sg_policy->next_freq == next_freq) if (sg_policy->next_freq == next_freq)
return; return;
if (sg_policy->next_freq > next_freq)
next_freq = (sg_policy->next_freq + next_freq) >> 1;
sg_policy->next_freq = next_freq; sg_policy->next_freq = next_freq;
sg_policy->last_freq_update_time = time; sg_policy->last_freq_update_time = time;