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Fix a cpufreq related performance regression on certain systems,

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where the CPU would remain at the lowest frequency, degrading
 performance substantially.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-urgent-2024-01-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fix from Ingo Molnar:
 "Fix a cpufreq related performance regression on certain systems, where
  the CPU would remain at the lowest frequency, degrading performance
  substantially"

* tag 'sched-urgent-2024-01-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/fair: Fix frequency selection for non-invariant case
This commit is contained in:
Linus Torvalds 2024-01-18 11:57:33 -08:00
commit b0d326da46
1 changed files with 5 additions and 1 deletions
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6
kernel/sched/cpufreq_schedutil.c
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@ -133,7 +133,11 @@ unsigned long get_capacity_ref_freq(struct cpufreq_policy *policy)
if (arch_scale_freq_invariant())
return policy->cpuinfo.max_freq;
return policy->cur;
/*
* Apply a 25% margin so that we select a higher frequency than
* the current one before the CPU is fully busy:
*/
return policy->cur + (policy->cur >> 2);
}
/**