intel_pstate: skip scheduler hook when in "performance" mode
When the governor is set to "performance", intel_pstate does not need the scheduler hook for doing any calculations. Under these conditions, its only purpose is to continue to maintain cpufreq/scaling_cur_freq. The cpufreq/scaling_cur_freq sysfs attribute is now provided by shared x86 cpufreq code on modern x86 systems, including all systems supported by the intel_pstate driver. So in "performance" governor mode, the scheduler hook can be skipped. This applies to both in Software and Hardware P-state control modes. Suggested-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -2044,10 +2044,10 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy)
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*/
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intel_pstate_clear_update_util_hook(policy->cpu);
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intel_pstate_max_within_limits(cpu);
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} else {
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intel_pstate_set_update_util_hook(policy->cpu);
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}
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intel_pstate_set_update_util_hook(policy->cpu);
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if (hwp_active)
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intel_pstate_hwp_set(policy->cpu);
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