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| author | Len Brown <len.brown@intel.com> | 2017-06-23 22:11:54 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-06-27 01:47:34 +0200 |
| commit | 82b4e03e01bc8def546b52707962809f04ae5c7a (patch) | |
| tree | 1dc5971444d0e81e2f931c0af7560ff2169223bb /drivers/cpufreq/intel_pstate.c | |
| parent | 62611cb912f7cb08ef7815780bcc20a09abedd20 (diff) | |
| download | talos-obmc-linux-82b4e03e01bc8def546b52707962809f04ae5c7a.tar.gz talos-obmc-linux-82b4e03e01bc8def546b52707962809f04ae5c7a.zip | |
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>
Diffstat (limited to 'drivers/cpufreq/intel_pstate.c')
| -rw-r--r-- | drivers/cpufreq/intel_pstate.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index b00a45595c89..1772d309bea9 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -2044,10 +2044,10 @@ static int intel_pstate_set_policy(struct cpufreq_policy *policy) */ intel_pstate_clear_update_util_hook(policy->cpu); intel_pstate_max_within_limits(cpu); + } else { + intel_pstate_set_update_util_hook(policy->cpu); } - intel_pstate_set_update_util_hook(policy->cpu); - if (hwp_active) intel_pstate_hwp_set(policy->cpu); |
