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authorPali Rohár <pali.rohar@gmail.com>2014-10-16 01:16:51 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-14 08:47:58 -0800
commit4bf70f9f0280e5f396e4338967982c4325167259 (patch)
tree3fff4569252d4895afddd27c5fddb402cd2d161f /include/linux/oom.h
parent57ce0ed4fba064145d497dc901bee4f74cfc5c25 (diff)
downloadlinux-linaro-stable-4bf70f9f0280e5f396e4338967982c4325167259.tar.gz
cpufreq: intel_pstate: Fix setting max_perf_pct in performance policy
commit 36b4bed5cd8f6e17019fa7d380e0836872c7b367 upstream. Code which changes policy to powersave changes also max_policy_pct based on max_freq. Code which change max_perf_pct has upper limit base on value max_policy_pct. When policy is changing from powersave back to performance then max_policy_pct is not changed. Which means that changing max_perf_pct is not possible to high values if max_freq was too low in powersave policy. Test case: $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq 800000 $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 3300000 $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor performance $ cat /sys/devices/system/cpu/intel_pstate/max_perf_pct 100 $ echo powersave > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor $ echo 800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq $ echo 20 > /sys/devices/system/cpu/intel_pstate/max_perf_pct $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor powersave $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 800000 $ cat /sys/devices/system/cpu/intel_pstate/max_perf_pct 20 $ echo performance > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor $ echo 3300000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq $ echo 100 > /sys/devices/system/cpu/intel_pstate/max_perf_pct $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor performance $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq 3300000 $ cat /sys/devices/system/cpu/intel_pstate/max_perf_pct 24 And now intel_pstate driver allows to set maximal value for max_perf_pct based on max_policy_pct which is 24 for previous powersave max_freq 800000. This patch will set default value for max_policy_pct when setting policy to performance so it will allow to set also max value for max_perf_pct. Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Acked-by: Dirk Brandewie <dirk.j.brandewie@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/oom.h')
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