diff options
| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-03-14 12:27:21 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2018-03-29 13:06:08 +0200 |
| commit | 64bdff698092aa6be28c3b248f887022eec77902 (patch) | |
| tree | 312a8e3d256011d26204fce782f481aeaa5a58e2 /Documentation/ABI/testing/sysfs-devices-system-cpu | |
| parent | 8919d779f1fd1ea8b06a46249f1a13c835b736af (diff) | |
PM: cpuidle/suspend: Add s2idle usage and time state attributes
Add a new attribute group called "s2idle" under the sysfs directory
of each cpuidle state that supports the ->enter_s2idle callback
and put two new attributes, "usage" and "time", into that group to
represent the number of times the given state was requested for
suspend-to-idle and the total time spent in suspend-to-idle after
requesting that state, respectively.
That will allow diagnostic information related to suspend-to-idle
to be collected without enabling advanced debug features and
analyzing dmesg output.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-devices-system-cpu')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-cpu | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu index 4ed63b6cfb15..025b7cf3768d 100644 --- a/Documentation/ABI/testing/sysfs-devices-system-cpu +++ b/Documentation/ABI/testing/sysfs-devices-system-cpu @@ -198,6 +198,31 @@ Description: time (in microseconds) this cpu should spend in this idle state to make the transition worth the effort. +What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/s2idle/ +Date: March 2018 +KernelVersion: v4.17 +Contact: Linux power management list <linux-pm@vger.kernel.org> +Description: + Idle state usage statistics related to suspend-to-idle. + + This attribute group is only present for states that can be + used in suspend-to-idle with suspended timekeeping. + +What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/s2idle/time +Date: March 2018 +KernelVersion: v4.17 +Contact: Linux power management list <linux-pm@vger.kernel.org> +Description: + Total time spent by the CPU in suspend-to-idle (with scheduler + tick suspended) after requesting this state. + +What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/s2idle/usage +Date: March 2018 +KernelVersion: v4.17 +Contact: Linux power management list <linux-pm@vger.kernel.org> +Description: + Total number of times this state has been requested by the CPU + while entering suspend-to-idle. What: /sys/devices/system/cpu/cpu#/cpufreq/* Date: pre-git history |