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cpuidle: Add 'above' and 'below' idle state metrics

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Add two new metrics for CPU idle states, "above" and "below", to count
the number of times the given state had been asked for (or entered
from the kernel's perspective), but the observed idle duration turned
out to be too short or too long for it (respectively).

These metrics help to estimate the quality of the CPU idle governor
in use.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Rafael J. Wysocki
2018-12-10 12:30:23 +01:00
parent 9456823c84
commit 04dab58a39
5 changed files with 55 additions and 1 deletions
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7
Documentation/ABI/testing/sysfs-devices-system-cpu
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@@ -145,6 +145,8 @@ What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/name
/sys/devices/system/cpu/cpuX/cpuidle/stateN/power
/sys/devices/system/cpu/cpuX/cpuidle/stateN/time
/sys/devices/system/cpu/cpuX/cpuidle/stateN/usage
/sys/devices/system/cpu/cpuX/cpuidle/stateN/above
/sys/devices/system/cpu/cpuX/cpuidle/stateN/below
Date: September 2007
KernelVersion: v2.6.24
Contact: Linux power management list <linux-pm@vger.kernel.org>
@@ -166,6 +168,11 @@ Description:
usage: (RO) Number of times this state was entered (a count).
above: (RO) Number of times this state was entered, but the
observed CPU idle duration was too short for it (a count).
below: (RO) Number of times this state was entered, but the
observed CPU idle duration was too long for it (a count).
What: /sys/devices/system/cpu/cpuX/cpuidle/stateN/desc
Date: February 2008