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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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10
Documentation/admin-guide/pm/cpuidle.rst
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@@ -398,6 +398,16 @@ deeper the (effective) idle state represented by it. Each of them contains
a number of files (attributes) representing the properties of the idle state
object corresponding to it, as follows:
``above``
Total number of times this idle state had been asked for, but the
observed idle duration was certainly too short to match its target
residency.
``below``
Total number of times this idle state had been asked for, but cerainly
a deeper idle state would have been a better match for the observed idle
duration.
``desc``
Description of the idle state.