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| 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 /drivers/cpuidle/cpuidle.c | |
| parent | cpuidle: Enable coupled cpuidle support on Exynos3250 platform (diff) | |
| download | linux-64bdff698092aa6be28c3b248f887022eec77902.tar.xz linux-64bdff698092aa6be28c3b248f887022eec77902.zip | |
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 'drivers/cpuidle/cpuidle.c')
| -rw-r--r-- | drivers/cpuidle/cpuidle.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 68a16827f45f..0003e9a02637 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -131,6 +131,10 @@ int cpuidle_find_deepest_state(struct cpuidle_driver *drv, static void enter_s2idle_proper(struct cpuidle_driver *drv, struct cpuidle_device *dev, int index) { + ktime_t time_start, time_end; + + time_start = ns_to_ktime(local_clock()); + /* * trace_suspend_resume() called by tick_freeze() for the last CPU * executing it contains RCU usage regarded as invalid in the idle @@ -152,6 +156,11 @@ static void enter_s2idle_proper(struct cpuidle_driver *drv, */ RCU_NONIDLE(tick_unfreeze()); start_critical_timings(); + + time_end = ns_to_ktime(local_clock()); + + dev->states_usage[index].s2idle_time += ktime_us_delta(time_end, time_start); + dev->states_usage[index].s2idle_usage++; } /** |