From 64bdff698092aa6be28c3b248f887022eec77902 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 14 Mar 2018 12:27:21 +0100 Subject: 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 --- drivers/cpuidle/cpuidle.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/cpuidle/cpuidle.c') 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++; } /** -- cgit v1.2.3