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authorRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-03-14 14:27:21 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2018-03-29 14:06:08 +0300
commit64bdff698092aa6be28c3b248f887022eec77902 (patch)
tree312a8e3d256011d26204fce782f481aeaa5a58e2 /drivers/cpuidle/cpuidle.c
parent8919d779f1fd1ea8b06a46249f1a13c835b736af (diff)
downloadlinux-64bdff698092aa6be28c3b248f887022eec77902.tar.xz
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.c9
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++;
}
/**