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Commit 7f436055 authored by Jin Qian's avatar Jin Qian Committed by Rafael J. Wysocki
Browse files

PM / wakeup: add a dummy wakeup_source to record statistics 



After a wakeup_source is destroyed, we lost all information such as how
long this wakeup_source has been active. Add a dummy wakeup_source to
record such info.

Signed-off-by: default avatarJin Qian <jinqian@android.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 87e9b9f1

drivers/base/power/wakeup.c

+36 −0
Original line number Diff line number Diff line
@@ -56,6 +56,11 @@ static LIST_HEAD(wakeup_sources); 


static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);



static struct wakeup_source deleted_ws = {

	.name = "deleted",

	.lock =  __SPIN_LOCK_UNLOCKED(deleted_ws.lock),

};



/**

 * wakeup_source_prepare - Prepare a new wakeup source for initialization.

 * @ws: Wakeup source to prepare.
@@ -107,6 +112,34 @@ void wakeup_source_drop(struct wakeup_source *ws) 
}

EXPORT_SYMBOL_GPL(wakeup_source_drop);



/*

 * Record wakeup_source statistics being deleted into a dummy wakeup_source.

 */

static void wakeup_source_record(struct wakeup_source *ws)

{

	unsigned long flags;



	spin_lock_irqsave(&deleted_ws.lock, flags);



	if (ws->event_count) {

		deleted_ws.total_time =

			ktime_add(deleted_ws.total_time, ws->total_time);

		deleted_ws.prevent_sleep_time =

			ktime_add(deleted_ws.prevent_sleep_time,

				  ws->prevent_sleep_time);

		deleted_ws.max_time =

			ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?

				deleted_ws.max_time : ws->max_time;

		deleted_ws.event_count += ws->event_count;

		deleted_ws.active_count += ws->active_count;

		deleted_ws.relax_count += ws->relax_count;

		deleted_ws.expire_count += ws->expire_count;

		deleted_ws.wakeup_count += ws->wakeup_count;

	}



	spin_unlock_irqrestore(&deleted_ws.lock, flags);

}



/**

 * wakeup_source_destroy - Destroy a struct wakeup_source object.

 * @ws: Wakeup source to destroy.
@@ -119,6 +152,7 @@ void wakeup_source_destroy(struct wakeup_source *ws) 
		return;



	wakeup_source_drop(ws);

	wakeup_source_record(ws);

	kfree(ws->name);

	kfree(ws);

}
@@ -912,6 +946,8 @@ static int wakeup_sources_stats_show(struct seq_file *m, void *unused) 
		print_wakeup_source_stats(m, ws);

	rcu_read_unlock();



	print_wakeup_source_stats(m, &deleted_ws);



	return 0;

}