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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: Jin Qian <jinqian@android.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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1 changed files with 36 additions and 0 deletions
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@ -56,6 +56,11 @@ static LIST_HEAD(wakeup_sources);
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static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
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static struct wakeup_source deleted_ws = {
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.name = "deleted",
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.lock = __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
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};
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/**
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* wakeup_source_prepare - Prepare a new wakeup source for initialization.
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* @ws: Wakeup source to prepare.
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@ -107,6 +112,34 @@ void wakeup_source_drop(struct wakeup_source *ws)
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}
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EXPORT_SYMBOL_GPL(wakeup_source_drop);
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/*
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* Record wakeup_source statistics being deleted into a dummy wakeup_source.
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*/
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static void wakeup_source_record(struct wakeup_source *ws)
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{
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unsigned long flags;
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spin_lock_irqsave(&deleted_ws.lock, flags);
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if (ws->event_count) {
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deleted_ws.total_time =
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ktime_add(deleted_ws.total_time, ws->total_time);
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deleted_ws.prevent_sleep_time =
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ktime_add(deleted_ws.prevent_sleep_time,
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ws->prevent_sleep_time);
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deleted_ws.max_time =
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ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
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deleted_ws.max_time : ws->max_time;
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deleted_ws.event_count += ws->event_count;
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deleted_ws.active_count += ws->active_count;
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deleted_ws.relax_count += ws->relax_count;
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deleted_ws.expire_count += ws->expire_count;
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deleted_ws.wakeup_count += ws->wakeup_count;
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}
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spin_unlock_irqrestore(&deleted_ws.lock, flags);
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}
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/**
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* wakeup_source_destroy - Destroy a struct wakeup_source object.
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* @ws: Wakeup source to destroy.
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@ -119,6 +152,7 @@ void wakeup_source_destroy(struct wakeup_source *ws)
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return;
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wakeup_source_drop(ws);
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wakeup_source_record(ws);
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kfree(ws->name);
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kfree(ws);
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}
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@ -912,6 +946,8 @@ static int wakeup_sources_stats_show(struct seq_file *m, void *unused)
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print_wakeup_source_stats(m, ws);
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rcu_read_unlock();
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print_wakeup_source_stats(m, &deleted_ws);
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return 0;
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}
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