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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>
This commit is contained in:
Jin Qian 2015-05-15 18:10:37 -07:00 committed by Rafael J. Wysocki
parent 87e9b9f1d8
commit 7f436055cb
1 changed files with 36 additions and 0 deletions
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36
drivers/base/power/wakeup.c
View File

@ -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;
}