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>
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 7b5ad9a..87c2603 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -56,6 +56,11 @@
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 @@
}
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 @@
return;
wakeup_source_drop(ws);
+ wakeup_source_record(ws);
kfree(ws->name);
kfree(ws);
}
@@ -912,6 +946,8 @@
print_wakeup_source_stats(m, ws);
rcu_read_unlock();
+ print_wakeup_source_stats(m, &deleted_ws);
+
return 0;
}