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 <jinq...@android.com>
---
drivers/base/power/wakeup.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index bdb45f3..732683c 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -59,6 +59,11 @@ static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
static ktime_t last_read_time;
+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.
@@ -110,6 +115,33 @@ 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.max_time =
+ ktime_add(deleted_ws.max_time, ws->max_time);
+ deleted_ws.prevent_sleep_time =
+ ktime_add(deleted_ws.prevent_sleep_time,
+ ws->prevent_sleep_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.
@@ -122,6 +154,7 @@ void wakeup_source_destroy(struct wakeup_source *ws)
return;
wakeup_source_drop(ws);
+ wakeup_source_record(ws);
kfree(ws->name);
kfree(ws);
}
@@ -930,6 +963,8 @@ 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;
}
--
2.2.0.rc0.207.ga3a616c
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
