linux-kernel - Re: [PATCH 3/3] power: add a dummy wakeup

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Date:	Sat, 16 May 2015 02:41:56 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Jin Qian <jinqian@...roid.com>
Cc:	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] power: add a dummy wakeup_source to record statistics

On Wednesday, April 22, 2015 05:50:12 PM Jin Qian wrote:
> 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@...roid.com>

That's fine by me.  Queued up for 4.2, thanks!

> ---
>  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;
>  }
>  
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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