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

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Date:	Fri, 15 May 2015 18:25:41 -0700
From:	Jin Qian <jinqian@...roid.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
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

Hi Rafael,

I made a minor change in [PATCHv3 3/3] power: add a dummy
wakeup_source to record statistics. Sorry lkml seems down. I can send
you the link later.

The only diff is that deleted_ws.max_time = max(deleted_ws.max_time,
ws->max_time) instead of adding them up.

Thanks,
jin


On Fri, May 15, 2015 at 5:41 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> 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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