linux-kernel - Re: [RFC][PATCH 5/8] PM / Sleep: Change wakeup statistics

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Date:	Wed, 15 Feb 2012 23:37:21 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	Linux PM list <linux-pm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Magnus Damm <magnus.damm@...il.com>, markgross@...gnar.org,
	Matthew Garrett <mjg@...hat.com>,
	Greg KH <greg@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Brian Swetland <swetland@...gle.com>,
	Neil Brown <neilb@...e.de>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [RFC][PATCH 5/8] PM / Sleep: Change wakeup statistics

On Wednesday, February 15, 2012, Arve Hjønnevåg wrote:
> On Mon, Feb 6, 2012 at 5:05 PM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> >
> > Wakeup statistics used by Android are slightly different from what we
> > have at the moment, so modify them to follow Android more closely.
> ...
> > @@ -438,6 +444,11 @@ static void wakeup_source_deactivate(str
> >        if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
> >                ws->max_time = duration;
> >
> > +       ws->last_time = now;
> > +       if (ws->has_timeout && time_after(jiffies, ws->timer_expires))
> 
> time_after_eq may work better (or increment the count from the timer).

I think incrementing the count from the timer is a better approach.

> I applied this patch and the expire counts I see for wakeup-sources
> that always time-out do not match the active count.

I see.  The reason may also be that __pm_wakeup_event() increments
ws->event_count even if the wakeup source is already active.

Thanks,
Rafael
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