linux-kernel - Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.

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Message-ID: <20100528064356.GA2455@ucw.cz>
Date:	Fri, 28 May 2010 08:43:57 +0200
From:	Pavel Machek <pavel@....cz>
To:	Arve Hj?nnev?g <arve@...roid.com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Brian Swetland <swetland@...gle.com>,
	Alan Stern <stern@...land.harvard.edu>,
	mark gross <mgross@...ux.intel.com>, markgross@...gnar.org,
	Len Brown <len.brown@...el.com>, linux-doc@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.

Hi!

> >> >> How often would we retry suspending?
> >> >
> >> > Well based on some timer, the same way the screen blanks? Or five
> >> > seconds of no audio play? So if the suspend fails, then reset whatever
> >> > userspace suspend policy timers.
> >> >
> >> >> If we fail to suspend, don't we have to resume all the drivers that
> >> >> suspended before the one that failed?  (Maybe I'm mistaken here)
> >> >
> >> > Sure, but I guess that should be a rare event that only happens when
> >> > you try to suspend and something interrupts the suspend.
> >> >
> >>
> >> This is not a rare event. For example, the matrix keypad driver blocks
> >> suspend when a key is down so it can scan the matrix.
> >
> > Sure, but how many times per day are you suspending?
> 
> How many times we successfully suspend is irrelevant here. If the
> driver blocks suspend the number of suspend attempts depend on your
> poll frequency.

Actually, this is quite interesting question I'd like answer here:

"Sure, but how many times per day are you suspending?"

I suspect it may be in 1000s, but it would be cool to get better
answer -- so that people knew what we are talking about here.
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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