linux-kernel - Re: [RFD] Automatic suspend

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Message-ID: <20090304004701.GB6280@elf.ucw.cz>
Date:	Wed, 4 Mar 2009 01:47:01 +0100
From:	Pavel Machek <pavel@....cz>
To:	Arve Hj?nnev?g <arve@...roid.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	"Woodruff, Richard" <r-woodruff2@...com>,
	Arjan van de Ven <arjan@...radead.org>,
	Kyle Moffett <kyle@...fetthome.net>,
	Oliver Neukum <oliver@...kum.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	mark gross <mgross@...ux.intel.com>,
	Uli Luckas <u.luckas@...d.de>,
	Igor Stoppa <igor.stoppa@...ia.com>,
	Brian Swetland <swetland@...gle.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFD] Automatic suspend

On Tue 2009-03-03 16:06:02, Arve Hj?nnev?g wrote:
> On Tue, Mar 3, 2009 at 5:51 AM, Pavel Machek <pavel@....cz> wrote:
> > Hi!
> >
> >> >> > Not ignoring, but considering them as insufficient.  And since they've already
> >> >> > been considered as insufficient, there's no point repeating them over and over
> >> >> > again.  That doesn't make them any better.
> >> >>
> >> >> The problem is that what you consider insufficient is what allows us
> >> >> to ship a product.
> >> >
> >> > This doesn't matter a whit, because the mainline kernel is not just your
> >> > product.
> >>
> >> Unless you are saying that changes in the mainline kernel does not
> >> need be usable in practice, then it does matter. If we remove the
> >> feature that allows us to interact with existing code, it will take
> >> much longer before it is usable by anyone.
> >
> > Well, taking longer before "being usable" is good tradeoff if it means
> > "we get cleaner/actually correct system in mainline sooner".
> 
> I think this could go either way. If the system is usable, it may get
> more use from developers that know how to improve a specific subsystem
> to not use timeouts. Or, it may be considered good enough, and nobody
> bothers coming up with a correct solution. I think the latter is what
> you are worried will happen.

Yep.

> >> I submitted them three weeks ago. I'll submit a new set after I rename
> >> the api (presumably to suspend_block(er)) but I would like more
> >> agreement on the timeout issue first.
> >
> > I do believe that everyone (including you :-) agrees that timeouts are
> > ugly hack. So just reorder the series so they come at the end.
> 
> No, I think many uses of timeouts are a ugly hack, not all, but OK I
> will try to move timeout support to a separate patch.

Thanks.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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