linux-kernel - Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

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Message-Id: <200707051523.44826.rjw@sisk.pl>
Date:	Thu, 5 Jul 2007 15:23:43 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	oliver@...kum.org, paulus@...ba.org, stern@...land.harvard.edu,
	johannes@...solutions.net, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, pavel@....cz, mjg59@...f.ucam.org,
	benh@...nel.crashing.org
Subject: Re: [linux-pm] Re: [PATCH] Remove process freezer from suspend to RAM pathway

On Thursday, 5 July 2007 13:54, Miklos Szeredi wrote:
> > > Limiting what a userspace filesystem can do would defeat the whole
> > > purpose of the bloody thing.  This is not negotiable ;)
> > 
> > Which doesn't change the fact that FUSE _is_ special, because it adds
> > dependencies between processed that were not present before.
> 
> OK, fuse is special.  So is the userspace driver framework (UIO)
> proposed by Greg KH and co.  Now what can be done about these?
> 
>  - making them not-special is not an option due to the established
>    interfaces, which don't allow restartability.
> 
>  - fixing the freezer is pretty much impossible because the
>    dependencies between the tasks cannot be known.
> 
>  - removing the freezer and fixing the drivers seems workable, we
>    already have a prototype in the form of the powermac architecture.
> 
> It seems pretty clear cut.  Whining about how much problems this will
> cause won't get us nearer to a solution.

Yes, that's pretty clear cut, but we should start from fixing the drivers. :-)

Greetings,
Rafael


-- 
"Premature optimization is the root of all evil." - Donald Knuth
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