linux-kernel - Re: [TuxOnIce-devel] [RFC] TuxOnIce

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Message-ID: <20090514091616.GB6417@elf.ucw.cz>
Date:	Thu, 14 May 2009 11:16:17 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	nigel@...onice.net, linux-pm@...ts.linux-foundation.org,
	tuxonice-devel@...ts.tuxonice.net, linux-kernel@...r.kernel.org
Subject: Re: [TuxOnIce-devel] [RFC] TuxOnIce

Hi!

> > > > And we have different ideas about how things should be done. Userspace
> > > > vs kernel space. Providing tuning knobs vs not. And so on.
> > > 
> > > This isn't _that_ important.  Actually, I'm not against an entirely in-kernel
> > > solution, as there are some clear benefits of doing it this way.  We only
> > > need to be careful enough not to break the existing setups.
> > 
> > Would you elaborate?
> 
> One benefit is that we need not anything in the initrd for hibernation to work.
> Another one is that we can get superior performance, for obvious reasons
> (less copying of data, faster I/O).   Yet another is simpler configuration and
> no need to maintain a separate set of user space tools.  I probably could
> find more.
>  
> > I would really hate to put progressbar painting into kernel; and if
> > that's in userspace, we can do compression/encryption there too as
> > well....
> 
> That's correct, we can.  But since we have LZO in the kernel now, we can use
> it for compression just as well, can't we?

Yes, but we do not have progressbar painting in the kernel -- yet --
so users will still need initrd etc.

Yes, we can move LZO into kernel pretty cheaply, and it will have
minor benefit of slightly faster reguler swsusp, but...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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