linux-kernel - Re: Frontswap [PATCH 0/4] (was Transcendent Memory): overview

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Date:	Mon, 3 May 2010 21:32:23 +0200
From:	Pavel Machek <pavel@....cz>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	Avi Kivity <avi@...hat.com>, Jeremy Fitzhardinge <jeremy@...p.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	hugh.dickins@...cali.co.uk, ngupta@...are.org, JBeulich@...ell.com,
	chris.mason@...cle.com, kurt.hackel@...cle.com,
	dave.mccracken@...cle.com, npiggin@...e.de,
	akpm@...ux-foundation.org, riel@...hat.com
Subject: Re: Frontswap [PATCH 0/4] (was Transcendent Memory): overview


> > If block layer overhead is a problem, go ahead and optimize it instead
> > of adding new interfaces to bypass it.  Though I expect it wouldn't be
> > needed, and if any optimization needs to be done it is in the swap
> > layer.
> > Optimizing swap has the additional benefit of improving performance on
> > flash-backed swap.
> >  :
> > What happens when no tmem is available?  you swap to a volume.  That's
> > the disk size needed.
> >  :
> > You're dynamic swap is limited too.  And no, no guest modifications.
> 
> You keep saying you are going to implement all of the dynamic features
> of frontswap with no changes to the guest and no copying and no
> host-swapping.  You are being disingenuous.  VMware has had a lot

I don't see why no copying is a requirement. I believe requirement
should be "it is fast enough".
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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