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

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Message-ID: <20100429130231.GA1661@ucw.cz>
Date:	Thu, 29 Apr 2010 15:02:31 +0200
From:	Pavel Machek <pavel@....cz>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	Avi Kivity <avi@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, jeremy@...p.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

Hi!

> > Stop right here. Instead of improving existing swap api, you just
> > create one because it is less work.
> > 
> > We do not want apis to cummulate; please just fix the existing one.
> 
> > If we added all the apis that worked when proposed, we'd have
> > unmaintanable mess by about 1996.
> > 
> > Why can't frontswap just use existing swap api?
> 
> Hi Pavel!
> 
> The existing swap API as it stands is inadequate for an efficient
> synchronous interface (e.g. for swapping to RAM).  Both Nitin
> and I independently have found this to be true.  But swap-to-RAM

So... how much slower is swapping to RAM over current interface when
compared to proposed interface, and how much is that slower than just
using the memory directly?
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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