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

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Message-Id: <1272643680.23895.2537.camel@nimitz>
Date:	Fri, 30 Apr 2010 09:08:00 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
Cc:	Avi Kivity <avi@...hat.com>, Pavel Machek <pavel@....cz>,
	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,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: RE: Frontswap [PATCH 0/4] (was Transcendent Memory): overview

On Fri, 2010-04-30 at 08:59 -0700, Dan Magenheimer wrote:
> Dave or others can correct me if I am wrong, but I think CMM2 also
> handles dirty pages that must be retained by the hypervisor.  The
> difference between CMM2 (for dirty pages) and frontswap is that
> CMM2 sets hints that can be handled asynchronously while frontswap
> provides explicit hooks that synchronously succeed/fail.

Once pages were dirtied (or I guess just slightly before), they became
volatile, and I don't think the hypervisor could do anything with them.
It could still swap them out like usual, but none of the CMM-specific
optimizations could be performed.

CC'ing Martin since he's the expert. :)

-- Dave

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