linux-ext4 - RE: [PATCH] xen: cleancache shim to Xen Transcendent Memory

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Date:	Fri, 15 Apr 2011 15:53:47 -0700 (PDT)
From:	Dan Magenheimer <dan.magenheimer@...cle.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Chris Mason <chris.mason@...cle.com>, viro@...iv.linux.org.uk,
	akpm@...ux-foundation.org, adilger.kernel@...ger.ca, tytso@....edu,
	mfasheh@...e.com, jlbec@...lplan.org, matthew@....cx,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	ocfs2-devel@....oracle.com, linux-mm@...ck.org, hch@...radead.org,
	ngupta@...are.org, jeremy@...p.org, JBeulich@...ell.com,
	Kurt Hackel <kurt.hackel@...cle.com>, npiggin@...nel.dk,
	Dave Mccracken <dave.mccracken@...cle.com>, riel@...hat.com,
	avi@...hat.com, Konrad Wilk <konrad.wilk@...cle.com>,
	mel@....ul.ie, yinghan@...gle.com, gthelen@...gle.com,
	torvalds@...ux-foundation.org
Subject: RE: [PATCH] xen: cleancache shim to Xen Transcendent Memory

> From: Ian Campbell [mailto:Ian.Campbell@...rix.com]
> Sent: Friday, April 15, 2011 4:02 PM
> Subject: Re: [PATCH] xen: cleancache shim to Xen Transcendent Memory
> 
> On Thu, 2011-04-14 at 14:20 -0700, Dan Magenheimer wrote:
> > [PATCH] xen: cleancache shim to Xen Transcendent Memory
> >
> > This patch provides a shim between the kernel-internal cleancache
> > API (see Documentation/mm/cleancache.txt) and the Xen Transcendent
> > Memory ABI (see http://oss.oracle.com/projects/tmem).
> 
> There's no need to build this into a kernel which doesn't have
> cleancache (or one of the other frontends), is there? I think there
> should be a Kconfig option (even if its not a user visible one) with
> the appropriate depends/selects.

Yes, you're right.  It should eventually depend on

CONFIG_CLEANCACHE || CONFIG_FRONTSWAP

though there's no sense merging this xen cleancache
shim at all unless/until Linus merges cleancache
(and hopefully later some evolution of frontswap).

And once cleancache (and/or frontswap) is merged,
there's very little reason NOT to enable one or
both on a Xen guest kernel.

Thanks,
Dan
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