linux-kernel - Re: [GIT PULL] mm: frontswap (for 3.2 window)

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Message-ID: <CAOzbF4fnD=CGR-nizZoBxmFSuAjFC3uAHf3wDj5RLneJvJhrOQ@mail.gmail.com>
Date:	Fri, 28 Oct 2011 00:30:10 -0700
From:	Cyclonus J <cyclonusj@...il.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	David Rientjes <rientjes@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>, ngupta@...are.org,
	Chris Mason <chris.mason@...cle.com>, JBeulich@...ell.com,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [GIT PULL] mm: frontswap (for 3.2 window)

On Fri, Oct 28, 2011 at 12:12 AM, Sasha Levin <levinsasha928@...il.com> wrote:
> On Thu, 2011-10-27 at 17:52 -0400, Christoph Hellwig wrote:
>> On Thu, Oct 27, 2011 at 02:49:31PM -0700, Dan Magenheimer wrote:
>> > If Linux truly subscribes to the "code rules" mantra, no core
>> > VM developer has proposed anything -- even a design, let alone
>> > working code -- that comes close to providing the functionality
>> > and flexibility that frontswap (and cleancache) provides, and
>> > frontswap provides it with a very VERY small impact on existing
>> > kernel code AND has been posted and working for 2+ years.
>> > (And during that 2+ years, excellent feedback has improved the
>> > "kernel-ness" of the code, but NONE of the core frontswap
>> > design/hooks have changed... because frontswap _just works_!)
>>
>> It might work for whatever defintion of work, but you certainly couldn't
>> convince anyone that matters that it's actually sexy and we'd actually
>> need it.  Only actually working on Xen of course doesn't help.
>
> Theres a working POC of it on KVM, mostly based on reusing in-kernel Xen
> code.
>
> I felt it would be difficult to try and merge any tmem KVM patches until
> both frontswap and cleancache are in the kernel, thats why the
> development is currently paused at the POC level.

Same here. I am working a KVM support for Transcedent Memory as well.
It would be nice to see this in the mainline.

Thanks,
CJ

>
> --
>
> Sasha.
>
>
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