linux-kernel - Re: [PATCH 0/7] ksm: responses to NUMA review

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Message-ID: <alpine.LNX.2.00.1302221227530.6100@eggly.anvils>
Date:	Fri, 22 Feb 2013 12:38:26 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Ric Mason <ric.masonn@...il.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Petr Holasek <pholasek@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Izik Eidus <izik.eidus@...ellosystems.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 0/7] ksm: responses to NUMA review

On Fri, 22 Feb 2013, Ric Mason wrote:
> On 02/21/2013 04:17 PM, Hugh Dickins wrote:
> > Here's a second KSM series, based on mmotm 2013-02-19-17-20: partly in
> > response to Mel's review feedback, partly fixes to issues that I found
> > myself in doing more review and testing.  None of the issues fixed are
> > truly show-stoppers, though I would prefer them fixed sooner than later.
> 
> Do you have any ideas ksm support page cache and tmpfs?

No.  It's only been asked as a hypothetical question: I don't know of
anyone actually needing it, and I wouldn't have time to do it myself.

It would be significantly more invasive than just dealing with anonymous
memory: with anon, we already have the infrastructure for read-only pages,
but we don't at present have any notion of read-only pagecache.

Just doing it in tmpfs?  Well, yes, that might be easier: since v3.1's
radix_tree rework, shmem/tmpfs mostly goes through its own interfaces
to pagecache, so read-only pagecache, and hence KSM, might be easier
to implement there than more generally.

Hugh
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