linux-kernel - Re: [PATCH 03/10] ksm: define MADV_MERGEABLE and MADV

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Date:	Mon, 20 Jul 2009 11:09:21 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Izik Eidus <ieidus@...hat.com>
CC:	akpm@...ux-foundation.org, hugh.dickins@...cali.co.uk,
	aarcange@...hat.com, chrisw@...hat.com, avi@...hat.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	nickpiggin@...oo.com.au, Michael Kerrisk <mtk.manpages@...il.com>,
	Richard Henderson <rth@...ddle.net>,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Kyle McMartin <kyle@...artin.ca>, Helge Deller <deller@....de>,
	Chris Zankel <chris@...kel.net>
Subject: Re: [PATCH 03/10] ksm: define MADV_MERGEABLE and MADV_UNMERGEABLE

Izik Eidus wrote:
> From: Hugh Dickins <hugh.dickins@...cali.co.uk>
> 
> The out-of-tree KSM used ioctls on fds cloned from /dev/ksm to register
> a memory area for merging: we prefer now to use an madvise(2) interface.
> 
> This patch just defines MADV_MERGEABLE (to tell KSM it may merge pages
> in this area found identical to pages in other mergeable areas) and
> MADV_UNMERGEABLE (to undo that).
> 
> Most architectures use asm-generic, but alpha, mips, parisc, xtensa
> need their own definitions: included here for mmotm convenience, but
> we'll probably want to split this and feed pieces to arch maintainers.
> 
> Based upon earlier patches by Chris Wright and Izik Eidus.
> 
> Signed-off-by: Hugh Dickins <hugh.dickins@...cali.co.uk>
> Signed-off-by: Chris Wright <chrisw@...hat.com>
> Signed-off-by: Izik Eidus <ieidus@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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