linux-kernel - Re: [PATCH 44 of 66] skip transhuge pages in ksm for now

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Message-ID: <20101118160613.GZ8135@csn.ul.ie>
Date:	Thu, 18 Nov 2010 16:06:13 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 44 of 66] skip transhuge pages in ksm for now

On Wed, Nov 03, 2010 at 04:28:19PM +0100, Andrea Arcangeli wrote:
> From: Andrea Arcangeli <aarcange@...hat.com>
> 
> Skip transhuge pages in ksm for now.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> Reviewed-by: Rik van Riel <riel@...hat.com>

Acked-by: Mel Gorman <mel@....ul.ie>

This is an idle concern that I haven't looked into but is there any conflict
between khugepaged scanning the KSM scanning?

Specifically, I *think* the impact of this patch is that KSM will not
accidentally split a huge page. Is that right? If so, it could do with
being included in the changelog.

On the other hand, can khugepaged be prevented from promoting a hugepage
because of KSM?

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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