linux-kernel - Re: [PATCH 01/11] mm,migration: Take a reference to the anon

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Message-ID: <alpine.DEB.2.00.1003171138070.27268@router.home>
Date:	Wed, 17 Mar 2010 11:38:54 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 01/11] mm,migration: Take a reference to the anon_vma
 before migrating

On Wed, 17 Mar 2010, Mel Gorman wrote:

> This is true, but I don't think such a change belongs in this patch
> series. If this series gets merged, then it would be sensible to investigate
> if refcounting anon_vma is a good idea or would it be a bouncing write-shared
> cacheline mess.

SLAB_DESTROY_BY_RCU is there to avoid the cooling of hot cachelines by
RCU.

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