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

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Message-ID: <20100318111231.GJ12388@csn.ul.ie>
Date:	Thu, 18 Mar 2010 11:12:32 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
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, Mar 17, 2010 at 11:38:54AM -0500, Christoph Lameter wrote:
> 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.
> 

Then even if we move to a full ref-count, it might still be a good idea
to preserve the SLAB_DESTROY_BY_RCU.

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