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Date: Wed, 9 Mar 2011 16:38:06 +0000
From: Mel Gorman <mel@csn.ul.ie>
Subject: Re: [PATCH 3/3] mm: Simplify anon_vma refcounts
Message-ID: <20110309163806.GE19206@csn.ul.ie>
References: <20110217161948.045410404@chello.nl> <20110217162124.457572646@chello.nl> <AANLkTimj1d6QpzuNZ6NJvLDVvvC++mPodggFaBziU8Bj@mail.gmail.com> <1298036683.5226.765.camel@laptop>
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To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Avi Kivity <avi@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, Rik van Riel <riel@redhat.com>, Ingo Molnar <mingo@elte.hu>, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Benjamin Herrenschmidt <benh@kernel.crashing.org>, David Miller <davem@davemloft.net>, Hugh Dickins <hugh.dickins@tiscali.co.uk>, Nick Piggin <npiggin@kernel.dk>, Paul McKenney <paulmck@linux.vnet.ibm.com>, Yanmin Zhang <yanmin_zhang@linux.intel.com>, Hugh Dickins <hughd@google.com>

On Fri, Feb 18, 2011 at 02:44:43PM +0100, Peter Zijlstra wrote:
> Subject: mm: Simplify anon_vma refcounts
> From: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Date: Fri, 26 Nov 2010 15:38:49 +0100
> 
> This patch changes the anon_vma refcount to be 0 when the object is
> free. It does this by adding 1 ref to being in use in the anon_vma
> structure (iow. the anon_vma->head list is not empty).
> 
> This allows a simpler release scheme without having to check both the
> refcount and the list as well as avoids taking a ref for each entry
> on the list.
> 
> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Acked-by: Hugh Dickins <hughd@google.com>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

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

-- 
Mel Gorman
SUSE Labs

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