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Date: Mon, 3 Dec 2012 13:59:34 +0000
From: Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH 1/2] mm/rmap: Convert the struct anon_vma::mutex to an
 rwsem
Message-ID: <20121203135934.GM8218@suse.de>
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To: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, linux-mm <linux-mm@kvack.org>, Peter Zijlstra <a.p.zijlstra@chello.nl>, Paul Turner <pjt@google.com>, Lee Schermerhorn <Lee.Schermerhorn@hp.com>, Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Andrea Arcangeli <aarcange@redhat.com>, Thomas Gleixner <tglx@linutronix.de>, Johannes Weiner <hannes@cmpxchg.org>, Hugh Dickins <hughd@google.com>

On Sat, Dec 01, 2012 at 09:10:30PM +0100, Ingo Molnar wrote:
> 
> Convert the struct anon_vma::mutex to an rwsem, which will help
> in solving a page-migration scalability problem. (Addressed in
> a separate patch.)
> 
> The conversion is simple and straightforward: in every case
> where we mutex_lock()ed we'll now down_write().
> 
> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Cc: Andrea Arcangeli <aarcange@redhat.com>
> Cc: Rik van Riel <riel@redhat.com>
> Cc: Mel Gorman <mgorman@suse.de>
> Cc: Hugh Dickins <hughd@google.com>
> Signed-off-by: Ingo Molnar <mingo@kernel.org>

Confirmation from the RT people that they're ok with this would be nice
but otherwise

Acked-by: Mel Gorman <mgorman@suse.de>

-- 
Mel Gorman
SUSE Labs

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