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Date: Sat, 01 Dec 2012 15:19:21 -0500
From: Rik van Riel <riel@redhat.com>
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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>, Mel Gorman <mgorman@suse.de>,
        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>
Subject: Re: [PATCH 1/2] mm/rmap: Convert the struct anon_vma::mutex to an
 rwsem
References: <1354305521-11583-1-git-send-email-mingo@kernel.org> <CA+55aFwjxm7OYuucHeE2WFr4p+jwr63t=kSdHndta_QkyFbyBQ@mail.gmail.com> <20121201094927.GA12366@gmail.com> <20121201122649.GA20322@gmail.com> <CA+55aFx8QtP0hg8qxn__4vHQuzH7QkhTN-4fwgOpM-A=KuBBjA@mail.gmail.com> <20121201184135.GA32449@gmail.com> <CA+55aFyq7OaUxcEHXvJhp0T57KN14o-RGxqPmA+ks8ge6zJh5w@mail.gmail.com> <20121201201030.GA2704@gmail.com>
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On 12/01/2012 03:10 PM, 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>

Reviewed-by: Rik van Riel <riel@redhat.com>


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