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Date: Tue, 19 Apr 2011 13:07:25 -0700
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 15/20] mm: Convert i_mmap_lock to a mutex
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	<20110401121726.037173835@chello.nl>
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To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: 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>, Linus Torvalds <torvalds@linux-foundation.org>, linux-kernel@vger.kernel.org, linux-arch@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>, Mel Gorman <mel@csn.ul.ie>, 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, 01 Apr 2011 14:13:13 +0200
Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

> Straight fwd conversion of i_mmap_lock to a mutex

What effect does this have on kernel performance?

Workloads which take the lock at high frequency from multiple threads
should be tested.

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