linux-kernel - Re: [PATCH 19/21] mm: Convert i_mmap_lock and anon

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Date:	Mon, 29 Nov 2010 21:50:42 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Mel Gorman <mel@....ul.ie>, Nick Piggin <npiggin@...nel.dk>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH 19/21] mm: Convert i_mmap_lock and anon_vma->lock to
 mutexes

On Mon, 2010-11-29 at 12:05 +0900, KAMEZAWA Hiroyuki wrote:
> On Fri, 26 Nov 2010 15:39:02 +0100
> Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> 
> > Straight fwd conversion of i_mmap_lock and anon_vma->lock to mutexes.
> > 
> > Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> 
> No performance influence ?

I couldn't find any, if there was anything the error and per-boot
deviation was larger.

Yanmin also ran this though the intel test/performance farm and didn't
find anything significant.
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