linux-kernel - Re: [PATCH 20/25] mm: Simplify anon

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Message-ID: <AANLkTikchW7Z6mSgcbt7wn9DWTeEGrKwfMwj1_WjMB5c@mail.gmail.com>
Date:	Wed, 26 Jan 2011 06:16:08 +1000
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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, 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>,
	Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 20/25] mm: Simplify anon_vma refcounts

On Wed, Jan 26, 2011 at 3:31 AM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>
> 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).

Why is this patch part of this series, rather than being an
independent patch before the whole series?

I think this part of the series is the only total no-brainer, ie we
should have done this from the beginning. The preemptability stuff I'm
more nervous about (performance issues? semantic differences?)

             Linus
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