linux-kernel - Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon

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Message-ID: <4BBFC220.6060702@redhat.com>
Date:	Fri, 09 Apr 2010 20:11:12 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Borislav Petkov <bp@...en8.de>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	sgunderson@...foot.com
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas
 of a mergeable VMA

On 04/09/2010 08:03 PM, Linus Torvalds wrote:

> This is why I suggest that we limit the "re-use an existing vma for a new
> case" to the singleton case, which means that now you _never_ have
> differences at all. There's no spreading on splitting. Merging is trivial.

That looks like it should work.

> Now, admittedly, I'm really hopped up on cough medication, so the feeling
> of this solving all the problems in the universe may not be entirely
> accurate. But it feels so _right_.
>
> I hope if feels right when I'm off my meds too.

I am not on any cough meds, and your patch looks right.
OTOH, maybe I should be on some kind of cold meds, because
I haven't been feeling right all week...
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