linux-kernel - [PATCH 0/5] always lock the root anon

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Date:	Wed, 12 May 2010 13:38:15 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mel@....ul.ie>, Andrea Arcangeli <aarcange@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux-MM <linux-mm@...ck.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 0/5] always lock the root anon_vma

This patch series implements Linus's suggestion of always locking the
root anon_vma.  Because the lock in other anon_vmas no longer protects
anything at all, we cannot do the "lock dance" that Mel's earlier
patches implements and instead need a root pointer in the anon_vma.

The only subtlety these patches rely on is that the same_vma list
is ordered from new to old, with the root anon_vma at the very end.

This, together with the forward list walking in unlink_anon_vmas,
ensures that the root anon_vma is the last one freed.

The KSM refcount adds some additional complexity, because an anon_vma
can stick around after the processes it was attached to have already
exited.  Patch 5/5 deals with that issue.
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