From: Rik van Riel <riel@redhat.com>
To: Minchan Kim <minchan.kim@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Mel Gorman <mel@csn.ul.ie>, Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Christoph Lameter <cl@linux.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH -v3] take all anon_vma locks in anon_vma_lock
Date: Thu, 29 Apr 2010 11:39:56 -0400 [thread overview]
Message-ID: <4BD9A84C.3050709@redhat.com> (raw)
In-Reply-To: <z2g28c262361004281955h29bc20edndb8da9c7cb5ff1db@mail.gmail.com>
On 04/28/2010 10:55 PM, Minchan Kim wrote:
> When you tried anon_vma_chain patches as I pointed out, what I have a
> concern is parent's vma not child's one.
> The vma of parent still has N anon_vma.
No, it is the other way around.
The anon_vma of the parent is also present in all of the
children, so the parent anon_vma is attached to N vmas.
However, the parent vma only has 1 anon_vma attached to
it, and each of the children will have 2 anon_vmas.
That is what should keep any locking overhead with this
patch minimal.
Yes, a deep fork bomb can slow itself down. Too bad,
don't do that :)
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next prev parent reply other threads:[~2010-04-29 15:40 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-27 21:30 [PATCH 0/3] Fix migration races in rmap_walk() V2 Mel Gorman
2010-04-27 21:30 ` [PATCH 1/3] mm,migration: During fork(), wait for migration to end if migration PTE is encountered Mel Gorman
2010-04-27 22:22 ` Andrea Arcangeli
2010-04-27 23:52 ` KAMEZAWA Hiroyuki
2010-04-28 0:18 ` Andrea Arcangeli
2010-04-28 0:19 ` Andrea Arcangeli
2010-04-28 0:28 ` KAMEZAWA Hiroyuki
2010-04-28 0:59 ` Andrea Arcangeli
2010-04-28 8:24 ` Mel Gorman
2010-04-27 21:30 ` [PATCH 2/3] mm,migration: Prevent rmap_walk_[anon|ksm] seeing the wrong VMA information Mel Gorman
2010-04-27 23:10 ` Andrea Arcangeli
2010-04-28 9:15 ` Mel Gorman
2010-04-28 15:35 ` Andrea Arcangeli
2010-04-28 15:39 ` Andrea Arcangeli
2010-04-28 15:55 ` Mel Gorman
2010-04-28 16:23 ` Andrea Arcangeli
2010-04-28 17:34 ` Mel Gorman
2010-04-28 17:58 ` Andrea Arcangeli
2010-04-28 17:47 ` [RFC PATCH] take all anon_vma locks in anon_vma_lock Rik van Riel
2010-04-28 18:03 ` Andrea Arcangeli
2010-04-28 18:09 ` Rik van Riel
2010-04-28 18:25 ` [RFC PATCH -v2] " Rik van Riel
2010-04-28 19:07 ` Mel Gorman
2010-04-28 20:17 ` [RFC PATCH -v3] " Rik van Riel
2010-04-28 20:57 ` Rik van Riel
2010-04-29 0:28 ` Minchan Kim
2010-04-29 2:10 ` Rik van Riel
2010-04-29 2:55 ` Minchan Kim
2010-04-29 6:42 ` Minchan Kim
2010-04-29 15:39 ` Rik van Riel [this message]
2010-04-29 7:37 ` Mel Gorman
2010-04-29 8:15 ` Mel Gorman
2010-04-29 8:32 ` Minchan Kim
2010-04-29 8:44 ` Mel Gorman
2010-04-27 21:30 ` [PATCH 3/3] mm,migration: Remove straggling migration PTEs when page tables are being moved after the VMA has already moved Mel Gorman
2010-04-27 22:30 ` Andrea Arcangeli
2010-04-27 22:58 ` Andrea Arcangeli
2010-04-28 0:39 ` KAMEZAWA Hiroyuki
2010-04-28 1:05 ` Andrea Arcangeli
2010-04-28 1:09 ` Andrea Arcangeli
2010-04-28 1:18 ` KAMEZAWA Hiroyuki
2010-04-28 1:36 ` Andrea Arcangeli
2010-04-28 1:29 ` KAMEZAWA Hiroyuki
2010-04-28 1:44 ` Andrea Arcangeli
2010-04-28 2:12 ` KAMEZAWA Hiroyuki
2010-04-28 2:42 ` Andrea Arcangeli
2010-04-28 2:49 ` KAMEZAWA Hiroyuki
2010-04-28 7:28 ` KAMEZAWA Hiroyuki
2010-04-28 10:48 ` Mel Gorman
2010-04-28 0:03 ` KAMEZAWA Hiroyuki
2010-04-28 0:08 ` Andrea Arcangeli
2010-04-28 0:36 ` KAMEZAWA Hiroyuki
2010-04-28 8:30 ` KAMEZAWA Hiroyuki
2010-04-28 14:46 ` Andrea Arcangeli
2010-04-27 22:27 ` [PATCH 0/3] Fix migration races in rmap_walk() V2 Christoph Lameter
2010-04-27 22:32 ` Andrea Arcangeli
2010-04-28 0:13 ` KAMEZAWA Hiroyuki
2010-04-28 0:20 ` Andrea Arcangeli
2010-04-28 14:23 ` Mel Gorman
2010-04-28 14:57 ` Mel Gorman
2010-04-28 15:16 ` Andrea Arcangeli
2010-04-28 15:23 ` Mel Gorman
2010-04-28 15:45 ` Andrea Arcangeli
2010-04-28 20:40 ` Andrea Arcangeli
2010-04-28 21:05 ` Andrea Arcangeli
2010-04-28 9:17 ` Mel Gorman
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