From: Hugh Dickins <hugh@veritas.com>
To: Andrea Arcangeli <andrea@suse.de>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Rik van Riel <riel@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@osdl.org>, <torvalds@osdl.org>,
<linux-kernel@vger.kernel.org>
Subject: Re: anon_vma RFC2
Date: Fri, 12 Mar 2004 13:55:30 +0000 (GMT) [thread overview]
Message-ID: <Pine.LNX.4.44.0403121348070.4925-100000@localhost.localdomain> (raw)
In-Reply-To: <20040312132436.GT30940@dualathlon.random>
On Fri, 12 Mar 2004, Andrea Arcangeli wrote:
> On Fri, Mar 12, 2004 at 04:46:38AM -0800, William Lee Irwin III wrote:
> >
> > The case where mremap() creates rmap_chains is so rare I never ever saw
> > it happen in 6 months of regular practical use and testing. Their
> > creation could be triggered only by remap_file_pages().
>
> did you try specweb with apache? that's super heavy mremap as far as I
> know (and it maybe using anon memory, and if not I certainly cannot
> exclude other apps are using mremap on significant amounts of anymous
> ram).
anonmm has no problem with most mremaps: the special case is for
mremap MAYMOVE of anon vmas _inherited from parent_ (same page at
different addresses in the different mms). As I said before, it's
quite conceivable that this case never arises outside our testing
(but I'd be glad to be shown wrong, would make effort worthwhile).
Hugh
next prev parent reply other threads:[~2004-03-12 13:55 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-03-08 20:24 objrmap-core-1 (rmap removal for file mappings to avoid 4:4 in <=16G machines) Andrea Arcangeli
2004-03-08 20:39 ` Linus Torvalds
2004-03-08 21:23 ` Andrew Morton
2004-03-08 23:02 ` Andrea Arcangeli
2004-03-08 23:21 ` Andrew Morton
2004-03-08 23:40 ` Andrea Arcangeli
2004-03-09 0:10 ` Andrew Morton
2004-03-09 0:35 ` Andrea Arcangeli
2004-03-09 0:59 ` Andrew Morton
2004-03-09 8:31 ` Ingo Molnar
2004-03-09 8:44 ` William Lee Irwin III
2004-03-09 9:03 ` Ingo Molnar
2004-03-09 14:51 ` Andrea Arcangeli
2004-03-09 15:09 ` Ingo Molnar
2004-03-09 15:24 ` Andrea Arcangeli
2004-03-09 16:10 ` Ingo Molnar
2004-03-09 16:35 ` Andrea Arcangeli
2004-03-08 21:02 ` Andrew Morton
2004-03-08 22:34 ` Andrea Arcangeli
2004-03-09 2:46 ` Andrew Morton
2004-03-08 21:28 ` Arjan van de Ven
2004-03-08 23:08 ` Andrea Arcangeli
2004-03-09 7:47 ` Ingo Molnar
2004-03-09 15:21 ` Andrea Arcangeli
2004-03-09 15:36 ` Ingo Molnar
2004-03-09 16:33 ` Andrea Arcangeli
2004-03-09 17:23 ` Martin J. Bligh
2004-03-09 19:57 ` Ingo Molnar
2004-03-09 20:27 ` Andrea Arcangeli
2004-03-10 11:35 ` Ingo Molnar
2004-03-10 12:32 ` Andrea Arcangeli
2004-03-09 10:52 ` [lockup] " Ingo Molnar
2004-03-09 11:02 ` Ingo Molnar
2004-03-09 11:09 ` Andrew Morton
2004-03-09 11:49 ` Ingo Molnar
2004-03-09 12:32 ` William Lee Irwin III
2004-03-09 16:03 ` Andrea Arcangeli
2004-03-10 10:36 ` RFC anon_vma previous (i.e. full objrmap) Andrea Arcangeli
2004-03-10 10:40 ` RFC anon_vma preview " Andrea Arcangeli
2004-03-10 10:54 ` RFC anon_vma previous " Ingo Molnar
2004-03-11 6:52 ` anon_vma RFC2 Andrea Arcangeli
2004-03-11 13:23 ` Hugh Dickins
2004-03-11 13:56 ` Andrea Arcangeli
2004-03-11 21:54 ` Hugh Dickins
2004-03-12 1:47 ` Andrea Arcangeli
2004-03-12 2:20 ` Andrea Arcangeli
2004-03-12 3:28 ` Rik van Riel
2004-03-12 12:21 ` Andrea Arcangeli
2004-03-12 12:40 ` Rik van Riel
2004-03-12 13:11 ` Andrea Arcangeli
2004-03-12 16:25 ` Rik van Riel
2004-03-12 17:13 ` Andrea Arcangeli
2004-03-12 17:23 ` Rik van Riel
2004-03-12 17:44 ` Andrea Arcangeli
2004-03-12 18:18 ` Rik van Riel
2004-03-12 18:25 ` Linus Torvalds
2004-03-12 18:48 ` Rik van Riel
2004-03-12 19:02 ` Chris Friesen
2004-03-12 19:06 ` Rik van Riel
2004-03-12 19:10 ` Chris Friesen
2004-03-12 19:14 ` Rik van Riel
2004-03-12 20:27 ` Andrea Arcangeli
2004-03-12 20:32 ` Rik van Riel
2004-03-12 20:49 ` Andrea Arcangeli
2004-03-12 21:08 ` Jamie Lokier
2004-03-12 12:42 ` Andrea Arcangeli
2004-03-12 12:46 ` William Lee Irwin III
2004-03-12 13:24 ` Andrea Arcangeli
2004-03-12 13:40 ` William Lee Irwin III
2004-03-12 13:55 ` Hugh Dickins [this message]
2004-03-12 16:01 ` Andrea Arcangeli
2004-03-12 16:17 ` Linus Torvalds
2004-03-13 0:28 ` William Lee Irwin III
2004-03-13 14:43 ` Rik van Riel
2004-03-13 16:18 ` Linus Torvalds
2004-03-13 17:24 ` Hugh Dickins
2004-03-13 17:28 ` Rik van Riel
2004-03-13 17:41 ` Hugh Dickins
2004-03-13 18:08 ` Andrea Arcangeli
2004-03-13 17:54 ` Andrea Arcangeli
2004-03-13 17:55 ` Andrea Arcangeli
2004-03-13 18:57 ` Linus Torvalds
2004-03-13 19:14 ` Hugh Dickins
2004-03-13 17:48 ` Andrea Arcangeli
2004-03-13 17:33 ` Andrea Arcangeli
2004-03-13 17:53 ` Hugh Dickins
2004-03-13 18:13 ` Andrea Arcangeli
2004-03-13 19:35 ` Hugh Dickins
2004-03-13 17:57 ` Rik van Riel
2004-03-12 13:43 ` Hugh Dickins
2004-03-12 15:56 ` Andrea Arcangeli
2004-03-12 16:12 ` Hugh Dickins
2004-03-12 16:39 ` Andrea Arcangeli
2004-03-11 17:33 ` Andrea Arcangeli
2004-03-11 22:20 ` Rik van Riel
2004-03-11 23:43 ` Hugh Dickins
2004-03-12 3:20 ` Rik van Riel
2004-03-09 17:22 ` [lockup] Re: objrmap-core-1 (rmap removal for file mappings to avoid 4:4 in <=16G machines) Rik van Riel
2004-03-09 17:56 ` Andrea Arcangeli
2004-03-09 15:59 ` Andrea Arcangeli
2004-03-09 16:07 ` Ingo Molnar
2004-03-09 16:08 ` Ingo Molnar
2004-03-09 16:39 ` Andrea Arcangeli
2004-03-09 19:33 ` Ingo Molnar
2004-03-09 16:39 ` Andrea Arcangeli
2004-03-09 15:41 ` Andrea Arcangeli
2004-03-15 19:47 ` Marcelo Tosatti
2004-03-15 22:00 ` Andrea Arcangeli
2004-03-16 7:39 ` Marcelo Tosatti
2004-03-16 13:50 ` Andrea Arcangeli
2004-03-11 20:09 anon_vma RFC2 Manfred Spraul
[not found] <20040310080000.GA30940@dualathlon.random>
2004-03-10 13:01 ` [lockup] Re: objrmap-core-1 (rmap removal for file mappings to avoid 4:4 in <=16G machines) Rik van Riel
2004-03-10 13:50 ` Andrea Arcangeli
2004-03-12 17:05 ` anon_vma RFC2 Rajesh Venkatasubramanian
2004-03-12 17:26 ` Andrea Arcangeli
2004-03-12 21:16 ` Rajesh Venkatasubramanian
2004-03-13 17:55 ` Rajesh Venkatasubramanian
2004-03-13 18:16 ` Andrea Arcangeli
2004-03-13 19:40 ` Rajesh Venkatasubramanian
2004-03-14 0:23 ` Andrea Arcangeli
2004-03-14 0:52 ` Linus Torvalds
2004-03-14 1:01 ` William Lee Irwin III
2004-03-14 1:07 ` Rik van Riel
2004-03-14 1:19 ` William Lee Irwin III
2004-03-14 1:41 ` Rik van Riel
2004-03-14 2:27 ` William Lee Irwin III
2004-03-14 1:15 ` Linus Torvalds
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