From: Bill Irwin <bill.irwin@oracle.com>
To: Nick Piggin <npiggin@suse.de>
Cc: Ingo Molnar <mingo@elte.hu>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management <linux-mm@kvack.org>,
Linux Kernel <linux-kernel@vger.kernel.org>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Subject: Re: [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear)
Date: Wed, 7 Mar 2007 01:44:20 -0800 [thread overview]
Message-ID: <20070307094420.GL18774@holomorphy.com> (raw)
In-Reply-To: <20070307092821.GB8609@wotan.suse.de>
On Wed, Mar 07, 2007 at 10:28:21AM +0100, Nick Piggin wrote:
> Depending on whether anyone wants it, and what features they want, we
> could emulate the old syscall, and make a new restricted one which is
> much less intrusive.
> For example, if we can operate only on MAP_ANONYMOUS memory and specify
> that nonlinear mappings effectively mlock the pages, then we can get
> rid of all the objrmap and unmap_mapping_range handling, forget about
> the writeout and msync problems...
Anonymous-only would make it a doorstop for Oracle, since its entire
motive for using it is to window into objects larger than user virtual
address spaces (this likely also applies to UML, though they should
really chime in to confirm). Restrictions to tmpfs and/or ramfs would
likely be liveable, though I suspect some things might want to do it to
shm segments (I'll ask about that one). There's definitely no need for a
persistent backing store for the object to be remapped in Oracle's case,
in any event. It's largely the in-core destination and source of IO, not
something saved on-disk itself.
-- wli
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next prev parent reply other threads:[~2007-03-07 9:44 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-21 4:49 [patch 0/6] fault vs truncate/invalidate race fix Nick Piggin
2007-02-21 4:49 ` [patch 1/6] mm: debug check for the fault vs invalidate race Nick Piggin
2007-02-21 4:49 ` [patch 2/6] mm: simplify filemap_nopage Nick Piggin
2007-02-21 4:50 ` [patch 3/6] mm: fix fault vs invalidate race for linear mappings Nick Piggin
2007-03-07 6:36 ` Andrew Morton
2007-03-07 6:57 ` Nick Piggin
2007-03-07 7:08 ` Andrew Morton
2007-03-07 7:25 ` Nick Piggin
2007-02-21 4:50 ` [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear) Nick Piggin
2007-03-07 6:51 ` Andrew Morton
2007-03-07 7:08 ` Nick Piggin
2007-03-07 8:19 ` Nick Piggin
2007-03-07 8:27 ` Ingo Molnar
2007-03-07 8:35 ` Andrew Morton
2007-03-07 8:53 ` Ingo Molnar
2007-03-07 9:28 ` Nick Piggin
2007-03-07 9:44 ` Bill Irwin [this message]
2007-03-07 9:49 ` Nick Piggin
2007-03-07 10:02 ` Nick Piggin
2007-03-12 23:01 ` Blaisorblade
2007-03-13 1:19 ` Nick Piggin
2007-03-17 12:17 ` Blaisorblade
2007-03-18 2:50 ` Nick Piggin
2007-03-18 13:09 ` Jeff Dike
2007-03-19 12:04 ` Bill Irwin
2007-03-19 20:44 ` Blaisorblade
2007-03-20 6:00 ` Nick Piggin
2007-03-21 19:45 ` Blaisorblade
2007-03-08 12:39 ` Blaisorblade
2007-03-07 9:29 ` Bill Irwin
2007-03-07 9:39 ` Andrew Morton
2007-03-07 10:09 ` Bill Irwin
2007-03-07 8:38 ` Miklos Szeredi
2007-03-07 8:47 ` Andrew Morton
2007-03-07 8:51 ` Miklos Szeredi
2007-03-07 9:07 ` Andrew Morton
2007-03-07 9:18 ` Nick Piggin
2007-03-07 9:26 ` Andrew Morton
2007-03-07 9:28 ` Miklos Szeredi
2007-03-07 9:38 ` Nick Piggin
2007-03-07 9:25 ` Miklos Szeredi
2007-03-07 9:32 ` Peter Zijlstra
2007-03-07 9:45 ` Nick Piggin
2007-03-07 10:04 ` Nick Piggin
2007-03-07 10:06 ` Peter Zijlstra
2007-03-07 10:13 ` Miklos Szeredi
2007-03-07 10:21 ` Nick Piggin
2007-03-07 10:24 ` Peter Zijlstra
2007-03-07 10:38 ` Nick Piggin
2007-03-07 10:47 ` Peter Zijlstra
2007-03-07 11:00 ` Nick Piggin
2007-03-07 11:48 ` Peter Zijlstra
2007-03-07 12:17 ` Nick Piggin
2007-03-07 12:41 ` Peter Zijlstra
2007-03-07 13:08 ` Nick Piggin
2007-03-07 13:19 ` Peter Zijlstra
2007-03-07 13:36 ` Nick Piggin
2007-03-07 13:52 ` Peter Zijlstra
2007-03-07 13:56 ` Miklos Szeredi
2007-03-07 14:34 ` Peter Zijlstra
2007-03-07 15:01 ` Nick Piggin
2007-03-07 16:58 ` [RFC][PATCH] mm: fix page_mkclean() vs non-linear vmas Peter Zijlstra
2007-03-07 18:00 ` Linus Torvalds
2007-03-07 18:12 ` Peter Zijlstra
2007-03-07 18:24 ` Peter Zijlstra
2007-03-08 11:21 ` Miklos Szeredi
2007-03-08 11:37 ` Peter Zijlstra
2007-03-08 11:48 ` Miklos Szeredi
2007-03-08 12:11 ` Peter Zijlstra
2007-03-08 12:19 ` Nick Piggin
2007-03-08 12:25 ` Miklos Szeredi
2007-03-08 11:58 ` Nick Piggin
2007-03-08 12:09 ` Miklos Szeredi
2007-03-07 15:10 ` [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear) Jeff Dike
2007-03-07 13:53 ` Miklos Szeredi
2007-03-07 14:50 ` Nick Piggin
2007-03-07 12:22 ` Bill Irwin
2007-03-07 12:36 ` Nick Piggin
2007-03-07 10:30 ` [rfc][patch 7/6] mm: merge page_mkwrite Nick Piggin
2007-03-07 8:59 ` [patch 4/6] mm: merge populate and nopage into fault (fixes nonlinear) Nick Piggin
2007-03-07 9:11 ` Nick Piggin
2007-03-07 9:22 ` Ingo Molnar
2007-03-07 9:32 ` Bill Irwin
2007-03-07 9:35 ` Ingo Molnar
2007-03-07 9:50 ` Bill Irwin
2007-03-07 9:52 ` Nick Piggin
2007-03-07 7:19 ` Bill Irwin
2007-03-07 10:05 ` Benjamin Herrenschmidt
2007-03-07 10:17 ` Nick Piggin
2007-03-07 10:46 ` Benjamin Herrenschmidt
2007-02-21 4:50 ` [patch 5/6] mm: merge nopfn into fault Nick Piggin
2007-02-21 5:13 ` Nick Piggin
2007-02-21 4:50 ` [patch 6/6] mm: remove legacy cruft Nick Piggin
2007-02-27 4:36 ` [patch 0/6] fault vs truncate/invalidate race fix Dave Airlie
2007-02-27 5:32 ` Andrew Morton
2007-02-27 6:26 ` Dave Airlie
2007-02-27 6:54 ` Benjamin Herrenschmidt
2007-03-18 23:13 ` Dave Airlie
2007-02-27 8:50 ` Nick Piggin
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