From: Matt Mackall <mpm@selenic.com>
To: dhowells@redhat.com
Cc: torvalds@osdl.org, akpm@osdl.org, davidm@snapgear.com,
linux-kernel@vger.kernel.org, uclinux-dev@uclinux.org
Subject: Re: [PATCH 17/20] FRV: Better mmap support in uClinux
Date: Thu, 18 Nov 2004 21:29:36 -0800 [thread overview]
Message-ID: <20041119052936.GE8040@waste.org> (raw)
In-Reply-To: <200411081434.iA8EYKn7023613@warthog.cambridge.redhat.com>
On Mon, Nov 08, 2004 at 02:34:20PM +0000, dhowells@redhat.com wrote:
> (3) Files (and blockdevs) cannot be mapped shared since it is not
> really possible to honour this by writing any changes back to the
> backing device.
[way behind on email]
I think this could be done at msync, munmap and exit time? You end up
flushing the entire mapping, but it's still correct (and POSIX
compliant).
And, if you wanted to be really clever, you could store a hash of each
page to detect changes and avoid the extra I/O.
--
Mathematics is the supreme nostalgia of our time.
next prev parent reply other threads:[~2004-11-19 5:30 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <76b4a884-2c3c-11d9-91a1-0002b3163499@redhat.com>
2004-11-01 19:30 ` [PATCH 4/14] FRV: Bitops fixes dhowells
2004-11-02 8:19 ` Andrew Morton
2004-11-01 19:30 ` [PATCH 3/14] FRV: Fujitsu FR-V arch documentation dhowells
2004-11-01 19:30 ` [PATCH 5/14] FRV: Fork fixes dhowells
2004-11-01 19:30 ` [PATCH 8/14] FRV: GP-REL data support dhowells
2004-11-02 8:18 ` Andrew Morton
2004-11-02 9:48 ` Christoph Hellwig
2004-11-02 16:34 ` David Howells
2004-11-03 10:42 ` Christoph Hellwig
2004-11-01 19:30 ` [PATCH 11/14] FRV: Add FDPIC ELF binary format driver dhowells
2004-11-02 8:18 ` Andrew Morton
2004-11-02 11:07 ` Andrew Morton
2004-11-02 16:47 ` David Howells
2004-11-02 17:23 ` Andi Kleen
2004-11-01 19:30 ` [PATCH 10/14] FRV: Make calibrate_delay() optional dhowells
2004-11-02 0:06 ` john stultz
2004-11-02 8:17 ` Andrew Morton
2004-11-02 9:36 ` Christoph Hellwig
2004-11-02 11:01 ` David Howells
2004-11-02 16:29 ` David Howells
2004-11-03 10:40 ` Christoph Hellwig
2004-11-01 19:30 ` [PATCH 9/14] FRV: CONFIG_MMU fixes dhowells
2004-11-02 9:43 ` Christoph Hellwig
2004-11-03 15:06 ` David Howells
2004-11-03 15:13 ` Christoph Hellwig
2004-11-03 15:30 ` David Howells
2004-11-01 19:30 ` [PATCH 7/14] FRV: GDB stub dependent additional BUG()'s dhowells
2004-11-02 9:34 ` Christoph Hellwig
2004-11-02 16:09 ` David Howells
2004-11-03 10:39 ` Christoph Hellwig
2004-11-03 13:41 ` David Howells
2004-11-01 19:30 ` [PATCH 6/14] FRV: IDE fixes dhowells
2004-11-01 22:53 ` Alan Cox
2004-11-02 0:13 ` Bartlomiej Zolnierkiewicz
2004-11-02 10:57 ` David Howells
2004-11-01 19:30 ` [PATCH 13/14] FRV: Convert extern inline -> static inline dhowells
2004-11-01 19:30 ` [PATCH 12/14] FRV: Generate more useful debug info dhowells
2004-11-02 0:29 ` Andrew Morton
2004-11-02 11:21 ` David Howells
2004-11-03 1:48 ` Linus Torvalds
2004-11-03 1:52 ` Linus Torvalds
2004-11-03 20:40 ` Florian Weimer
2004-11-03 20:42 ` Linus Torvalds
2004-11-03 13:38 ` David Howells
2004-11-03 15:32 ` Linus Torvalds
2004-11-12 14:57 ` Daniel Jacobowitz
2004-11-12 15:15 ` David Howells
2004-11-12 15:20 ` Daniel Jacobowitz
[not found] ` <20040401020550.GG3150@beast>
2004-11-01 19:30 ` [PATCH 14/14] FRV: Better mmap support in uClinux dhowells
2004-11-02 9:54 ` Christoph Hellwig
2004-11-02 16:43 ` David Howells
2004-11-03 10:45 ` Christoph Hellwig
2004-11-08 14:34 ` [PATCH 17/20] " dhowells
2004-11-09 12:57 ` Christoph Hellwig
2004-11-09 13:55 ` David Howells
2004-11-09 14:02 ` Christoph Hellwig
2004-11-19 5:29 ` Matt Mackall [this message]
2004-11-19 16:26 ` David Howells
2004-11-19 16:56 ` Matt Mackall
2004-11-19 17:06 ` David Howells
2004-11-19 17:42 ` Linus Torvalds
2004-11-02 0:21 ` [PATCH 1/14] FRV: Fujitsu FR-V CPU arch implementation Andrew Morton
2004-11-02 23:46 ` [uClinux-dev] " Christoph Hellwig
[not found] ` <200411011930.iA1JUKFH023161@warthog.cambridge.redhat.com>
2004-11-02 23:24 ` [uClinux-dev] [PATCH 2/14] FRV: Fujitsu FR-V arch include files Christoph Hellwig
2004-11-03 17:26 ` David Howells
2004-11-03 19:46 ` [uClinux-dev] [PATCH 1/14] FRV: Fujitsu FR-V CPU arch implementation David Howells
2004-11-03 20:32 ` Christoph Hellwig
2004-11-04 11:54 ` David Howells
2004-11-08 14:34 [PATCH 1/20] FRV: Fujitsu FR-V CPU arch maintainer record dhowells
2004-11-08 14:34 ` [PATCH 2/20] FRV: Fujitsu FR-V arch documentation dhowells
2004-11-08 14:34 ` [PATCH 6/20] FRV: Fujitsu FR-V CPU arch implementation part 4 dhowells
2004-11-08 14:34 ` [PATCH 4/20] FRV: Fujitsu FR-V CPU arch implementation part 2 dhowells
2004-11-08 14:34 ` [PATCH 5/20] FRV: Fujitsu FR-V CPU arch implementation part 3 dhowells
2004-11-08 14:34 ` [PATCH 7/20] FRV: Fujitsu FR-V CPU arch implementation part 5 dhowells
2004-11-09 15:09 ` Geert Uytterhoeven
2004-11-08 14:34 ` [PATCH 3/20] FRV: Fujitsu FR-V CPU arch implementation part 1 dhowells
2004-11-08 14:34 ` [PATCH 8/20] FRV: Fujitsu FR-V CPU arch implementation part 6 dhowells
2004-11-08 14:34 ` [PATCH 9/20] FRV: Fujitsu FR-V CPU arch implementation part 7 dhowells
2004-11-08 14:34 ` [PATCH 11/20] FRV: Fujitsu FR-V CPU arch implementation part 9 dhowells
2004-11-08 14:34 ` [PATCH 10/20] FRV: Fujitsu FR-V CPU arch implementation part 8 dhowells
2004-11-08 14:34 ` [PATCH 15/20] FRV: Fujitsu FR-V arch include files dhowells
2004-11-08 14:34 ` [PATCH 16/20] FRV: Make calibrate_delay() optional dhowells
2004-11-08 14:34 ` [PATCH 14/20] FRV: Fujitsu FR-V arch include files dhowells
2004-11-08 14:34 ` [PATCH 13/20] " dhowells
2004-11-08 14:34 ` [PATCH 18/20] FRV: procfs changes for nommu changes dhowells
2004-11-08 14:34 ` [PATCH 20/20] FRV: Add FDPIC ELF binary format driver dhowells
2004-11-08 14:34 ` [PATCH 19/20] FRV: change setup_arg_pages() to take stack pointer dhowells
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