From: Larry McVoy <lm@bitmover.com>
To: Linus Torvalds <torvalds@osdl.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>,
Wayne Scott <wscott@bitmover.com>,
akpm@osdl.org, elenstev@mesatop.com, lm@bitmover.com,
wli@holomorphy.com, hugh@veritas.com, adi@bitmover.com,
scole@lanl.gov, support@bitmover.com,
linux-kernel@vger.kernel.org
Subject: Re: 1352 NUL bytes at the end of a page?
Date: Mon, 17 May 2004 08:25:17 -0700 [thread overview]
Message-ID: <20040517152517.GD30695@work.bitmover.com> (raw)
In-Reply-To: <Pine.LNX.4.58.0405170820560.25502@ppc970.osdl.org>
On Mon, May 17, 2004 at 08:22:10AM -0700, Linus Torvalds wrote:
> On Mon, 17 May 2004, Theodore Ts'o wrote:
> > Note though that the stdio library uses a writeable mmap to implement
> > fwrite.
>
> It does? Whee. Then I'll have to agree with Andrew - if there is a path
> that is more likely to have bugs, it's trying to do writes with mmap and
> ftruncate.
>
> Who came up with that braindead idea? Is it some crazed Mach developer
> that infiltrated the glibc development group?
You have my agreement on the craziness of this idea. It's a lot easier for
the kernel to do smart things with write behind with write() rather than
mmap()-ed pages being touched. SunOS is the only system I know which does
both "correctly" (correctly meaning the same way whether it is mmap or
write).
It's also a lose to do mmap() instead of read/write for small files. Linux
is light weight enough that the cross over point is pretty small, probably
under 8K and certainly under 16K, but still.
--
---
Larry McVoy lm at bitmover.com http://www.bitkeeper.com
next prev parent reply other threads:[~2004-05-17 15:28 UTC|newest]
Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <6616858C-A5AF-11D8-A7EA-000A95CC3A8A@lanl.gov>
[not found] ` <200405122234.06902.elenstev@mesatop.com>
[not found] ` <15594C37-A509-11D8-A7EA-000A95CC3A8A@lanl.gov>
[not found] ` <20040513183316.GE17965@bitmover.com>
2004-05-14 4:32 ` 1352 NUL bytes at the end of a page? Steven Cole
[not found] ` <20040514144617.GE20197@work.bitmover.com>
[not found] ` <200405131723.15752.elenstev@mesatop.com>
2004-05-14 16:53 ` 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.) Andy Isaacson
2004-05-14 17:23 ` Steven Cole
2004-05-15 0:54 ` Steven Cole
2004-05-15 1:55 ` 1352 NUL bytes at the end of a page? Wayne Scott
2004-05-15 3:15 ` 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.) Lincoln Dale
2004-05-15 3:41 ` Andrew Morton
2004-05-15 5:39 ` Steven Cole
2004-05-16 1:23 ` Steven Cole
2004-05-16 2:18 ` Linus Torvalds
2004-05-16 3:44 ` Linus Torvalds
2004-05-16 4:31 ` Steven Cole
2004-05-16 4:52 ` Linus Torvalds
2004-05-16 5:22 ` Andrea Arcangeli
2004-05-16 15:28 ` Steven Cole
2004-05-16 17:49 ` Rutger Nijlunsing
2004-05-16 20:38 ` Andrea Arcangeli
2004-05-16 21:19 ` Steven Cole
2004-05-16 21:29 ` Andrew Morton
2004-05-16 22:11 ` Steven Cole
2004-05-16 23:53 ` Andrea Arcangeli
2004-05-17 2:12 ` Steven Cole
2004-05-17 8:21 ` R. J. Wysocki
2004-05-16 5:54 ` Steven Cole
2004-05-16 6:09 ` Andrew Morton
2004-05-16 6:24 ` Andrew Morton
2004-05-16 10:01 ` Andrew Morton
2004-05-16 13:49 ` Steven Cole
2004-05-18 1:47 ` Benjamin Herrenschmidt
2004-05-16 3:20 ` Andrew Morton
2004-05-16 3:58 ` Linus Torvalds
2004-05-17 2:28 ` Larry McVoy
2004-05-17 2:42 ` Linus Torvalds
2004-05-17 3:36 ` Steven Cole
2004-05-17 5:17 ` Linus Torvalds
2004-05-17 6:11 ` Andrew Morton
2004-05-17 13:56 ` 1352 NUL bytes at the end of a page? Wayne Scott
2004-05-17 15:17 ` Theodore Ts'o
2004-05-17 15:20 ` Larry McVoy
2004-05-17 15:22 ` Linus Torvalds
2004-05-17 15:25 ` Larry McVoy [this message]
2004-05-17 15:37 ` viro
2004-05-17 17:30 ` Steven Cole
2004-05-17 17:40 ` viro
2004-05-17 17:39 ` Steven Cole
2004-05-17 19:06 ` viro
2004-05-17 15:40 ` Arjan van de Ven
2004-05-17 15:53 ` Steven Cole
2004-05-17 16:23 ` Davide Libenzi
2004-05-17 16:28 ` Davide Libenzi
2004-05-17 14:07 ` 1352 NUL bytes at the end of a page? (was Re: Assertion `s && s->tree' failed: The saga continues.) Larry McVoy
2004-05-17 14:12 ` Linus Torvalds
2004-05-17 7:25 ` Andrew Morton
2004-05-17 7:46 ` Andrew Morton
2004-05-17 8:39 ` Vladimir Saveliev
2004-05-17 8:44 ` Andrew Morton
2004-05-17 11:58 ` Steven Cole
2004-05-17 14:05 ` Larry McVoy
2004-05-17 14:14 ` Larry McVoy
2004-05-17 14:32 ` Linus Torvalds
2004-05-17 14:52 ` Larry McVoy
2004-05-17 15:02 ` Linus Torvalds
2004-05-17 15:05 ` Larry McVoy
2004-05-17 15:23 ` Chris Mason
2004-05-17 15:49 ` Steven Cole
2004-05-17 20:24 ` Chris Mason
2004-05-17 21:08 ` Steven Cole
2004-05-17 21:29 ` Andrew Morton
2004-05-17 22:15 ` Steven Cole
2004-05-17 23:52 ` Steven Cole
2004-05-18 0:03 ` Chris Mason
2004-05-18 0:15 ` Andrew Morton
2004-05-18 0:13 ` Andrew Morton
2004-05-18 0:45 ` Steven Cole
2004-05-18 1:34 ` Larry McVoy
2004-05-18 1:42 ` Andrew Morton
2004-05-18 1:56 ` Steven Cole
2004-05-17 14:11 ` Larry McVoy
[not found] ` <200405172142.52780.elenstev@mesatop.com>
[not found] ` <Pine.LNX.4.58.0405172056480.25502@ppc970.osdl.org>
[not found] ` <200405172319.38853.elenstev@mesatop.com>
2004-05-18 12:42 ` Chris Mason
2004-05-18 14:29 ` Steven Cole
2004-05-18 14:38 ` Linus Torvalds
2004-05-19 10:53 ` Steven Cole
2004-05-19 12:10 ` Chris Mason
2004-05-19 12:20 ` 1352 NUL bytes at the end of a page? Wayne Scott
2004-05-19 12:42 ` Nick Piggin
2004-05-19 13:28 ` Steven Cole
2004-05-19 13:36 ` Chris Mason
2004-05-19 13:59 ` Steven Cole
2004-05-19 14:03 ` Wayne Scott
2004-05-19 14:08 ` Chris Mason
2004-05-19 14:20 ` Steven Cole
2004-05-19 14:45 ` Steven Cole
2004-05-19 21:11 ` Non-regression for current kernel (was Re: 1352 NUL bytes at the end of a page?) Steven Cole
2004-05-13 19:08 1352 NUL bytes at the end of a page? Andy Isaacson
2004-05-14 2:22 ` Andrew Morton
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