From: Quinn Harris <quinn@nmt.edu>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: File copy system call proposal
Date: 08 Dec 2001 21:56:25 -0700 [thread overview]
Message-ID: <1007873785.354.0.camel@quinn.rcn.nmt.edu> (raw)
In-Reply-To: <9uuame$ssu$1@cesium.transmeta.com>
In-Reply-To: <1007782956.355.2.camel@quinn.rcn.nmt.edu> <9us387$poh$1@cesium.transmeta.com> <1007791439.355.7.camel@quinn.rcn.nmt.edu> <E16Chyk-0000zH-00@starship.berlin> <9uuame$ssu$1@cesium.transmeta.com>
On Sat, 2001-12-08 at 17:19, H. Peter Anvin wrote:
>
> One thing that one could do for an in-kernel copy is to extend
> sendfile() to support any kind of file descriptor. That'd be a very
> clean way to do it.
>
I think the best thing would be to extend generic_file_write
(mm/filemap.c) to recognize if its writing a complete page to disk in
which case it will not duplicate that page. (Issues with getting the
buffer cache to support this remain.) This should make either the
mmap/write or sendfile aproach be zero-copy. I am given the impression
that this is just what the TCP/IP version of write does to make it
zero-copy.
next prev parent reply other threads:[~2001-12-09 5:00 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1007833194.17577.0.camel@buffy>
2001-12-08 3:42 ` Quinn Harris
2001-12-08 4:00 ` H. Peter Anvin
2001-12-08 4:25 ` Christian Lavoie
2001-12-08 6:03 ` Quinn Harris
2001-12-08 13:57 ` Daniel Phillips
2001-12-09 0:19 ` H. Peter Anvin
2001-12-09 4:56 ` Quinn Harris [this message]
2001-12-10 5:44 ` Albert D. Cahalan
2001-12-09 20:25 ` Hans Reiser
2001-12-10 15:19 ` Daniel Phillips
2001-12-13 10:01 ` Andreas Dilger
2001-12-13 21:17 ` Pavel Machek
2001-12-19 20:26 ` Daniel Phillips
2001-12-20 10:09 ` Pavel Machek
2001-12-20 13:38 ` Svein Ove Aas
2001-12-20 13:53 ` Jakob Østergaard
2001-12-20 14:00 ` Jakob Østergaard
2001-12-23 1:19 ` Pavel Machek
2001-12-20 14:31 ` David Woodhouse
2001-12-20 15:06 ` George Greer
2001-12-20 15:07 ` David Woodhouse
2001-12-20 21:32 ` Jamie Lokier
2001-12-08 19:23 ` Quinn Harris
2001-12-08 23:11 ` Ton Hospel
2001-12-09 15:35 ` Pavel Machek
2001-12-10 11:50 ` Albert D. Cahalan
2001-12-10 2:49 ` Hans Reiser
2001-12-10 12:13 ` Pavel Machek
2001-12-10 15:20 ` vda
2001-12-10 18:44 Petr Vandrovec
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