From: torvalds@transmeta.com (Linus Torvalds)
To: linux-kernel@vger.kernel.org
Subject: Re: File System Performance
Date: Mon, 12 Nov 2001 21:48:28 +0000 (UTC) [thread overview]
Message-ID: <9spg3c$7bb$1@penguin.transmeta.com> (raw)
In-Reply-To: <3BF03402.87D44589@zip.com.au> <3BF03402.87D44589@zip.com.au> <1005600431.13303.10.camel@jen.americas.sgi.com> <3BF04289.8FC8B7B7@zip.com.au>
In article <3BF04289.8FC8B7B7@zip.com.au>,
Andrew Morton <akpm@zip.com.au> wrote:
>
>It's tar. It cheats. It somehow detects that the
>output is /dev/null, and so it doesn't read the input files.
Probably the kernel.
If you do a mmap()+write(), the write() to /dev/null won't even read the
mmap contents, which in turn will cause the pages to never be brought
in.
Anything which uses mmap+write will show this.
Linus
next prev parent reply other threads:[~2001-11-12 21:53 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-12 13:54 File System Performance Ben Israel
2001-11-12 16:33 ` Andrew Morton
2001-11-12 17:50 ` Ben Israel
2001-11-12 19:46 ` Andrew Morton
2001-11-12 19:59 ` Richard Gooch
2001-11-12 23:07 ` Mike Fedyk
2001-11-13 0:04 ` Richard Gooch
2001-11-13 0:08 ` Mike Fedyk
2001-11-13 0:26 ` Richard Gooch
2001-11-13 0:47 ` Mike Castle
2001-11-13 1:28 ` Mike Fedyk
2001-11-13 6:34 ` Richard Gooch
2001-11-13 20:56 ` Andreas Dilger
2001-11-13 7:45 ` Andreas Dilger
2001-11-12 20:06 ` Steve Lord
2001-11-12 20:41 ` Andrew Morton
2001-11-12 21:27 ` Steve Lord
2001-11-12 21:43 ` Andrew Morton
2001-11-12 21:45 ` Steve Lord
2001-11-12 21:48 ` Linus Torvalds [this message]
2001-11-12 22:11 ` Lionel Bouton
2001-11-12 19:41 ` Gérard Roudier
2001-11-12 22:14 ` Linus Torvalds
2001-11-12 22:30 ` Ragnar Kjørstad
2001-11-12 22:36 ` Andrew Morton
2001-11-12 23:04 ` Mike Castle
2001-11-13 9:56 ` Peter Wächtler
2001-11-13 9:41 ` Henning P. Schmiedehausen
2001-11-12 22:16 ` Andrew Morton
2001-11-12 22:26 ` Steve Lord
2001-11-12 22:32 ` Lionel Bouton
2001-11-12 22:45 ` Alan Cox
2001-11-12 22:39 ` Alan Cox
2001-11-12 22:39 ` Xavier Bestel
2001-11-12 22:46 ` Mike Castle
2001-11-12 21:53 ` Lionel Bouton
2001-11-13 0:17 ` Andreas Dilger
2001-11-13 0:40 ` Peter J . Braam
2001-11-13 20:46 ` Andreas Dilger
2001-11-16 22:07 ` Peter J . Braam
2001-11-16 23:14 ` Mike Fedyk
2001-11-12 16:40 ` Ben Israel
2001-11-12 17:29 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2001-11-12 22:36 Grant Erickson
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