From: Andrew Morton <akpm@osdl.org>
To: Ram Pai <linuxram@us.ibm.com>
Cc: adilger@clusterfs.com, slpratt@austin.ibm.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH/RFC] Simplified Readahead
Date: Wed, 29 Sep 2004 22:29:38 -0700 [thread overview]
Message-ID: <20040929222938.47d2f976.akpm@osdl.org> (raw)
In-Reply-To: <1096511206.5481.58.camel@dyn319181.beaverton.ibm.com>
Ram Pai <linuxram@us.ibm.com> wrote:
>
> On Wed, 2004-09-29 at 16:13, Andreas Dilger wrote:
> > On a readahead-related note, I'm wondering how hard it would be to have
> > some tunables and/or hooks from the readahead state manchine made
> > available to the filesystem? With the 2.4 readahead code it was basically
> > impossible for the filesystem to disable the readahead, I haven't looked
> > at the 2.6 readahead enough to determine whether we need that or not.
> >
> The best way currently to shutoff readahead is to poke into the file
> descriptors' readahead structure and set ra_pages to 0.
fadvise(fd, POSIX_FADV_RANDOM).
next prev parent reply other threads:[~2004-09-30 2:40 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-23 16:06 Steven Pratt
2004-09-23 22:14 ` Joel Schopp
2004-09-24 0:21 ` Nick Piggin
2004-09-24 2:42 ` Andrew Morton
2004-09-24 15:40 ` Steven Pratt
2004-09-24 16:16 ` Nick Piggin
2004-09-24 16:48 ` Steven Pratt
2004-09-24 22:05 ` Andrew Morton
2004-09-24 22:43 ` Steven Pratt
2004-09-24 23:01 ` Andrew Morton
2004-09-27 15:39 ` Steven Pratt
2004-09-27 19:26 ` Andrew Morton
2004-09-28 10:13 ` Jens Axboe
2004-09-24 22:55 ` Steven Pratt
2004-09-27 20:29 ` Ray Bryant
2004-09-27 21:04 ` Steven Pratt
2004-09-25 0:45 ` Nick Piggin
2004-09-25 1:01 ` Ram Pai
2004-09-25 6:07 ` Ram Pai
2004-09-27 15:30 ` Steven Pratt
2004-09-27 18:42 ` Ram Pai
2004-09-27 20:07 ` Steven Pratt
2004-09-29 18:46 ` Ram Pai
2004-09-29 22:33 ` Steven Pratt
2004-09-29 23:13 ` Andreas Dilger
2004-09-30 2:26 ` Ram Pai
2004-09-30 5:29 ` Andrew Morton [this message]
2004-09-30 20:20 ` Stephen C. Tweedie
2004-09-30 1:12 ` Ram Pai
2004-10-01 21:02 ` Steven Pratt
2004-10-05 17:52 ` Ram Pai
[not found] <372479081@toto.iv>
2004-09-24 5:00 ` Peter Chubb
2004-09-24 22:57 ` Steven Pratt
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