From: Andrea Arcangeli <andrea@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Christopher S. Swingley" <cswingle@iarc.uaf.edu>,
linux-kernel@vger.kernel.org
Subject: Re: Linux 2.4.13-ac1
Date: Fri, 26 Oct 2001 19:43:01 +0200 [thread overview]
Message-ID: <20011026194301.M30905@athlon.random> (raw)
In-Reply-To: <20011026092359.A9384@iarc.uaf.edu> <E15xAso-0000mW-00@the-village.bc.nu>
In-Reply-To: <E15xAso-0000mW-00@the-village.bc.nu>; from alan@lxorguk.ukuu.org.uk on Fri, Oct 26, 2001 at 06:35:02PM +0100
On Fri, Oct 26, 2001 at 06:35:02PM +0100, Alan Cox wrote:
> > Does this mean the ac tree now uses the AA VM, or is this a merge
> > with everything but the VM, like the earlier 2.4.1x-ac trees?
>
> It still uses buffer cache based raw disk access (so things like DVD players
btw, AFIK the fact dvd player can hang some millisecond across a
close/open cycle, isn't really because of the blkdev in pagecache but
simply because the <2.4.10 buffer cache layer wasn't able to do proper
readahead on the blkdev. Now we do readahead properly and so in turn
the the lack of media-change trust of the vfs shows up. So as far I can
tell the right fix have no influence on the blkdev in pagecache, but it
only consists in resurrecting the media-change detection with a
per-device bitflag whitelist. I cannot see other source of stalls across
a close/open cycle.
Andrea
next prev parent reply other threads:[~2001-10-26 17:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.kgfmokv.12jgvrv@ifi.uio.no>
2001-10-26 16:04 ` Linux 2.4.13-ac1 John Weber
2001-10-26 17:23 ` Christopher S. Swingley
2001-10-26 17:35 ` Alan Cox
2001-10-26 17:43 ` Andrea Arcangeli [this message]
2001-10-26 17:54 ` Alan Cox
2001-10-26 18:00 ` Andrea Arcangeli
2001-10-26 14:50 Alan Cox
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