From: "Steven N. Hirsch" <shirsch@adelphia.net>
To: Andrew Morton <akpm@zip.com.au>
Cc: lkml <linux-kernel@vger.kernel.org>,
"ext3-users@redhat.com" <ext3-users@redhat.com>
Subject: Re: ext3-0.9.15 against linux-2.4.14
Date: Tue, 6 Nov 2001 13:09:42 -0500 (EST) [thread overview]
Message-ID: <Pine.LNX.4.33.0111061305540.8366-100000@atx.fast.net> (raw)
In-Reply-To: <3BE7AB6C.97749631@zip.com.au>
On Tue, 6 Nov 2001, Andrew Morton wrote:
> Download details and documentation are at
>
> http://www.uow.edu.au/~andrewm/linux/ext3/
>
> Changes since ext3-0.9.13 (which was against linux-2.4.13):
>
> - For a long time, the ext3 patch has used a semaphore in the core
> kernel to prevent concurrent pagein and truncate of the same
> file. This was to prevent a race wherein the paging-in task
> would wake up after the truncate and would instantiate a page
> in the process's page tables which had attached buffers. This
> leads to a BUG() if the swapout code tries to swap the page out.
>
> This semaphore has been removed. The swapout code has been altered
> to simply detect and ignore these pages.
>
> This is an incredibly obscure and hard-to-hit situation. The testcase
> which used to trigger it can no longer do so. So if anyone sees the
> message "try_to_swap_out: page has buffers!", please shout out.
Andrew,
I have been getting thousands of these when the system was under heavy
load, but didn't realize it was from the ext3 code! I'm using Linus's
2.4.14-pre7 + ext3 patch from Neil Brown's site (the latter is identified
as "ZeroNineFourteen".) Would you like me to upgrade kernel and patch?
Steve
next prev parent reply other threads:[~2001-11-06 18:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-06 9:20 ext3-0.9.15 against linux-2.4.14 Andrew Morton
2001-11-06 9:42 ` Alan Cox
2001-11-06 18:09 ` Steven N. Hirsch [this message]
2001-11-06 18:49 ` Andrew Morton
2001-11-07 0:31 ` Stephen Tweedie
2001-11-07 17:59 ` Andrew Morton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Pine.LNX.4.33.0111061305540.8366-100000@atx.fast.net \
--to=shirsch@adelphia.net \
--cc=akpm@zip.com.au \
--cc=ext3-users@redhat.com \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).