From: Jens Axboe <axboe@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: davej@redhat.com, AChittenden@bluearc.com,
linux-kernel@vger.kernel.org, lwoodman@redhat.com
Subject: Re: Out of Memory: Killed process 16498 (java).
Date: Fri, 20 Jan 2006 13:08:44 +0100 [thread overview]
Message-ID: <20060120120844.GG13429@suse.de> (raw)
In-Reply-To: <20060120002307.76bcbc27.akpm@osdl.org>
On Fri, Jan 20 2006, Andrew Morton wrote:
> Jens Axboe <axboe@suse.de> wrote:
> >
> > On Thu, Jan 19 2006, Andrew Morton wrote:
> > > Dave Jones <davej@redhat.com> wrote:
> > > >
> > > > On Thu, Jan 19, 2006 at 03:11:45PM -0000, Andy Chittenden wrote:
> > > > > DMA free:20kB min:24kB low:28kB high:36kB active:0kB inactive:0kB
> > > > > present:12740kB pages_scanned:4 all_unreclaimable? yes
> > > >
> > > > Note we only scanned 4 pages before we gave up.
> > > > Larry Woodman came up with this patch below that clears all_unreclaimable
> > > > when in two places where we've made progress at freeing up some pages
> > > > which has helped oom situations for some of our users.
> > >
> > > That won't help - there are exactly zero pages on ZONE_DMA's LRU.
> > >
> > > The problem appears to be that all of the DMA zone has been gobbled up by
> > > the BIO layer. It seems quite inappropriate that a modern 64-bit machine
> > > is allocating tons of disk I/O pages from the teeny ZONE_DMA. I'm
> > > suspecting that someone has gone and set a queue's ->bounce_gfp to the wrong
> > > thing.
> > >
> > > Jens, would you have time to investigate please?
> >
> > Certainly, I'll get this tested and fixed this afternoon.
>
> Wow ;)
>
> You may find it's an x86_64 glitch - setting max_[low_]pfn wrong down in
> the bowels of the arch mm init code, something like that.
>
> I thought it might have been a regression which came in when we added
> ZONE_DMA32 but the RH reporter is based on 2.6.14-<redhat stuff>, and he
> didn't have ZONE_DMA32.
Sorry, spoke too soon, I thought this was the 'bio/scsi leaks' which
most likely is a scsi leak that also results in the bios not getting
freed.
This DMA32 zone shortage looks like a vm short coming, you're likely the
better candidate to fix that :-)
--
Jens Axboe
next prev parent reply other threads:[~2006-01-20 12:06 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-19 15:11 Out of Memory: Killed process 16498 (java) Andy Chittenden
2006-01-19 19:48 ` Dave Jones
2006-01-19 22:15 ` Andrew Morton
2006-01-20 8:12 ` Jens Axboe
2006-01-20 8:23 ` Andrew Morton
2006-01-20 12:08 ` Jens Axboe [this message]
2006-01-20 12:17 ` Andrew Morton
2006-01-20 12:28 ` Jens Axboe
2006-01-20 12:51 ` Andrew Morton
2006-01-20 1:03 ` Andrew Morton
2006-01-20 1:28 ` Dave Jones
2006-01-20 1:49 ` Andrew Morton
2006-01-21 20:00 ` Dan Aloni
-- strict thread matches above, loose matches on Subject: below --
2006-01-27 11:53 Andy Chittenden
2006-01-27 14:21 ` Jens Axboe
2006-01-27 14:39 ` Anton Altaparmakov
2006-01-23 10:03 Andy Chittenden
2006-01-23 10:11 ` Jens Axboe
2006-01-21 21:47 Andy Chittenden
2006-01-23 9:27 ` Jens Axboe
[not found] <89E85E0168AD994693B574C80EDB9C27035561DE@uk-email.terastack.bluearc.com>
2006-01-20 17:39 ` Jens Axboe
[not found] <89E85E0168AD994693B574C80EDB9C27035560E4@uk-email.terastack.bluearc.com>
2006-01-20 12:37 ` Larry Woodman
[not found] <89E85E0168AD994693B574C80EDB9C2703555F8E@uk-email.terastack.bluearc.com>
2006-01-19 9:44 ` Andrew Morton
2006-01-19 9:40 Andy Chittenden
2006-01-19 9:41 ` Con Kolivas
2006-01-19 8:43 Andy Chittenden
2006-01-19 8:56 ` Andrew Morton
2006-01-19 9:36 ` Con Kolivas
2006-01-19 20:54 ` Martin Bligh
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=20060120120844.GG13429@suse.de \
--to=axboe@suse.de \
--cc=AChittenden@bluearc.com \
--cc=akpm@osdl.org \
--cc=davej@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=lwoodman@redhat.com \
/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).