From: Mel Gorman <mgorman@suse.de>
To: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>,
David Rientjes <rientjes@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Colin King <colin.king@canonical.com>,
Raghavendra D Prabhu <raghu.prabhu13@gmail.com>,
Jan Kara <jack@suse.cz>, Chris Mason <chris.mason@oracle.com>,
Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
linux-ext4 <linux-ext4@vger.kernel.org>
Subject: Re: [PATCH 0/3] Reduce impact to overall system of SLUB using high-order allocations
Date: Fri, 13 May 2011 12:25:45 +0100 [thread overview]
Message-ID: <20110513112545.GG3569@suse.de> (raw)
In-Reply-To: <1305215624.2575.52.camel@mulgrave.site>
On Thu, May 12, 2011 at 10:53:44AM -0500, James Bottomley wrote:
> On Thu, 2011-05-12 at 09:04 -0500, James Bottomley wrote:
> > On Thu, 2011-05-12 at 14:13 +0300, Pekka Enberg wrote:
> > > On 5/12/11 1:34 AM, James Bottomley wrote:
> > > > On Wed, 2011-05-11 at 15:28 -0700, David Rientjes wrote:
> > > >> On Wed, 11 May 2011, James Bottomley wrote:
> > > >>
> > > >>> OK, I confirm that I can't seem to break this one. No hangs visible,
> > > >>> even when loading up the system with firefox, evolution, the usual
> > > >>> massive untar, X and even a distribution upgrade.
> > > >>>
> > > >>> You can add my tested-by
> > > >>>
> > > >> Your system still hangs with patches 1 and 2 only?
> > > > Yes, but only once in all the testing. With patches 1 and 2 the hang is
> > > > much harder to reproduce, but it still seems to be present if I hit it
> > > > hard enough.
> > >
> > > Patches 1-2 look reasonable to me. I'm not completely convinced of patch
> > > 3, though. Why are we seeing these problems now? This has been in
> > > mainline for a long time already. Shouldn't we fix kswapd?
> >
> > So I'm open to this. The hang occurs when kswapd races around in
> > shrink_slab and never exits. It looks like there's a massive number of
> > wakeups triggering this, but we haven't been able to diagnose it
> > further. turning on PREEMPT gets rid of the hang, so I could try to
> > reproduce with PREEMPT and turn on tracing. The problem so far has been
> > that the number of events is so huge that the trace buffer only captures
> > a few microseconds of output.
>
> OK, here's the trace from a PREEMPT kernel (2.6.38.6) when kswapd hits
> 99% and stays there. I've only enabled the vmscan tracepoints to try
> and get a longer run. It mosly looks like kswapd waking itself, but
> there might be more in there that mm trained eyes can see.
>
For 2.6.38.6, commit [2876592f: mm: vmscan: stop reclaim/compaction
earlier due to insufficient progress if !__GFP_REPEAT] may also be
needed if CONFIG_COMPACTION if set.
--
Mel Gorman
SUSE Labs
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next prev parent reply other threads:[~2011-05-13 11:25 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-11 15:29 [PATCH 0/3] Reduce impact to overall system of SLUB using high-order allocations Mel Gorman
2011-05-11 15:29 ` [PATCH 1/3] mm: slub: Do not wake kswapd for SLUBs speculative " Mel Gorman
2011-05-11 20:38 ` David Rientjes
2011-05-11 15:29 ` [PATCH 2/3] mm: slub: Do not take expensive steps " Mel Gorman
2011-05-11 20:38 ` David Rientjes
2011-05-11 21:10 ` Mel Gorman
2011-05-12 17:25 ` Andrea Arcangeli
2011-05-11 15:29 ` [PATCH 3/3] mm: slub: Default slub_max_order to 0 Mel Gorman
2011-05-11 20:38 ` David Rientjes
2011-05-11 20:53 ` James Bottomley
2011-05-11 21:09 ` Mel Gorman
2011-05-11 22:27 ` David Rientjes
2011-05-13 10:14 ` Mel Gorman
2011-05-12 17:36 ` Andrea Arcangeli
2011-05-16 21:03 ` David Rientjes
2011-05-17 9:48 ` Mel Gorman
2011-05-17 19:25 ` David Rientjes
2011-05-12 14:43 ` Christoph Lameter
2011-05-12 15:15 ` James Bottomley
2011-05-12 15:27 ` Christoph Lameter
2011-05-12 15:43 ` James Bottomley
2011-05-12 15:46 ` Dave Jones
2011-05-12 16:00 ` James Bottomley
2011-05-12 16:08 ` Dave Jones
2011-05-12 16:27 ` Christoph Lameter
2011-05-12 16:30 ` James Bottomley
2011-05-12 16:48 ` Christoph Lameter
2011-05-12 17:46 ` Andrea Arcangeli
2011-05-12 18:00 ` Christoph Lameter
2011-05-12 18:18 ` Andrea Arcangeli
2011-05-12 17:06 ` Pekka Enberg
2011-05-12 17:11 ` Pekka Enberg
2011-05-12 17:38 ` Christoph Lameter
2011-05-12 18:00 ` Andrea Arcangeli
2011-05-13 9:49 ` Mel Gorman
2011-05-15 16:39 ` Andrea Arcangeli
2011-05-16 8:42 ` Mel Gorman
2011-05-12 17:51 ` Andrea Arcangeli
2011-05-12 18:03 ` Christoph Lameter
2011-05-12 18:09 ` Andrea Arcangeli
2011-05-12 18:16 ` Christoph Lameter
2011-05-12 18:36 ` James Bottomley
2011-05-12 17:40 ` Andrea Arcangeli
2011-05-12 15:55 ` Pekka Enberg
2011-05-12 18:37 ` James Bottomley
2011-05-12 18:46 ` Christoph Lameter
2011-05-12 19:21 ` James Bottomley
2011-05-12 19:44 ` James Bottomley
2011-05-12 20:04 ` James Bottomley
2011-05-12 20:29 ` Johannes Weiner
2011-05-12 20:31 ` Johannes Weiner
2011-05-12 20:31 ` James Bottomley
2011-05-12 22:04 ` James Bottomley
2011-05-12 22:15 ` Johannes Weiner
2011-05-12 22:58 ` Minchan Kim
2011-05-13 5:39 ` Minchan Kim
2011-05-13 0:47 ` James Bottomley
2011-05-13 4:12 ` James Bottomley
2011-05-13 10:55 ` Mel Gorman
2011-05-13 14:16 ` James Bottomley
2011-05-13 10:30 ` Mel Gorman
2011-05-13 6:16 ` Pekka Enberg
2011-05-13 10:05 ` Mel Gorman
2011-05-12 16:01 ` Christoph Lameter
2011-05-12 16:10 ` Eric Dumazet
2011-05-12 17:37 ` Andrew Morton
2011-05-12 15:45 ` Dave Jones
2011-05-11 21:39 ` [PATCH 0/3] Reduce impact to overall system of SLUB using high-order allocations James Bottomley
2011-05-11 22:28 ` David Rientjes
2011-05-11 22:34 ` James Bottomley
2011-05-12 11:13 ` Pekka Enberg
2011-05-12 13:19 ` Mel Gorman
2011-05-12 14:04 ` James Bottomley
2011-05-12 15:53 ` James Bottomley
2011-05-13 11:25 ` Mel Gorman [this message]
2011-05-12 18:04 ` Andrea Arcangeli
2011-05-13 11:24 ` Mel Gorman
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