From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: Christoph Lameter <cl@linux.com>, Mel Gorman <mgorman@suse.de>,
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>,
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 3/3] mm: slub: Default slub_max_order to 0
Date: Thu, 12 May 2011 15:04:12 -0500 [thread overview]
Message-ID: <1305230652.2575.72.camel@mulgrave.site> (raw)
In-Reply-To: <1305229447.2575.71.camel@mulgrave.site>
On Thu, 2011-05-12 at 14:44 -0500, James Bottomley wrote:
> On Thu, 2011-05-12 at 13:37 -0500, James Bottomley wrote:
> > On Thu, 2011-05-12 at 18:55 +0300, Pekka Enberg wrote:
> > > On Thu, 2011-05-12 at 10:43 -0500, James Bottomley wrote:
> > > > However, since you admit even you see problems, let's concentrate on
> > > > fixing them rather than recriminations?
> > >
> > > Yes, please. So does dropping max_order to 1 help?
> > > PAGE_ALLOC_COSTLY_ORDER is set to 3 in 2.6.39-rc7.
> >
> > Just booting with max_slab_order=1 (and none of the other patches
> > applied) I can still get the machine to go into kswapd at 99%, so it
> > doesn't seem to make much of a difference.
> >
> > Do you want me to try with the other two patches and max_slab_order=1?
>
> OK, so patches 1 + 2 plus setting slub_max_order=1 still manages to
> trigger the problem (kswapd spinning at 99%). This is still with
> PREEMPT; it's possible that non-PREEMPT might be better, so I'll try
> patches 1+2+3 with PREEMPT just to see if the perturbation is caused by
> it.
Confirmed, I'm afraid ... I can trigger the problem with all three
patches under PREEMPT. It's not a hang this time, it's just kswapd
taking 100% system time on 1 CPU and it won't calm down after I unload
the system.
James
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WARNING: multiple messages have this Message-ID (diff)
From: James Bottomley <James.Bottomley@HansenPartnership.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: Christoph Lameter <cl@linux.com>, Mel Gorman <mgorman@suse.de>,
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>,
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 3/3] mm: slub: Default slub_max_order to 0
Date: Thu, 12 May 2011 15:04:12 -0500 [thread overview]
Message-ID: <1305230652.2575.72.camel@mulgrave.site> (raw)
In-Reply-To: <1305229447.2575.71.camel@mulgrave.site>
On Thu, 2011-05-12 at 14:44 -0500, James Bottomley wrote:
> On Thu, 2011-05-12 at 13:37 -0500, James Bottomley wrote:
> > On Thu, 2011-05-12 at 18:55 +0300, Pekka Enberg wrote:
> > > On Thu, 2011-05-12 at 10:43 -0500, James Bottomley wrote:
> > > > However, since you admit even you see problems, let's concentrate on
> > > > fixing them rather than recriminations?
> > >
> > > Yes, please. So does dropping max_order to 1 help?
> > > PAGE_ALLOC_COSTLY_ORDER is set to 3 in 2.6.39-rc7.
> >
> > Just booting with max_slab_order=1 (and none of the other patches
> > applied) I can still get the machine to go into kswapd at 99%, so it
> > doesn't seem to make much of a difference.
> >
> > Do you want me to try with the other two patches and max_slab_order=1?
>
> OK, so patches 1 + 2 plus setting slub_max_order=1 still manages to
> trigger the problem (kswapd spinning at 99%). This is still with
> PREEMPT; it's possible that non-PREEMPT might be better, so I'll try
> patches 1+2+3 with PREEMPT just to see if the perturbation is caused by
> it.
Confirmed, I'm afraid ... I can trigger the problem with all three
patches under PREEMPT. It's not a hang this time, it's just kswapd
taking 100% system time on 1 CPU and it won't calm down after I unload
the system.
James
next prev parent reply other threads:[~2011-05-12 20:04 UTC|newest]
Thread overview: 157+ 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 ` Mel Gorman
2011-05-11 15:29 ` [PATCH 1/3] mm: slub: Do not wake kswapd for SLUBs speculative " Mel Gorman
2011-05-11 15:29 ` Mel Gorman
2011-05-11 20:38 ` David Rientjes
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 15:29 ` Mel Gorman
2011-05-11 20:38 ` David Rientjes
2011-05-11 20:38 ` David Rientjes
2011-05-11 21:10 ` Mel Gorman
2011-05-11 21:10 ` Mel Gorman
2011-05-12 17:25 ` Andrea Arcangeli
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 15:29 ` Mel Gorman
2011-05-11 20:38 ` David Rientjes
2011-05-11 20:38 ` David Rientjes
2011-05-11 20:53 ` James Bottomley
2011-05-11 20:53 ` James Bottomley
2011-05-11 21:09 ` Mel Gorman
2011-05-11 21:09 ` Mel Gorman
2011-05-11 22:27 ` David Rientjes
2011-05-11 22:27 ` David Rientjes
2011-05-13 10:14 ` Mel Gorman
2011-05-13 10:14 ` Mel Gorman
2011-05-12 17:36 ` Andrea Arcangeli
2011-05-12 17:36 ` Andrea Arcangeli
2011-05-16 21:03 ` David Rientjes
2011-05-16 21:03 ` David Rientjes
2011-05-17 9:48 ` Mel Gorman
2011-05-17 9:48 ` Mel Gorman
2011-05-17 19:25 ` David Rientjes
2011-05-17 19:25 ` David Rientjes
2011-05-12 14:43 ` Christoph Lameter
2011-05-12 14:43 ` Christoph Lameter
2011-05-12 15:15 ` James Bottomley
2011-05-12 15:15 ` James Bottomley
2011-05-12 15:27 ` Christoph Lameter
2011-05-12 15:27 ` Christoph Lameter
2011-05-12 15:43 ` James Bottomley
2011-05-12 15:43 ` James Bottomley
2011-05-12 15:46 ` Dave Jones
2011-05-12 15:46 ` Dave Jones
2011-05-12 16:00 ` James Bottomley
2011-05-12 16:00 ` James Bottomley
2011-05-12 16:08 ` Dave Jones
2011-05-12 16:08 ` Dave Jones
2011-05-12 16:27 ` Christoph Lameter
2011-05-12 16:27 ` Christoph Lameter
2011-05-12 16:30 ` James Bottomley
2011-05-12 16:30 ` James Bottomley
2011-05-12 16:48 ` Christoph Lameter
2011-05-12 16:48 ` Christoph Lameter
2011-05-12 17:46 ` Andrea Arcangeli
2011-05-12 17:46 ` Andrea Arcangeli
2011-05-12 18:00 ` Christoph Lameter
2011-05-12 18:00 ` Christoph Lameter
2011-05-12 18:18 ` Andrea Arcangeli
2011-05-12 18:18 ` Andrea Arcangeli
2011-05-12 17:06 ` Pekka Enberg
2011-05-12 17:06 ` Pekka Enberg
2011-05-12 17:11 ` Pekka Enberg
2011-05-12 17:11 ` Pekka Enberg
2011-05-12 17:38 ` Christoph Lameter
2011-05-12 17:38 ` Christoph Lameter
2011-05-12 18:00 ` Andrea Arcangeli
2011-05-12 18:00 ` Andrea Arcangeli
2011-05-13 9:49 ` Mel Gorman
2011-05-13 9:49 ` Mel Gorman
2011-05-15 16:39 ` Andrea Arcangeli
2011-05-15 16:39 ` Andrea Arcangeli
2011-05-16 8:42 ` Mel Gorman
2011-05-16 8:42 ` Mel Gorman
2011-05-12 17:51 ` Andrea Arcangeli
2011-05-12 17:51 ` Andrea Arcangeli
2011-05-12 18:03 ` Christoph Lameter
2011-05-12 18:03 ` Christoph Lameter
2011-05-12 18:09 ` Andrea Arcangeli
2011-05-12 18:09 ` Andrea Arcangeli
2011-05-12 18:16 ` Christoph Lameter
2011-05-12 18:16 ` Christoph Lameter
2011-05-12 18:36 ` James Bottomley
2011-05-12 18:36 ` James Bottomley
2011-05-12 17:40 ` Andrea Arcangeli
2011-05-12 17:40 ` Andrea Arcangeli
2011-05-12 15:55 ` Pekka Enberg
2011-05-12 15:55 ` Pekka Enberg
2011-05-12 18:37 ` James Bottomley
2011-05-12 18:37 ` James Bottomley
2011-05-12 18:46 ` Christoph Lameter
2011-05-12 18:46 ` Christoph Lameter
2011-05-12 19:21 ` James Bottomley
2011-05-12 19:21 ` James Bottomley
2011-05-12 19:44 ` James Bottomley
2011-05-12 19:44 ` James Bottomley
2011-05-12 20:04 ` James Bottomley [this message]
2011-05-12 20:04 ` James Bottomley
2011-05-12 20:29 ` Johannes Weiner
2011-05-12 20:29 ` Johannes Weiner
2011-05-12 20:31 ` Johannes Weiner
2011-05-12 20:31 ` Johannes Weiner
2011-05-12 20:31 ` James Bottomley
2011-05-12 20:31 ` James Bottomley
2011-05-12 22:04 ` James Bottomley
2011-05-12 22:04 ` James Bottomley
2011-05-12 22:15 ` Johannes Weiner
2011-05-12 22:15 ` Johannes Weiner
2011-05-12 22:58 ` Minchan Kim
2011-05-12 22:58 ` Minchan Kim
2011-05-12 22:58 ` Minchan Kim
2011-05-13 5:39 ` Minchan Kim
2011-05-13 5:39 ` Minchan Kim
2011-05-13 0:47 ` James Bottomley
2011-05-13 0:47 ` James Bottomley
2011-05-13 4:12 ` James Bottomley
2011-05-13 4:12 ` James Bottomley
2011-05-13 10:55 ` Mel Gorman
2011-05-13 10:55 ` Mel Gorman
2011-05-13 14:16 ` James Bottomley
2011-05-13 14:16 ` James Bottomley
2011-05-13 10:30 ` Mel Gorman
2011-05-13 10:30 ` Mel Gorman
2011-05-13 6:16 ` Pekka Enberg
2011-05-13 6:16 ` Pekka Enberg
2011-05-13 6:16 ` Pekka Enberg
2011-05-13 10:05 ` Mel Gorman
2011-05-13 10:05 ` Mel Gorman
2011-05-13 10:05 ` Mel Gorman
2011-05-12 16:01 ` Christoph Lameter
2011-05-12 16:01 ` Christoph Lameter
2011-05-12 16:10 ` Eric Dumazet
2011-05-12 16:10 ` Eric Dumazet
2011-05-12 16:10 ` Eric Dumazet
2011-05-12 17:37 ` Andrew Morton
2011-05-12 17:37 ` Andrew Morton
2011-05-12 15:45 ` Dave Jones
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 21:39 ` James Bottomley
2011-05-11 22:28 ` David Rientjes
2011-05-11 22:28 ` David Rientjes
2011-05-11 22:34 ` James Bottomley
2011-05-11 22:34 ` James Bottomley
2011-05-12 11:13 ` Pekka Enberg
2011-05-12 11:13 ` Pekka Enberg
2011-05-12 13:19 ` Mel Gorman
2011-05-12 13:19 ` Mel Gorman
2011-05-12 14:04 ` James Bottomley
2011-05-12 14:04 ` James Bottomley
2011-05-12 15:53 ` James Bottomley
2011-05-13 11:25 ` Mel Gorman
2011-05-13 11:25 ` Mel Gorman
2011-05-12 18:04 ` Andrea Arcangeli
2011-05-12 18:04 ` Andrea Arcangeli
2011-05-13 11:24 ` Mel Gorman
2011-05-13 11:24 ` Mel Gorman
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