From: Andrea Arcangeli <aarcange@redhat.com>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: CAI Qian <caiqian@redhat.com>, linux-mm <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: kswapd hung tasks in 2.6.38-rc1
Date: Tue, 1 Feb 2011 00:13:01 +0100 [thread overview]
Message-ID: <20110131231301.GP16981@random.random> (raw)
In-Reply-To: <1296513616.7797.4929.camel@nimitz>
On Mon, Jan 31, 2011 at 02:40:16PM -0800, Dave Hansen wrote:
> Still not a very good data point, but I ran a heavy swap load for an
> hour or so without reproducing this. But, it happened again after I
> enabled transparent huge pages. I managed to get a sysrq-t dump out of
> it:
>
> http://sr71.net/~dave/ibm/2.6.38-rc2-hang-0.txt
>
> khugepaged is one of the three running tasks. Note, I set both its
> sleep timeouts to zero to stress it out a bit.
sysrq+l? sysrq+t doesn't provide interesting info for running tasks.
> I'll keep trying to reproduce without THP.
BTW, do you have prove locking enabled? With recent git I get a
deadlock inside _raw_spin_unlock_irq with prove locking enabled and it
goes away when I disable it.
WARNING: multiple messages have this Message-ID (diff)
From: Andrea Arcangeli <aarcange@redhat.com>
To: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: CAI Qian <caiqian@redhat.com>, linux-mm <linux-mm@kvack.org>,
linux-kernel@vger.kernel.org
Subject: Re: kswapd hung tasks in 2.6.38-rc1
Date: Tue, 1 Feb 2011 00:13:01 +0100 [thread overview]
Message-ID: <20110131231301.GP16981@random.random> (raw)
In-Reply-To: <1296513616.7797.4929.camel@nimitz>
On Mon, Jan 31, 2011 at 02:40:16PM -0800, Dave Hansen wrote:
> Still not a very good data point, but I ran a heavy swap load for an
> hour or so without reproducing this. But, it happened again after I
> enabled transparent huge pages. I managed to get a sysrq-t dump out of
> it:
>
> http://sr71.net/~dave/ibm/2.6.38-rc2-hang-0.txt
>
> khugepaged is one of the three running tasks. Note, I set both its
> sleep timeouts to zero to stress it out a bit.
sysrq+l? sysrq+t doesn't provide interesting info for running tasks.
> I'll keep trying to reproduce without THP.
BTW, do you have prove locking enabled? With recent git I get a
deadlock inside _raw_spin_unlock_irq with prove locking enabled and it
goes away when I disable it.
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next prev parent reply other threads:[~2011-01-31 23:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2056664954.83361.1295513496286.JavaMail.root@zmail06.collab.prod.int.phx2.redhat.com>
2011-01-20 8:55 ` kswapd hung tasks in 2.6.38-rc1 CAI Qian
2011-01-20 8:55 ` CAI Qian
2011-01-31 20:58 ` Dave Hansen
2011-01-31 20:58 ` Dave Hansen
2011-01-31 22:40 ` Dave Hansen
2011-01-31 22:40 ` Dave Hansen
2011-01-31 23:13 ` Andrea Arcangeli [this message]
2011-01-31 23:13 ` Andrea Arcangeli
2011-01-31 23:20 ` Dave Hansen
2011-01-31 23:20 ` Dave Hansen
2011-02-01 1:43 ` Dave Hansen
2011-02-01 1:43 ` Dave Hansen
2011-02-01 17:17 ` Dave Hansen
2011-02-01 17:17 ` Dave Hansen
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