From: Andrew Morton <akpm@linux-foundation.org>
To: James Bottomley <James.Bottomley@suse.de>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Ying Han <yinghan@google.com>,
Chris Mason <chris.mason@oracle.com>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Paul Menage <menage@google.com>, Li Zefan <lizf@cn.fujitsu.com>,
containers@lists.linux-foundation.org,
Balbir Singh <balbir@linux.vnet.ibm.com>
Subject: Re: memcg: fix fatal livelock in kswapd
Date: Thu, 5 May 2011 14:00:00 -0700 [thread overview]
Message-ID: <20110505140000.e4f315b5.akpm@linux-foundation.org> (raw)
In-Reply-To: <1304431865.2576.3.camel@mulgrave.site>
The trail seems to have cooled off here, but it's pretty urgent.
Having re-read the threads I find it notable that James hit a kswapd
softlockup with "non-PREEMPT CGROUP but disabled GROUP_MEM_RES_CTLR".
This suggests that the problem isn't with memcg. Or at least, we
should fix this kswapd lockup before worrying about memcg.
And I'm not sure that we should be assuming that there's something
wrong in shrink_slab(). We know that kswapd has gone berserk, and that
it will frequently call shrink_slab() when in that mode. But this may
be because the top-level balance_pgdat() loop isn't terminating for
reasons unrelated to shrink_slab().
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next prev parent reply other threads:[~2011-05-05 21:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-02 20:07 memcg: fix fatal livelock in kswapd James Bottomley
2011-05-02 22:48 ` Johannes Weiner
2011-05-02 23:14 ` Ying Han
2011-05-02 23:58 ` James Bottomley
2011-05-03 6:38 ` Johannes Weiner
2011-05-03 14:11 ` James Bottomley
2011-05-05 21:00 ` Andrew Morton [this message]
2011-05-03 6:11 ` Johannes Weiner
2011-05-07 21:59 ` Balbir Singh
2011-05-07 22:00 ` Balbir Singh
2011-05-02 22:53 ` Paul Menage
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