linux-kernel - Re: iotop: khugepaged at 99.99% (2.6.38.X)

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Date:	Fri, 06 May 2011 16:24:04 +0200
From:	Thomas Sattler <tsattler@....de>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: iotop: khugepaged at 99.99% (2.6.38.X)

> Aaarg, wrong kernel tree. I patched and compiled 2.6.38.5.
> Do you think it is important to stay with 2.6.38.2, after
> we know 2.6.38.4 is also affected?

I bootet 2.6.38.5.aa1 ("aa1" for the "make-it-worse-patch")
but nothing happened within an hour. So I put some stress
on the system:

$ stress --cpu 80 --io 40 --vm 20 --vm-bytes 1280M --timeout 5s
stress: info: [31924] dispatching hogs: 80 cpu, 40 io, 20 vm, 0 hdd

The command _did_not_end_ after five seconds. I tried to
kill it after ~15 minutes. I had no success killing it.

"nr_isolated_anon" was "0" all the time. 'ps xal' hung its
terminal. Just like 'pkill stress', 'pkill firefox', 'pkill
thunderbird', 'pkill pkill' and 'pkill -9 stress'.

top/iotop: http://pastebin.com/raw.php?i=BCtmHpmX
ps xal:    http://pastebin.com/raw.php?i=ED71cuKe
zoneinfo:  http://pastebin.com/raw.php?i=aBNjz1Up

I hit SysRq-[lmtw] several times, you'll find all kernel
messages (/var/log/messages) from boot to reboot here:

  http://pastebin.com/raw.php?i=VG28YRbi

The system did not shutdown properly, I waited some time
for sshd to stop and eventually hit SysRq-sub.

Thomas
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