linux-kernel - Re: iotop: khugepaged at 99.99% (2.6.38.3)

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Date:	Wed, 14 Sep 2011 05:57:54 -0700 (PDT)
From:	Slawomir Czarko-Wasiutycz <slawomir.czarko@...il.com>
To:	fa.linux.kernel@...glegroups.com
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: iotop: khugepaged at 99.99% (2.6.38.3)

On Thursday, April 21, 2011 1:28:18 AM UTC+2, Thomas Sattler wrote:
> Hi there ...
> 
> While running firefox (>50 open Tabs), khugepaged jumped to 99.99%
> (according to 'iotop').  I killed firefox and nearly all running
> programs but khugepaged was still at 99.99% IO while the system
> was almost idle. I waited about 10 minutes, no improvement, so
> I rebooted the machine.
> 
Hi,

I have a similar problem.

System becomes unresponsive for few seconds up to a minute or so.

In my case the trigger seems to be compiling code in a Linux VM running in VMplayer.

Problem seems to go away if I do:

echo madvise > /sys/kernel/mm/transparent_hugepage/defrag

Kernel used: kernel-PAE-2.6.40.4-5.fc15.i686 SMP CONFIG_PREEMPT=n

Right now I'm trying the same kernel with CONFIG_PREEMPT=y and it looks like the problem doesn't occur.
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