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

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Message-ID: <CAF1ivSZzUiwn+pqLCtOiCEDvjwpLXrXBkCL5OnsAW1vLdMY32w@mail.gmail.com>
Date:	Thu, 15 Sep 2011 14:48:12 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	fa.linux.kernel@...glegroups.com, slawomir.czarko@...il.com
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Thomas Sattler <tsattler@....de>
Subject: Re: iotop: khugepaged at 99.99% (2.6.38.3)

On Thu, Sep 15, 2011 at 2:43 PM, Lin Ming <mlin@...pku.edu.cn> wrote:
> On Wed, Sep 14, 2011 at 8:57 PM, Slawomir Czarko-Wasiutycz
> <slawomir.czarko@...il.com> wrote:
>> 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
>
> (Add Thomas and Andrea)
>
> Hi, Thomas
>
> Do you still see this problem on latest kernel(2.6.31-rc6)?
> I try to run firefox (>50 open Tabs), but can't reproduce this on
> 2.6.31-rc6 kernel.

Sorry, I mean 3.1-rc6
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