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

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Message-ID: <4DAF6C0B.3070009@gmx.de>
Date:	Thu, 21 Apr 2011 01:28:11 +0200
From:	Thomas Sattler <tsattler@....de>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: iotop: khugepaged at 99.99% (2.6.38.3)

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.

I observed this since 2.6.38 (I never run 2.6.37). This time the
system was still responsive. When I observed the same thing with
2.6.38.x (x<3), the system became unresponsive within minutes
after khugepaged hit 99%, see http://lkml.org/lkml/2011/4/7/306

All this happened five times since 2.6.38 became stable. It does
not happen at boot time, but days (or weeks) later.

Thomas

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