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[Bug 721896] Re: kswapd0 100% cpu usage

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Stanislaw Halik <sthalik@xxxxxxxxx>
Date: Tue, 12 Aug 2014 07:52:10 -0000
Reply-to: Bug 721896 <721896@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

% grep  /proc/[0-9]*/comm
% cat $(dirname $(grep kswapd /proc/[0-9]*/comm))/wchan; echo

Do this when irrational CPU usage occurs. Show wchan. If
contention_wait, there's a fix. Anyway wchan is helpful.

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https://bugs.launchpad.net/bugs/721896

Title:
  kswapd0 100% cpu usage

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  After the running the latest ubuntu for at least 2 weeks, I've noticed that kswapd0 started using 100% CPU on one of my cores.
  However, I have enough of RAM and not using swap (Swap: 11876344k total,    62336k used).

  The only thing I can do to remove the problem is reboot the system.
  I'm using Ubuntu 10.04.1 LTS server version without any kernel modifications.

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