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    SubjectRe: kmemleak, cpu usage jump out of nowhere
    Zeno Davatz wrote:
    > On Wed, Jul 14, 2010 at 10:31 AM, Damien Wyart <damien.wyart@free.fr> wrote:
    >
    >>> On Wed, Jul 14, 2010 at 9:12 AM, Zeno Davatz <zdavatz@gmail.com> wrote:
    >>>> I got a new Intel core-8 i7 processor.
    >>>> I am on kernel uname -a
    >>>> Linux zenogentoo 2.6.35-rc5 #97 SMP Tue Jul 13 16:13:25 CEST 2010 i686
    >>>> Intel(R) Core(TM) i7 CPU 960 @ 3.20GHz GenuineIntel GNU/Linux
    >>>> Sometimes in the middle of nowhere all of a sudden all of my 8-cores
    >>>> are at 100% CPU usage and my machine really lags and hangs and is not
    >>>> useable anymore. Some random process just grabs a bunch CPUs according
    >>>> to htop.
    >> * Pekka Enberg <penberg@cs.helsinki.fi> [2010-07-14 11:05]:
    >>> Why did you enable CONFIG_DEBUG_KMEMLEAK? Memory leak scanning is
    >>> likely the source of these pauses.
    >> I am seeing the same problem with a Core i7 920 and 2.6.35-rc5, and I do
    >> not have CONFIG_DEBUG_KMEMLEAK enabled, so I think this is not related.
    >>
    >> I do not see anything special in the logs, just the load becoming mad
    >> and almost preventing ssh access. I've been seeing that since the first
    >> 2.6.35 rc I tested (-rc2 or -rc3, I don't remember) and I did not have
    >> time to report it before but I was surprised nobody else did. No problem
    >> with 2.6.34 and 2.6.34.1.
    >
    > same with me. My last build I tested was 2.6.34-rc7. No problems
    > there. No CPU jumps out of nowhere.
    >
    > It is like any application all of a sudden use 400% CPU i.e. htop.

    Interesting. Lets CC some scheduler folks for help.

    Pekka


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