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    SubjectRe: iotop: khugepaged at 99.99% (2.6.38.X)
    On Fri, May 06, 2011 at 10:49:45AM +0200, Thomas Sattler wrote:
    > > You can already run "grep threshold /proc/zoneinfo" on the system
    > > where you reproduced the hang the last time (the one running 2.6.38.4)
    > > the one with 1.5G of ram. They all should be well below 512 (so in
    > > theory not causing troubles because of the per-cpu stats, and with so
    > > few cpus it shouldn't have been such a longstanding problem anyway).
    >
    > 'grep threshold /proc/zoneinfo' returns nothing on this machine after
    > a reboot and before a crash. Did I tell it's a single core machine?

    Hmm single core machine doesn't seem to fit my theory of per-cpu stats
    too well... I think it's not impossible but it should only be possible
    on smp and maybe it's not reproducible and probably not what you're
    dealing with.

    The new make-it-worse-patch should help to reproduce though.

    If you can "cat /proc/zoneinfo" _during_ the hang (and then run
    sysrq+t again to see the status, no need of sysrq+l), it'll help to
    try to track this down. I'll recheck your last sysrq+t once again to
    see if I get other ideas.

    A 'cat /proc/zoneinfo' after the hang resolves itself and the system
    is mostly idle, will also be interesting to verify the nr_isolated_*
    are all zero.

    Thanks,
    Andrea


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