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    SubjectRe: [RCU problem] was VFS: file-max limit 50044 reached
    On Mon, Oct 17, 2005 at 02:10:09PM +0200, Eric Dumazet wrote:
    > Dipankar Sarma a écrit :
    > >On Mon, Oct 17, 2005 at 11:10:04AM +0200, Eric Dumazet wrote:
    > >
    > >Agreed. It is not designed to work that way, so there must be
    > >a bug somewhere and I am trying to track it down. It could very well
    > >be that at maxbatch=10 we are just queueing at a rate far too high
    > >compared to processing.
    > >
    >
    > I can freeze my test machine with a program that 'only' use dentries, no
    > files.
    >
    > No message, no panic, but machine becomes totally unresponsive after few
    > seconds.
    >
    > Just greping for call_rcu in kernel sources gave me another call_rcu() use
    > from syscalls. And yes 2.6.13 has the same problem.

    Can you try it with rcupdate.maxbatch set to 10000 in boot
    command line ?

    FWIW, the open/close test problem goes away if I set maxbatch to
    10000. I had introduced this limit some time ago to curtail
    the effect long running softirq handlers have on scheduling
    latencies, which now conflicts with OOM avoidance requirements.

    Thanks
    Dipankar
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