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    SubjectRe: WARNING: at kernel/rcutree.c:1558 rcu_do_batch+0x386/0x3a0(), during CPU hotplug
    On Fri, Sep 14, 2012 at 02:25:19PM +0200, Peter Zijlstra wrote:
    > On Fri, 2012-09-14 at 17:48 +0530, Srivatsa S. Bhat wrote:
    > > #! /bin/bash
    >
    > CPUPATH="/sys/devices/system/cpu"
    >
    > > NUMBER_OF_CPUS=`ls -d /sys/devices/system/cpu/cpu[0-9]* | wc -l`
    >
    > apply the above
    >
    > > cd /sys/devices/system/cpu
    >
    > skip this, so running the script doesn't change PWD

    Yes, that's good practice.

    > > while [ 1 ]
    >
    > while :;

    I used to use 'true', but ':' looks cool!

    > > do
    > > for ((i=1; i < NUMBER_OF_CPUS; i++))
    > > do
    > > sleep 1;
    >
    > Also play with shorter sleeps like: sleep .1, I've found that higher
    > hotplug rate triggers some races faster.

    OK.

    > > state=`cat cpu$i/online`
    > > if [ $state -eq 0 ]
    > > then
    > > echo 1 > cpu$i/online
    > > else
    > > echo 0 > cpu$i/online
    >
    > echo $((state^1)) > $CPUPATH/cpu$i/online

    Good!

    Thanks,
    Fengguang


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