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    sched: Fix nohz balance kick · f6c3f168
    Suresh Siddha 提交于
    There's a situation where the nohz balancer will try to wake itself:
    
    cpu-x is idle which is also ilb_cpu
    got a scheduler tick during idle
    and the nohz_kick_needed() in trigger_load_balance() checks for
    rq_x->nr_running which might not be zero (because of someone waking a
    task on this rq etc) and this leads to the situation of the cpu-x
    sending a kick to itself.
    
    And this can cause a lockup.
    
    Avoid this by not marking ourself eligible for kicking.
    Signed-off-by: NSuresh Siddha <suresh.b.siddha@intel.com>
    Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
    LKML-Reference: <1284400941.2684.19.camel@sbsiddha-MOBL3.sc.intel.com>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    f6c3f168
sched_fair.c 99.5 KB