sched/nohz: Fix nohz cpu idle load balancing state with cpu hotplug
With the recent nohz scheduler changes, rq's nohz flag 'NOHZ_TICK_STOPPED' and its associated state doesn't get cleared immediately after the cpu exits idle. This gets cleared as part of the next tick seen on that cpu. For the cpu offline support, we need to clear this state manually. Fix it by registering a cpu notifier, which clears the nohz idle load balance state for this rq explicitly during the CPU_DYING notification. There won't be any nohz updates for that cpu, after the CPU_DYING notification. But lets be extra paranoid and skip updating the nohz state in the select_nohz_load_balancer() if the cpu is not in active state anymore. Reported-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Reviewed-and-tested-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Tested-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1327026538.16150.40.camel@sbsiddha-desk.sc.intel.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -4866,6 +4866,15 @@ static void nohz_balancer_kick(int cpu)
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return;
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return;
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}
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}
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static inline void clear_nohz_tick_stopped(int cpu)
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{
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if (unlikely(test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))) {
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cpumask_clear_cpu(cpu, nohz.idle_cpus_mask);
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atomic_dec(&nohz.nr_cpus);
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clear_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu));
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}
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}
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static inline void set_cpu_sd_state_busy(void)
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static inline void set_cpu_sd_state_busy(void)
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{
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{
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struct sched_domain *sd;
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struct sched_domain *sd;
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@ -4904,6 +4913,12 @@ void select_nohz_load_balancer(int stop_tick)
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{
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{
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int cpu = smp_processor_id();
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int cpu = smp_processor_id();
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/*
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* If this cpu is going down, then nothing needs to be done.
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*/
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if (!cpu_active(cpu))
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return;
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if (stop_tick) {
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if (stop_tick) {
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if (test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))
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if (test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))
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return;
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return;
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@ -4914,6 +4929,18 @@ void select_nohz_load_balancer(int stop_tick)
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}
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}
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return;
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return;
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}
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}
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static int __cpuinit sched_ilb_notifier(struct notifier_block *nfb,
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unsigned long action, void *hcpu)
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{
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switch (action & ~CPU_TASKS_FROZEN) {
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case CPU_DYING:
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clear_nohz_tick_stopped(smp_processor_id());
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return NOTIFY_OK;
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default:
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return NOTIFY_DONE;
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}
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}
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#endif
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#endif
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static DEFINE_SPINLOCK(balancing);
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static DEFINE_SPINLOCK(balancing);
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@ -5070,11 +5097,7 @@ static inline int nohz_kick_needed(struct rq *rq, int cpu)
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* busy tick after returning from idle, we will update the busy stats.
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* busy tick after returning from idle, we will update the busy stats.
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*/
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*/
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set_cpu_sd_state_busy();
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set_cpu_sd_state_busy();
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if (unlikely(test_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu)))) {
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clear_nohz_tick_stopped(cpu);
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clear_bit(NOHZ_TICK_STOPPED, nohz_flags(cpu));
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cpumask_clear_cpu(cpu, nohz.idle_cpus_mask);
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atomic_dec(&nohz.nr_cpus);
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}
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/*
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/*
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* None are in tickless mode and hence no need for NOHZ idle load
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* None are in tickless mode and hence no need for NOHZ idle load
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@ -5590,6 +5613,7 @@ __init void init_sched_fair_class(void)
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#ifdef CONFIG_NO_HZ
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#ifdef CONFIG_NO_HZ
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zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
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zalloc_cpumask_var(&nohz.idle_cpus_mask, GFP_NOWAIT);
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cpu_notifier(sched_ilb_notifier, 0);
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#endif
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#endif
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#endif /* SMP */
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#endif /* SMP */
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