On hot-unplug flush the pending wakeup queue by selecting a new rq for each of them and requeueing them appropriately. Signed-off-by: Peter Zijlstra --- kernel/sched.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) Index: linux-2.6/kernel/sched.c =================================================================== --- linux-2.6.orig/kernel/sched.c +++ linux-2.6/kernel/sched.c @@ -2526,6 +2526,29 @@ static void ttwu_queue(struct task_struc raw_spin_unlock(&rq->lock); } +#ifdef CONFIG_HOTPLUG_CPU +static void ttwu_queue_unplug(struct rq *rq) +{ + struct task_struct *p, *list = xchg(&rq->wake_list, NULL); + unsigned long flags; + int cpu; + + if (!list) + return; + + while (list) { + p = list; + list = list->wake_entry; + + raw_spin_lock_irqsave(&p->pi_lock, flags); + cpu = select_task_rq(p, SD_BALANCE_WAKE, 0); + set_task_cpu(p, cpu); + ttwu_queue(p, cpu); + raw_spin_unlock_irqrestore(&p->pi_lock, flags); + } +} +#endif + /** * try_to_wake_up - wake up a thread * @p: the thread to be awakened @@ -6151,6 +6174,11 @@ migration_call(struct notifier_block *nf migrate_nr_uninterruptible(rq); calc_global_load_remove(rq); break; + + case CPU_DEAD: + ttwu_queue_unplug(cpu_rq(cpu)); + break; + #endif } return NOTIFY_OK; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/