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rcu: Simplify curing of load woes

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Make the functions creating the kthreads wake them up.  Leverage the
fact that the per-node and boost kthreads can run anywhere, thus
dispensing with the need to wake them up once the incoming CPU has
gone fully online.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Tested-by: Daniel J Blueman <daniel.blueman@gmail.com>
This commit is contained in:
Paul E. McKenney 2011-05-30 20:38:55 -07:00
parent 59c5f46fbe
commit 9a43273690
2 changed files with 22 additions and 54 deletions
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11
kernel/rcutree_plugin.h
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@ -1299,15 +1299,10 @@ static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
raw_spin_unlock_irqrestore(&rnp->lock, flags);
sp.sched_priority = RCU_KTHREAD_PRIO;
sched_setscheduler_nocheck(t, SCHED_FIFO, &sp);
wake_up_process(t); /* get to TASK_INTERRUPTIBLE quickly. */
return 0;
}
static void __cpuinit rcu_wake_one_boost_kthread(struct rcu_node *rnp)
{
if (rnp->boost_kthread_task)
wake_up_process(rnp->boost_kthread_task);
}
#else /* #ifdef CONFIG_RCU_BOOST */
static void rcu_initiate_boost(struct rcu_node *rnp, unsigned long flags)
@ -1331,10 +1326,6 @@ static int __cpuinit rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
return 0;
}
static void __cpuinit rcu_wake_one_boost_kthread(struct rcu_node *rnp)
{
}
#endif /* #else #ifdef CONFIG_RCU_BOOST */
#ifndef CONFIG_SMP