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rcu: Rationalize kthread spawning

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Currently, RCU spawns kthreads from several different early_initcall()
functions.  Although this has served RCU well for quite some time,
as more kthreads are added a more deterministic approach is required.
This commit therefore causes all of RCU's early-boot kthreads to be
spawned from a single early_initcall() function.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Tested-by: Paul Gortmaker <paul.gortmaker@windriver.com>
This commit is contained in:
Paul E. McKenney 2014-07-13 12:00:53 -07:00
parent f4aa84ba24
commit 9386c0b75d
3 changed files with 7 additions and 10 deletions
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4
kernel/rcu/tree.c
View File

@ -3489,7 +3489,7 @@ static int rcu_pm_notify(struct notifier_block *self,
}
/*
* Spawn the kthread that handles this RCU flavor's grace periods.
* Spawn the kthreads that handle each RCU flavor's grace periods.
*/
static int __init rcu_spawn_gp_kthread(void)
{
@ -3498,6 +3498,7 @@ static int __init rcu_spawn_gp_kthread(void)
struct rcu_state *rsp;
struct task_struct *t;
rcu_scheduler_fully_active = 1;
for_each_rcu_flavor(rsp) {
t = kthread_run(rcu_gp_kthread, rsp, "%s", rsp->name);
BUG_ON(IS_ERR(t));
@ -3507,6 +3508,7 @@ static int __init rcu_spawn_gp_kthread(void)
raw_spin_unlock_irqrestore(&rnp->lock, flags);
rcu_spawn_nocb_kthreads(rsp);
}
rcu_spawn_boost_kthreads();
return 0;
}
early_initcall(rcu_spawn_gp_kthread);

1
kernel/rcu/tree.h
View File

@ -572,6 +572,7 @@ static void rcu_preempt_do_callbacks(void);
static int rcu_spawn_one_boost_kthread(struct rcu_state *rsp,
struct rcu_node *rnp);
#endif /* #ifdef CONFIG_RCU_BOOST */
static void __init rcu_spawn_boost_kthreads(void);
static void rcu_prepare_kthreads(int cpu);
static void rcu_cleanup_after_idle(int cpu);
static void rcu_prepare_for_idle(int cpu);

12
kernel/rcu/tree_plugin.h
View File

@ -1435,14 +1435,13 @@ static struct smp_hotplug_thread rcu_cpu_thread_spec = {
};
/*
* Spawn all kthreads -- called as soon as the scheduler is running.
* Spawn boost kthreads -- called as soon as the scheduler is running.
*/
static int __init rcu_spawn_kthreads(void)
static void __init rcu_spawn_boost_kthreads(void)
{
struct rcu_node *rnp;
int cpu;
rcu_scheduler_fully_active = 1;
for_each_possible_cpu(cpu)
per_cpu(rcu_cpu_has_work, cpu) = 0;
BUG_ON(smpboot_register_percpu_thread(&rcu_cpu_thread_spec));
@ -1452,9 +1451,7 @@ static int __init rcu_spawn_kthreads(void)
rcu_for_each_leaf_node(rcu_state_p, rnp)
(void)rcu_spawn_one_boost_kthread(rcu_state_p, rnp);
}
return 0;
}
early_initcall(rcu_spawn_kthreads);
static void rcu_prepare_kthreads(int cpu)
{
@ -1492,12 +1489,9 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu)
{
}
static int __init rcu_scheduler_really_started(void)
static void __init rcu_spawn_boost_kthreads(void)
{
rcu_scheduler_fully_active = 1;
return 0;
}
early_initcall(rcu_scheduler_really_started);
static void rcu_prepare_kthreads(int cpu)
{