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rcu: s/boost_kthread_mutex/kthread_mutex 

This mutex is currently protecting per node boost kthreads creation and
affinity setting across CPU hotplug operations.

Since the expedited kworkers will soon be split per node as well, they
will be subject to the same concurrency constraints against hotplug.

Therefore their creation and affinity tuning operations will be grouped
with those of boost kthreads and then rely on the same mutex.

To prepare for that, generalize its name.

Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Frederic Weisbecker 2024-01-12 16:46:17 +01:00 committed by Boqun Feng
parent e7539ffc9a
commit 7836b27060
3 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/rcu/tree.c
View File

@ -4918,7 +4918,7 @@ static void __init rcu_init_one(void)
init_waitqueue_head(&rnp->exp_wq[2]);
init_waitqueue_head(&rnp->exp_wq[3]);
spin_lock_init(&rnp->exp_lock);
mutex_init(&rnp->boost_kthread_mutex);
mutex_init(&rnp->kthread_mutex);
raw_spin_lock_init(&rnp->exp_poll_lock);
rnp->exp_seq_poll_rq = RCU_GET_STATE_COMPLETED;
INIT_WORK(&rnp->exp_poll_wq, sync_rcu_do_polled_gp);

2
kernel/rcu/tree.h
View File

@ -113,7 +113,7 @@ struct rcu_node {
/* side effect, not as a lock. */
unsigned long boost_time;
/* When to start boosting (jiffies). */
struct mutex boost_kthread_mutex;
struct mutex kthread_mutex;
/* Exclusion for thread spawning and affinity */
/* manipulation. */
struct task_struct *boost_kthread_task;

10
kernel/rcu/tree_plugin.h
View File

@ -1195,7 +1195,7 @@ static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp)
struct sched_param sp;
struct task_struct *t;
mutex_lock(&rnp->boost_kthread_mutex);
mutex_lock(&rnp->kthread_mutex);
if (rnp->boost_kthread_task || !rcu_scheduler_fully_active)
goto out;
@ -1212,7 +1212,7 @@ static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp)
wake_up_process(t); /* get to TASK_INTERRUPTIBLE quickly. */
out:
mutex_unlock(&rnp->boost_kthread_mutex);
mutex_unlock(&rnp->kthread_mutex);
}
/*
@ -1224,7 +1224,7 @@ static void rcu_spawn_one_boost_kthread(struct rcu_node *rnp)
* no outgoing CPU. If there are no CPUs left in the affinity set,
* this function allows the kthread to execute on any CPU.
*
* Any future concurrent calls are serialized via ->boost_kthread_mutex.
* Any future concurrent calls are serialized via ->kthread_mutex.
*/
static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu)
{
@ -1237,7 +1237,7 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu)
return;
if (!zalloc_cpumask_var(&cm, GFP_KERNEL))
return;
mutex_lock(&rnp->boost_kthread_mutex);
mutex_lock(&rnp->kthread_mutex);
mask = rcu_rnp_online_cpus(rnp);
for_each_leaf_node_possible_cpu(rnp, cpu)
if ((mask & leaf_node_cpu_bit(rnp, cpu)) &&
@ -1250,7 +1250,7 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu)
cpumask_clear_cpu(outgoingcpu, cm);
}
set_cpus_allowed_ptr(t, cm);
mutex_unlock(&rnp->boost_kthread_mutex);
mutex_unlock(&rnp->kthread_mutex);
free_cpumask_var(cm);
}