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rcu-tasks: Use unique names for RCU-Tasks kthreads and messages 

This commit causes the flavors of RCU Tasks to use different names
for their kthreads and in their console messages.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2020-03-03 15:50:31 -08:00
parent 3d6e43c75d
commit c97d12a63c
1 changed files with 16 additions and 9 deletions
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25
kernel/rcu/tasks.h
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@ -22,6 +22,8 @@ typedef void (*rcu_tasks_gp_func_t)(struct rcu_tasks *rtp);
* @kthread_ptr: This flavor's grace-period/callback-invocation kthread.
* @gp_func: This flavor's grace-period-wait function.
* @call_func: This flavor's call_rcu()-equivalent function.
* @name: This flavor's textual name.
* @kname: This flavor's kthread name.
*/
struct rcu_tasks {
struct rcu_head *cbs_head;
@ -31,16 +33,20 @@ struct rcu_tasks {
struct task_struct *kthread_ptr;
rcu_tasks_gp_func_t gp_func;
call_rcu_func_t call_func;
char *name;
char *kname;
};
#define DEFINE_RCU_TASKS(name, gp, call) \
static struct rcu_tasks name = \
#define DEFINE_RCU_TASKS(rt_name, gp, call, n) \
static struct rcu_tasks rt_name = \
{ \
.cbs_tail = &name.cbs_head, \
.cbs_wq = __WAIT_QUEUE_HEAD_INITIALIZER(name.cbs_wq), \
.cbs_lock = __RAW_SPIN_LOCK_UNLOCKED(name.cbs_lock), \
.cbs_tail = &rt_name.cbs_head, \
.cbs_wq = __WAIT_QUEUE_HEAD_INITIALIZER(rt_name.cbs_wq), \
.cbs_lock = __RAW_SPIN_LOCK_UNLOCKED(rt_name.cbs_lock), \
.gp_func = gp, \
.call_func = call, \
.name = n, \
.kname = #rt_name, \
}
/* Track exiting tasks in order to allow them to be waited for. */
@ -145,8 +151,8 @@ static void __init rcu_spawn_tasks_kthread_generic(struct rcu_tasks *rtp)
{
struct task_struct *t;
t = kthread_run(rcu_tasks_kthread, rtp, "rcu_tasks_kthread");
if (WARN_ONCE(IS_ERR(t), "%s: Could not start Tasks-RCU grace-period kthread, OOM is now expected behavior\n", __func__))
t = kthread_run(rcu_tasks_kthread, rtp, "%s_kthread", rtp->kname);
if (WARN_ONCE(IS_ERR(t), "%s: Could not start %s grace-period kthread, OOM is now expected behavior\n", __func__, rtp->name))
return;
smp_mb(); /* Ensure others see full kthread. */
}
@ -342,7 +348,7 @@ static void rcu_tasks_wait_gp(struct rcu_tasks *rtp)
}
void call_rcu_tasks(struct rcu_head *rhp, rcu_callback_t func);
DEFINE_RCU_TASKS(rcu_tasks, rcu_tasks_wait_gp, call_rcu_tasks);
DEFINE_RCU_TASKS(rcu_tasks, rcu_tasks_wait_gp, call_rcu_tasks, "RCU Tasks");
/**
* call_rcu_tasks() - Queue an RCU for invocation task-based grace period
@ -437,7 +443,8 @@ static void rcu_tasks_rude_wait_gp(struct rcu_tasks *rtp)
}
void call_rcu_tasks_rude(struct rcu_head *rhp, rcu_callback_t func);
DEFINE_RCU_TASKS(rcu_tasks_rude, rcu_tasks_rude_wait_gp, call_rcu_tasks_rude);
DEFINE_RCU_TASKS(rcu_tasks_rude, rcu_tasks_rude_wait_gp, call_rcu_tasks_rude,
"RCU Tasks Rude");
/**
* call_rcu_tasks_rude() - Queue a callback rude task-based grace period