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rcuscale: Measure RCU Tasks Trace grace-period kthread CPU time

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This commit causes RCU Tasks Trace to output the CPU time consumed by
its grace-period kthread.  The CPU time is whatever is in the designated
task's current->stime field, and thus is controlled by whatever CPU-time
accounting scheme is in effect.

This output appears in microseconds as follows on the console:

rcu_scale: Grace-period kthread CPU time: 42367.037

[ paulmck: Apply Willy Tarreau feedback. ]

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Paul E. McKenney 2023-06-02 14:38:44 -07:00
parent 1d702e2eff
commit 271a8467a5
3 changed files with 10 additions and 0 deletions
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3
kernel/rcu/rcu.h
View file

@ -505,6 +505,9 @@ void rcu_async_relax(void);
void rcupdate_announce_bootup_oddness(void);
#ifdef CONFIG_TASKS_RCU_GENERIC
void show_rcu_tasks_gp_kthreads(void);
# ifdef CONFIG_TASKS_RCU
struct task_struct *get_rcu_tasks_gp_kthread(void);
# endif // # ifdef CONFIG_TASKS_RCU
#else /* #ifdef CONFIG_TASKS_RCU_GENERIC */
static inline void show_rcu_tasks_gp_kthreads(void) {}
#endif /* #else #ifdef CONFIG_TASKS_RCU_GENERIC */

1
kernel/rcu/rcuscale.c
View file

@ -298,6 +298,7 @@ static struct rcu_scale_ops tasks_ops = {
.gp_barrier = rcu_barrier_tasks,
.sync = synchronize_rcu_tasks,
.exp_sync = synchronize_rcu_tasks,
.rso_gp_kthread = get_rcu_tasks_gp_kthread,
.name = "tasks"
};

6
kernel/rcu/tasks.h
View file

@ -1042,6 +1042,12 @@ void show_rcu_tasks_classic_gp_kthread(void)
EXPORT_SYMBOL_GPL(show_rcu_tasks_classic_gp_kthread);
#endif // !defined(CONFIG_TINY_RCU)
struct task_struct *get_rcu_tasks_gp_kthread(void)
{
return rcu_tasks.kthread_ptr;
}
EXPORT_SYMBOL_GPL(get_rcu_tasks_gp_kthread);
/*
* Contribute to protect against tasklist scan blind spot while the
* task is exiting and may be removed from the tasklist. See