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| author | Paul E. McKenney | 2023-06-02 14:38:44 -0700 |
|---|---|---|
| committer | Paul E. McKenney | 2023-07-14 15:01:49 -0700 |
| commit | 271a8467a5f7ab7654f06541d2483b5340bb7192 (patch) | |
| tree | 4566a21b09f59c3c118eade74aa0d5e1aed843a8 | |
| parent | 1d702e2eff8be1f39a1774f8a0f66f077b663b27 (diff) | |
rcuscale: Measure RCU Tasks Trace grace-period kthread CPU time
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>
| -rw-r--r-- | kernel/rcu/rcu.h | 3 | ||||
| -rw-r--r-- | kernel/rcu/rcuscale.c | 1 | ||||
| -rw-r--r-- | kernel/rcu/tasks.h | 6 |
3 files changed, 10 insertions, 0 deletions
diff --git a/kernel/rcu/rcu.h b/kernel/rcu/rcu.h index 98c1544cf572..d58bc0e86769 100644 --- a/kernel/rcu/rcu.h +++ b/kernel/rcu/rcu.h @@ -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 */ diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c index 7fba3ab66e35..35e06c86acc9 100644 --- a/kernel/rcu/rcuscale.c +++ b/kernel/rcu/rcuscale.c @@ -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" }; diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 990a6cf5fa35..0f03de023097 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -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 |