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| author | Paul E. McKenney <paulmck@kernel.org> | 2023-05-17 05:01:28 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2023-07-14 15:01:49 -0700 |
| commit | 5f8e3202696f5e94d3fc54cfed75d270ae843ee9 (patch) | |
| tree | a902e3236e84fa24cc07c15b26196d4635adbf58 /kernel/rcu/tasks.h | |
| parent | bb7bad3dae42b669cfe471716f0073ac611e7f75 (diff) | |
| download | lwn-5f8e3202696f5e94d3fc54cfed75d270ae843ee9.tar.gz lwn-5f8e3202696f5e94d3fc54cfed75d270ae843ee9.zip | |
rcuscale: Measure grace-period kthread CPU time
This commit adds the ability to output the CPU time consumed by the
grace-period kthread for the RCU variant under test. 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 feedback from Stephen Rothwell and kernel test robot. ]
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Tested-by: Yujie Liu <yujie.liu@intel.com>
Diffstat (limited to 'kernel/rcu/tasks.h')
| -rw-r--r-- | kernel/rcu/tasks.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index b770add3f843..990a6cf5fa35 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1830,6 +1830,12 @@ void show_rcu_tasks_trace_gp_kthread(void) EXPORT_SYMBOL_GPL(show_rcu_tasks_trace_gp_kthread); #endif // !defined(CONFIG_TINY_RCU) +struct task_struct *get_rcu_tasks_trace_gp_kthread(void) +{ + return rcu_tasks_trace.kthread_ptr; +} +EXPORT_SYMBOL_GPL(get_rcu_tasks_trace_gp_kthread); + #else /* #ifdef CONFIG_TASKS_TRACE_RCU */ static void exit_tasks_rcu_finish_trace(struct task_struct *t) { } #endif /* #else #ifdef CONFIG_TASKS_TRACE_RCU */ |