| From | paulmck@kernel ... | Subject | [PATCH v3 tip/core/rcu 21/34] rcu-tasks: Add a grace-period start time for throttling and debug | Date | Fri, 27 Mar 2020 15:24:43 -0700 |
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From: "Paul E. McKenney" <paulmck@kernel.org>
This commit adds a place to record the grace-period start in jiffies. This will be used by later commits for debugging purposes and to throttle IPIs early in the grace period.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org> --- kernel/rcu/tasks.h | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index cbc9905..fa9c069 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -46,6 +46,7 @@ struct rcu_tasks { raw_spinlock_t cbs_lock; int gp_state; unsigned long gp_jiffies; + unsigned long gp_start; struct task_struct *kthread_ptr; rcu_tasks_gp_func_t gp_func; pregp_func_t pregp_func; @@ -200,6 +201,7 @@ static int __noreturn rcu_tasks_kthread(void *arg) // Wait for one grace period. set_tasks_gp_state(rtp, RTGS_WAIT_GP); + rtp->gp_start = jiffies; rtp->gp_func(rtp); /* Invoke the callbacks. */ -- 2.9.5
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