The following commit has been merged into the core/rcu branch of tip: Commit-ID: 88092d0c99d7584d50cc8caadb8fa9ff8a1d4ea0 Gitweb: https://git.kernel.org/tip/88092d0c99d7584d50cc8caadb8fa9ff8a1d4ea0 Author: Paul E. McKenney <[email protected]> AuthorDate: Tue, 17 Mar 2020 08:57:02 -07:00 Committer: Paul E. McKenney <[email protected]> CommitterDate: Mon, 27 Apr 2020 11:03:52 -07:00
rcu-tasks: Add a grace-period start time for throttling and debug 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 <[email protected]> --- kernel/rcu/tasks.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 6f8a404..71462cf 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. */
