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| author | Paul E. McKenney <paulmck@kernel.org> | 2024-08-01 17:34:24 -0700 |
|---|---|---|
| committer | Neeraj Upadhyay <neeraj.upadhyay@kernel.org> | 2024-08-14 16:49:56 +0530 |
| commit | d3f84aeb71d61ece24164bb2ce3161c60922fd8c (patch) | |
| tree | ded226a23350d9f20cb14de67b08428a47d1a694 /kernel/rcu | |
| parent | 54973cdd166b13195a99940cd21a827c3a99cac2 (diff) | |
rcu/tasks: Mark callbacks not currently participating in barrier operation
Each Tasks RCU flavor keeps a count of the number of callbacks that the
current rcu_barrier_tasks*() is waiting on, but there is currently no
easy way to work out which callback is stuck. One way to do this is to
mark idle RCU-barrier callbacks by making the ->next pointer point to
the callback itself, and this commit does just that.
Later commits will use this for debug output.
Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
Diffstat (limited to 'kernel/rcu')
| -rw-r--r-- | kernel/rcu/tasks.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 127018280618..d44abcd656d6 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -283,6 +283,7 @@ static void cblist_init_generic(struct rcu_tasks *rtp) INIT_LIST_HEAD(&rtpcp->rtp_blkd_tasks); if (!rtpcp->rtp_exit_list.next) INIT_LIST_HEAD(&rtpcp->rtp_exit_list); + rtpcp->barrier_q_head.next = &rtpcp->barrier_q_head; maxcpu = cpu; } @@ -407,6 +408,7 @@ static void rcu_barrier_tasks_generic_cb(struct rcu_head *rhp) struct rcu_tasks *rtp; struct rcu_tasks_percpu *rtpcp; + rhp->next = rhp; // Mark the callback as having been invoked. rtpcp = container_of(rhp, struct rcu_tasks_percpu, barrier_q_head); rtp = rtpcp->rtpp; if (atomic_dec_and_test(&rtp->barrier_q_count)) |