Commit 47199a08 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu: Add diagnostics for rcutorture writer stall warning 



This commit adds any in-the-future ->gp_seq_needed fields to the
diagnostics for an rcutorture writer stall warning message.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent cd23ac8d

kernel/rcu/tree.c

+21 −0
Original line number Diff line number Diff line
@@ -606,11 +606,32 @@ EXPORT_SYMBOL_GPL(rcu_sched_force_quiescent_state); 
 */

void show_rcu_gp_kthreads(void)

{

	int cpu;

	struct rcu_data *rdp;

	struct rcu_node *rnp;

	struct rcu_state *rsp;



	for_each_rcu_flavor(rsp) {

		pr_info("%s: wait state: %d ->state: %#lx\n",

			rsp->name, rsp->gp_state, rsp->gp_kthread->state);

		rcu_for_each_node_breadth_first(rsp, rnp) {

			if (ULONG_CMP_GE(rsp->gp_seq, rnp->gp_seq_needed))

				continue;

			pr_info("\trcu_node %d:%d ->gp_seq %lu ->gp_seq_needed %lu\n",

				rnp->grplo, rnp->grphi, rnp->gp_seq,

				rnp->gp_seq_needed);

			if (!rcu_is_leaf_node(rnp))

				continue;

			for_each_leaf_node_possible_cpu(rnp, cpu) {

				rdp = per_cpu_ptr(rsp->rda, cpu);

				if (rdp->gpwrap ||

				    ULONG_CMP_GE(rsp->gp_seq,

						 rdp->gp_seq_needed))

					continue;

				pr_info("\tcpu %d ->gp_seq_needed %lu\n",

					cpu, rdp->gp_seq_needed);

			}

		}

		/* sched_show_task(rsp->gp_kthread); */

	}

}