Commit 05b72465 authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcutorture: Increase visibility of forward-progress hangs 



This commit adds a few pr_alert() calls to rcutorture's forward-progress
testing in order to better diagnose shutdown-time hangs.

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 2b4a7f20

kernel/rcu/rcutorture.c

+4 −0
Original line number Diff line number Diff line
@@ -2281,6 +2281,7 @@ static void rcu_torture_fwd_prog_nr(struct rcu_fwd *rfp, 
	unsigned long stopat;

	static DEFINE_TORTURE_RANDOM(trs);



	pr_alert("%s: Starting forward-progress test %d\n", __func__, rfp->rcu_fwd_id);

	if (!cur_ops->sync)

		return; // Cannot do need_resched() forward progress testing without ->sync.

	if (cur_ops->call && cur_ops->cb_barrier) {
@@ -2325,6 +2326,7 @@ static void rcu_torture_fwd_prog_nr(struct rcu_fwd *rfp, 
	if (selfpropcb) {

		WRITE_ONCE(fcs.stop, 1);

		cur_ops->sync(); /* Wait for running CB to complete. */

		pr_alert("%s: Waiting for CBs: %pS() %d\n", __func__, cur_ops->cb_barrier, rfp->rcu_fwd_id);

		cur_ops->cb_barrier(); /* Wait for queued callbacks. */

	}
@@ -2353,6 +2355,7 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp) 
	unsigned long stopat;

	unsigned long stoppedat;



	pr_alert("%s: Starting forward-progress test %d\n", __func__, rfp->rcu_fwd_id);

	if (READ_ONCE(rcu_fwd_emergency_stop))

		return; /* Get out of the way quickly, no GP wait! */

	if (!cur_ops->call)
@@ -2414,6 +2417,7 @@ static void rcu_torture_fwd_prog_cr(struct rcu_fwd *rfp) 
	n_launders_cb_snap = READ_ONCE(rfp->n_launders_cb);

	cver = READ_ONCE(rcu_torture_current_version) - cver;

	gps = rcutorture_seq_diff(cur_ops->get_gp_seq(), gps);

	pr_alert("%s: Waiting for CBs: %pS() %d\n", __func__, cur_ops->cb_barrier, rfp->rcu_fwd_id);

	cur_ops->cb_barrier(); /* Wait for callbacks to be invoked. */

	(void)rcu_torture_fwd_prog_cbfree(rfp);