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Commit 808de39c authored by Paul E. McKenney's avatar Paul E. McKenney
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rcutorture: Add task's CPU for rcutorture writer stalls 



It appears that at least some of the rcutorture writer stall messages
coincide with unusually long CPU-online operations, for example, no
fewer than 205 seconds in a recent test.  It is of course possible that
the writer stall is not unrelated to this unusually long CPU-hotplug
operation, and so this commit adds the rcutorture writer task's CPU to
the stall message to gain more information about this possible connection.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent c234ee4b

kernel/rcu/rcutorture.c

+3 −2
Original line number Diff line number Diff line
@@ -1319,11 +1319,12 @@ rcu_torture_stats_print(void) 
		srcutorture_get_gp_data(cur_ops->ttype, srcu_ctlp,

					&flags, &gpnum, &completed);

		wtp = READ_ONCE(writer_task);

		pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx\n",

		pr_alert("??? Writer stall state %s(%d) g%lu c%lu f%#x ->state %#lx cpu %d\n",

			 rcu_torture_writer_state_getname(),

			 rcu_torture_writer_state,

			 gpnum, completed, flags,

			 wtp == NULL ? ~0UL : wtp->state);

			 wtp == NULL ? ~0UL : wtp->state,

			 wtp == NULL ? -1 : (int)task_cpu(wtp));

		show_rcu_gp_kthreads();

		rcu_ftrace_dump(DUMP_ALL);

	}