Commit-ID: 808de39cf422aa08dffd29510d841848ea18e215
Gitweb: http://git.kernel.org/tip/808de39cf422aa08dffd29510d841848ea18e215
Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
AuthorDate: Mon, 19 Jun 2017 10:03:22 -0700
Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
CommitDate: Mon, 24 Jul 2017 16:04:17 -0700
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: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>
---
kernel/rcu/rcutorture.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index b48d210..75ac749 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -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);
}
--
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