Commit 9f3eb5fb authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

rcu-tasks: Add slow-IPI indicator to RCU Tasks Trace stall warnings 



This commit adds a "I" indicator to the RCU Tasks Trace CPU stall
warning when an IPI directed to a task has thus far failed to arrive.
This serves as a debugging aid.

Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Cc: Neeraj Upadhyay <quic_neeraju@quicinc.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: KP Singh <kpsingh@kernel.org>
parent 0968e892

kernel/rcu/tasks.h

+2 −1
Original line number Diff line number Diff line
@@ -1497,8 +1497,9 @@ static void show_stalled_task_trace(struct task_struct *t, bool *firstreport) 
	}

	cpu = task_cpu(t);

	if (!task_call_func(t, trc_check_slow_task, &trc_rdr))

		pr_alert("P%d: %c\n",

		pr_alert("P%d: %c%c\n",

			 t->pid,

			 ".I"[t->trc_ipi_to_cpu >= 0],

			 ".i"[is_idle_tsk]);

	else

		pr_alert("P%d: %c%c%c nesting: %d%c cpu: %d\n",