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rcu-tasks: Flag offline CPUs in RCU Tasks Trace stall warnings 

This commit tags offline CPUs with "(offline)" in RCU Tasks Trace CPU
stall warnings.  This is a debugging aid.

Signed-off-by: Paul 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>
This commit is contained in:
Paul E. McKenney 2022-05-24 20:36:08 -07:00
parent 9f3eb5fb8e
commit c8c03ad9d7
1 changed files with 2 additions and 2 deletions
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4
kernel/rcu/tasks.h
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@ -1502,14 +1502,14 @@ static void show_stalled_task_trace(struct task_struct *t, bool *firstreport)
".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",
pr_alert("P%d: %c%c%c nesting: %d%c cpu: %d%s\n",
t->pid,
".I"[trc_rdr.ipi_to_cpu >= 0],
".i"[is_idle_tsk],
".N"[cpu >= 0 && tick_nohz_full_cpu(cpu)],
trc_rdr.nesting,
" N"[!!trc_rdr.needqs],
cpu);
cpu, cpu_online(cpu) ? "" : "(offline)");
sched_show_task(t);
}