Messages in this thread Patch in this message | | | From | "Paul E. McKenney" <> | Subject | [PATCH rcu 15/32] rcu-tasks: Make RCU Tasks Trace stall warnings print full .b.need_qs field | Date | Mon, 20 Jun 2022 15:53:54 -0700 |
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Currently, the RCU Tasks Trace CPU stall warning simply indicates whether or not the .b.need_qs field is zero. This commit shows the three permitted values and flags other values with either "!" or "?". 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> --- kernel/rcu/tasks.h | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 93096188d3631..5eefbab7f2edb 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1502,13 +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%s\n", + pr_alert("P%d: %c%c%c nesting: %d%c%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], + " !CN"[trc_rdr.needqs & 0x3], + " ?"[trc_rdr.needqs > 0x3], cpu, cpu_online(cpu) ? "" : "(offline)"); sched_show_task(t); } -- 2.31.1.189.g2e36527f23
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