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| author | Paul E. McKenney <paulmck@kernel.org> | 2022-05-17 16:47:40 -0700 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-06-20 09:22:29 -0700 |
| commit | 387c0ad702296c4eb7b95322c8af0e4391bf146f (patch) | |
| tree | d99bce30468a0e922384e24414509e9f8e086b43 | |
| parent | 0bcb386857376224b5fd3f38b6e3173ec74d8d36 (diff) | |
| download | lwn-387c0ad702296c4eb7b95322c8af0e4391bf146f.tar.gz lwn-387c0ad702296c4eb7b95322c8af0e4391bf146f.zip | |
rcu-tasks: Add blocked-task indicator to RCU Tasks Trace stall warnings
This commit adds a "B" indicator to the RCU Tasks Trace CPU stall warning
when the task has blocked within its current read-side critical section.
This serves as 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>
| -rw-r--r-- | kernel/rcu/tasks.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index eb87a759ef0b..6f4b89f9517e 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -1536,11 +1536,12 @@ 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%c cpu: %d%s\n", + pr_alert("P%d: %c%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)], + ".B"[!!data_race(t->trc_reader_special.b.blocked)], trc_rdr.nesting, " !CN"[trc_rdr.needqs & 0x3], " ?"[trc_rdr.needqs > 0x3], |