diff mbox series

[20/32] rcu-tasks: Add blocked-task indicator to RCU Tasks Trace stall warnings

Message ID 20220620225411.3842519-20-paulmck@kernel.org (mailing list archive)
State Mainlined
Commit 387c0ad702296c4eb7b95322c8af0e4391bf146f
Headers show
Series RCU Tasks updates for v5.20 | expand

Commit Message

Paul E. McKenney June 20, 2022, 10:53 p.m. UTC 
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>
---
 kernel/rcu/tasks.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index eb87a759ef0b0..6f4b89f9517ef 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],