From 387c0ad702296c4eb7b95322c8af0e4391bf146f Mon Sep 17 00:00:00 2001 From: "Paul E. McKenney" Date: Tue, 17 May 2022 16:47:40 -0700 Subject: 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 Cc: Neeraj Upadhyay Cc: Eric Dumazet Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Martin KaFai Lau Cc: KP Singh --- kernel/rcu/tasks.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) 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], -- cgit v1.2.3