From e11c9c8365cd7655e81c4e6611492f1b15850aa5 Mon Sep 17 00:00:00 2001 From: Crystal Wood Date: Mon, 11 May 2026 17:31:43 -0500 Subject: [PATCH] tracing/osnoise: Dump stack on timerlat uret threshold event Dump the saved IRQ stack trace regardless of whether the event was THREAD_CONTEXT or THREAD_URET. In the uret case, the latency presumably had not yet crossed the threshold at IRQ time (or else it would have dumped the stack at thread wakeup time, unless we're racing with a change to the threshold), but it may have at least contributed -- and this is possible with THREAD_CONTEXT as well. In any case, it helps with writing reliable rtla tests if we always get a stack trace on a threshold event. Cc: John Kacur Cc: Tomas Glozar Cc: Costa Shulyupin Cc: Wander Lairson Costa Link: https://patch.msgid.link/20260511223143.1477332-1-crwood@redhat.com Signed-off-by: Crystal Wood Signed-off-by: Steven Rostedt --- kernel/trace/trace_osnoise.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c index 75678053b21c..62c2667d97fa 100644 --- a/kernel/trace/trace_osnoise.c +++ b/kernel/trace/trace_osnoise.c @@ -2544,9 +2544,12 @@ timerlat_fd_read(struct file *file, char __user *ubuf, size_t count, notify_new_max_latency(diff); tlat->tracing_thread = false; - if (osnoise_data.stop_tracing_total) - if (time_to_us(diff) >= osnoise_data.stop_tracing_total) + if (osnoise_data.stop_tracing_total) { + if (time_to_us(diff) >= osnoise_data.stop_tracing_total) { + timerlat_dump_stack(time_to_us(diff)); osnoise_stop_tracing(); + } + } } else { tlat->tracing_thread = false; tlat->kthread = current;