linux-kernel - [PATCH] tracing/osnoise: Fix notify new tracing_max

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Message-Id: <c22302a7db3cee6bcabf87462ed22a35dd38690f.1679675521.git.bristot@kernel.org>
Date:   Fri, 24 Mar 2023 18:51:35 +0100
From:   Daniel Bristot de Oliveira <bristot@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Daniel Bristot de Oliveira <bristot@...nel.org>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: [PATCH] tracing/osnoise: Fix notify new tracing_max_latency

timerlat is not reporting a new tracing_max_latency for the thread
latency. Also, the tracer is reporting new max latency on instances
where the tracing is off, creating inconsistencies between the max
reported values in the trace and in the tracing_max_latency. Thus
only report new tracing_max_latency on active tracing instances.

Fixes: dae181349f1e ("tracing/osnoise: Support a list of trace_array *tr")
Cc: Daniel Bristot de Oliveira <bristot@...nel.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
---
 kernel/trace/trace_osnoise.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 210e1f168392..2a1b337ac643 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1296,7 +1296,7 @@ static void notify_new_max_latency(u64 latency)
 	rcu_read_lock();
 	list_for_each_entry_rcu(inst, &osnoise_instances, list) {
 		tr = inst->tr;
-		if (tr->max_latency < latency) {
+		if (tracer_tracing_is_on(tr) && tr->max_latency < latency) {
 			tr->max_latency = latency;
 			latency_fsnotify(tr);
 		}
@@ -1738,6 +1738,8 @@ static int timerlat_main(void *data)
 
 		trace_timerlat_sample(&s);
 
+		notify_new_max_latency(diff);
+
 		timerlat_dump_stack(time_to_us(diff));
 
 		tlat->tracing_thread = false;
-- 
2.38.1