This is a note to let you know that I've just added the patch titled
tracing/osnoise: Fix notify new tracing_max_latency
to the 6.2-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
tracing-osnoise-fix-notify-new-tracing_max_latency.patch
and it can be found in the queue-6.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d3cba7f02cd82118c32651c73374d8a5a459d9a6 Mon Sep 17 00:00:00 2001
From: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Date: Wed, 29 Mar 2023 17:50:16 +0200
Subject: tracing/osnoise: Fix notify new tracing_max_latency
From: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
commit d3cba7f02cd82118c32651c73374d8a5a459d9a6 upstream.
osnoise/timerlat tracers are 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.
Link: https://lkml.kernel.org/r/ecd109fde4a0c24ab0f00ba1e9a144ac19a91322.1680104184.git.bristot@xxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Fixes: dae181349f1e ("tracing/osnoise: Support a list of trace_array *tr")
Signed-off-by: Daniel Bristot de Oliveira <bristot@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/trace/trace_osnoise.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1296,7 +1296,7 @@ static void notify_new_max_latency(u64 l
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);
}
Patches currently in stable-queue which might be from bristot@xxxxxxxxxx are
queue-6.2/tracing-osnoise-fix-notify-new-tracing_max_latency.patch
queue-6.2/tracing-timerlat-notify-new-max-thread-latency.patch
