This is a note to let you know that I've just added the patch titled
rtla/timerlat_top: Abort event processing on second signal
to the 6.13-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:
rtla-timerlat_top-abort-event-processing-on-second-s.patch
and it can be found in the queue-6.13 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e9c1c9fb7ed2f5d9804ef7b8a74ecd45ee57209c
Author: Tomas Glozar <tglozar@xxxxxxxxxx>
Date: Thu Jan 16 15:49:31 2025 +0100
rtla/timerlat_top: Abort event processing on second signal
[ Upstream commit 80967b354a76b360943af384c10d807d98bea5c4 ]
If either SIGINT is received twice, or after a SIGALRM (that is, after
timerlat was supposed to stop), abort processing events currently left
in the tracefs buffer and exit immediately.
This allows the user to exit rtla without waiting for processing all
events, should that take longer than wanted, at the cost of not
processing all samples.
Cc: John Kacur <jkacur@xxxxxxxxxx>
Cc: Luis Goncalves <lgoncalv@xxxxxxxxxx>
Cc: Gabriele Monaco <gmonaco@xxxxxxxxxx>
Link: https://lore.kernel.org/20250116144931.649593-6-tglozar@xxxxxxxxxx
Signed-off-by: Tomas Glozar <tglozar@xxxxxxxxxx>
Signed-off-by: Steven Rostedt (Google) <rostedt@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index 139eb58336c36..f387597d3ac22 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -906,6 +906,14 @@ static int stop_tracing;
static struct trace_instance *top_inst = NULL;
static void stop_top(int sig)
{
+ if (stop_tracing) {
+ /*
+ * Stop requested twice in a row; abort event processing and
+ * exit immediately
+ */
+ tracefs_iterate_stop(top_inst->inst);
+ return;
+ }
stop_tracing = 1;
if (top_inst)
trace_instance_stop(top_inst);
