linux-kernel - [for-next][PATCH 06/14] rtla/timerlat_top: Abort event processing on second signal

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Message-ID: <20250124184857.222577823@goodmis.org>
Date: Fri, 24 Jan 2025 13:48:41 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Tomas Glozar <tglozar@...hat.com>,
 John Kacur <jkacur@...hat.com>,
 Luis Goncalves <lgoncalv@...hat.com>,
 Gabriele Monaco <gmonaco@...hat.com>
Subject: [for-next][PATCH 06/14] rtla/timerlat_top: Abort event processing on second signal

From: Tomas Glozar <tglozar@...hat.com>

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@...hat.com>
Cc: Luis Goncalves <lgoncalv@...hat.com>
Cc: Gabriele Monaco <gmonaco@...hat.com>
Link: https://lore.kernel.org/20250116144931.649593-6-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@...hat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 tools/tracing/rtla/src/timerlat_top.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index d21a21053917..d358cd39f360 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -903,6 +903,14 @@ 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);
-- 
2.45.2