[PATCH 3/5] rtla/timerlat_top: Stop timerlat tracer on signal
From: Tomas Glozar <tglozar@redhat.com>
Date: 2025-01-16 14:50:07
Also in:
lkml
Subsystem:
real-time linux analysis (rtla) tools, the rest · Maintainers:
Steven Rostedt, Tomas Glozar, Linus Torvalds
Apply the changes from the previous patch also to timerlat-top.
Cc: stable@vger.kernel.org
Fixes: a828cd18bc4a ("rtla: Add timerlat tool and timelart top mode")
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
---
tools/tracing/rtla/src/timerlat_top.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index 059b468981e4..d21a21053917 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c@@ -900,9 +900,12 @@ static struct osnoise_tool } static int stop_tracing; +static struct trace_instance *top_inst = NULL; static void stop_top(int sig) { stop_tracing = 1; + if (top_inst) + trace_instance_stop(top_inst); } /*
@@ -950,6 +953,13 @@ int timerlat_top_main(int argc, char *argv[]) } trace = &top->trace; + /* + * Save trace instance into global variable so that SIGINT can stop + * the timerlat tracer. + * Otherwise, rtla could loop indefinitely when overloaded. + */ + top_inst = trace; + retval = enable_timerlat(trace); if (retval) {
@@ -1131,7 +1141,7 @@ int timerlat_top_main(int argc, char *argv[]) return_value = 0; - if (trace_is_off(&top->trace, &record->trace)) { + if (trace_is_off(&top->trace, &record->trace) && !stop_tracing) { printf("rtla timerlat hit stop tracing\n"); if (!params->no_aa)
--
2.47.1