Merge tag 'trace-tools-v6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

Pull tracing tools updates from Steven Rostedt:

 - Add auto-analysis only option to rtla/timerlat

   Add an --aa-only option to the tooling to perform only the auto
   analysis and not to parse and format the data.

 - Other minor fixes and clean ups

* tag 'trace-tools-v6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  rtla/timerlat: Fix "Previous IRQ" auto analysis' line
  rtla/timerlat: Add auto-analysis only option
  rv: Remove redundant assignment to variable retval
  rv: Fix addition on an uninitialized variable 'run'
  rtla: Add .gitignore file

Author: torvalds

Documentation/tools/rtla/common_timerlat_aa.rst

@@ -5,3 +5,10 @@
 **--no-aa**
 
         disable auto-analysis, reducing rtla timerlat cpu usage
+
+**--aa-only** *us*
+
+        Set stop tracing conditions and run without collecting and displaying statistics.
+        Print the auto-analysis if the system hits the stop tracing condition. This option
+        is useful to reduce rtla timerlat CPU, enabling the debug without the overhead of
+        collecting the statistics.

kernel/trace/rv/rv.c

@@ -290,8 +290,6 @@ static ssize_t monitor_enable_write_data(struct file *filp, const char __user *u
 	if (retval)
 		return retval;
 
-	retval = count;
-
 	mutex_lock(&rv_interface_lock);
 
 	if (val)

tools/tracing/rtla/.gitignore

@@ -0,0 +1 @@
+/rtla

tools/tracing/rtla/src/timerlat_aa.c

@@ -548,7 +548,7 @@ static void timerlat_thread_analysis(struct timerlat_aa_data *taa_data, int cpu,
 	exp_irq_ts = taa_data->timer_irq_start_time - taa_data->timer_irq_start_delay;
 
 	if (exp_irq_ts < taa_data->prev_irq_timstamp + taa_data->prev_irq_duration)
-		printf("  Previous IRQ interference:	\t	up to %9.2f us",
+		printf("  Previous IRQ interference:	\t\t up to  %9.2f us\n",
 			ns_to_usf(taa_data->prev_irq_duration));
 
 	/*

tools/tracing/rtla/src/timerlat_top.c

@@ -33,6 +33,7 @@ struct timerlat_top_params {
 	int			set_sched;
 	int			dma_latency;
 	int			no_aa;
+	int			aa_only;
 	int			dump_tasks;
 	struct sched_attr	sched_param;
 	struct trace_events	*events;
@@ -142,10 +143,12 @@ timerlat_top_handler(struct trace_seq *s, struct tep_record *record,
 	top = container_of(trace, struct osnoise_tool, trace);
 	params = top->params;
 
-	tep_get_field_val(s, event, "context", record, &thread, 1);
-	tep_get_field_val(s, event, "timer_latency", record, &latency, 1);
+	if (!params->aa_only) {
+		tep_get_field_val(s, event, "context", record, &thread, 1);
+		tep_get_field_val(s, event, "timer_latency", record, &latency, 1);
 
-	timerlat_top_update(top, cpu, thread, latency);
+		timerlat_top_update(top, cpu, thread, latency);
+	}
 
 	if (!params->no_aa)
 		timerlat_aa_handler(s, record, event, context);
@@ -250,6 +253,9 @@ timerlat_print_stats(struct timerlat_top_params *params, struct osnoise_tool *to
 	static int nr_cpus = -1;
 	int i;
 
+	if (params->aa_only)
+		return;
+
 	if (nr_cpus == -1)
 		nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
 
@@ -279,10 +285,11 @@ static void timerlat_top_usage(char *usage)
 		"",
 		"  usage: rtla timerlat [top] [-h] [-q] [-a us] [-d s] [-D] [-n] [-p us] [-i us] [-T us] [-s us] \\",
 		"	  [[-t[=file]] [-e sys[:event]] [--filter <filter>] [--trigger <trigger>] [-c cpu-list] \\",
-		"	  [-P priority] [--dma-latency us]",
+		"	  [-P priority] [--dma-latency us] [--aa-only us]",
 		"",
 		"	  -h/--help: print this menu",
 		"	  -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit",
+		"	     --aa-only us: stop if <us> latency is hit, only printing the auto analysis (reduces CPU usage)",
 		"	  -p/--period us: timerlat period in us",
 		"	  -i/--irq us: stop trace if the irq latency is higher than the argument in us",
 		"	  -T/--thread us: stop trace if the thread latency is higher than the argument in us",
@@ -362,13 +369,14 @@ static struct timerlat_top_params
 			{"dma-latency",		required_argument,	0, '2'},
 			{"no-aa",		no_argument,		0, '3'},
 			{"dump-tasks",		no_argument,		0, '4'},
+			{"aa-only",		required_argument,	0, '5'},
 			{0, 0, 0, 0}
 		};
 
 		/* getopt_long stores the option index here. */
 		int option_index = 0;
 
-		c = getopt_long(argc, argv, "a:c:d:De:hi:np:P:qs:t::T:0:1:2:34",
+		c = getopt_long(argc, argv, "a:c:d:De:hi:np:P:qs:t::T:0:1:2:345:",
 				 long_options, &option_index);
 
 		/* detect the end of the options. */
@@ -389,6 +397,20 @@ static struct timerlat_top_params
 			/* set trace */
 			params->trace_output = "timerlat_trace.txt";
 			break;
+		case '5':
+			/* it is here because it is similar to -a */
+			auto_thresh = get_llong_from_str(optarg);
+
+			/* set thread stop to auto_thresh */
+			params->stop_total_us = auto_thresh;
+			params->stop_us = auto_thresh;
+
+			/* get stack trace */
+			params->print_stack = auto_thresh;
+
+			/* set aa_only to avoid parsing the trace */
+			params->aa_only = 1;
+			break;
 		case 'c':
 			retval = parse_cpu_list(optarg, &params->monitored_cpus);
 			if (retval)
@@ -503,6 +525,9 @@ static struct timerlat_top_params
 	if (!params->stop_us && !params->stop_total_us)
 		params->no_aa = 1;
 
+	if (params->no_aa && params->aa_only)
+		timerlat_top_usage("--no-aa and --aa-only are mutually exclusive!");
+
 	return params;
 }
 
@@ -634,6 +659,7 @@ int timerlat_top_main(int argc, char *argv[])
 	struct trace_instance *trace;
 	int dma_latency_fd = -1;
 	int return_value = 1;
+	char *max_lat;
 	int retval;
 
 	params = timerlat_top_parse_args(argc, argv);
@@ -700,6 +726,9 @@ int timerlat_top_main(int argc, char *argv[])
 	while (!stop_tracing) {
 		sleep(params->sleep_time);
 
+		if (params->aa_only && !trace_is_off(&top->trace, &record->trace))
+			continue;
+
 		retval = tracefs_iterate_raw_events(trace->tep,
 						    trace->inst,
 						    NULL,
@@ -733,6 +762,16 @@ int timerlat_top_main(int argc, char *argv[])
 			printf("  Saving trace to %s\n", params->trace_output);
 			save_trace_to_file(record->trace.inst, params->trace_output);
 		}
+	} else if (params->aa_only) {
+		/*
+		 * If the trace did not stop with --aa-only, at least print the
+		 * max known latency.
+		 */
+		max_lat = tracefs_instance_file_read(trace->inst, "tracing_max_latency", NULL);
+		if (max_lat) {
+			printf("  Max latency was %s\n", max_lat);
+			free(max_lat);
+		}
 	}
 
 out_top:

tools/verification/rv/src/rv.c

@@ -74,7 +74,7 @@ static void rv_list(int argc, char **argv)
 static void rv_mon(int argc, char **argv)
 {
 	char *monitor_name;
-	int i, run;
+	int i, run = 0;
 
 	static const char *const usage[] = {
 		"",