rtla: Change monitored_cpus from char * to cpu_set_t

Use a cpumask instead of a char *, reducing memory footprint and code.

No functional change, and in preparation for auto house-keeping.

Link: https://lkml.kernel.org/r/54c46293261d13cb1042d0314486539eeb45fe5d.1686066600.git.bristot@kernel.org

Cc: William White <chwhite@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Tested-by: Juri Lelli <juri.lelli@redhat.com>
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

tools/tracing/rtla/src/osnoise_hist.c

@@ -19,7 +19,7 @@
 
 struct osnoise_hist_params {
 	char			*cpus;
-	char			*monitored_cpus;
+	cpu_set_t		monitored_cpus;
 	char			*trace_output;
 	char			*cgroup_name;
 	unsigned long long	runtime;
@@ -274,7 +274,7 @@ static void osnoise_hist_header(struct osnoise_tool *tool)
 		trace_seq_printf(s, "Index");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].count)
@@ -305,7 +305,7 @@ osnoise_print_summary(struct osnoise_hist_params *params,
 		trace_seq_printf(trace->seq, "count:");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].count)
@@ -319,7 +319,7 @@ osnoise_print_summary(struct osnoise_hist_params *params,
 		trace_seq_printf(trace->seq, "min:  ");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].count)
@@ -334,7 +334,7 @@ osnoise_print_summary(struct osnoise_hist_params *params,
 		trace_seq_printf(trace->seq, "avg:  ");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].count)
@@ -352,7 +352,7 @@ osnoise_print_summary(struct osnoise_hist_params *params,
 		trace_seq_printf(trace->seq, "max:  ");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].count)
@@ -387,7 +387,7 @@ osnoise_print_stats(struct osnoise_hist_params *params, struct osnoise_tool *too
 					 bucket * data->bucket_size);
 
 		for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-			if (params->cpus && !params->monitored_cpus[cpu])
+			if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 				continue;
 
 			if (!data->hist[cpu].count)
@@ -411,7 +411,7 @@ osnoise_print_stats(struct osnoise_hist_params *params, struct osnoise_tool *too
 		trace_seq_printf(trace->seq, "over: ");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].count)
@@ -559,7 +559,7 @@ static struct osnoise_hist_params
 				osnoise_hist_usage("Bucket size needs to be > 0 and <= 1000000\n");
 			break;
 		case 'c':
-			retval = parse_cpu_list(optarg, &params->monitored_cpus);
+			retval = parse_cpu_set(optarg, &params->monitored_cpus);
 			if (retval)
 				osnoise_hist_usage("\nInvalid -c cpu list\n");
 			params->cpus = optarg;

tools/tracing/rtla/src/osnoise_top.c

@@ -26,7 +26,7 @@ enum osnoise_mode {
  */
 struct osnoise_top_params {
 	char			*cpus;
-	char			*monitored_cpus;
+	cpu_set_t		monitored_cpus;
 	char			*trace_output;
 	char			*cgroup_name;
 	unsigned long long	runtime;
@@ -263,7 +263,7 @@ osnoise_print_stats(struct osnoise_top_params *params, struct osnoise_tool *top)
 	osnoise_top_header(top);
 
 	for (i = 0; i < nr_cpus; i++) {
-		if (params->cpus && !params->monitored_cpus[i])
+		if (params->cpus && !CPU_ISSET(i, &params->monitored_cpus))
 			continue;
 		osnoise_top_print(top, i);
 	}
@@ -397,7 +397,7 @@ struct osnoise_top_params *osnoise_top_parse_args(int argc, char **argv)
 
 			break;
 		case 'c':
-			retval = parse_cpu_list(optarg, &params->monitored_cpus);
+			retval = parse_cpu_set(optarg, &params->monitored_cpus);
 			if (retval)
 				osnoise_top_usage(params, "\nInvalid -c cpu list\n");
 			params->cpus = optarg;

tools/tracing/rtla/src/timerlat_hist.c

@@ -19,7 +19,7 @@
 
 struct timerlat_hist_params {
 	char			*cpus;
-	char			*monitored_cpus;
+	cpu_set_t		monitored_cpus;
 	char			*trace_output;
 	char			*cgroup_name;
 	unsigned long long	runtime;
@@ -227,7 +227,7 @@ static void timerlat_hist_header(struct osnoise_tool *tool)
 		trace_seq_printf(s, "Index");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
@@ -263,7 +263,7 @@ timerlat_print_summary(struct timerlat_hist_params *params,
 		trace_seq_printf(trace->seq, "count:");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
@@ -283,7 +283,7 @@ timerlat_print_summary(struct timerlat_hist_params *params,
 		trace_seq_printf(trace->seq, "min:  ");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
@@ -303,7 +303,7 @@ timerlat_print_summary(struct timerlat_hist_params *params,
 		trace_seq_printf(trace->seq, "avg:  ");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
@@ -331,7 +331,7 @@ timerlat_print_summary(struct timerlat_hist_params *params,
 		trace_seq_printf(trace->seq, "max:  ");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
@@ -371,7 +371,7 @@ timerlat_print_stats(struct timerlat_hist_params *params, struct osnoise_tool *t
 					 bucket * data->bucket_size);
 
 		for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-			if (params->cpus && !params->monitored_cpus[cpu])
+			if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 				continue;
 
 			if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
@@ -405,7 +405,7 @@ timerlat_print_stats(struct timerlat_hist_params *params, struct osnoise_tool *t
 		trace_seq_printf(trace->seq, "over: ");
 
 	for (cpu = 0; cpu < data->nr_cpus; cpu++) {
-		if (params->cpus && !params->monitored_cpus[cpu])
+		if (params->cpus && !CPU_ISSET(cpu, &params->monitored_cpus))
 			continue;
 
 		if (!data->hist[cpu].irq_count && !data->hist[cpu].thread_count)
@@ -565,7 +565,7 @@ static struct timerlat_hist_params
 
 			break;
 		case 'c':
-			retval = parse_cpu_list(optarg, &params->monitored_cpus);
+			retval = parse_cpu_set(optarg, &params->monitored_cpus);
 			if (retval)
 				timerlat_hist_usage("\nInvalid -c cpu list\n");
 			params->cpus = optarg;

tools/tracing/rtla/src/timerlat_top.c

@@ -21,7 +21,7 @@
 
 struct timerlat_top_params {
 	char			*cpus;
-	char			*monitored_cpus;
+	cpu_set_t		monitored_cpus;
 	char			*trace_output;
 	char			*cgroup_name;
 	unsigned long long	runtime;
@@ -271,7 +271,7 @@ timerlat_print_stats(struct timerlat_top_params *params, struct osnoise_tool *to
 	timerlat_top_header(top);
 
 	for (i = 0; i < nr_cpus; i++) {
-		if (params->cpus && !params->monitored_cpus[i])
+		if (params->cpus && !CPU_ISSET(i, &params->monitored_cpus))
 			continue;
 		timerlat_top_print(top, i);
 	}
@@ -422,7 +422,7 @@ static struct timerlat_top_params
 			params->aa_only = 1;
 			break;
 		case 'c':
-			retval = parse_cpu_list(optarg, &params->monitored_cpus);
+			retval = parse_cpu_set(optarg, &params->monitored_cpus);
 			if (retval)
 				timerlat_top_usage("\nInvalid -c cpu list\n");
 			params->cpus = optarg;

tools/tracing/rtla/src/utils.c

@@ -88,69 +88,6 @@ void get_duration(time_t start_time, char *output, int output_size)
 			tm_info->tm_sec);
 }
 
-/*
- * parse_cpu_list - parse a cpu_list filling a char vector with cpus set
- *
- * Receives a cpu list, like 1-3,5 (cpus 1, 2, 3, 5), and then set the char
- * in the monitored_cpus.
- *
- * XXX: convert to a bitmask.
- */
-int parse_cpu_list(char *cpu_list, char **monitored_cpus)
-{
-	char *mon_cpus;
-	const char *p;
-	int end_cpu;
-	int nr_cpus;
-	int cpu;
-	int i;
-
-	nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
-
-	mon_cpus = calloc(nr_cpus, sizeof(char));
-	if (!mon_cpus)
-		goto err;
-
-	for (p = cpu_list; *p; ) {
-		cpu = atoi(p);
-		if (cpu < 0 || (!cpu && *p != '0') || cpu >= nr_cpus)
-			goto err;
-
-		while (isdigit(*p))
-			p++;
-		if (*p == '-') {
-			p++;
-			end_cpu = atoi(p);
-			if (end_cpu < cpu || (!end_cpu && *p != '0') || end_cpu >= nr_cpus)
-				goto err;
-			while (isdigit(*p))
-				p++;
-		} else
-			end_cpu = cpu;
-
-		if (cpu == end_cpu) {
-			debug_msg("cpu_list: adding cpu %d\n", cpu);
-			mon_cpus[cpu] = 1;
-		} else {
-			for (i = cpu; i <= end_cpu; i++) {
-				debug_msg("cpu_list: adding cpu %d\n", i);
-				mon_cpus[i] = 1;
-			}
-		}
-
-		if (*p == ',')
-			p++;
-	}
-
-	*monitored_cpus = mon_cpus;
-
-	return 0;
-
-err:
-	debug_msg("Error parsing the cpu list %s", cpu_list);
-	return 1;
-}
-
 /*
  * parse_cpu_set - parse a cpu_list filling cpu_set_t argument
  *