diff mbox series

[3/5] rtla/timerlat: Add --disable-idle-states for top

Message ID 20240612145439.206990-4-tglozar@redhat.com (mailing list archive)
State Superseded
Headers show
Series rtla: Support idle state disabling via libcpupower in timerlat | expand

Commit Message

Tomas Glozar June 12, 2024, 2:54 p.m. UTC 
From: Tomas Glozar <tglozar@redhat.com>

Add option to disable idle states on CPUs where timerlat is running for
the duration of the workload.

Signed-off-by: Tomas Glozar <tglozar@redhat.com>
---
 tools/tracing/rtla/src/timerlat_top.c | 35 ++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

Comments

Daniel Bristot de Oliveira June 21, 2024, 8:45 a.m. UTC | #1 
On 6/12/24 16:54, tglozar@redhat.com wrote:
> @@ -550,6 +555,7 @@ static struct timerlat_top_params
>  			{"aa-only",		required_argument,	0, '5'},
>  			{"warm-up",		required_argument,	0, '6'},
>  			{"trace-buffer-size",	required_argument,	0, '7'},
> +			{"disable-idle-states",	no_argument,		0, '8'},

Can we add an argument with a state level to set?

>  			{0, 0, 0, 0}
>  		};
>  
> @@ -726,6 +732,9 @@ static struct timerlat_top_params
>  		case '7':
>  			params->buffer_size = get_llong_from_str(optarg);
>  			break;
> +		case '8':
> +			params->disable_idle_states = 1;
> +			break;
>  		default:
>  			timerlat_top_usage("Invalid option");
>  		}
> @@ -922,6 +931,7 @@ int timerlat_top_main(int argc, char *argv[])
>  	int return_value = 1;
>  	char *max_lat;
>  	int retval;
> +	int i;
>  
>  	params = timerlat_top_parse_args(argc, argv);
>  	if (!params)
> @@ -971,6 +981,21 @@ int timerlat_top_main(int argc, char *argv[])
>  		}
>  	}
>  
> +	if (params->disable_idle_states) {
> +		for (i = 0; i < sysconf(_SC_NPROCESSORS_CONF); i++) {
> +			if (params->cpus && !CPU_ISSET(i, &params->monitored_cpus))
> +				continue;
> +			if (save_cpu_idle_disable_state(i) < 0) {
> +				err_msg("Could not save cpu idle state.\n");
> +				goto out_free;
> +			}
> +			if (set_cpu_idle_disable_state(i, 1) < 0) {

and use the argument state here?                                    ^

-- Daniel
diff mbox series

Patch

diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c
index 8c16419fe22a..dd1e5b03d781 100644
--- a/tools/tracing/rtla/src/timerlat_top.c
+++ b/tools/tracing/rtla/src/timerlat_top.c
@@ -48,6 +48,7 @@  struct timerlat_top_params {
 	int			pretty_output;
 	int			warmup;
 	int			buffer_size;
+	int			disable_idle_states;
 	cpu_set_t		hk_cpu_set;
 	struct sched_attr	sched_param;
 	struct trace_events	*events;
@@ -447,7 +448,7 @@  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] [-H cpu-list]\\",
-		"	  [-P priority] [--dma-latency us] [--aa-only us] [-C[=cgroup_name]] [-u|-k] [--warm-up s]",
+		"	  [-P priority] [--dma-latency us] [--aa-only us] [-C[=cgroup_name]] [-u|-k] [--warm-up s] [--disable-idle-states]",
 		"",
 		"	  -h/--help: print this menu",
 		"	  -a/--auto: set automatic trace mode, stopping the session if argument in us latency is hit",
@@ -481,6 +482,7 @@  static void timerlat_top_usage(char *usage)
 		"	  -U/--user-load: enable timerlat for user-defined user-space workload",
 		"	     --warm-up s: let the workload run for s seconds before collecting data",
 		"	     --trace-buffer-size kB: set the per-cpu trace buffer size in kB",
+		"	     --disable-idle-states: disable all idle states for cpus used by timerlat to reduce exit from idle latency",
 		NULL,
 	};
 
@@ -518,6 +520,9 @@  static struct timerlat_top_params
 	/* disabled by default */
 	params->dma_latency = -1;
 
+	/* disabled by default */
+	params->disable_idle_states = 0;
+
 	/* display data in microseconds */
 	params->output_divisor = 1000;
 
@@ -550,6 +555,7 @@  static struct timerlat_top_params
 			{"aa-only",		required_argument,	0, '5'},
 			{"warm-up",		required_argument,	0, '6'},
 			{"trace-buffer-size",	required_argument,	0, '7'},
+			{"disable-idle-states",	no_argument,		0, '8'},
 			{0, 0, 0, 0}
 		};
 
@@ -726,6 +732,9 @@  static struct timerlat_top_params
 		case '7':
 			params->buffer_size = get_llong_from_str(optarg);
 			break;
+		case '8':
+			params->disable_idle_states = 1;
+			break;
 		default:
 			timerlat_top_usage("Invalid option");
 		}
@@ -922,6 +931,7 @@  int timerlat_top_main(int argc, char *argv[])
 	int return_value = 1;
 	char *max_lat;
 	int retval;
+	int i;
 
 	params = timerlat_top_parse_args(argc, argv);
 	if (!params)
@@ -971,6 +981,21 @@  int timerlat_top_main(int argc, char *argv[])
 		}
 	}
 
+	if (params->disable_idle_states) {
+		for (i = 0; i < sysconf(_SC_NPROCESSORS_CONF); i++) {
+			if (params->cpus && !CPU_ISSET(i, &params->monitored_cpus))
+				continue;
+			if (save_cpu_idle_disable_state(i) < 0) {
+				err_msg("Could not save cpu idle state.\n");
+				goto out_free;
+			}
+			if (set_cpu_idle_disable_state(i, 1) < 0) {
+				err_msg("Could not disable cpu idle state.\n");
+				goto out_free;
+			}
+		}
+	}
+
 	if (params->trace_output) {
 		record = osnoise_init_trace_tool("timerlat");
 		if (!record) {
@@ -1125,6 +1150,13 @@  int timerlat_top_main(int argc, char *argv[])
 	timerlat_aa_destroy();
 	if (dma_latency_fd >= 0)
 		close(dma_latency_fd);
+	if (params->disable_idle_states) {
+		for (i = 0; i < sysconf(_SC_NPROCESSORS_CONF); i++) {
+			if (params->cpus && !CPU_ISSET(i, &params->monitored_cpus))
+				continue;
+			restore_cpu_idle_disable_state(i);
+		}
+	}
 	trace_events_destroy(&record->trace, params->events);
 	params->events = NULL;
 out_free:
@@ -1134,6 +1166,7 @@  int timerlat_top_main(int argc, char *argv[])
 	osnoise_destroy_tool(record);
 	osnoise_destroy_tool(top);
 	free(params);
+	free_cpu_idle_disable_states();
 out_exit:
 	exit(return_value);
 }