linux-kernel - Re: [PATCH 3/5] rtla/timerlat: Add --disable-idle-states for top

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Date: Fri, 21 Jun 2024 10:45:45 +0200
From: Daniel Bristot de Oliveira <bristot@...nel.org>
To: tglozar@...hat.com, rostedt@...dmis.org
Cc: linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
 jkacur@...hat.com, jwyatt@...hat.com
Subject: Re: [PATCH 3/5] rtla/timerlat: Add --disable-idle-states for top

On 6/12/24 16:54, tglozar@...hat.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