linux-kernel - Re: [PATCH v5 3/5] selftests/resctrl: Split validate_resctrl_feature

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Date: Fri, 9 Feb 2024 09:20:27 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	<shuah@...nel.org>, <fenghua.yu@...el.com>
CC: <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH v5 3/5] selftests/resctrl: Split
 validate_resctrl_feature_request()

Hi Maciej,

On 2/9/2024 6:01 AM, Maciej Wieczor-Retman wrote:

..

> diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
> index 5116ea082d03..f434a6543b4f 100644
> --- a/tools/testing/selftests/resctrl/resctrl.h
> +++ b/tools/testing/selftests/resctrl/resctrl.h
> @@ -136,7 +136,9 @@ int get_domain_id(const char *resource, int cpu_no, int *domain_id);
>  int mount_resctrlfs(void);
>  int umount_resctrlfs(void);
>  int validate_bw_report_request(char *bw_report);
> -bool validate_resctrl_feature_request(const char *resource, const char *feature);
> +bool resctrl_resource_exists(const char *resource);
> +bool resctrl_mon_feature_exists(const char *resource, const char *feature);
> +bool resource_info_file_exists(const char *resource, const char *file);

Portion of next patch sneaked in here.

>  bool test_resource_feature_check(const struct resctrl_test *test);
>  char *fgrep(FILE *inf, const char *str);
>  int taskset_benchmark(pid_t bm_pid, int cpu_no, cpu_set_t *old_affinity);
> diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
> index 8a183c73bc23..af4f800ab23d 100644
> --- a/tools/testing/selftests/resctrl/resctrlfs.c
> +++ b/tools/testing/selftests/resctrl/resctrlfs.c
> @@ -708,20 +708,16 @@ char *fgrep(FILE *inf, const char *str)
>  }
>  
>  /*
> - * validate_resctrl_feature_request - Check if requested feature is valid.
> - * @resource:	Required resource (e.g., MB, L3, L2, L3_MON, etc.)
> - * @feature:	Required monitor feature (in mon_features file). Can only be
> - *		set for L3_MON. Must be NULL for all other resources.
> + * resctrl_resource_exists - Check if a resource is supported.
> + * @resource:	Resctrl resource (e.g., MB, L3, L2, L3_MON, etc.)
>   *
> - * Return: True if the resource/feature is supported, else false. False is
> + * Return: True if the resource is supported, else false. False is
>   *         also returned if resctrl FS is not mounted.
>   */
> -bool validate_resctrl_feature_request(const char *resource, const char *feature)
> +bool resctrl_resource_exists(const char *resource)
>  {
>  	char res_path[PATH_MAX];
>  	struct stat statbuf;
> -	char *res;
> -	FILE *inf;
>  	int ret;
>  
>  	if (!resource)
> @@ -736,8 +732,25 @@ bool validate_resctrl_feature_request(const char *resource, const char *feature)
>  	if (stat(res_path, &statbuf))
>  		return false;
>  
> +	return true;
> +}
> +
> +/*
> + * resctrl_mon_feature_exists - Check if requested monitoring feature is valid.
> + * @resource:	Resource that uses the mon_features file. Currently only L3_MON
> + *		is valid.
> + * @feature:	Required monitor feature (in mon_features file).
> + *
> + * Return: True if the feature is supported, else false.
> + */
> +bool resctrl_mon_feature_exists(const char *resource, const char *feature)
> +{
> +	char res_path[PATH_MAX];
> +	char *res;
> +	FILE *inf;
> +
>  	if (!feature)

Now that resource is a new parameter should it be checked also? It is not obvious
why only one parameter is checked.

Reinette