linux-kernel - Re: [PATCH v4 3/5] selftests/resctrl: Split validate_resctrl_feature

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Date: Mon, 5 Feb 2024 14:41:30 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
cc: fenghua.yu@...el.com, Reinette Chatre <reinette.chatre@...el.com>, 
    shuah@...nel.org, linux-kselftest@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3/5] selftests/resctrl: Split
 validate_resctrl_feature_request()

On Mon, 5 Feb 2024, Maciej Wieczor-Retman wrote:

> validate_resctrl_feature_request() is used to test both if a resource is
> present in the info directory, and if a passed monitoring feature is
> present in the mon_features file.
> 
> Refactor validate_resctrl_feature_request() into two smaller functions
> that each accomplish one check to give feature checking more
> granularity:
> - Resource directory presence in the /sys/fs/resctrl/info directory.
> - Feature name presence in the /sys/fs/resctrl/info/L3_MON/mon_features
>   file.
> 
> Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
> ---
> Changelog v4:
> - Roll back to using test_resource_feature_check() for CMT and MBA.
>   (Ilpo).
> 
> Changelog v3:
> - Move new function to a separate patch. (Reinette)
> - Rewrite resctrl_mon_feature_exists() only for L3_MON.
> 
> Changelog v2:
> - Add this patch.
> 
>  tools/testing/selftests/resctrl/cmt_test.c  |  2 +-
>  tools/testing/selftests/resctrl/mba_test.c  |  2 +-
>  tools/testing/selftests/resctrl/mbm_test.c  |  6 ++--
>  tools/testing/selftests/resctrl/resctrl.h   |  3 +-
>  tools/testing/selftests/resctrl/resctrlfs.c | 33 +++++++++++++--------
>  5 files changed, 28 insertions(+), 18 deletions(-)
> 

> diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
> index dd5ca343c469..c1157917a814 100644
> --- a/tools/testing/selftests/resctrl/cmt_test.c
> +++ b/tools/testing/selftests/resctrl/cmt_test.c
> @@ -170,7 +170,7 @@ static int cmt_run_test(const struct resctrl_test *test, const struct user_param
>  static bool cmt_feature_check(const struct resctrl_test *test)
>  {
>  	return test_resource_feature_check(test) &&
> -	       validate_resctrl_feature_request("L3_MON", "llc_occupancy");
> +	       resctrl_resource_exists("L3");

This not correctly transformed.

> +/*
> + * resctrl_mon_feature_exists - Check if requested monitoring L3_MON feature 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 *feature)
> +{
> +	char *res;
> +	FILE *inf;
> +
>  	if (!feature)
> -		return true;
> +		return false;
>  
> -	snprintf(res_path, sizeof(res_path), "%s/%s/mon_features", INFO_PATH, resource);
> -	inf = fopen(res_path, "r");
> +	inf = fopen("/sys/fs/resctrl/info/L3_MON/mon_features", "r");

This became less generic? Could there be other MON resource besides L3 
one? Perhaps there aren't today but why remove the ability give it as a 
parameter?


-- 
 i.