linux-kernel - Re: [PATCH v4 4/5] selftests/resctrl: Add resource_info_file

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Message-ID: <17fd1cd7-6b52-4c5a-af6d-2a2c0973cc58@intel.com>
Date: Mon, 5 Feb 2024 20:17:48 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>,
	<fenghua.yu@...el.com>, <shuah@...nel.org>
CC: <linux-kselftest@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH v4 4/5] selftests/resctrl: Add resource_info_file_exists()

Hi Maciej,

On 2/5/2024 4:08 AM, Maciej Wieczor-Retman wrote:
> Feature checking done by resctrl_mon_feature_exists() covers features
> represented by the feature name presence inside the 'mon_features' file
> in /sys/fs/resctrl/info/L3_MON directory. There exists a different way
> to represent feature support and that is by the presence of 0 or 1 in a
> single file in the info/resource directory. In this case the filename
> represents what feature support is being indicated.
> 
> Add a generic function to check file presence in the
> /sys/fs/resctrl/info/<RESOURCE> directory.
> 
> Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
> Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---
> Changelog v4:
> - Remove unnecessary new lines.
> - Change 'feature' -> 'file' to keep things generic. (Reinette)
> - Add Ilpo's reviewed-by tag.
> 
> Changelog v3:
> - Split off the new function into this patch. (Reinette)
> 
> Changelog v2:
> - Add this patch.
> 
>  tools/testing/selftests/resctrl/resctrl.h   |  1 +
>  tools/testing/selftests/resctrl/resctrlfs.c | 25 +++++++++++++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
> index 4603b215b97e..2b9a3d0570c7 100644
> --- a/tools/testing/selftests/resctrl/resctrl.h
> +++ b/tools/testing/selftests/resctrl/resctrl.h
> @@ -138,6 +138,7 @@ int umount_resctrlfs(void);
>  int validate_bw_report_request(char *bw_report);
>  bool resctrl_resource_exists(const char *resource);
>  bool resctrl_mon_feature_exists(const char *feature);
> +bool resource_info_file_exists(const char *resource, const char *feature);

One stray "feature" usage.

>  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 0cfec8bb23fd..6a3082ca58b5 100644
> --- a/tools/testing/selftests/resctrl/resctrlfs.c
> +++ b/tools/testing/selftests/resctrl/resctrlfs.c
> @@ -760,6 +760,31 @@ bool resctrl_mon_feature_exists(const char *feature)
>  	return !!res;
>  }
>  
> +/*
> + * resource_info_file_exists - Check if a file is present inside
> + * /sys/fs/resctrl/info/RESOURCE.
> + * @resource:	Required resource (Eg: MB, L3, L2, etc.)
> + * @file:	Required file.
> + *
> + * Return: True if the file exists, else false.

How about "True if /sys/fs/resctrl/info/@...ource/@...e exists, else false"?

Reinette