linux-kernel - Re: [PATCH v3 3/5] selftests/resctrl: Split validate_resctrl_feature

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Message-ID: <imaqlenxrw3rfjlwlfnyhs4cc4cf2c7ibid7r7jeuqu5brsqdu@xpngruljfhrs>
Date: Wed, 31 Jan 2024 11:05:50 +0100
From: Maciej Wieczor-Retman <maciej.wieczor-retman@...el.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
CC: Reinette Chatre <reinette.chatre@...el.com>, <shuah@...nel.org>,
	<fenghua.yu@...el.com>, LKML <linux-kernel@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH v3 3/5] selftests/resctrl: Split
 validate_resctrl_feature_request()

Hi Ilpo,

On 2024-01-25 at 13:46:51 +0200, Ilpo Järvinen wrote:
>On Thu, 25 Jan 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 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  |  4 +--
>>  tools/testing/selftests/resctrl/mba_test.c  |  4 +--
>>  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, 30 insertions(+), 20 deletions(-)
>> 
>> diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
>> index dd5ca343c469..428de9df81c8 100644
>> --- a/tools/testing/selftests/resctrl/cmt_test.c
>> +++ b/tools/testing/selftests/resctrl/cmt_test.c
>> @@ -169,8 +169,8 @@ 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");
>> +	return resctrl_mon_feature_exists("llc_occupancy") &&
>> +	       resctrl_resource_exists("L3");
>>  }
>>  
>>  struct resctrl_test cmt_test = {
>> diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
>> index da256d2dbe5c..e22285b80e37 100644
>> --- a/tools/testing/selftests/resctrl/mba_test.c
>> +++ b/tools/testing/selftests/resctrl/mba_test.c
>> @@ -170,8 +170,8 @@ static int mba_run_test(const struct resctrl_test *test, const struct user_param
>>  
>>  static bool mba_feature_check(const struct resctrl_test *test)
>>  {
>> -	return test_resource_feature_check(test) &&
>> -	       validate_resctrl_feature_request("L3_MON", "mbm_local_bytes");
>> +	return resctrl_resource_exists(test->resource) &&
>
>I don't understand what's the advantage of converting away from 
>test_resource_feature_check() in CMT and MBA case?
>
>> +	       resctrl_mon_feature_exists("mbm_local_bytes");
>>  }
>
>> @@ -756,7 +765,7 @@ bool validate_resctrl_feature_request(const char *resource, const char *feature)
>>  
>>  bool test_resource_feature_check(const struct resctrl_test *test)
>>  {
>> -	return validate_resctrl_feature_request(test->resource, NULL);
>> +	return resctrl_resource_exists(test->resource);
>
>...The replacement in MBA open coded test_resource_feature_check() 100% 
>and CMT even replaces the test->resource with the string matching to 
>what's in test->resource?
>

You're right, I got carried away with refactoring a bit. I'll keep
test_resource_feature_check() for CMT and MBM. Thanks!

>
>-- 
> i.
>

-- 
Kind regards
Maciej Wieczór-Retman