linux-kernel - Re: [PATCH 3/5] selftests/resctrl: Remove duplicate codes that clear each test result file

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Date:   Thu, 22 Sep 2022 10:46:31 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Shuah Khan <shuah@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 3/5] selftests/resctrl: Remove duplicate codes that clear
 each test result file

Hi Shaopeng,

On 9/13/2022 6:51 PM, Shaopeng Tan wrote:
> Before exiting each test function(run_cmt/cat/mbm/mba_test()),
> test results are printed by ksft_print_msg() and then temporary result
> files are cleaned by function cmt/cat/mbm/mba_test_cleanup().
> However, before running ksft_print_msg(), function

before -> after?

> cmt/cat/mbm/mba_test_cleanup()
> has been run in each test function as follows:
>   cmt_resctrl_val()
>   cat_perf_miss_val()
>   mba_schemata_change()
>   mbm_bw_change()
> 
> Remove duplicate codes that clear each test result file.
> 

Another good catch, thank you.

> Signed-off-by: Shaopeng Tan <tan.shaopeng@...fujitsu.com>
> ---
>  tools/testing/selftests/resctrl/cat_test.c | 1 -
>  tools/testing/selftests/resctrl/cmt_test.c | 2 --
>  tools/testing/selftests/resctrl/mba_test.c | 2 --
>  tools/testing/selftests/resctrl/mbm_test.c | 2 --
>  4 files changed, 7 deletions(-)
> 
> diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
> index 1c5e90c63254..d1134f66469f 100644
> --- a/tools/testing/selftests/resctrl/cat_test.c
> +++ b/tools/testing/selftests/resctrl/cat_test.c
> @@ -221,7 +221,6 @@ int cat_perf_miss_val(int cpu_no, int n, char *cache_type)
>  		kill(bm_pid, SIGKILL);
>  	}
>  
> -	cat_test_cleanup();
>  	if (bm_pid)
>  		umount_resctrlfs();
>  

It makes it much easier to understand code if it is symmetrical. Since the files are
created within cat_perf_miss_val() I think it would be better to perform the cleanup
in the same function. So, keep this cleanup but remove the call from run_cat_test()
instead.

Similar for the cleanups below ... could you please keep them and instead
remove the duplicate cleanup from run_cmt/mbm/mba_test() instead?

When you do so, please be careful since it seems that there is (another!) bug where
the cleanup is not done if the test fails.

> diff --git a/tools/testing/selftests/resctrl/cmt_test.c b/tools/testing/selftests/resctrl/cmt_test.c
> index 8968e36db99d..b3b17fb876f4 100644
> --- a/tools/testing/selftests/resctrl/cmt_test.c
> +++ b/tools/testing/selftests/resctrl/cmt_test.c
> @@ -139,7 +139,5 @@ int cmt_resctrl_val(int cpu_no, int n, char **benchmark_cmd)
>  	if (ret)
>  		return ret;
>  
> -	cmt_test_cleanup();
> -
>  	return 0;
>  }
> diff --git a/tools/testing/selftests/resctrl/mba_test.c b/tools/testing/selftests/resctrl/mba_test.c
> index 1a1bdb6180cf..93ffacb416df 100644
> --- a/tools/testing/selftests/resctrl/mba_test.c
> +++ b/tools/testing/selftests/resctrl/mba_test.c
> @@ -166,7 +166,5 @@ int mba_schemata_change(int cpu_no, char *bw_report, char **benchmark_cmd)
>  	if (ret)
>  		return ret;
>  
> -	mba_test_cleanup();
> -
>  	return 0;
>  }
> diff --git a/tools/testing/selftests/resctrl/mbm_test.c b/tools/testing/selftests/resctrl/mbm_test.c
> index 38a3b3ad1c76..a453db4c221f 100644
> --- a/tools/testing/selftests/resctrl/mbm_test.c
> +++ b/tools/testing/selftests/resctrl/mbm_test.c
> @@ -134,7 +134,5 @@ int mbm_bw_change(int span, int cpu_no, char *bw_report, char **benchmark_cmd)
>  	if (ret)
>  		return ret;
>  
> -	mbm_test_cleanup();
> -
>  	return 0;
>  }

Thank you

Reinette