linux-kernel - Re: [PATCH 4/4] selftests/resctrl: Skip the tests if iMC/UMC counters are unavailable

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Message-ID: <a13f6e21-9929-a16d-bda1-533eaed8f875@linux.intel.com>
Date: Fri, 23 Feb 2024 12:56:04 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Babu Moger <babu.moger@....com>
cc: fenghua.yu@...el.com, Reinette Chatre <reinette.chatre@...el.com>, 
    shuah@...nel.org, LKML <linux-kernel@...r.kernel.org>, 
    linux-kselftest@...r.kernel.org, 
    Maciej Wieczór-Retman <maciej.wieczor-retman@...el.com>, 
    peternewman@...gle.com, eranian@...gle.com
Subject: Re: [PATCH 4/4] selftests/resctrl: Skip the tests if iMC/UMC counters
 are unavailable

On Thu, 22 Feb 2024, Babu Moger wrote:

> Older systems do not support UMC (Unified Memory Controller) perf counters.
> Skip the tests if the system does not support UMC counters.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---
>  tools/testing/selftests/resctrl/resctrl.h       |  1 +
>  tools/testing/selftests/resctrl/resctrl_tests.c | 10 ++++++++++
>  tools/testing/selftests/resctrl/resctrl_val.c   |  4 ++--
>  3 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/resctrl/resctrl.h b/tools/testing/selftests/resctrl/resctrl.h
> index a33f414f6019..5c2556af0649 100644
> --- a/tools/testing/selftests/resctrl/resctrl.h
> +++ b/tools/testing/selftests/resctrl/resctrl.h
> @@ -116,5 +116,6 @@ int show_cache_info(unsigned long sum_llc_val, int no_of_bits,
>  		    size_t cache_span, unsigned long max_diff,
>  		    unsigned long max_diff_percent, unsigned long num_of_runs,
>  		    bool platform, bool cmt);
> +int get_number_of_mem_ctrls(void);
>  
>  #endif /* RESCTRL_H */
> diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
> index 231233b8d354..5423882529ec 100644
> --- a/tools/testing/selftests/resctrl/resctrl_tests.c
> +++ b/tools/testing/selftests/resctrl/resctrl_tests.c
> @@ -98,6 +98,11 @@ static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
>  
>  	ksft_print_msg("Starting MBM BW change ...\n");
>  
> +	if (get_number_of_mem_ctrls() < 0) {
> +		ksft_test_result_skip("Unable find iMC/UMC counters!\n");
> +		return;
> +	}
> +
>  	if (test_prepare()) {
>  		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
>  		return;
> @@ -124,6 +129,11 @@ static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
>  
>  	ksft_print_msg("Starting MBA Schemata change ...\n");
>  
> +	if (get_number_of_mem_ctrls() < 0) {
> +		ksft_test_result_skip("Unable find iMC/UMC counters!\n");
> +		return;
> +	}
> +
>  	if (test_prepare()) {
>  		ksft_exit_fail_msg("Abnormal failure when preparing for the test\n");
>  		return;

This also needs rebasing and adaptation to the generic test framework.

-- 
 i.