linux-kernel - Re: [PATCH v4 09/19] selftests/resctrl: Convert span to size

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Date:   Thu, 13 Jul 2023 15:59:49 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        <linux-kselftest@...r.kernel.org>, Shuah Khan <shuah@...nel.org>,
        "Shaopeng Tan" <tan.shaopeng@...fujitsu.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 09/19] selftests/resctrl: Convert span to size_t

Hi Ilpo,

On 7/13/2023 6:19 AM, Ilpo Järvinen wrote:

...

> @@ -188,10 +188,10 @@ fill_cache(unsigned long long buf_size, int malloc_and_init, int memflush,
>  	return 0;
>  }
>  
> -int run_fill_buf(unsigned long span, int malloc_and_init_memory,
> -		 int memflush, int op, char *resctrl_val)
> +int run_fill_buf(size_t span, int malloc_and_init_memory, int memflush, int op,
> +		 char *resctrl_val)
>  {
> -	unsigned long long cache_size = span;
> +	size_t cache_size = span;
>  	int ret;
>  
>  	ret = fill_cache(cache_size, malloc_and_init_memory, memflush, op,

Any idea what the purpose being run_fill_buf() is? From what I can tell it is
an unnecessary level of indirection.

...

> diff --git a/tools/testing/selftests/resctrl/resctrlfs.c b/tools/testing/selftests/resctrl/resctrlfs.c
> index f622245adafe..8be5b745226d 100644
> --- a/tools/testing/selftests/resctrl/resctrlfs.c
> +++ b/tools/testing/selftests/resctrl/resctrlfs.c
> @@ -298,7 +298,7 @@ int taskset_benchmark(pid_t bm_pid, int cpu_no)
>  void run_benchmark(int signum, siginfo_t *info, void *ucontext)
>  {
>  	int operation, ret, malloc_and_init_memory, memflush;
> -	unsigned long span, buffer_span;
> +	size_t span, buffer_span;
>  	char **benchmark_cmd;
>  	char resctrl_val[64];
>  	FILE *fp;

Do we now need a cast in the initialization of span?

Reinette