linux-kernel - Re: [PATCH v2 13/24] selftests/resctrl: Add flush_buffer() to fill

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Date:   Fri, 21 Apr 2023 17:16:40 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        <linux-kselftest@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        "Shuah Khan" <shuah@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     Shaopeng Tan <tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v2 13/24] selftests/resctrl: Add flush_buffer() to
 fill_buf

Hi Ilpo,

On 4/18/2023 4:44 AM, Ilpo Järvinen wrote:
> Currently, flushing is only done after allocating and filling the
> buffer and cannot be controlled by the test cases.
> 
> The new CAT test will want to control flushing within a test so
> introduce flush_buffer() for that purpose.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
> ---
>  tools/testing/selftests/resctrl/fill_buf.c | 5 +++++
>  tools/testing/selftests/resctrl/resctrl.h  | 1 +
>  2 files changed, 6 insertions(+)
> 
> diff --git a/tools/testing/selftests/resctrl/fill_buf.c b/tools/testing/selftests/resctrl/fill_buf.c
> index 677e1a113629..7e0d3a1ea555 100644
> --- a/tools/testing/selftests/resctrl/fill_buf.c
> +++ b/tools/testing/selftests/resctrl/fill_buf.c
> @@ -58,6 +58,11 @@ static void mem_flush(void *p, size_t s)
>  	sb();
>  }
>  
> +void flush_buffer(unsigned long long span)
> +{
> +	mem_flush(startptr, span);
> +}
> +

I do not think this indirection is needed. In the same spirit of feedback
to previous patches a test can manage its own buffer pointer
and flush it by calling mem_flush() directly.

Reinette