linux-kernel - Re: [PATCH] perf docu: Update section on cpu topology

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Message-ID: <20180528195412.GI25467@kernel.org>
Date:   Mon, 28 May 2018 16:54:12 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Thomas Richter <tmricht@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        brueckner@...ux.vnet.ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] perf docu: Update section on cpu topology

Em Mon, May 28, 2018 at 09:44:33AM +0200, Thomas Richter escreveu:
> Add an explanation of each cpu's core and socket
> identifier to the documentation.

Thanks, applying. I guess it is not that worth to mention that older
files may have just the string lists, right?

- Arnaldo
 
> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> ---
>  tools/perf/Documentation/perf.data-file-format.txt | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
> index d00f0d51cab8..c57904a526ce 100644
> --- a/tools/perf/Documentation/perf.data-file-format.txt
> +++ b/tools/perf/Documentation/perf.data-file-format.txt
> @@ -153,10 +153,18 @@ struct {
>  	HEADER_CPU_TOPOLOGY = 13,
>  
>  String lists defining the core and CPU threads topology.
> +The string lists are followed by a variable length array
> +which contains core_id and socket_id of each cpu.
> +The number of entries can be determined by the size of the
> +section minus the sizes of both string lists.
>  
>  struct {
>         struct perf_header_string_list cores; /* Variable length */
>         struct perf_header_string_list threads; /* Variable length */
> +       struct {
> +	      uint32_t core_id;
> +	      uint32_t socket_id;
> +       } cpus[nr]; /* Variable length records */
>  };
>  
>  Example:
> -- 
> 2.14.3