linux-kernel - Re: [PATCH] perf/docu: Update header documentation on BPF_PROG

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Message-ID: <aJ-ZrlaDDbvY_wbi@google.com>
Date: Fri, 15 Aug 2025 13:33:50 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Thomas Richter <tmricht@...ux.ibm.com>
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux-perf-users@...r.kernel.org, acme@...nel.org,
	agordeev@...ux.ibm.com, gor@...ux.ibm.com, sumanthk@...ux.ibm.com,
	hca@...ux.ibm.com, japo@...ux.ibm.com
Subject: Re: [PATCH] perf/docu: Update header documentation on BPF_PROG_INFO

Hello,

On Tue, Aug 05, 2025 at 11:03:49AM +0200, Thomas Richter wrote:
> Update the perf.data file format description on header
> section HEADER_BPF_PROG_INFO.
> The information is taken from process_bpf_prog_info()
> and write_bpf_prog_info() from file util/header.c.
> 
> Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
> Acked-by: Sumanth Korikkar <sumanthk@...ux.ibm.com>
> Reviewed-by: Jan Polensky <japo@...ux.ibm.com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung

> ---
>  tools/perf/Documentation/perf.data-file-format.txt | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
> index cd95ba09f727..0437eb5d9188 100644
> --- a/tools/perf/Documentation/perf.data-file-format.txt
> +++ b/tools/perf/Documentation/perf.data-file-format.txt
> @@ -348,6 +348,16 @@ to special needs.
>  
>  struct perf_bpil, which contains detailed information about
>  a BPF program, including type, id, tag, jited/xlated instructions, etc.
> +The format of data in HEADER_BPF_PROG_INFO is as follows:
> +	u32 count
> +
> +	struct perf_bpil {
> +		u32 info_len;	/* size of struct bpf_prog_info, when the tool is compiled */
> +		u32 data_len;	/* total bytes allocated for data, round up to 8 bytes */
> +		u64 arrays;	/* which arrays are included in data */
> +		struct bpf_prog_info info;
> +		u8  data[];
> +	}[count];
>  
>          HEADER_BPF_BTF = 26,
>  
> -- 
> 2.48.1
>