linux-kernel - Re: [PATCH v1 2/2] perf docs: Add documentation for --force-btf option

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z0YCCFRPahESJqfm@x1>
Date: Tue, 26 Nov 2024 14:14:48 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Howard Chu <howardchu95@...il.com>
Cc: peterz@...radead.org, mingo@...hat.com, namhyung@...nel.org,
	mark.rutland@....com, alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
	kan.liang@...ux.intel.com, linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] perf docs: Add documentation for --force-btf
 option

On Fri, Nov 22, 2024 at 04:55:11PM -0800, Howard Chu wrote:
> The --force-btf option is intended for debugging purposes and is
> currently undocumented. Add documentation for it.
> 
> Signed-off-by: Howard Chu <howardchu95@...il.com>
> ---
>  tools/perf/Documentation/perf-trace.txt | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
> index 6e0cc50bbc13..529081599cc7 100644
> --- a/tools/perf/Documentation/perf-trace.txt
> +++ b/tools/perf/Documentation/perf-trace.txt
> @@ -241,6 +241,9 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
>  	printing using the existing 'perf trace' syscall arg beautifiers to map integer
>  	arguments to strings (pid to comm, syscall id to syscall name, etc).
>  
> +--force-btf::
> +	Use btf_dump to pretty print syscall argument data, instead of using hand-crafted pretty printers.
> +

I think here we could expand a bit and explain that we want this for
testing the BTF code, and also mention that the hand-crafted pretty
printers know about integers -> strings, how to pretty print flags, etc
that BTF doesn't.

- Arnaldo

>  
>  PAGEFAULTS
>  ----------
> -- 
> 2.43.0