linux-kernel - Re: [PATCH v3 00/27] function_graph: Allow multiple users for function graph tracing

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Date: Wed, 5 Jun 2024 15:07:49 +0100
From: Mark Rutland <mark.rutland@....com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexei Starovoitov <alexei.starovoitov@...il.com>,
	Florent Revest <revest@...omium.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>, bpf <bpf@...r.kernel.org>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Alexei Starovoitov <ast@...nel.org>, Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Alan Maguire <alan.maguire@...cle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>, Guo Ren <guoren@...nel.org>
Subject: Re: [PATCH v3 00/27] function_graph: Allow multiple users for
 function graph tracing

On Mon, Jun 03, 2024 at 03:07:04PM -0400, Steven Rostedt wrote:
> This is a continuation of the function graph multi user code.
> I wrote a proof of concept back in 2019 of this code[1] and
> Masami started cleaning it up. I started from Masami's work v10
> that can be found here:
> 
>  https://lore.kernel.org/linux-trace-kernel/171509088006.162236.7227326999861366050.stgit@devnote2/
> 
> This is *only* the code that allows multiple users of function
> graph tracing. This is not the fprobe work that Masami is working
> to add on top of it. As Masami took my proof of concept, there
> was still several things I disliked about that code. Instead of
> having Masami clean it up even more, I decided to take over on just
> my code and change it up a bit.

FWIW, this is useful to me as-is for testing stacktracing.

Before this series I had some horrid hacks to manipulate the global
filters, and after this series I just need to manipulate the filters in
fgraph_ops::ops, which is *much* nicer.

I've pushed out my WIP to:

  https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/log/?h=stacktrace/tests

... which is all to say, this is useful and I've given this some testing
beyond the usual ftrace tests.

Mark.