linux-kernel - Re: [PATCH v2 00/27] function_graph: Allow multiple users for function graph tracing

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Date: Sat, 1 Jun 2024 23:44:03 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mark Rutland
 <mark.rutland@....com>, 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 v2 00/27] function_graph: Allow multiple users for
 function graph tracing

On Sat, 01 Jun 2024 23:37:44 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> hanges since v1: https://lore.kernel.org/linux-trace-kernel/20240525023652.903909489@goodmis.org/
> 
> - Added ftrace helpers to allow an ftrace_ops to be a subop of a
>   managing ftrace_op. That is, the managing ftrace_op will enable
>   functions based off of the filters of the subops beneath it.
>   This could be extended for kprobes and fprobes, as the managing
>   ops does the multiplexing for the subops. This allows for only
>   adding a single callback to ftrace but have multiple ops that
>   represent many users.
> 
> - At the end, I added static branch which also speeds up the
>   code quite a bit.

Also added:

- A couple of kselftests.

-- Steve