linux-kernel - Re: [RFC][PATCH 00/14 v2] function_graph: Rewrite to allow multiple users

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Date:   Sat, 8 Jun 2019 02:23:33 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Andy Lutomirski <luto@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        "Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [RFC][PATCH 00/14 v2] function_graph: Rewrite to allow multiple
 users

On Thu, 30 May 2019 18:29:20 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > OK, so this series isn't enough to allow kretprobes to use it yet. OK,
> > I plan on still keeping it because it does allow for placing function
> > graph tracer into instances with their own filters.  
> 
> OK, that will be a "regs" extension.
> > 
> > I'll look into adding a REGS flag like we do with ftrace_ops.
> > 
> > Does the return need all regs? Or is just the return code good enough?  
> 
> Since it depends on arch, I think all regs we need. And for the entry
> handler, we need all.

When I get back home, I'm going to push this series to linux-next. And
then I'll start adding the REGS extension for the next Linux release
after this series gets in.

Thanks for looking at it.

-- Steve