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Date:   Wed, 22 May 2019 10:40:27 -0400
From:   Steven Rostedt <rostedt@goodmis.org>
To:     Masami Hiramatsu <mhiramat@kernel.org>
Cc:     linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Frederic Weisbecker <frederic@kernel.org>,
        Joel Fernandes <joel@joelfernandes.org>,
        Andy Lutomirski <luto@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Namhyung Kim <namhyung@kernel.org>,
        "Frank Ch. Eigler" <fche@redhat.com>
Subject: Re: [RFC][PATCH 00/14 v2] function_graph: Rewrite to allow multiple
 users
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References: <20190520142001.270067280@goodmis.org>
        <20190522231955.72899b0d606adb919e8716ff@kernel.org>
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On Wed, 22 May 2019 23:19:55 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:

> >  void *fgraph_reserve_data(int size_in_bytes)
> > 
> >     Allows the entry function to reserve up to 4 words of data on
> >     the shadow stack. On success, a pointer to the contents is returned.
> >     This may be only called once per entry function.
> > 
> >  void *fgraph_retrieve_data(void)
> > 
> >     Allows the return function to retrieve the reserved data that was
> >     allocated by the entry function.  
> 
> Nice! this seems good for kretprobe too. I'll review and try to port
> kretprobe on this framework.

If you rather pull from my git repo and not download all the patches,
they are currently available in my ftrace/fgraph-multi branch.

-- Steve