linux-kernel - Re: [PATCH 4/7] sched: Add sched_load

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Date:   Mon, 6 May 2019 16:33:17 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        Pavankumar Kondeti <pkondeti@...eaurora.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Uwe Kleine-Konig <u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 4/7] sched: Add sched_load_rq tracepoint

On 05/06/19 10:46, Steven Rostedt wrote:
> On Mon, 6 May 2019 15:42:00 +0100
> Qais Yousef <qais.yousef@....com> wrote:
> 
> > I can control that for the wrappers I'm introducing. But the actual tracepoint
> > get the 'trace_' part prepended automatically by the macros.
> > 
> > ie DECLARE_TRACE(pelt_rq, ...) will automatically generate a function called
> > trace_pelt_se(...)
> > 
> > Or am I missing something?
> 
> No trace comes from the trace points.

If you want I can do something like below to help create a distinction. It is
none enforcing though.

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 9c3186578ce0..f654ced20045 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -232,6 +232,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
  */
 #define __DECLARE_TRACE(name, proto, args, cond, data_proto, data_args) \
        extern struct tracepoint __tracepoint_##name;                   \
+       static inline void tp_##name(proto) __alias(trace_##name);      \
        static inline void trace_##name(proto)                          \
        {                                                               \
                if (static_key_false(&__tracepoint_##name.key))         \


Another option is to extend DECLARE_TRACE() to take a new argument IS_TP and
based on that select the function name. This will be enforcing but I will have
to go fixup many places.

Of course 'TP' can be replaced with anything more appealing.

--
Qais Yousef