linux-kernel - Re: [RFC][PATCH 4/4] perf/events: Use helper functions in event assignment to shrink macro size

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Date:	Mon, 13 Aug 2012 15:52:57 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC][PATCH 4/4] perf/events: Use helper functions in event
 assignment to shrink macro size

On Mon, 2012-08-13 at 09:03 -0400, Steven Rostedt wrote:
> On Mon, 2012-08-13 at 10:03 +0200, Peter Zijlstra wrote:
> 
> > > +void perf_trace_event_submit(void *raw_data, struct ftrace_event_call *event_call,
> > > +                            struct perf_trace_event *pe)
> > > +{
> > > +       struct hlist_head *head;
> > > +
> > > +       head = this_cpu_ptr(event_call->perf_events);
> > > +       perf_trace_buf_submit(raw_data, pe->entry_size, pe->rctx, pe->addr,
> > > +                             pe->count, &pe->regs, head);
> > > +}
> > 
> > Can you make perf_trace_buf_submit() go away? Its reduced to a simple
> > fwd function and layering another wrapper on top seems like pushing it.
> 
> You mean just have perf_trace_event_submit() call perf_tp_event()
> directly?
> 
> I have no problem with that. Although I may make that into a separate
> patch to keep this patch as a 'move' and the other patch as the change.
> 
> Looking at the history of perf_trace_buf_submit(), it use to be more
> than one function call. But when you inlined
> perf_swevent_put_recursion_context(), it became just a one2one mapping.

Right.

> I'm assuming that we want to convert all calls to
> perf_trace_buf_submit()s into perf_tp_event()?

Yeah.. I think you're referring to the {u,k}probes open-coded nonsense?
Should we make those use these new helpers you created as well?
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