linux-kernel - Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move perf on top of TP

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Message-ID: <20100505183000.GF6320@nowhere>
Date:	Wed, 5 May 2010 20:30:02 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Tejun Heo <tj@...nel.org>,
	efault@....de, avi@...hat.com, paulus@...ba.org, acme@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCHSET] sched,perf: unify tracers in sched and move
	perf on top of TP

On Wed, May 05, 2010 at 08:16:36PM +0200, Peter Zijlstra wrote:
> On Wed, 2010-05-05 at 20:15 +0200, Peter Zijlstra wrote:
> > 
> > Well, I'd much rather just see a direct call in the code than having to
> > reverse engineer wth hangs onto that _EVENT() junk.
> 
> And again, I oppose mandating CONFIG_TRACEEVENT.

And me too. But you don't need CONFIG_EVENT_TRACING for that.
TRACE_EVENT() with !CONFIG_EVENT_TRACING only produces tracepoints
if CONFIG_TRACEPOINTS.

In fact, a first progress that would handle these compromizes would
be to have CONFIG_PERF_EVENT_SW.

For now perf_event_task_sched_in and perf_event_task_sched_out can
stay as is because they are perf core utils.

But all the rest (faults, migrations, etc..) could be tracepoints builtin
only if CONFIG_PERF_EVENT_SW.
Which means CONFIG_PERF_EVENT_SW depends on CONFIG_TRACEPOINTS.

But nobody is forced to build CONFIG_PERF_EVENT_SW, breakpoints don't need
it.

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