linux-kernel - Re: [RFC] PyTimechart

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Message-ID: <1273678596.27703.30.camel@gandalf.stny.rr.com>
Date:	Wed, 12 May 2010 11:36:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Pierre Tardy <tardyp@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Tom Zanussi <tzanussi@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
	arjan@...radead.org, ziga.mahkovec@...il.com
Subject: Re: [RFC] PyTimechart

On Wed, 2010-05-12 at 16:48 +0200, Frederic Weisbecker wrote:
> On Wed, May 12, 2010 at 03:37:27PM +0200, Pierre Tardy wrote:

> But we don't yet support trace_printk in perf. May be we could wrap
> them in trace events.

Hmm, do we really want to do that?

We really need to get the perf and ftrace trace buffers combined. I
understand why perf chose to do the mmap buffers for the counting, but
for live streaming, it is very inefficient compared to splice.

I would hate to add more duplicate code to have perf support
trace_printk().

-- Steve



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