linux-kernel - Re: [RFC] perf: EBNF for event syntax

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Message-ID: <AANLkTiktD6pqxNsy+9gXfKKRfooNxd2goLOwCP5-GRD8@mail.gmail.com>
Date:	Sat, 26 Mar 2011 16:48:50 -0400
From:	Ulrich Drepper <drepper@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Lin Ming <ming.m.lin@...el.com>, "mingo@...e.hu" <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Matt Fleming <matt@...sole-pimps.org>
Subject: Re: [RFC] perf: EBNF for event syntax

On Fri, Mar 25, 2011 at 10:17, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> Right, and as said changing this would create some backward compat
> problems so I'm not sure its the best proposal, just wanted to raise the
> issue that such functionality would be nice.

Not only nice, it's pretty much a requirement.  Most useful statistics
come in the form of ratios.  Collecting the values for ratios much
happen concurrently.  Currently perf isn't better than oprofile in
this respect.  One has to start perf separately for each ratio.
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