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

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Message-ID: <20110328095223.76e4debe@mfleming-mobl1.ger.corp.intel.com>
Date:	Mon, 28 Mar 2011 09:52:23 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Lin Ming <ming.m.lin@...el.com>, mingo@...e.hu,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	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>,
	"2nddept-manager@....hitachi.co.jp" 
	<2nddept-manager@....hitachi.co.jp>
Subject: Re: [RFC] perf: EBNF for event syntax

On Mon, 28 Mar 2011 09:58:10 +0200
Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> Groups are most useful in measuring events on another base, which is
> basically mandatory if your primary event doesn't have sampling
> support itself.

Just FYI...

When I was looking at group event support for SH (because the hardware
doesn't have sampling support) I was trying to avoid the user being
required to setup the groups on the command-line, e.g. I wrote it so
that the group event creation was all done "behind the scenes".

For those architectures/platforms that are missing sampling support I
still think that group event creation should be as invisible as
possible.
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