linux-kernel - Re: [PATCH 3/7] perf tools: Add parser for dynamic PMU events

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Date:	Mon, 07 May 2012 19:10:55 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/7] perf tools: Add parser for dynamic PMU events

On Mon, 2012-05-07 at 19:05 +0200, Robert Richter wrote:
> On 07.05.12 13:01:03, Peter Zijlstra wrote:
> > On Wed, 2012-05-02 at 20:26 +0200, Robert Richter wrote:
> > > This patch adds support for pmu specific event parsers by extending
> > > the pmu handler. The event syntax is the same as for tracepoints:
> > > 
> > >  <subsys>:<name>:<modifier> 
> > 
> > I really don't like this
> > 
> > > -          event_legacy_tracepoint sep_dc |
> > > +          event_legacy_generic sep_dc |
> > 
> > That 'legacy' in there is a good hint you shouldn't be using this.
> > 
> > Ideally I'd get rid of all legacy formats eventually, we really
> > shouldn't be adding new ones. 
> 
> Anyway, we need something like this to specify event names (pseudo
> event names in case of ibs) and userland filter options. Though, it
> must not necessarily this syntax but something else. The one above
> looks esthetic to me while some other event syntax is close to a perl
> regex. ;)

Jiri and Yan Zheng are working on something that would allow:

 ibs_op/foo/

Their solution will initially get foo from sysfs (ibs_op/events/foo),
but an external lookup should also get there. Stephane also wants/needs
something like that to plug the Intel event names in.



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