linux-kernel - Re: [PATCH 4/9] perf tools: Add a precise event qualifier

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Message-ID: <20130510091027.GC1040@krava.brq.redhat.com>
Date:	Fri, 10 May 2013 11:10:27 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 4/9] perf tools: Add a precise event qualifier

On Fri, May 10, 2013 at 10:43:28AM +0900, Namhyung Kim wrote:
> On Thu,  9 May 2013 15:32:19 +0200, Jiri Olsa wrote:
> > From: Andi Kleen <ak@...ux.intel.com>
> >
> > Add a precise qualifier, like cpu/event=0x3c,precise=1/
> >
> > This is needed so that the kernel can request enabling PEBS
> > for TSX events. The parser bails out on any sysfs parse errors,
> > so this is needed in any case to handle any event on the TSX
> > perf kernel.
> [SNIP]
> > --- a/tools/perf/util/parse-events.c
> > +++ b/tools/perf/util/parse-events.c
> > @@ -568,6 +568,12 @@ do {								\
> >  	case PARSE_EVENTS__TERM_TYPE_NAME:
> >  		CHECK_TYPE_VAL(STR);
> >  		break;
> > +	case PARSE_EVENTS__TERM_TYPE_PRECISE:
> > +		CHECK_TYPE_VAL(NUM);
> > +		if ((unsigned)term->val.num > 2)
> 
> Shouldn't it be 3 as we technically allow the 'ppp' modifier?  Although
> there's no cpu suppports precise=3 currently, things can be changed. :)

ok

jirka

> 
> Thanks,
> Namhyung
> 
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