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

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Message-ID: <877gj77gov.fsf@sejong.aot.lge.com>
Date:	Fri, 10 May 2013 10:43:28 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
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 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. :)

Thanks,
Namhyung

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