linux-kernel - Re: [PATCH 08/11] perf tool: precise mode requires exclude

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Message-ID: <20120723181358.GC6717@infradead.org>
Date:	Mon, 23 Jul 2012 20:13:58 +0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [PATCH 08/11] perf tool: precise mode requires exclude_guest

Em Fri, Jul 20, 2012 at 05:25:53PM -0600, David Ahern escreveu:
> PEBS cannot be used with guest mode. If user adds :p modifier set
> exclude_guest as well.

Is this something Intel specific? Or can someone think of an arch where
this limitation wouldn't exist?
 
> 
> Signed-off-by: David Ahern <dsahern@...il.com>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Gleb Natapov <gleb@...hat.com>
> Link: https://lkml.org/lkml/2012/7/9/264
> ---
>  tools/perf/util/parse-events.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
> index 1aa721d..f34629b 100644
> --- a/tools/perf/util/parse-events.c
> +++ b/tools/perf/util/parse-events.c
> @@ -653,6 +653,9 @@ int parse_events_modifier(struct list_head *list, char *str)
>  			eH = 0;
>  		} else if (*str == 'p') {
>  			precise++;
> +			/* use of precise requires exclude_guest */
> +			if (!exclude_GH)
> +				eG = 1;
>  		} else
>  			break;
>  
> -- 
> 1.7.10.1
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