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

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Date:	Tue, 24 Jul 2012 08:20:19 -0600
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Robert Richter <robert.richter@....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

On 7/23/12 12:13 PM, Arnaldo Carvalho de Melo wrote:
> 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?

Good point. So far precise_ip is used by arch/x86 only. I don't have an 
AMD based server so I don't know if there is a conflict between 
virtualization and IBS. Added Robert for advice.

David

>
>>
>> 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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