linux-kernel - Re: [PATCH] perf tools: Fix ordering with unstable tsc

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Date:	Wed, 22 Feb 2012 08:39:49 -0700
From:	David Ahern <dsahern@...il.com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] perf tools: Fix ordering with unstable tsc

On 2/22/12 8:35 AM, Stephane Eranian wrote:
>> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
>> index 302d49a..1c8eb4b 100644
>> --- a/tools/perf/util/evsel.c
>> +++ b/tools/perf/util/evsel.c
>> @@ -119,9 +119,12 @@ void perf_evsel__config(struct perf_evsel *evsel, struct perf_record_opts *opts)
>>         if (opts->raw_samples) {
>>                 attr->sample_type       |= PERF_SAMPLE_TIME;
>>                 attr->sample_type       |= PERF_SAMPLE_RAW;
>> -               attr->sample_type       |= PERF_SAMPLE_CPU;
>>         }
>>
> I don't get this bit here. You may want CPU information when capturing
> in raw + per-thread mode.

TIME is added to sample_type for raw samples and then CPU gets added below.

>
>
>> +       /* Need to know the CPU for tools that need to order events */
>> +       if (attr->sample_type&  PERF_SAMPLE_TIME)
>> +               attr->sample_type       |= PERF_SAMPLE_CPU;
>> +


David
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