linux-kernel - Re: [PATCH V2 3/6] perf,tools: Dump per-sample freq/CPU%/CORE

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Message-ID: <20150726163129.GD24646@krava.brq.redhat.com>
Date:	Sun, 26 Jul 2015 18:31:29 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	a.p.zijlstra@...llo.nl, acme@...nel.org, luto@...nel.org,
	mingo@...hat.com, eranian@...gle.com, ak@...ux.intel.com,
	mark.rutland@....com, adrian.hunter@...el.com, jolsa@...nel.org,
	namhyung@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 3/6] perf,tools: Dump per-sample freq/CPU%/CORE_BUSY%
 in report -D

On Fri, Jul 24, 2015 at 09:48:29AM -0400, kan.liang@...el.com wrote:

SNIP

> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index ed9dc25..7f628d9 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -851,8 +851,14 @@ static void perf_evlist__print_tstamp(struct perf_evlist *evlist,
>  		printf("%" PRIu64 " ", sample->time);
>  }
>  
> -static void sample_read__printf(struct perf_sample *sample, u64 read_format)
> +static void sample_read__printf(struct perf_evlist *evlist,
> +				struct perf_sample *sample,
> +				u64 read_format)
>  {
> +	struct perf_evsel *evsel;
> +	struct perf_sample_id *sid;
> +	u64 data[FREQ_PERF_MAX] = { 0 };
> +
>  	printf("... sample_read:\n");
>  
>  	if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
> @@ -875,10 +881,26 @@ static void sample_read__printf(struct perf_sample *sample, u64 read_format)
>  			printf("..... id %016" PRIx64
>  			       ", value %016" PRIx64 "\n",
>  			       value->id, value->value);
> +
> +			sid = perf_evlist__id2sid(evlist, value->id);
> +			evsel = sid->evsel;
> +			if (evsel != NULL)
> +				SET_FREQ_PERF_VALUE(evsel, data,
> +						    value->value);
>  		}
>  	} else
>  		printf("..... id %016" PRIx64 ", value %016" PRIx64 "\n",
>  			sample->read.one.id, sample->read.one.value);
> +
> +	if (HAS_FREQ(data))
> +		printf("..... Freq %lu MHz\n",
> +		       (data[FREQ_PERF_CYCLES] * cpu_max_freq) / data[FREQ_PERF_REF_CYCLES]);

I dont like having those numbers (cpu_max_freq, msr_pmu_type) pushed
into global variables that would be used

I think you should somehow push those session's values 
through the whole dump_sample code

maybe make them both part of session::perf_session_env and push
this pointer along the dump_sample call stack

jirka
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