linux-kernel - Re: [PATCH V6 04/25] perf tools: Add support for AUX area recording

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Date:	Tue, 24 Mar 2015 12:07:10 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH V6 04/25] perf tools: Add support for AUX area recording

On Mon, Mar 16, 2015 at 02:41:26PM +0200, Adrian Hunter wrote:

SNIP

> index 8acd0df..7553788 100644
> --- a/tools/perf/util/record.c
> +++ b/tools/perf/util/record.c
> @@ -119,7 +119,16 @@ void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts)
>  			evsel->attr.comm_exec = 1;
>  	}
>  
> -	if (evlist->nr_entries > 1) {
> +	if (opts->full_auxtrace) {
> +		/*
> +		 * Need to be able to synthesize and parse selected events with
> +		 * arbitrary sample types, which requires always being able to
> +		 * match the id.
> +		 */
> +		use_sample_identifier = true;

no need to set use_sample_identifier, you can call
perf_evsel__set_sample_id with true


> +		evlist__for_each(evlist, evsel)
> +			perf_evsel__set_sample_id(evsel, use_sample_identifier);
> +	} else if (evlist->nr_entries > 1) {

but shouldn't you first detect the perf_can_sample_identifier bool same
as the other leg does and use it accordingly? maybe smth like:


	if (evlist->nr_entries > 1 || opts->full_auxtrace) {
		...
	}

	if (opts->full_auxtrace && !use_sample_identifier)
		err..


jirka
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