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From:   Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
Date:   Thu, 16 Apr 2020 12:29:51 -0300
To:     Adrian Hunter <adrian.hunter@intel.com>
Cc:     Jiri Olsa <jolsa@redhat.com>, Andi Kleen <ak@linux.intel.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH 13/16] perf tools: Move leader-sampling configuration
Message-ID: <20200416152951.GB2650@kernel.org>
References: <20200401101613.6201-1-adrian.hunter@intel.com>
 <20200401101613.6201-14-adrian.hunter@intel.com>
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Em Wed, Apr 01, 2020 at 01:16:10PM +0300, Adrian Hunter escreveu:
> Move leader-sampling configuration in preparation for adding support for
> leader sampling with AUX area events.
> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
>  tools/perf/util/evsel.c  | 19 -------------------
>  tools/perf/util/record.c | 29 +++++++++++++++++++++++++++++
>  2 files changed, 29 insertions(+), 19 deletions(-)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index d4ab073c9fe7..8ddcb95396ac 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -1022,25 +1022,6 @@ void perf_evsel__config(struct evsel *evsel, struct record_opts *opts,
>  		}
>  	}
>  
> -	/*
> -	 * Disable sampling for all group members other
> -	 * than leader in case leader 'leads' the sampling.
> -	 */
> -	if ((leader != evsel) && leader->sample_read) {
> -		attr->freq           = 0;
> -		attr->sample_freq    = 0;
> -		attr->sample_period  = 0;
> -		attr->write_backward = 0;
> -
> -		/*
> -		 * We don't get sample for slave events, we make them
> -		 * when delivering group leader sample. Set the slave
> -		 * event to follow the master sample_type to ease up
> -		 * report.
> -		 */
> -		attr->sample_type = leader->core.attr.sample_type;
> -	}
> -
>  	if (opts->no_samples)
>  		attr->sample_freq = 0;
>  
> diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
> index 7def66168503..ce383fc1bbbc 100644
> --- a/tools/perf/util/record.c
> +++ b/tools/perf/util/record.c
> @@ -167,6 +167,31 @@ bool perf_can_aux_sample(void)
>  	return true;
>  }
>  
> +static void perf_evsel__config_leader_sampling(struct evsel *evsel)
> +{
> +	struct perf_event_attr *attr = &evsel->core.attr;
> +	struct evsel *leader = evsel->leader;
> +
> +	/*
> +	 * Disable sampling for all group members other
> +	 * than leader in case leader 'leads' the sampling.
> +	 */
> +	if (leader != evsel && leader->sample_read) {
> +		attr->freq           = 0;
> +		attr->sample_freq    = 0;
> +		attr->sample_period  = 0;
> +		attr->write_backward = 0;
> +
> +		/*
> +		 * We don't get sample for slave events, we make them
> +		 * when delivering group leader sample. Set the slave
> +		 * event to follow the master sample_type to ease up
> +		 * report.
> +		 */
> +		attr->sample_type = leader->core.attr.sample_type;
> +	}
> +}
> +
>  void perf_evlist__config(struct evlist *evlist, struct record_opts *opts,
>  			 struct callchain_param *callchain)
>  {
> @@ -193,6 +218,10 @@ void perf_evlist__config(struct evlist *evlist, struct record_opts *opts,
>  			evsel->core.attr.comm_exec = 1;
>  	}
>  
> +	/* Configure leader sampling here now that the sample type is known */
> +	evlist__for_each_entry(evlist, evsel)
> +		perf_evsel__config_leader_sampling(evsel, evlist);
> +
>  	if (opts->full_auxtrace) {
>  		/*
>  		 * Need to be able to synthesize and parse selected events with

  INSTALL  trace_plugins
util/record.c: In function ‘perf_evlist__config’:
util/record.c:223:3: error: too many arguments to function ‘perf_evsel__config_leader_sampling’
  223 |   perf_evsel__config_leader_sampling(evsel, evlist);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
util/record.c:170:13: note: declared here
  170 | static void perf_evsel__config_leader_sampling(struct evsel *evsel)
      |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mv: cannot stat '/tmp/build/perf/util/.record.o.tmp': No such file or directory
make[4]: *** [/home/acme/git/perf/tools/build/Makefile.build:96: /tmp/build/perf/util/record.o] Error 1


----------

I'm removing that evlist arg from here and fixing up the fallout in the
following patches :-)

- Arnaldo