linux-kernel - Re: [PATCH] perf auxtrace: Automatically group aux-output events

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Message-ID: <20210123231125.GC138414@krava>
Date:   Sun, 24 Jan 2021 00:11:25 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf auxtrace: Automatically group aux-output events

On Thu, Jan 21, 2021 at 04:04:18PM +0200, Adrian Hunter wrote:
> aux-output events need to have an AUX area event as the group leader.
> However, grouping events does not allow the AUX area event to be given
> an address filter because the --filter option must come after the event,
> which conflicts with the grouping syntax.
> 
> To allow filtering in that case, automatically create a group since that
> is the requirement anyway.
> 
> Example: (requires Intel Tremont)
> 
>   perf record -c 500 -e 'intel_pt//u' --filter 'filter main @ /bin/ls' -e 'cycles/aux-output/pp' ls

great, nice to see this working

jirka

> 
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> ---
>  tools/perf/builtin-record.c |  2 ++
>  tools/perf/util/auxtrace.c  | 15 +++++++++++++++
>  tools/perf/util/auxtrace.h  |  6 ++++++
>  3 files changed, 23 insertions(+)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 8a0127d4fb52..687f1449a845 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -731,6 +731,8 @@ static int record__auxtrace_init(struct record *rec)
>  	if (err)
>  		return err;
>  
> +	auxtrace_regroup_aux_output(rec->evlist);
> +
>  	return auxtrace_parse_filters(rec->evlist);
>  }
>  
> diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c
> index a60878498139..953f4afacd3b 100644
> --- a/tools/perf/util/auxtrace.c
> +++ b/tools/perf/util/auxtrace.c
> @@ -788,6 +788,21 @@ int auxtrace_parse_sample_options(struct auxtrace_record *itr,
>  	return auxtrace_validate_aux_sample_size(evlist, opts);
>  }
>  
> +void auxtrace_regroup_aux_output(struct evlist *evlist)
> +{
> +	struct evsel *evsel, *aux_evsel = NULL;
> +	struct evsel_config_term *term;
> +
> +	evlist__for_each_entry(evlist, evsel) {
> +		if (evsel__is_aux_event(evsel))
> +			aux_evsel = evsel;
> +		term = evsel__get_config_term(evsel, AUX_OUTPUT);
> +		/* If possible, group with the AUX event */
> +		if (term && aux_evsel)
> +			evlist__regroup(evlist, aux_evsel, evsel);
> +	}
> +}
> +
>  struct auxtrace_record *__weak
>  auxtrace_record__init(struct evlist *evlist __maybe_unused, int *err)
>  {
> diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
> index 7e5c9e1552bd..a4fbb33b7245 100644
> --- a/tools/perf/util/auxtrace.h
> +++ b/tools/perf/util/auxtrace.h
> @@ -559,6 +559,7 @@ int auxtrace_parse_snapshot_options(struct auxtrace_record *itr,
>  int auxtrace_parse_sample_options(struct auxtrace_record *itr,
>  				  struct evlist *evlist,
>  				  struct record_opts *opts, const char *str);
> +void auxtrace_regroup_aux_output(struct evlist *evlist);
>  int auxtrace_record__options(struct auxtrace_record *itr,
>  			     struct evlist *evlist,
>  			     struct record_opts *opts);
> @@ -740,6 +741,11 @@ int auxtrace_parse_sample_options(struct auxtrace_record *itr __maybe_unused,
>  	return -EINVAL;
>  }
>  
> +static inline
> +void auxtrace_regroup_aux_output(struct evlist *evlist __maybe_unused)
> +{
> +}
> +
>  static inline
>  int auxtrace__process_event(struct perf_session *session __maybe_unused,
>  			    union perf_event *event __maybe_unused,
> -- 
> 2.17.1
>