Re: [PATCH 4/4 v3] perf stat: Add transaction flag (-T) support for s390

[Jiri Olsa]

On Mon, Jun 25, 2018 at 11:52:47AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Jun 25, 2018 at 02:58:56PM +0200, Thomas Richter escreveu:
> > perf stat command line flag -T to display transaction counters is
> > currently supported for x86 only.
> > Add support for s390. It is based on the metrics flag -M transaction
> > using the architecture dependend json files. This requires a metric
> > named "transaction" in the json files for the platform.
> 
> You forgot to CC Andi in this post, Andi, is everything ok now? May I
> have your reviewed-by or acked-by?

hu, I haven't got this one either.. will check

jirka

> 
> Thanks,
> 
> - Arnaldo
>  
> > v2 --> v3:
> > Introduce new function metricgroup__has_metric() to check for
> > the existance of a metric named transaction.
> > 
> > As suggested by Andi Kleen, this is the new approach to support
> > transactions counters. Other architectures will follow.
> > 
> > Output before:
> > [root@p23lp27 perf]# ./perf stat -T -- sleep 1
> > Cannot set up transaction events
> > [root@p23lp27 perf]#
> > 
> > Output after:
> > [root@s35lp76 perf]# ./perf stat -T -- ~/mytesttx 1 >/tmp/111
> > 
> >  Performance counter stats for '/root/mytesttx 1':
> > 
> >                  1      tx_c_tend           #     13.0 transaction
> >                  1      tx_nc_tend
> >                 11      tx_nc_tabort
> >                  0      tx_c_tabort_special
> >                  0      tx_c_tabort_no_special
> > 
> >        0.001070109 seconds time elapsed
> > 
> > [root@s35lp76 perf]#
> > 
> > Suggested-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
> > Signed-off-by: Thomas Richter <tmricht@xxxxxxxxxxxxx>
> > Suggested-by: Hendrik Brueckner <brueckner@xxxxxxxxxxxxx>
> > Reviewed-by: Hendrik Brueckner <brueckner@xxxxxxxxxxxxx>
> > ---
> >  tools/perf/builtin-stat.c     | 12 ++++++++++++
> >  tools/perf/util/metricgroup.c | 23 +++++++++++++++++++++++
> >  tools/perf/util/metricgroup.h |  1 +
> >  3 files changed, 36 insertions(+)
> > 
> > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> > index a4f662a462c6..e309279e7b04 100644
> > --- a/tools/perf/builtin-stat.c
> > +++ b/tools/perf/builtin-stat.c
> > @@ -2425,6 +2425,18 @@ static int add_default_attributes(void)
> >  	if (transaction_run) {
> >  		struct parse_events_error errinfo;
> >  
> > +		/* Handle -T as -M transaction. Once platform specific metrics
> > +		 * support has been added to the json files, all archictures
> > +		 * will use this approach. To determine transaction support
> > +		 * on an architecture test for such a metric name.
> > +		 */
> > +		if (metricgroup__has_metric("transaction")) {
> > +			struct option opt = { .value = &evsel_list };
> > +
> > +			return metricgroup__parse_groups(&opt, "transaction",
> > +							 &metric_events);
> > +		}
> > +
> >  		if (pmu_have_event("cpu", "cycles-ct") &&
> >  		    pmu_have_event("cpu", "el-start"))
> >  			err = parse_events(evsel_list, transaction_attrs,
> > diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> > index 1ddc3d1d0147..90cff5226ecc 100644
> > --- a/tools/perf/util/metricgroup.c
> > +++ b/tools/perf/util/metricgroup.c
> > @@ -490,3 +490,26 @@ int metricgroup__parse_groups(const struct option *opt,
> >  	metricgroup__free_egroups(&group_list);
> >  	return ret;
> >  }
> > +
> > +bool metricgroup__has_metric(const char *metric)
> > +{
> > +	struct pmu_events_map *map = perf_pmu__find_map(NULL);
> > +	struct pmu_event *pe;
> > +	int i;
> > +
> > +	if (!map)
> > +		return false;
> > +
> > +	for (i = 0; ; i++) {
> > +		pe = &map->table[i];
> > +
> > +		if (!pe->name && !pe->metric_group && !pe->metric_name)
> > +			break;
> > +		if (!pe->metric_expr)
> > +			continue;
> > +		if (match_metric(pe->metric_group, metric) ||
> > +		    match_metric(pe->metric_name, metric))
> > +			return true;
> > +	}
> > +	return false;
> > +}
> > diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
> > index 06854e125ee7..8a155dba0581 100644
> > --- a/tools/perf/util/metricgroup.h
> > +++ b/tools/perf/util/metricgroup.h
> > @@ -28,4 +28,5 @@ int metricgroup__parse_groups(const struct option *opt,
> >  			struct rblist *metric_events);
> >  
> >  void metricgroup__print(bool metrics, bool groups, char *filter, bool raw);
> > +bool metricgroup__has_metric(const char *metric);
> >  #endif
> > -- 
> > 2.14.3