Commit e4caec0d authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

perf evsel: Add PERF_SAMPLE_READ sample related processing 



For sample with sample type PERF_SAMPLE_READ the period value is stored
in the 'struct sample_read'.

Moreover if the read format has PERF_FORMAT_GROUP, the 'struct
sample_read' contains period values for all events in the group (for
which the sample's event is a leader).

We deliver separated samples for all the values contained within the
'struct sample_read'.

Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-6mdm5xkrm6kypouh1c33cyys@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 932a3594

tools/perf/util/evsel.h

+3 −0
Original line number Diff line number Diff line
@@ -38,6 +38,9 @@ struct perf_sample_id { 
	struct hlist_node 	node;

	u64		 	id;

	struct perf_evsel	*evsel;



	/* Holds total ID period value for PERF_SAMPLE_READ processing. */

	u64			period;

};



/** struct perf_evsel - event selector

tools/perf/util/session.c

+71 −1
Original line number Diff line number Diff line
@@ -860,6 +860,75 @@ static struct machine * 
	return &session->machines.host;

}



static int deliver_sample_value(struct perf_session *session,

				struct perf_tool *tool,

				union perf_event *event,

				struct perf_sample *sample,

				struct sample_read_value *v,

				struct machine *machine)

{

	struct perf_sample_id *sid;



	sid = perf_evlist__id2sid(session->evlist, v->id);

	if (sid) {

		sample->id     = v->id;

		sample->period = v->value - sid->period;

		sid->period    = v->value;

	}



	if (!sid || sid->evsel == NULL) {

		++session->stats.nr_unknown_id;

		return 0;

	}



	return tool->sample(tool, event, sample, sid->evsel, machine);

}



static int deliver_sample_group(struct perf_session *session,

				struct perf_tool *tool,

				union  perf_event *event,

				struct perf_sample *sample,

				struct machine *machine)

{

	int ret = -EINVAL;

	u64 i;



	for (i = 0; i < sample->read.group.nr; i++) {

		ret = deliver_sample_value(session, tool, event, sample,

					   &sample->read.group.values[i],

					   machine);

		if (ret)

			break;

	}



	return ret;

}



static int

perf_session__deliver_sample(struct perf_session *session,

			     struct perf_tool *tool,

			     union  perf_event *event,

			     struct perf_sample *sample,

			     struct perf_evsel *evsel,

			     struct machine *machine)

{

	/* We know evsel != NULL. */

	u64 sample_type = evsel->attr.sample_type;

	u64 read_format = evsel->attr.read_format;



	/* Standard sample delievery. */

	if (!(sample_type & PERF_SAMPLE_READ))

		return tool->sample(tool, event, sample, evsel, machine);



	/* For PERF_SAMPLE_READ we have either single or group mode. */

	if (read_format & PERF_FORMAT_GROUP)

		return deliver_sample_group(session, tool, event, sample,

					    machine);

	else

		return deliver_sample_value(session, tool, event, sample,

					    &sample->read.one, machine);

}



static int perf_session_deliver_event(struct perf_session *session,

				      union perf_event *event,

				      struct perf_sample *sample,
@@ -902,7 +971,8 @@ static int perf_session_deliver_event(struct perf_session *session, 
			++session->stats.nr_unprocessable_samples;

			return 0;

		}

		return tool->sample(tool, event, sample, evsel, machine);

		return perf_session__deliver_sample(session, tool, event,

						    sample, evsel, machine);

	case PERF_RECORD_MMAP:

		return tool->mmap(tool, event, sample, machine);

	case PERF_RECORD_COMM:

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