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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: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung 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: Arnaldo Carvalho de Melo <acme@redhat.com>
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2 changed files with 74 additions and 1 deletions
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@ -38,6 +38,9 @@ struct perf_sample_id {
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struct hlist_node node;
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u64 id;
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struct perf_evsel *evsel;
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/* Holds total ID period value for PERF_SAMPLE_READ processing. */
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u64 period;
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};
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/** struct perf_evsel - event selector
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@ -860,6 +860,75 @@ static struct machine *
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return &session->machines.host;
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}
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static int deliver_sample_value(struct perf_session *session,
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struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct sample_read_value *v,
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struct machine *machine)
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{
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struct perf_sample_id *sid;
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sid = perf_evlist__id2sid(session->evlist, v->id);
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if (sid) {
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sample->id = v->id;
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sample->period = v->value - sid->period;
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sid->period = v->value;
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}
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if (!sid || sid->evsel == NULL) {
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++session->stats.nr_unknown_id;
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return 0;
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}
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return tool->sample(tool, event, sample, sid->evsel, machine);
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}
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static int deliver_sample_group(struct perf_session *session,
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struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct machine *machine)
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{
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int ret = -EINVAL;
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u64 i;
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for (i = 0; i < sample->read.group.nr; i++) {
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ret = deliver_sample_value(session, tool, event, sample,
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&sample->read.group.values[i],
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machine);
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if (ret)
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break;
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}
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return ret;
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}
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static int
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perf_session__deliver_sample(struct perf_session *session,
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struct perf_tool *tool,
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union perf_event *event,
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struct perf_sample *sample,
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struct perf_evsel *evsel,
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struct machine *machine)
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{
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/* We know evsel != NULL. */
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u64 sample_type = evsel->attr.sample_type;
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u64 read_format = evsel->attr.read_format;
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/* Standard sample delievery. */
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if (!(sample_type & PERF_SAMPLE_READ))
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return tool->sample(tool, event, sample, evsel, machine);
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/* For PERF_SAMPLE_READ we have either single or group mode. */
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if (read_format & PERF_FORMAT_GROUP)
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return deliver_sample_group(session, tool, event, sample,
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machine);
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else
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return deliver_sample_value(session, tool, event, sample,
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&sample->read.one, machine);
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}
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static int perf_session_deliver_event(struct perf_session *session,
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union perf_event *event,
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struct perf_sample *sample,
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@ -902,7 +971,8 @@ static int perf_session_deliver_event(struct perf_session *session,
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++session->stats.nr_unprocessable_samples;
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return 0;
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}
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return tool->sample(tool, event, sample, evsel, machine);
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return perf_session__deliver_sample(session, tool, event,
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sample, evsel, machine);
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case PERF_RECORD_MMAP:
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return tool->mmap(tool, event, sample, machine);
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case PERF_RECORD_COMM:
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