perf evsel: Improve tracepoint constructor setup

It needs to properly set the sample_type, sample_period and the KVM
related perf_event_attr fields.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-v9x3q9rv4caxtox7wtjpchq5@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evsel.c

@@ -118,13 +118,17 @@ struct perf_evsel *perf_evsel__newtp(const char *sys, const char *name, int idx)
 	if (evsel != NULL) {
 		struct perf_event_attr attr = {
 			.type	       = PERF_TYPE_TRACEPOINT,
+			.sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
+					  PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
 		};
 
 		evsel->tp_format = event_format__new(sys, name);
 		if (evsel->tp_format == NULL)
 			goto out_free;
 
+		event_attr_init(&attr);
 		attr.config = evsel->tp_format->id;
+		attr.sample_period = 1;
 		perf_evsel__init(evsel, &attr, idx);
 		evsel->name = evsel->tp_format->name;
 	}