perf evsel: Precalculate the sample size

So that we don't have to store it in the perf_session instance, because
in the future perf_session instances may have multiple evlists, each
with different sample_type/sizes.

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-ptod86fxkpgq3h62m9refkv4@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-test.c

@@ -478,7 +478,6 @@ static int test__basic_mmap(void)
 	unsigned int nr_events[nsyscalls],
 		     expected_nr_events[nsyscalls], i, j;
 	struct perf_evsel *evsels[nsyscalls], *evsel;
-	int sample_size = __perf_evsel__sample_size(attr.sample_type);
 
 	for (i = 0; i < nsyscalls; ++i) {
 		char name[64];
@@ -563,7 +562,8 @@ static int test__basic_mmap(void)
 			goto out_munmap;
 		}
 
-		err = perf_event__parse_sample(event, attr.sample_type, sample_size,
+		err = perf_event__parse_sample(event, attr.sample_type,
+					       evsels[0]->sample_size,
 					       false, &sample, false);
 		if (err) {
 			pr_err("Can't parse sample, err = %d\n", err);
@@ -666,7 +666,7 @@ static int test__PERF_RECORD(void)
 	     found_libc_mmap = false,
 	     found_vdso_mmap = false,
 	     found_ld_mmap = false;
-	int err = -1, errs = 0, i, wakeups = 0, sample_size;
+	int err = -1, errs = 0, i, wakeups = 0;
 	u32 cpu;
 	int total_events = 0, nr_events[PERF_RECORD_MAX] = { 0, };
 
@@ -761,7 +761,6 @@ static int test__PERF_RECORD(void)
 	 * event.
 	 */
 	sample_type = perf_evlist__sample_type(evlist);
-	sample_size = __perf_evsel__sample_size(sample_type);
 
 	/*
 	 * Now that all is properly set up, enable the events, they will
@@ -789,7 +788,7 @@ static int test__PERF_RECORD(void)
 					nr_events[type]++;
 
 				err = perf_event__parse_sample(event, sample_type,
-							       sample_size, true,
+							       evsel->sample_size, true,
 							       &sample, false);
 				if (err < 0) {
 					if (verbose)

tools/perf/util/evsel.c

@@ -20,7 +20,7 @@
 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
 #define GROUP_FD(group_fd, cpu) (*(int *)xyarray__entry(group_fd, cpu, 0))
 
-int __perf_evsel__sample_size(u64 sample_type)
+static int __perf_evsel__sample_size(u64 sample_type)
 {
 	u64 mask = sample_type & PERF_SAMPLE_MASK;
 	int size = 0;
@@ -53,6 +53,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
 	evsel->attr	   = *attr;
 	INIT_LIST_HEAD(&evsel->node);
 	hists__init(&evsel->hists);
+	evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
 }
 
 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)

tools/perf/util/evsel.h

@@ -65,6 +65,7 @@ struct perf_evsel {
 		void		*func;
 		void		*data;
 	} handler;
+	unsigned int		sample_size;
 	bool 			supported;
 };
 
@@ -177,13 +178,6 @@ static inline int perf_evsel__read_scaled(struct perf_evsel *evsel,
 	return __perf_evsel__read(evsel, ncpus, nthreads, true);
 }
 
-int __perf_evsel__sample_size(u64 sample_type);
-
-static inline int perf_evsel__sample_size(struct perf_evsel *evsel)
-{
-	return __perf_evsel__sample_size(evsel->attr.sample_type);
-}
-
 void hists__init(struct hists *hists);
 
 #endif /* __PERF_EVSEL_H */

tools/perf/util/python.c

@@ -806,7 +806,7 @@ static PyObject *pyrf_evlist__read_on_cpu(struct pyrf_evlist *pevlist,
 
 		first = list_entry(evlist->entries.next, struct perf_evsel, node);
 		err = perf_event__parse_sample(event, first->attr.sample_type,
-					       perf_evsel__sample_size(first),
+					       first->sample_size,
 					       sample_id_all, &pevent->sample, false);
 		if (err)
 			return PyErr_Format(PyExc_OSError,

tools/perf/util/session.c

@@ -16,6 +16,19 @@
 #include "cpumap.h"
 #include "event-parse.h"
 
+int perf_session__parse_sample(struct perf_session *session,
+			       const union perf_event *event,
+			       struct perf_sample *sample)
+{
+	struct perf_evsel *first;
+	first = list_entry(session->evlist->entries.next, struct perf_evsel, node);
+
+	return perf_event__parse_sample(event, session->sample_type,
+					first->sample_size,
+					session->sample_id_all, sample,
+					session->header.needs_swap);
+}
+
 static int perf_session__open(struct perf_session *self, bool force)
 {
 	struct stat input_stat;
@@ -83,7 +96,6 @@ out_close:
 void perf_session__update_sample_type(struct perf_session *self)
 {
 	self->sample_type = perf_evlist__sample_type(self->evlist);
-	self->sample_size = __perf_evsel__sample_size(self->sample_type);
 	self->sample_id_all = perf_evlist__sample_id_all(self->evlist);
 	self->id_hdr_size = perf_evlist__id_hdr_size(self->evlist);
 	self->host_machine.id_hdr_size = self->id_hdr_size;

tools/perf/util/session.h

@@ -42,7 +42,6 @@ struct perf_session {
 	 */
 	struct hists		hists;
 	u64			sample_type;
-	int			sample_size;
 	int			fd;
 	bool			fd_pipe;
 	bool			repipe;
@@ -130,15 +129,9 @@ size_t perf_session__fprintf_dsos_buildid(struct perf_session *self,
 
 size_t perf_session__fprintf_nr_events(struct perf_session *session, FILE *fp);
 
-static inline int perf_session__parse_sample(struct perf_session *session,
+int perf_session__parse_sample(struct perf_session *session,
 			       const union perf_event *event,
-					     struct perf_sample *sample)
-{
-	return perf_event__parse_sample(event, session->sample_type,
-					session->sample_size,
-					session->sample_id_all, sample,
-					session->header.needs_swap);
-}
+			       struct perf_sample *sample);
 
 static inline int perf_session__synthesize_sample(struct perf_session *session,
 						  union perf_event *event,