perf evsel: Introduce perf_evsel__{in,ex}it

Out of the {con,des}structor, as in interpreted language bindings we will
need to go back from the wrapper object to the real thing. In that case
using container_of will save us to have an extra pointer in the perf_evsel
struct.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/evlist.c

@@ -6,17 +6,21 @@
 #include <linux/bitops.h>
 #include <linux/hash.h>
 
-struct perf_evlist *perf_evlist__new(void)
+void perf_evlist__init(struct perf_evlist *evlist)
 {
-	struct perf_evlist *evlist = zalloc(sizeof(*evlist));
-
-	if (evlist != NULL) {
 	int i;
 
 	for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
 		INIT_HLIST_HEAD(&evlist->heads[i]);
 	INIT_LIST_HEAD(&evlist->entries);
-	}
+}
+
+struct perf_evlist *perf_evlist__new(void)
+{
+	struct perf_evlist *evlist = zalloc(sizeof(*evlist));
+
+	if (evlist != NULL)
+		perf_evlist__init(evlist);
 
 	return evlist;
 }
@@ -33,11 +37,18 @@ static void perf_evlist__purge(struct perf_evlist *evlist)
 	evlist->nr_entries = 0;
 }
 
-void perf_evlist__delete(struct perf_evlist *evlist)
+void perf_evlist__exit(struct perf_evlist *evlist)
 {
-	perf_evlist__purge(evlist);
 	free(evlist->mmap);
 	free(evlist->pollfd);
+	evlist->mmap = NULL;
+	evlist->pollfd = NULL;
+}
+
+void perf_evlist__delete(struct perf_evlist *evlist)
+{
+	perf_evlist__purge(evlist);
+	perf_evlist__exit(evlist);
 	free(evlist);
 }
 

tools/perf/util/evlist.h

@@ -24,6 +24,8 @@ struct perf_evlist {
 struct perf_evsel;
 
 struct perf_evlist *perf_evlist__new(void);
+void perf_evlist__init(struct perf_evlist *evlist);
+void perf_evlist__exit(struct perf_evlist *evlist);
 void perf_evlist__delete(struct perf_evlist *evlist);
 
 void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry);

tools/perf/util/evsel.c

@@ -14,15 +14,20 @@
 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
 #define SID(e, x, y) xyarray__entry(e->id, x, y)
 
-struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
+void perf_evsel__init(struct perf_evsel *evsel,
+		      struct perf_event_attr *attr, int idx)
 {
-	struct perf_evsel *evsel = zalloc(sizeof(*evsel));
-
-	if (evsel != NULL) {
 	evsel->idx	   = idx;
 	evsel->attr	   = *attr;
 	INIT_LIST_HEAD(&evsel->node);
-	}
+}
+
+struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
+{
+	struct perf_evsel *evsel = zalloc(sizeof(*evsel));
+
+	if (evsel != NULL)
+		perf_evsel__init(evsel, attr, idx);
 
 	return evsel;
 }
@@ -87,11 +92,16 @@ int perf_evlist__alloc_mmap(struct perf_evlist *evlist, int ncpus)
 	return evlist->mmap != NULL ? 0 : -ENOMEM;
 }
 
-void perf_evsel__delete(struct perf_evsel *evsel)
+void perf_evsel__exit(struct perf_evsel *evsel)
 {
 	assert(list_empty(&evsel->node));
 	xyarray__delete(evsel->fd);
 	xyarray__delete(evsel->id);
+}
+
+void perf_evsel__delete(struct perf_evsel *evsel)
+{
+	perf_evsel__exit(evsel);
 	free(evsel);
 }
 

tools/perf/util/evsel.h

@@ -52,6 +52,9 @@ struct thread_map;
 struct perf_evlist;
 
 struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx);
+void perf_evsel__init(struct perf_evsel *evsel,
+		      struct perf_event_attr *attr, int idx);
+void perf_evsel__exit(struct perf_evsel *evsel);
 void perf_evsel__delete(struct perf_evsel *evsel);
 
 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads);