linux-kernel - [PATCH perf/core 10/22] perf: Make comm

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Date:	Wed, 09 Dec 2015 11:11:10 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH perf/core 10/22] perf: Make comm_str to use refcnt for debug

Make 'comm_str' object to use refcnt interface for debug.
This can find refcnt related memory leaks.

  ----
  # ./perf top --stdio
  ^q
  REFCNT: BUG: Unreclaimed objects found.
  REFCNT: Total 3369 objects are not reclaimed.
    "dso" leaks 193 objects
    "map" leaks 3154 objects
    "map_groups" leaks 6 objects
    "comm_str" leaks 9 objects
    "thread" leaks 7 objects
     To see all backtraces, rerun with -v option
  ----

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
---
 tools/perf/util/comm.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/comm.c b/tools/perf/util/comm.c
index 21b7ff3..77202ab 100644
--- a/tools/perf/util/comm.c
+++ b/tools/perf/util/comm.c
@@ -1,5 +1,6 @@
 #include "comm.h"
 #include "util.h"
+#include "refcnt.h"
 #include <stdlib.h>
 #include <stdio.h>
 #include <linux/atomic.h>
@@ -16,15 +17,16 @@ static struct rb_root comm_str_root;
 static struct comm_str *comm_str__get(struct comm_str *cs)
 {
 	if (cs)
-		atomic_inc(&cs->refcnt);
+		refcnt__get(cs, refcnt);
 	return cs;
 }
 
 static void comm_str__put(struct comm_str *cs)
 {
-	if (cs && atomic_dec_and_test(&cs->refcnt)) {
+	if (cs && refcnt__put(cs, refcnt)) {
 		rb_erase(&cs->rb_node, &comm_str_root);
 		zfree(&cs->str);
+		refcnt__exit(cs, refcnt);
 		free(cs);
 	}
 }
@@ -43,7 +45,7 @@ static struct comm_str *comm_str__alloc(const char *str)
 		return NULL;
 	}
 
-	atomic_set(&cs->refcnt, 0);
+	refcnt__init_as(cs, refcnt, 0, "comm_str");
 
 	return cs;
 }

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