linux-kernel - [tip:perf/core] perf tools: Reference count map

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Message-ID: <tip-a26ca6716a6c683f40bd676cea7e89704653b98d@git.kernel.org>
Date:	Mon, 28 Apr 2014 23:46:27 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	eranian@...gle.com, acme@...hat.com, mingo@...nel.org,
	jolsa@...nel.org, a.p.zijlstra@...llo.nl, efault@....de,
	acme@...nel.org, fweisbec@...il.com, dsahern@...il.com,
	tglx@...utronix.de, cjashfor@...ux.vnet.ibm.com,
	dzickus@...hat.com, hpa@...or.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, namhyung@...nel.org,
	adrian.hunter@...el.com
Subject: [tip:perf/core] perf tools: Reference count map_groups objects

Commit-ID:  a26ca6716a6c683f40bd676cea7e89704653b98d
Gitweb:     http://git.kernel.org/tip/a26ca6716a6c683f40bd676cea7e89704653b98d
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 25 Mar 2014 15:26:44 -0300
Committer:  Jiri Olsa <jolsa@...nel.org>
CommitDate: Mon, 28 Apr 2014 13:43:26 +0200

perf tools: Reference count map_groups objects

We will share it among threads in the same process.
Adding map_groups__get/map_groups__put interface for that.

Signed-off-by: Arnaldo Carvalho de Melo <acme@...nel.org>
Acked-by: Namhyung Kim <namhyung@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1397490723-1992-4-git-send-email-jolsa@redhat.com
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/util/map.c    | 7 +++++++
 tools/perf/util/map.h    | 9 +++++++++
 tools/perf/util/thread.c | 2 +-
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index ae4c5e1..ba5f5c0c 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -323,6 +323,7 @@ void map_groups__init(struct map_groups *mg)
 		INIT_LIST_HEAD(&mg->removed_maps[i]);
 	}
 	mg->machine = NULL;
+	mg->refcnt = 1;
 }
 
 static void maps__delete(struct rb_root *maps)
@@ -374,6 +375,12 @@ void map_groups__delete(struct map_groups *mg)
 	free(mg);
 }
 
+void map_groups__put(struct map_groups *mg)
+{
+	if (--mg->refcnt == 0)
+		map_groups__delete(mg);
+}
+
 void map_groups__flush(struct map_groups *mg)
 {
 	int type;
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 1073e2d..d6445b2 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -59,11 +59,20 @@ struct map_groups {
 	struct rb_root	 maps[MAP__NR_TYPES];
 	struct list_head removed_maps[MAP__NR_TYPES];
 	struct machine	 *machine;
+	int		 refcnt;
 };
 
 struct map_groups *map_groups__new(void);
 void map_groups__delete(struct map_groups *mg);
 
+static inline struct map_groups *map_groups__get(struct map_groups *mg)
+{
+	++mg->refcnt;
+	return mg;
+}
+
+void map_groups__put(struct map_groups *mg);
+
 static inline struct kmap *map__kmap(struct map *map)
 {
 	return (struct kmap *)(map + 1);
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index dc51d16..b501848 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -50,7 +50,7 @@ void thread__delete(struct thread *thread)
 {
 	struct comm *comm, *tmp;
 
-	map_groups__delete(thread->mg);
+	map_groups__put(thread->mg);
 	thread->mg = NULL;
 	list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
 		list_del(&comm->list);
--
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