Re: [PATCH 3/5] perf tools: Reference count map_groups objects

From: David Ahern
Date: Mon Apr 14 2014 - 13:22:15 EST


On 4/14/14, 9:52 AM, Jiri Olsa wrote:
From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

We will share it among threads in the same process.

Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
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;
};


atomic for refcnt? This is part of a libperf; would be good to support multithreaded users.

David
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