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perf tools: Use atomic.h for the map_groups refcount

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Now that we have atomic.h, we should convert all of the existing
refcounts to use it.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-onm5u3pioba1hqqhjs8on03e@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-05-15 15:20:44 -03:00
parent aa891009ee
commit 848cbd2562
3 changed files with 12 additions and 10 deletions
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12
tools/perf/tests/thread-mg-share.c
View File

@ -43,7 +43,7 @@ int test__thread_mg_share(void)
leader && t1 && t2 && t3 && other);
mg = leader->mg;
TEST_ASSERT_EQUAL("wrong refcnt", mg->refcnt, 4);
TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 4);
/* test the map groups pointer is shared */
TEST_ASSERT_VAL("map groups don't match", mg == t1->mg);
@ -71,25 +71,25 @@ int test__thread_mg_share(void)
machine__remove_thread(machine, other_leader);
other_mg = other->mg;
TEST_ASSERT_EQUAL("wrong refcnt", other_mg->refcnt, 2);
TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&other_mg->refcnt), 2);
TEST_ASSERT_VAL("map groups don't match", other_mg == other_leader->mg);
/* release thread group */
thread__put(leader);
TEST_ASSERT_EQUAL("wrong refcnt", mg->refcnt, 3);
TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 3);
thread__put(t1);
TEST_ASSERT_EQUAL("wrong refcnt", mg->refcnt, 2);
TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 2);
thread__put(t2);
TEST_ASSERT_EQUAL("wrong refcnt", mg->refcnt, 1);
TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 1);
thread__put(t3);
/* release other group */
thread__put(other_leader);
TEST_ASSERT_EQUAL("wrong refcnt", other_mg->refcnt, 1);
TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&other_mg->refcnt), 1);
thread__put(other);

4
tools/perf/util/map.c
View File

@ -426,7 +426,7 @@ void map_groups__init(struct map_groups *mg, struct machine *machine)
INIT_LIST_HEAD(&mg->removed_maps[i]);
}
mg->machine = machine;
mg->refcnt = 1;
atomic_set(&mg->refcnt, 1);
}
static void maps__delete(struct rb_root *maps)
@ -494,7 +494,7 @@ void map_groups__delete(struct map_groups *mg)
void map_groups__put(struct map_groups *mg)
{
if (--mg->refcnt == 0)
if (mg && atomic_dec_and_test(&mg->refcnt))
map_groups__delete(mg);
}

6
tools/perf/util/map.h
View File

@ -1,6 +1,7 @@
#ifndef __PERF_MAP_H
#define __PERF_MAP_H
#include <linux/atomic.h>
#include <linux/compiler.h>
#include <linux/list.h>
#include <linux/rbtree.h>
@ -61,7 +62,7 @@ struct map_groups {
struct rb_root maps[MAP__NR_TYPES];
struct list_head removed_maps[MAP__NR_TYPES];
struct machine *machine;
int refcnt;
atomic_t refcnt;
};
struct map_groups *map_groups__new(struct machine *machine);
@ -70,7 +71,8 @@ bool map_groups__empty(struct map_groups *mg);
static inline struct map_groups *map_groups__get(struct map_groups *mg)
{
++mg->refcnt;
if (mg)
atomic_inc(&mg->refcnt);
return mg;
}