[PATCH v8 04/14] perf tools: Move unwind__prepare_access from thread_new into thread__insert_map

From: He Kuang
Date: Thu Jun 02 2016 - 05:56:04 EST


For determine the libunwind methods to use, we should get the
32bit/64bit information from maps of a thread. When a thread is newly
created, the information is not prepared. This patch moves
unwind__prepare_access() into thread__insert_map() so we can get the
information we need from maps. Meanwhile, let thread__insert_map()
return value and show messages on error.

Signed-off-by: He Kuang <hekuang@xxxxxxxxxx>
---
tools/perf/util/machine.c | 14 ++++++++++++--
tools/perf/util/thread.c | 13 +++++++++----
tools/perf/util/thread.h | 2 +-
3 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index bdc33ce..ef4f785 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -1353,11 +1353,16 @@ int machine__process_mmap2_event(struct machine *machine,
if (map == NULL)
goto out_problem_map;

- thread__insert_map(thread, map);
+ ret = thread__insert_map(thread, map);
+ if (ret)
+ goto out_problem_insert;
+
thread__put(thread);
map__put(map);
return 0;

+out_problem_insert:
+ map__put(map);
out_problem_map:
thread__put(thread);
out_problem:
@@ -1403,11 +1408,16 @@ int machine__process_mmap_event(struct machine *machine, union perf_event *event
if (map == NULL)
goto out_problem_map;

- thread__insert_map(thread, map);
+ ret = thread__insert_map(thread, map);
+ if (ret)
+ goto out_problem_insert;
+
thread__put(thread);
map__put(map);
return 0;

+out_problem_insert:
+ map__put(map);
out_problem_map:
thread__put(thread);
out_problem:
diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 45fcb71..a33e76c 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -43,9 +43,6 @@ struct thread *thread__new(pid_t pid, pid_t tid)
thread->cpu = -1;
INIT_LIST_HEAD(&thread->comm_list);

- if (unwind__prepare_access(thread) < 0)
- goto err_thread;
-
comm_str = malloc(32);
if (!comm_str)
goto err_thread;
@@ -201,10 +198,18 @@ size_t thread__fprintf(struct thread *thread, FILE *fp)
map_groups__fprintf(thread->mg, fp);
}

-void thread__insert_map(struct thread *thread, struct map *map)
+int thread__insert_map(struct thread *thread, struct map *map)
{
+ int ret;
+
map_groups__fixup_overlappings(thread->mg, map, stderr);
map_groups__insert(thread->mg, map);
+
+ ret = unwind__prepare_access(thread);
+ if (ret)
+ map_groups__remove(thread->mg, map);
+
+ return ret;
}

static int thread__clone_map_groups(struct thread *thread,
diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
index 152fb9a..e7a82a3 100644
--- a/tools/perf/util/thread.h
+++ b/tools/perf/util/thread.h
@@ -76,7 +76,7 @@ int thread__comm_len(struct thread *thread);
struct comm *thread__comm(const struct thread *thread);
struct comm *thread__exec_comm(const struct thread *thread);
const char *thread__comm_str(const struct thread *thread);
-void thread__insert_map(struct thread *thread, struct map *map);
+int thread__insert_map(struct thread *thread, struct map *map);
int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp);
size_t thread__fprintf(struct thread *thread, FILE *fp);

--
1.8.5.2