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.
Signed-off-by: He Kuang <heku...@huawei.com> --- tools/perf/util/thread.c | 7 ++----- tools/perf/util/unwind-libunwind.c | 7 +++---- 2 files changed, 5 insertions(+), 9 deletions(-) diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index 6d3900c..045477d 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -43,11 +43,6 @@ struct thread *thread__new(pid_t pid, pid_t tid) thread->cpu = -1; INIT_LIST_HEAD(&thread->comm_list); - register_local_unwind_libunwind_ops(thread); - - if (unwind__prepare_access(thread) < 0) - goto err_thread; - comm_str = malloc(32); if (!comm_str) goto err_thread; @@ -207,6 +202,8 @@ void thread__insert_map(struct thread *thread, struct map *map) { map_groups__fixup_overlappings(thread->mg, map, stderr); map_groups__insert(thread->mg, map); + + unwind__prepare_access(thread); } static int thread__clone_map_groups(struct thread *thread, diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c index 0277b22..93d2d8e 100644 --- a/tools/perf/util/unwind-libunwind.c +++ b/tools/perf/util/unwind-libunwind.c @@ -695,10 +695,9 @@ void register_local_unwind_libunwind_ops(struct thread *thread) int unwind__prepare_access(struct thread *thread) { - if (thread->unwind_libunwind_ops) - return thread->unwind_libunwind_ops->prepare_access(thread); - else - return 0; + register_local_unwind_libunwind_ops(thread); + + return thread->unwind_libunwind_ops->prepare_access(thread); } void unwind__flush_access(struct thread *thread) -- 1.8.5.2