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authorJiri Olsa <jolsa@kernel.org>2016-07-04 15:16:22 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-07-05 02:27:12 +0300
commita2873325ffb21cecca8032673eb698cb4d778dc6 (patch)
treea71d006f2ccebeefa1cd52a1e38a1dba5fa81e25 /tools/perf/util/unwind-libunwind.c
parent347ca878062d5fb0e16db1fae81b0994f2457efd (diff)
downloadlinux-a2873325ffb21cecca8032673eb698cb4d778dc6.tar.xz
perf unwind: Add initialized arg into unwind__prepare_access
Adding initialized arg into unwind__prepare_access to get feedback about the initialization state. It's not possible to get it from error code, because we return 0 even in case we don't recognize dso, which is valid. The 'initialized' value is used in following patch to speedup unwind__prepare_access calls logic in fork path. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: He Kuang <hekuang@huawei.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1467634583-29147-4-git-send-email-jolsa@kernel.org [ Remove ; after static inline function signatures, fixes build break ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/unwind-libunwind.c')
-rw-r--r--tools/perf/util/unwind-libunwind.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index 854711966cad..6d542a4e0648 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -14,15 +14,19 @@ static void unwind__register_ops(struct thread *thread,
thread->unwind_libunwind_ops = ops;
}
-int unwind__prepare_access(struct thread *thread, struct map *map)
+int unwind__prepare_access(struct thread *thread, struct map *map,
+ bool *initialized)
{
const char *arch;
enum dso_type dso_type;
struct unwind_libunwind_ops *ops = local_unwind_libunwind_ops;
+ int err;
if (thread->addr_space) {
pr_debug("unwind: thread map already set, dso=%s\n",
map->dso->name);
+ if (initialized)
+ *initialized = true;
return 0;
}
@@ -51,7 +55,10 @@ int unwind__prepare_access(struct thread *thread, struct map *map)
out_register:
unwind__register_ops(thread, ops);
- return thread->unwind_libunwind_ops->prepare_access(thread);
+ err = thread->unwind_libunwind_ops->prepare_access(thread);
+ if (initialized)
+ *initialized = err ? false : true;
+ return err;
}
void unwind__flush_access(struct thread *thread)