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[PATCH 10/16] perf unwind: Add initialized arg into unwind__prepare_access

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From: Jiri Olsa <jolsa@kernel.org>

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>
---
 tools/perf/util/thread.c           |  2 +-
 tools/perf/util/unwind-libunwind.c | 11 +++++++++--
 tools/perf/util/unwind.h           |  9 ++++++---
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index f30f9566fddc..2439b122a4e4 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -202,7 +202,7 @@ int thread__insert_map(struct thread *thread, struct map *map)
 {
 	int ret;
 
-	ret = unwind__prepare_access(thread, map);
+	ret = unwind__prepare_access(thread, map, NULL);
 	if (ret)
 		return ret;
 
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)
diff --git a/tools/perf/util/unwind.h b/tools/perf/util/unwind.h
index 84c6d44d52f9..61fb1e90ff51 100644
--- a/tools/perf/util/unwind.h
+++ b/tools/perf/util/unwind.h
@@ -42,12 +42,14 @@ int unwind__get_entries(unwind_entry_cb_t cb, void *arg,
 #endif
 
 int LIBUNWIND__ARCH_REG_ID(int regnum);
-int unwind__prepare_access(struct thread *thread, struct map *map);
+int unwind__prepare_access(struct thread *thread, struct map *map,
+			   bool *initialized);
 void unwind__flush_access(struct thread *thread);
 void unwind__finish_access(struct thread *thread);
 #else
 static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
-					 struct map *map __maybe_unused)
+					 struct map *map __maybe_unused,
+					 bool *initialized __maybe_unused)
 {
 	return 0;
 }
@@ -67,7 +69,8 @@ unwind__get_entries(unwind_entry_cb_t cb __maybe_unused,
 }
 
 static inline int unwind__prepare_access(struct thread *thread __maybe_unused,
-					 struct map *map __maybe_unused)
+					 struct map *map __maybe_unused,
+					 bool *initialized __maybe_unused)
 {
 	return 0;
 }
-- 
2.7.4

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[GIT PULL 00/16] perf/core improvements and fixes Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:40 +0200
  [PATCH 10/16] perf unwind: Add initialized arg into unwind__prepare_access Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:40 +0200
  [PATCH 07/16] perf buildid-cache: Scan and import user SDT events to probe cache Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:40 +0200
  [PATCH 14/16] tools lib subcmd: Respect WERROR=0 for build Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  [PATCH 01/16] perf probe: Use cache entry if possible Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  [PATCH 05/16] perf sdt: ELF support for SDT Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  [PATCH 13/16] tools lib api: Respect WERROR=0 for build Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  [PATCH 08/16] perf header: Transform nodes string info to struct Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  [PATCH 09/16] perf tests: Fix hist accumulation test Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  [PATCH 16/16] perf tools: Sync copy of syscall_64.tbl with the kernel Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  [PATCH 15/16] perf tools: Update android build documentation Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  [PATCH 12/16] tools lib bpf: Add license header Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-07-05 02:50 +0200
  Re: [GIT PULL 00/16] perf/core improvements and fixes Ingo Molnar <mingo@kernel.org> - 2016-07-05 12:20 +0200

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