linux-kernel - [tip:perf/core] perf unwind: Add initialized arg into unwind__prepare

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <tip-a2873325ffb21cecca8032673eb698cb4d778dc6@git.kernel.org>
Date:	Tue, 5 Jul 2016 03:21:03 -0700
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, hpa@...or.com, hekuang@...wei.com,
	jolsa@...nel.org, namhyung@...nel.org,
	linux-kernel@...r.kernel.org, dsahern@...il.com,
	a.p.zijlstra@...llo.nl, tglx@...utronix.de, mingo@...nel.org
Subject: [tip:perf/core] perf unwind: Add initialized arg into
 unwind__prepare_access

Commit-ID:  a2873325ffb21cecca8032673eb698cb4d778dc6
Gitweb:     http://git.kernel.org/tip/a2873325ffb21cecca8032673eb698cb4d778dc6
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Mon, 4 Jul 2016 14:16:22 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 4 Jul 2016 20:27:12 -0300

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@...nel.org>
Cc: David Ahern <dsahern@...il.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.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@...hat.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 f30f956..2439b12 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 8547119..6d542a4 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 84c6d44..61fb1e9 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;
 }