linux-kernel - [RFC 1/6] perf probe: Do not exclude mangled C++ funcs

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Date:   Mon, 14 May 2018 12:19:35 +0800
From:   Holger Freyther <automatic+kernel@...yther.de>
To:     linux-kernel@...r.kernel.org
Cc:     Holger Hans Peter Freyther <holgar+kernel@...gle.com>
Subject: [RFC 1/6] perf probe: Do not exclude mangled C++ funcs

From: Holger Hans Peter Freyther <holgar+kernel@...gle.com>

Using --funcs --no-demangle on a C++ binary does not list any of the C++
functions. Change the default filter to not exclude the Common C++ ABI
symbols.

 $ ./perf probe -x ./cxx-example --funcs --no-demangle
 ...
 _ZN9__gnu_cxx13new_allocatorIiEC1Ev
 ...

Signed-off-by: Holger Hans Peter Freyther <holgar+kernel@...gle.com>
---
 tools/perf/builtin-probe.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index c006592..d69f679 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -43,7 +43,7 @@
 #include "util/probe-file.h"
 
 #define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
-#define DEFAULT_FUNC_FILTER "!_*"
+#define DEFAULT_FUNC_FILTER "!_* | _Z*"
 #define DEFAULT_LIST_FILTER "*"
 
 /* Session management structure */
-- 
2.7.4