linux-kernel - [PATCH 34/34] perf clang git: Export getpid() to perf hook

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Date:   Tue, 15 Nov 2016 04:06:17 +0000
From:   Wang Nan <wangnan0@...wei.com>
To:     <acme@...hat.com>, <ast@...com>
CC:     <lizefan@...wei.com>, <hekuang@...wei.com>,
        <linux-kernel@...r.kernel.org>, <pi3orama@....com>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>
Subject: [PATCH 34/34] perf clang git: Export getpid() to perf hook

After this patch perf hooks can retrive pid of perf itself by calling
getpid. It is important for excluding event from perf.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Alexei Starovoitov <ast@...com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
---
 tools/perf/util/c++/bpf-helper-str.c | 1 +
 tools/perf/util/c++/clang.cpp        | 1 +
 2 files changed, 2 insertions(+)

diff --git a/tools/perf/util/c++/bpf-helper-str.c b/tools/perf/util/c++/bpf-helper-str.c
index 69aca3c..eedee89 100644
--- a/tools/perf/util/c++/bpf-helper-str.c
+++ b/tools/perf/util/c++/bpf-helper-str.c
@@ -13,6 +13,7 @@ const char clang_builtin_bpf_helper_str[] =
 "extern void test__clang_callback(int);\n"
 "extern int printf(const char *, ...);\n"
 "extern int puts(const char *);\n"
+"extern int getpid(void);\n"
 "extern int jit_helper__map_update_elem(void *, void *, void *, void *, unsigned long);\n"
 "extern int jit_helper__map_lookup_elem(void *, void *, void *, void *);\n"
 "extern int jit_helper__map_get_next_key(void *, void *, void *, void *);\n"
diff --git a/tools/perf/util/c++/clang.cpp b/tools/perf/util/c++/clang.cpp
index db31fb2..d6af336 100644
--- a/tools/perf/util/c++/clang.cpp
+++ b/tools/perf/util/c++/clang.cpp
@@ -236,6 +236,7 @@ static std::map<const std::string, const void *> exported_funcs =
 	EXPORT(test__clang_callback),
 	EXPORT(printf),
 	EXPORT(puts),
+	EXPORT(getpid),
 	EXPORT(JIT_HELPER_FUNC_NAME(map_update_elem)),
 	EXPORT(JIT_HELPER_FUNC_NAME(map_lookup_elem)),
 	EXPORT(JIT_HELPER_FUNC_NAME(map_get_next_key)),
-- 
2.10.1