From: Wang Nan <wangnan0@huawei.com>
To: <acme@kernel.org>
Cc: <linux-kernel@vger.kernel.org>, <joe@ovn.org>,
Wang Nan <wangnan0@huawei.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
"Alexei Starovoitov" <ast@fb.com>, He Kuang <hekuang@huawei.com>,
Jiri Olsa <jolsa@kernel.org>, Zefan Li <lizefan@huawei.com>,
<pi3orama@163.com>
Subject: [PATCH v4 18/18] perf clang jit: Export getpid() to perf hook
Date: Tue, 6 Dec 2016 07:13:56 +0000 [thread overview]
Message-ID: <20161206071356.5312-19-wangnan0@huawei.com> (raw)
In-Reply-To: <20161206071356.5312-1-wangnan0@huawei.com>
After this patch perf hooks can retrive pid of perf itself by calling
getpid. It is important for excluding event from perf.
This commit is also an example to show how to export more helpers to
hooked script.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.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 f4d6d57..1ad6ec0 100644
--- a/tools/perf/util/c++/bpf-helper-str.c
+++ b/tools/perf/util/c++/bpf-helper-str.c
@@ -12,6 +12,7 @@ const char clang_builtin_bpf_helper_str[] =
"#define SEC(NAME) __attribute__((section(NAME), used))\n"
"extern int printf(const char *, ...);\n"
"extern int puts(const char *);\n"
+"extern int getpid(void);\n"
"extern int perf_map_update_elem(void *, void *, void *, void *, unsigned long);\n"
"extern int perf_map_lookup_elem(void *, void *, void *, void *);\n"
"extern int perf_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 d49305a..ca5264c 100644
--- a/tools/perf/util/c++/clang.cpp
+++ b/tools/perf/util/c++/clang.cpp
@@ -239,6 +239,7 @@ 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
prev parent reply other threads:[~2016-12-06 7:16 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-06 7:13 [PATCH v4 00/18] perf clang: Builtin clang and perfhook support Wang Nan
2016-12-06 7:13 ` [PATCH v4 01/18] perf build: Check LLVM version in feature check Wang Nan
2016-12-06 7:20 ` Wangnan (F)
2016-12-06 7:22 ` [PATCH v4 01/18 -cleanup] " Wang Nan
2016-12-06 14:02 ` Arnaldo Carvalho de Melo
2016-12-07 18:22 ` [tip:perf/core] " tip-bot for Wang Nan
2016-12-06 7:13 ` [PATCH v4 02/18] perf build: Support dynamic linking clang libraries Wang Nan
2016-12-06 7:13 ` [PATCH v4 03/18] perf clang: Cleanup clang options Wang Nan
2016-12-06 7:13 ` [PATCH v4 04/18] perf clang: Pass full path to builtin clang Wang Nan
2016-12-06 7:13 ` [PATCH v4 05/18] perf clang: Pass CFLAGS " Wang Nan
2016-12-06 7:13 ` [PATCH v4 06/18] perf clang jit: Wrap llvm::Module using PerfModule Wang Nan
2016-12-06 7:13 ` [PATCH v4 07/18] perf clang jit: Insignt BPF and JIT functions in a Module Wang Nan
2016-12-06 7:13 ` [PATCH v4 08/18] perf clang jit: add PerfModule::doJIT to JIT perfhook functions Wang Nan
2016-12-06 7:13 ` [PATCH v4 09/18] perf clang jit: Export functions for jitted code Wang Nan
2016-12-06 7:13 ` [PATCH v4 10/18] perf clang jit: Actually JIT and hook in bpf loader Wang Nan
2016-12-06 7:13 ` [PATCH v4 11/18] perf clang jit: Collect the lowest address in maps section as map_base Wang Nan
2016-12-06 7:13 ` [PATCH v4 12/18] perf clang jit: Retrive fd of BPF map from its offset Wang Nan
2016-12-06 7:13 ` [PATCH v4 13/18] perf clang jit: Allow jitted perf hook access BPF maps Wang Nan
2016-12-06 7:13 ` [PATCH v4 14/18] perf clang: Link BPF functions declaration into perf Wang Nan
2016-12-06 7:13 ` [PATCH v4 15/18] perf clang: Declare BPF functions for BPF scripts automatically Wang Nan
2016-12-06 7:13 ` [PATCH v4 16/18] perf clang: Include helpers to BPF scripts Wang Nan
2016-12-06 7:13 ` [PATCH v4 17/18] perf clang builtin: Define hook helpers by default Wang Nan
2016-12-06 7:13 ` Wang Nan [this message]
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