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Subject[PATCH v2 00/18] perf clang: Support compiling BPF script on the fly
Date
This patch add builtin clang, allow perf compile BPF scripts on the fly.
This is the first step to implement what I announced at LinuxCon 2016 NA:

http://events.linuxfoundation.org/sites/events/files/slides/Performance%20Monitoring%20and%20Analysis%20Using%20perf%20and%20BPF_1.pdf

Compare with v1:
1. Fix API usage so can be built at Ubuntu 16.04 (with llvm-dev and
libclang-dev installed)
2. Introduce default include files so BPF script writer doesn't need
define many BPF functions by their own.

Test:

# cat ./test_bpf_output.c
/************************ BEGIN **************************/
#include <uapi/linux/bpf.h>
struct bpf_map_def SEC("maps") __bpf_stdout__ = {
.type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(u32),
.max_entries = __NR_CPUS__,
};

static inline int __attribute__((always_inline))
func(void *ctx, int type)
{
char output_str[] = "Raise a BPF event!";

bpf_perf_event_output(ctx, &__bpf_stdout__, bpf_get_smp_processor_id(),
&output_str, sizeof(output_str));
return 0;
}
SEC("func_begin=sys_nanosleep")
int func_begin(void *ctx) {return func(ctx, 1);}
SEC("func_end=sys_nanosleep%return")
int func_end(void *ctx) { return func(ctx, 2);}
char _license[] SEC("license") = "GPL";
int _version SEC("version") = LINUX_VERSION_CODE;
/************************* END ***************************/
# perf trace --event ./test_bpf_output.c usleep 10
...
0.449 ( 0.002 ms): usleep/827 getuid( ) = 0
0.482 ( 0.006 ms): usleep/827 nanosleep(rqtp: 0x7ffecc22fa50 ) ...
0.482 ( ): __bpf_stdout__:Raise a BPF event!..)
0.555 ( ): __bpf_stdout__:Raise a BPF event!..)
0.557 ( 0.081 ms): usleep/827 ... [continued]: nanosleep() = 0
0.562 ( 0.000 ms): usleep/827 exit_group( )


v1 can be found at:
https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1238358.html
(should be http://lkml.kernel.org/g/1474635001-153850-1-git-send-email-wangnan0@huawei.com
but the link is broken)

Wang Nan (18):
tools build: Support compiling C++ source file
perf tools: Add feature detection for g++
perf tools: Add feature detection for LLVM
perf tools: Add feature detection for clang
perf build: Add clang and llvm compile and linking support
perf clang: Add builtin clang support ant test case
perf clang: Use real file system for #include
perf clang: Allow passing CFLAGS to builtin clang
perf clang: Update test case to use real BPF script
perf clang: Support compile IR to BPF object and add testcase
perf tools: Extract helpers in llvm-utils.c
perf bpf: Compile BPF script use builtin clang support
perf clang: Pass full path to builtin clang
perf clang: Pass CFLAGS to builtin clang
perf clang: Link BPF functions declaration into perf
perf clang: Declare BPF functions for BPF scripts automatically
perf clang: Include helpers to BPF scripts
perf clang: Define PERF_BUILTIN_CLANG for builtin clang compiling

tools/build/Build.include | 1 +
tools/build/Makefile.build | 7 +
tools/build/Makefile.feature | 2 +-
tools/build/feature/Makefile | 28 ++-
tools/build/feature/test-clang.cpp | 21 ++
tools/build/feature/test-cxx.cpp | 15 ++
tools/build/feature/test-llvm.cpp | 8 +
tools/perf/Makefile.config | 62 ++++-
tools/perf/Makefile.perf | 23 +-
tools/perf/tests/Build | 1 +
tools/perf/tests/bpf-script-example.c | 20 +-
tools/perf/tests/bpf-script-test-kbuild.c | 2 +
tools/perf/tests/bpf-script-test-prologue.c | 4 +
tools/perf/tests/bpf-script-test-relocation.c | 20 +-
tools/perf/tests/builtin-test.c | 9 +
tools/perf/tests/clang.c | 46 ++++
tools/perf/tests/llvm-cxx.h | 13 +
tools/perf/tests/make | 2 +
tools/perf/tests/tests.h | 3 +
tools/perf/util/Build | 2 +
tools/perf/util/bpf-loader.c | 15 +-
tools/perf/util/c++/Build | 4 +
tools/perf/util/c++/bpf-funcs-str.c | 214 +++++++++++++++++
tools/perf/util/c++/bpf-helper-str.c | 13 +
tools/perf/util/c++/clang-bpf-includes.h | 13 +
tools/perf/util/c++/clang-c.h | 43 ++++
tools/perf/util/c++/clang-test.cpp | 62 +++++
tools/perf/util/c++/clang.cpp | 329 ++++++++++++++++++++++++++
tools/perf/util/c++/clang.h | 26 ++
tools/perf/util/llvm-utils-cxx.h | 14 ++
tools/perf/util/llvm-utils.c | 70 +++++-
tools/perf/util/llvm-utils.h | 7 +-
tools/perf/util/util-cxx.h | 26 ++
33 files changed, 1078 insertions(+), 47 deletions(-)
create mode 100644 tools/build/feature/test-clang.cpp
create mode 100644 tools/build/feature/test-cxx.cpp
create mode 100644 tools/build/feature/test-llvm.cpp
create mode 100644 tools/perf/tests/clang.c
create mode 100644 tools/perf/tests/llvm-cxx.h
create mode 100644 tools/perf/util/c++/Build
create mode 100644 tools/perf/util/c++/bpf-funcs-str.c
create mode 100644 tools/perf/util/c++/bpf-helper-str.c
create mode 100644 tools/perf/util/c++/clang-bpf-includes.h
create mode 100644 tools/perf/util/c++/clang-c.h
create mode 100644 tools/perf/util/c++/clang-test.cpp
create mode 100644 tools/perf/util/c++/clang.cpp
create mode 100644 tools/perf/util/c++/clang.h
create mode 100644 tools/perf/util/llvm-utils-cxx.h
create mode 100644 tools/perf/util/util-cxx.h

Cc: 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>
--
1.8.3.4

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