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Subject[PATCH v3 00/30] perf clang: Builtin clang and perfhook support
Date
This is version 3 of perf builtin clang and perfhook patch series.
Compare to v2 there is only minor changes:
1. BPF map helpers in perf hooks now called 'perf_map_...',
instead of 'jit_helper_map_...'.
(Alexei Starovoitov)
2. Rename bpf_map_{pin,get} to bpf_obj_{pin,get}, make them consist
with kernel.
(Joe Stringer).

Example in v2 should be changed accordingly:

$ cat ./count_syscalls.c
typedef unsigned long u64;

#define BPF_MAP_TYPE_HASH 1
#define BPF_MAP_TYPE_ARRAY 2

enum GVAL {
G_perf_pid,
NR_GVALS
};

struct bpf_map_def SEC("maps") GVALS = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(u64),
.max_entries = NR_GVALS,
};

struct bpf_map_def SEC("maps") syscall_counter = {
.type = BPF_MAP_TYPE_HASH,
.key_size = sizeof(u64),
.value_size = sizeof(u64),
.max_entries = 512,
};

SEC("raw_syscalls:sys_enter")
int func(void *ctx)
{
int key = G_perf_pid;
u64 id = *((u64 *)(ctx + 8));
int self_pid = bpf_get_current_pid_tgid() & 0xffffffff;
int *perf_pid = bpf_map_lookup_elem(&GVALS, &key);
u64 *counter;

if (!perf_pid)
return 0;
if (*perf_pid == self_pid)
return 0;
counter = bpf_map_lookup_elem(&syscall_counter, &id);
if (!counter) {
u64 value = 1;
bpf_map_update_elem(&syscall_counter, &id, &value, 0);
return 0;
}
__sync_fetch_and_add(counter, 1);
return 0;
}

SEC("perfhook:record_start")
void record_start(void *ctx)
{
int perf_pid = getpid(), key = G_perf_pid;
printf("Start count, perfpid=%d\n", perf_pid);
perf_map_update_elem(ctx, &GVALS, &key, &perf_pid, 0);
}

SEC("perfhook:record_end")
void record_end(void *ctx)
{
u64 key = -1, value;
while (!perf_map_get_next_key(ctx, &syscall_counter, &key, &key)) {
perf_map_lookup_elem(ctx, &syscall_counter, &key, &value);
printf("syscall %ld\tcount: %ld\n", (long)key, (long)value);
}
}
char _license[] SEC("license") = "GPL";
int _version SEC("version") = LINUX_VERSION_CODE;
$ sudo -s
# ulimit -l unlimited
# perf record -e ./count_syscalls.c echo "Haha"
Start count, perfpid=25209
Haha
[ perf record: Woken up 1 times to write data ]
syscall 293 count: 2
syscall 8 count: 7
syscall 11 count: 763
syscall 4 count: 43
syscall 21 count: 48
syscall 86 count: 1
syscall 5 count: 791
...

Wang Nan (30):
tools lib bpf: Add missing BPF functions
tools lib bpf: Add private field for bpf_object
tools lib bpf: Retrive bpf_map through offset of bpf_map_def
perf tools: Introduce perf hooks
perf tools: Pass context to perf hook functions
perf llvm: Extract helpers in llvm-utils.c
tools build: Add feature detection for LLVM
tools build: 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 clang: Compile BPF script use builtin clang support
perf clang: Pass full path to builtin clang
perf clang: Pass CFLAGS to builtin clang
perf clang jit: Wrap llvm::Module using PerfModule
perf clang jit: Insignt BPF and JIT functions in a Module
perf clang jit: add PerfModule::doJIT to JIT perfhook functions
perf clang jit: Export functions for jitted code
perf clang jit: Actually JIT and hook in bpf loader
perf clang jit: Collect the lowest address in maps section as map_base
perf clang jit: Retrive fd of BPF map from its offset
perf clang jit: Allow jitted perf hook access BPF maps
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 builtin: Define hook helpers by default
perf clang jit: Export getpid() to perf hook

tools/build/feature/Makefile | 18 +
tools/build/feature/test-clang.cpp | 21 ++
tools/build/feature/test-llvm.cpp | 8 +
tools/lib/bpf/bpf.c | 56 +++
tools/lib/bpf/bpf.h | 7 +
tools/lib/bpf/libbpf.c | 35 ++
tools/lib/bpf/libbpf.h | 13 +
tools/perf/Makefile.config | 62 +++-
tools/perf/Makefile.perf | 23 +-
tools/perf/builtin-record.c | 11 +
tools/perf/tests/Build | 4 +-
tools/perf/tests/bpf-script-example.c | 30 +-
tools/perf/tests/bpf-script-test-kbuild.c | 2 +
tools/perf/tests/bpf-script-test-prologue.c | 6 +-
tools/perf/tests/bpf-script-test-relocation.c | 17 +-
tools/perf/tests/builtin-test.c | 13 +
tools/perf/tests/clang.c | 50 +++
tools/perf/tests/llvm.h | 7 +
tools/perf/tests/make | 2 +
tools/perf/tests/perf-hooks.c | 48 +++
tools/perf/tests/tests.h | 4 +
tools/perf/util/Build | 5 +
tools/perf/util/bpf-loader.c | 102 +++++-
tools/perf/util/bpf-loader.h | 19 +
tools/perf/util/c++/Build | 4 +
tools/perf/util/c++/bpf-funcs-str.c | 228 ++++++++++++
tools/perf/util/c++/bpf-helper-str.c | 23 ++
tools/perf/util/c++/clang-bpf-includes.h | 13 +
tools/perf/util/c++/clang-c.h | 63 ++++
tools/perf/util/c++/clang-test.cpp | 99 +++++
tools/perf/util/c++/clang.cpp | 497 ++++++++++++++++++++++++++
tools/perf/util/c++/clang.h | 61 ++++
tools/perf/util/jit-helpers.c | 57 +++
tools/perf/util/jit-helpers.h | 28 ++
tools/perf/util/llvm-utils.c | 76 +++-
tools/perf/util/llvm-utils.h | 15 +-
tools/perf/util/perf-hooks-list.h | 3 +
tools/perf/util/perf-hooks.c | 88 +++++
tools/perf/util/perf-hooks.h | 39 ++
tools/perf/util/util-cxx.h | 26 ++
40 files changed, 1830 insertions(+), 53 deletions(-)
create mode 100644 tools/build/feature/test-clang.cpp
create mode 100644 tools/build/feature/test-llvm.cpp
create mode 100644 tools/perf/tests/clang.c
create mode 100644 tools/perf/tests/perf-hooks.c
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/jit-helpers.c
create mode 100644 tools/perf/util/jit-helpers.h
create mode 100644 tools/perf/util/perf-hooks-list.h
create mode 100644 tools/perf/util/perf-hooks.c
create mode 100644 tools/perf/util/perf-hooks.h
create mode 100644 tools/perf/util/util-cxx.h

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: Joe Stringer <joe@ovn.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com

--
2.10.1

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