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Groups > linux.kernel > #1215188
| From | Wang Nan <wangnan0@huawei.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 18/32] perf test: Add 'perf test BPF' |
| Date | 2015-08-28 09:20 +0200 |
| Message-ID | <q2m79-4Ey-45@gated-at.bofh.it> (permalink) |
| References | <q2lXr-4sW-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
This patch adds BPF testcase for testing BPF event filtering.
By utilizing the result of 'perf test LLVM', this patch compiles the
eBPF sample program then test it ability. The BPF script in 'perf test
LLVM' collects half of execution of epoll_pwait(). This patch runs 111
times of it, so the resule should contains 56 samples.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: David Ahern <dsahern@gmail.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kaixu Xia <xiakaixu@huawei.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/n/1440151770-129878-16-git-send-email-wangnan0@huawei.com
---
tools/perf/tests/Build | 1 +
tools/perf/tests/bpf.c | 170 ++++++++++++++++++++++++++++++++++++++++
tools/perf/tests/builtin-test.c | 4 +
tools/perf/tests/llvm.c | 19 +++++
tools/perf/tests/llvm.h | 1 +
tools/perf/tests/tests.h | 1 +
tools/perf/util/bpf-loader.c | 14 ++++
tools/perf/util/bpf-loader.h | 8 ++
8 files changed, 218 insertions(+)
create mode 100644 tools/perf/tests/bpf.c
diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index 8c98409..7ceb448 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -33,6 +33,7 @@ perf-y += parse-no-sample-id-all.o
perf-y += kmod-path.o
perf-y += thread-map.o
perf-y += llvm.o llvm-src.o
+perf-y += bpf.o
$(OUTPUT)tests/llvm-src.c: tests/bpf-script-example.c
$(Q)echo '#include <tests/llvm.h>' > $@
diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
new file mode 100644
index 0000000..6c238ca
--- /dev/null
+++ b/tools/perf/tests/bpf.c
@@ -0,0 +1,170 @@
+#include <stdio.h>
+#include <sys/epoll.h>
+#include <util/bpf-loader.h>
+#include <util/evlist.h>
+#include "tests.h"
+#include "llvm.h"
+#include "debug.h"
+#define NR_ITERS 111
+
+#ifdef HAVE_LIBBPF_SUPPORT
+
+static int epoll_pwait_loop(void)
+{
+ int i;
+
+ /* Should fail NR_ITERS times */
+ for (i = 0; i < NR_ITERS; i++)
+ epoll_pwait(-(i + 1), NULL, 0, 0, NULL);
+ return 0;
+}
+
+static int prepare_bpf(void *obj_buf, size_t obj_buf_sz)
+{
+ int err;
+ char errbuf[BUFSIZ];
+
+ err = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, NULL);
+ if (err) {
+ bpf__strerror_prepare_load("[buffer]", false, err, errbuf,
+ sizeof(errbuf));
+ fprintf(stderr, " (%s)", errbuf);
+ return TEST_FAIL;
+ }
+
+ err = bpf__probe();
+ if (err) {
+ bpf__strerror_load(err, errbuf, sizeof(errbuf));
+ fprintf(stderr, " (%s)", errbuf);
+ if (getuid() != 0)
+ fprintf(stderr, " (try run as root)");
+ return TEST_FAIL;
+ }
+
+ err = bpf__load();
+ if (err) {
+ bpf__strerror_load(err, errbuf, sizeof(errbuf));
+ fprintf(stderr, " (%s)", errbuf);
+ return TEST_FAIL;
+ }
+
+ return 0;
+}
+
+static int do_test(void)
+{
+ struct record_opts opts = {
+ .target = {
+ .uid = UINT_MAX,
+ .uses_mmap = true,
+ },
+ .freq = 0,
+ .mmap_pages = 256,
+ .default_interval = 1,
+ };
+
+ int err, i, count = 0;
+ char pid[16];
+ char sbuf[STRERR_BUFSIZE];
+ struct perf_evlist *evlist;
+
+ snprintf(pid, sizeof(pid), "%d", getpid());
+ pid[sizeof(pid) - 1] = '\0';
+ opts.target.tid = opts.target.pid = pid;
+
+ /* Instead of perf_evlist__new_default, don't add default events */
+ evlist = perf_evlist__new();
+ if (!evlist) {
+ pr_debug("No ehough memory to create evlist\n");
+ return -ENOMEM;
+ }
+
+ err = perf_evlist__create_maps(evlist, &opts.target);
+ if (err < 0) {
+ pr_debug("Not enough memory to create thread/cpu maps\n");
+ goto out_delete_evlist;
+ }
+
+ err = perf_evlist__add_bpf(evlist);
+ if (err) {
+ fprintf(stderr, " (Failed to add events selected by BPF)");
+ goto out_delete_evlist;
+ }
+
+ perf_evlist__config(evlist, &opts);
+
+ err = perf_evlist__open(evlist);
+ if (err < 0) {
+ pr_debug("perf_evlist__open: %s\n",
+ strerror_r(errno, sbuf, sizeof(sbuf)));
+ goto out_delete_evlist;
+ }
+
+ err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
+ if (err < 0) {
+ pr_debug("perf_evlist__mmap: %s\n",
+ strerror_r(errno, sbuf, sizeof(sbuf)));
+ goto out_delete_evlist;
+ }
+
+ perf_evlist__enable(evlist);
+ epoll_pwait_loop();
+ perf_evlist__disable(evlist);
+
+ for (i = 0; i < evlist->nr_mmaps; i++) {
+ union perf_event *event;
+
+ while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
+ const u32 type = event->header.type;
+
+ if (type == PERF_RECORD_SAMPLE)
+ count ++;
+ }
+ }
+
+ if (count != (NR_ITERS + 1) / 2) {
+ fprintf(stderr, " (filter result incorrect)");
+ err = -EBADF;
+ }
+
+out_delete_evlist:
+ perf_evlist__delete(evlist);
+ if (err)
+ return TEST_FAIL;
+ return 0;
+}
+
+int test__bpf(void)
+{
+ int err;
+ void *obj_buf;
+ size_t obj_buf_sz;
+
+ test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz);
+ if (!obj_buf || !obj_buf_sz) {
+ if (verbose == 0)
+ fprintf(stderr, " (fix 'perf test LLVM' first)");
+ return TEST_SKIP;
+ }
+
+ err = prepare_bpf(obj_buf, obj_buf_sz);
+ if (err)
+ goto out;
+
+ err = do_test();
+ if (err)
+ goto out;
+out:
+ bpf__unprobe();
+ bpf__clear();
+ if (err)
+ return TEST_FAIL;
+ return 0;
+}
+
+#else
+int test__bpf(void)
+{
+ return TEST_SKIP;
+}
+#endif
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index 1a349e8..c32c836 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -183,6 +183,10 @@ static struct test {
.cleanup = test__llvm_cleanup,
},
{
+ .desc = "Test BPF filter",
+ .func = test__bpf,
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/llvm.c b/tools/perf/tests/llvm.c
index 236bf39..fd5fdb0 100644
--- a/tools/perf/tests/llvm.c
+++ b/tools/perf/tests/llvm.c
@@ -174,3 +174,22 @@ void test__llvm_cleanup(void)
(~((unsigned long)page_size - 1));
munmap((void *)boundary, buf_end - boundary);
}
+
+void
+test_llvm__fetch_bpf_obj(void **p_obj_buf, size_t *p_obj_buf_sz)
+{
+ *p_obj_buf = NULL;
+ *p_obj_buf_sz = 0;
+
+ if (!p_test_llvm__bpf_result) {
+ test__llvm_prepare();
+ test__llvm();
+ test__llvm_cleanup();
+ }
+
+ if (!p_test_llvm__bpf_result)
+ return;
+
+ *p_obj_buf = p_test_llvm__bpf_result->object;
+ *p_obj_buf_sz = p_test_llvm__bpf_result->size;
+}
diff --git a/tools/perf/tests/llvm.h b/tools/perf/tests/llvm.h
index 1e89e46..2fd7ed6 100644
--- a/tools/perf/tests/llvm.h
+++ b/tools/perf/tests/llvm.h
@@ -10,5 +10,6 @@ struct test_llvm__bpf_result {
extern struct test_llvm__bpf_result *p_test_llvm__bpf_result;
extern const char test_llvm__bpf_prog[];
+void test_llvm__fetch_bpf_obj(void **p_obj_buf, size_t *p_obj_buf_sz);
#endif
diff --git a/tools/perf/tests/tests.h b/tools/perf/tests/tests.h
index 0d79f04..f8ded73 100644
--- a/tools/perf/tests/tests.h
+++ b/tools/perf/tests/tests.h
@@ -65,6 +65,7 @@ int test__thread_map(void);
int test__llvm(void);
void test__llvm_prepare(void);
void test__llvm_cleanup(void);
+int test__bpf(void);
#if defined(__x86_64__) || defined(__i386__) || defined(__arm__) || defined(__aarch64__)
#ifdef HAVE_DWARF_UNWIND_SUPPORT
diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index c2aafe2..95e529b 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -153,6 +153,20 @@ sync_bpf_program_pev(struct bpf_program *prog)
return 0;
}
+int bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz,
+ const char *name)
+{
+ struct bpf_object *obj;
+
+ obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
+ if (!obj) {
+ pr_debug("bpf: failed to load buffer\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
int bpf__prepare_load(const char *filename, bool source)
{
struct bpf_object *obj;
diff --git a/tools/perf/util/bpf-loader.h b/tools/perf/util/bpf-loader.h
index 97aed65..dead4d4 100644
--- a/tools/perf/util/bpf-loader.h
+++ b/tools/perf/util/bpf-loader.h
@@ -19,6 +19,8 @@ typedef int (*bpf_prog_iter_callback_t)(struct probe_trace_event *tev,
#ifdef HAVE_LIBBPF_SUPPORT
int bpf__prepare_load(const char *filename, bool source);
+int bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz,
+ const char *name);
int bpf__strerror_prepare_load(const char *filename, bool source,
int err, char *buf, size_t size);
int bpf__probe(void);
@@ -39,6 +41,12 @@ static inline int bpf__prepare_load(const char *filename __maybe_unused,
return -1;
}
+static inline int bpf__prepare_load_buffer(void *obj_buf __maybe_unused,
+ size_t obj_buf_sz __maybe_unused)
+{
+ return bpf__prepare_load(NULL, false);
+}
+
static inline int bpf__probe(void) { return 0; }
static inline int bpf__unprobe(void) { return 0; }
static inline int bpf__load(void) { return 0; }
--
2.1.0
--
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[GIT PULL 00/32] perf tools: filtering events using eBPF programs Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:10 +0200
[PATCH 11/32] perf tools: Add bpf_fd field to evsel and config it Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 03/32] perf tools: Introduce dummy evsel Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 14/32] perf tools: Suppress probing messages when probing by BPF loading Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 07/32] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 08/32] perf record, bpf: Parse and probe eBPF programs probe points Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 02/32] perf tools: Don't set cmdline_group_boundary if no evsel is collected Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 28/32] perf record: Support custom vmlinux path Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 12/32] perf tools: Allow filter option to be applied to bof object Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 27/32] perf tools: Use same BPF program if arguments are identical Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 04/32] perf tools: Make perf depend on libbpf Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 09/32] perf bpf: Collect 'struct perf_probe_event' for bpf_program Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 21/32] perf probe: Reset args and nargs for probe_trace_event when failure Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 16/32] perf tools: Infrastructure for compiling scriptlets when passing '.c' to --event Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 24/32] perf tools: Introduce arch_get_reg_info() for x86 Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 15/32] perf record: Add clang options for compiling BPF scripts Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 18/32] perf test: Add 'perf test BPF' Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 19/32] bpf tools: Load a program with different instances using preprocessor Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 13/32] perf tools: Attach eBPF program to perf event Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
[PATCH 05/32] perf ebpf: Add the libbpf glue Wang Nan <wangnan0@huawei.com> - 2015-08-28 09:20 +0200
Re: [GIT PULL 00/32] perf tools: filtering events using eBPF programs Alexei Starovoitov <ast@plumgrid.com> - 2015-08-29 02:30 +0200
Re: [GIT PULL 00/32] perf tools: filtering events using eBPF programs Arnaldo Carvalho de Melo <acme@redhat.com> - 2015-08-31 16:00 +0200
Re: [GIT PULL 00/32] perf tools: filtering events using eBPF programs "Wangnan (F)" <wangnan0@huawei.com> - 2015-08-31 16:20 +0200
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