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Groups > linux.kernel > #1211105
| From | Wang Nan <wangnan0@huawei.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 15/29] perf test: Add 'perf test BPF' |
| Date | 2015-08-21 12:20 +0200 |
| Message-ID | <pZRAx-DT-101@gated-at.bofh.it> (permalink) |
| References | <pZRAt-DT-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
---
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 | 13 +++
tools/perf/util/bpf-loader.h | 7 ++
8 files changed, 216 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..1b0ee4e
--- /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);
+ 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 e48eb64..94ed5f2 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 5a203ae..f4693b6 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -153,6 +153,19 @@ sync_bpf_program_pev(struct bpf_program *prog)
return 0;
}
+int bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz)
+{
+ struct bpf_object *obj;
+
+ obj = bpf_object__open_buffer(obj_buf, obj_buf_sz);
+ 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 c55ffde..3a86209 100644
--- a/tools/perf/util/bpf-loader.h
+++ b/tools/perf/util/bpf-loader.h
@@ -17,6 +17,7 @@ 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);
int bpf__strerror_prepare_load(const char *filename, bool source,
int err, char *buf, size_t size);
int bpf__probe(void);
@@ -37,6 +38,12 @@ 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 00/29] perf tools: filtering events using eBPF programs Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 25/29] perf record: Support custom vmlinux path Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 14/29] perf tests: Enforce LLVM test for BPF test Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 18/29] perf probe: Reset args and nargs for probe_trace_event when failure Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 11/29] perf tools: Suppress probing messages when probing by BPF loading Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 13/29] perf tools: Infrastructure for compiling scriptlets when passing '.c' to --event Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 19/29] perf tools: Move linux/filter.h to tools/include Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 05/29] perf probe: Attach trace_probe_event with perf_probe_event Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 21/29] perf tools: Introduce arch_get_reg_info() for x86 Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 03/29] perf ebpf: Add the libbpf glue Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 10/29] perf tools: Attach eBPF program to perf event Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 01/29] perf probe: Try to use symbol table if searching debug info failed Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
Re: [PATCH 01/29] perf probe: Try to use symbol table if searching debug info failed Arnaldo Carvalho de Melo <acme@redhat.com> - 2015-08-21 16:20 +0200
[tip:perf/core] perf probe: Try to use symbol table if searching debug info failed tip-bot for Wang Nan <tipbot@zytor.com> - 2015-08-22 09:00 +0200
[PATCH 16/29] bpf tools: Load a program with different instances using preprocessor Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 07/29] perf bpf: Collect 'struct perf_probe_event' for bpf_program Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 04/29] perf tools: Enable passing bpf object file to --event Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 20/29] perf tools: Add BPF_PROLOGUE config options for further patches Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 24/29] perf tools: Use same BPF program if arguments are identical Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 23/29] perf tools: Generate prologue for BPF programs Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 02/29] perf tools: Make perf depend on libbpf Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 29/29] bpf: Introduce function for outputing data to perf event Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 12/29] perf record: Add clang options for compiling BPF scripts Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 06/29] perf record, bpf: Parse and probe eBPF programs probe points Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 27/29] perf tools: Support attach BPF program on uprobe events Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 17/29] perf tools: Fix probe-event.h include Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 28/29] tools lib traceevent: Support function __get_dynamic_array_len Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
Re: [PATCH 28/29] tools lib traceevent: Support function __get_dynamic_array_len Arnaldo Carvalho de Melo <acme@redhat.com> - 2015-08-21 18:10 +0200
[PATCH 15/29] perf test: Add 'perf test BPF' Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:20 +0200
[PATCH 08/29] perf record: Load all eBPF object into kernel Wang Nan <wangnan0@huawei.com> - 2015-08-21 12:30 +0200
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