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Date: Tue, 23 Jul 2019 09:25:19 +0000
From: Song Liu <songliubraving@...com>
To: Andrii Nakryiko <andriin@...com>
CC: bpf <bpf@...r.kernel.org>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Alexei Starovoitov <ast@...com>,
"daniel@...earbox.net" <daniel@...earbox.net>,
"andrii.nakryiko@...il.com" <andrii.nakryiko@...il.com>,
Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH bpf-next 1/5] selftests/bpf: convert test_get_stack_raw_tp
to perf_buffer API
> On Jul 22, 2019, at 9:31 PM, Andrii Nakryiko <andriin@...com> wrote:
>
> Convert test_get_stack_raw_tp test to new perf_buffer API.
>
> Signed-off-by: Andrii Nakryiko <andriin@...com>
> ---
> .../bpf/prog_tests/get_stack_raw_tp.c | 78 ++++++++++---------
> .../bpf/progs/test_get_stack_rawtp.c | 2 +-
> 2 files changed, 44 insertions(+), 36 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c b/tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c
> index c2a0a9d5591b..473889e1b219 100644
> --- a/tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c
> +++ b/tools/testing/selftests/bpf/prog_tests/get_stack_raw_tp.c
> @@ -1,8 +1,15 @@
> // SPDX-License-Identifier: GPL-2.0
> +#define _GNU_SOURCE
> +#include <pthread.h>
> +#include <sched.h>
> +#include <sys/socket.h>
> #include <test_progs.h>
>
> #define MAX_CNT_RAWTP 10ull
> #define MAX_STACK_RAWTP 100
> +
> +static int duration = 0;
> +
Are we using "duration" at all?
> struct get_stack_trace_t {
> int pid;
> int kern_stack_size;
> @@ -13,7 +20,7 @@ struct get_stack_trace_t {
> struct bpf_stack_build_id user_stack_buildid[MAX_STACK_RAWTP];
> };
>
> -static int get_stack_print_output(void *data, int size)
> +static void get_stack_print_output(void *ctx, int cpu, void *data, __u32 size)
> {
> bool good_kern_stack = false, good_user_stack = false;
> const char *nonjit_func = "___bpf_prog_run";
> @@ -65,75 +72,76 @@ static int get_stack_print_output(void *data, int size)
> if (e->user_stack_size > 0 && e->user_stack_buildid_size > 0)
> good_user_stack = true;
> }
> - if (!good_kern_stack || !good_user_stack)
> - return LIBBPF_PERF_EVENT_ERROR;
>
> - if (cnt == MAX_CNT_RAWTP)
> - return LIBBPF_PERF_EVENT_DONE;
> -
> - return LIBBPF_PERF_EVENT_CONT;
> + if (!good_kern_stack)
> + CHECK(!good_kern_stack, "bad_kern_stack", "bad\n");
Two "bad" is a little weird. How about "kern stack", "bad"?
> + if (!good_user_stack)
> + CHECK(!good_user_stack, "bad_user_stack", "bad\n");
> }
>
> void test_get_stack_raw_tp(void)
> {
> const char *file = "./test_get_stack_rawtp.o";
> - int i, efd, err, prog_fd, pmu_fd, perfmap_fd;
> - struct perf_event_attr attr = {};
> + const char *prog_name = "raw_tracepoint/sys_enter";
> + int i, err, prog_fd, exp_cnt = MAX_CNT_RAWTP;
> + struct perf_buffer_opts pb_opts = {};
> + struct perf_buffer *pb = NULL;
> + struct bpf_link *link = NULL;
> struct timespec tv = {0, 10};
> - __u32 key = 0, duration = 0;
> + struct bpf_program *prog;
> struct bpf_object *obj;
> + struct bpf_map *map;
> + cpu_set_t cpu_set;
>
> err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd);
> if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno))
> return;
>
> - efd = bpf_raw_tracepoint_open("sys_enter", prog_fd);
> - if (CHECK(efd < 0, "raw_tp_open", "err %d errno %d\n", efd, errno))
> + prog = bpf_object__find_program_by_title(obj, prog_name);
> + if (CHECK(!prog, "find_probe", "prog '%s' not found\n", prog_name))
> goto close_prog;
>
> - perfmap_fd = bpf_find_map(__func__, obj, "perfmap");
> - if (CHECK(perfmap_fd < 0, "bpf_find_map", "err %d errno %d\n",
> - perfmap_fd, errno))
> + map = bpf_object__find_map_by_name(obj, "perfmap");
> + if (CHECK(!map, "bpf_find_map", "not found\n"))
> goto close_prog;
>
> err = load_kallsyms();
> if (CHECK(err < 0, "load_kallsyms", "err %d errno %d\n", err, errno))
> goto close_prog;
>
> - attr.sample_type = PERF_SAMPLE_RAW;
> - attr.type = PERF_TYPE_SOFTWARE;
> - attr.config = PERF_COUNT_SW_BPF_OUTPUT;
> - pmu_fd = syscall(__NR_perf_event_open, &attr, getpid()/*pid*/, -1/*cpu*/,
> - -1/*group_fd*/, 0);
> - if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", pmu_fd,
> - errno))
> + CPU_ZERO(&cpu_set);
> + CPU_SET(0, &cpu_set);
> + err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set);
> + if (CHECK(err, "set_affinity", "err %d, errno %d\n", err, errno))
> goto close_prog;
>
> - err = bpf_map_update_elem(perfmap_fd, &key, &pmu_fd, BPF_ANY);
> - if (CHECK(err < 0, "bpf_map_update_elem", "err %d errno %d\n", err,
> - errno))
> + link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
> + if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", PTR_ERR(link)))
> goto close_prog;
>
> - err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
> - if (CHECK(err < 0, "ioctl PERF_EVENT_IOC_ENABLE", "err %d errno %d\n",
> - err, errno))
> - goto close_prog;
> -
> - err = perf_event_mmap(pmu_fd);
> - if (CHECK(err < 0, "perf_event_mmap", "err %d errno %d\n", err, errno))
> + pb_opts.sample_cb = get_stack_print_output;
> + pb = perf_buffer__new(bpf_map__fd(map), 8, &pb_opts);
> + if (CHECK(IS_ERR(pb), "perf_buf__new", "err %ld\n", PTR_ERR(pb)))
> goto close_prog;
>
> /* trigger some syscall action */
> for (i = 0; i < MAX_CNT_RAWTP; i++)
> nanosleep(&tv, NULL);
>
> - err = perf_event_poller(pmu_fd, get_stack_print_output);
> - if (CHECK(err < 0, "perf_event_poller", "err %d errno %d\n", err, errno))
> - goto close_prog;
> + while (exp_cnt > 0) {
> + err = perf_buffer__poll(pb, 100);
> + if (err < 0 && CHECK(err < 0, "pb__poll", "err %d\n", err))
> + goto close_prog;
> + exp_cnt -= err;
> + }
>
> goto close_prog_noerr;
> close_prog:
> error_cnt++;
> close_prog_noerr:
> + if (!IS_ERR_OR_NULL(link))
> + bpf_link__destroy(link);
> + if (!IS_ERR_OR_NULL(pb))
> + perf_buffer__free(pb);
> bpf_object__close(obj);
> }
> diff --git a/tools/testing/selftests/bpf/progs/test_get_stack_rawtp.c b/tools/testing/selftests/bpf/progs/test_get_stack_rawtp.c
> index 33254b771384..f8ffa3f3d44b 100644
> --- a/tools/testing/selftests/bpf/progs/test_get_stack_rawtp.c
> +++ b/tools/testing/selftests/bpf/progs/test_get_stack_rawtp.c
> @@ -55,7 +55,7 @@ struct {
> __type(value, raw_stack_trace_t);
> } rawdata_map SEC(".maps");
>
> -SEC("tracepoint/raw_syscalls/sys_enter")
> +SEC("raw_tracepoint/sys_enter")
> int bpf_prog1(void *ctx)
> {
> int max_len, max_buildid_len, usize, ksize, total_size;
> --
> 2.17.1
>
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