diff options
Diffstat (limited to 'tools/testing/selftests/bpf/prog_tests/test_overhead.c')
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/test_overhead.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/test_overhead.c b/tools/testing/selftests/bpf/prog_tests/test_overhead.c new file mode 100644 index 000000000000..c32aa28bd93f --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/test_overhead.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2019 Facebook */ +#define _GNU_SOURCE +#include <sched.h> +#include <test_progs.h> + +#define MAX_CNT 100000 + +static __u64 time_get_ns(void) +{ + struct timespec ts; + + clock_gettime(CLOCK_MONOTONIC, &ts); + return ts.tv_sec * 1000000000ull + ts.tv_nsec; +} + +static int test_task_rename(const char *prog) +{ + int i, fd, duration = 0, err; + char buf[] = "test\n"; + __u64 start_time; + + fd = open("/proc/self/comm", O_WRONLY|O_TRUNC); + if (CHECK(fd < 0, "open /proc", "err %d", errno)) + return -1; + start_time = time_get_ns(); + for (i = 0; i < MAX_CNT; i++) { + err = write(fd, buf, sizeof(buf)); + if (err < 0) { + CHECK(err < 0, "task rename", "err %d", errno); + close(fd); + return -1; + } + } + printf("task_rename %s\t%lluK events per sec\n", prog, + MAX_CNT * 1000000ll / (time_get_ns() - start_time)); + close(fd); + return 0; +} + +static void test_run(const char *prog) +{ + test_task_rename(prog); +} + +static void setaffinity(void) +{ + cpu_set_t cpuset; + int cpu = 0; + + CPU_ZERO(&cpuset); + CPU_SET(cpu, &cpuset); + sched_setaffinity(0, sizeof(cpuset), &cpuset); +} + +void test_test_overhead(void) +{ + const char *kprobe_name = "kprobe/__set_task_comm"; + const char *kretprobe_name = "kretprobe/__set_task_comm"; + const char *raw_tp_name = "raw_tp/task_rename"; + const char *fentry_name = "fentry/__set_task_comm"; + const char *fexit_name = "fexit/__set_task_comm"; + const char *kprobe_func = "__set_task_comm"; + struct bpf_program *kprobe_prog, *kretprobe_prog, *raw_tp_prog; + struct bpf_program *fentry_prog, *fexit_prog; + struct bpf_object *obj; + struct bpf_link *link; + int err, duration = 0; + + obj = bpf_object__open_file("./test_overhead.o", NULL); + if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj))) + return; + + kprobe_prog = bpf_object__find_program_by_title(obj, kprobe_name); + if (CHECK(!kprobe_prog, "find_probe", + "prog '%s' not found\n", kprobe_name)) + goto cleanup; + kretprobe_prog = bpf_object__find_program_by_title(obj, kretprobe_name); + if (CHECK(!kretprobe_prog, "find_probe", + "prog '%s' not found\n", kretprobe_name)) + goto cleanup; + raw_tp_prog = bpf_object__find_program_by_title(obj, raw_tp_name); + if (CHECK(!raw_tp_prog, "find_probe", + "prog '%s' not found\n", raw_tp_name)) + goto cleanup; + fentry_prog = bpf_object__find_program_by_title(obj, fentry_name); + if (CHECK(!fentry_prog, "find_probe", + "prog '%s' not found\n", fentry_name)) + goto cleanup; + fexit_prog = bpf_object__find_program_by_title(obj, fexit_name); + if (CHECK(!fexit_prog, "find_probe", + "prog '%s' not found\n", fexit_name)) + goto cleanup; + + err = bpf_object__load(obj); + if (CHECK(err, "obj_load", "err %d\n", err)) + goto cleanup; + + setaffinity(); + + /* base line run */ + test_run("base"); + + /* attach kprobe */ + link = bpf_program__attach_kprobe(kprobe_prog, false /* retprobe */, + kprobe_func); + if (CHECK(IS_ERR(link), "attach_kprobe", "err %ld\n", PTR_ERR(link))) + goto cleanup; + test_run("kprobe"); + bpf_link__destroy(link); + + /* attach kretprobe */ + link = bpf_program__attach_kprobe(kretprobe_prog, true /* retprobe */, + kprobe_func); + if (CHECK(IS_ERR(link), "attach kretprobe", "err %ld\n", PTR_ERR(link))) + goto cleanup; + test_run("kretprobe"); + bpf_link__destroy(link); + + /* attach raw_tp */ + link = bpf_program__attach_raw_tracepoint(raw_tp_prog, "task_rename"); + if (CHECK(IS_ERR(link), "attach fentry", "err %ld\n", PTR_ERR(link))) + goto cleanup; + test_run("raw_tp"); + bpf_link__destroy(link); + + /* attach fentry */ + link = bpf_program__attach_trace(fentry_prog); + if (CHECK(IS_ERR(link), "attach fentry", "err %ld\n", PTR_ERR(link))) + goto cleanup; + test_run("fentry"); + bpf_link__destroy(link); + + /* attach fexit */ + link = bpf_program__attach_trace(fexit_prog); + if (CHECK(IS_ERR(link), "attach fexit", "err %ld\n", PTR_ERR(link))) + goto cleanup; + test_run("fexit"); + bpf_link__destroy(link); +cleanup: + bpf_object__close(obj); +} |