149 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* Copyright (c) 2019 Facebook */3#define _GNU_SOURCE4#include <sched.h>5#include <sys/prctl.h>6#include <test_progs.h>7 8#define MAX_CNT 1000009 10static __u64 time_get_ns(void)11{12 struct timespec ts;13 14 clock_gettime(CLOCK_MONOTONIC, &ts);15 return ts.tv_sec * 1000000000ull + ts.tv_nsec;16}17 18static int test_task_rename(const char *prog)19{20 int i, fd, duration = 0, err;21 char buf[] = "test_overhead";22 __u64 start_time;23 24 fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);25 if (CHECK(fd < 0, "open /proc", "err %d", errno))26 return -1;27 start_time = time_get_ns();28 for (i = 0; i < MAX_CNT; i++) {29 err = write(fd, buf, sizeof(buf));30 if (err < 0) {31 CHECK(err < 0, "task rename", "err %d", errno);32 close(fd);33 return -1;34 }35 }36 printf("task_rename %s\t%lluK events per sec\n", prog,37 MAX_CNT * 1000000ll / (time_get_ns() - start_time));38 close(fd);39 return 0;40}41 42static void test_run(const char *prog)43{44 test_task_rename(prog);45}46 47static void setaffinity(void)48{49 cpu_set_t cpuset;50 int cpu = 0;51 52 CPU_ZERO(&cpuset);53 CPU_SET(cpu, &cpuset);54 sched_setaffinity(0, sizeof(cpuset), &cpuset);55}56 57void test_test_overhead(void)58{59 const char *kprobe_name = "prog1";60 const char *kretprobe_name = "prog2";61 const char *raw_tp_name = "prog3";62 const char *fentry_name = "prog4";63 const char *fexit_name = "prog5";64 const char *kprobe_func = "__set_task_comm";65 struct bpf_program *kprobe_prog, *kretprobe_prog, *raw_tp_prog;66 struct bpf_program *fentry_prog, *fexit_prog;67 struct bpf_object *obj;68 struct bpf_link *link;69 int err, duration = 0;70 char comm[16] = {};71 72 if (CHECK_FAIL(prctl(PR_GET_NAME, comm, 0L, 0L, 0L)))73 return;74 75 obj = bpf_object__open_file("./test_overhead.bpf.o", NULL);76 if (!ASSERT_OK_PTR(obj, "obj_open_file"))77 return;78 79 kprobe_prog = bpf_object__find_program_by_name(obj, kprobe_name);80 if (CHECK(!kprobe_prog, "find_probe",81 "prog '%s' not found\n", kprobe_name))82 goto cleanup;83 kretprobe_prog = bpf_object__find_program_by_name(obj, kretprobe_name);84 if (CHECK(!kretprobe_prog, "find_probe",85 "prog '%s' not found\n", kretprobe_name))86 goto cleanup;87 raw_tp_prog = bpf_object__find_program_by_name(obj, raw_tp_name);88 if (CHECK(!raw_tp_prog, "find_probe",89 "prog '%s' not found\n", raw_tp_name))90 goto cleanup;91 fentry_prog = bpf_object__find_program_by_name(obj, fentry_name);92 if (CHECK(!fentry_prog, "find_probe",93 "prog '%s' not found\n", fentry_name))94 goto cleanup;95 fexit_prog = bpf_object__find_program_by_name(obj, fexit_name);96 if (CHECK(!fexit_prog, "find_probe",97 "prog '%s' not found\n", fexit_name))98 goto cleanup;99 err = bpf_object__load(obj);100 if (CHECK(err, "obj_load", "err %d\n", err))101 goto cleanup;102 103 setaffinity();104 105 /* base line run */106 test_run("base");107 108 /* attach kprobe */109 link = bpf_program__attach_kprobe(kprobe_prog, false /* retprobe */,110 kprobe_func);111 if (!ASSERT_OK_PTR(link, "attach_kprobe"))112 goto cleanup;113 test_run("kprobe");114 bpf_link__destroy(link);115 116 /* attach kretprobe */117 link = bpf_program__attach_kprobe(kretprobe_prog, true /* retprobe */,118 kprobe_func);119 if (!ASSERT_OK_PTR(link, "attach_kretprobe"))120 goto cleanup;121 test_run("kretprobe");122 bpf_link__destroy(link);123 124 /* attach raw_tp */125 link = bpf_program__attach_raw_tracepoint(raw_tp_prog, "task_rename");126 if (!ASSERT_OK_PTR(link, "attach_raw_tp"))127 goto cleanup;128 test_run("raw_tp");129 bpf_link__destroy(link);130 131 /* attach fentry */132 link = bpf_program__attach_trace(fentry_prog);133 if (!ASSERT_OK_PTR(link, "attach_fentry"))134 goto cleanup;135 test_run("fentry");136 bpf_link__destroy(link);137 138 /* attach fexit */139 link = bpf_program__attach_trace(fexit_prog);140 if (!ASSERT_OK_PTR(link, "attach_fexit"))141 goto cleanup;142 test_run("fexit");143 bpf_link__destroy(link);144 145cleanup:146 prctl(PR_SET_NAME, comm, 0L, 0L, 0L);147 bpf_object__close(obj);148}149