1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2019 Facebook */
6 #include <test_progs.h>
10 static __u64 time_get_ns(void)
14 clock_gettime(CLOCK_MONOTONIC, &ts);
15 return ts.tv_sec * 1000000000ull + ts.tv_nsec;
18 static int test_task_rename(const char *prog)
20 int i, fd, duration = 0, err;
21 char buf[] = "test_overhead";
24 fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
25 if (CHECK(fd < 0, "open /proc", "err %d", errno))
27 start_time = time_get_ns();
28 for (i = 0; i < MAX_CNT; i++) {
29 err = write(fd, buf, sizeof(buf));
31 CHECK(err < 0, "task rename", "err %d", errno);
36 printf("task_rename %s\t%lluK events per sec\n", prog,
37 MAX_CNT * 1000000ll / (time_get_ns() - start_time));
42 static void test_run(const char *prog)
44 test_task_rename(prog);
47 static void setaffinity(void)
53 CPU_SET(cpu, &cpuset);
54 sched_setaffinity(0, sizeof(cpuset), &cpuset);
57 void test_test_overhead(void)
59 const char *kprobe_name = "kprobe/__set_task_comm";
60 const char *kretprobe_name = "kretprobe/__set_task_comm";
61 const char *raw_tp_name = "raw_tp/task_rename";
62 const char *fentry_name = "fentry/__set_task_comm";
63 const char *fexit_name = "fexit/__set_task_comm";
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;
72 if (CHECK_FAIL(prctl(PR_GET_NAME, comm, 0L, 0L, 0L)))
75 obj = bpf_object__open_file("./test_overhead.o", NULL);
76 if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj)))
79 kprobe_prog = bpf_object__find_program_by_title(obj, kprobe_name);
80 if (CHECK(!kprobe_prog, "find_probe",
81 "prog '%s' not found\n", kprobe_name))
83 kretprobe_prog = bpf_object__find_program_by_title(obj, kretprobe_name);
84 if (CHECK(!kretprobe_prog, "find_probe",
85 "prog '%s' not found\n", kretprobe_name))
87 raw_tp_prog = bpf_object__find_program_by_title(obj, raw_tp_name);
88 if (CHECK(!raw_tp_prog, "find_probe",
89 "prog '%s' not found\n", raw_tp_name))
91 fentry_prog = bpf_object__find_program_by_title(obj, fentry_name);
92 if (CHECK(!fentry_prog, "find_probe",
93 "prog '%s' not found\n", fentry_name))
95 fexit_prog = bpf_object__find_program_by_title(obj, fexit_name);
96 if (CHECK(!fexit_prog, "find_probe",
97 "prog '%s' not found\n", fexit_name))
99 err = bpf_object__load(obj);
100 if (CHECK(err, "obj_load", "err %d\n", err))
109 link = bpf_program__attach_kprobe(kprobe_prog, false /* retprobe */,
111 if (CHECK(IS_ERR(link), "attach_kprobe", "err %ld\n", PTR_ERR(link)))
114 bpf_link__destroy(link);
116 /* attach kretprobe */
117 link = bpf_program__attach_kprobe(kretprobe_prog, true /* retprobe */,
119 if (CHECK(IS_ERR(link), "attach kretprobe", "err %ld\n", PTR_ERR(link)))
121 test_run("kretprobe");
122 bpf_link__destroy(link);
125 link = bpf_program__attach_raw_tracepoint(raw_tp_prog, "task_rename");
126 if (CHECK(IS_ERR(link), "attach fentry", "err %ld\n", PTR_ERR(link)))
129 bpf_link__destroy(link);
132 link = bpf_program__attach_trace(fentry_prog);
133 if (CHECK(IS_ERR(link), "attach fentry", "err %ld\n", PTR_ERR(link)))
136 bpf_link__destroy(link);
139 link = bpf_program__attach_trace(fexit_prog);
140 if (CHECK(IS_ERR(link), "attach fexit", "err %ld\n", PTR_ERR(link)))
143 bpf_link__destroy(link);
146 prctl(PR_SET_NAME, comm, 0L, 0L, 0L);
147 bpf_object__close(obj);