Commit | Line | Data |
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25763b3c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e3edfdec | 2 | /* Copyright (c) 2016 Facebook |
e3edfdec AS |
3 | */ |
4 | #define _GNU_SOURCE | |
5 | #include <sched.h> | |
02a2f000 | 6 | #include <errno.h> |
e3edfdec AS |
7 | #include <stdio.h> |
8 | #include <sys/types.h> | |
9 | #include <asm/unistd.h> | |
10 | #include <fcntl.h> | |
11 | #include <unistd.h> | |
12 | #include <assert.h> | |
13 | #include <sys/wait.h> | |
14 | #include <stdlib.h> | |
15 | #include <signal.h> | |
16 | #include <linux/bpf.h> | |
17 | #include <string.h> | |
18 | #include <time.h> | |
19 | #include <sys/resource.h> | |
2bf3e2ef | 20 | #include <bpf/bpf.h> |
e3edfdec AS |
21 | #include "bpf_load.h" |
22 | ||
23 | #define MAX_CNT 1000000 | |
24 | ||
25 | static __u64 time_get_ns(void) | |
26 | { | |
27 | struct timespec ts; | |
28 | ||
29 | clock_gettime(CLOCK_MONOTONIC, &ts); | |
30 | return ts.tv_sec * 1000000000ull + ts.tv_nsec; | |
31 | } | |
32 | ||
33 | static void test_task_rename(int cpu) | |
34 | { | |
35 | __u64 start_time; | |
36 | char buf[] = "test\n"; | |
37 | int i, fd; | |
38 | ||
39 | fd = open("/proc/self/comm", O_WRONLY|O_TRUNC); | |
40 | if (fd < 0) { | |
41 | printf("couldn't open /proc\n"); | |
42 | exit(1); | |
43 | } | |
44 | start_time = time_get_ns(); | |
02a2f000 TS |
45 | for (i = 0; i < MAX_CNT; i++) { |
46 | if (write(fd, buf, sizeof(buf)) < 0) { | |
47 | printf("task rename failed: %s\n", strerror(errno)); | |
48 | close(fd); | |
49 | return; | |
50 | } | |
51 | } | |
e3edfdec AS |
52 | printf("task_rename:%d: %lld events per sec\n", |
53 | cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); | |
54 | close(fd); | |
55 | } | |
56 | ||
57 | static void test_urandom_read(int cpu) | |
58 | { | |
59 | __u64 start_time; | |
60 | char buf[4]; | |
61 | int i, fd; | |
62 | ||
63 | fd = open("/dev/urandom", O_RDONLY); | |
64 | if (fd < 0) { | |
65 | printf("couldn't open /dev/urandom\n"); | |
66 | exit(1); | |
67 | } | |
68 | start_time = time_get_ns(); | |
02a2f000 TS |
69 | for (i = 0; i < MAX_CNT; i++) { |
70 | if (read(fd, buf, sizeof(buf)) < 0) { | |
71 | printf("failed to read from /dev/urandom: %s\n", strerror(errno)); | |
72 | close(fd); | |
73 | return; | |
74 | } | |
75 | } | |
e3edfdec AS |
76 | printf("urandom_read:%d: %lld events per sec\n", |
77 | cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); | |
78 | close(fd); | |
79 | } | |
80 | ||
81 | static void loop(int cpu, int flags) | |
82 | { | |
83 | cpu_set_t cpuset; | |
84 | ||
85 | CPU_ZERO(&cpuset); | |
86 | CPU_SET(cpu, &cpuset); | |
87 | sched_setaffinity(0, sizeof(cpuset), &cpuset); | |
88 | ||
89 | if (flags & 1) | |
90 | test_task_rename(cpu); | |
91 | if (flags & 2) | |
92 | test_urandom_read(cpu); | |
93 | } | |
94 | ||
95 | static void run_perf_test(int tasks, int flags) | |
96 | { | |
97 | pid_t pid[tasks]; | |
98 | int i; | |
99 | ||
100 | for (i = 0; i < tasks; i++) { | |
101 | pid[i] = fork(); | |
102 | if (pid[i] == 0) { | |
103 | loop(i, flags); | |
104 | exit(0); | |
105 | } else if (pid[i] == -1) { | |
106 | printf("couldn't spawn #%d process\n", i); | |
107 | exit(1); | |
108 | } | |
109 | } | |
110 | for (i = 0; i < tasks; i++) { | |
111 | int status; | |
112 | ||
113 | assert(waitpid(pid[i], &status, 0) == pid[i]); | |
114 | assert(status == 0); | |
115 | } | |
116 | } | |
117 | ||
118 | static void unload_progs(void) | |
119 | { | |
120 | close(prog_fd[0]); | |
121 | close(prog_fd[1]); | |
122 | close(event_fd[0]); | |
123 | close(event_fd[1]); | |
124 | } | |
125 | ||
126 | int main(int argc, char **argv) | |
127 | { | |
128 | struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; | |
129 | char filename[256]; | |
130 | int num_cpu = 8; | |
131 | int test_flags = ~0; | |
132 | ||
133 | setrlimit(RLIMIT_MEMLOCK, &r); | |
134 | ||
135 | if (argc > 1) | |
136 | test_flags = atoi(argv[1]) ? : test_flags; | |
137 | if (argc > 2) | |
138 | num_cpu = atoi(argv[2]) ? : num_cpu; | |
139 | ||
140 | if (test_flags & 0x3) { | |
141 | printf("BASE\n"); | |
142 | run_perf_test(num_cpu, test_flags); | |
143 | } | |
144 | ||
145 | if (test_flags & 0xC) { | |
146 | snprintf(filename, sizeof(filename), | |
147 | "%s_kprobe_kern.o", argv[0]); | |
148 | if (load_bpf_file(filename)) { | |
149 | printf("%s", bpf_log_buf); | |
150 | return 1; | |
151 | } | |
152 | printf("w/KPROBE\n"); | |
153 | run_perf_test(num_cpu, test_flags >> 2); | |
154 | unload_progs(); | |
155 | } | |
156 | ||
157 | if (test_flags & 0x30) { | |
158 | snprintf(filename, sizeof(filename), | |
159 | "%s_tp_kern.o", argv[0]); | |
160 | if (load_bpf_file(filename)) { | |
161 | printf("%s", bpf_log_buf); | |
162 | return 1; | |
163 | } | |
164 | printf("w/TRACEPOINT\n"); | |
165 | run_perf_test(num_cpu, test_flags >> 4); | |
166 | unload_progs(); | |
167 | } | |
168 | ||
4662a4e5 AS |
169 | if (test_flags & 0xC0) { |
170 | snprintf(filename, sizeof(filename), | |
171 | "%s_raw_tp_kern.o", argv[0]); | |
172 | if (load_bpf_file(filename)) { | |
173 | printf("%s", bpf_log_buf); | |
174 | return 1; | |
175 | } | |
176 | printf("w/RAW_TRACEPOINT\n"); | |
177 | run_perf_test(num_cpu, test_flags >> 6); | |
178 | unload_progs(); | |
179 | } | |
180 | ||
e3edfdec AS |
181 | return 0; |
182 | } |