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e3edfdec AS |
1 | /* Copyright (c) 2016 Facebook |
2 | * | |
3 | * This program is free software; you can redistribute it and/or | |
4 | * modify it under the terms of version 2 of the GNU General Public | |
5 | * License as published by the Free Software Foundation. | |
6 | */ | |
7 | #define _GNU_SOURCE | |
8 | #include <sched.h> | |
02a2f000 | 9 | #include <errno.h> |
e3edfdec AS |
10 | #include <stdio.h> |
11 | #include <sys/types.h> | |
12 | #include <asm/unistd.h> | |
13 | #include <fcntl.h> | |
14 | #include <unistd.h> | |
15 | #include <assert.h> | |
16 | #include <sys/wait.h> | |
17 | #include <stdlib.h> | |
18 | #include <signal.h> | |
19 | #include <linux/bpf.h> | |
20 | #include <string.h> | |
21 | #include <time.h> | |
22 | #include <sys/resource.h> | |
2bf3e2ef | 23 | #include <bpf/bpf.h> |
e3edfdec AS |
24 | #include "bpf_load.h" |
25 | ||
26 | #define MAX_CNT 1000000 | |
27 | ||
28 | static __u64 time_get_ns(void) | |
29 | { | |
30 | struct timespec ts; | |
31 | ||
32 | clock_gettime(CLOCK_MONOTONIC, &ts); | |
33 | return ts.tv_sec * 1000000000ull + ts.tv_nsec; | |
34 | } | |
35 | ||
36 | static void test_task_rename(int cpu) | |
37 | { | |
38 | __u64 start_time; | |
39 | char buf[] = "test\n"; | |
40 | int i, fd; | |
41 | ||
42 | fd = open("/proc/self/comm", O_WRONLY|O_TRUNC); | |
43 | if (fd < 0) { | |
44 | printf("couldn't open /proc\n"); | |
45 | exit(1); | |
46 | } | |
47 | start_time = time_get_ns(); | |
02a2f000 TS |
48 | for (i = 0; i < MAX_CNT; i++) { |
49 | if (write(fd, buf, sizeof(buf)) < 0) { | |
50 | printf("task rename failed: %s\n", strerror(errno)); | |
51 | close(fd); | |
52 | return; | |
53 | } | |
54 | } | |
e3edfdec AS |
55 | printf("task_rename:%d: %lld events per sec\n", |
56 | cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); | |
57 | close(fd); | |
58 | } | |
59 | ||
60 | static void test_urandom_read(int cpu) | |
61 | { | |
62 | __u64 start_time; | |
63 | char buf[4]; | |
64 | int i, fd; | |
65 | ||
66 | fd = open("/dev/urandom", O_RDONLY); | |
67 | if (fd < 0) { | |
68 | printf("couldn't open /dev/urandom\n"); | |
69 | exit(1); | |
70 | } | |
71 | start_time = time_get_ns(); | |
02a2f000 TS |
72 | for (i = 0; i < MAX_CNT; i++) { |
73 | if (read(fd, buf, sizeof(buf)) < 0) { | |
74 | printf("failed to read from /dev/urandom: %s\n", strerror(errno)); | |
75 | close(fd); | |
76 | return; | |
77 | } | |
78 | } | |
e3edfdec AS |
79 | printf("urandom_read:%d: %lld events per sec\n", |
80 | cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time)); | |
81 | close(fd); | |
82 | } | |
83 | ||
84 | static void loop(int cpu, int flags) | |
85 | { | |
86 | cpu_set_t cpuset; | |
87 | ||
88 | CPU_ZERO(&cpuset); | |
89 | CPU_SET(cpu, &cpuset); | |
90 | sched_setaffinity(0, sizeof(cpuset), &cpuset); | |
91 | ||
92 | if (flags & 1) | |
93 | test_task_rename(cpu); | |
94 | if (flags & 2) | |
95 | test_urandom_read(cpu); | |
96 | } | |
97 | ||
98 | static void run_perf_test(int tasks, int flags) | |
99 | { | |
100 | pid_t pid[tasks]; | |
101 | int i; | |
102 | ||
103 | for (i = 0; i < tasks; i++) { | |
104 | pid[i] = fork(); | |
105 | if (pid[i] == 0) { | |
106 | loop(i, flags); | |
107 | exit(0); | |
108 | } else if (pid[i] == -1) { | |
109 | printf("couldn't spawn #%d process\n", i); | |
110 | exit(1); | |
111 | } | |
112 | } | |
113 | for (i = 0; i < tasks; i++) { | |
114 | int status; | |
115 | ||
116 | assert(waitpid(pid[i], &status, 0) == pid[i]); | |
117 | assert(status == 0); | |
118 | } | |
119 | } | |
120 | ||
121 | static void unload_progs(void) | |
122 | { | |
123 | close(prog_fd[0]); | |
124 | close(prog_fd[1]); | |
125 | close(event_fd[0]); | |
126 | close(event_fd[1]); | |
127 | } | |
128 | ||
129 | int main(int argc, char **argv) | |
130 | { | |
131 | struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; | |
132 | char filename[256]; | |
133 | int num_cpu = 8; | |
134 | int test_flags = ~0; | |
135 | ||
136 | setrlimit(RLIMIT_MEMLOCK, &r); | |
137 | ||
138 | if (argc > 1) | |
139 | test_flags = atoi(argv[1]) ? : test_flags; | |
140 | if (argc > 2) | |
141 | num_cpu = atoi(argv[2]) ? : num_cpu; | |
142 | ||
143 | if (test_flags & 0x3) { | |
144 | printf("BASE\n"); | |
145 | run_perf_test(num_cpu, test_flags); | |
146 | } | |
147 | ||
148 | if (test_flags & 0xC) { | |
149 | snprintf(filename, sizeof(filename), | |
150 | "%s_kprobe_kern.o", argv[0]); | |
151 | if (load_bpf_file(filename)) { | |
152 | printf("%s", bpf_log_buf); | |
153 | return 1; | |
154 | } | |
155 | printf("w/KPROBE\n"); | |
156 | run_perf_test(num_cpu, test_flags >> 2); | |
157 | unload_progs(); | |
158 | } | |
159 | ||
160 | if (test_flags & 0x30) { | |
161 | snprintf(filename, sizeof(filename), | |
162 | "%s_tp_kern.o", argv[0]); | |
163 | if (load_bpf_file(filename)) { | |
164 | printf("%s", bpf_log_buf); | |
165 | return 1; | |
166 | } | |
167 | printf("w/TRACEPOINT\n"); | |
168 | run_perf_test(num_cpu, test_flags >> 4); | |
169 | unload_progs(); | |
170 | } | |
171 | ||
4662a4e5 AS |
172 | if (test_flags & 0xC0) { |
173 | snprintf(filename, sizeof(filename), | |
174 | "%s_raw_tp_kern.o", argv[0]); | |
175 | if (load_bpf_file(filename)) { | |
176 | printf("%s", bpf_log_buf); | |
177 | return 1; | |
178 | } | |
179 | printf("w/RAW_TRACEPOINT\n"); | |
180 | run_perf_test(num_cpu, test_flags >> 6); | |
181 | unload_progs(); | |
182 | } | |
183 | ||
e3edfdec AS |
184 | return 0; |
185 | } |