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