1
2
3
4#define _GNU_SOURCE
5#include <sched.h>
6#include <errno.h>
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>
20#include <bpf/bpf.h>
21#include "bpf_load.h"
22
23#define MAX_CNT 1000000
24
25static __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
33static 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();
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 }
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
57static 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();
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 }
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
81static 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
95static 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
118static 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
126int 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
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
181 return 0;
182}
183
