1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2016 Facebook
*/
#define _GNU_SOURCE
#include <sched.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <asm/unistd.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <signal.h>
#include <linux/bpf.h>
#include <string.h>
#include <time.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
#define MAX_CNT 1000000
#define DUMMY_IP "127.0.0.1"
#define DUMMY_PORT 80
static struct bpf_link *links[2];
static struct bpf_object *obj;
static int cnt;
static __u64 time_get_ns(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec * 1000000000ull + ts.tv_nsec;
}
static void test_task_rename(int cpu)
{
char buf[] = "test\n";
__u64 start_time;
int i, fd;
fd = open("/proc/self/comm", O_WRONLY|O_TRUNC);
if (fd < 0) {
printf("couldn't open /proc\n");
exit(1);
}
start_time = time_get_ns();
for (i = 0; i < MAX_CNT; i++) {
if (write(fd, buf, sizeof(buf)) < 0) {
printf("task rename failed: %s\n", strerror(errno));
close(fd);
return;
}
}
printf("task_rename:%d: %lld events per sec\n",
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
close(fd);
}
static void test_fib_table_lookup(int cpu)
{
struct sockaddr_in addr;
char buf[] = "test\n";
__u64 start_time;
int i, fd;
fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (fd < 0) {
printf("couldn't open socket\n");
exit(1);
}
memset((char *)&addr, 0, sizeof(addr));
addr.sin_addr.s_addr = inet_addr(DUMMY_IP);
addr.sin_port = htons(DUMMY_PORT);
addr.sin_family = AF_INET;
start_time = time_get_ns();
for (i = 0; i < MAX_CNT; i++) {
if (sendto(fd, buf, strlen(buf), 0,
(struct sockaddr *)&addr, sizeof(addr)) < 0) {
printf("failed to start ping: %s\n", strerror(errno));
close(fd);
return;
}
}
printf("fib_table_lookup:%d: %lld events per sec\n",
cpu, MAX_CNT * 1000000000ll / (time_get_ns() - start_time));
close(fd);
}
static void loop(int cpu, int flags)
{
cpu_set_t cpuset;
CPU_ZERO(&cpuset);
CPU_SET(cpu, &cpuset);
sched_setaffinity(0, sizeof(cpuset), &cpuset);
if (flags & 1)
test_task_rename(cpu);
if (flags & 2)
test_fib_table_lookup(cpu);
}
static void run_perf_test(int tasks, int flags)
{
pid_t pid[tasks];
int i;
for (i = 0; i < tasks; i++) {
pid[i] = fork();
if (pid[i] == 0) {
loop(i, flags);
exit(0);
} else if (pid[i] == -1) {
printf("couldn't spawn #%d process\n", i);
exit(1);
}
}
for (i = 0; i < tasks; i++) {
int status;
assert(waitpid(pid[i], &status, 0) == pid[i]);
assert(status == 0);
}
}
static int load_progs(char *filename)
{
struct bpf_program *prog;
int err = 0;
obj = bpf_object__open_file(filename, NULL);
err = libbpf_get_error(obj);
if (err < 0) {
fprintf(stderr, "ERROR: opening BPF object file failed\n");
return err;
}
/* load BPF program */
err = bpf_object__load(obj);
if (err < 0) {
fprintf(stderr, "ERROR: loading BPF object file failed\n");
return err;
}
bpf_object__for_each_program(prog, obj) {
links[cnt] = bpf_program__attach(prog);
err = libbpf_get_error(links[cnt]);
if (err < 0) {
fprintf(stderr, "ERROR: bpf_program__attach failed\n");
links[cnt] = NULL;
return err;
}
cnt++;
}
return err;
}
static void unload_progs(void)
{
while (cnt)
bpf_link__destroy(links[--cnt]);
bpf_object__close(obj);
}
int main(int argc, char **argv)
{
int num_cpu = sysconf(_SC_NPROCESSORS_ONLN);
int test_flags = ~0;
char filename[256];
int err = 0;
if (argc > 1)
test_flags = atoi(argv[1]) ? : test_flags;
if (argc > 2)
num_cpu = atoi(argv[2]) ? : num_cpu;
if (test_flags & 0x3) {
printf("BASE\n");
run_perf_test(num_cpu, test_flags);
}
if (test_flags & 0xC) {
snprintf(filename, sizeof(filename),
"%s_kprobe_kern.o", argv[0]);
printf("w/KPROBE\n");
err = load_progs(filename);
if (!err)
run_perf_test(num_cpu, test_flags >> 2);
unload_progs();
}
if (test_flags & 0x30) {
snprintf(filename, sizeof(filename),
"%s_tp_kern.o", argv[0]);
printf("w/TRACEPOINT\n");
err = load_progs(filename);
if (!err)
run_perf_test(num_cpu, test_flags >> 4);
unload_progs();
}
if (test_flags & 0xC0) {
snprintf(filename, sizeof(filename),
"%s_raw_tp_kern.o", argv[0]);
printf("w/RAW_TRACEPOINT\n");
err = load_progs(filename);
if (!err)
run_perf_test(num_cpu, test_flags >> 6);
unload_progs();
}
return err;
}
|
