Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2016 Facebook
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 <bpf/bpf.h>
20#include <bpf/libbpf.h>
21
22#define MAX_CNT 1000000
23
24static struct bpf_link *links[2];
25static struct bpf_object *obj;
26static int cnt;
27
28static __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
36static 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();
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 }
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
60static 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();
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 }
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
84static 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
98static 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
121static int load_progs(char *filename)
122{
123 struct bpf_program *prog;
124 int err = 0;
125
126 obj = bpf_object__open_file(filename, NULL);
127 err = libbpf_get_error(obj);
128 if (err < 0) {
129 fprintf(stderr, "ERROR: opening BPF object file failed\n");
130 return err;
131 }
132
133 /* load BPF program */
134 err = bpf_object__load(obj);
135 if (err < 0) {
136 fprintf(stderr, "ERROR: loading BPF object file failed\n");
137 return err;
138 }
139
140 bpf_object__for_each_program(prog, obj) {
141 links[cnt] = bpf_program__attach(prog);
142 err = libbpf_get_error(links[cnt]);
143 if (err < 0) {
144 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
145 links[cnt] = NULL;
146 return err;
147 }
148 cnt++;
149 }
150
151 return err;
152}
153
154static void unload_progs(void)
155{
156 while (cnt)
157 bpf_link__destroy(links[--cnt]);
158
159 bpf_object__close(obj);
160}
161
162int main(int argc, char **argv)
163{
164 int num_cpu = sysconf(_SC_NPROCESSORS_ONLN);
165 int test_flags = ~0;
166 char filename[256];
167 int err = 0;
168
169
170 if (argc > 1)
171 test_flags = atoi(argv[1]) ? : test_flags;
172 if (argc > 2)
173 num_cpu = atoi(argv[2]) ? : num_cpu;
174
175 if (test_flags & 0x3) {
176 printf("BASE\n");
177 run_perf_test(num_cpu, test_flags);
178 }
179
180 if (test_flags & 0xC) {
181 snprintf(filename, sizeof(filename),
182 "%s_kprobe_kern.o", argv[0]);
183
184 printf("w/KPROBE\n");
185 err = load_progs(filename);
186 if (!err)
187 run_perf_test(num_cpu, test_flags >> 2);
188
189 unload_progs();
190 }
191
192 if (test_flags & 0x30) {
193 snprintf(filename, sizeof(filename),
194 "%s_tp_kern.o", argv[0]);
195 printf("w/TRACEPOINT\n");
196 err = load_progs(filename);
197 if (!err)
198 run_perf_test(num_cpu, test_flags >> 4);
199
200 unload_progs();
201 }
202
203 if (test_flags & 0xC0) {
204 snprintf(filename, sizeof(filename),
205 "%s_raw_tp_kern.o", argv[0]);
206 printf("w/RAW_TRACEPOINT\n");
207 err = load_progs(filename);
208 if (!err)
209 run_perf_test(num_cpu, test_flags >> 6);
210
211 unload_progs();
212 }
213
214 return err;
215}
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
27static __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
35static 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
54static 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
73static 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
87static 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
110static 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
118int 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
161 return 0;
162}