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1c47910e 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 | #include <stdio.h> | |
8 | #include <unistd.h> | |
9 | #include <stdlib.h> | |
10 | #include <stdbool.h> | |
11 | #include <string.h> | |
12 | #include <fcntl.h> | |
13 | #include <poll.h> | |
14 | #include <sys/ioctl.h> | |
15 | #include <linux/perf_event.h> | |
16 | #include <linux/bpf.h> | |
17 | #include <signal.h> | |
18 | #include <assert.h> | |
19 | #include <errno.h> | |
20 | #include <sys/resource.h> | |
21 | #include "libbpf.h" | |
22 | #include "bpf_load.h" | |
205c8ada | 23 | #include "perf-sys.h" |
28dbf861 | 24 | #include "trace_helpers.h" |
1c47910e AS |
25 | |
26 | #define SAMPLE_FREQ 50 | |
27 | ||
28 | static bool sys_read_seen, sys_write_seen; | |
29 | ||
30 | static void print_ksym(__u64 addr) | |
31 | { | |
32 | struct ksym *sym; | |
33 | ||
34 | if (!addr) | |
35 | return; | |
36 | sym = ksym_search(addr); | |
37 | printf("%s;", sym->name); | |
38 | if (!strcmp(sym->name, "sys_read")) | |
39 | sys_read_seen = true; | |
40 | else if (!strcmp(sym->name, "sys_write")) | |
41 | sys_write_seen = true; | |
42 | } | |
43 | ||
44 | static void print_addr(__u64 addr) | |
45 | { | |
46 | if (!addr) | |
47 | return; | |
48 | printf("%llx;", addr); | |
49 | } | |
50 | ||
51 | #define TASK_COMM_LEN 16 | |
52 | ||
53 | struct key_t { | |
54 | char comm[TASK_COMM_LEN]; | |
55 | __u32 kernstack; | |
56 | __u32 userstack; | |
57 | }; | |
58 | ||
59 | static void print_stack(struct key_t *key, __u64 count) | |
60 | { | |
61 | __u64 ip[PERF_MAX_STACK_DEPTH] = {}; | |
62 | static bool warned; | |
63 | int i; | |
64 | ||
65 | printf("%3lld %s;", count, key->comm); | |
d40fc181 | 66 | if (bpf_map_lookup_elem(map_fd[1], &key->kernstack, ip) != 0) { |
1c47910e AS |
67 | printf("---;"); |
68 | } else { | |
69 | for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--) | |
70 | print_ksym(ip[i]); | |
71 | } | |
72 | printf("-;"); | |
d40fc181 | 73 | if (bpf_map_lookup_elem(map_fd[1], &key->userstack, ip) != 0) { |
1c47910e AS |
74 | printf("---;"); |
75 | } else { | |
76 | for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--) | |
77 | print_addr(ip[i]); | |
78 | } | |
41e9a804 TQ |
79 | if (count < 6) |
80 | printf("\r"); | |
81 | else | |
82 | printf("\n"); | |
1c47910e AS |
83 | |
84 | if (key->kernstack == -EEXIST && !warned) { | |
85 | printf("stackmap collisions seen. Consider increasing size\n"); | |
86 | warned = true; | |
87 | } else if ((int)key->kernstack < 0 && (int)key->userstack < 0) { | |
88 | printf("err stackid %d %d\n", key->kernstack, key->userstack); | |
89 | } | |
90 | } | |
91 | ||
92 | static void int_exit(int sig) | |
93 | { | |
94 | kill(0, SIGKILL); | |
95 | exit(0); | |
96 | } | |
97 | ||
98 | static void print_stacks(void) | |
99 | { | |
100 | struct key_t key = {}, next_key; | |
101 | __u64 value; | |
102 | __u32 stackid = 0, next_id; | |
103 | int fd = map_fd[0], stack_map = map_fd[1]; | |
104 | ||
105 | sys_read_seen = sys_write_seen = false; | |
d40fc181 JS |
106 | while (bpf_map_get_next_key(fd, &key, &next_key) == 0) { |
107 | bpf_map_lookup_elem(fd, &next_key, &value); | |
1c47910e | 108 | print_stack(&next_key, value); |
d40fc181 | 109 | bpf_map_delete_elem(fd, &next_key); |
1c47910e AS |
110 | key = next_key; |
111 | } | |
41e9a804 | 112 | printf("\n"); |
1c47910e AS |
113 | if (!sys_read_seen || !sys_write_seen) { |
114 | printf("BUG kernel stack doesn't contain sys_read() and sys_write()\n"); | |
115 | int_exit(0); | |
116 | } | |
117 | ||
118 | /* clear stack map */ | |
d40fc181 JS |
119 | while (bpf_map_get_next_key(stack_map, &stackid, &next_id) == 0) { |
120 | bpf_map_delete_elem(stack_map, &next_id); | |
1c47910e AS |
121 | stackid = next_id; |
122 | } | |
123 | } | |
124 | ||
125 | static void test_perf_event_all_cpu(struct perf_event_attr *attr) | |
126 | { | |
127 | int nr_cpus = sysconf(_SC_NPROCESSORS_CONF); | |
128 | int *pmu_fd = malloc(nr_cpus * sizeof(int)); | |
41e9a804 | 129 | int i, error = 0; |
1c47910e | 130 | |
81b9cf80 YS |
131 | /* system wide perf event, no need to inherit */ |
132 | attr->inherit = 0; | |
133 | ||
1c47910e AS |
134 | /* open perf_event on all cpus */ |
135 | for (i = 0; i < nr_cpus; i++) { | |
205c8ada | 136 | pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0); |
1c47910e | 137 | if (pmu_fd[i] < 0) { |
205c8ada | 138 | printf("sys_perf_event_open failed\n"); |
41e9a804 | 139 | error = 1; |
1c47910e AS |
140 | goto all_cpu_err; |
141 | } | |
142 | assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0); | |
41e9a804 | 143 | assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0); |
1c47910e | 144 | } |
41e9a804 | 145 | system("dd if=/dev/zero of=/dev/null count=5000k status=none"); |
1c47910e AS |
146 | print_stacks(); |
147 | all_cpu_err: | |
41e9a804 TQ |
148 | for (i--; i >= 0; i--) { |
149 | ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE); | |
1c47910e | 150 | close(pmu_fd[i]); |
41e9a804 | 151 | } |
1c47910e | 152 | free(pmu_fd); |
41e9a804 TQ |
153 | if (error) |
154 | int_exit(0); | |
1c47910e AS |
155 | } |
156 | ||
157 | static void test_perf_event_task(struct perf_event_attr *attr) | |
158 | { | |
159 | int pmu_fd; | |
160 | ||
81b9cf80 YS |
161 | /* per task perf event, enable inherit so the "dd ..." command can be traced properly. |
162 | * Enabling inherit will cause bpf_perf_prog_read_time helper failure. | |
163 | */ | |
164 | attr->inherit = 1; | |
165 | ||
1c47910e | 166 | /* open task bound event */ |
205c8ada | 167 | pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0); |
1c47910e | 168 | if (pmu_fd < 0) { |
205c8ada | 169 | printf("sys_perf_event_open failed\n"); |
41e9a804 | 170 | int_exit(0); |
1c47910e AS |
171 | } |
172 | assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0); | |
41e9a804 TQ |
173 | assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0); |
174 | system("dd if=/dev/zero of=/dev/null count=5000k status=none"); | |
1c47910e | 175 | print_stacks(); |
41e9a804 | 176 | ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE); |
1c47910e AS |
177 | close(pmu_fd); |
178 | } | |
179 | ||
180 | static void test_bpf_perf_event(void) | |
181 | { | |
182 | struct perf_event_attr attr_type_hw = { | |
183 | .sample_freq = SAMPLE_FREQ, | |
184 | .freq = 1, | |
185 | .type = PERF_TYPE_HARDWARE, | |
186 | .config = PERF_COUNT_HW_CPU_CYCLES, | |
1c47910e AS |
187 | }; |
188 | struct perf_event_attr attr_type_sw = { | |
189 | .sample_freq = SAMPLE_FREQ, | |
190 | .freq = 1, | |
191 | .type = PERF_TYPE_SOFTWARE, | |
192 | .config = PERF_COUNT_SW_CPU_CLOCK, | |
1c47910e | 193 | }; |
41e9a804 TQ |
194 | struct perf_event_attr attr_hw_cache_l1d = { |
195 | .sample_freq = SAMPLE_FREQ, | |
196 | .freq = 1, | |
197 | .type = PERF_TYPE_HW_CACHE, | |
198 | .config = | |
199 | PERF_COUNT_HW_CACHE_L1D | | |
200 | (PERF_COUNT_HW_CACHE_OP_READ << 8) | | |
201 | (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16), | |
41e9a804 TQ |
202 | }; |
203 | struct perf_event_attr attr_hw_cache_branch_miss = { | |
204 | .sample_freq = SAMPLE_FREQ, | |
205 | .freq = 1, | |
206 | .type = PERF_TYPE_HW_CACHE, | |
207 | .config = | |
208 | PERF_COUNT_HW_CACHE_BPU | | |
209 | (PERF_COUNT_HW_CACHE_OP_READ << 8) | | |
210 | (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), | |
41e9a804 TQ |
211 | }; |
212 | struct perf_event_attr attr_type_raw = { | |
213 | .sample_freq = SAMPLE_FREQ, | |
214 | .freq = 1, | |
215 | .type = PERF_TYPE_RAW, | |
216 | /* Intel Instruction Retired */ | |
217 | .config = 0xc0, | |
41e9a804 | 218 | }; |
12fe1225 TQ |
219 | struct perf_event_attr attr_type_raw_lock_load = { |
220 | .sample_freq = SAMPLE_FREQ, | |
221 | .freq = 1, | |
222 | .type = PERF_TYPE_RAW, | |
223 | /* Intel MEM_UOPS_RETIRED.LOCK_LOADS */ | |
224 | .config = 0x21d0, | |
225 | /* Request to record lock address from PEBS */ | |
226 | .sample_type = PERF_SAMPLE_ADDR, | |
227 | /* Record address value requires precise event */ | |
228 | .precise_ip = 2, | |
229 | }; | |
1c47910e | 230 | |
41e9a804 | 231 | printf("Test HW_CPU_CYCLES\n"); |
1c47910e AS |
232 | test_perf_event_all_cpu(&attr_type_hw); |
233 | test_perf_event_task(&attr_type_hw); | |
41e9a804 TQ |
234 | |
235 | printf("Test SW_CPU_CLOCK\n"); | |
1c47910e AS |
236 | test_perf_event_all_cpu(&attr_type_sw); |
237 | test_perf_event_task(&attr_type_sw); | |
41e9a804 TQ |
238 | |
239 | printf("Test HW_CACHE_L1D\n"); | |
240 | test_perf_event_all_cpu(&attr_hw_cache_l1d); | |
241 | test_perf_event_task(&attr_hw_cache_l1d); | |
242 | ||
243 | printf("Test HW_CACHE_BPU\n"); | |
244 | test_perf_event_all_cpu(&attr_hw_cache_branch_miss); | |
245 | test_perf_event_task(&attr_hw_cache_branch_miss); | |
246 | ||
247 | printf("Test Instruction Retired\n"); | |
248 | test_perf_event_all_cpu(&attr_type_raw); | |
249 | test_perf_event_task(&attr_type_raw); | |
250 | ||
12fe1225 TQ |
251 | printf("Test Lock Load\n"); |
252 | test_perf_event_all_cpu(&attr_type_raw_lock_load); | |
253 | test_perf_event_task(&attr_type_raw_lock_load); | |
254 | ||
41e9a804 | 255 | printf("*** PASS ***\n"); |
1c47910e AS |
256 | } |
257 | ||
258 | ||
259 | int main(int argc, char **argv) | |
260 | { | |
261 | struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY}; | |
262 | char filename[256]; | |
263 | ||
264 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); | |
265 | setrlimit(RLIMIT_MEMLOCK, &r); | |
266 | ||
267 | signal(SIGINT, int_exit); | |
ad990dbe | 268 | signal(SIGTERM, int_exit); |
1c47910e AS |
269 | |
270 | if (load_kallsyms()) { | |
271 | printf("failed to process /proc/kallsyms\n"); | |
272 | return 1; | |
273 | } | |
274 | ||
275 | if (load_bpf_file(filename)) { | |
276 | printf("%s", bpf_log_buf); | |
277 | return 2; | |
278 | } | |
279 | ||
280 | if (fork() == 0) { | |
281 | read_trace_pipe(); | |
282 | return 0; | |
283 | } | |
284 | test_bpf_perf_event(); | |
1c47910e AS |
285 | int_exit(0); |
286 | return 0; | |
287 | } |