Commit | Line | Data |
---|---|---|
25763b3c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1c47910e | 2 | /* Copyright (c) 2016 Facebook |
1c47910e AS |
3 | */ |
4 | #include <stdio.h> | |
5 | #include <unistd.h> | |
6 | #include <stdlib.h> | |
7 | #include <stdbool.h> | |
8 | #include <string.h> | |
1c47910e AS |
9 | #include <linux/perf_event.h> |
10 | #include <linux/bpf.h> | |
11 | #include <signal.h> | |
1c47910e AS |
12 | #include <errno.h> |
13 | #include <sys/resource.h> | |
aa5e2af6 | 14 | #include <bpf/bpf.h> |
7cf245a3 | 15 | #include <bpf/libbpf.h> |
205c8ada | 16 | #include "perf-sys.h" |
28dbf861 | 17 | #include "trace_helpers.h" |
1c47910e AS |
18 | |
19 | #define SAMPLE_FREQ 50 | |
20 | ||
aa5e2af6 DL |
21 | static int pid; |
22 | /* counts, stackmap */ | |
23 | static int map_fd[2]; | |
24 | struct bpf_program *prog; | |
1c47910e AS |
25 | static bool sys_read_seen, sys_write_seen; |
26 | ||
27 | static void print_ksym(__u64 addr) | |
28 | { | |
29 | struct ksym *sym; | |
30 | ||
31 | if (!addr) | |
32 | return; | |
33 | sym = ksym_search(addr); | |
e67b2c71 DL |
34 | if (!sym) { |
35 | printf("ksym not found. Is kallsyms loaded?\n"); | |
36 | return; | |
37 | } | |
38 | ||
1c47910e | 39 | printf("%s;", sym->name); |
bba1b2a8 | 40 | if (!strstr(sym->name, "sys_read")) |
1c47910e | 41 | sys_read_seen = true; |
bba1b2a8 | 42 | else if (!strstr(sym->name, "sys_write")) |
1c47910e AS |
43 | sys_write_seen = true; |
44 | } | |
45 | ||
46 | static void print_addr(__u64 addr) | |
47 | { | |
48 | if (!addr) | |
49 | return; | |
50 | printf("%llx;", addr); | |
51 | } | |
52 | ||
53 | #define TASK_COMM_LEN 16 | |
54 | ||
55 | struct key_t { | |
56 | char comm[TASK_COMM_LEN]; | |
57 | __u32 kernstack; | |
58 | __u32 userstack; | |
59 | }; | |
60 | ||
61 | static void print_stack(struct key_t *key, __u64 count) | |
62 | { | |
63 | __u64 ip[PERF_MAX_STACK_DEPTH] = {}; | |
64 | static bool warned; | |
65 | int i; | |
66 | ||
67 | printf("%3lld %s;", count, key->comm); | |
d40fc181 | 68 | if (bpf_map_lookup_elem(map_fd[1], &key->kernstack, ip) != 0) { |
1c47910e AS |
69 | printf("---;"); |
70 | } else { | |
71 | for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--) | |
72 | print_ksym(ip[i]); | |
73 | } | |
74 | printf("-;"); | |
d40fc181 | 75 | if (bpf_map_lookup_elem(map_fd[1], &key->userstack, ip) != 0) { |
1c47910e AS |
76 | printf("---;"); |
77 | } else { | |
78 | for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--) | |
79 | print_addr(ip[i]); | |
80 | } | |
41e9a804 TQ |
81 | if (count < 6) |
82 | printf("\r"); | |
83 | else | |
84 | printf("\n"); | |
1c47910e AS |
85 | |
86 | if (key->kernstack == -EEXIST && !warned) { | |
87 | printf("stackmap collisions seen. Consider increasing size\n"); | |
88 | warned = true; | |
89 | } else if ((int)key->kernstack < 0 && (int)key->userstack < 0) { | |
90 | printf("err stackid %d %d\n", key->kernstack, key->userstack); | |
91 | } | |
92 | } | |
93 | ||
aa5e2af6 | 94 | static void err_exit(int err) |
1c47910e | 95 | { |
aa5e2af6 DL |
96 | kill(pid, SIGKILL); |
97 | exit(err); | |
1c47910e AS |
98 | } |
99 | ||
100 | static void print_stacks(void) | |
101 | { | |
102 | struct key_t key = {}, next_key; | |
103 | __u64 value; | |
104 | __u32 stackid = 0, next_id; | |
aa5e2af6 | 105 | int error = 1, fd = map_fd[0], stack_map = map_fd[1]; |
1c47910e AS |
106 | |
107 | sys_read_seen = sys_write_seen = false; | |
d40fc181 JS |
108 | while (bpf_map_get_next_key(fd, &key, &next_key) == 0) { |
109 | bpf_map_lookup_elem(fd, &next_key, &value); | |
1c47910e | 110 | print_stack(&next_key, value); |
d40fc181 | 111 | bpf_map_delete_elem(fd, &next_key); |
1c47910e AS |
112 | key = next_key; |
113 | } | |
41e9a804 | 114 | printf("\n"); |
1c47910e AS |
115 | if (!sys_read_seen || !sys_write_seen) { |
116 | printf("BUG kernel stack doesn't contain sys_read() and sys_write()\n"); | |
aa5e2af6 | 117 | err_exit(error); |
1c47910e AS |
118 | } |
119 | ||
120 | /* clear stack map */ | |
d40fc181 JS |
121 | while (bpf_map_get_next_key(stack_map, &stackid, &next_id) == 0) { |
122 | bpf_map_delete_elem(stack_map, &next_id); | |
1c47910e AS |
123 | stackid = next_id; |
124 | } | |
125 | } | |
126 | ||
492b7e89 TS |
127 | static inline int generate_load(void) |
128 | { | |
129 | if (system("dd if=/dev/zero of=/dev/null count=5000k status=none") < 0) { | |
130 | printf("failed to generate some load with dd: %s\n", strerror(errno)); | |
131 | return -1; | |
132 | } | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
1c47910e AS |
137 | static void test_perf_event_all_cpu(struct perf_event_attr *attr) |
138 | { | |
aa5e2af6 DL |
139 | int nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); |
140 | struct bpf_link **links = calloc(nr_cpus, sizeof(struct bpf_link *)); | |
141 | int i, pmu_fd, error = 1; | |
142 | ||
143 | if (!links) { | |
144 | printf("malloc of links failed\n"); | |
145 | goto err; | |
146 | } | |
1c47910e | 147 | |
81b9cf80 YS |
148 | /* system wide perf event, no need to inherit */ |
149 | attr->inherit = 0; | |
150 | ||
1c47910e AS |
151 | /* open perf_event on all cpus */ |
152 | for (i = 0; i < nr_cpus; i++) { | |
aa5e2af6 DL |
153 | pmu_fd = sys_perf_event_open(attr, -1, i, -1, 0); |
154 | if (pmu_fd < 0) { | |
205c8ada | 155 | printf("sys_perf_event_open failed\n"); |
1c47910e AS |
156 | goto all_cpu_err; |
157 | } | |
aa5e2af6 | 158 | links[i] = bpf_program__attach_perf_event(prog, pmu_fd); |
0efdcefb | 159 | if (libbpf_get_error(links[i])) { |
aa5e2af6 DL |
160 | printf("bpf_program__attach_perf_event failed\n"); |
161 | links[i] = NULL; | |
162 | close(pmu_fd); | |
163 | goto all_cpu_err; | |
164 | } | |
1c47910e | 165 | } |
492b7e89 | 166 | |
aa5e2af6 | 167 | if (generate_load() < 0) |
492b7e89 | 168 | goto all_cpu_err; |
aa5e2af6 | 169 | |
1c47910e | 170 | print_stacks(); |
aa5e2af6 | 171 | error = 0; |
1c47910e | 172 | all_cpu_err: |
aa5e2af6 DL |
173 | for (i--; i >= 0; i--) |
174 | bpf_link__destroy(links[i]); | |
175 | err: | |
176 | free(links); | |
41e9a804 | 177 | if (error) |
aa5e2af6 | 178 | err_exit(error); |
1c47910e AS |
179 | } |
180 | ||
181 | static void test_perf_event_task(struct perf_event_attr *attr) | |
182 | { | |
aa5e2af6 DL |
183 | struct bpf_link *link = NULL; |
184 | int pmu_fd, error = 1; | |
1c47910e | 185 | |
81b9cf80 YS |
186 | /* per task perf event, enable inherit so the "dd ..." command can be traced properly. |
187 | * Enabling inherit will cause bpf_perf_prog_read_time helper failure. | |
188 | */ | |
189 | attr->inherit = 1; | |
190 | ||
1c47910e | 191 | /* open task bound event */ |
205c8ada | 192 | pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0); |
1c47910e | 193 | if (pmu_fd < 0) { |
205c8ada | 194 | printf("sys_perf_event_open failed\n"); |
aa5e2af6 | 195 | goto err; |
1c47910e | 196 | } |
aa5e2af6 | 197 | link = bpf_program__attach_perf_event(prog, pmu_fd); |
0efdcefb | 198 | if (libbpf_get_error(link)) { |
aa5e2af6 DL |
199 | printf("bpf_program__attach_perf_event failed\n"); |
200 | link = NULL; | |
201 | close(pmu_fd); | |
492b7e89 TS |
202 | goto err; |
203 | } | |
aa5e2af6 DL |
204 | |
205 | if (generate_load() < 0) | |
206 | goto err; | |
207 | ||
1c47910e | 208 | print_stacks(); |
aa5e2af6 | 209 | error = 0; |
492b7e89 | 210 | err: |
aa5e2af6 | 211 | bpf_link__destroy(link); |
492b7e89 | 212 | if (error) |
aa5e2af6 | 213 | err_exit(error); |
1c47910e AS |
214 | } |
215 | ||
216 | static void test_bpf_perf_event(void) | |
217 | { | |
218 | struct perf_event_attr attr_type_hw = { | |
219 | .sample_freq = SAMPLE_FREQ, | |
220 | .freq = 1, | |
221 | .type = PERF_TYPE_HARDWARE, | |
222 | .config = PERF_COUNT_HW_CPU_CYCLES, | |
1c47910e AS |
223 | }; |
224 | struct perf_event_attr attr_type_sw = { | |
225 | .sample_freq = SAMPLE_FREQ, | |
226 | .freq = 1, | |
227 | .type = PERF_TYPE_SOFTWARE, | |
228 | .config = PERF_COUNT_SW_CPU_CLOCK, | |
1c47910e | 229 | }; |
41e9a804 TQ |
230 | struct perf_event_attr attr_hw_cache_l1d = { |
231 | .sample_freq = SAMPLE_FREQ, | |
232 | .freq = 1, | |
233 | .type = PERF_TYPE_HW_CACHE, | |
234 | .config = | |
235 | PERF_COUNT_HW_CACHE_L1D | | |
236 | (PERF_COUNT_HW_CACHE_OP_READ << 8) | | |
237 | (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16), | |
41e9a804 TQ |
238 | }; |
239 | struct perf_event_attr attr_hw_cache_branch_miss = { | |
240 | .sample_freq = SAMPLE_FREQ, | |
241 | .freq = 1, | |
242 | .type = PERF_TYPE_HW_CACHE, | |
243 | .config = | |
244 | PERF_COUNT_HW_CACHE_BPU | | |
245 | (PERF_COUNT_HW_CACHE_OP_READ << 8) | | |
246 | (PERF_COUNT_HW_CACHE_RESULT_MISS << 16), | |
41e9a804 TQ |
247 | }; |
248 | struct perf_event_attr attr_type_raw = { | |
249 | .sample_freq = SAMPLE_FREQ, | |
250 | .freq = 1, | |
251 | .type = PERF_TYPE_RAW, | |
252 | /* Intel Instruction Retired */ | |
253 | .config = 0xc0, | |
41e9a804 | 254 | }; |
12fe1225 TQ |
255 | struct perf_event_attr attr_type_raw_lock_load = { |
256 | .sample_freq = SAMPLE_FREQ, | |
257 | .freq = 1, | |
258 | .type = PERF_TYPE_RAW, | |
259 | /* Intel MEM_UOPS_RETIRED.LOCK_LOADS */ | |
260 | .config = 0x21d0, | |
261 | /* Request to record lock address from PEBS */ | |
262 | .sample_type = PERF_SAMPLE_ADDR, | |
263 | /* Record address value requires precise event */ | |
264 | .precise_ip = 2, | |
265 | }; | |
1c47910e | 266 | |
41e9a804 | 267 | printf("Test HW_CPU_CYCLES\n"); |
1c47910e AS |
268 | test_perf_event_all_cpu(&attr_type_hw); |
269 | test_perf_event_task(&attr_type_hw); | |
41e9a804 TQ |
270 | |
271 | printf("Test SW_CPU_CLOCK\n"); | |
1c47910e AS |
272 | test_perf_event_all_cpu(&attr_type_sw); |
273 | test_perf_event_task(&attr_type_sw); | |
41e9a804 TQ |
274 | |
275 | printf("Test HW_CACHE_L1D\n"); | |
276 | test_perf_event_all_cpu(&attr_hw_cache_l1d); | |
277 | test_perf_event_task(&attr_hw_cache_l1d); | |
278 | ||
279 | printf("Test HW_CACHE_BPU\n"); | |
280 | test_perf_event_all_cpu(&attr_hw_cache_branch_miss); | |
281 | test_perf_event_task(&attr_hw_cache_branch_miss); | |
282 | ||
283 | printf("Test Instruction Retired\n"); | |
284 | test_perf_event_all_cpu(&attr_type_raw); | |
285 | test_perf_event_task(&attr_type_raw); | |
286 | ||
12fe1225 TQ |
287 | printf("Test Lock Load\n"); |
288 | test_perf_event_all_cpu(&attr_type_raw_lock_load); | |
289 | test_perf_event_task(&attr_type_raw_lock_load); | |
290 | ||
41e9a804 | 291 | printf("*** PASS ***\n"); |
1c47910e AS |
292 | } |
293 | ||
294 | ||
295 | int main(int argc, char **argv) | |
296 | { | |
aa5e2af6 | 297 | struct bpf_object *obj = NULL; |
1c47910e | 298 | char filename[256]; |
aa5e2af6 | 299 | int error = 1; |
1c47910e AS |
300 | |
301 | snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]); | |
1c47910e | 302 | |
aa5e2af6 DL |
303 | signal(SIGINT, err_exit); |
304 | signal(SIGTERM, err_exit); | |
1c47910e AS |
305 | |
306 | if (load_kallsyms()) { | |
307 | printf("failed to process /proc/kallsyms\n"); | |
aa5e2af6 DL |
308 | goto cleanup; |
309 | } | |
310 | ||
311 | obj = bpf_object__open_file(filename, NULL); | |
0efdcefb | 312 | if (libbpf_get_error(obj)) { |
aa5e2af6 DL |
313 | printf("opening BPF object file failed\n"); |
314 | obj = NULL; | |
315 | goto cleanup; | |
316 | } | |
317 | ||
318 | prog = bpf_object__find_program_by_name(obj, "bpf_prog1"); | |
319 | if (!prog) { | |
320 | printf("finding a prog in obj file failed\n"); | |
321 | goto cleanup; | |
322 | } | |
323 | ||
324 | /* load BPF program */ | |
325 | if (bpf_object__load(obj)) { | |
326 | printf("loading BPF object file failed\n"); | |
327 | goto cleanup; | |
1c47910e AS |
328 | } |
329 | ||
aa5e2af6 DL |
330 | map_fd[0] = bpf_object__find_map_fd_by_name(obj, "counts"); |
331 | map_fd[1] = bpf_object__find_map_fd_by_name(obj, "stackmap"); | |
332 | if (map_fd[0] < 0 || map_fd[1] < 0) { | |
333 | printf("finding a counts/stackmap map in obj file failed\n"); | |
334 | goto cleanup; | |
1c47910e AS |
335 | } |
336 | ||
aa5e2af6 DL |
337 | pid = fork(); |
338 | if (pid == 0) { | |
1c47910e AS |
339 | read_trace_pipe(); |
340 | return 0; | |
aa5e2af6 DL |
341 | } else if (pid == -1) { |
342 | printf("couldn't spawn process\n"); | |
343 | goto cleanup; | |
1c47910e | 344 | } |
aa5e2af6 | 345 | |
1c47910e | 346 | test_bpf_perf_event(); |
aa5e2af6 DL |
347 | error = 0; |
348 | ||
349 | cleanup: | |
350 | bpf_object__close(obj); | |
351 | err_exit(error); | |
1c47910e | 352 | } |