1 /* Copyright (c) 2016 Facebook
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.
14 #include <sys/ioctl.h>
15 #include <linux/perf_event.h>
16 #include <linux/bpf.h>
20 #include <sys/resource.h>
24 #include "trace_helpers.h"
26 #define SAMPLE_FREQ 50
28 static bool sys_read_seen, sys_write_seen;
30 static void print_ksym(__u64 addr)
36 sym = ksym_search(addr);
37 printf("%s;", sym->name);
38 if (!strcmp(sym->name, "sys_read"))
40 else if (!strcmp(sym->name, "sys_write"))
41 sys_write_seen = true;
44 static void print_addr(__u64 addr)
48 printf("%llx;", addr);
51 #define TASK_COMM_LEN 16
54 char comm[TASK_COMM_LEN];
59 static void print_stack(struct key_t *key, __u64 count)
61 __u64 ip[PERF_MAX_STACK_DEPTH] = {};
65 printf("%3lld %s;", count, key->comm);
66 if (bpf_map_lookup_elem(map_fd[1], &key->kernstack, ip) != 0) {
69 for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--)
73 if (bpf_map_lookup_elem(map_fd[1], &key->userstack, ip) != 0) {
76 for (i = PERF_MAX_STACK_DEPTH - 1; i >= 0; i--)
84 if (key->kernstack == -EEXIST && !warned) {
85 printf("stackmap collisions seen. Consider increasing size\n");
87 } else if ((int)key->kernstack < 0 && (int)key->userstack < 0) {
88 printf("err stackid %d %d\n", key->kernstack, key->userstack);
92 static void int_exit(int sig)
98 static void print_stacks(void)
100 struct key_t key = {}, next_key;
102 __u32 stackid = 0, next_id;
103 int fd = map_fd[0], stack_map = map_fd[1];
105 sys_read_seen = sys_write_seen = false;
106 while (bpf_map_get_next_key(fd, &key, &next_key) == 0) {
107 bpf_map_lookup_elem(fd, &next_key, &value);
108 print_stack(&next_key, value);
109 bpf_map_delete_elem(fd, &next_key);
113 if (!sys_read_seen || !sys_write_seen) {
114 printf("BUG kernel stack doesn't contain sys_read() and sys_write()\n");
118 /* clear stack map */
119 while (bpf_map_get_next_key(stack_map, &stackid, &next_id) == 0) {
120 bpf_map_delete_elem(stack_map, &next_id);
125 static void test_perf_event_all_cpu(struct perf_event_attr *attr)
127 int nr_cpus = sysconf(_SC_NPROCESSORS_CONF);
128 int *pmu_fd = malloc(nr_cpus * sizeof(int));
131 /* system wide perf event, no need to inherit */
134 /* open perf_event on all cpus */
135 for (i = 0; i < nr_cpus; i++) {
136 pmu_fd[i] = sys_perf_event_open(attr, -1, i, -1, 0);
138 printf("sys_perf_event_open failed\n");
142 assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
143 assert(ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE) == 0);
145 system("dd if=/dev/zero of=/dev/null count=5000k status=none");
148 for (i--; i >= 0; i--) {
149 ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE);
157 static void test_perf_event_task(struct perf_event_attr *attr)
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.
166 /* open task bound event */
167 pmu_fd = sys_perf_event_open(attr, 0, -1, -1, 0);
169 printf("sys_perf_event_open failed\n");
172 assert(ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd[0]) == 0);
173 assert(ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE) == 0);
174 system("dd if=/dev/zero of=/dev/null count=5000k status=none");
176 ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
180 static void test_bpf_perf_event(void)
182 struct perf_event_attr attr_type_hw = {
183 .sample_freq = SAMPLE_FREQ,
185 .type = PERF_TYPE_HARDWARE,
186 .config = PERF_COUNT_HW_CPU_CYCLES,
188 struct perf_event_attr attr_type_sw = {
189 .sample_freq = SAMPLE_FREQ,
191 .type = PERF_TYPE_SOFTWARE,
192 .config = PERF_COUNT_SW_CPU_CLOCK,
194 struct perf_event_attr attr_hw_cache_l1d = {
195 .sample_freq = SAMPLE_FREQ,
197 .type = PERF_TYPE_HW_CACHE,
199 PERF_COUNT_HW_CACHE_L1D |
200 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
201 (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16),
203 struct perf_event_attr attr_hw_cache_branch_miss = {
204 .sample_freq = SAMPLE_FREQ,
206 .type = PERF_TYPE_HW_CACHE,
208 PERF_COUNT_HW_CACHE_BPU |
209 (PERF_COUNT_HW_CACHE_OP_READ << 8) |
210 (PERF_COUNT_HW_CACHE_RESULT_MISS << 16),
212 struct perf_event_attr attr_type_raw = {
213 .sample_freq = SAMPLE_FREQ,
215 .type = PERF_TYPE_RAW,
216 /* Intel Instruction Retired */
219 struct perf_event_attr attr_type_raw_lock_load = {
220 .sample_freq = SAMPLE_FREQ,
222 .type = PERF_TYPE_RAW,
223 /* Intel MEM_UOPS_RETIRED.LOCK_LOADS */
225 /* Request to record lock address from PEBS */
226 .sample_type = PERF_SAMPLE_ADDR,
227 /* Record address value requires precise event */
231 printf("Test HW_CPU_CYCLES\n");
232 test_perf_event_all_cpu(&attr_type_hw);
233 test_perf_event_task(&attr_type_hw);
235 printf("Test SW_CPU_CLOCK\n");
236 test_perf_event_all_cpu(&attr_type_sw);
237 test_perf_event_task(&attr_type_sw);
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);
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);
247 printf("Test Instruction Retired\n");
248 test_perf_event_all_cpu(&attr_type_raw);
249 test_perf_event_task(&attr_type_raw);
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);
255 printf("*** PASS ***\n");
259 int main(int argc, char **argv)
261 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
264 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
265 setrlimit(RLIMIT_MEMLOCK, &r);
267 signal(SIGINT, int_exit);
268 signal(SIGTERM, int_exit);
270 if (load_kallsyms()) {
271 printf("failed to process /proc/kallsyms\n");
275 if (load_bpf_file(filename)) {
276 printf("%s", bpf_log_buf);
284 test_bpf_perf_event();