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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 | // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) // Copyright (c) 2022, Huawei #include "vmlinux.h" #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> #define KWORK_COUNT 100 #define MAX_KWORKNAME 128 /* * This should be in sync with "util/kwork.h" */ enum kwork_class_type { KWORK_CLASS_IRQ, KWORK_CLASS_SOFTIRQ, KWORK_CLASS_WORKQUEUE, KWORK_CLASS_MAX, }; struct work_key { __u32 type; __u32 cpu; __u64 id; }; struct report_data { __u64 nr; __u64 total_time; __u64 max_time; __u64 max_time_start; __u64 max_time_end; }; struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(key_size, sizeof(struct work_key)); __uint(value_size, MAX_KWORKNAME); __uint(max_entries, KWORK_COUNT); } perf_kwork_names SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(key_size, sizeof(struct work_key)); __uint(value_size, sizeof(__u64)); __uint(max_entries, KWORK_COUNT); } perf_kwork_time SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(key_size, sizeof(struct work_key)); __uint(value_size, sizeof(struct report_data)); __uint(max_entries, KWORK_COUNT); } perf_kwork_report SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_HASH); __uint(key_size, sizeof(__u32)); __uint(value_size, sizeof(__u8)); __uint(max_entries, 1); } perf_kwork_cpu_filter SEC(".maps"); struct { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(key_size, sizeof(__u32)); __uint(value_size, MAX_KWORKNAME); __uint(max_entries, 1); } perf_kwork_name_filter SEC(".maps"); int enabled = 0; int has_cpu_filter = 0; int has_name_filter = 0; static __always_inline int local_strncmp(const char *s1, unsigned int sz, const char *s2) { int ret = 0; unsigned int i; for (i = 0; i < sz; i++) { ret = (unsigned char)s1[i] - (unsigned char)s2[i]; if (ret || !s1[i] || !s2[i]) break; } return ret; } static __always_inline int trace_event_match(struct work_key *key, char *name) { __u8 *cpu_val; char *name_val; __u32 zero = 0; __u32 cpu = bpf_get_smp_processor_id(); if (!enabled) return 0; if (has_cpu_filter) { cpu_val = bpf_map_lookup_elem(&perf_kwork_cpu_filter, &cpu); if (!cpu_val) return 0; } if (has_name_filter && (name != NULL)) { name_val = bpf_map_lookup_elem(&perf_kwork_name_filter, &zero); if (name_val && (local_strncmp(name_val, MAX_KWORKNAME, name) != 0)) { return 0; } } return 1; } static __always_inline void do_update_time(void *map, struct work_key *key, __u64 time_start, __u64 time_end) { struct report_data zero, *data; __s64 delta = time_end - time_start; if (delta < 0) return; data = bpf_map_lookup_elem(map, key); if (!data) { __builtin_memset(&zero, 0, sizeof(zero)); bpf_map_update_elem(map, key, &zero, BPF_NOEXIST); data = bpf_map_lookup_elem(map, key); if (!data) return; } if ((delta > data->max_time) || (data->max_time == 0)) { data->max_time = delta; data->max_time_start = time_start; data->max_time_end = time_end; } data->total_time += delta; data->nr++; } static __always_inline void do_update_timestart(void *map, struct work_key *key) { __u64 ts = bpf_ktime_get_ns(); bpf_map_update_elem(map, key, &ts, BPF_ANY); } static __always_inline void do_update_timeend(void *report_map, void *time_map, struct work_key *key) { __u64 *time = bpf_map_lookup_elem(time_map, key); if (time) { bpf_map_delete_elem(time_map, key); do_update_time(report_map, key, *time, bpf_ktime_get_ns()); } } static __always_inline void do_update_name(void *map, struct work_key *key, char *name) { if (!bpf_map_lookup_elem(map, key)) bpf_map_update_elem(map, key, name, BPF_ANY); } static __always_inline int update_timestart(void *map, struct work_key *key) { if (!trace_event_match(key, NULL)) return 0; do_update_timestart(map, key); return 0; } static __always_inline int update_timestart_and_name(void *time_map, void *names_map, struct work_key *key, char *name) { if (!trace_event_match(key, name)) return 0; do_update_timestart(time_map, key); do_update_name(names_map, key, name); return 0; } static __always_inline int update_timeend(void *report_map, void *time_map, struct work_key *key) { if (!trace_event_match(key, NULL)) return 0; do_update_timeend(report_map, time_map, key); return 0; } static __always_inline int update_timeend_and_name(void *report_map, void *time_map, void *names_map, struct work_key *key, char *name) { if (!trace_event_match(key, name)) return 0; do_update_timeend(report_map, time_map, key); do_update_name(names_map, key, name); return 0; } SEC("tracepoint/irq/irq_handler_entry") int report_irq_handler_entry(struct trace_event_raw_irq_handler_entry *ctx) { char name[MAX_KWORKNAME]; struct work_key key = { .type = KWORK_CLASS_IRQ, .cpu = bpf_get_smp_processor_id(), .id = (__u64)ctx->irq, }; void *name_addr = (void *)ctx + (ctx->__data_loc_name & 0xffff); bpf_probe_read_kernel_str(name, sizeof(name), name_addr); return update_timestart_and_name(&perf_kwork_time, &perf_kwork_names, &key, name); } SEC("tracepoint/irq/irq_handler_exit") int report_irq_handler_exit(struct trace_event_raw_irq_handler_exit *ctx) { struct work_key key = { .type = KWORK_CLASS_IRQ, .cpu = bpf_get_smp_processor_id(), .id = (__u64)ctx->irq, }; return update_timeend(&perf_kwork_report, &perf_kwork_time, &key); } static char softirq_name_list[NR_SOFTIRQS][MAX_KWORKNAME] = { { "HI" }, { "TIMER" }, { "NET_TX" }, { "NET_RX" }, { "BLOCK" }, { "IRQ_POLL" }, { "TASKLET" }, { "SCHED" }, { "HRTIMER" }, { "RCU" }, }; SEC("tracepoint/irq/softirq_entry") int report_softirq_entry(struct trace_event_raw_softirq *ctx) { unsigned int vec = ctx->vec; struct work_key key = { .type = KWORK_CLASS_SOFTIRQ, .cpu = bpf_get_smp_processor_id(), .id = (__u64)vec, }; if (vec < NR_SOFTIRQS) { return update_timestart_and_name(&perf_kwork_time, &perf_kwork_names, &key, softirq_name_list[vec]); } return 0; } SEC("tracepoint/irq/softirq_exit") int report_softirq_exit(struct trace_event_raw_softirq *ctx) { struct work_key key = { .type = KWORK_CLASS_SOFTIRQ, .cpu = bpf_get_smp_processor_id(), .id = (__u64)ctx->vec, }; return update_timeend(&perf_kwork_report, &perf_kwork_time, &key); } SEC("tracepoint/irq/softirq_raise") int latency_softirq_raise(struct trace_event_raw_softirq *ctx) { unsigned int vec = ctx->vec; struct work_key key = { .type = KWORK_CLASS_SOFTIRQ, .cpu = bpf_get_smp_processor_id(), .id = (__u64)vec, }; if (vec < NR_SOFTIRQS) { return update_timestart_and_name(&perf_kwork_time, &perf_kwork_names, &key, softirq_name_list[vec]); } return 0; } SEC("tracepoint/irq/softirq_entry") int latency_softirq_entry(struct trace_event_raw_softirq *ctx) { struct work_key key = { .type = KWORK_CLASS_SOFTIRQ, .cpu = bpf_get_smp_processor_id(), .id = (__u64)ctx->vec, }; return update_timeend(&perf_kwork_report, &perf_kwork_time, &key); } SEC("tracepoint/workqueue/workqueue_execute_start") int report_workqueue_execute_start(struct trace_event_raw_workqueue_execute_start *ctx) { struct work_key key = { .type = KWORK_CLASS_WORKQUEUE, .cpu = bpf_get_smp_processor_id(), .id = (__u64)ctx->work, }; return update_timestart(&perf_kwork_time, &key); } SEC("tracepoint/workqueue/workqueue_execute_end") int report_workqueue_execute_end(struct trace_event_raw_workqueue_execute_end *ctx) { char name[MAX_KWORKNAME]; struct work_key key = { .type = KWORK_CLASS_WORKQUEUE, .cpu = bpf_get_smp_processor_id(), .id = (__u64)ctx->work, }; unsigned long long func_addr = (unsigned long long)ctx->function; __builtin_memset(name, 0, sizeof(name)); bpf_snprintf(name, sizeof(name), "%ps", &func_addr, sizeof(func_addr)); return update_timeend_and_name(&perf_kwork_report, &perf_kwork_time, &perf_kwork_names, &key, name); } SEC("tracepoint/workqueue/workqueue_activate_work") int latency_workqueue_activate_work(struct trace_event_raw_workqueue_activate_work *ctx) { struct work_key key = { .type = KWORK_CLASS_WORKQUEUE, .cpu = bpf_get_smp_processor_id(), .id = (__u64)ctx->work, }; return update_timestart(&perf_kwork_time, &key); } SEC("tracepoint/workqueue/workqueue_execute_start") int latency_workqueue_execute_start(struct trace_event_raw_workqueue_execute_start *ctx) { char name[MAX_KWORKNAME]; struct work_key key = { .type = KWORK_CLASS_WORKQUEUE, .cpu = bpf_get_smp_processor_id(), .id = (__u64)ctx->work, }; unsigned long long func_addr = (unsigned long long)ctx->function; __builtin_memset(name, 0, sizeof(name)); bpf_snprintf(name, sizeof(name), "%ps", &func_addr, sizeof(func_addr)); return update_timeend_and_name(&perf_kwork_report, &perf_kwork_time, &perf_kwork_names, &key, name); } char LICENSE[] SEC("license") = "Dual BSD/GPL"; |