| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | #include "ebpf.h" |
| 4 | #include "ebpf_sync.h" |
| 5 | #include "libbpf_api/ebpf_library.h" |
| 6 | |
| 7 | static char *sync_counter_dimension_name[NETDATA_SYNC_IDX_END] = |
| 8 | {"sync", "syncfs", "msync", "fsync", "fdatasync", "sync_file_range"}; |
| 9 | static netdata_syscall_stat_t sync_counter_aggregated_data[NETDATA_SYNC_IDX_END]; |
| 10 | static netdata_publish_syscall_t sync_counter_publish_aggregated[NETDATA_SYNC_IDX_END]; |
| 11 | |
| 12 | static netdata_idx_t sync_hash_values[NETDATA_SYNC_IDX_END]; |
| 13 | |
| 14 | static ebpf_local_maps_t sync_maps[NETDATA_SYNC_IDX_END][2]; |
| 15 | |
| 16 | static void ebpf_initialize_sync_maps(void) |
| 17 | { |
| 18 | static const char *map_names[NETDATA_SYNC_IDX_END] = { |
| 19 | "tbl_sync", "tbl_syncfs", "tbl_msync", "tbl_fsync", "tbl_fdatasync", "tbl_syncfr"}; |
| 20 | |
| 21 | for (int i = 0; i < NETDATA_SYNC_IDX_END; i++) { |
| 22 | sync_maps[i][0] = (ebpf_local_maps_t){ |
| 23 | .name = map_names[i], |
| 24 | .internal_input = NETDATA_SYNC_END, |
| 25 | .user_input = 0, |
| 26 | .type = NETDATA_EBPF_MAP_STATIC, |
| 27 | .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED, |
| 28 | #ifdef LIBBPF_MAJOR_VERSION |
| 29 | .map_type = BPF_MAP_TYPE_PERCPU_ARRAY |
| 30 | #endif |
| 31 | }; |
| 32 | sync_maps[i][1] = (ebpf_local_maps_t){ |
| 33 | .name = NULL, |
| 34 | .internal_input = 0, |
| 35 | .user_input = 0, |
| 36 | .type = NETDATA_EBPF_MAP_CONTROLLER, |
| 37 | .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED, |
| 38 | #ifdef LIBBPF_MAJOR_VERSION |
| 39 | .map_type = BPF_MAP_TYPE_PERCPU_ARRAY |
| 40 | #endif |
| 41 | }; |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | struct config sync_config = APPCONFIG_INITIALIZER; |
| 46 | |
| 47 | netdata_ebpf_targets_t sync_targets[] = { |
| 48 | {.name = NETDATA_SYSCALLS_SYNC, .mode = EBPF_LOAD_TRAMPOLINE}, |
| 49 | {.name = NETDATA_SYSCALLS_SYNCFS, .mode = EBPF_LOAD_TRAMPOLINE}, |
| 50 | {.name = NETDATA_SYSCALLS_MSYNC, .mode = EBPF_LOAD_TRAMPOLINE}, |
| 51 | {.name = NETDATA_SYSCALLS_FSYNC, .mode = EBPF_LOAD_TRAMPOLINE}, |
| 52 | {.name = NETDATA_SYSCALLS_FDATASYNC, .mode = EBPF_LOAD_TRAMPOLINE}, |
| 53 | {.name = NETDATA_SYSCALLS_SYNC_FILE_RANGE, .mode = EBPF_LOAD_TRAMPOLINE}, |
| 54 | {.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}}; |
| 55 | |
| 56 | #ifdef LIBBPF_MAJOR_VERSION |
| 57 | /***************************************************************** |
| 58 | * |
| 59 | * BTF FUNCTIONS |
| 60 | * |
| 61 | *****************************************************************/ |
| 62 | |
| 63 | /** |
| 64 | * Disable probe |
| 65 | * |
| 66 | * Disable kprobe to use another method. |
| 67 | * |
| 68 | * @param obj is the main structure for bpf objects. |
| 69 | */ |
| 70 | static inline void ebpf_sync_disable_probe(struct sync_bpf *obj) |
| 71 | { |
| 72 | bpf_program__set_autoload(obj->progs.netdata_sync_kprobe, false); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Disable trampoline |
| 77 | * |
| 78 | * Disable trampoline to use another method. |
| 79 | * |
| 80 | * @param obj is the main structure for bpf objects. |
| 81 | */ |
| 82 | static inline void ebpf_sync_disable_trampoline(struct sync_bpf *obj) |
| 83 | { |
| 84 | bpf_program__set_autoload(obj->progs.netdata_sync_fentry, false); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Disable tracepoint |
| 89 | * |
| 90 | * Disable tracepoints according information given. |
| 91 | * |
| 92 | * @param obj object loaded |
| 93 | * @param idx Which syscall will not be disabled |
| 94 | */ |
| 95 | void ebpf_sync_disable_tracepoints(struct sync_bpf *obj, sync_syscalls_index_t idx) |
| 96 | { |
| 97 | if (idx != NETDATA_SYNC_SYNC_IDX) |
| 98 | bpf_program__set_autoload(obj->progs.netdata_sync_entry, false); |
| 99 | |
| 100 | if (idx != NETDATA_SYNC_SYNCFS_IDX) |
| 101 | bpf_program__set_autoload(obj->progs.netdata_syncfs_entry, false); |
| 102 | |
| 103 | if (idx != NETDATA_SYNC_MSYNC_IDX) |
| 104 | bpf_program__set_autoload(obj->progs.netdata_msync_entry, false); |
| 105 | |
| 106 | if (idx != NETDATA_SYNC_FSYNC_IDX) |
| 107 | bpf_program__set_autoload(obj->progs.netdata_fsync_entry, false); |
| 108 | |
| 109 | if (idx != NETDATA_SYNC_FDATASYNC_IDX) |
| 110 | bpf_program__set_autoload(obj->progs.netdata_fdatasync_entry, false); |
| 111 | |
| 112 | if (idx != NETDATA_SYNC_SYNC_FILE_RANGE_IDX) |
| 113 | bpf_program__set_autoload(obj->progs.netdata_sync_file_range_entry, false); |
| 114 | } |
| 115 | |
| 116 | /** |
| 117 | * Set hash tables |
| 118 | * |
| 119 | * Set the values for maps according the value given by kernel. |
| 120 | * |
| 121 | * @param map the map loaded. |
| 122 | * @param obj the main structure for bpf objects. |
| 123 | */ |
| 124 | static void ebpf_sync_set_hash_tables(ebpf_local_maps_t *map, struct sync_bpf *obj) |
| 125 | { |
| 126 | map->map_fd = bpf_map__fd(obj->maps.tbl_sync); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Load and attach |
| 131 | * |
| 132 | * Load and attach the eBPF code in kernel. |
| 133 | * |
| 134 | * @param obj is the main structure for bpf objects. |
| 135 | * @param em the structure with configuration |
| 136 | * @param target the syscall that we are attaching a tracer. |
| 137 | * @param idx the index for the main structure |
| 138 | * |
| 139 | * @return it returns 0 on success and -1 otherwise |
| 140 | */ |
| 141 | static inline int |
| 142 | ebpf_sync_load_and_attach(struct sync_bpf *obj, ebpf_module_t *em, char *target, sync_syscalls_index_t idx) |
| 143 | { |
| 144 | netdata_ebpf_targets_t *synct = em->targets; |
| 145 | netdata_ebpf_program_loaded_t mode = synct[NETDATA_SYNC_SYNC_IDX].mode; |
| 146 | |
| 147 | if (mode == EBPF_LOAD_TRAMPOLINE) { |
| 148 | ebpf_sync_disable_probe(obj); |
| 149 | ebpf_sync_disable_tracepoints(obj, NETDATA_SYNC_IDX_END); |
| 150 | |
| 151 | bpf_program__set_attach_target(obj->progs.netdata_sync_fentry, 0, target); |
| 152 | } else if (mode == EBPF_LOAD_PROBE || mode == EBPF_LOAD_RETPROBE) { |
| 153 | ebpf_sync_disable_tracepoints(obj, NETDATA_SYNC_IDX_END); |
| 154 | ebpf_sync_disable_trampoline(obj); |
| 155 | } else { |
| 156 | ebpf_sync_disable_probe(obj); |
| 157 | ebpf_sync_disable_trampoline(obj); |
| 158 | |
| 159 | ebpf_sync_disable_tracepoints(obj, idx); |
| 160 | } |
| 161 | |
| 162 | ebpf_update_map_type(obj->maps.tbl_sync, &em->maps[NETDATA_SYNC_GLOBAL_TABLE]); |
| 163 | |
| 164 | int ret = sync_bpf__load(obj); |
| 165 | if (!ret) { |
| 166 | if (mode != EBPF_LOAD_PROBE && mode != EBPF_LOAD_RETPROBE) { |
| 167 | ret = sync_bpf__attach(obj); |
| 168 | } else { |
| 169 | obj->links.netdata_sync_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_sync_kprobe, false, target); |
| 170 | ret = (int)libbpf_get_error(obj->links.netdata_sync_kprobe); |
| 171 | } |
| 172 | |
| 173 | if (!ret) |
| 174 | ebpf_sync_set_hash_tables(&em->maps[NETDATA_SYNC_GLOBAL_TABLE], obj); |
| 175 | } |
| 176 | |
| 177 | return ret; |
| 178 | } |
| 179 | #endif |
| 180 | |
| 181 | /***************************************************************** |
| 182 | * |
| 183 | * CLEANUP THREAD |
| 184 | * |
| 185 | *****************************************************************/ |
| 186 | |
| 187 | /** |
| 188 | * Cleanup Objects |
| 189 | * |
| 190 | * Cleanup loaded objects when thread was initialized. |
| 191 | */ |
| 192 | void ebpf_sync_cleanup_objects() |
| 193 | { |
| 194 | int i; |
| 195 | for (i = 0; i < NETDATA_SYNC_IDX_END; i++) { |
| 196 | ebpf_sync_syscalls_t *w = &local_syscalls[i]; |
| 197 | #ifdef LIBBPF_MAJOR_VERSION |
| 198 | if (w->sync_obj) { |
| 199 | sync_bpf__destroy(w->sync_obj); |
| 200 | w->sync_obj = NULL; |
| 201 | } |
| 202 | #endif |
| 203 | if (w->probe_links) { |
| 204 | ebpf_unload_legacy_code(w->objects, w->probe_links); |
| 205 | w->objects = NULL; |
| 206 | w->probe_links = NULL; |
| 207 | } |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | /** |
| 212 | * Obsolete global |
| 213 | * |
| 214 | * Obsolete global charts created by thread. |
| 215 | * |
| 216 | * @param em a pointer to `struct ebpf_module` |
| 217 | */ |
| 218 | static void ebpf_obsolete_sync_global(ebpf_module_t *em) |
| 219 | { |
| 220 | if (local_syscalls[NETDATA_SYNC_FSYNC_IDX].enabled && local_syscalls[NETDATA_SYNC_FDATASYNC_IDX].enabled) |
| 221 | ebpf_write_chart_obsolete( |
| 222 | NETDATA_EBPF_MEMORY_GROUP, |
| 223 | NETDATA_EBPF_FILE_SYNC_CHART, |
| 224 | "", |
| 225 | "Monitor calls to fsync(2) and fdatasync(2).", |
| 226 | EBPF_COMMON_UNITS_CALLS_PER_SEC, |
| 227 | NETDATA_EBPF_SYNC_SUBMENU, |
| 228 | NETDATA_EBPF_CHART_TYPE_LINE, |
| 229 | "mem.file_sync", |
| 230 | NETDATA_EBPF_FILE_SYNC_CHART_ORDER, |
| 231 | em->update_every); |
| 232 | |
| 233 | if (local_syscalls[NETDATA_SYNC_MSYNC_IDX].enabled) |
| 234 | ebpf_write_chart_obsolete( |
| 235 | NETDATA_EBPF_MEMORY_GROUP, |
| 236 | NETDATA_EBPF_MSYNC_CHART, |
| 237 | "", |
| 238 | "Monitor calls to msync(2).", |
| 239 | EBPF_COMMON_UNITS_CALLS_PER_SEC, |
| 240 | NETDATA_EBPF_SYNC_SUBMENU, |
| 241 | NETDATA_EBPF_CHART_TYPE_LINE, |
| 242 | "mem.memory_map", |
| 243 | NETDATA_EBPF_MSYNC_CHART_ORDER, |
| 244 | em->update_every); |
| 245 | |
| 246 | if (local_syscalls[NETDATA_SYNC_SYNC_IDX].enabled && local_syscalls[NETDATA_SYNC_SYNCFS_IDX].enabled) |
| 247 | ebpf_write_chart_obsolete( |
| 248 | NETDATA_EBPF_MEMORY_GROUP, |
| 249 | NETDATA_EBPF_SYNC_CHART, |
| 250 | "", |
| 251 | "Monitor calls to sync(2) and syncfs(2).", |
| 252 | EBPF_COMMON_UNITS_CALLS_PER_SEC, |
| 253 | NETDATA_EBPF_SYNC_SUBMENU, |
| 254 | NETDATA_EBPF_CHART_TYPE_LINE, |
| 255 | "mem.sync", |
| 256 | NETDATA_EBPF_SYNC_CHART_ORDER, |
| 257 | em->update_every); |
| 258 | |
| 259 | if (local_syscalls[NETDATA_SYNC_SYNC_FILE_RANGE_IDX].enabled) |
| 260 | ebpf_write_chart_obsolete( |
| 261 | NETDATA_EBPF_MEMORY_GROUP, |
| 262 | NETDATA_EBPF_FILE_SEGMENT_CHART, |
| 263 | "", |
| 264 | "Monitor calls to sync_file_range(2).", |
| 265 | EBPF_COMMON_UNITS_CALLS_PER_SEC, |
| 266 | NETDATA_EBPF_SYNC_SUBMENU, |
| 267 | NETDATA_EBPF_CHART_TYPE_LINE, |
| 268 | "mem.file_segment", |
| 269 | NETDATA_EBPF_FILE_SEGMENT_CHART_ORDER, |
| 270 | em->update_every); |
| 271 | } |
| 272 | |
| 273 | /** |
| 274 | * Exit |
| 275 | * |
| 276 | * Clean up the main thread. |
| 277 | * |
| 278 | * @param ptr thread data. |
| 279 | */ |
| 280 | void ebpf_sync_unload_bpf(ebpf_module_t *em __maybe_unused) |
| 281 | { |
| 282 | ebpf_sync_cleanup_objects(); |
| 283 | } |
| 284 | |
| 285 | static void ebpf_sync_exit(void *pptr) |
| 286 | { |
| 287 | ebpf_module_t *em = CLEANUP_FUNCTION_GET_PTR(pptr); |
| 288 | if (!em) |
| 289 | return; |
| 290 | |
| 291 | if (ebpf_module_enabled_get(em) == NETDATA_THREAD_EBPF_FUNCTION_RUNNING && !ebpf_plugin_stop()) { |
| 292 | netdata_mutex_lock(&lock); |
| 293 | ebpf_obsolete_sync_global(em); |
| 294 | netdata_mutex_unlock(&lock); |
| 295 | } |
| 296 | |
| 297 | if (!ebpf_plugin_stop() && em->functions.bpf_unload) |
| 298 | em->functions.bpf_unload(em); |
| 299 | |
| 300 | netdata_mutex_lock(&ebpf_exit_cleanup); |
| 301 | ebpf_module_enabled_set(em, NETDATA_THREAD_EBPF_STOPPED); |
| 302 | netdata_mutex_unlock(&ebpf_exit_cleanup); |
| 303 | } |
| 304 | |
| 305 | /***************************************************************** |
| 306 | * |
| 307 | * INITIALIZE THREAD |
| 308 | * |
| 309 | *****************************************************************/ |
| 310 | |
| 311 | /** |
| 312 | * Load Legacy |
| 313 | * |
| 314 | * Load legacy code. |
| 315 | * |
| 316 | * @param w is the sync output structure with pointers to objects loaded. |
| 317 | * @param em is structure with configuration |
| 318 | * |
| 319 | * @return 0 on success and -1 otherwise. |
| 320 | */ |
| 321 | static int ebpf_sync_load_legacy(ebpf_sync_syscalls_t *w, ebpf_module_t *em) |
| 322 | { |
| 323 | em->info.thread_name = w->syscall; |
| 324 | if (!w->probe_links) { |
| 325 | w->probe_links = ebpf_load_program(ebpf_plugin_dir, em, running_on_kernel, isrh, &w->objects); |
| 326 | if (!w->probe_links) { |
| 327 | return -1; |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | return 0; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Initialize Syscalls |
| 336 | * |
| 337 | * Load the eBPF programs to monitor syscalls |
| 338 | * |
| 339 | * @return 0 on success and -1 otherwise. |
| 340 | */ |
| 341 | static int ebpf_sync_initialize_syscall(ebpf_module_t *em) |
| 342 | { |
| 343 | #ifdef LIBBPF_MAJOR_VERSION |
| 344 | ebpf_define_map_type(sync_maps[NETDATA_SYNC_SYNC_IDX], em->maps_per_core, running_on_kernel); |
| 345 | ebpf_define_map_type(sync_maps[NETDATA_SYNC_SYNCFS_IDX], em->maps_per_core, running_on_kernel); |
| 346 | ebpf_define_map_type(sync_maps[NETDATA_SYNC_MSYNC_IDX], em->maps_per_core, running_on_kernel); |
| 347 | ebpf_define_map_type(sync_maps[NETDATA_SYNC_FSYNC_IDX], em->maps_per_core, running_on_kernel); |
| 348 | ebpf_define_map_type(sync_maps[NETDATA_SYNC_FDATASYNC_IDX], em->maps_per_core, running_on_kernel); |
| 349 | ebpf_define_map_type(sync_maps[NETDATA_SYNC_SYNC_FILE_RANGE_IDX], em->maps_per_core, running_on_kernel); |
| 350 | #endif |
| 351 | |
| 352 | int i; |
| 353 | const char *saved_name = em->info.thread_name; |
| 354 | int errors = 0; |
| 355 | for (i = 0; i < NETDATA_SYNC_IDX_END; i++) { |
| 356 | ebpf_sync_syscalls_t *w = &local_syscalls[i]; |
| 357 | w->sync_maps = local_syscalls[i].sync_maps; |
| 358 | em->maps = local_syscalls[i].sync_maps; |
| 359 | if (w->enabled) { |
| 360 | if (em->load & EBPF_LOAD_LEGACY) { |
| 361 | if (ebpf_sync_load_legacy(w, em)) |
| 362 | errors++; |
| 363 | else |
| 364 | ebpf_mark_program_loaded(); |
| 365 | |
| 366 | em->info.thread_name = saved_name; |
| 367 | } |
| 368 | #ifdef LIBBPF_MAJOR_VERSION |
| 369 | else { |
| 370 | char syscall[NETDATA_EBPF_MAX_SYSCALL_LENGTH]; |
| 371 | ebpf_select_host_prefix(syscall, NETDATA_EBPF_MAX_SYSCALL_LENGTH, w->syscall, running_on_kernel); |
| 372 | if (ebpf_is_function_inside_btf(default_btf, syscall)) { |
| 373 | w->sync_obj = sync_bpf__open(); |
| 374 | if (!w->sync_obj) { |
| 375 | w->enabled = false; |
| 376 | errors++; |
| 377 | } else { |
| 378 | if (ebpf_sync_load_and_attach(w->sync_obj, em, syscall, i)) { |
| 379 | sync_bpf__destroy(w->sync_obj); |
| 380 | w->sync_obj = NULL; |
| 381 | w->enabled = false; |
| 382 | errors++; |
| 383 | } else { |
| 384 | ebpf_mark_program_loaded(); |
| 385 | } |
| 386 | } |
| 387 | } else { |
| 388 | netdata_log_info("Cannot find syscall %s we are not going to monitor it.", syscall); |
| 389 | w->enabled = false; |
| 390 | } |
| 391 | |
| 392 | em->info.thread_name = saved_name; |
| 393 | } |
| 394 | #endif |
| 395 | } |
| 396 | } |
| 397 | em->info.thread_name = saved_name; |
| 398 | |
| 399 | memset(sync_counter_aggregated_data, 0, NETDATA_SYNC_IDX_END * sizeof(netdata_syscall_stat_t)); |
| 400 | memset(sync_counter_publish_aggregated, 0, NETDATA_SYNC_IDX_END * sizeof(netdata_publish_syscall_t)); |
| 401 | memset(sync_hash_values, 0, NETDATA_SYNC_IDX_END * sizeof(netdata_idx_t)); |
| 402 | |
| 403 | return (errors) ? -1 : 0; |
| 404 | } |
| 405 | |
| 406 | /***************************************************************** |
| 407 | * |
| 408 | * DATA THREAD |
| 409 | * |
| 410 | *****************************************************************/ |
| 411 | |
| 412 | /** |
| 413 | * Read global table |
| 414 | * |
| 415 | * Read the table with number of calls for all functions |
| 416 | * |
| 417 | * @param maps_per_core do I need to read all cores? |
| 418 | */ |
| 419 | static void ebpf_sync_read_global_table(int maps_per_core) |
| 420 | { |
| 421 | netdata_idx_t stored[NETDATA_MAX_PROCESSOR]; |
| 422 | uint32_t idx = NETDATA_SYNC_CALL; |
| 423 | int i; |
| 424 | for (i = 0; i < NETDATA_SYNC_IDX_END; i++) { |
| 425 | ebpf_sync_syscalls_t *w = &local_syscalls[i]; |
| 426 | if (w->enabled) { |
| 427 | int fd = w->sync_maps[NETDATA_SYNC_GLOBAL_TABLE].map_fd; |
| 428 | if (!bpf_map_lookup_elem(fd, &idx, &stored)) { |
| 429 | int j, end = (maps_per_core) ? ebpf_nprocs : 1; |
| 430 | netdata_idx_t total = 0; |
| 431 | for (j = 0; j < end; j++) |
| 432 | total += stored[j]; |
| 433 | |
| 434 | sync_hash_values[i] = total; |
| 435 | } |
| 436 | } |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Create Sync charts |
| 442 | * |
| 443 | * Create charts and dimensions according user input. |
| 444 | * |
| 445 | * @param id chart id |
| 446 | * @param idx the first index with data. |
| 447 | * @param end the last index with data. |
| 448 | */ |
| 449 | static void ebpf_send_sync_chart(char *id, int idx, int end) |
| 450 | { |
| 451 | ebpf_write_begin_chart(NETDATA_EBPF_MEMORY_GROUP, id, ""); |
| 452 | |
| 453 | netdata_publish_syscall_t *move = &sync_counter_publish_aggregated[idx]; |
| 454 | |
| 455 | while (move && idx <= end) { |
| 456 | if (local_syscalls[idx].enabled) |
| 457 | write_chart_dimension(move->name, (long long)sync_hash_values[idx]); |
| 458 | |
| 459 | move = move->next; |
| 460 | idx++; |
| 461 | } |
| 462 | |
| 463 | ebpf_write_end_chart(); |
| 464 | } |
| 465 | |
| 466 | /** |
| 467 | * Send data |
| 468 | * |
| 469 | * Send global charts to Netdata |
| 470 | */ |
| 471 | static void sync_send_data() |
| 472 | { |
| 473 | if (local_syscalls[NETDATA_SYNC_FSYNC_IDX].enabled && local_syscalls[NETDATA_SYNC_FDATASYNC_IDX].enabled) { |
| 474 | ebpf_send_sync_chart(NETDATA_EBPF_FILE_SYNC_CHART, NETDATA_SYNC_FSYNC_IDX, NETDATA_SYNC_FDATASYNC_IDX); |
| 475 | } |
| 476 | |
| 477 | if (local_syscalls[NETDATA_SYNC_MSYNC_IDX].enabled) |
| 478 | ebpf_one_dimension_write_charts( |
| 479 | NETDATA_EBPF_MEMORY_GROUP, |
| 480 | NETDATA_EBPF_MSYNC_CHART, |
| 481 | sync_counter_publish_aggregated[NETDATA_SYNC_MSYNC_IDX].dimension, |
| 482 | sync_hash_values[NETDATA_SYNC_MSYNC_IDX]); |
| 483 | |
| 484 | if (local_syscalls[NETDATA_SYNC_SYNC_IDX].enabled && local_syscalls[NETDATA_SYNC_SYNCFS_IDX].enabled) { |
| 485 | ebpf_send_sync_chart(NETDATA_EBPF_SYNC_CHART, NETDATA_SYNC_SYNC_IDX, NETDATA_SYNC_SYNCFS_IDX); |
| 486 | } |
| 487 | |
| 488 | if (local_syscalls[NETDATA_SYNC_SYNC_FILE_RANGE_IDX].enabled) |
| 489 | ebpf_one_dimension_write_charts( |
| 490 | NETDATA_EBPF_MEMORY_GROUP, |
| 491 | NETDATA_EBPF_FILE_SEGMENT_CHART, |
| 492 | sync_counter_publish_aggregated[NETDATA_SYNC_SYNC_FILE_RANGE_IDX].dimension, |
| 493 | sync_hash_values[NETDATA_SYNC_SYNC_FILE_RANGE_IDX]); |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * Main loop for this collector. |
| 498 | */ |
| 499 | static void sync_collector(ebpf_module_t *em) |
| 500 | { |
| 501 | int update_every = em->update_every; |
| 502 | int counter = update_every - 1; |
| 503 | int maps_per_core = em->maps_per_core; |
| 504 | uint32_t running_time = 0; |
| 505 | uint32_t lifetime = em->lifetime; |
| 506 | heartbeat_t hb; |
| 507 | heartbeat_init(&hb, USEC_PER_SEC); |
| 508 | while (!ebpf_plugin_stop() && running_time < lifetime) { |
| 509 | if (ebpf_plugin_stop()) |
| 510 | break; |
| 511 | |
| 512 | heartbeat_next(&hb); |
| 513 | if (ebpf_plugin_stop()) |
| 514 | break; |
| 515 | |
| 516 | if (++counter != update_every) |
| 517 | continue; |
| 518 | |
| 519 | counter = 0; |
| 520 | ebpf_sync_read_global_table(maps_per_core); |
| 521 | netdata_mutex_lock(&lock); |
| 522 | |
| 523 | sync_send_data(); |
| 524 | |
| 525 | netdata_mutex_unlock(&lock); |
| 526 | |
| 527 | if (ebpf_plugin_stop()) |
| 528 | break; |
| 529 | |
| 530 | netdata_mutex_lock(&ebpf_exit_cleanup); |
| 531 | running_time += update_every; |
| 532 | em->running_time = running_time; |
| 533 | netdata_mutex_unlock(&ebpf_exit_cleanup); |
| 534 | } |
| 535 | } |
| 536 | |
| 537 | /***************************************************************** |
| 538 | * |
| 539 | * MAIN THREAD |
| 540 | * |
| 541 | *****************************************************************/ |
| 542 | |
| 543 | /** |
| 544 | * Create Sync charts |
| 545 | * |
| 546 | * Create charts and dimensions according user input. |
| 547 | * |
| 548 | * @param id chart id |
| 549 | * @param title chart title |
| 550 | * @param order order number of the specified chart |
| 551 | * @param idx the first index with data. |
| 552 | * @param end the last index with data. |
| 553 | * @param update_every value to overwrite the update frequency set by the server. |
| 554 | * @param context the chart context |
| 555 | */ |
| 556 | static void ebpf_create_sync_chart(char *id, char *title, int order, int idx, int end, int update_every, char *context) |
| 557 | { |
| 558 | ebpf_write_chart_cmd( |
| 559 | NETDATA_EBPF_MEMORY_GROUP, |
| 560 | id, |
| 561 | "", |
| 562 | title, |
| 563 | EBPF_COMMON_UNITS_CALLS_PER_SEC, |
| 564 | NETDATA_EBPF_SYNC_SUBMENU, |
| 565 | NETDATA_EBPF_CHART_TYPE_LINE, |
| 566 | context, |
| 567 | order, |
| 568 | update_every, |
| 569 | NETDATA_EBPF_MODULE_NAME_SYNC); |
| 570 | |
| 571 | netdata_publish_syscall_t *move = &sync_counter_publish_aggregated[idx]; |
| 572 | |
| 573 | while (move && idx <= end) { |
| 574 | if (local_syscalls[idx].enabled) |
| 575 | ebpf_write_global_dimension(move->name, move->dimension, move->algorithm); |
| 576 | |
| 577 | move = move->next; |
| 578 | idx++; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | /** |
| 583 | * Create global charts |
| 584 | * |
| 585 | * Call ebpf_create_chart to create the charts for the collector. |
| 586 | * |
| 587 | * @param update_every value to overwrite the update frequency set by the server. |
| 588 | */ |
| 589 | static void ebpf_create_sync_charts(int update_every) |
| 590 | { |
| 591 | if (local_syscalls[NETDATA_SYNC_FSYNC_IDX].enabled && local_syscalls[NETDATA_SYNC_FDATASYNC_IDX].enabled) |
| 592 | ebpf_create_sync_chart( |
| 593 | NETDATA_EBPF_FILE_SYNC_CHART, |
| 594 | "Monitor calls to fsync(2) and fdatasync(2).", |
| 595 | NETDATA_EBPF_FILE_SYNC_CHART_ORDER, |
| 596 | NETDATA_SYNC_FSYNC_IDX, |
| 597 | NETDATA_SYNC_FDATASYNC_IDX, |
| 598 | update_every, |
| 599 | "mem.file_sync"); |
| 600 | |
| 601 | if (local_syscalls[NETDATA_SYNC_MSYNC_IDX].enabled) |
| 602 | ebpf_create_sync_chart( |
| 603 | NETDATA_EBPF_MSYNC_CHART, |
| 604 | "Monitor calls to msync(2).", |
| 605 | NETDATA_EBPF_MSYNC_CHART_ORDER, |
| 606 | NETDATA_SYNC_MSYNC_IDX, |
| 607 | NETDATA_SYNC_MSYNC_IDX, |
| 608 | update_every, |
| 609 | "mem.memory_map"); |
| 610 | |
| 611 | if (local_syscalls[NETDATA_SYNC_SYNC_IDX].enabled && local_syscalls[NETDATA_SYNC_SYNCFS_IDX].enabled) |
| 612 | ebpf_create_sync_chart( |
| 613 | NETDATA_EBPF_SYNC_CHART, |
| 614 | "Monitor calls to sync(2) and syncfs(2).", |
| 615 | NETDATA_EBPF_SYNC_CHART_ORDER, |
| 616 | NETDATA_SYNC_SYNC_IDX, |
| 617 | NETDATA_SYNC_SYNCFS_IDX, |
| 618 | update_every, |
| 619 | "mem.sync"); |
| 620 | |
| 621 | if (local_syscalls[NETDATA_SYNC_SYNC_FILE_RANGE_IDX].enabled) |
| 622 | ebpf_create_sync_chart( |
| 623 | NETDATA_EBPF_FILE_SEGMENT_CHART, |
| 624 | "Monitor calls to sync_file_range(2).", |
| 625 | NETDATA_EBPF_FILE_SEGMENT_CHART_ORDER, |
| 626 | NETDATA_SYNC_SYNC_FILE_RANGE_IDX, |
| 627 | NETDATA_SYNC_SYNC_FILE_RANGE_IDX, |
| 628 | update_every, |
| 629 | "mem.file_segment"); |
| 630 | |
| 631 | fflush(stdout); |
| 632 | } |
| 633 | |
| 634 | /** |
| 635 | * Parse Syscalls |
| 636 | * |
| 637 | * Parse syscall options available inside ebpf.d/sync.conf |
| 638 | */ |
| 639 | static void ebpf_sync_parse_syscalls() |
| 640 | { |
| 641 | for (int i = 0; local_syscalls[i].syscall; i++) { |
| 642 | local_syscalls[i].enabled = |
| 643 | inicfg_get_boolean(&sync_config, NETDATA_SYNC_CONFIG_NAME, local_syscalls[i].syscall, CONFIG_BOOLEAN_YES); |
| 644 | } |
| 645 | } |
| 646 | |
| 647 | /** |
| 648 | * Set sync maps |
| 649 | * |
| 650 | * When thread is initialized the variable sync_maps is set as null, |
| 651 | * this function fills the variable before to use. |
| 652 | */ |
| 653 | static void ebpf_set_sync_maps() |
| 654 | { |
| 655 | ebpf_initialize_sync_maps(); |
| 656 | local_syscalls[NETDATA_SYNC_SYNC_IDX].sync_maps = sync_maps[NETDATA_SYNC_SYNC_IDX]; |
| 657 | local_syscalls[NETDATA_SYNC_SYNCFS_IDX].sync_maps = sync_maps[NETDATA_SYNC_SYNCFS_IDX]; |
| 658 | local_syscalls[NETDATA_SYNC_MSYNC_IDX].sync_maps = sync_maps[NETDATA_SYNC_MSYNC_IDX]; |
| 659 | local_syscalls[NETDATA_SYNC_FSYNC_IDX].sync_maps = sync_maps[NETDATA_SYNC_FSYNC_IDX]; |
| 660 | local_syscalls[NETDATA_SYNC_FDATASYNC_IDX].sync_maps = sync_maps[NETDATA_SYNC_FDATASYNC_IDX]; |
| 661 | local_syscalls[NETDATA_SYNC_SYNC_FILE_RANGE_IDX].sync_maps = sync_maps[NETDATA_SYNC_SYNC_FILE_RANGE_IDX]; |
| 662 | } |
| 663 | |
| 664 | /** |
| 665 | * Sync thread |
| 666 | * |
| 667 | * Thread used to make sync thread |
| 668 | * |
| 669 | * @param ptr a pointer to `struct ebpf_module` |
| 670 | * |
| 671 | * @return It always return NULL |
| 672 | */ |
| 673 | void ebpf_sync_thread(void *ptr) |
| 674 | { |
| 675 | ebpf_module_t *em = (ebpf_module_t *)ptr; |
| 676 | |
| 677 | CLEANUP_FUNCTION_REGISTER(ebpf_sync_exit) cleanup_ptr = em; |
| 678 | |
| 679 | if (!ebpf_module_thread_has_valid_state(em)) { |
| 680 | goto endsync; |
| 681 | } |
| 682 | |
| 683 | ebpf_set_sync_maps(); |
| 684 | ebpf_sync_parse_syscalls(); |
| 685 | |
| 686 | #ifdef LIBBPF_MAJOR_VERSION |
| 687 | ebpf_adjust_thread_load(em, default_btf); |
| 688 | #endif |
| 689 | if (ebpf_sync_initialize_syscall(em)) { |
| 690 | goto endsync; |
| 691 | } |
| 692 | |
| 693 | int algorithms[NETDATA_SYNC_IDX_END] = { |
| 694 | NETDATA_EBPF_INCREMENTAL_IDX, |
| 695 | NETDATA_EBPF_INCREMENTAL_IDX, |
| 696 | NETDATA_EBPF_INCREMENTAL_IDX, |
| 697 | NETDATA_EBPF_INCREMENTAL_IDX, |
| 698 | NETDATA_EBPF_INCREMENTAL_IDX, |
| 699 | NETDATA_EBPF_INCREMENTAL_IDX}; |
| 700 | ebpf_global_labels( |
| 701 | sync_counter_aggregated_data, |
| 702 | sync_counter_publish_aggregated, |
| 703 | sync_counter_dimension_name, |
| 704 | sync_counter_dimension_name, |
| 705 | algorithms, |
| 706 | NETDATA_SYNC_IDX_END); |
| 707 | |
| 708 | netdata_mutex_lock(&lock); |
| 709 | ebpf_create_sync_charts(em->update_every); |
| 710 | ebpf_update_stats(&plugin_statistics, em); |
| 711 | netdata_mutex_unlock(&lock); |
| 712 | |
| 713 | sync_collector(em); |
| 714 | |
| 715 | endsync: |
| 716 | ebpf_update_disabled_plugin_stats(em); |
| 717 | } |