| 1 | /* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only) |
| 2 | * |
| 3 | * counter.c |
| 4 | * |
| 5 | * Copyright (C) 2020 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 6 | */ |
| 7 | |
| 8 | #include <errno.h> |
| 9 | #include "counter.h" |
| 10 | #include "counter-internal.h" |
| 11 | #include <urcu/system.h> |
| 12 | #include <urcu/compiler.h> |
| 13 | #include <stdbool.h> |
| 14 | |
| 15 | #include "common/macros.h" |
| 16 | #include "common/align.h" |
| 17 | #include "common/bitmap.h" |
| 18 | |
| 19 | #include "smp.h" |
| 20 | #include "shm.h" |
| 21 | |
| 22 | static size_t lttng_counter_get_dimension_nr_elements(struct lib_counter_dimension *dimension) |
| 23 | { |
| 24 | return dimension->max_nr_elem; |
| 25 | } |
| 26 | |
| 27 | static int lttng_counter_init_stride( |
| 28 | const struct lib_counter_config *config __attribute__((unused)), |
| 29 | struct lib_counter *counter) |
| 30 | { |
| 31 | size_t nr_dimensions = counter->nr_dimensions; |
| 32 | size_t stride = 1; |
| 33 | ssize_t i; |
| 34 | |
| 35 | for (i = nr_dimensions - 1; i >= 0; i--) { |
| 36 | struct lib_counter_dimension *dimension = &counter->dimensions[i]; |
| 37 | size_t nr_elem; |
| 38 | |
| 39 | nr_elem = lttng_counter_get_dimension_nr_elements(dimension); |
| 40 | dimension->stride = stride; |
| 41 | /* nr_elem should be minimum 1 for each dimension. */ |
| 42 | if (!nr_elem) |
| 43 | return -EINVAL; |
| 44 | stride *= nr_elem; |
| 45 | if (stride > SIZE_MAX / nr_elem) |
| 46 | return -EINVAL; |
| 47 | } |
| 48 | return 0; |
| 49 | } |
| 50 | |
| 51 | static int lttng_counter_layout_init(struct lib_counter *counter, int cpu, int shm_fd) |
| 52 | { |
| 53 | struct lib_counter_layout *layout; |
| 54 | size_t counter_size; |
| 55 | size_t nr_elem = counter->allocated_elem; |
| 56 | size_t shm_length = 0, counters_offset, overflow_offset, underflow_offset; |
| 57 | struct lttng_counter_shm_object *shm_object; |
| 58 | |
| 59 | if (shm_fd < 0) |
| 60 | return 0; /* Skip, will be populated later. */ |
| 61 | |
| 62 | if (cpu == -1) |
| 63 | layout = &counter->global_counters; |
| 64 | else |
| 65 | layout = &counter->percpu_counters[cpu]; |
| 66 | switch (counter->config.counter_size) { |
| 67 | case COUNTER_SIZE_8_BIT: |
| 68 | case COUNTER_SIZE_16_BIT: |
| 69 | case COUNTER_SIZE_32_BIT: |
| 70 | case COUNTER_SIZE_64_BIT: |
| 71 | counter_size = (size_t) counter->config.counter_size; |
| 72 | break; |
| 73 | default: |
| 74 | return -EINVAL; |
| 75 | } |
| 76 | layout->shm_fd = shm_fd; |
| 77 | counters_offset = shm_length; |
| 78 | shm_length += counter_size * nr_elem; |
| 79 | overflow_offset = shm_length; |
| 80 | shm_length += LTTNG_UST_ALIGN(nr_elem, 8) / 8; |
| 81 | underflow_offset = shm_length; |
| 82 | shm_length += LTTNG_UST_ALIGN(nr_elem, 8) / 8; |
| 83 | layout->shm_len = shm_length; |
| 84 | if (counter->is_daemon) { |
| 85 | /* Allocate and clear shared memory. */ |
| 86 | shm_object = lttng_counter_shm_object_table_alloc(counter->object_table, |
| 87 | shm_length, LTTNG_COUNTER_SHM_OBJECT_SHM, shm_fd, cpu); |
| 88 | if (!shm_object) |
| 89 | return -ENOMEM; |
| 90 | } else { |
| 91 | /* Map pre-existing shared memory. */ |
| 92 | shm_object = lttng_counter_shm_object_table_append_shm(counter->object_table, |
| 93 | shm_fd, shm_length); |
| 94 | if (!shm_object) |
| 95 | return -ENOMEM; |
| 96 | } |
| 97 | layout->counters = shm_object->memory_map + counters_offset; |
| 98 | layout->overflow_bitmap = (unsigned long *)(shm_object->memory_map + overflow_offset); |
| 99 | layout->underflow_bitmap = (unsigned long *)(shm_object->memory_map + underflow_offset); |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | int lttng_counter_set_global_shm(struct lib_counter *counter, int fd) |
| 104 | { |
| 105 | struct lib_counter_config *config = &counter->config; |
| 106 | struct lib_counter_layout *layout; |
| 107 | |
| 108 | if (!(config->alloc & COUNTER_ALLOC_GLOBAL)) |
| 109 | return -EINVAL; |
| 110 | layout = &counter->global_counters; |
| 111 | if (layout->shm_fd >= 0) |
| 112 | return -EBUSY; |
| 113 | return lttng_counter_layout_init(counter, -1, fd); |
| 114 | } |
| 115 | |
| 116 | int lttng_counter_set_cpu_shm(struct lib_counter *counter, int cpu, int fd) |
| 117 | { |
| 118 | struct lib_counter_config *config = &counter->config; |
| 119 | struct lib_counter_layout *layout; |
| 120 | |
| 121 | if (cpu < 0 || cpu >= lttng_counter_num_possible_cpus()) |
| 122 | return -EINVAL; |
| 123 | |
| 124 | if (!(config->alloc & COUNTER_ALLOC_PER_CPU)) |
| 125 | return -EINVAL; |
| 126 | layout = &counter->percpu_counters[cpu]; |
| 127 | if (layout->shm_fd >= 0) |
| 128 | return -EBUSY; |
| 129 | return lttng_counter_layout_init(counter, cpu, fd); |
| 130 | } |
| 131 | |
| 132 | static |
| 133 | int lttng_counter_set_global_sum_step(struct lib_counter *counter, |
| 134 | int64_t global_sum_step) |
| 135 | { |
| 136 | if (global_sum_step < 0) |
| 137 | return -EINVAL; |
| 138 | |
| 139 | switch (counter->config.counter_size) { |
| 140 | case COUNTER_SIZE_8_BIT: |
| 141 | if (global_sum_step > INT8_MAX) |
| 142 | return -EINVAL; |
| 143 | counter->global_sum_step.s8 = (int8_t) global_sum_step; |
| 144 | break; |
| 145 | case COUNTER_SIZE_16_BIT: |
| 146 | if (global_sum_step > INT16_MAX) |
| 147 | return -EINVAL; |
| 148 | counter->global_sum_step.s16 = (int16_t) global_sum_step; |
| 149 | break; |
| 150 | case COUNTER_SIZE_32_BIT: |
| 151 | if (global_sum_step > INT32_MAX) |
| 152 | return -EINVAL; |
| 153 | counter->global_sum_step.s32 = (int32_t) global_sum_step; |
| 154 | break; |
| 155 | case COUNTER_SIZE_64_BIT: |
| 156 | counter->global_sum_step.s64 = global_sum_step; |
| 157 | break; |
| 158 | default: |
| 159 | return -EINVAL; |
| 160 | } |
| 161 | |
| 162 | return 0; |
| 163 | } |
| 164 | |
| 165 | static |
| 166 | int validate_args(const struct lib_counter_config *config, |
| 167 | size_t nr_dimensions __attribute__((unused)), |
| 168 | const size_t *max_nr_elem, |
| 169 | int64_t global_sum_step, |
| 170 | int global_counter_fd, |
| 171 | int nr_counter_cpu_fds, |
| 172 | const int *counter_cpu_fds) |
| 173 | { |
| 174 | int nr_cpus = lttng_counter_num_possible_cpus(); |
| 175 | |
| 176 | if (CAA_BITS_PER_LONG != 64 && config->counter_size == COUNTER_SIZE_64_BIT) { |
| 177 | WARN_ON_ONCE(1); |
| 178 | return -1; |
| 179 | } |
| 180 | if (!max_nr_elem) |
| 181 | return -1; |
| 182 | /* |
| 183 | * global sum step is only useful with allocating both per-cpu |
| 184 | * and global counters. |
| 185 | */ |
| 186 | if (global_sum_step && (!(config->alloc & COUNTER_ALLOC_GLOBAL) || |
| 187 | !(config->alloc & COUNTER_ALLOC_PER_CPU))) |
| 188 | return -1; |
| 189 | if (!(config->alloc & COUNTER_ALLOC_GLOBAL) && global_counter_fd >= 0) |
| 190 | return -1; |
| 191 | if (!(config->alloc & COUNTER_ALLOC_PER_CPU) && counter_cpu_fds) |
| 192 | return -1; |
| 193 | if (!(config->alloc & COUNTER_ALLOC_PER_CPU) && nr_counter_cpu_fds >= 0) |
| 194 | return -1; |
| 195 | if (counter_cpu_fds && nr_cpus != nr_counter_cpu_fds) |
| 196 | return -1; |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | struct lib_counter *lttng_counter_create(const struct lib_counter_config *config, |
| 201 | size_t nr_dimensions, |
| 202 | const size_t *max_nr_elem, |
| 203 | int64_t global_sum_step, |
| 204 | int global_counter_fd, |
| 205 | int nr_counter_cpu_fds, |
| 206 | const int *counter_cpu_fds, |
| 207 | bool is_daemon) |
| 208 | { |
| 209 | struct lib_counter *counter; |
| 210 | size_t dimension, nr_elem = 1; |
| 211 | int cpu, ret; |
| 212 | int nr_handles = 0; |
| 213 | int nr_cpus = lttng_counter_num_possible_cpus(); |
| 214 | |
| 215 | if (validate_args(config, nr_dimensions, max_nr_elem, |
| 216 | global_sum_step, global_counter_fd, nr_counter_cpu_fds, |
| 217 | counter_cpu_fds)) |
| 218 | return NULL; |
| 219 | counter = zmalloc(sizeof(struct lib_counter)); |
| 220 | if (!counter) |
| 221 | return NULL; |
| 222 | counter->global_counters.shm_fd = -1; |
| 223 | counter->config = *config; |
| 224 | counter->is_daemon = is_daemon; |
| 225 | if (lttng_counter_set_global_sum_step(counter, global_sum_step)) |
| 226 | goto error_sum_step; |
| 227 | counter->nr_dimensions = nr_dimensions; |
| 228 | counter->dimensions = zmalloc(nr_dimensions * sizeof(*counter->dimensions)); |
| 229 | if (!counter->dimensions) |
| 230 | goto error_dimensions; |
| 231 | for (dimension = 0; dimension < nr_dimensions; dimension++) |
| 232 | counter->dimensions[dimension].max_nr_elem = max_nr_elem[dimension]; |
| 233 | if (config->alloc & COUNTER_ALLOC_PER_CPU) { |
| 234 | counter->percpu_counters = zmalloc(sizeof(struct lib_counter_layout) * nr_cpus); |
| 235 | if (!counter->percpu_counters) |
| 236 | goto error_alloc_percpu; |
| 237 | lttng_counter_for_each_possible_cpu(cpu) |
| 238 | counter->percpu_counters[cpu].shm_fd = -1; |
| 239 | } |
| 240 | |
| 241 | if (lttng_counter_init_stride(config, counter)) |
| 242 | goto error_init_stride; |
| 243 | //TODO saturation values. |
| 244 | for (dimension = 0; dimension < counter->nr_dimensions; dimension++) |
| 245 | nr_elem *= lttng_counter_get_dimension_nr_elements(&counter->dimensions[dimension]); |
| 246 | counter->allocated_elem = nr_elem; |
| 247 | |
| 248 | if (config->alloc & COUNTER_ALLOC_GLOBAL) |
| 249 | nr_handles++; |
| 250 | if (config->alloc & COUNTER_ALLOC_PER_CPU) |
| 251 | nr_handles += nr_cpus; |
| 252 | /* Allocate table for global and per-cpu counters. */ |
| 253 | counter->object_table = lttng_counter_shm_object_table_create(nr_handles); |
| 254 | if (!counter->object_table) |
| 255 | goto error_alloc_object_table; |
| 256 | |
| 257 | if (config->alloc & COUNTER_ALLOC_GLOBAL) { |
| 258 | ret = lttng_counter_layout_init(counter, -1, global_counter_fd); /* global */ |
| 259 | if (ret) |
| 260 | goto layout_init_error; |
| 261 | } |
| 262 | if ((config->alloc & COUNTER_ALLOC_PER_CPU) && counter_cpu_fds) { |
| 263 | lttng_counter_for_each_possible_cpu(cpu) { |
| 264 | ret = lttng_counter_layout_init(counter, cpu, counter_cpu_fds[cpu]); |
| 265 | if (ret) |
| 266 | goto layout_init_error; |
| 267 | } |
| 268 | } |
| 269 | return counter; |
| 270 | |
| 271 | layout_init_error: |
| 272 | lttng_counter_shm_object_table_destroy(counter->object_table, is_daemon); |
| 273 | error_alloc_object_table: |
| 274 | error_init_stride: |
| 275 | free(counter->percpu_counters); |
| 276 | error_alloc_percpu: |
| 277 | free(counter->dimensions); |
| 278 | error_dimensions: |
| 279 | error_sum_step: |
| 280 | free(counter); |
| 281 | return NULL; |
| 282 | } |
| 283 | |
| 284 | void lttng_counter_destroy(struct lib_counter *counter) |
| 285 | { |
| 286 | struct lib_counter_config *config = &counter->config; |
| 287 | |
| 288 | if (config->alloc & COUNTER_ALLOC_PER_CPU) |
| 289 | free(counter->percpu_counters); |
| 290 | lttng_counter_shm_object_table_destroy(counter->object_table, counter->is_daemon); |
| 291 | free(counter->dimensions); |
| 292 | free(counter); |
| 293 | } |
| 294 | |
| 295 | int lttng_counter_get_global_shm(struct lib_counter *counter, int *fd, size_t *len) |
| 296 | { |
| 297 | int shm_fd; |
| 298 | |
| 299 | shm_fd = counter->global_counters.shm_fd; |
| 300 | if (shm_fd < 0) |
| 301 | return -1; |
| 302 | *fd = shm_fd; |
| 303 | *len = counter->global_counters.shm_len; |
| 304 | return 0; |
| 305 | } |
| 306 | |
| 307 | int lttng_counter_get_cpu_shm(struct lib_counter *counter, int cpu, int *fd, size_t *len) |
| 308 | { |
| 309 | struct lib_counter_layout *layout; |
| 310 | int shm_fd; |
| 311 | |
| 312 | if (cpu >= lttng_counter_num_possible_cpus()) |
| 313 | return -1; |
| 314 | layout = &counter->percpu_counters[cpu]; |
| 315 | shm_fd = layout->shm_fd; |
| 316 | if (shm_fd < 0) |
| 317 | return -1; |
| 318 | *fd = shm_fd; |
| 319 | *len = layout->shm_len; |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | int lttng_counter_read(const struct lib_counter_config *config, |
| 324 | struct lib_counter *counter, |
| 325 | const size_t *dimension_indexes, |
| 326 | int cpu, int64_t *value, bool *overflow, |
| 327 | bool *underflow) |
| 328 | { |
| 329 | size_t index; |
| 330 | struct lib_counter_layout *layout; |
| 331 | |
| 332 | if (caa_unlikely(lttng_counter_validate_indexes(config, counter, dimension_indexes))) |
| 333 | return -EOVERFLOW; |
| 334 | index = lttng_counter_get_index(config, counter, dimension_indexes); |
| 335 | |
| 336 | switch (config->alloc) { |
| 337 | case COUNTER_ALLOC_PER_CPU: |
| 338 | if (cpu < 0 || cpu >= lttng_counter_num_possible_cpus()) |
| 339 | return -EINVAL; |
| 340 | layout = &counter->percpu_counters[cpu]; |
| 341 | break; |
| 342 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: |
| 343 | if (cpu >= 0) { |
| 344 | if (cpu >= lttng_counter_num_possible_cpus()) |
| 345 | return -EINVAL; |
| 346 | layout = &counter->percpu_counters[cpu]; |
| 347 | } else { |
| 348 | layout = &counter->global_counters; |
| 349 | } |
| 350 | break; |
| 351 | case COUNTER_ALLOC_GLOBAL: |
| 352 | if (cpu >= 0) |
| 353 | return -EINVAL; |
| 354 | layout = &counter->global_counters; |
| 355 | break; |
| 356 | default: |
| 357 | return -EINVAL; |
| 358 | } |
| 359 | if (caa_unlikely(!layout->counters)) |
| 360 | return -ENODEV; |
| 361 | |
| 362 | switch (config->counter_size) { |
| 363 | case COUNTER_SIZE_8_BIT: |
| 364 | { |
| 365 | int8_t *int_p = (int8_t *) layout->counters + index; |
| 366 | *value = (int64_t) CMM_LOAD_SHARED(*int_p); |
| 367 | break; |
| 368 | } |
| 369 | case COUNTER_SIZE_16_BIT: |
| 370 | { |
| 371 | int16_t *int_p = (int16_t *) layout->counters + index; |
| 372 | *value = (int64_t) CMM_LOAD_SHARED(*int_p); |
| 373 | break; |
| 374 | } |
| 375 | case COUNTER_SIZE_32_BIT: |
| 376 | { |
| 377 | int32_t *int_p = (int32_t *) layout->counters + index; |
| 378 | *value = (int64_t) CMM_LOAD_SHARED(*int_p); |
| 379 | break; |
| 380 | } |
| 381 | #if CAA_BITS_PER_LONG == 64 |
| 382 | case COUNTER_SIZE_64_BIT: |
| 383 | { |
| 384 | int64_t *int_p = (int64_t *) layout->counters + index; |
| 385 | *value = CMM_LOAD_SHARED(*int_p); |
| 386 | break; |
| 387 | } |
| 388 | #endif |
| 389 | default: |
| 390 | return -EINVAL; |
| 391 | } |
| 392 | *overflow = lttng_bitmap_test_bit(index, layout->overflow_bitmap); |
| 393 | *underflow = lttng_bitmap_test_bit(index, layout->underflow_bitmap); |
| 394 | return 0; |
| 395 | } |
| 396 | |
| 397 | int lttng_counter_aggregate(const struct lib_counter_config *config, |
| 398 | struct lib_counter *counter, |
| 399 | const size_t *dimension_indexes, |
| 400 | int64_t *value, bool *overflow, |
| 401 | bool *underflow) |
| 402 | { |
| 403 | int cpu, ret; |
| 404 | int64_t v, sum = 0; |
| 405 | bool of, uf; |
| 406 | |
| 407 | *overflow = false; |
| 408 | *underflow = false; |
| 409 | |
| 410 | switch (config->alloc) { |
| 411 | case COUNTER_ALLOC_GLOBAL: /* Fallthrough */ |
| 412 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: |
| 413 | /* Read global counter. */ |
| 414 | ret = lttng_counter_read(config, counter, dimension_indexes, |
| 415 | -1, &v, &of, &uf); |
| 416 | if (ret < 0) |
| 417 | return ret; |
| 418 | sum += v; |
| 419 | *overflow |= of; |
| 420 | *underflow |= uf; |
| 421 | break; |
| 422 | case COUNTER_ALLOC_PER_CPU: |
| 423 | break; |
| 424 | default: |
| 425 | return -EINVAL; |
| 426 | } |
| 427 | |
| 428 | switch (config->alloc) { |
| 429 | case COUNTER_ALLOC_GLOBAL: |
| 430 | break; |
| 431 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: /* Fallthrough */ |
| 432 | case COUNTER_ALLOC_PER_CPU: |
| 433 | lttng_counter_for_each_possible_cpu(cpu) { |
| 434 | int64_t old = sum; |
| 435 | |
| 436 | ret = lttng_counter_read(config, counter, dimension_indexes, |
| 437 | cpu, &v, &of, &uf); |
| 438 | if (ret < 0) |
| 439 | return ret; |
| 440 | *overflow |= of; |
| 441 | *underflow |= uf; |
| 442 | /* Overflow is defined on unsigned types. */ |
| 443 | sum = (int64_t) ((uint64_t) old + (uint64_t) v); |
| 444 | if (v > 0 && sum < old) |
| 445 | *overflow = true; |
| 446 | else if (v < 0 && sum > old) |
| 447 | *underflow = true; |
| 448 | } |
| 449 | break; |
| 450 | default: |
| 451 | return -EINVAL; |
| 452 | } |
| 453 | *value = sum; |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | static |
| 458 | int lttng_counter_clear_cpu(const struct lib_counter_config *config, |
| 459 | struct lib_counter *counter, |
| 460 | const size_t *dimension_indexes, |
| 461 | int cpu) |
| 462 | { |
| 463 | size_t index; |
| 464 | struct lib_counter_layout *layout; |
| 465 | |
| 466 | if (caa_unlikely(lttng_counter_validate_indexes(config, counter, dimension_indexes))) |
| 467 | return -EOVERFLOW; |
| 468 | index = lttng_counter_get_index(config, counter, dimension_indexes); |
| 469 | |
| 470 | switch (config->alloc) { |
| 471 | case COUNTER_ALLOC_PER_CPU: |
| 472 | if (cpu < 0 || cpu >= lttng_counter_num_possible_cpus()) |
| 473 | return -EINVAL; |
| 474 | layout = &counter->percpu_counters[cpu]; |
| 475 | break; |
| 476 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: |
| 477 | if (cpu >= 0) { |
| 478 | if (cpu >= lttng_counter_num_possible_cpus()) |
| 479 | return -EINVAL; |
| 480 | layout = &counter->percpu_counters[cpu]; |
| 481 | } else { |
| 482 | layout = &counter->global_counters; |
| 483 | } |
| 484 | break; |
| 485 | case COUNTER_ALLOC_GLOBAL: |
| 486 | if (cpu >= 0) |
| 487 | return -EINVAL; |
| 488 | layout = &counter->global_counters; |
| 489 | break; |
| 490 | default: |
| 491 | return -EINVAL; |
| 492 | } |
| 493 | if (caa_unlikely(!layout->counters)) |
| 494 | return -ENODEV; |
| 495 | |
| 496 | switch (config->counter_size) { |
| 497 | case COUNTER_SIZE_8_BIT: |
| 498 | { |
| 499 | int8_t *int_p = (int8_t *) layout->counters + index; |
| 500 | CMM_STORE_SHARED(*int_p, 0); |
| 501 | break; |
| 502 | } |
| 503 | case COUNTER_SIZE_16_BIT: |
| 504 | { |
| 505 | int16_t *int_p = (int16_t *) layout->counters + index; |
| 506 | CMM_STORE_SHARED(*int_p, 0); |
| 507 | break; |
| 508 | } |
| 509 | case COUNTER_SIZE_32_BIT: |
| 510 | { |
| 511 | int32_t *int_p = (int32_t *) layout->counters + index; |
| 512 | CMM_STORE_SHARED(*int_p, 0); |
| 513 | break; |
| 514 | } |
| 515 | #if CAA_BITS_PER_LONG == 64 |
| 516 | case COUNTER_SIZE_64_BIT: |
| 517 | { |
| 518 | int64_t *int_p = (int64_t *) layout->counters + index; |
| 519 | CMM_STORE_SHARED(*int_p, 0); |
| 520 | break; |
| 521 | } |
| 522 | #endif |
| 523 | default: |
| 524 | return -EINVAL; |
| 525 | } |
| 526 | lttng_bitmap_clear_bit(index, layout->overflow_bitmap); |
| 527 | lttng_bitmap_clear_bit(index, layout->underflow_bitmap); |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | int lttng_counter_clear(const struct lib_counter_config *config, |
| 532 | struct lib_counter *counter, |
| 533 | const size_t *dimension_indexes) |
| 534 | { |
| 535 | int cpu, ret; |
| 536 | |
| 537 | switch (config->alloc) { |
| 538 | case COUNTER_ALLOC_PER_CPU: |
| 539 | break; |
| 540 | case COUNTER_ALLOC_GLOBAL: /* Fallthrough */ |
| 541 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: |
| 542 | /* Clear global counter. */ |
| 543 | ret = lttng_counter_clear_cpu(config, counter, dimension_indexes, -1); |
| 544 | if (ret < 0) |
| 545 | return ret; |
| 546 | break; |
| 547 | default: |
| 548 | return -EINVAL; |
| 549 | } |
| 550 | |
| 551 | switch (config->alloc) { |
| 552 | case COUNTER_ALLOC_PER_CPU: /* Fallthrough */ |
| 553 | case COUNTER_ALLOC_PER_CPU | COUNTER_ALLOC_GLOBAL: |
| 554 | lttng_counter_for_each_possible_cpu(cpu) { |
| 555 | ret = lttng_counter_clear_cpu(config, counter, dimension_indexes, cpu); |
| 556 | if (ret < 0) |
| 557 | return ret; |
| 558 | } |
| 559 | break; |
| 560 | case COUNTER_ALLOC_GLOBAL: |
| 561 | break; |
| 562 | default: |
| 563 | return -EINVAL; |
| 564 | } |
| 565 | return 0; |
| 566 | } |