tools/perf/util/cpumap.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <api/fs/fs.h>
   3 #include "cpumap.h"
   4 #include "debug.h"
   5 #include "event.h"
   6 #include <assert.h>
   7 #include <dirent.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <linux/bitmap.h>
  11 #include "asm/bug.h"
  12
  13 #include <linux/ctype.h>
  14 #include <linux/zalloc.h>
  15 #include <internal/cpumap.h>
  16
  17 static struct perf_cpu max_cpu_num;
  18 static struct perf_cpu max_present_cpu_num;
  19 static int max_node_num;
  20 /**
  21  * The numa node X as read from /sys/devices/system/node/nodeX indexed by the
  22  * CPU number.
  23  */
  24 static int *cpunode_map;
  25
  26 bool perf_record_cpu_map_data__test_bit(int i,
  27                                         const struct perf_record_cpu_map_data *data)
  28 {
  29         int bit_word32 = i / 32;
  30         __u32 bit_mask32 = 1U << (i & 31);
  31         int bit_word64 = i / 64;
  32         __u64 bit_mask64 = ((__u64)1) << (i & 63);
  33
  34         return (data->mask32_data.long_size == 4)
  35                 ? (bit_word32 < data->mask32_data.nr) &&
  36                 (data->mask32_data.mask[bit_word32] & bit_mask32) != 0
  37                 : (bit_word64 < data->mask64_data.nr) &&
  38                 (data->mask64_data.mask[bit_word64] & bit_mask64) != 0;
  39 }
  40
  41 /* Read ith mask value from data into the given 64-bit sized bitmap */
  42 static void perf_record_cpu_map_data__read_one_mask(const struct perf_record_cpu_map_data *data,
  43                                                     int i, unsigned long *bitmap)
  44 {
  45 #if __SIZEOF_LONG__ == 8
  46         if (data->mask32_data.long_size == 4)
  47                 bitmap[0] = data->mask32_data.mask[i];
  48         else
  49                 bitmap[0] = data->mask64_data.mask[i];
  50 #else
  51         if (data->mask32_data.long_size == 4) {
  52                 bitmap[0] = data->mask32_data.mask[i];
  53                 bitmap[1] = 0;
  54         } else {
  55 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
  56                 bitmap[0] = (unsigned long)(data->mask64_data.mask[i] >> 32);
  57                 bitmap[1] = (unsigned long)data->mask64_data.mask[i];
  58 #else
  59                 bitmap[0] = (unsigned long)data->mask64_data.mask[i];
  60                 bitmap[1] = (unsigned long)(data->mask64_data.mask[i] >> 32);
  61 #endif
  62         }
  63 #endif
  64 }
  65 static struct perf_cpu_map *cpu_map__from_entries(const struct perf_record_cpu_map_data *data)
  66 {
  67         struct perf_cpu_map *map;
  68
  69         map = perf_cpu_map__empty_new(data->cpus_data.nr);
  70         if (map) {
  71                 unsigned i;
  72
  73                 for (i = 0; i < data->cpus_data.nr; i++) {
  74                         /*
  75                          * Special treatment for -1, which is not real cpu number,
  76                          * and we need to use (int) -1 to initialize map[i],
  77                          * otherwise it would become 65535.
  78                          */
  79                         if (data->cpus_data.cpu[i] == (u16) -1)
  80                                 RC_CHK_ACCESS(map)->map[i].cpu = -1;
  81                         else
  82                                 RC_CHK_ACCESS(map)->map[i].cpu = (int) data->cpus_data.cpu[i];
  83                 }
  84         }
  85
  86         return map;
  87 }
  88
  89 static struct perf_cpu_map *cpu_map__from_mask(const struct perf_record_cpu_map_data *data)
  90 {
  91         DECLARE_BITMAP(local_copy, 64);
  92         int weight = 0, mask_nr = data->mask32_data.nr;
  93         struct perf_cpu_map *map;
  94
  95         for (int i = 0; i < mask_nr; i++) {
  96                 perf_record_cpu_map_data__read_one_mask(data, i, local_copy);
  97                 weight += bitmap_weight(local_copy, 64);
  98         }
  99
 100         map = perf_cpu_map__empty_new(weight);
 101         if (!map)
 102                 return NULL;
 103
 104         for (int i = 0, j = 0; i < mask_nr; i++) {
 105                 int cpus_per_i = (i * data->mask32_data.long_size  * BITS_PER_BYTE);
 106                 int cpu;
 107
 108                 perf_record_cpu_map_data__read_one_mask(data, i, local_copy);
 109                 for_each_set_bit(cpu, local_copy, 64)
 110                         RC_CHK_ACCESS(map)->map[j++].cpu = cpu + cpus_per_i;
 111         }
 112         return map;
 113
 114 }
 115
 116 static struct perf_cpu_map *cpu_map__from_range(const struct perf_record_cpu_map_data *data)
 117 {
 118         struct perf_cpu_map *map;
 119         unsigned int i = 0;
 120
 121         map = perf_cpu_map__empty_new(data->range_cpu_data.end_cpu -
 122                                 data->range_cpu_data.start_cpu + 1 + data->range_cpu_data.any_cpu);
 123         if (!map)
 124                 return NULL;
 125
 126         if (data->range_cpu_data.any_cpu)
 127                 RC_CHK_ACCESS(map)->map[i++].cpu = -1;
 128
 129         for (int cpu = data->range_cpu_data.start_cpu; cpu <= data->range_cpu_data.end_cpu;
 130              i++, cpu++)
 131                 RC_CHK_ACCESS(map)->map[i].cpu = cpu;
 132
 133         return map;
 134 }
 135
 136 struct perf_cpu_map *cpu_map__new_data(const struct perf_record_cpu_map_data *data)
 137 {
 138         switch (data->type) {
 139         case PERF_CPU_MAP__CPUS:
 140                 return cpu_map__from_entries(data);
 141         case PERF_CPU_MAP__MASK:
 142                 return cpu_map__from_mask(data);
 143         case PERF_CPU_MAP__RANGE_CPUS:
 144                 return cpu_map__from_range(data);
 145         default:
 146                 pr_err("cpu_map__new_data unknown type %d\n", data->type);
 147                 return NULL;
 148         }
 149 }
 150
 151 size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp)
 152 {
 153 #define BUFSIZE 1024
 154         char buf[BUFSIZE];
 155
 156         cpu_map__snprint(map, buf, sizeof(buf));
 157         return fprintf(fp, "%s\n", buf);
 158 #undef BUFSIZE
 159 }
 160
 161 struct perf_cpu_map *perf_cpu_map__empty_new(int nr)
 162 {
 163         struct perf_cpu_map *cpus = perf_cpu_map__alloc(nr);
 164
 165         if (cpus != NULL) {
 166                 for (int i = 0; i < nr; i++)
 167                         RC_CHK_ACCESS(cpus)->map[i].cpu = -1;
 168         }
 169
 170         return cpus;
 171 }
 172
 173 struct cpu_aggr_map *cpu_aggr_map__empty_new(int nr)
 174 {
 175         struct cpu_aggr_map *cpus = malloc(sizeof(*cpus) + sizeof(struct aggr_cpu_id) * nr);
 176
 177         if (cpus != NULL) {
 178                 int i;
 179
 180                 cpus->nr = nr;
 181                 for (i = 0; i < nr; i++)
 182                         cpus->map[i] = aggr_cpu_id__empty();
 183         }
 184
 185         return cpus;
 186 }
 187
 188 static int cpu__get_topology_int(int cpu, const char *name, int *value)
 189 {
 190         char path[PATH_MAX];
 191
 192         snprintf(path, PATH_MAX,
 193                 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
 194
 195         return sysfs__read_int(path, value);
 196 }
 197
 198 int cpu__get_socket_id(struct perf_cpu cpu)
 199 {
 200         int value, ret = cpu__get_topology_int(cpu.cpu, "physical_package_id", &value);
 201         return ret ?: value;
 202 }
 203
 204 struct aggr_cpu_id aggr_cpu_id__socket(struct perf_cpu cpu, void *data __maybe_unused)
 205 {
 206         struct aggr_cpu_id id = aggr_cpu_id__empty();
 207
 208         id.socket = cpu__get_socket_id(cpu);
 209         return id;
 210 }
 211
 212 static int aggr_cpu_id__cmp(const void *a_pointer, const void *b_pointer)
 213 {
 214         struct aggr_cpu_id *a = (struct aggr_cpu_id *)a_pointer;
 215         struct aggr_cpu_id *b = (struct aggr_cpu_id *)b_pointer;
 216
 217         if (a->node != b->node)
 218                 return a->node - b->node;
 219         else if (a->socket != b->socket)
 220                 return a->socket - b->socket;
 221         else if (a->die != b->die)
 222                 return a->die - b->die;
 223         else if (a->cluster != b->cluster)
 224                 return a->cluster - b->cluster;
 225         else if (a->cache_lvl != b->cache_lvl)
 226                 return a->cache_lvl - b->cache_lvl;
 227         else if (a->cache != b->cache)
 228                 return a->cache - b->cache;
 229         else if (a->core != b->core)
 230                 return a->core - b->core;
 231         else
 232                 return a->thread_idx - b->thread_idx;
 233 }
 234
 235 struct cpu_aggr_map *cpu_aggr_map__new(const struct perf_cpu_map *cpus,
 236                                        aggr_cpu_id_get_t get_id,
 237                                        void *data, bool needs_sort)
 238 {
 239         int idx;
 240         struct perf_cpu cpu;
 241         struct cpu_aggr_map *c = cpu_aggr_map__empty_new(perf_cpu_map__nr(cpus));
 242
 243         if (!c)
 244                 return NULL;
 245
 246         /* Reset size as it may only be partially filled */
 247         c->nr = 0;
 248
 249         perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
 250                 bool duplicate = false;
 251                 struct aggr_cpu_id cpu_id = get_id(cpu, data);
 252
 253                 for (int j = 0; j < c->nr; j++) {
 254                         if (aggr_cpu_id__equal(&cpu_id, &c->map[j])) {
 255                                 duplicate = true;
 256                                 break;
 257                         }
 258                 }
 259                 if (!duplicate) {
 260                         c->map[c->nr] = cpu_id;
 261                         c->nr++;
 262                 }
 263         }
 264         /* Trim. */
 265         if (c->nr != perf_cpu_map__nr(cpus)) {
 266                 struct cpu_aggr_map *trimmed_c =
 267                         realloc(c,
 268                                 sizeof(struct cpu_aggr_map) + sizeof(struct aggr_cpu_id) * c->nr);
 269
 270                 if (trimmed_c)
 271                         c = trimmed_c;
 272         }
 273
 274         /* ensure we process id in increasing order */
 275         if (needs_sort)
 276                 qsort(c->map, c->nr, sizeof(struct aggr_cpu_id), aggr_cpu_id__cmp);
 277
 278         return c;
 279
 280 }
 281
 282 int cpu__get_die_id(struct perf_cpu cpu)
 283 {
 284         int value, ret = cpu__get_topology_int(cpu.cpu, "die_id", &value);
 285
 286         return ret ?: value;
 287 }
 288
 289 struct aggr_cpu_id aggr_cpu_id__die(struct perf_cpu cpu, void *data)
 290 {
 291         struct aggr_cpu_id id;
 292         int die;
 293
 294         die = cpu__get_die_id(cpu);
 295         /* There is no die_id on legacy system. */
 296         if (die == -1)
 297                 die = 0;
 298
 299         /*
 300          * die_id is relative to socket, so start
 301          * with the socket ID and then add die to
 302          * make a unique ID.
 303          */
 304         id = aggr_cpu_id__socket(cpu, data);
 305         if (aggr_cpu_id__is_empty(&id))
 306                 return id;
 307
 308         id.die = die;
 309         return id;
 310 }
 311
 312 int cpu__get_cluster_id(struct perf_cpu cpu)
 313 {
 314         int value, ret = cpu__get_topology_int(cpu.cpu, "cluster_id", &value);
 315
 316         return ret ?: value;
 317 }
 318
 319 struct aggr_cpu_id aggr_cpu_id__cluster(struct perf_cpu cpu, void *data)
 320 {
 321         int cluster = cpu__get_cluster_id(cpu);
 322         struct aggr_cpu_id id;
 323
 324         /* There is no cluster_id on legacy system. */
 325         if (cluster == -1)
 326                 cluster = 0;
 327
 328         id = aggr_cpu_id__die(cpu, data);
 329         if (aggr_cpu_id__is_empty(&id))
 330                 return id;
 331
 332         id.cluster = cluster;
 333         return id;
 334 }
 335
 336 int cpu__get_core_id(struct perf_cpu cpu)
 337 {
 338         int value, ret = cpu__get_topology_int(cpu.cpu, "core_id", &value);
 339         return ret ?: value;
 340 }
 341
 342 struct aggr_cpu_id aggr_cpu_id__core(struct perf_cpu cpu, void *data)
 343 {
 344         struct aggr_cpu_id id;
 345         int core = cpu__get_core_id(cpu);
 346
 347         /* aggr_cpu_id__die returns a struct with socket die, and cluster set. */
 348         id = aggr_cpu_id__cluster(cpu, data);
 349         if (aggr_cpu_id__is_empty(&id))
 350                 return id;
 351
 352         /*
 353          * core_id is relative to socket and die, we need a global id.
 354          * So we combine the result from cpu_map__get_die with the core id
 355          */
 356         id.core = core;
 357         return id;
 358
 359 }
 360
 361 struct aggr_cpu_id aggr_cpu_id__cpu(struct perf_cpu cpu, void *data)
 362 {
 363         struct aggr_cpu_id id;
 364
 365         /* aggr_cpu_id__core returns a struct with socket, die and core set. */
 366         id = aggr_cpu_id__core(cpu, data);
 367         if (aggr_cpu_id__is_empty(&id))
 368                 return id;
 369
 370         id.cpu = cpu;
 371         return id;
 372
 373 }
 374
 375 struct aggr_cpu_id aggr_cpu_id__node(struct perf_cpu cpu, void *data __maybe_unused)
 376 {
 377         struct aggr_cpu_id id = aggr_cpu_id__empty();
 378
 379         id.node = cpu__get_node(cpu);
 380         return id;
 381 }
 382
 383 struct aggr_cpu_id aggr_cpu_id__global(struct perf_cpu cpu, void *data __maybe_unused)
 384 {
 385         struct aggr_cpu_id id = aggr_cpu_id__empty();
 386
 387         /* it always aggregates to the cpu 0 */
 388         cpu.cpu = 0;
 389         id.cpu = cpu;
 390         return id;
 391 }
 392
 393 /* setup simple routines to easily access node numbers given a cpu number */
 394 static int get_max_num(char *path, int *max)
 395 {
 396         size_t num;
 397         char *buf;
 398         int err = 0;
 399
 400         if (filename__read_str(path, &buf, &num))
 401                 return -1;
 402
 403         buf[num] = '\0';
 404
 405         /* start on the right, to find highest node num */
 406         while (--num) {
 407                 if ((buf[num] == ',') || (buf[num] == '-')) {
 408                         num++;
 409                         break;
 410                 }
 411         }
 412         if (sscanf(&buf[num], "%d", max) < 1) {
 413                 err = -1;
 414                 goto out;
 415         }
 416
 417         /* convert from 0-based to 1-based */
 418         (*max)++;
 419
 420 out:
 421         free(buf);
 422         return err;
 423 }
 424
 425 /* Determine highest possible cpu in the system for sparse allocation */
 426 static void set_max_cpu_num(void)
 427 {
 428         const char *mnt;
 429         char path[PATH_MAX];
 430         int ret = -1;
 431
 432         /* set up default */
 433         max_cpu_num.cpu = 4096;
 434         max_present_cpu_num.cpu = 4096;
 435
 436         mnt = sysfs__mountpoint();
 437         if (!mnt)
 438                 goto out;
 439
 440         /* get the highest possible cpu number for a sparse allocation */
 441         ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
 442         if (ret >= PATH_MAX) {
 443                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 444                 goto out;
 445         }
 446
 447         ret = get_max_num(path, &max_cpu_num.cpu);
 448         if (ret)
 449                 goto out;
 450
 451         /* get the highest present cpu number for a sparse allocation */
 452         ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
 453         if (ret >= PATH_MAX) {
 454                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 455                 goto out;
 456         }
 457
 458         ret = get_max_num(path, &max_present_cpu_num.cpu);
 459
 460 out:
 461         if (ret)
 462                 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num.cpu);
 463 }
 464
 465 /* Determine highest possible node in the system for sparse allocation */
 466 static void set_max_node_num(void)
 467 {
 468         const char *mnt;
 469         char path[PATH_MAX];
 470         int ret = -1;
 471
 472         /* set up default */
 473         max_node_num = 8;
 474
 475         mnt = sysfs__mountpoint();
 476         if (!mnt)
 477                 goto out;
 478
 479         /* get the highest possible cpu number for a sparse allocation */
 480         ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
 481         if (ret >= PATH_MAX) {
 482                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 483                 goto out;
 484         }
 485
 486         ret = get_max_num(path, &max_node_num);
 487
 488 out:
 489         if (ret)
 490                 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
 491 }
 492
 493 int cpu__max_node(void)
 494 {
 495         if (unlikely(!max_node_num))
 496                 set_max_node_num();
 497
 498         return max_node_num;
 499 }
 500
 501 struct perf_cpu cpu__max_cpu(void)
 502 {
 503         if (unlikely(!max_cpu_num.cpu))
 504                 set_max_cpu_num();
 505
 506         return max_cpu_num;
 507 }
 508
 509 struct perf_cpu cpu__max_present_cpu(void)
 510 {
 511         if (unlikely(!max_present_cpu_num.cpu))
 512                 set_max_cpu_num();
 513
 514         return max_present_cpu_num;
 515 }
 516
 517
 518 int cpu__get_node(struct perf_cpu cpu)
 519 {
 520         if (unlikely(cpunode_map == NULL)) {
 521                 pr_debug("cpu_map not initialized\n");
 522                 return -1;
 523         }
 524
 525         return cpunode_map[cpu.cpu];
 526 }
 527
 528 static int init_cpunode_map(void)
 529 {
 530         int i;
 531
 532         set_max_cpu_num();
 533         set_max_node_num();
 534
 535         cpunode_map = calloc(max_cpu_num.cpu, sizeof(int));
 536         if (!cpunode_map) {
 537                 pr_err("%s: calloc failed\n", __func__);
 538                 return -1;
 539         }
 540
 541         for (i = 0; i < max_cpu_num.cpu; i++)
 542                 cpunode_map[i] = -1;
 543
 544         return 0;
 545 }
 546
 547 int cpu__setup_cpunode_map(void)
 548 {
 549         struct dirent *dent1, *dent2;
 550         DIR *dir1, *dir2;
 551         unsigned int cpu, mem;
 552         char buf[PATH_MAX];
 553         char path[PATH_MAX];
 554         const char *mnt;
 555         int n;
 556
 557         /* initialize globals */
 558         if (init_cpunode_map())
 559                 return -1;
 560
 561         mnt = sysfs__mountpoint();
 562         if (!mnt)
 563                 return 0;
 564
 565         n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
 566         if (n >= PATH_MAX) {
 567                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 568                 return -1;
 569         }
 570
 571         dir1 = opendir(path);
 572         if (!dir1)
 573                 return 0;
 574
 575         /* walk tree and setup map */
 576         while ((dent1 = readdir(dir1)) != NULL) {
 577                 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
 578                         continue;
 579
 580                 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
 581                 if (n >= PATH_MAX) {
 582                         pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 583                         continue;
 584                 }
 585
 586                 dir2 = opendir(buf);
 587                 if (!dir2)
 588                         continue;
 589                 while ((dent2 = readdir(dir2)) != NULL) {
 590                         if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
 591                                 continue;
 592                         cpunode_map[cpu] = mem;
 593                 }
 594                 closedir(dir2);
 595         }
 596         closedir(dir1);
 597         return 0;
 598 }
 599
 600 size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
 601 {
 602         int i, start = -1;
 603         bool first = true;
 604         size_t ret = 0;
 605
 606 #define COMMA first ? "" : ","
 607
 608         for (i = 0; i < perf_cpu_map__nr(map) + 1; i++) {
 609                 struct perf_cpu cpu = { .cpu = INT_MAX };
 610                 bool last = i == perf_cpu_map__nr(map);
 611
 612                 if (!last)
 613                         cpu = perf_cpu_map__cpu(map, i);
 614
 615                 if (start == -1) {
 616                         start = i;
 617                         if (last) {
 618                                 ret += snprintf(buf + ret, size - ret,
 619                                                 "%s%d", COMMA,
 620                                                 perf_cpu_map__cpu(map, i).cpu);
 621                         }
 622                 } else if (((i - start) != (cpu.cpu - perf_cpu_map__cpu(map, start).cpu)) || last) {
 623                         int end = i - 1;
 624
 625                         if (start == end) {
 626                                 ret += snprintf(buf + ret, size - ret,
 627                                                 "%s%d", COMMA,
 628                                                 perf_cpu_map__cpu(map, start).cpu);
 629                         } else {
 630                                 ret += snprintf(buf + ret, size - ret,
 631                                                 "%s%d-%d", COMMA,
 632                                                 perf_cpu_map__cpu(map, start).cpu, perf_cpu_map__cpu(map, end).cpu);
 633                         }
 634                         first = false;
 635                         start = i;
 636                 }
 637         }
 638
 639 #undef COMMA
 640
 641         pr_debug2("cpumask list: %s\n", buf);
 642         return ret;
 643 }
 644
 645 static char hex_char(unsigned char val)
 646 {
 647         if (val < 10)
 648                 return val + '0';
 649         if (val < 16)
 650                 return val - 10 + 'a';
 651         return '?';
 652 }
 653
 654 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
 655 {
 656         int idx;
 657         char *ptr = buf;
 658         unsigned char *bitmap;
 659         struct perf_cpu c, last_cpu = perf_cpu_map__max(map);
 660
 661         if (buf == NULL)
 662                 return 0;
 663
 664         bitmap = zalloc(last_cpu.cpu / 8 + 1);
 665         if (bitmap == NULL) {
 666                 buf[0] = '\0';
 667                 return 0;
 668         }
 669
 670         perf_cpu_map__for_each_cpu(c, idx, map)
 671                 bitmap[c.cpu / 8] |= 1 << (c.cpu % 8);
 672
 673         for (int cpu = last_cpu.cpu / 4 * 4; cpu >= 0; cpu -= 4) {
 674                 unsigned char bits = bitmap[cpu / 8];
 675
 676                 if (cpu % 8)
 677                         bits >>= 4;
 678                 else
 679                         bits &= 0xf;
 680
 681                 *ptr++ = hex_char(bits);
 682                 if ((cpu % 32) == 0 && cpu > 0)
 683                         *ptr++ = ',';
 684         }
 685         *ptr = '\0';
 686         free(bitmap);
 687
 688         buf[size - 1] = '\0';
 689         return ptr - buf;
 690 }
 691
 692 struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
 693 {
 694         static struct perf_cpu_map *online;
 695
 696         if (!online)
 697                 online = perf_cpu_map__new_online_cpus(); /* from /sys/devices/system/cpu/online */
 698
 699         return online;
 700 }
 701
 702 bool aggr_cpu_id__equal(const struct aggr_cpu_id *a, const struct aggr_cpu_id *b)
 703 {
 704         return a->thread_idx == b->thread_idx &&
 705                 a->node == b->node &&
 706                 a->socket == b->socket &&
 707                 a->die == b->die &&
 708                 a->cluster == b->cluster &&
 709                 a->cache_lvl == b->cache_lvl &&
 710                 a->cache == b->cache &&
 711                 a->core == b->core &&
 712                 a->cpu.cpu == b->cpu.cpu;
 713 }
 714
 715 bool aggr_cpu_id__is_empty(const struct aggr_cpu_id *a)
 716 {
 717         return a->thread_idx == -1 &&
 718                 a->node == -1 &&
 719                 a->socket == -1 &&
 720                 a->die == -1 &&
 721                 a->cluster == -1 &&
 722                 a->cache_lvl == -1 &&
 723                 a->cache == -1 &&
 724                 a->core == -1 &&
 725                 a->cpu.cpu == -1;
 726 }
 727
 728 struct aggr_cpu_id aggr_cpu_id__empty(void)
 729 {
 730         struct aggr_cpu_id ret = {
 731                 .thread_idx = -1,
 732                 .node = -1,
 733                 .socket = -1,
 734                 .die = -1,
 735                 .cluster = -1,
 736                 .cache_lvl = -1,
 737                 .cache = -1,
 738                 .core = -1,
 739                 .cpu = (struct perf_cpu){ .cpu = -1 },
 740         };
 741         return ret;
 742 }