1 // SPDX-License-Identifier: GPL-2.0 2 #include "builtin.h" 3 #include "perf.h" 4 5 #include "util/evlist.h" 6 #include "util/evsel.h" 7 #include "util/util.h" 8 #include "util/config.h" 9 #include "util/map.h" 10 #include "util/symbol.h" 11 #include "util/thread.h" 12 #include "util/header.h" 13 #include "util/session.h" 14 #include "util/tool.h" 15 #include "util/callchain.h" 16 #include "util/time-utils.h" 17 18 #include <subcmd/parse-options.h> 19 #include "util/trace-event.h" 20 #include "util/data.h" 21 #include "util/cpumap.h" 22 23 #include "util/debug.h" 24 25 #include <linux/kernel.h> 26 #include <linux/rbtree.h> 27 #include <linux/string.h> 28 #include <errno.h> 29 #include <inttypes.h> 30 #include <locale.h> 31 #include <regex.h> 32 33 #include "sane_ctype.h" 34 35 static int kmem_slab; 36 static int kmem_page; 37 38 static long kmem_page_size; 39 static enum { 40 KMEM_SLAB, 41 KMEM_PAGE, 42 } kmem_default = KMEM_SLAB; /* for backward compatibility */ 43 44 struct alloc_stat; 45 typedef int (*sort_fn_t)(void *, void *); 46 47 static int alloc_flag; 48 static int caller_flag; 49 50 static int alloc_lines = -1; 51 static int caller_lines = -1; 52 53 static bool raw_ip; 54 55 struct alloc_stat { 56 u64 call_site; 57 u64 ptr; 58 u64 bytes_req; 59 u64 bytes_alloc; 60 u64 last_alloc; 61 u32 hit; 62 u32 pingpong; 63 64 short alloc_cpu; 65 66 struct rb_node node; 67 }; 68 69 static struct rb_root root_alloc_stat; 70 static struct rb_root root_alloc_sorted; 71 static struct rb_root root_caller_stat; 72 static struct rb_root root_caller_sorted; 73 74 static unsigned long total_requested, total_allocated, total_freed; 75 static unsigned long nr_allocs, nr_cross_allocs; 76 77 /* filters for controlling start and stop of time of analysis */ 78 static struct perf_time_interval ptime; 79 const char *time_str; 80 81 static int insert_alloc_stat(unsigned long call_site, unsigned long ptr, 82 int bytes_req, int bytes_alloc, int cpu) 83 { 84 struct rb_node **node = &root_alloc_stat.rb_node; 85 struct rb_node *parent = NULL; 86 struct alloc_stat *data = NULL; 87 88 while (*node) { 89 parent = *node; 90 data = rb_entry(*node, struct alloc_stat, node); 91 92 if (ptr > data->ptr) 93 node = &(*node)->rb_right; 94 else if (ptr < data->ptr) 95 node = &(*node)->rb_left; 96 else 97 break; 98 } 99 100 if (data && data->ptr == ptr) { 101 data->hit++; 102 data->bytes_req += bytes_req; 103 data->bytes_alloc += bytes_alloc; 104 } else { 105 data = malloc(sizeof(*data)); 106 if (!data) { 107 pr_err("%s: malloc failed\n", __func__); 108 return -1; 109 } 110 data->ptr = ptr; 111 data->pingpong = 0; 112 data->hit = 1; 113 data->bytes_req = bytes_req; 114 data->bytes_alloc = bytes_alloc; 115 116 rb_link_node(&data->node, parent, node); 117 rb_insert_color(&data->node, &root_alloc_stat); 118 } 119 data->call_site = call_site; 120 data->alloc_cpu = cpu; 121 data->last_alloc = bytes_alloc; 122 123 return 0; 124 } 125 126 static int insert_caller_stat(unsigned long call_site, 127 int bytes_req, int bytes_alloc) 128 { 129 struct rb_node **node = &root_caller_stat.rb_node; 130 struct rb_node *parent = NULL; 131 struct alloc_stat *data = NULL; 132 133 while (*node) { 134 parent = *node; 135 data = rb_entry(*node, struct alloc_stat, node); 136 137 if (call_site > data->call_site) 138 node = &(*node)->rb_right; 139 else if (call_site < data->call_site) 140 node = &(*node)->rb_left; 141 else 142 break; 143 } 144 145 if (data && data->call_site == call_site) { 146 data->hit++; 147 data->bytes_req += bytes_req; 148 data->bytes_alloc += bytes_alloc; 149 } else { 150 data = malloc(sizeof(*data)); 151 if (!data) { 152 pr_err("%s: malloc failed\n", __func__); 153 return -1; 154 } 155 data->call_site = call_site; 156 data->pingpong = 0; 157 data->hit = 1; 158 data->bytes_req = bytes_req; 159 data->bytes_alloc = bytes_alloc; 160 161 rb_link_node(&data->node, parent, node); 162 rb_insert_color(&data->node, &root_caller_stat); 163 } 164 165 return 0; 166 } 167 168 static int perf_evsel__process_alloc_event(struct perf_evsel *evsel, 169 struct perf_sample *sample) 170 { 171 unsigned long ptr = perf_evsel__intval(evsel, sample, "ptr"), 172 call_site = perf_evsel__intval(evsel, sample, "call_site"); 173 int bytes_req = perf_evsel__intval(evsel, sample, "bytes_req"), 174 bytes_alloc = perf_evsel__intval(evsel, sample, "bytes_alloc"); 175 176 if (insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, sample->cpu) || 177 insert_caller_stat(call_site, bytes_req, bytes_alloc)) 178 return -1; 179 180 total_requested += bytes_req; 181 total_allocated += bytes_alloc; 182 183 nr_allocs++; 184 return 0; 185 } 186 187 static int perf_evsel__process_alloc_node_event(struct perf_evsel *evsel, 188 struct perf_sample *sample) 189 { 190 int ret = perf_evsel__process_alloc_event(evsel, sample); 191 192 if (!ret) { 193 int node1 = cpu__get_node(sample->cpu), 194 node2 = perf_evsel__intval(evsel, sample, "node"); 195 196 if (node1 != node2) 197 nr_cross_allocs++; 198 } 199 200 return ret; 201 } 202 203 static int ptr_cmp(void *, void *); 204 static int slab_callsite_cmp(void *, void *); 205 206 static struct alloc_stat *search_alloc_stat(unsigned long ptr, 207 unsigned long call_site, 208 struct rb_root *root, 209 sort_fn_t sort_fn) 210 { 211 struct rb_node *node = root->rb_node; 212 struct alloc_stat key = { .ptr = ptr, .call_site = call_site }; 213 214 while (node) { 215 struct alloc_stat *data; 216 int cmp; 217 218 data = rb_entry(node, struct alloc_stat, node); 219 220 cmp = sort_fn(&key, data); 221 if (cmp < 0) 222 node = node->rb_left; 223 else if (cmp > 0) 224 node = node->rb_right; 225 else 226 return data; 227 } 228 return NULL; 229 } 230 231 static int perf_evsel__process_free_event(struct perf_evsel *evsel, 232 struct perf_sample *sample) 233 { 234 unsigned long ptr = perf_evsel__intval(evsel, sample, "ptr"); 235 struct alloc_stat *s_alloc, *s_caller; 236 237 s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp); 238 if (!s_alloc) 239 return 0; 240 241 total_freed += s_alloc->last_alloc; 242 243 if ((short)sample->cpu != s_alloc->alloc_cpu) { 244 s_alloc->pingpong++; 245 246 s_caller = search_alloc_stat(0, s_alloc->call_site, 247 &root_caller_stat, 248 slab_callsite_cmp); 249 if (!s_caller) 250 return -1; 251 s_caller->pingpong++; 252 } 253 s_alloc->alloc_cpu = -1; 254 255 return 0; 256 } 257 258 static u64 total_page_alloc_bytes; 259 static u64 total_page_free_bytes; 260 static u64 total_page_nomatch_bytes; 261 static u64 total_page_fail_bytes; 262 static unsigned long nr_page_allocs; 263 static unsigned long nr_page_frees; 264 static unsigned long nr_page_fails; 265 static unsigned long nr_page_nomatch; 266 267 static bool use_pfn; 268 static bool live_page; 269 static struct perf_session *kmem_session; 270 271 #define MAX_MIGRATE_TYPES 6 272 #define MAX_PAGE_ORDER 11 273 274 static int order_stats[MAX_PAGE_ORDER][MAX_MIGRATE_TYPES]; 275 276 struct page_stat { 277 struct rb_node node; 278 u64 page; 279 u64 callsite; 280 int order; 281 unsigned gfp_flags; 282 unsigned migrate_type; 283 u64 alloc_bytes; 284 u64 free_bytes; 285 int nr_alloc; 286 int nr_free; 287 }; 288 289 static struct rb_root page_live_tree; 290 static struct rb_root page_alloc_tree; 291 static struct rb_root page_alloc_sorted; 292 static struct rb_root page_caller_tree; 293 static struct rb_root page_caller_sorted; 294 295 struct alloc_func { 296 u64 start; 297 u64 end; 298 char *name; 299 }; 300 301 static int nr_alloc_funcs; 302 static struct alloc_func *alloc_func_list; 303 304 static int funcmp(const void *a, const void *b) 305 { 306 const struct alloc_func *fa = a; 307 const struct alloc_func *fb = b; 308 309 if (fa->start > fb->start) 310 return 1; 311 else 312 return -1; 313 } 314 315 static int callcmp(const void *a, const void *b) 316 { 317 const struct alloc_func *fa = a; 318 const struct alloc_func *fb = b; 319 320 if (fb->start <= fa->start && fa->end < fb->end) 321 return 0; 322 323 if (fa->start > fb->start) 324 return 1; 325 else 326 return -1; 327 } 328 329 static int build_alloc_func_list(void) 330 { 331 int ret; 332 struct map *kernel_map; 333 struct symbol *sym; 334 struct rb_node *node; 335 struct alloc_func *func; 336 struct machine *machine = &kmem_session->machines.host; 337 regex_t alloc_func_regex; 338 static const char pattern[] = "^_?_?(alloc|get_free|get_zeroed)_pages?"; 339 340 ret = regcomp(&alloc_func_regex, pattern, REG_EXTENDED); 341 if (ret) { 342 char err[BUFSIZ]; 343 344 regerror(ret, &alloc_func_regex, err, sizeof(err)); 345 pr_err("Invalid regex: %s\n%s", pattern, err); 346 return -EINVAL; 347 } 348 349 kernel_map = machine__kernel_map(machine); 350 if (map__load(kernel_map) < 0) { 351 pr_err("cannot load kernel map\n"); 352 return -ENOENT; 353 } 354 355 map__for_each_symbol(kernel_map, sym, node) { 356 if (regexec(&alloc_func_regex, sym->name, 0, NULL, 0)) 357 continue; 358 359 func = realloc(alloc_func_list, 360 (nr_alloc_funcs + 1) * sizeof(*func)); 361 if (func == NULL) 362 return -ENOMEM; 363 364 pr_debug("alloc func: %s\n", sym->name); 365 func[nr_alloc_funcs].start = sym->start; 366 func[nr_alloc_funcs].end = sym->end; 367 func[nr_alloc_funcs].name = sym->name; 368 369 alloc_func_list = func; 370 nr_alloc_funcs++; 371 } 372 373 qsort(alloc_func_list, nr_alloc_funcs, sizeof(*func), funcmp); 374 375 regfree(&alloc_func_regex); 376 return 0; 377 } 378 379 /* 380 * Find first non-memory allocation function from callchain. 381 * The allocation functions are in the 'alloc_func_list'. 382 */ 383 static u64 find_callsite(struct perf_evsel *evsel, struct perf_sample *sample) 384 { 385 struct addr_location al; 386 struct machine *machine = &kmem_session->machines.host; 387 struct callchain_cursor_node *node; 388 389 if (alloc_func_list == NULL) { 390 if (build_alloc_func_list() < 0) 391 goto out; 392 } 393 394 al.thread = machine__findnew_thread(machine, sample->pid, sample->tid); 395 sample__resolve_callchain(sample, &callchain_cursor, NULL, evsel, &al, 16); 396 397 callchain_cursor_commit(&callchain_cursor); 398 while (true) { 399 struct alloc_func key, *caller; 400 u64 addr; 401 402 node = callchain_cursor_current(&callchain_cursor); 403 if (node == NULL) 404 break; 405 406 key.start = key.end = node->ip; 407 caller = bsearch(&key, alloc_func_list, nr_alloc_funcs, 408 sizeof(key), callcmp); 409 if (!caller) { 410 /* found */ 411 if (node->map) 412 addr = map__unmap_ip(node->map, node->ip); 413 else 414 addr = node->ip; 415 416 return addr; 417 } else 418 pr_debug3("skipping alloc function: %s\n", caller->name); 419 420 callchain_cursor_advance(&callchain_cursor); 421 } 422 423 out: 424 pr_debug2("unknown callsite: %"PRIx64 "\n", sample->ip); 425 return sample->ip; 426 } 427 428 struct sort_dimension { 429 const char name[20]; 430 sort_fn_t cmp; 431 struct list_head list; 432 }; 433 434 static LIST_HEAD(page_alloc_sort_input); 435 static LIST_HEAD(page_caller_sort_input); 436 437 static struct page_stat * 438 __page_stat__findnew_page(struct page_stat *pstat, bool create) 439 { 440 struct rb_node **node = &page_live_tree.rb_node; 441 struct rb_node *parent = NULL; 442 struct page_stat *data; 443 444 while (*node) { 445 s64 cmp; 446 447 parent = *node; 448 data = rb_entry(*node, struct page_stat, node); 449 450 cmp = data->page - pstat->page; 451 if (cmp < 0) 452 node = &parent->rb_left; 453 else if (cmp > 0) 454 node = &parent->rb_right; 455 else 456 return data; 457 } 458 459 if (!create) 460 return NULL; 461 462 data = zalloc(sizeof(*data)); 463 if (data != NULL) { 464 data->page = pstat->page; 465 data->order = pstat->order; 466 data->gfp_flags = pstat->gfp_flags; 467 data->migrate_type = pstat->migrate_type; 468 469 rb_link_node(&data->node, parent, node); 470 rb_insert_color(&data->node, &page_live_tree); 471 } 472 473 return data; 474 } 475 476 static struct page_stat *page_stat__find_page(struct page_stat *pstat) 477 { 478 return __page_stat__findnew_page(pstat, false); 479 } 480 481 static struct page_stat *page_stat__findnew_page(struct page_stat *pstat) 482 { 483 return __page_stat__findnew_page(pstat, true); 484 } 485 486 static struct page_stat * 487 __page_stat__findnew_alloc(struct page_stat *pstat, bool create) 488 { 489 struct rb_node **node = &page_alloc_tree.rb_node; 490 struct rb_node *parent = NULL; 491 struct page_stat *data; 492 struct sort_dimension *sort; 493 494 while (*node) { 495 int cmp = 0; 496 497 parent = *node; 498 data = rb_entry(*node, struct page_stat, node); 499 500 list_for_each_entry(sort, &page_alloc_sort_input, list) { 501 cmp = sort->cmp(pstat, data); 502 if (cmp) 503 break; 504 } 505 506 if (cmp < 0) 507 node = &parent->rb_left; 508 else if (cmp > 0) 509 node = &parent->rb_right; 510 else 511 return data; 512 } 513 514 if (!create) 515 return NULL; 516 517 data = zalloc(sizeof(*data)); 518 if (data != NULL) { 519 data->page = pstat->page; 520 data->order = pstat->order; 521 data->gfp_flags = pstat->gfp_flags; 522 data->migrate_type = pstat->migrate_type; 523 524 rb_link_node(&data->node, parent, node); 525 rb_insert_color(&data->node, &page_alloc_tree); 526 } 527 528 return data; 529 } 530 531 static struct page_stat *page_stat__find_alloc(struct page_stat *pstat) 532 { 533 return __page_stat__findnew_alloc(pstat, false); 534 } 535 536 static struct page_stat *page_stat__findnew_alloc(struct page_stat *pstat) 537 { 538 return __page_stat__findnew_alloc(pstat, true); 539 } 540 541 static struct page_stat * 542 __page_stat__findnew_caller(struct page_stat *pstat, bool create) 543 { 544 struct rb_node **node = &page_caller_tree.rb_node; 545 struct rb_node *parent = NULL; 546 struct page_stat *data; 547 struct sort_dimension *sort; 548 549 while (*node) { 550 int cmp = 0; 551 552 parent = *node; 553 data = rb_entry(*node, struct page_stat, node); 554 555 list_for_each_entry(sort, &page_caller_sort_input, list) { 556 cmp = sort->cmp(pstat, data); 557 if (cmp) 558 break; 559 } 560 561 if (cmp < 0) 562 node = &parent->rb_left; 563 else if (cmp > 0) 564 node = &parent->rb_right; 565 else 566 return data; 567 } 568 569 if (!create) 570 return NULL; 571 572 data = zalloc(sizeof(*data)); 573 if (data != NULL) { 574 data->callsite = pstat->callsite; 575 data->order = pstat->order; 576 data->gfp_flags = pstat->gfp_flags; 577 data->migrate_type = pstat->migrate_type; 578 579 rb_link_node(&data->node, parent, node); 580 rb_insert_color(&data->node, &page_caller_tree); 581 } 582 583 return data; 584 } 585 586 static struct page_stat *page_stat__find_caller(struct page_stat *pstat) 587 { 588 return __page_stat__findnew_caller(pstat, false); 589 } 590 591 static struct page_stat *page_stat__findnew_caller(struct page_stat *pstat) 592 { 593 return __page_stat__findnew_caller(pstat, true); 594 } 595 596 static bool valid_page(u64 pfn_or_page) 597 { 598 if (use_pfn && pfn_or_page == -1UL) 599 return false; 600 if (!use_pfn && pfn_or_page == 0) 601 return false; 602 return true; 603 } 604 605 struct gfp_flag { 606 unsigned int flags; 607 char *compact_str; 608 char *human_readable; 609 }; 610 611 static struct gfp_flag *gfps; 612 static int nr_gfps; 613 614 static int gfpcmp(const void *a, const void *b) 615 { 616 const struct gfp_flag *fa = a; 617 const struct gfp_flag *fb = b; 618 619 return fa->flags - fb->flags; 620 } 621 622 /* see include/trace/events/mmflags.h */ 623 static const struct { 624 const char *original; 625 const char *compact; 626 } gfp_compact_table[] = { 627 { "GFP_TRANSHUGE", "THP" }, 628 { "GFP_TRANSHUGE_LIGHT", "THL" }, 629 { "GFP_HIGHUSER_MOVABLE", "HUM" }, 630 { "GFP_HIGHUSER", "HU" }, 631 { "GFP_USER", "U" }, 632 { "GFP_KERNEL_ACCOUNT", "KAC" }, 633 { "GFP_KERNEL", "K" }, 634 { "GFP_NOFS", "NF" }, 635 { "GFP_ATOMIC", "A" }, 636 { "GFP_NOIO", "NI" }, 637 { "GFP_NOWAIT", "NW" }, 638 { "GFP_DMA", "D" }, 639 { "__GFP_HIGHMEM", "HM" }, 640 { "GFP_DMA32", "D32" }, 641 { "__GFP_HIGH", "H" }, 642 { "__GFP_ATOMIC", "_A" }, 643 { "__GFP_IO", "I" }, 644 { "__GFP_FS", "F" }, 645 { "__GFP_NOWARN", "NWR" }, 646 { "__GFP_RETRY_MAYFAIL", "R" }, 647 { "__GFP_NOFAIL", "NF" }, 648 { "__GFP_NORETRY", "NR" }, 649 { "__GFP_COMP", "C" }, 650 { "__GFP_ZERO", "Z" }, 651 { "__GFP_NOMEMALLOC", "NMA" }, 652 { "__GFP_MEMALLOC", "MA" }, 653 { "__GFP_HARDWALL", "HW" }, 654 { "__GFP_THISNODE", "TN" }, 655 { "__GFP_RECLAIMABLE", "RC" }, 656 { "__GFP_MOVABLE", "M" }, 657 { "__GFP_ACCOUNT", "AC" }, 658 { "__GFP_WRITE", "WR" }, 659 { "__GFP_RECLAIM", "R" }, 660 { "__GFP_DIRECT_RECLAIM", "DR" }, 661 { "__GFP_KSWAPD_RECLAIM", "KR" }, 662 }; 663 664 static size_t max_gfp_len; 665 666 static char *compact_gfp_flags(char *gfp_flags) 667 { 668 char *orig_flags = strdup(gfp_flags); 669 char *new_flags = NULL; 670 char *str, *pos = NULL; 671 size_t len = 0; 672 673 if (orig_flags == NULL) 674 return NULL; 675 676 str = strtok_r(orig_flags, "|", &pos); 677 while (str) { 678 size_t i; 679 char *new; 680 const char *cpt; 681 682 for (i = 0; i < ARRAY_SIZE(gfp_compact_table); i++) { 683 if (strcmp(gfp_compact_table[i].original, str)) 684 continue; 685 686 cpt = gfp_compact_table[i].compact; 687 new = realloc(new_flags, len + strlen(cpt) + 2); 688 if (new == NULL) { 689 free(new_flags); 690 return NULL; 691 } 692 693 new_flags = new; 694 695 if (!len) { 696 strcpy(new_flags, cpt); 697 } else { 698 strcat(new_flags, "|"); 699 strcat(new_flags, cpt); 700 len++; 701 } 702 703 len += strlen(cpt); 704 } 705 706 str = strtok_r(NULL, "|", &pos); 707 } 708 709 if (max_gfp_len < len) 710 max_gfp_len = len; 711 712 free(orig_flags); 713 return new_flags; 714 } 715 716 static char *compact_gfp_string(unsigned long gfp_flags) 717 { 718 struct gfp_flag key = { 719 .flags = gfp_flags, 720 }; 721 struct gfp_flag *gfp; 722 723 gfp = bsearch(&key, gfps, nr_gfps, sizeof(*gfps), gfpcmp); 724 if (gfp) 725 return gfp->compact_str; 726 727 return NULL; 728 } 729 730 static int parse_gfp_flags(struct perf_evsel *evsel, struct perf_sample *sample, 731 unsigned int gfp_flags) 732 { 733 struct tep_record record = { 734 .cpu = sample->cpu, 735 .data = sample->raw_data, 736 .size = sample->raw_size, 737 }; 738 struct trace_seq seq; 739 char *str, *pos = NULL; 740 741 if (nr_gfps) { 742 struct gfp_flag key = { 743 .flags = gfp_flags, 744 }; 745 746 if (bsearch(&key, gfps, nr_gfps, sizeof(*gfps), gfpcmp)) 747 return 0; 748 } 749 750 trace_seq_init(&seq); 751 tep_event_info(&seq, evsel->tp_format, &record); 752 753 str = strtok_r(seq.buffer, " ", &pos); 754 while (str) { 755 if (!strncmp(str, "gfp_flags=", 10)) { 756 struct gfp_flag *new; 757 758 new = realloc(gfps, (nr_gfps + 1) * sizeof(*gfps)); 759 if (new == NULL) 760 return -ENOMEM; 761 762 gfps = new; 763 new += nr_gfps++; 764 765 new->flags = gfp_flags; 766 new->human_readable = strdup(str + 10); 767 new->compact_str = compact_gfp_flags(str + 10); 768 if (!new->human_readable || !new->compact_str) 769 return -ENOMEM; 770 771 qsort(gfps, nr_gfps, sizeof(*gfps), gfpcmp); 772 } 773 774 str = strtok_r(NULL, " ", &pos); 775 } 776 777 trace_seq_destroy(&seq); 778 return 0; 779 } 780 781 static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel, 782 struct perf_sample *sample) 783 { 784 u64 page; 785 unsigned int order = perf_evsel__intval(evsel, sample, "order"); 786 unsigned int gfp_flags = perf_evsel__intval(evsel, sample, "gfp_flags"); 787 unsigned int migrate_type = perf_evsel__intval(evsel, sample, 788 "migratetype"); 789 u64 bytes = kmem_page_size << order; 790 u64 callsite; 791 struct page_stat *pstat; 792 struct page_stat this = { 793 .order = order, 794 .gfp_flags = gfp_flags, 795 .migrate_type = migrate_type, 796 }; 797 798 if (use_pfn) 799 page = perf_evsel__intval(evsel, sample, "pfn"); 800 else 801 page = perf_evsel__intval(evsel, sample, "page"); 802 803 nr_page_allocs++; 804 total_page_alloc_bytes += bytes; 805 806 if (!valid_page(page)) { 807 nr_page_fails++; 808 total_page_fail_bytes += bytes; 809 810 return 0; 811 } 812 813 if (parse_gfp_flags(evsel, sample, gfp_flags) < 0) 814 return -1; 815 816 callsite = find_callsite(evsel, sample); 817 818 /* 819 * This is to find the current page (with correct gfp flags and 820 * migrate type) at free event. 821 */ 822 this.page = page; 823 pstat = page_stat__findnew_page(&this); 824 if (pstat == NULL) 825 return -ENOMEM; 826 827 pstat->nr_alloc++; 828 pstat->alloc_bytes += bytes; 829 pstat->callsite = callsite; 830 831 if (!live_page) { 832 pstat = page_stat__findnew_alloc(&this); 833 if (pstat == NULL) 834 return -ENOMEM; 835 836 pstat->nr_alloc++; 837 pstat->alloc_bytes += bytes; 838 pstat->callsite = callsite; 839 } 840 841 this.callsite = callsite; 842 pstat = page_stat__findnew_caller(&this); 843 if (pstat == NULL) 844 return -ENOMEM; 845 846 pstat->nr_alloc++; 847 pstat->alloc_bytes += bytes; 848 849 order_stats[order][migrate_type]++; 850 851 return 0; 852 } 853 854 static int perf_evsel__process_page_free_event(struct perf_evsel *evsel, 855 struct perf_sample *sample) 856 { 857 u64 page; 858 unsigned int order = perf_evsel__intval(evsel, sample, "order"); 859 u64 bytes = kmem_page_size << order; 860 struct page_stat *pstat; 861 struct page_stat this = { 862 .order = order, 863 }; 864 865 if (use_pfn) 866 page = perf_evsel__intval(evsel, sample, "pfn"); 867 else 868 page = perf_evsel__intval(evsel, sample, "page"); 869 870 nr_page_frees++; 871 total_page_free_bytes += bytes; 872 873 this.page = page; 874 pstat = page_stat__find_page(&this); 875 if (pstat == NULL) { 876 pr_debug2("missing free at page %"PRIx64" (order: %d)\n", 877 page, order); 878 879 nr_page_nomatch++; 880 total_page_nomatch_bytes += bytes; 881 882 return 0; 883 } 884 885 this.gfp_flags = pstat->gfp_flags; 886 this.migrate_type = pstat->migrate_type; 887 this.callsite = pstat->callsite; 888 889 rb_erase(&pstat->node, &page_live_tree); 890 free(pstat); 891 892 if (live_page) { 893 order_stats[this.order][this.migrate_type]--; 894 } else { 895 pstat = page_stat__find_alloc(&this); 896 if (pstat == NULL) 897 return -ENOMEM; 898 899 pstat->nr_free++; 900 pstat->free_bytes += bytes; 901 } 902 903 pstat = page_stat__find_caller(&this); 904 if (pstat == NULL) 905 return -ENOENT; 906 907 pstat->nr_free++; 908 pstat->free_bytes += bytes; 909 910 if (live_page) { 911 pstat->nr_alloc--; 912 pstat->alloc_bytes -= bytes; 913 914 if (pstat->nr_alloc == 0) { 915 rb_erase(&pstat->node, &page_caller_tree); 916 free(pstat); 917 } 918 } 919 920 return 0; 921 } 922 923 static bool perf_kmem__skip_sample(struct perf_sample *sample) 924 { 925 /* skip sample based on time? */ 926 if (perf_time__skip_sample(&ptime, sample->time)) 927 return true; 928 929 return false; 930 } 931 932 typedef int (*tracepoint_handler)(struct perf_evsel *evsel, 933 struct perf_sample *sample); 934 935 static int process_sample_event(struct perf_tool *tool __maybe_unused, 936 union perf_event *event, 937 struct perf_sample *sample, 938 struct perf_evsel *evsel, 939 struct machine *machine) 940 { 941 int err = 0; 942 struct thread *thread = machine__findnew_thread(machine, sample->pid, 943 sample->tid); 944 945 if (thread == NULL) { 946 pr_debug("problem processing %d event, skipping it.\n", 947 event->header.type); 948 return -1; 949 } 950 951 if (perf_kmem__skip_sample(sample)) 952 return 0; 953 954 dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid); 955 956 if (evsel->handler != NULL) { 957 tracepoint_handler f = evsel->handler; 958 err = f(evsel, sample); 959 } 960 961 thread__put(thread); 962 963 return err; 964 } 965 966 static struct perf_tool perf_kmem = { 967 .sample = process_sample_event, 968 .comm = perf_event__process_comm, 969 .mmap = perf_event__process_mmap, 970 .mmap2 = perf_event__process_mmap2, 971 .namespaces = perf_event__process_namespaces, 972 .ordered_events = true, 973 }; 974 975 static double fragmentation(unsigned long n_req, unsigned long n_alloc) 976 { 977 if (n_alloc == 0) 978 return 0.0; 979 else 980 return 100.0 - (100.0 * n_req / n_alloc); 981 } 982 983 static void __print_slab_result(struct rb_root *root, 984 struct perf_session *session, 985 int n_lines, int is_caller) 986 { 987 struct rb_node *next; 988 struct machine *machine = &session->machines.host; 989 990 printf("%.105s\n", graph_dotted_line); 991 printf(" %-34s |", is_caller ? "Callsite": "Alloc Ptr"); 992 printf(" Total_alloc/Per | Total_req/Per | Hit | Ping-pong | Frag\n"); 993 printf("%.105s\n", graph_dotted_line); 994 995 next = rb_first(root); 996 997 while (next && n_lines--) { 998 struct alloc_stat *data = rb_entry(next, struct alloc_stat, 999 node); 1000 struct symbol *sym = NULL; 1001 struct map *map; 1002 char buf[BUFSIZ]; 1003 u64 addr; 1004 1005 if (is_caller) { 1006 addr = data->call_site; 1007 if (!raw_ip) 1008 sym = machine__find_kernel_symbol(machine, addr, &map); 1009 } else 1010 addr = data->ptr; 1011 1012 if (sym != NULL) 1013 snprintf(buf, sizeof(buf), "%s+%" PRIx64 "", sym->name, 1014 addr - map->unmap_ip(map, sym->start)); 1015 else 1016 snprintf(buf, sizeof(buf), "%#" PRIx64 "", addr); 1017 printf(" %-34s |", buf); 1018 1019 printf(" %9llu/%-5lu | %9llu/%-5lu | %8lu | %9lu | %6.3f%%\n", 1020 (unsigned long long)data->bytes_alloc, 1021 (unsigned long)data->bytes_alloc / data->hit, 1022 (unsigned long long)data->bytes_req, 1023 (unsigned long)data->bytes_req / data->hit, 1024 (unsigned long)data->hit, 1025 (unsigned long)data->pingpong, 1026 fragmentation(data->bytes_req, data->bytes_alloc)); 1027 1028 next = rb_next(next); 1029 } 1030 1031 if (n_lines == -1) 1032 printf(" ... | ... | ... | ... | ... | ... \n"); 1033 1034 printf("%.105s\n", graph_dotted_line); 1035 } 1036 1037 static const char * const migrate_type_str[] = { 1038 "UNMOVABL", 1039 "RECLAIM", 1040 "MOVABLE", 1041 "RESERVED", 1042 "CMA/ISLT", 1043 "UNKNOWN", 1044 }; 1045 1046 static void __print_page_alloc_result(struct perf_session *session, int n_lines) 1047 { 1048 struct rb_node *next = rb_first(&page_alloc_sorted); 1049 struct machine *machine = &session->machines.host; 1050 const char *format; 1051 int gfp_len = max(strlen("GFP flags"), max_gfp_len); 1052 1053 printf("\n%.105s\n", graph_dotted_line); 1054 printf(" %-16s | %5s alloc (KB) | Hits | Order | Mig.type | %-*s | Callsite\n", 1055 use_pfn ? "PFN" : "Page", live_page ? "Live" : "Total", 1056 gfp_len, "GFP flags"); 1057 printf("%.105s\n", graph_dotted_line); 1058 1059 if (use_pfn) 1060 format = " %16llu | %'16llu | %'9d | %5d | %8s | %-*s | %s\n"; 1061 else 1062 format = " %016llx | %'16llu | %'9d | %5d | %8s | %-*s | %s\n"; 1063 1064 while (next && n_lines--) { 1065 struct page_stat *data; 1066 struct symbol *sym; 1067 struct map *map; 1068 char buf[32]; 1069 char *caller = buf; 1070 1071 data = rb_entry(next, struct page_stat, node); 1072 sym = machine__find_kernel_symbol(machine, data->callsite, &map); 1073 if (sym) 1074 caller = sym->name; 1075 else 1076 scnprintf(buf, sizeof(buf), "%"PRIx64, data->callsite); 1077 1078 printf(format, (unsigned long long)data->page, 1079 (unsigned long long)data->alloc_bytes / 1024, 1080 data->nr_alloc, data->order, 1081 migrate_type_str[data->migrate_type], 1082 gfp_len, compact_gfp_string(data->gfp_flags), caller); 1083 1084 next = rb_next(next); 1085 } 1086 1087 if (n_lines == -1) { 1088 printf(" ... | ... | ... | ... | ... | %-*s | ...\n", 1089 gfp_len, "..."); 1090 } 1091 1092 printf("%.105s\n", graph_dotted_line); 1093 } 1094 1095 static void __print_page_caller_result(struct perf_session *session, int n_lines) 1096 { 1097 struct rb_node *next = rb_first(&page_caller_sorted); 1098 struct machine *machine = &session->machines.host; 1099 int gfp_len = max(strlen("GFP flags"), max_gfp_len); 1100 1101 printf("\n%.105s\n", graph_dotted_line); 1102 printf(" %5s alloc (KB) | Hits | Order | Mig.type | %-*s | Callsite\n", 1103 live_page ? "Live" : "Total", gfp_len, "GFP flags"); 1104 printf("%.105s\n", graph_dotted_line); 1105 1106 while (next && n_lines--) { 1107 struct page_stat *data; 1108 struct symbol *sym; 1109 struct map *map; 1110 char buf[32]; 1111 char *caller = buf; 1112 1113 data = rb_entry(next, struct page_stat, node); 1114 sym = machine__find_kernel_symbol(machine, data->callsite, &map); 1115 if (sym) 1116 caller = sym->name; 1117 else 1118 scnprintf(buf, sizeof(buf), "%"PRIx64, data->callsite); 1119 1120 printf(" %'16llu | %'9d | %5d | %8s | %-*s | %s\n", 1121 (unsigned long long)data->alloc_bytes / 1024, 1122 data->nr_alloc, data->order, 1123 migrate_type_str[data->migrate_type], 1124 gfp_len, compact_gfp_string(data->gfp_flags), caller); 1125 1126 next = rb_next(next); 1127 } 1128 1129 if (n_lines == -1) { 1130 printf(" ... | ... | ... | ... | %-*s | ...\n", 1131 gfp_len, "..."); 1132 } 1133 1134 printf("%.105s\n", graph_dotted_line); 1135 } 1136 1137 static void print_gfp_flags(void) 1138 { 1139 int i; 1140 1141 printf("#\n"); 1142 printf("# GFP flags\n"); 1143 printf("# ---------\n"); 1144 for (i = 0; i < nr_gfps; i++) { 1145 printf("# %08x: %*s: %s\n", gfps[i].flags, 1146 (int) max_gfp_len, gfps[i].compact_str, 1147 gfps[i].human_readable); 1148 } 1149 } 1150 1151 static void print_slab_summary(void) 1152 { 1153 printf("\nSUMMARY (SLAB allocator)"); 1154 printf("\n========================\n"); 1155 printf("Total bytes requested: %'lu\n", total_requested); 1156 printf("Total bytes allocated: %'lu\n", total_allocated); 1157 printf("Total bytes freed: %'lu\n", total_freed); 1158 if (total_allocated > total_freed) { 1159 printf("Net total bytes allocated: %'lu\n", 1160 total_allocated - total_freed); 1161 } 1162 printf("Total bytes wasted on internal fragmentation: %'lu\n", 1163 total_allocated - total_requested); 1164 printf("Internal fragmentation: %f%%\n", 1165 fragmentation(total_requested, total_allocated)); 1166 printf("Cross CPU allocations: %'lu/%'lu\n", nr_cross_allocs, nr_allocs); 1167 } 1168 1169 static void print_page_summary(void) 1170 { 1171 int o, m; 1172 u64 nr_alloc_freed = nr_page_frees - nr_page_nomatch; 1173 u64 total_alloc_freed_bytes = total_page_free_bytes - total_page_nomatch_bytes; 1174 1175 printf("\nSUMMARY (page allocator)"); 1176 printf("\n========================\n"); 1177 printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total allocation requests", 1178 nr_page_allocs, total_page_alloc_bytes / 1024); 1179 printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total free requests", 1180 nr_page_frees, total_page_free_bytes / 1024); 1181 printf("\n"); 1182 1183 printf("%-30s: %'16"PRIu64" [ %'16"PRIu64" KB ]\n", "Total alloc+freed requests", 1184 nr_alloc_freed, (total_alloc_freed_bytes) / 1024); 1185 printf("%-30s: %'16"PRIu64" [ %'16"PRIu64" KB ]\n", "Total alloc-only requests", 1186 nr_page_allocs - nr_alloc_freed, 1187 (total_page_alloc_bytes - total_alloc_freed_bytes) / 1024); 1188 printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total free-only requests", 1189 nr_page_nomatch, total_page_nomatch_bytes / 1024); 1190 printf("\n"); 1191 1192 printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total allocation failures", 1193 nr_page_fails, total_page_fail_bytes / 1024); 1194 printf("\n"); 1195 1196 printf("%5s %12s %12s %12s %12s %12s\n", "Order", "Unmovable", 1197 "Reclaimable", "Movable", "Reserved", "CMA/Isolated"); 1198 printf("%.5s %.12s %.12s %.12s %.12s %.12s\n", graph_dotted_line, 1199 graph_dotted_line, graph_dotted_line, graph_dotted_line, 1200 graph_dotted_line, graph_dotted_line); 1201 1202 for (o = 0; o < MAX_PAGE_ORDER; o++) { 1203 printf("%5d", o); 1204 for (m = 0; m < MAX_MIGRATE_TYPES - 1; m++) { 1205 if (order_stats[o][m]) 1206 printf(" %'12d", order_stats[o][m]); 1207 else 1208 printf(" %12c", '.'); 1209 } 1210 printf("\n"); 1211 } 1212 } 1213 1214 static void print_slab_result(struct perf_session *session) 1215 { 1216 if (caller_flag) 1217 __print_slab_result(&root_caller_sorted, session, caller_lines, 1); 1218 if (alloc_flag) 1219 __print_slab_result(&root_alloc_sorted, session, alloc_lines, 0); 1220 print_slab_summary(); 1221 } 1222 1223 static void print_page_result(struct perf_session *session) 1224 { 1225 if (caller_flag || alloc_flag) 1226 print_gfp_flags(); 1227 if (caller_flag) 1228 __print_page_caller_result(session, caller_lines); 1229 if (alloc_flag) 1230 __print_page_alloc_result(session, alloc_lines); 1231 print_page_summary(); 1232 } 1233 1234 static void print_result(struct perf_session *session) 1235 { 1236 if (kmem_slab) 1237 print_slab_result(session); 1238 if (kmem_page) 1239 print_page_result(session); 1240 } 1241 1242 static LIST_HEAD(slab_caller_sort); 1243 static LIST_HEAD(slab_alloc_sort); 1244 static LIST_HEAD(page_caller_sort); 1245 static LIST_HEAD(page_alloc_sort); 1246 1247 static void sort_slab_insert(struct rb_root *root, struct alloc_stat *data, 1248 struct list_head *sort_list) 1249 { 1250 struct rb_node **new = &(root->rb_node); 1251 struct rb_node *parent = NULL; 1252 struct sort_dimension *sort; 1253 1254 while (*new) { 1255 struct alloc_stat *this; 1256 int cmp = 0; 1257 1258 this = rb_entry(*new, struct alloc_stat, node); 1259 parent = *new; 1260 1261 list_for_each_entry(sort, sort_list, list) { 1262 cmp = sort->cmp(data, this); 1263 if (cmp) 1264 break; 1265 } 1266 1267 if (cmp > 0) 1268 new = &((*new)->rb_left); 1269 else 1270 new = &((*new)->rb_right); 1271 } 1272 1273 rb_link_node(&data->node, parent, new); 1274 rb_insert_color(&data->node, root); 1275 } 1276 1277 static void __sort_slab_result(struct rb_root *root, struct rb_root *root_sorted, 1278 struct list_head *sort_list) 1279 { 1280 struct rb_node *node; 1281 struct alloc_stat *data; 1282 1283 for (;;) { 1284 node = rb_first(root); 1285 if (!node) 1286 break; 1287 1288 rb_erase(node, root); 1289 data = rb_entry(node, struct alloc_stat, node); 1290 sort_slab_insert(root_sorted, data, sort_list); 1291 } 1292 } 1293 1294 static void sort_page_insert(struct rb_root *root, struct page_stat *data, 1295 struct list_head *sort_list) 1296 { 1297 struct rb_node **new = &root->rb_node; 1298 struct rb_node *parent = NULL; 1299 struct sort_dimension *sort; 1300 1301 while (*new) { 1302 struct page_stat *this; 1303 int cmp = 0; 1304 1305 this = rb_entry(*new, struct page_stat, node); 1306 parent = *new; 1307 1308 list_for_each_entry(sort, sort_list, list) { 1309 cmp = sort->cmp(data, this); 1310 if (cmp) 1311 break; 1312 } 1313 1314 if (cmp > 0) 1315 new = &parent->rb_left; 1316 else 1317 new = &parent->rb_right; 1318 } 1319 1320 rb_link_node(&data->node, parent, new); 1321 rb_insert_color(&data->node, root); 1322 } 1323 1324 static void __sort_page_result(struct rb_root *root, struct rb_root *root_sorted, 1325 struct list_head *sort_list) 1326 { 1327 struct rb_node *node; 1328 struct page_stat *data; 1329 1330 for (;;) { 1331 node = rb_first(root); 1332 if (!node) 1333 break; 1334 1335 rb_erase(node, root); 1336 data = rb_entry(node, struct page_stat, node); 1337 sort_page_insert(root_sorted, data, sort_list); 1338 } 1339 } 1340 1341 static void sort_result(void) 1342 { 1343 if (kmem_slab) { 1344 __sort_slab_result(&root_alloc_stat, &root_alloc_sorted, 1345 &slab_alloc_sort); 1346 __sort_slab_result(&root_caller_stat, &root_caller_sorted, 1347 &slab_caller_sort); 1348 } 1349 if (kmem_page) { 1350 if (live_page) 1351 __sort_page_result(&page_live_tree, &page_alloc_sorted, 1352 &page_alloc_sort); 1353 else 1354 __sort_page_result(&page_alloc_tree, &page_alloc_sorted, 1355 &page_alloc_sort); 1356 1357 __sort_page_result(&page_caller_tree, &page_caller_sorted, 1358 &page_caller_sort); 1359 } 1360 } 1361 1362 static int __cmd_kmem(struct perf_session *session) 1363 { 1364 int err = -EINVAL; 1365 struct perf_evsel *evsel; 1366 const struct perf_evsel_str_handler kmem_tracepoints[] = { 1367 /* slab allocator */ 1368 { "kmem:kmalloc", perf_evsel__process_alloc_event, }, 1369 { "kmem:kmem_cache_alloc", perf_evsel__process_alloc_event, }, 1370 { "kmem:kmalloc_node", perf_evsel__process_alloc_node_event, }, 1371 { "kmem:kmem_cache_alloc_node", perf_evsel__process_alloc_node_event, }, 1372 { "kmem:kfree", perf_evsel__process_free_event, }, 1373 { "kmem:kmem_cache_free", perf_evsel__process_free_event, }, 1374 /* page allocator */ 1375 { "kmem:mm_page_alloc", perf_evsel__process_page_alloc_event, }, 1376 { "kmem:mm_page_free", perf_evsel__process_page_free_event, }, 1377 }; 1378 1379 if (!perf_session__has_traces(session, "kmem record")) 1380 goto out; 1381 1382 if (perf_session__set_tracepoints_handlers(session, kmem_tracepoints)) { 1383 pr_err("Initializing perf session tracepoint handlers failed\n"); 1384 goto out; 1385 } 1386 1387 evlist__for_each_entry(session->evlist, evsel) { 1388 if (!strcmp(perf_evsel__name(evsel), "kmem:mm_page_alloc") && 1389 perf_evsel__field(evsel, "pfn")) { 1390 use_pfn = true; 1391 break; 1392 } 1393 } 1394 1395 setup_pager(); 1396 err = perf_session__process_events(session); 1397 if (err != 0) { 1398 pr_err("error during process events: %d\n", err); 1399 goto out; 1400 } 1401 sort_result(); 1402 print_result(session); 1403 out: 1404 return err; 1405 } 1406 1407 /* slab sort keys */ 1408 static int ptr_cmp(void *a, void *b) 1409 { 1410 struct alloc_stat *l = a; 1411 struct alloc_stat *r = b; 1412 1413 if (l->ptr < r->ptr) 1414 return -1; 1415 else if (l->ptr > r->ptr) 1416 return 1; 1417 return 0; 1418 } 1419 1420 static struct sort_dimension ptr_sort_dimension = { 1421 .name = "ptr", 1422 .cmp = ptr_cmp, 1423 }; 1424 1425 static int slab_callsite_cmp(void *a, void *b) 1426 { 1427 struct alloc_stat *l = a; 1428 struct alloc_stat *r = b; 1429 1430 if (l->call_site < r->call_site) 1431 return -1; 1432 else if (l->call_site > r->call_site) 1433 return 1; 1434 return 0; 1435 } 1436 1437 static struct sort_dimension callsite_sort_dimension = { 1438 .name = "callsite", 1439 .cmp = slab_callsite_cmp, 1440 }; 1441 1442 static int hit_cmp(void *a, void *b) 1443 { 1444 struct alloc_stat *l = a; 1445 struct alloc_stat *r = b; 1446 1447 if (l->hit < r->hit) 1448 return -1; 1449 else if (l->hit > r->hit) 1450 return 1; 1451 return 0; 1452 } 1453 1454 static struct sort_dimension hit_sort_dimension = { 1455 .name = "hit", 1456 .cmp = hit_cmp, 1457 }; 1458 1459 static int bytes_cmp(void *a, void *b) 1460 { 1461 struct alloc_stat *l = a; 1462 struct alloc_stat *r = b; 1463 1464 if (l->bytes_alloc < r->bytes_alloc) 1465 return -1; 1466 else if (l->bytes_alloc > r->bytes_alloc) 1467 return 1; 1468 return 0; 1469 } 1470 1471 static struct sort_dimension bytes_sort_dimension = { 1472 .name = "bytes", 1473 .cmp = bytes_cmp, 1474 }; 1475 1476 static int frag_cmp(void *a, void *b) 1477 { 1478 double x, y; 1479 struct alloc_stat *l = a; 1480 struct alloc_stat *r = b; 1481 1482 x = fragmentation(l->bytes_req, l->bytes_alloc); 1483 y = fragmentation(r->bytes_req, r->bytes_alloc); 1484 1485 if (x < y) 1486 return -1; 1487 else if (x > y) 1488 return 1; 1489 return 0; 1490 } 1491 1492 static struct sort_dimension frag_sort_dimension = { 1493 .name = "frag", 1494 .cmp = frag_cmp, 1495 }; 1496 1497 static int pingpong_cmp(void *a, void *b) 1498 { 1499 struct alloc_stat *l = a; 1500 struct alloc_stat *r = b; 1501 1502 if (l->pingpong < r->pingpong) 1503 return -1; 1504 else if (l->pingpong > r->pingpong) 1505 return 1; 1506 return 0; 1507 } 1508 1509 static struct sort_dimension pingpong_sort_dimension = { 1510 .name = "pingpong", 1511 .cmp = pingpong_cmp, 1512 }; 1513 1514 /* page sort keys */ 1515 static int page_cmp(void *a, void *b) 1516 { 1517 struct page_stat *l = a; 1518 struct page_stat *r = b; 1519 1520 if (l->page < r->page) 1521 return -1; 1522 else if (l->page > r->page) 1523 return 1; 1524 return 0; 1525 } 1526 1527 static struct sort_dimension page_sort_dimension = { 1528 .name = "page", 1529 .cmp = page_cmp, 1530 }; 1531 1532 static int page_callsite_cmp(void *a, void *b) 1533 { 1534 struct page_stat *l = a; 1535 struct page_stat *r = b; 1536 1537 if (l->callsite < r->callsite) 1538 return -1; 1539 else if (l->callsite > r->callsite) 1540 return 1; 1541 return 0; 1542 } 1543 1544 static struct sort_dimension page_callsite_sort_dimension = { 1545 .name = "callsite", 1546 .cmp = page_callsite_cmp, 1547 }; 1548 1549 static int page_hit_cmp(void *a, void *b) 1550 { 1551 struct page_stat *l = a; 1552 struct page_stat *r = b; 1553 1554 if (l->nr_alloc < r->nr_alloc) 1555 return -1; 1556 else if (l->nr_alloc > r->nr_alloc) 1557 return 1; 1558 return 0; 1559 } 1560 1561 static struct sort_dimension page_hit_sort_dimension = { 1562 .name = "hit", 1563 .cmp = page_hit_cmp, 1564 }; 1565 1566 static int page_bytes_cmp(void *a, void *b) 1567 { 1568 struct page_stat *l = a; 1569 struct page_stat *r = b; 1570 1571 if (l->alloc_bytes < r->alloc_bytes) 1572 return -1; 1573 else if (l->alloc_bytes > r->alloc_bytes) 1574 return 1; 1575 return 0; 1576 } 1577 1578 static struct sort_dimension page_bytes_sort_dimension = { 1579 .name = "bytes", 1580 .cmp = page_bytes_cmp, 1581 }; 1582 1583 static int page_order_cmp(void *a, void *b) 1584 { 1585 struct page_stat *l = a; 1586 struct page_stat *r = b; 1587 1588 if (l->order < r->order) 1589 return -1; 1590 else if (l->order > r->order) 1591 return 1; 1592 return 0; 1593 } 1594 1595 static struct sort_dimension page_order_sort_dimension = { 1596 .name = "order", 1597 .cmp = page_order_cmp, 1598 }; 1599 1600 static int migrate_type_cmp(void *a, void *b) 1601 { 1602 struct page_stat *l = a; 1603 struct page_stat *r = b; 1604 1605 /* for internal use to find free'd page */ 1606 if (l->migrate_type == -1U) 1607 return 0; 1608 1609 if (l->migrate_type < r->migrate_type) 1610 return -1; 1611 else if (l->migrate_type > r->migrate_type) 1612 return 1; 1613 return 0; 1614 } 1615 1616 static struct sort_dimension migrate_type_sort_dimension = { 1617 .name = "migtype", 1618 .cmp = migrate_type_cmp, 1619 }; 1620 1621 static int gfp_flags_cmp(void *a, void *b) 1622 { 1623 struct page_stat *l = a; 1624 struct page_stat *r = b; 1625 1626 /* for internal use to find free'd page */ 1627 if (l->gfp_flags == -1U) 1628 return 0; 1629 1630 if (l->gfp_flags < r->gfp_flags) 1631 return -1; 1632 else if (l->gfp_flags > r->gfp_flags) 1633 return 1; 1634 return 0; 1635 } 1636 1637 static struct sort_dimension gfp_flags_sort_dimension = { 1638 .name = "gfp", 1639 .cmp = gfp_flags_cmp, 1640 }; 1641 1642 static struct sort_dimension *slab_sorts[] = { 1643 &ptr_sort_dimension, 1644 &callsite_sort_dimension, 1645 &hit_sort_dimension, 1646 &bytes_sort_dimension, 1647 &frag_sort_dimension, 1648 &pingpong_sort_dimension, 1649 }; 1650 1651 static struct sort_dimension *page_sorts[] = { 1652 &page_sort_dimension, 1653 &page_callsite_sort_dimension, 1654 &page_hit_sort_dimension, 1655 &page_bytes_sort_dimension, 1656 &page_order_sort_dimension, 1657 &migrate_type_sort_dimension, 1658 &gfp_flags_sort_dimension, 1659 }; 1660 1661 static int slab_sort_dimension__add(const char *tok, struct list_head *list) 1662 { 1663 struct sort_dimension *sort; 1664 int i; 1665 1666 for (i = 0; i < (int)ARRAY_SIZE(slab_sorts); i++) { 1667 if (!strcmp(slab_sorts[i]->name, tok)) { 1668 sort = memdup(slab_sorts[i], sizeof(*slab_sorts[i])); 1669 if (!sort) { 1670 pr_err("%s: memdup failed\n", __func__); 1671 return -1; 1672 } 1673 list_add_tail(&sort->list, list); 1674 return 0; 1675 } 1676 } 1677 1678 return -1; 1679 } 1680 1681 static int page_sort_dimension__add(const char *tok, struct list_head *list) 1682 { 1683 struct sort_dimension *sort; 1684 int i; 1685 1686 for (i = 0; i < (int)ARRAY_SIZE(page_sorts); i++) { 1687 if (!strcmp(page_sorts[i]->name, tok)) { 1688 sort = memdup(page_sorts[i], sizeof(*page_sorts[i])); 1689 if (!sort) { 1690 pr_err("%s: memdup failed\n", __func__); 1691 return -1; 1692 } 1693 list_add_tail(&sort->list, list); 1694 return 0; 1695 } 1696 } 1697 1698 return -1; 1699 } 1700 1701 static int setup_slab_sorting(struct list_head *sort_list, const char *arg) 1702 { 1703 char *tok; 1704 char *str = strdup(arg); 1705 char *pos = str; 1706 1707 if (!str) { 1708 pr_err("%s: strdup failed\n", __func__); 1709 return -1; 1710 } 1711 1712 while (true) { 1713 tok = strsep(&pos, ","); 1714 if (!tok) 1715 break; 1716 if (slab_sort_dimension__add(tok, sort_list) < 0) { 1717 pr_err("Unknown slab --sort key: '%s'", tok); 1718 free(str); 1719 return -1; 1720 } 1721 } 1722 1723 free(str); 1724 return 0; 1725 } 1726 1727 static int setup_page_sorting(struct list_head *sort_list, const char *arg) 1728 { 1729 char *tok; 1730 char *str = strdup(arg); 1731 char *pos = str; 1732 1733 if (!str) { 1734 pr_err("%s: strdup failed\n", __func__); 1735 return -1; 1736 } 1737 1738 while (true) { 1739 tok = strsep(&pos, ","); 1740 if (!tok) 1741 break; 1742 if (page_sort_dimension__add(tok, sort_list) < 0) { 1743 pr_err("Unknown page --sort key: '%s'", tok); 1744 free(str); 1745 return -1; 1746 } 1747 } 1748 1749 free(str); 1750 return 0; 1751 } 1752 1753 static int parse_sort_opt(const struct option *opt __maybe_unused, 1754 const char *arg, int unset __maybe_unused) 1755 { 1756 if (!arg) 1757 return -1; 1758 1759 if (kmem_page > kmem_slab || 1760 (kmem_page == 0 && kmem_slab == 0 && kmem_default == KMEM_PAGE)) { 1761 if (caller_flag > alloc_flag) 1762 return setup_page_sorting(&page_caller_sort, arg); 1763 else 1764 return setup_page_sorting(&page_alloc_sort, arg); 1765 } else { 1766 if (caller_flag > alloc_flag) 1767 return setup_slab_sorting(&slab_caller_sort, arg); 1768 else 1769 return setup_slab_sorting(&slab_alloc_sort, arg); 1770 } 1771 1772 return 0; 1773 } 1774 1775 static int parse_caller_opt(const struct option *opt __maybe_unused, 1776 const char *arg __maybe_unused, 1777 int unset __maybe_unused) 1778 { 1779 caller_flag = (alloc_flag + 1); 1780 return 0; 1781 } 1782 1783 static int parse_alloc_opt(const struct option *opt __maybe_unused, 1784 const char *arg __maybe_unused, 1785 int unset __maybe_unused) 1786 { 1787 alloc_flag = (caller_flag + 1); 1788 return 0; 1789 } 1790 1791 static int parse_slab_opt(const struct option *opt __maybe_unused, 1792 const char *arg __maybe_unused, 1793 int unset __maybe_unused) 1794 { 1795 kmem_slab = (kmem_page + 1); 1796 return 0; 1797 } 1798 1799 static int parse_page_opt(const struct option *opt __maybe_unused, 1800 const char *arg __maybe_unused, 1801 int unset __maybe_unused) 1802 { 1803 kmem_page = (kmem_slab + 1); 1804 return 0; 1805 } 1806 1807 static int parse_line_opt(const struct option *opt __maybe_unused, 1808 const char *arg, int unset __maybe_unused) 1809 { 1810 int lines; 1811 1812 if (!arg) 1813 return -1; 1814 1815 lines = strtoul(arg, NULL, 10); 1816 1817 if (caller_flag > alloc_flag) 1818 caller_lines = lines; 1819 else 1820 alloc_lines = lines; 1821 1822 return 0; 1823 } 1824 1825 static int __cmd_record(int argc, const char **argv) 1826 { 1827 const char * const record_args[] = { 1828 "record", "-a", "-R", "-c", "1", 1829 }; 1830 const char * const slab_events[] = { 1831 "-e", "kmem:kmalloc", 1832 "-e", "kmem:kmalloc_node", 1833 "-e", "kmem:kfree", 1834 "-e", "kmem:kmem_cache_alloc", 1835 "-e", "kmem:kmem_cache_alloc_node", 1836 "-e", "kmem:kmem_cache_free", 1837 }; 1838 const char * const page_events[] = { 1839 "-e", "kmem:mm_page_alloc", 1840 "-e", "kmem:mm_page_free", 1841 }; 1842 unsigned int rec_argc, i, j; 1843 const char **rec_argv; 1844 1845 rec_argc = ARRAY_SIZE(record_args) + argc - 1; 1846 if (kmem_slab) 1847 rec_argc += ARRAY_SIZE(slab_events); 1848 if (kmem_page) 1849 rec_argc += ARRAY_SIZE(page_events) + 1; /* for -g */ 1850 1851 rec_argv = calloc(rec_argc + 1, sizeof(char *)); 1852 1853 if (rec_argv == NULL) 1854 return -ENOMEM; 1855 1856 for (i = 0; i < ARRAY_SIZE(record_args); i++) 1857 rec_argv[i] = strdup(record_args[i]); 1858 1859 if (kmem_slab) { 1860 for (j = 0; j < ARRAY_SIZE(slab_events); j++, i++) 1861 rec_argv[i] = strdup(slab_events[j]); 1862 } 1863 if (kmem_page) { 1864 rec_argv[i++] = strdup("-g"); 1865 1866 for (j = 0; j < ARRAY_SIZE(page_events); j++, i++) 1867 rec_argv[i] = strdup(page_events[j]); 1868 } 1869 1870 for (j = 1; j < (unsigned int)argc; j++, i++) 1871 rec_argv[i] = argv[j]; 1872 1873 return cmd_record(i, rec_argv); 1874 } 1875 1876 static int kmem_config(const char *var, const char *value, void *cb __maybe_unused) 1877 { 1878 if (!strcmp(var, "kmem.default")) { 1879 if (!strcmp(value, "slab")) 1880 kmem_default = KMEM_SLAB; 1881 else if (!strcmp(value, "page")) 1882 kmem_default = KMEM_PAGE; 1883 else 1884 pr_err("invalid default value ('slab' or 'page' required): %s\n", 1885 value); 1886 return 0; 1887 } 1888 1889 return 0; 1890 } 1891 1892 int cmd_kmem(int argc, const char **argv) 1893 { 1894 const char * const default_slab_sort = "frag,hit,bytes"; 1895 const char * const default_page_sort = "bytes,hit"; 1896 struct perf_data data = { 1897 .mode = PERF_DATA_MODE_READ, 1898 }; 1899 const struct option kmem_options[] = { 1900 OPT_STRING('i', "input", &input_name, "file", "input file name"), 1901 OPT_INCR('v', "verbose", &verbose, 1902 "be more verbose (show symbol address, etc)"), 1903 OPT_CALLBACK_NOOPT(0, "caller", NULL, NULL, 1904 "show per-callsite statistics", parse_caller_opt), 1905 OPT_CALLBACK_NOOPT(0, "alloc", NULL, NULL, 1906 "show per-allocation statistics", parse_alloc_opt), 1907 OPT_CALLBACK('s', "sort", NULL, "key[,key2...]", 1908 "sort by keys: ptr, callsite, bytes, hit, pingpong, frag, " 1909 "page, order, migtype, gfp", parse_sort_opt), 1910 OPT_CALLBACK('l', "line", NULL, "num", "show n lines", parse_line_opt), 1911 OPT_BOOLEAN(0, "raw-ip", &raw_ip, "show raw ip instead of symbol"), 1912 OPT_BOOLEAN('f', "force", &data.force, "don't complain, do it"), 1913 OPT_CALLBACK_NOOPT(0, "slab", NULL, NULL, "Analyze slab allocator", 1914 parse_slab_opt), 1915 OPT_CALLBACK_NOOPT(0, "page", NULL, NULL, "Analyze page allocator", 1916 parse_page_opt), 1917 OPT_BOOLEAN(0, "live", &live_page, "Show live page stat"), 1918 OPT_STRING(0, "time", &time_str, "str", 1919 "Time span of interest (start,stop)"), 1920 OPT_END() 1921 }; 1922 const char *const kmem_subcommands[] = { "record", "stat", NULL }; 1923 const char *kmem_usage[] = { 1924 NULL, 1925 NULL 1926 }; 1927 struct perf_session *session; 1928 static const char errmsg[] = "No %s allocation events found. Have you run 'perf kmem record --%s'?\n"; 1929 int ret = perf_config(kmem_config, NULL); 1930 1931 if (ret) 1932 return ret; 1933 1934 argc = parse_options_subcommand(argc, argv, kmem_options, 1935 kmem_subcommands, kmem_usage, 0); 1936 1937 if (!argc) 1938 usage_with_options(kmem_usage, kmem_options); 1939 1940 if (kmem_slab == 0 && kmem_page == 0) { 1941 if (kmem_default == KMEM_SLAB) 1942 kmem_slab = 1; 1943 else 1944 kmem_page = 1; 1945 } 1946 1947 if (!strncmp(argv[0], "rec", 3)) { 1948 symbol__init(NULL); 1949 return __cmd_record(argc, argv); 1950 } 1951 1952 data.path = input_name; 1953 1954 kmem_session = session = perf_session__new(&data, false, &perf_kmem); 1955 if (session == NULL) 1956 return -1; 1957 1958 ret = -1; 1959 1960 if (kmem_slab) { 1961 if (!perf_evlist__find_tracepoint_by_name(session->evlist, 1962 "kmem:kmalloc")) { 1963 pr_err(errmsg, "slab", "slab"); 1964 goto out_delete; 1965 } 1966 } 1967 1968 if (kmem_page) { 1969 struct perf_evsel *evsel; 1970 1971 evsel = perf_evlist__find_tracepoint_by_name(session->evlist, 1972 "kmem:mm_page_alloc"); 1973 if (evsel == NULL) { 1974 pr_err(errmsg, "page", "page"); 1975 goto out_delete; 1976 } 1977 1978 kmem_page_size = tep_get_page_size(evsel->tp_format->pevent); 1979 symbol_conf.use_callchain = true; 1980 } 1981 1982 symbol__init(&session->header.env); 1983 1984 if (perf_time__parse_str(&ptime, time_str) != 0) { 1985 pr_err("Invalid time string\n"); 1986 ret = -EINVAL; 1987 goto out_delete; 1988 } 1989 1990 if (!strcmp(argv[0], "stat")) { 1991 setlocale(LC_ALL, ""); 1992 1993 if (cpu__setup_cpunode_map()) 1994 goto out_delete; 1995 1996 if (list_empty(&slab_caller_sort)) 1997 setup_slab_sorting(&slab_caller_sort, default_slab_sort); 1998 if (list_empty(&slab_alloc_sort)) 1999 setup_slab_sorting(&slab_alloc_sort, default_slab_sort); 2000 if (list_empty(&page_caller_sort)) 2001 setup_page_sorting(&page_caller_sort, default_page_sort); 2002 if (list_empty(&page_alloc_sort)) 2003 setup_page_sorting(&page_alloc_sort, default_page_sort); 2004 2005 if (kmem_page) { 2006 setup_page_sorting(&page_alloc_sort_input, 2007 "page,order,migtype,gfp"); 2008 setup_page_sorting(&page_caller_sort_input, 2009 "callsite,order,migtype,gfp"); 2010 } 2011 ret = __cmd_kmem(session); 2012 } else 2013 usage_with_options(kmem_usage, kmem_options); 2014 2015 out_delete: 2016 perf_session__delete(session); 2017 2018 return ret; 2019 } 2020 2021