1 // SPDX-License-Identifier: GPL-2.0 2 #include "builtin.h" 3 #include "perf.h" 4 5 #include "util/dso.h" 6 #include "util/evlist.h" 7 #include "util/evsel.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 #include <linux/err.h> 18 19 #include <subcmd/pager.h> 20 #include <subcmd/parse-options.h> 21 #include "util/trace-event.h" 22 #include "util/data.h" 23 #include "util/cpumap.h" 24 25 #include "util/debug.h" 26 #include "util/string2.h" 27 28 #include <linux/kernel.h> 29 #include <linux/rbtree.h> 30 #include <linux/string.h> 31 #include <linux/zalloc.h> 32 #include <errno.h> 33 #include <inttypes.h> 34 #include <locale.h> 35 #include <regex.h> 36 37 #include <linux/ctype.h> 38 39 static int kmem_slab; 40 static int kmem_page; 41 42 static long kmem_page_size; 43 static enum { 44 KMEM_SLAB, 45 KMEM_PAGE, 46 } kmem_default = KMEM_SLAB; /* for backward compatibility */ 47 48 struct alloc_stat; 49 typedef int (*sort_fn_t)(void *, void *); 50 51 static int alloc_flag; 52 static int caller_flag; 53 54 static int alloc_lines = -1; 55 static int caller_lines = -1; 56 57 static bool raw_ip; 58 59 struct alloc_stat { 60 u64 call_site; 61 u64 ptr; 62 u64 bytes_req; 63 u64 bytes_alloc; 64 u64 last_alloc; 65 u32 hit; 66 u32 pingpong; 67 68 short alloc_cpu; 69 70 struct rb_node node; 71 }; 72 73 static struct rb_root root_alloc_stat; 74 static struct rb_root root_alloc_sorted; 75 static struct rb_root root_caller_stat; 76 static struct rb_root root_caller_sorted; 77 78 static unsigned long total_requested, total_allocated, total_freed; 79 static unsigned long nr_allocs, nr_cross_allocs; 80 81 /* filters for controlling start and stop of time of analysis */ 82 static struct perf_time_interval ptime; 83 const char *time_str; 84 85 static int insert_alloc_stat(unsigned long call_site, unsigned long ptr, 86 int bytes_req, int bytes_alloc, int cpu) 87 { 88 struct rb_node **node = &root_alloc_stat.rb_node; 89 struct rb_node *parent = NULL; 90 struct alloc_stat *data = NULL; 91 92 while (*node) { 93 parent = *node; 94 data = rb_entry(*node, struct alloc_stat, node); 95 96 if (ptr > data->ptr) 97 node = &(*node)->rb_right; 98 else if (ptr < data->ptr) 99 node = &(*node)->rb_left; 100 else 101 break; 102 } 103 104 if (data && data->ptr == ptr) { 105 data->hit++; 106 data->bytes_req += bytes_req; 107 data->bytes_alloc += bytes_alloc; 108 } else { 109 data = malloc(sizeof(*data)); 110 if (!data) { 111 pr_err("%s: malloc failed\n", __func__); 112 return -1; 113 } 114 data->ptr = ptr; 115 data->pingpong = 0; 116 data->hit = 1; 117 data->bytes_req = bytes_req; 118 data->bytes_alloc = bytes_alloc; 119 120 rb_link_node(&data->node, parent, node); 121 rb_insert_color(&data->node, &root_alloc_stat); 122 } 123 data->call_site = call_site; 124 data->alloc_cpu = cpu; 125 data->last_alloc = bytes_alloc; 126 127 return 0; 128 } 129 130 static int insert_caller_stat(unsigned long call_site, 131 int bytes_req, int bytes_alloc) 132 { 133 struct rb_node **node = &root_caller_stat.rb_node; 134 struct rb_node *parent = NULL; 135 struct alloc_stat *data = NULL; 136 137 while (*node) { 138 parent = *node; 139 data = rb_entry(*node, struct alloc_stat, node); 140 141 if (call_site > data->call_site) 142 node = &(*node)->rb_right; 143 else if (call_site < data->call_site) 144 node = &(*node)->rb_left; 145 else 146 break; 147 } 148 149 if (data && data->call_site == call_site) { 150 data->hit++; 151 data->bytes_req += bytes_req; 152 data->bytes_alloc += bytes_alloc; 153 } else { 154 data = malloc(sizeof(*data)); 155 if (!data) { 156 pr_err("%s: malloc failed\n", __func__); 157 return -1; 158 } 159 data->call_site = call_site; 160 data->pingpong = 0; 161 data->hit = 1; 162 data->bytes_req = bytes_req; 163 data->bytes_alloc = bytes_alloc; 164 165 rb_link_node(&data->node, parent, node); 166 rb_insert_color(&data->node, &root_caller_stat); 167 } 168 169 return 0; 170 } 171 172 static int evsel__process_alloc_event(struct evsel *evsel, struct perf_sample *sample) 173 { 174 unsigned long ptr = evsel__intval(evsel, sample, "ptr"), 175 call_site = evsel__intval(evsel, sample, "call_site"); 176 int bytes_req = evsel__intval(evsel, sample, "bytes_req"), 177 bytes_alloc = evsel__intval(evsel, sample, "bytes_alloc"); 178 179 if (insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, sample->cpu) || 180 insert_caller_stat(call_site, bytes_req, bytes_alloc)) 181 return -1; 182 183 total_requested += bytes_req; 184 total_allocated += bytes_alloc; 185 186 nr_allocs++; 187 return 0; 188 } 189 190 static int evsel__process_alloc_node_event(struct evsel *evsel, struct perf_sample *sample) 191 { 192 int ret = evsel__process_alloc_event(evsel, sample); 193 194 if (!ret) { 195 int node1 = cpu__get_node(sample->cpu), 196 node2 = evsel__intval(evsel, sample, "node"); 197 198 if (node1 != node2) 199 nr_cross_allocs++; 200 } 201 202 return ret; 203 } 204 205 static int ptr_cmp(void *, void *); 206 static int slab_callsite_cmp(void *, void *); 207 208 static struct alloc_stat *search_alloc_stat(unsigned long ptr, 209 unsigned long call_site, 210 struct rb_root *root, 211 sort_fn_t sort_fn) 212 { 213 struct rb_node *node = root->rb_node; 214 struct alloc_stat key = { .ptr = ptr, .call_site = call_site }; 215 216 while (node) { 217 struct alloc_stat *data; 218 int cmp; 219 220 data = rb_entry(node, struct alloc_stat, node); 221 222 cmp = sort_fn(&key, data); 223 if (cmp < 0) 224 node = node->rb_left; 225 else if (cmp > 0) 226 node = node->rb_right; 227 else 228 return data; 229 } 230 return NULL; 231 } 232 233 static int evsel__process_free_event(struct evsel *evsel, struct perf_sample *sample) 234 { 235 unsigned long ptr = evsel__intval(evsel, sample, "ptr"); 236 struct alloc_stat *s_alloc, *s_caller; 237 238 s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp); 239 if (!s_alloc) 240 return 0; 241 242 total_freed += s_alloc->last_alloc; 243 244 if ((short)sample->cpu != s_alloc->alloc_cpu) { 245 s_alloc->pingpong++; 246 247 s_caller = search_alloc_stat(0, s_alloc->call_site, 248 &root_caller_stat, 249 slab_callsite_cmp); 250 if (!s_caller) 251 return -1; 252 s_caller->pingpong++; 253 } 254 s_alloc->alloc_cpu = -1; 255 256 return 0; 257 } 258 259 static u64 total_page_alloc_bytes; 260 static u64 total_page_free_bytes; 261 static u64 total_page_nomatch_bytes; 262 static u64 total_page_fail_bytes; 263 static unsigned long nr_page_allocs; 264 static unsigned long nr_page_frees; 265 static unsigned long nr_page_fails; 266 static unsigned long nr_page_nomatch; 267 268 static bool use_pfn; 269 static bool live_page; 270 static struct perf_session *kmem_session; 271 272 #define MAX_MIGRATE_TYPES 6 273 #define MAX_PAGE_ORDER 11 274 275 static int order_stats[MAX_PAGE_ORDER][MAX_MIGRATE_TYPES]; 276 277 struct page_stat { 278 struct rb_node node; 279 u64 page; 280 u64 callsite; 281 int order; 282 unsigned gfp_flags; 283 unsigned migrate_type; 284 u64 alloc_bytes; 285 u64 free_bytes; 286 int nr_alloc; 287 int nr_free; 288 }; 289 290 static struct rb_root page_live_tree; 291 static struct rb_root page_alloc_tree; 292 static struct rb_root page_alloc_sorted; 293 static struct rb_root page_caller_tree; 294 static struct rb_root page_caller_sorted; 295 296 struct alloc_func { 297 u64 start; 298 u64 end; 299 char *name; 300 }; 301 302 static int nr_alloc_funcs; 303 static struct alloc_func *alloc_func_list; 304 305 static int funcmp(const void *a, const void *b) 306 { 307 const struct alloc_func *fa = a; 308 const struct alloc_func *fb = b; 309 310 if (fa->start > fb->start) 311 return 1; 312 else 313 return -1; 314 } 315 316 static int callcmp(const void *a, const void *b) 317 { 318 const struct alloc_func *fa = a; 319 const struct alloc_func *fb = b; 320 321 if (fb->start <= fa->start && fa->end < fb->end) 322 return 0; 323 324 if (fa->start > fb->start) 325 return 1; 326 else 327 return -1; 328 } 329 330 static int build_alloc_func_list(void) 331 { 332 int ret; 333 struct map *kernel_map; 334 struct symbol *sym; 335 struct rb_node *node; 336 struct alloc_func *func; 337 struct machine *machine = &kmem_session->machines.host; 338 regex_t alloc_func_regex; 339 static const char pattern[] = "^_?_?(alloc|get_free|get_zeroed)_pages?"; 340 341 ret = regcomp(&alloc_func_regex, pattern, REG_EXTENDED); 342 if (ret) { 343 char err[BUFSIZ]; 344 345 regerror(ret, &alloc_func_regex, err, sizeof(err)); 346 pr_err("Invalid regex: %s\n%s", pattern, err); 347 return -EINVAL; 348 } 349 350 kernel_map = machine__kernel_map(machine); 351 if (map__load(kernel_map) < 0) { 352 pr_err("cannot load kernel map\n"); 353 return -ENOENT; 354 } 355 356 map__for_each_symbol(kernel_map, sym, node) { 357 if (regexec(&alloc_func_regex, sym->name, 0, NULL, 0)) 358 continue; 359 360 func = realloc(alloc_func_list, 361 (nr_alloc_funcs + 1) * sizeof(*func)); 362 if (func == NULL) 363 return -ENOMEM; 364 365 pr_debug("alloc func: %s\n", sym->name); 366 func[nr_alloc_funcs].start = sym->start; 367 func[nr_alloc_funcs].end = sym->end; 368 func[nr_alloc_funcs].name = sym->name; 369 370 alloc_func_list = func; 371 nr_alloc_funcs++; 372 } 373 374 qsort(alloc_func_list, nr_alloc_funcs, sizeof(*func), funcmp); 375 376 regfree(&alloc_func_regex); 377 return 0; 378 } 379 380 /* 381 * Find first non-memory allocation function from callchain. 382 * The allocation functions are in the 'alloc_func_list'. 383 */ 384 static u64 find_callsite(struct evsel *evsel, struct perf_sample *sample) 385 { 386 struct addr_location al; 387 struct machine *machine = &kmem_session->machines.host; 388 struct callchain_cursor_node *node; 389 390 if (alloc_func_list == NULL) { 391 if (build_alloc_func_list() < 0) 392 goto out; 393 } 394 395 al.thread = machine__findnew_thread(machine, sample->pid, sample->tid); 396 sample__resolve_callchain(sample, &callchain_cursor, NULL, evsel, &al, 16); 397 398 callchain_cursor_commit(&callchain_cursor); 399 while (true) { 400 struct alloc_func key, *caller; 401 u64 addr; 402 403 node = callchain_cursor_current(&callchain_cursor); 404 if (node == NULL) 405 break; 406 407 key.start = key.end = node->ip; 408 caller = bsearch(&key, alloc_func_list, nr_alloc_funcs, 409 sizeof(key), callcmp); 410 if (!caller) { 411 /* found */ 412 if (node->ms.map) 413 addr = map__unmap_ip(node->ms.map, node->ip); 414 else 415 addr = node->ip; 416 417 return addr; 418 } else 419 pr_debug3("skipping alloc function: %s\n", caller->name); 420 421 callchain_cursor_advance(&callchain_cursor); 422 } 423 424 out: 425 pr_debug2("unknown callsite: %"PRIx64 "\n", sample->ip); 426 return sample->ip; 427 } 428 429 struct sort_dimension { 430 const char name[20]; 431 sort_fn_t cmp; 432 struct list_head list; 433 }; 434 435 static LIST_HEAD(page_alloc_sort_input); 436 static LIST_HEAD(page_caller_sort_input); 437 438 static struct page_stat * 439 __page_stat__findnew_page(struct page_stat *pstat, bool create) 440 { 441 struct rb_node **node = &page_live_tree.rb_node; 442 struct rb_node *parent = NULL; 443 struct page_stat *data; 444 445 while (*node) { 446 s64 cmp; 447 448 parent = *node; 449 data = rb_entry(*node, struct page_stat, node); 450 451 cmp = data->page - pstat->page; 452 if (cmp < 0) 453 node = &parent->rb_left; 454 else if (cmp > 0) 455 node = &parent->rb_right; 456 else 457 return data; 458 } 459 460 if (!create) 461 return NULL; 462 463 data = zalloc(sizeof(*data)); 464 if (data != NULL) { 465 data->page = pstat->page; 466 data->order = pstat->order; 467 data->gfp_flags = pstat->gfp_flags; 468 data->migrate_type = pstat->migrate_type; 469 470 rb_link_node(&data->node, parent, node); 471 rb_insert_color(&data->node, &page_live_tree); 472 } 473 474 return data; 475 } 476 477 static struct page_stat *page_stat__find_page(struct page_stat *pstat) 478 { 479 return __page_stat__findnew_page(pstat, false); 480 } 481 482 static struct page_stat *page_stat__findnew_page(struct page_stat *pstat) 483 { 484 return __page_stat__findnew_page(pstat, true); 485 } 486 487 static struct page_stat * 488 __page_stat__findnew_alloc(struct page_stat *pstat, bool create) 489 { 490 struct rb_node **node = &page_alloc_tree.rb_node; 491 struct rb_node *parent = NULL; 492 struct page_stat *data; 493 struct sort_dimension *sort; 494 495 while (*node) { 496 int cmp = 0; 497 498 parent = *node; 499 data = rb_entry(*node, struct page_stat, node); 500 501 list_for_each_entry(sort, &page_alloc_sort_input, list) { 502 cmp = sort->cmp(pstat, data); 503 if (cmp) 504 break; 505 } 506 507 if (cmp < 0) 508 node = &parent->rb_left; 509 else if (cmp > 0) 510 node = &parent->rb_right; 511 else 512 return data; 513 } 514 515 if (!create) 516 return NULL; 517 518 data = zalloc(sizeof(*data)); 519 if (data != NULL) { 520 data->page = pstat->page; 521 data->order = pstat->order; 522 data->gfp_flags = pstat->gfp_flags; 523 data->migrate_type = pstat->migrate_type; 524 525 rb_link_node(&data->node, parent, node); 526 rb_insert_color(&data->node, &page_alloc_tree); 527 } 528 529 return data; 530 } 531 532 static struct page_stat *page_stat__find_alloc(struct page_stat *pstat) 533 { 534 return __page_stat__findnew_alloc(pstat, false); 535 } 536 537 static struct page_stat *page_stat__findnew_alloc(struct page_stat *pstat) 538 { 539 return __page_stat__findnew_alloc(pstat, true); 540 } 541 542 static struct page_stat * 543 __page_stat__findnew_caller(struct page_stat *pstat, bool create) 544 { 545 struct rb_node **node = &page_caller_tree.rb_node; 546 struct rb_node *parent = NULL; 547 struct page_stat *data; 548 struct sort_dimension *sort; 549 550 while (*node) { 551 int cmp = 0; 552 553 parent = *node; 554 data = rb_entry(*node, struct page_stat, node); 555 556 list_for_each_entry(sort, &page_caller_sort_input, list) { 557 cmp = sort->cmp(pstat, data); 558 if (cmp) 559 break; 560 } 561 562 if (cmp < 0) 563 node = &parent->rb_left; 564 else if (cmp > 0) 565 node = &parent->rb_right; 566 else 567 return data; 568 } 569 570 if (!create) 571 return NULL; 572 573 data = zalloc(sizeof(*data)); 574 if (data != NULL) { 575 data->callsite = pstat->callsite; 576 data->order = pstat->order; 577 data->gfp_flags = pstat->gfp_flags; 578 data->migrate_type = pstat->migrate_type; 579 580 rb_link_node(&data->node, parent, node); 581 rb_insert_color(&data->node, &page_caller_tree); 582 } 583 584 return data; 585 } 586 587 static struct page_stat *page_stat__find_caller(struct page_stat *pstat) 588 { 589 return __page_stat__findnew_caller(pstat, false); 590 } 591 592 static struct page_stat *page_stat__findnew_caller(struct page_stat *pstat) 593 { 594 return __page_stat__findnew_caller(pstat, true); 595 } 596 597 static bool valid_page(u64 pfn_or_page) 598 { 599 if (use_pfn && pfn_or_page == -1UL) 600 return false; 601 if (!use_pfn && pfn_or_page == 0) 602 return false; 603 return true; 604 } 605 606 struct gfp_flag { 607 unsigned int flags; 608 char *compact_str; 609 char *human_readable; 610 }; 611 612 static struct gfp_flag *gfps; 613 static int nr_gfps; 614 615 static int gfpcmp(const void *a, const void *b) 616 { 617 const struct gfp_flag *fa = a; 618 const struct gfp_flag *fb = b; 619 620 return fa->flags - fb->flags; 621 } 622 623 /* see include/trace/events/mmflags.h */ 624 static const struct { 625 const char *original; 626 const char *compact; 627 } gfp_compact_table[] = { 628 { "GFP_TRANSHUGE", "THP" }, 629 { "GFP_TRANSHUGE_LIGHT", "THL" }, 630 { "GFP_HIGHUSER_MOVABLE", "HUM" }, 631 { "GFP_HIGHUSER", "HU" }, 632 { "GFP_USER", "U" }, 633 { "GFP_KERNEL_ACCOUNT", "KAC" }, 634 { "GFP_KERNEL", "K" }, 635 { "GFP_NOFS", "NF" }, 636 { "GFP_ATOMIC", "A" }, 637 { "GFP_NOIO", "NI" }, 638 { "GFP_NOWAIT", "NW" }, 639 { "GFP_DMA", "D" }, 640 { "__GFP_HIGHMEM", "HM" }, 641 { "GFP_DMA32", "D32" }, 642 { "__GFP_HIGH", "H" }, 643 { "__GFP_ATOMIC", "_A" }, 644 { "__GFP_IO", "I" }, 645 { "__GFP_FS", "F" }, 646 { "__GFP_NOWARN", "NWR" }, 647 { "__GFP_RETRY_MAYFAIL", "R" }, 648 { "__GFP_NOFAIL", "NF" }, 649 { "__GFP_NORETRY", "NR" }, 650 { "__GFP_COMP", "C" }, 651 { "__GFP_ZERO", "Z" }, 652 { "__GFP_NOMEMALLOC", "NMA" }, 653 { "__GFP_MEMALLOC", "MA" }, 654 { "__GFP_HARDWALL", "HW" }, 655 { "__GFP_THISNODE", "TN" }, 656 { "__GFP_RECLAIMABLE", "RC" }, 657 { "__GFP_MOVABLE", "M" }, 658 { "__GFP_ACCOUNT", "AC" }, 659 { "__GFP_WRITE", "WR" }, 660 { "__GFP_RECLAIM", "R" }, 661 { "__GFP_DIRECT_RECLAIM", "DR" }, 662 { "__GFP_KSWAPD_RECLAIM", "KR" }, 663 }; 664 665 static size_t max_gfp_len; 666 667 static char *compact_gfp_flags(char *gfp_flags) 668 { 669 char *orig_flags = strdup(gfp_flags); 670 char *new_flags = NULL; 671 char *str, *pos = NULL; 672 size_t len = 0; 673 674 if (orig_flags == NULL) 675 return NULL; 676 677 str = strtok_r(orig_flags, "|", &pos); 678 while (str) { 679 size_t i; 680 char *new; 681 const char *cpt; 682 683 for (i = 0; i < ARRAY_SIZE(gfp_compact_table); i++) { 684 if (strcmp(gfp_compact_table[i].original, str)) 685 continue; 686 687 cpt = gfp_compact_table[i].compact; 688 new = realloc(new_flags, len + strlen(cpt) + 2); 689 if (new == NULL) { 690 free(new_flags); 691 free(orig_flags); 692 return NULL; 693 } 694 695 new_flags = new; 696 697 if (!len) { 698 strcpy(new_flags, cpt); 699 } else { 700 strcat(new_flags, "|"); 701 strcat(new_flags, cpt); 702 len++; 703 } 704 705 len += strlen(cpt); 706 } 707 708 str = strtok_r(NULL, "|", &pos); 709 } 710 711 if (max_gfp_len < len) 712 max_gfp_len = len; 713 714 free(orig_flags); 715 return new_flags; 716 } 717 718 static char *compact_gfp_string(unsigned long gfp_flags) 719 { 720 struct gfp_flag key = { 721 .flags = gfp_flags, 722 }; 723 struct gfp_flag *gfp; 724 725 gfp = bsearch(&key, gfps, nr_gfps, sizeof(*gfps), gfpcmp); 726 if (gfp) 727 return gfp->compact_str; 728 729 return NULL; 730 } 731 732 static int parse_gfp_flags(struct evsel *evsel, struct perf_sample *sample, 733 unsigned int gfp_flags) 734 { 735 struct tep_record record = { 736 .cpu = sample->cpu, 737 .data = sample->raw_data, 738 .size = sample->raw_size, 739 }; 740 struct trace_seq seq; 741 char *str, *pos = NULL; 742 743 if (nr_gfps) { 744 struct gfp_flag key = { 745 .flags = gfp_flags, 746 }; 747 748 if (bsearch(&key, gfps, nr_gfps, sizeof(*gfps), gfpcmp)) 749 return 0; 750 } 751 752 trace_seq_init(&seq); 753 tep_print_event(evsel->tp_format->tep, 754 &seq, &record, "%s", TEP_PRINT_INFO); 755 756 str = strtok_r(seq.buffer, " ", &pos); 757 while (str) { 758 if (!strncmp(str, "gfp_flags=", 10)) { 759 struct gfp_flag *new; 760 761 new = realloc(gfps, (nr_gfps + 1) * sizeof(*gfps)); 762 if (new == NULL) 763 return -ENOMEM; 764 765 gfps = new; 766 new += nr_gfps++; 767 768 new->flags = gfp_flags; 769 new->human_readable = strdup(str + 10); 770 new->compact_str = compact_gfp_flags(str + 10); 771 if (!new->human_readable || !new->compact_str) 772 return -ENOMEM; 773 774 qsort(gfps, nr_gfps, sizeof(*gfps), gfpcmp); 775 } 776 777 str = strtok_r(NULL, " ", &pos); 778 } 779 780 trace_seq_destroy(&seq); 781 return 0; 782 } 783 784 static int evsel__process_page_alloc_event(struct evsel *evsel, struct perf_sample *sample) 785 { 786 u64 page; 787 unsigned int order = evsel__intval(evsel, sample, "order"); 788 unsigned int gfp_flags = evsel__intval(evsel, sample, "gfp_flags"); 789 unsigned int migrate_type = evsel__intval(evsel, sample, 790 "migratetype"); 791 u64 bytes = kmem_page_size << order; 792 u64 callsite; 793 struct page_stat *pstat; 794 struct page_stat this = { 795 .order = order, 796 .gfp_flags = gfp_flags, 797 .migrate_type = migrate_type, 798 }; 799 800 if (use_pfn) 801 page = evsel__intval(evsel, sample, "pfn"); 802 else 803 page = evsel__intval(evsel, sample, "page"); 804 805 nr_page_allocs++; 806 total_page_alloc_bytes += bytes; 807 808 if (!valid_page(page)) { 809 nr_page_fails++; 810 total_page_fail_bytes += bytes; 811 812 return 0; 813 } 814 815 if (parse_gfp_flags(evsel, sample, gfp_flags) < 0) 816 return -1; 817 818 callsite = find_callsite(evsel, sample); 819 820 /* 821 * This is to find the current page (with correct gfp flags and 822 * migrate type) at free event. 823 */ 824 this.page = page; 825 pstat = page_stat__findnew_page(&this); 826 if (pstat == NULL) 827 return -ENOMEM; 828 829 pstat->nr_alloc++; 830 pstat->alloc_bytes += bytes; 831 pstat->callsite = callsite; 832 833 if (!live_page) { 834 pstat = page_stat__findnew_alloc(&this); 835 if (pstat == NULL) 836 return -ENOMEM; 837 838 pstat->nr_alloc++; 839 pstat->alloc_bytes += bytes; 840 pstat->callsite = callsite; 841 } 842 843 this.callsite = callsite; 844 pstat = page_stat__findnew_caller(&this); 845 if (pstat == NULL) 846 return -ENOMEM; 847 848 pstat->nr_alloc++; 849 pstat->alloc_bytes += bytes; 850 851 order_stats[order][migrate_type]++; 852 853 return 0; 854 } 855 856 static int evsel__process_page_free_event(struct evsel *evsel, struct perf_sample *sample) 857 { 858 u64 page; 859 unsigned int order = evsel__intval(evsel, sample, "order"); 860 u64 bytes = kmem_page_size << order; 861 struct page_stat *pstat; 862 struct page_stat this = { 863 .order = order, 864 }; 865 866 if (use_pfn) 867 page = evsel__intval(evsel, sample, "pfn"); 868 else 869 page = evsel__intval(evsel, sample, "page"); 870 871 nr_page_frees++; 872 total_page_free_bytes += bytes; 873 874 this.page = page; 875 pstat = page_stat__find_page(&this); 876 if (pstat == NULL) { 877 pr_debug2("missing free at page %"PRIx64" (order: %d)\n", 878 page, order); 879 880 nr_page_nomatch++; 881 total_page_nomatch_bytes += bytes; 882 883 return 0; 884 } 885 886 this.gfp_flags = pstat->gfp_flags; 887 this.migrate_type = pstat->migrate_type; 888 this.callsite = pstat->callsite; 889 890 rb_erase(&pstat->node, &page_live_tree); 891 free(pstat); 892 893 if (live_page) { 894 order_stats[this.order][this.migrate_type]--; 895 } else { 896 pstat = page_stat__find_alloc(&this); 897 if (pstat == NULL) 898 return -ENOMEM; 899 900 pstat->nr_free++; 901 pstat->free_bytes += bytes; 902 } 903 904 pstat = page_stat__find_caller(&this); 905 if (pstat == NULL) 906 return -ENOENT; 907 908 pstat->nr_free++; 909 pstat->free_bytes += bytes; 910 911 if (live_page) { 912 pstat->nr_alloc--; 913 pstat->alloc_bytes -= bytes; 914 915 if (pstat->nr_alloc == 0) { 916 rb_erase(&pstat->node, &page_caller_tree); 917 free(pstat); 918 } 919 } 920 921 return 0; 922 } 923 924 static bool perf_kmem__skip_sample(struct perf_sample *sample) 925 { 926 /* skip sample based on time? */ 927 if (perf_time__skip_sample(&ptime, sample->time)) 928 return true; 929 930 return false; 931 } 932 933 typedef int (*tracepoint_handler)(struct evsel *evsel, 934 struct perf_sample *sample); 935 936 static int process_sample_event(struct perf_tool *tool __maybe_unused, 937 union perf_event *event, 938 struct perf_sample *sample, 939 struct evsel *evsel, 940 struct machine *machine) 941 { 942 int err = 0; 943 struct thread *thread = machine__findnew_thread(machine, sample->pid, 944 sample->tid); 945 946 if (thread == NULL) { 947 pr_debug("problem processing %d event, skipping it.\n", 948 event->header.type); 949 return -1; 950 } 951 952 if (perf_kmem__skip_sample(sample)) 953 return 0; 954 955 dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid); 956 957 if (evsel->handler != NULL) { 958 tracepoint_handler f = evsel->handler; 959 err = f(evsel, sample); 960 } 961 962 thread__put(thread); 963 964 return err; 965 } 966 967 static struct perf_tool perf_kmem = { 968 .sample = process_sample_event, 969 .comm = perf_event__process_comm, 970 .mmap = perf_event__process_mmap, 971 .mmap2 = perf_event__process_mmap2, 972 .namespaces = perf_event__process_namespaces, 973 .ordered_events = true, 974 }; 975 976 static double fragmentation(unsigned long n_req, unsigned long n_alloc) 977 { 978 if (n_alloc == 0) 979 return 0.0; 980 else 981 return 100.0 - (100.0 * n_req / n_alloc); 982 } 983 984 static void __print_slab_result(struct rb_root *root, 985 struct perf_session *session, 986 int n_lines, int is_caller) 987 { 988 struct rb_node *next; 989 struct machine *machine = &session->machines.host; 990 991 printf("%.105s\n", graph_dotted_line); 992 printf(" %-34s |", is_caller ? "Callsite": "Alloc Ptr"); 993 printf(" Total_alloc/Per | Total_req/Per | Hit | Ping-pong | Frag\n"); 994 printf("%.105s\n", graph_dotted_line); 995 996 next = rb_first(root); 997 998 while (next && n_lines--) { 999 struct alloc_stat *data = rb_entry(next, struct alloc_stat, 1000 node); 1001 struct symbol *sym = NULL; 1002 struct map *map; 1003 char buf[BUFSIZ]; 1004 u64 addr; 1005 1006 if (is_caller) { 1007 addr = data->call_site; 1008 if (!raw_ip) 1009 sym = machine__find_kernel_symbol(machine, addr, &map); 1010 } else 1011 addr = data->ptr; 1012 1013 if (sym != NULL) 1014 snprintf(buf, sizeof(buf), "%s+%" PRIx64 "", sym->name, 1015 addr - map->unmap_ip(map, sym->start)); 1016 else 1017 snprintf(buf, sizeof(buf), "%#" PRIx64 "", addr); 1018 printf(" %-34s |", buf); 1019 1020 printf(" %9llu/%-5lu | %9llu/%-5lu | %8lu | %9lu | %6.3f%%\n", 1021 (unsigned long long)data->bytes_alloc, 1022 (unsigned long)data->bytes_alloc / data->hit, 1023 (unsigned long long)data->bytes_req, 1024 (unsigned long)data->bytes_req / data->hit, 1025 (unsigned long)data->hit, 1026 (unsigned long)data->pingpong, 1027 fragmentation(data->bytes_req, data->bytes_alloc)); 1028 1029 next = rb_next(next); 1030 } 1031 1032 if (n_lines == -1) 1033 printf(" ... | ... | ... | ... | ... | ... \n"); 1034 1035 printf("%.105s\n", graph_dotted_line); 1036 } 1037 1038 static const char * const migrate_type_str[] = { 1039 "UNMOVABL", 1040 "RECLAIM", 1041 "MOVABLE", 1042 "RESERVED", 1043 "CMA/ISLT", 1044 "UNKNOWN", 1045 }; 1046 1047 static void __print_page_alloc_result(struct perf_session *session, int n_lines) 1048 { 1049 struct rb_node *next = rb_first(&page_alloc_sorted); 1050 struct machine *machine = &session->machines.host; 1051 const char *format; 1052 int gfp_len = max(strlen("GFP flags"), max_gfp_len); 1053 1054 printf("\n%.105s\n", graph_dotted_line); 1055 printf(" %-16s | %5s alloc (KB) | Hits | Order | Mig.type | %-*s | Callsite\n", 1056 use_pfn ? "PFN" : "Page", live_page ? "Live" : "Total", 1057 gfp_len, "GFP flags"); 1058 printf("%.105s\n", graph_dotted_line); 1059 1060 if (use_pfn) 1061 format = " %16llu | %'16llu | %'9d | %5d | %8s | %-*s | %s\n"; 1062 else 1063 format = " %016llx | %'16llu | %'9d | %5d | %8s | %-*s | %s\n"; 1064 1065 while (next && n_lines--) { 1066 struct page_stat *data; 1067 struct symbol *sym; 1068 struct map *map; 1069 char buf[32]; 1070 char *caller = buf; 1071 1072 data = rb_entry(next, struct page_stat, node); 1073 sym = machine__find_kernel_symbol(machine, data->callsite, &map); 1074 if (sym) 1075 caller = sym->name; 1076 else 1077 scnprintf(buf, sizeof(buf), "%"PRIx64, data->callsite); 1078 1079 printf(format, (unsigned long long)data->page, 1080 (unsigned long long)data->alloc_bytes / 1024, 1081 data->nr_alloc, data->order, 1082 migrate_type_str[data->migrate_type], 1083 gfp_len, compact_gfp_string(data->gfp_flags), caller); 1084 1085 next = rb_next(next); 1086 } 1087 1088 if (n_lines == -1) { 1089 printf(" ... | ... | ... | ... | ... | %-*s | ...\n", 1090 gfp_len, "..."); 1091 } 1092 1093 printf("%.105s\n", graph_dotted_line); 1094 } 1095 1096 static void __print_page_caller_result(struct perf_session *session, int n_lines) 1097 { 1098 struct rb_node *next = rb_first(&page_caller_sorted); 1099 struct machine *machine = &session->machines.host; 1100 int gfp_len = max(strlen("GFP flags"), max_gfp_len); 1101 1102 printf("\n%.105s\n", graph_dotted_line); 1103 printf(" %5s alloc (KB) | Hits | Order | Mig.type | %-*s | Callsite\n", 1104 live_page ? "Live" : "Total", gfp_len, "GFP flags"); 1105 printf("%.105s\n", graph_dotted_line); 1106 1107 while (next && n_lines--) { 1108 struct page_stat *data; 1109 struct symbol *sym; 1110 struct map *map; 1111 char buf[32]; 1112 char *caller = buf; 1113 1114 data = rb_entry(next, struct page_stat, node); 1115 sym = machine__find_kernel_symbol(machine, data->callsite, &map); 1116 if (sym) 1117 caller = sym->name; 1118 else 1119 scnprintf(buf, sizeof(buf), "%"PRIx64, data->callsite); 1120 1121 printf(" %'16llu | %'9d | %5d | %8s | %-*s | %s\n", 1122 (unsigned long long)data->alloc_bytes / 1024, 1123 data->nr_alloc, data->order, 1124 migrate_type_str[data->migrate_type], 1125 gfp_len, compact_gfp_string(data->gfp_flags), caller); 1126 1127 next = rb_next(next); 1128 } 1129 1130 if (n_lines == -1) { 1131 printf(" ... | ... | ... | ... | %-*s | ...\n", 1132 gfp_len, "..."); 1133 } 1134 1135 printf("%.105s\n", graph_dotted_line); 1136 } 1137 1138 static void print_gfp_flags(void) 1139 { 1140 int i; 1141 1142 printf("#\n"); 1143 printf("# GFP flags\n"); 1144 printf("# ---------\n"); 1145 for (i = 0; i < nr_gfps; i++) { 1146 printf("# %08x: %*s: %s\n", gfps[i].flags, 1147 (int) max_gfp_len, gfps[i].compact_str, 1148 gfps[i].human_readable); 1149 } 1150 } 1151 1152 static void print_slab_summary(void) 1153 { 1154 printf("\nSUMMARY (SLAB allocator)"); 1155 printf("\n========================\n"); 1156 printf("Total bytes requested: %'lu\n", total_requested); 1157 printf("Total bytes allocated: %'lu\n", total_allocated); 1158 printf("Total bytes freed: %'lu\n", total_freed); 1159 if (total_allocated > total_freed) { 1160 printf("Net total bytes allocated: %'lu\n", 1161 total_allocated - total_freed); 1162 } 1163 printf("Total bytes wasted on internal fragmentation: %'lu\n", 1164 total_allocated - total_requested); 1165 printf("Internal fragmentation: %f%%\n", 1166 fragmentation(total_requested, total_allocated)); 1167 printf("Cross CPU allocations: %'lu/%'lu\n", nr_cross_allocs, nr_allocs); 1168 } 1169 1170 static void print_page_summary(void) 1171 { 1172 int o, m; 1173 u64 nr_alloc_freed = nr_page_frees - nr_page_nomatch; 1174 u64 total_alloc_freed_bytes = total_page_free_bytes - total_page_nomatch_bytes; 1175 1176 printf("\nSUMMARY (page allocator)"); 1177 printf("\n========================\n"); 1178 printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total allocation requests", 1179 nr_page_allocs, total_page_alloc_bytes / 1024); 1180 printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total free requests", 1181 nr_page_frees, total_page_free_bytes / 1024); 1182 printf("\n"); 1183 1184 printf("%-30s: %'16"PRIu64" [ %'16"PRIu64" KB ]\n", "Total alloc+freed requests", 1185 nr_alloc_freed, (total_alloc_freed_bytes) / 1024); 1186 printf("%-30s: %'16"PRIu64" [ %'16"PRIu64" KB ]\n", "Total alloc-only requests", 1187 nr_page_allocs - nr_alloc_freed, 1188 (total_page_alloc_bytes - total_alloc_freed_bytes) / 1024); 1189 printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total free-only requests", 1190 nr_page_nomatch, total_page_nomatch_bytes / 1024); 1191 printf("\n"); 1192 1193 printf("%-30s: %'16lu [ %'16"PRIu64" KB ]\n", "Total allocation failures", 1194 nr_page_fails, total_page_fail_bytes / 1024); 1195 printf("\n"); 1196 1197 printf("%5s %12s %12s %12s %12s %12s\n", "Order", "Unmovable", 1198 "Reclaimable", "Movable", "Reserved", "CMA/Isolated"); 1199 printf("%.5s %.12s %.12s %.12s %.12s %.12s\n", graph_dotted_line, 1200 graph_dotted_line, graph_dotted_line, graph_dotted_line, 1201 graph_dotted_line, graph_dotted_line); 1202 1203 for (o = 0; o < MAX_PAGE_ORDER; o++) { 1204 printf("%5d", o); 1205 for (m = 0; m < MAX_MIGRATE_TYPES - 1; m++) { 1206 if (order_stats[o][m]) 1207 printf(" %'12d", order_stats[o][m]); 1208 else 1209 printf(" %12c", '.'); 1210 } 1211 printf("\n"); 1212 } 1213 } 1214 1215 static void print_slab_result(struct perf_session *session) 1216 { 1217 if (caller_flag) 1218 __print_slab_result(&root_caller_sorted, session, caller_lines, 1); 1219 if (alloc_flag) 1220 __print_slab_result(&root_alloc_sorted, session, alloc_lines, 0); 1221 print_slab_summary(); 1222 } 1223 1224 static void print_page_result(struct perf_session *session) 1225 { 1226 if (caller_flag || alloc_flag) 1227 print_gfp_flags(); 1228 if (caller_flag) 1229 __print_page_caller_result(session, caller_lines); 1230 if (alloc_flag) 1231 __print_page_alloc_result(session, alloc_lines); 1232 print_page_summary(); 1233 } 1234 1235 static void print_result(struct perf_session *session) 1236 { 1237 if (kmem_slab) 1238 print_slab_result(session); 1239 if (kmem_page) 1240 print_page_result(session); 1241 } 1242 1243 static LIST_HEAD(slab_caller_sort); 1244 static LIST_HEAD(slab_alloc_sort); 1245 static LIST_HEAD(page_caller_sort); 1246 static LIST_HEAD(page_alloc_sort); 1247 1248 static void sort_slab_insert(struct rb_root *root, struct alloc_stat *data, 1249 struct list_head *sort_list) 1250 { 1251 struct rb_node **new = &(root->rb_node); 1252 struct rb_node *parent = NULL; 1253 struct sort_dimension *sort; 1254 1255 while (*new) { 1256 struct alloc_stat *this; 1257 int cmp = 0; 1258 1259 this = rb_entry(*new, struct alloc_stat, node); 1260 parent = *new; 1261 1262 list_for_each_entry(sort, sort_list, list) { 1263 cmp = sort->cmp(data, this); 1264 if (cmp) 1265 break; 1266 } 1267 1268 if (cmp > 0) 1269 new = &((*new)->rb_left); 1270 else 1271 new = &((*new)->rb_right); 1272 } 1273 1274 rb_link_node(&data->node, parent, new); 1275 rb_insert_color(&data->node, root); 1276 } 1277 1278 static void __sort_slab_result(struct rb_root *root, struct rb_root *root_sorted, 1279 struct list_head *sort_list) 1280 { 1281 struct rb_node *node; 1282 struct alloc_stat *data; 1283 1284 for (;;) { 1285 node = rb_first(root); 1286 if (!node) 1287 break; 1288 1289 rb_erase(node, root); 1290 data = rb_entry(node, struct alloc_stat, node); 1291 sort_slab_insert(root_sorted, data, sort_list); 1292 } 1293 } 1294 1295 static void sort_page_insert(struct rb_root *root, struct page_stat *data, 1296 struct list_head *sort_list) 1297 { 1298 struct rb_node **new = &root->rb_node; 1299 struct rb_node *parent = NULL; 1300 struct sort_dimension *sort; 1301 1302 while (*new) { 1303 struct page_stat *this; 1304 int cmp = 0; 1305 1306 this = rb_entry(*new, struct page_stat, node); 1307 parent = *new; 1308 1309 list_for_each_entry(sort, sort_list, list) { 1310 cmp = sort->cmp(data, this); 1311 if (cmp) 1312 break; 1313 } 1314 1315 if (cmp > 0) 1316 new = &parent->rb_left; 1317 else 1318 new = &parent->rb_right; 1319 } 1320 1321 rb_link_node(&data->node, parent, new); 1322 rb_insert_color(&data->node, root); 1323 } 1324 1325 static void __sort_page_result(struct rb_root *root, struct rb_root *root_sorted, 1326 struct list_head *sort_list) 1327 { 1328 struct rb_node *node; 1329 struct page_stat *data; 1330 1331 for (;;) { 1332 node = rb_first(root); 1333 if (!node) 1334 break; 1335 1336 rb_erase(node, root); 1337 data = rb_entry(node, struct page_stat, node); 1338 sort_page_insert(root_sorted, data, sort_list); 1339 } 1340 } 1341 1342 static void sort_result(void) 1343 { 1344 if (kmem_slab) { 1345 __sort_slab_result(&root_alloc_stat, &root_alloc_sorted, 1346 &slab_alloc_sort); 1347 __sort_slab_result(&root_caller_stat, &root_caller_sorted, 1348 &slab_caller_sort); 1349 } 1350 if (kmem_page) { 1351 if (live_page) 1352 __sort_page_result(&page_live_tree, &page_alloc_sorted, 1353 &page_alloc_sort); 1354 else 1355 __sort_page_result(&page_alloc_tree, &page_alloc_sorted, 1356 &page_alloc_sort); 1357 1358 __sort_page_result(&page_caller_tree, &page_caller_sorted, 1359 &page_caller_sort); 1360 } 1361 } 1362 1363 static int __cmd_kmem(struct perf_session *session) 1364 { 1365 int err = -EINVAL; 1366 struct evsel *evsel; 1367 const struct evsel_str_handler kmem_tracepoints[] = { 1368 /* slab allocator */ 1369 { "kmem:kmalloc", evsel__process_alloc_event, }, 1370 { "kmem:kmem_cache_alloc", evsel__process_alloc_event, }, 1371 { "kmem:kmalloc_node", evsel__process_alloc_node_event, }, 1372 { "kmem:kmem_cache_alloc_node", evsel__process_alloc_node_event, }, 1373 { "kmem:kfree", evsel__process_free_event, }, 1374 { "kmem:kmem_cache_free", evsel__process_free_event, }, 1375 /* page allocator */ 1376 { "kmem:mm_page_alloc", evsel__process_page_alloc_event, }, 1377 { "kmem:mm_page_free", evsel__process_page_free_event, }, 1378 }; 1379 1380 if (!perf_session__has_traces(session, "kmem record")) 1381 goto out; 1382 1383 if (perf_session__set_tracepoints_handlers(session, kmem_tracepoints)) { 1384 pr_err("Initializing perf session tracepoint handlers failed\n"); 1385 goto out; 1386 } 1387 1388 evlist__for_each_entry(session->evlist, evsel) { 1389 if (!strcmp(evsel__name(evsel), "kmem:mm_page_alloc") && 1390 evsel__field(evsel, "pfn")) { 1391 use_pfn = true; 1392 break; 1393 } 1394 } 1395 1396 setup_pager(); 1397 err = perf_session__process_events(session); 1398 if (err != 0) { 1399 pr_err("error during process events: %d\n", err); 1400 goto out; 1401 } 1402 sort_result(); 1403 print_result(session); 1404 out: 1405 return err; 1406 } 1407 1408 /* slab sort keys */ 1409 static int ptr_cmp(void *a, void *b) 1410 { 1411 struct alloc_stat *l = a; 1412 struct alloc_stat *r = b; 1413 1414 if (l->ptr < r->ptr) 1415 return -1; 1416 else if (l->ptr > r->ptr) 1417 return 1; 1418 return 0; 1419 } 1420 1421 static struct sort_dimension ptr_sort_dimension = { 1422 .name = "ptr", 1423 .cmp = ptr_cmp, 1424 }; 1425 1426 static int slab_callsite_cmp(void *a, void *b) 1427 { 1428 struct alloc_stat *l = a; 1429 struct alloc_stat *r = b; 1430 1431 if (l->call_site < r->call_site) 1432 return -1; 1433 else if (l->call_site > r->call_site) 1434 return 1; 1435 return 0; 1436 } 1437 1438 static struct sort_dimension callsite_sort_dimension = { 1439 .name = "callsite", 1440 .cmp = slab_callsite_cmp, 1441 }; 1442 1443 static int hit_cmp(void *a, void *b) 1444 { 1445 struct alloc_stat *l = a; 1446 struct alloc_stat *r = b; 1447 1448 if (l->hit < r->hit) 1449 return -1; 1450 else if (l->hit > r->hit) 1451 return 1; 1452 return 0; 1453 } 1454 1455 static struct sort_dimension hit_sort_dimension = { 1456 .name = "hit", 1457 .cmp = hit_cmp, 1458 }; 1459 1460 static int bytes_cmp(void *a, void *b) 1461 { 1462 struct alloc_stat *l = a; 1463 struct alloc_stat *r = b; 1464 1465 if (l->bytes_alloc < r->bytes_alloc) 1466 return -1; 1467 else if (l->bytes_alloc > r->bytes_alloc) 1468 return 1; 1469 return 0; 1470 } 1471 1472 static struct sort_dimension bytes_sort_dimension = { 1473 .name = "bytes", 1474 .cmp = bytes_cmp, 1475 }; 1476 1477 static int frag_cmp(void *a, void *b) 1478 { 1479 double x, y; 1480 struct alloc_stat *l = a; 1481 struct alloc_stat *r = b; 1482 1483 x = fragmentation(l->bytes_req, l->bytes_alloc); 1484 y = fragmentation(r->bytes_req, r->bytes_alloc); 1485 1486 if (x < y) 1487 return -1; 1488 else if (x > y) 1489 return 1; 1490 return 0; 1491 } 1492 1493 static struct sort_dimension frag_sort_dimension = { 1494 .name = "frag", 1495 .cmp = frag_cmp, 1496 }; 1497 1498 static int pingpong_cmp(void *a, void *b) 1499 { 1500 struct alloc_stat *l = a; 1501 struct alloc_stat *r = b; 1502 1503 if (l->pingpong < r->pingpong) 1504 return -1; 1505 else if (l->pingpong > r->pingpong) 1506 return 1; 1507 return 0; 1508 } 1509 1510 static struct sort_dimension pingpong_sort_dimension = { 1511 .name = "pingpong", 1512 .cmp = pingpong_cmp, 1513 }; 1514 1515 /* page sort keys */ 1516 static int page_cmp(void *a, void *b) 1517 { 1518 struct page_stat *l = a; 1519 struct page_stat *r = b; 1520 1521 if (l->page < r->page) 1522 return -1; 1523 else if (l->page > r->page) 1524 return 1; 1525 return 0; 1526 } 1527 1528 static struct sort_dimension page_sort_dimension = { 1529 .name = "page", 1530 .cmp = page_cmp, 1531 }; 1532 1533 static int page_callsite_cmp(void *a, void *b) 1534 { 1535 struct page_stat *l = a; 1536 struct page_stat *r = b; 1537 1538 if (l->callsite < r->callsite) 1539 return -1; 1540 else if (l->callsite > r->callsite) 1541 return 1; 1542 return 0; 1543 } 1544 1545 static struct sort_dimension page_callsite_sort_dimension = { 1546 .name = "callsite", 1547 .cmp = page_callsite_cmp, 1548 }; 1549 1550 static int page_hit_cmp(void *a, void *b) 1551 { 1552 struct page_stat *l = a; 1553 struct page_stat *r = b; 1554 1555 if (l->nr_alloc < r->nr_alloc) 1556 return -1; 1557 else if (l->nr_alloc > r->nr_alloc) 1558 return 1; 1559 return 0; 1560 } 1561 1562 static struct sort_dimension page_hit_sort_dimension = { 1563 .name = "hit", 1564 .cmp = page_hit_cmp, 1565 }; 1566 1567 static int page_bytes_cmp(void *a, void *b) 1568 { 1569 struct page_stat *l = a; 1570 struct page_stat *r = b; 1571 1572 if (l->alloc_bytes < r->alloc_bytes) 1573 return -1; 1574 else if (l->alloc_bytes > r->alloc_bytes) 1575 return 1; 1576 return 0; 1577 } 1578 1579 static struct sort_dimension page_bytes_sort_dimension = { 1580 .name = "bytes", 1581 .cmp = page_bytes_cmp, 1582 }; 1583 1584 static int page_order_cmp(void *a, void *b) 1585 { 1586 struct page_stat *l = a; 1587 struct page_stat *r = b; 1588 1589 if (l->order < r->order) 1590 return -1; 1591 else if (l->order > r->order) 1592 return 1; 1593 return 0; 1594 } 1595 1596 static struct sort_dimension page_order_sort_dimension = { 1597 .name = "order", 1598 .cmp = page_order_cmp, 1599 }; 1600 1601 static int migrate_type_cmp(void *a, void *b) 1602 { 1603 struct page_stat *l = a; 1604 struct page_stat *r = b; 1605 1606 /* for internal use to find free'd page */ 1607 if (l->migrate_type == -1U) 1608 return 0; 1609 1610 if (l->migrate_type < r->migrate_type) 1611 return -1; 1612 else if (l->migrate_type > r->migrate_type) 1613 return 1; 1614 return 0; 1615 } 1616 1617 static struct sort_dimension migrate_type_sort_dimension = { 1618 .name = "migtype", 1619 .cmp = migrate_type_cmp, 1620 }; 1621 1622 static int gfp_flags_cmp(void *a, void *b) 1623 { 1624 struct page_stat *l = a; 1625 struct page_stat *r = b; 1626 1627 /* for internal use to find free'd page */ 1628 if (l->gfp_flags == -1U) 1629 return 0; 1630 1631 if (l->gfp_flags < r->gfp_flags) 1632 return -1; 1633 else if (l->gfp_flags > r->gfp_flags) 1634 return 1; 1635 return 0; 1636 } 1637 1638 static struct sort_dimension gfp_flags_sort_dimension = { 1639 .name = "gfp", 1640 .cmp = gfp_flags_cmp, 1641 }; 1642 1643 static struct sort_dimension *slab_sorts[] = { 1644 &ptr_sort_dimension, 1645 &callsite_sort_dimension, 1646 &hit_sort_dimension, 1647 &bytes_sort_dimension, 1648 &frag_sort_dimension, 1649 &pingpong_sort_dimension, 1650 }; 1651 1652 static struct sort_dimension *page_sorts[] = { 1653 &page_sort_dimension, 1654 &page_callsite_sort_dimension, 1655 &page_hit_sort_dimension, 1656 &page_bytes_sort_dimension, 1657 &page_order_sort_dimension, 1658 &migrate_type_sort_dimension, 1659 &gfp_flags_sort_dimension, 1660 }; 1661 1662 static int slab_sort_dimension__add(const char *tok, struct list_head *list) 1663 { 1664 struct sort_dimension *sort; 1665 int i; 1666 1667 for (i = 0; i < (int)ARRAY_SIZE(slab_sorts); i++) { 1668 if (!strcmp(slab_sorts[i]->name, tok)) { 1669 sort = memdup(slab_sorts[i], sizeof(*slab_sorts[i])); 1670 if (!sort) { 1671 pr_err("%s: memdup failed\n", __func__); 1672 return -1; 1673 } 1674 list_add_tail(&sort->list, list); 1675 return 0; 1676 } 1677 } 1678 1679 return -1; 1680 } 1681 1682 static int page_sort_dimension__add(const char *tok, struct list_head *list) 1683 { 1684 struct sort_dimension *sort; 1685 int i; 1686 1687 for (i = 0; i < (int)ARRAY_SIZE(page_sorts); i++) { 1688 if (!strcmp(page_sorts[i]->name, tok)) { 1689 sort = memdup(page_sorts[i], sizeof(*page_sorts[i])); 1690 if (!sort) { 1691 pr_err("%s: memdup failed\n", __func__); 1692 return -1; 1693 } 1694 list_add_tail(&sort->list, list); 1695 return 0; 1696 } 1697 } 1698 1699 return -1; 1700 } 1701 1702 static int setup_slab_sorting(struct list_head *sort_list, const char *arg) 1703 { 1704 char *tok; 1705 char *str = strdup(arg); 1706 char *pos = str; 1707 1708 if (!str) { 1709 pr_err("%s: strdup failed\n", __func__); 1710 return -1; 1711 } 1712 1713 while (true) { 1714 tok = strsep(&pos, ","); 1715 if (!tok) 1716 break; 1717 if (slab_sort_dimension__add(tok, sort_list) < 0) { 1718 pr_err("Unknown slab --sort key: '%s'", tok); 1719 free(str); 1720 return -1; 1721 } 1722 } 1723 1724 free(str); 1725 return 0; 1726 } 1727 1728 static int setup_page_sorting(struct list_head *sort_list, const char *arg) 1729 { 1730 char *tok; 1731 char *str = strdup(arg); 1732 char *pos = str; 1733 1734 if (!str) { 1735 pr_err("%s: strdup failed\n", __func__); 1736 return -1; 1737 } 1738 1739 while (true) { 1740 tok = strsep(&pos, ","); 1741 if (!tok) 1742 break; 1743 if (page_sort_dimension__add(tok, sort_list) < 0) { 1744 pr_err("Unknown page --sort key: '%s'", tok); 1745 free(str); 1746 return -1; 1747 } 1748 } 1749 1750 free(str); 1751 return 0; 1752 } 1753 1754 static int parse_sort_opt(const struct option *opt __maybe_unused, 1755 const char *arg, int unset __maybe_unused) 1756 { 1757 if (!arg) 1758 return -1; 1759 1760 if (kmem_page > kmem_slab || 1761 (kmem_page == 0 && kmem_slab == 0 && kmem_default == KMEM_PAGE)) { 1762 if (caller_flag > alloc_flag) 1763 return setup_page_sorting(&page_caller_sort, arg); 1764 else 1765 return setup_page_sorting(&page_alloc_sort, arg); 1766 } else { 1767 if (caller_flag > alloc_flag) 1768 return setup_slab_sorting(&slab_caller_sort, arg); 1769 else 1770 return setup_slab_sorting(&slab_alloc_sort, arg); 1771 } 1772 1773 return 0; 1774 } 1775 1776 static int parse_caller_opt(const struct option *opt __maybe_unused, 1777 const char *arg __maybe_unused, 1778 int unset __maybe_unused) 1779 { 1780 caller_flag = (alloc_flag + 1); 1781 return 0; 1782 } 1783 1784 static int parse_alloc_opt(const struct option *opt __maybe_unused, 1785 const char *arg __maybe_unused, 1786 int unset __maybe_unused) 1787 { 1788 alloc_flag = (caller_flag + 1); 1789 return 0; 1790 } 1791 1792 static int parse_slab_opt(const struct option *opt __maybe_unused, 1793 const char *arg __maybe_unused, 1794 int unset __maybe_unused) 1795 { 1796 kmem_slab = (kmem_page + 1); 1797 return 0; 1798 } 1799 1800 static int parse_page_opt(const struct option *opt __maybe_unused, 1801 const char *arg __maybe_unused, 1802 int unset __maybe_unused) 1803 { 1804 kmem_page = (kmem_slab + 1); 1805 return 0; 1806 } 1807 1808 static int parse_line_opt(const struct option *opt __maybe_unused, 1809 const char *arg, int unset __maybe_unused) 1810 { 1811 int lines; 1812 1813 if (!arg) 1814 return -1; 1815 1816 lines = strtoul(arg, NULL, 10); 1817 1818 if (caller_flag > alloc_flag) 1819 caller_lines = lines; 1820 else 1821 alloc_lines = lines; 1822 1823 return 0; 1824 } 1825 1826 static int __cmd_record(int argc, const char **argv) 1827 { 1828 const char * const record_args[] = { 1829 "record", "-a", "-R", "-c", "1", 1830 }; 1831 const char * const slab_events[] = { 1832 "-e", "kmem:kmalloc", 1833 "-e", "kmem:kmalloc_node", 1834 "-e", "kmem:kfree", 1835 "-e", "kmem:kmem_cache_alloc", 1836 "-e", "kmem:kmem_cache_alloc_node", 1837 "-e", "kmem:kmem_cache_free", 1838 }; 1839 const char * const page_events[] = { 1840 "-e", "kmem:mm_page_alloc", 1841 "-e", "kmem:mm_page_free", 1842 }; 1843 unsigned int rec_argc, i, j; 1844 const char **rec_argv; 1845 1846 rec_argc = ARRAY_SIZE(record_args) + argc - 1; 1847 if (kmem_slab) 1848 rec_argc += ARRAY_SIZE(slab_events); 1849 if (kmem_page) 1850 rec_argc += ARRAY_SIZE(page_events) + 1; /* for -g */ 1851 1852 rec_argv = calloc(rec_argc + 1, sizeof(char *)); 1853 1854 if (rec_argv == NULL) 1855 return -ENOMEM; 1856 1857 for (i = 0; i < ARRAY_SIZE(record_args); i++) 1858 rec_argv[i] = strdup(record_args[i]); 1859 1860 if (kmem_slab) { 1861 for (j = 0; j < ARRAY_SIZE(slab_events); j++, i++) 1862 rec_argv[i] = strdup(slab_events[j]); 1863 } 1864 if (kmem_page) { 1865 rec_argv[i++] = strdup("-g"); 1866 1867 for (j = 0; j < ARRAY_SIZE(page_events); j++, i++) 1868 rec_argv[i] = strdup(page_events[j]); 1869 } 1870 1871 for (j = 1; j < (unsigned int)argc; j++, i++) 1872 rec_argv[i] = argv[j]; 1873 1874 return cmd_record(i, rec_argv); 1875 } 1876 1877 static int kmem_config(const char *var, const char *value, void *cb __maybe_unused) 1878 { 1879 if (!strcmp(var, "kmem.default")) { 1880 if (!strcmp(value, "slab")) 1881 kmem_default = KMEM_SLAB; 1882 else if (!strcmp(value, "page")) 1883 kmem_default = KMEM_PAGE; 1884 else 1885 pr_err("invalid default value ('slab' or 'page' required): %s\n", 1886 value); 1887 return 0; 1888 } 1889 1890 return 0; 1891 } 1892 1893 int cmd_kmem(int argc, const char **argv) 1894 { 1895 const char * const default_slab_sort = "frag,hit,bytes"; 1896 const char * const default_page_sort = "bytes,hit"; 1897 struct perf_data data = { 1898 .mode = PERF_DATA_MODE_READ, 1899 }; 1900 const struct option kmem_options[] = { 1901 OPT_STRING('i', "input", &input_name, "file", "input file name"), 1902 OPT_INCR('v', "verbose", &verbose, 1903 "be more verbose (show symbol address, etc)"), 1904 OPT_CALLBACK_NOOPT(0, "caller", NULL, NULL, 1905 "show per-callsite statistics", parse_caller_opt), 1906 OPT_CALLBACK_NOOPT(0, "alloc", NULL, NULL, 1907 "show per-allocation statistics", parse_alloc_opt), 1908 OPT_CALLBACK('s', "sort", NULL, "key[,key2...]", 1909 "sort by keys: ptr, callsite, bytes, hit, pingpong, frag, " 1910 "page, order, migtype, gfp", parse_sort_opt), 1911 OPT_CALLBACK('l', "line", NULL, "num", "show n lines", parse_line_opt), 1912 OPT_BOOLEAN(0, "raw-ip", &raw_ip, "show raw ip instead of symbol"), 1913 OPT_BOOLEAN('f', "force", &data.force, "don't complain, do it"), 1914 OPT_CALLBACK_NOOPT(0, "slab", NULL, NULL, "Analyze slab allocator", 1915 parse_slab_opt), 1916 OPT_CALLBACK_NOOPT(0, "page", NULL, NULL, "Analyze page allocator", 1917 parse_page_opt), 1918 OPT_BOOLEAN(0, "live", &live_page, "Show live page stat"), 1919 OPT_STRING(0, "time", &time_str, "str", 1920 "Time span of interest (start,stop)"), 1921 OPT_END() 1922 }; 1923 const char *const kmem_subcommands[] = { "record", "stat", NULL }; 1924 const char *kmem_usage[] = { 1925 NULL, 1926 NULL 1927 }; 1928 struct perf_session *session; 1929 static const char errmsg[] = "No %s allocation events found. Have you run 'perf kmem record --%s'?\n"; 1930 int ret = perf_config(kmem_config, NULL); 1931 1932 if (ret) 1933 return ret; 1934 1935 argc = parse_options_subcommand(argc, argv, kmem_options, 1936 kmem_subcommands, kmem_usage, 0); 1937 1938 if (!argc) 1939 usage_with_options(kmem_usage, kmem_options); 1940 1941 if (kmem_slab == 0 && kmem_page == 0) { 1942 if (kmem_default == KMEM_SLAB) 1943 kmem_slab = 1; 1944 else 1945 kmem_page = 1; 1946 } 1947 1948 if (!strncmp(argv[0], "rec", 3)) { 1949 symbol__init(NULL); 1950 return __cmd_record(argc, argv); 1951 } 1952 1953 data.path = input_name; 1954 1955 kmem_session = session = perf_session__new(&data, false, &perf_kmem); 1956 if (IS_ERR(session)) 1957 return PTR_ERR(session); 1958 1959 ret = -1; 1960 1961 if (kmem_slab) { 1962 if (!perf_evlist__find_tracepoint_by_name(session->evlist, 1963 "kmem:kmalloc")) { 1964 pr_err(errmsg, "slab", "slab"); 1965 goto out_delete; 1966 } 1967 } 1968 1969 if (kmem_page) { 1970 struct evsel *evsel; 1971 1972 evsel = perf_evlist__find_tracepoint_by_name(session->evlist, 1973 "kmem:mm_page_alloc"); 1974 if (evsel == NULL) { 1975 pr_err(errmsg, "page", "page"); 1976 goto out_delete; 1977 } 1978 1979 kmem_page_size = tep_get_page_size(evsel->tp_format->tep); 1980 symbol_conf.use_callchain = true; 1981 } 1982 1983 symbol__init(&session->header.env); 1984 1985 if (perf_time__parse_str(&ptime, time_str) != 0) { 1986 pr_err("Invalid time string\n"); 1987 ret = -EINVAL; 1988 goto out_delete; 1989 } 1990 1991 if (!strcmp(argv[0], "stat")) { 1992 setlocale(LC_ALL, ""); 1993 1994 if (cpu__setup_cpunode_map()) 1995 goto out_delete; 1996 1997 if (list_empty(&slab_caller_sort)) 1998 setup_slab_sorting(&slab_caller_sort, default_slab_sort); 1999 if (list_empty(&slab_alloc_sort)) 2000 setup_slab_sorting(&slab_alloc_sort, default_slab_sort); 2001 if (list_empty(&page_caller_sort)) 2002 setup_page_sorting(&page_caller_sort, default_page_sort); 2003 if (list_empty(&page_alloc_sort)) 2004 setup_page_sorting(&page_alloc_sort, default_page_sort); 2005 2006 if (kmem_page) { 2007 setup_page_sorting(&page_alloc_sort_input, 2008 "page,order,migtype,gfp"); 2009 setup_page_sorting(&page_caller_sort_input, 2010 "callsite,order,migtype,gfp"); 2011 } 2012 ret = __cmd_kmem(session); 2013 } else 2014 usage_with_options(kmem_usage, kmem_options); 2015 2016 out_delete: 2017 perf_session__delete(session); 2018 2019 return ret; 2020 } 2021 2022