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