kernel/tools/perf/builtin-kmem.c

   1 #include "builtin.h"
   2 #include "perf.h"
   3
   4 #include "util/evlist.h"
   5 #include "util/evsel.h"
   6 #include "util/util.h"
   7 #include "util/cache.h"
   8 #include "util/symbol.h"
   9 #include "util/thread.h"
  10 #include "util/header.h"
  11 #include "util/session.h"
  12 #include "util/tool.h"
  13
  14 #include "util/parse-options.h"
  15 #include "util/trace-event.h"
  16 #include "util/data.h"
  17 #include "util/cpumap.h"
  18
  19 #include "util/debug.h"
  20
  21 #include <linux/rbtree.h>
  22 #include <linux/string.h>
  23 #include <locale.h>
  24
  25 static int      kmem_slab;
  26 static int      kmem_page;
  27
  28 static long     kmem_page_size;
  29
  30 struct alloc_stat;
  31 typedef int (*sort_fn_t)(struct alloc_stat *, struct alloc_stat *);
  32
  33 static int                      alloc_flag;
  34 static int                      caller_flag;
  35
  36 static int                      alloc_lines = -1;
  37 static int                      caller_lines = -1;
  38
  39 static bool                     raw_ip;
  40
  41 struct alloc_stat {
  42         u64     call_site;
  43         u64     ptr;
  44         u64     bytes_req;
  45         u64     bytes_alloc;
  46         u32     hit;
  47         u32     pingpong;
  48
  49         short   alloc_cpu;
  50
  51         struct rb_node node;
  52 };
  53
  54 static struct rb_root root_alloc_stat;
  55 static struct rb_root root_alloc_sorted;
  56 static struct rb_root root_caller_stat;
  57 static struct rb_root root_caller_sorted;
  58
  59 static unsigned long total_requested, total_allocated;
  60 static unsigned long nr_allocs, nr_cross_allocs;
  61
  62 static int insert_alloc_stat(unsigned long call_site, unsigned long ptr,
  63                              int bytes_req, int bytes_alloc, int cpu)
  64 {
  65         struct rb_node **node = &root_alloc_stat.rb_node;
  66         struct rb_node *parent = NULL;
  67         struct alloc_stat *data = NULL;
  68
  69         while (*node) {
  70                 parent = *node;
  71                 data = rb_entry(*node, struct alloc_stat, node);
  72
  73                 if (ptr > data->ptr)
  74                         node = &(*node)->rb_right;
  75                 else if (ptr < data->ptr)
  76                         node = &(*node)->rb_left;
  77                 else
  78                         break;
  79         }
  80
  81         if (data && data->ptr == ptr) {
  82                 data->hit++;
  83                 data->bytes_req += bytes_req;
  84                 data->bytes_alloc += bytes_alloc;
  85         } else {
  86                 data = malloc(sizeof(*data));
  87                 if (!data) {
  88                         pr_err("%s: malloc failed\n", __func__);
  89                         return -1;
  90                 }
  91                 data->ptr = ptr;
  92                 data->pingpong = 0;
  93                 data->hit = 1;
  94                 data->bytes_req = bytes_req;
  95                 data->bytes_alloc = bytes_alloc;
  96
  97                 rb_link_node(&data->node, parent, node);
  98                 rb_insert_color(&data->node, &root_alloc_stat);
  99         }
 100         data->call_site = call_site;
 101         data->alloc_cpu = cpu;
 102         return 0;
 103 }
 104
 105 static int insert_caller_stat(unsigned long call_site,
 106                               int bytes_req, int bytes_alloc)
 107 {
 108         struct rb_node **node = &root_caller_stat.rb_node;
 109         struct rb_node *parent = NULL;
 110         struct alloc_stat *data = NULL;
 111
 112         while (*node) {
 113                 parent = *node;
 114                 data = rb_entry(*node, struct alloc_stat, node);
 115
 116                 if (call_site > data->call_site)
 117                         node = &(*node)->rb_right;
 118                 else if (call_site < data->call_site)
 119                         node = &(*node)->rb_left;
 120                 else
 121                         break;
 122         }
 123
 124         if (data && data->call_site == call_site) {
 125                 data->hit++;
 126                 data->bytes_req += bytes_req;
 127                 data->bytes_alloc += bytes_alloc;
 128         } else {
 129                 data = malloc(sizeof(*data));
 130                 if (!data) {
 131                         pr_err("%s: malloc failed\n", __func__);
 132                         return -1;
 133                 }
 134                 data->call_site = call_site;
 135                 data->pingpong = 0;
 136                 data->hit = 1;
 137                 data->bytes_req = bytes_req;
 138                 data->bytes_alloc = bytes_alloc;
 139
 140                 rb_link_node(&data->node, parent, node);
 141                 rb_insert_color(&data->node, &root_caller_stat);
 142         }
 143
 144         return 0;
 145 }
 146
 147 static int perf_evsel__process_alloc_event(struct perf_evsel *evsel,
 148                                            struct perf_sample *sample)
 149 {
 150         unsigned long ptr = perf_evsel__intval(evsel, sample, "ptr"),
 151                       call_site = perf_evsel__intval(evsel, sample, "call_site");
 152         int bytes_req = perf_evsel__intval(evsel, sample, "bytes_req"),
 153             bytes_alloc = perf_evsel__intval(evsel, sample, "bytes_alloc");
 154
 155         if (insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, sample->cpu) ||
 156             insert_caller_stat(call_site, bytes_req, bytes_alloc))
 157                 return -1;
 158
 159         total_requested += bytes_req;
 160         total_allocated += bytes_alloc;
 161
 162         nr_allocs++;
 163         return 0;
 164 }
 165
 166 static int perf_evsel__process_alloc_node_event(struct perf_evsel *evsel,
 167                                                 struct perf_sample *sample)
 168 {
 169         int ret = perf_evsel__process_alloc_event(evsel, sample);
 170
 171         if (!ret) {
 172                 int node1 = cpu__get_node(sample->cpu),
 173                     node2 = perf_evsel__intval(evsel, sample, "node");
 174
 175                 if (node1 != node2)
 176                         nr_cross_allocs++;
 177         }
 178
 179         return ret;
 180 }
 181
 182 static int ptr_cmp(struct alloc_stat *, struct alloc_stat *);
 183 static int callsite_cmp(struct alloc_stat *, struct alloc_stat *);
 184
 185 static struct alloc_stat *search_alloc_stat(unsigned long ptr,
 186                                             unsigned long call_site,
 187                                             struct rb_root *root,
 188                                             sort_fn_t sort_fn)
 189 {
 190         struct rb_node *node = root->rb_node;
 191         struct alloc_stat key = { .ptr = ptr, .call_site = call_site };
 192
 193         while (node) {
 194                 struct alloc_stat *data;
 195                 int cmp;
 196
 197                 data = rb_entry(node, struct alloc_stat, node);
 198
 199                 cmp = sort_fn(&key, data);
 200                 if (cmp < 0)
 201                         node = node->rb_left;
 202                 else if (cmp > 0)
 203                         node = node->rb_right;
 204                 else
 205                         return data;
 206         }
 207         return NULL;
 208 }
 209
 210 static int perf_evsel__process_free_event(struct perf_evsel *evsel,
 211                                           struct perf_sample *sample)
 212 {
 213         unsigned long ptr = perf_evsel__intval(evsel, sample, "ptr");
 214         struct alloc_stat *s_alloc, *s_caller;
 215
 216         s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp);
 217         if (!s_alloc)
 218                 return 0;
 219
 220         if ((short)sample->cpu != s_alloc->alloc_cpu) {
 221                 s_alloc->pingpong++;
 222
 223                 s_caller = search_alloc_stat(0, s_alloc->call_site,
 224                                              &root_caller_stat, callsite_cmp);
 225                 if (!s_caller)
 226                         return -1;
 227                 s_caller->pingpong++;
 228         }
 229         s_alloc->alloc_cpu = -1;
 230
 231         return 0;
 232 }
 233
 234 static u64 total_page_alloc_bytes;
 235 static u64 total_page_free_bytes;
 236 static u64 total_page_nomatch_bytes;
 237 static u64 total_page_fail_bytes;
 238 static unsigned long nr_page_allocs;
 239 static unsigned long nr_page_frees;
 240 static unsigned long nr_page_fails;
 241 static unsigned long nr_page_nomatch;
 242
 243 static bool use_pfn;
 244
 245 #define MAX_MIGRATE_TYPES  6
 246 #define MAX_PAGE_ORDER     11
 247
 248 static int order_stats[MAX_PAGE_ORDER][MAX_MIGRATE_TYPES];
 249
 250 struct page_stat {
 251         struct rb_node  node;
 252         u64             page;
 253         int             order;
 254         unsigned        gfp_flags;
 255         unsigned        migrate_type;
 256         u64             alloc_bytes;
 257         u64             free_bytes;
 258         int             nr_alloc;
 259         int             nr_free;
 260 };
 261
 262 static struct rb_root page_tree;
 263 static struct rb_root page_alloc_tree;
 264 static struct rb_root page_alloc_sorted;
 265
 266 static struct page_stat *search_page(unsigned long page, bool create)
 267 {
 268         struct rb_node **node = &page_tree.rb_node;
 269         struct rb_node *parent = NULL;
 270         struct page_stat *data;
 271
 272         while (*node) {
 273                 s64 cmp;
 274
 275                 parent = *node;
 276                 data = rb_entry(*node, struct page_stat, node);
 277
 278                 cmp = data->page - page;
 279                 if (cmp < 0)
 280                         node = &parent->rb_left;
 281                 else if (cmp > 0)
 282                         node = &parent->rb_right;
 283                 else
 284                         return data;
 285         }
 286
 287         if (!create)
 288                 return NULL;
 289
 290         data = zalloc(sizeof(*data));
 291         if (data != NULL) {
 292                 data->page = page;
 293
 294                 rb_link_node(&data->node, parent, node);
 295                 rb_insert_color(&data->node, &page_tree);
 296         }
 297
 298         return data;
 299 }
 300
 301 static int page_stat_cmp(struct page_stat *a, struct page_stat *b)
 302 {
 303         if (a->page > b->page)
 304                 return -1;
 305         if (a->page < b->page)
 306                 return 1;
 307         if (a->order > b->order)
 308                 return -1;
 309         if (a->order < b->order)
 310                 return 1;
 311         if (a->migrate_type > b->migrate_type)
 312                 return -1;
 313         if (a->migrate_type < b->migrate_type)
 314                 return 1;
 315         if (a->gfp_flags > b->gfp_flags)
 316                 return -1;
 317         if (a->gfp_flags < b->gfp_flags)
 318                 return 1;
 319         return 0;
 320 }
 321
 322 static struct page_stat *search_page_alloc_stat(struct page_stat *pstat, bool create)
 323 {
 324         struct rb_node **node = &page_alloc_tree.rb_node;
 325         struct rb_node *parent = NULL;
 326         struct page_stat *data;
 327
 328         while (*node) {
 329                 s64 cmp;
 330
 331                 parent = *node;
 332                 data = rb_entry(*node, struct page_stat, node);
 333
 334                 cmp = page_stat_cmp(data, pstat);
 335                 if (cmp < 0)
 336                         node = &parent->rb_left;
 337                 else if (cmp > 0)
 338                         node = &parent->rb_right;
 339                 else
 340                         return data;
 341         }
 342
 343         if (!create)
 344                 return NULL;
 345
 346         data = zalloc(sizeof(*data));
 347         if (data != NULL) {
 348                 data->page = pstat->page;
 349                 data->order = pstat->order;
 350                 data->gfp_flags = pstat->gfp_flags;
 351                 data->migrate_type = pstat->migrate_type;
 352
 353                 rb_link_node(&data->node, parent, node);
 354                 rb_insert_color(&data->node, &page_alloc_tree);
 355         }
 356
 357         return data;
 358 }
 359
 360 static bool valid_page(u64 pfn_or_page)
 361 {
 362         if (use_pfn && pfn_or_page == -1UL)
 363                 return false;
 364         if (!use_pfn && pfn_or_page == 0)
 365                 return false;
 366         return true;
 367 }
 368
 369 static int perf_evsel__process_page_alloc_event(struct perf_evsel *evsel,
 370                                                 struct perf_sample *sample)
 371 {
 372         u64 page;
 373         unsigned int order = perf_evsel__intval(evsel, sample, "order");
 374         unsigned int gfp_flags = perf_evsel__intval(evsel, sample, "gfp_flags");
 375         unsigned int migrate_type = perf_evsel__intval(evsel, sample,
 376                                                        "migratetype");
 377         u64 bytes = kmem_page_size << order;
 378         struct page_stat *pstat;
 379         struct page_stat this = {
 380                 .order = order,
 381                 .gfp_flags = gfp_flags,
 382                 .migrate_type = migrate_type,
 383         };
 384
 385         if (use_pfn)
 386                 page = perf_evsel__intval(evsel, sample, "pfn");
 387         else
 388                 page = perf_evsel__intval(evsel, sample, "page");
 389
 390         nr_page_allocs++;
 391         total_page_alloc_bytes += bytes;
 392
 393         if (!valid_page(page)) {
 394                 nr_page_fails++;
 395                 total_page_fail_bytes += bytes;
 396
 397                 return 0;
 398         }
 399
 400         /*
 401          * This is to find the current page (with correct gfp flags and
 402          * migrate type) at free event.
 403          */
 404         pstat = search_page(page, true);
 405         if (pstat == NULL)
 406                 return -ENOMEM;
 407
 408         pstat->order = order;
 409         pstat->gfp_flags = gfp_flags;
 410         pstat->migrate_type = migrate_type;
 411
 412         this.page = page;
 413         pstat = search_page_alloc_stat(&this, true);
 414         if (pstat == NULL)
 415                 return -ENOMEM;
 416
 417         pstat->nr_alloc++;
 418         pstat->alloc_bytes += bytes;
 419
 420         order_stats[order][migrate_type]++;
 421
 422         return 0;
 423 }
 424
 425 static int perf_evsel__process_page_free_event(struct perf_evsel *evsel,
 426                                                 struct perf_sample *sample)
 427 {
 428         u64 page;
 429         unsigned int order = perf_evsel__intval(evsel, sample, "order");
 430         u64 bytes = kmem_page_size << order;
 431         struct page_stat *pstat;
 432         struct page_stat this = {
 433                 .order = order,
 434         };
 435
 436         if (use_pfn)
 437                 page = perf_evsel__intval(evsel, sample, "pfn");
 438         else
 439                 page = perf_evsel__intval(evsel, sample, "page");
 440
 441         nr_page_frees++;
 442         total_page_free_bytes += bytes;
 443
 444         pstat = search_page(page, false);
 445         if (pstat == NULL) {
 446                 pr_debug2("missing free at page %"PRIx64" (order: %d)\n",
 447                           page, order);
 448
 449                 nr_page_nomatch++;
 450                 total_page_nomatch_bytes += bytes;
 451
 452                 return 0;
 453         }
 454
 455         this.page = page;
 456         this.gfp_flags = pstat->gfp_flags;
 457         this.migrate_type = pstat->migrate_type;
 458
 459         rb_erase(&pstat->node, &page_tree);
 460         free(pstat);
 461
 462         pstat = search_page_alloc_stat(&this, false);
 463         if (pstat == NULL)
 464                 return -ENOENT;
 465
 466         pstat->nr_free++;
 467         pstat->free_bytes += bytes;
 468
 469         return 0;
 470 }
 471
 472 typedef int (*tracepoint_handler)(struct perf_evsel *evsel,
 473                                   struct perf_sample *sample);
 474
 475 static int process_sample_event(struct perf_tool *tool __maybe_unused,
 476                                 union perf_event *event,
 477                                 struct perf_sample *sample,
 478                                 struct perf_evsel *evsel,
 479                                 struct machine *machine)
 480 {
 481         struct thread *thread = machine__findnew_thread(machine, sample->pid,
 482                                                         sample->tid);
 483
 484         if (thread == NULL) {
 485                 pr_debug("problem processing %d event, skipping it.\n",
 486                          event->header.type);
 487                 return -1;
 488         }
 489
 490         dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
 491
 492         if (evsel->handler != NULL) {
 493                 tracepoint_handler f = evsel->handler;
 494                 return f(evsel, sample);
 495         }
 496
 497         return 0;
 498 }
 499
 500 static struct perf_tool perf_kmem = {
 501         .sample          = process_sample_event,
 502         .comm            = perf_event__process_comm,
 503         .mmap            = perf_event__process_mmap,
 504         .mmap2           = perf_event__process_mmap2,
 505         .ordered_events  = true,
 506 };
 507
 508 static double fragmentation(unsigned long n_req, unsigned long n_alloc)
 509 {
 510         if (n_alloc == 0)
 511                 return 0.0;
 512         else
 513                 return 100.0 - (100.0 * n_req / n_alloc);
 514 }
 515
 516 static void __print_slab_result(struct rb_root *root,
 517                                 struct perf_session *session,
 518                                 int n_lines, int is_caller)
 519 {
 520         struct rb_node *next;
 521         struct machine *machine = &session->machines.host;
 522
 523         printf("%.105s\n", graph_dotted_line);
 524         printf(" %-34s |",  is_caller ? "Callsite": "Alloc Ptr");
 525         printf(" Total_alloc/Per | Total_req/Per   | Hit      | Ping-pong | Frag\n");
 526         printf("%.105s\n", graph_dotted_line);
 527
 528         next = rb_first(root);
 529
 530         while (next && n_lines--) {
 531                 struct alloc_stat *data = rb_entry(next, struct alloc_stat,
 532                                                    node);
 533                 struct symbol *sym = NULL;
 534                 struct map *map;
 535                 char buf[BUFSIZ];
 536                 u64 addr;
 537
 538                 if (is_caller) {
 539                         addr = data->call_site;
 540                         if (!raw_ip)
 541                                 sym = machine__find_kernel_function(machine, addr, &map, NULL);
 542                 } else
 543                         addr = data->ptr;
 544
 545                 if (sym != NULL)
 546                         snprintf(buf, sizeof(buf), "%s+%" PRIx64 "", sym->name,
 547                                  addr - map->unmap_ip(map, sym->start));
 548                 else
 549                         snprintf(buf, sizeof(buf), "%#" PRIx64 "", addr);
 550                 printf(" %-34s |", buf);
 551
 552                 printf(" %9llu/%-5lu | %9llu/%-5lu | %8lu | %9lu | %6.3f%%\n",
 553                        (unsigned long long)data->bytes_alloc,
 554                        (unsigned long)data->bytes_alloc / data->hit,
 555                        (unsigned long long)data->bytes_req,
 556                        (unsigned long)data->bytes_req / data->hit,
 557                        (unsigned long)data->hit,
 558                        (unsigned long)data->pingpong,
 559                        fragmentation(data->bytes_req, data->bytes_alloc));
 560
 561                 next = rb_next(next);
 562         }
 563
 564         if (n_lines == -1)
 565                 printf(" ...                                | ...             | ...             | ...      | ...       | ...   \n");
 566
 567         printf("%.105s\n", graph_dotted_line);
 568 }
 569
 570 static const char * const migrate_type_str[] = {
 571         "UNMOVABL",
 572         "RECLAIM",
 573         "MOVABLE",
 574         "RESERVED",
 575         "CMA/ISLT",
 576         "UNKNOWN",
 577 };
 578
 579 static void __print_page_result(struct rb_root *root,
 580                                 struct perf_session *session __maybe_unused,
 581                                 int n_lines)
 582 {
 583         struct rb_node *next = rb_first(root);
 584         const char *format;
 585
 586         printf("\n%.80s\n", graph_dotted_line);
 587         printf(" %-16s | Total alloc (KB) | Hits      | Order | Mig.type | GFP flags\n",
 588                use_pfn ? "PFN" : "Page");
 589         printf("%.80s\n", graph_dotted_line);
 590
 591         if (use_pfn)
 592                 format = " %16llu | %'16llu | %'9d | %5d | %8s |  %08lx\n";
 593         else
 594                 format = " %016llx | %'16llu | %'9d | %5d | %8s |  %08lx\n";
 595
 596         while (next && n_lines--) {
 597                 struct page_stat *data;
 598
 599                 data = rb_entry(next, struct page_stat, node);
 600
 601                 printf(format, (unsigned long long)data->page,
 602                        (unsigned long long)data->alloc_bytes / 1024,
 603                        data->nr_alloc, data->order,
 604                        migrate_type_str[data->migrate_type],
 605                        (unsigned long)data->gfp_flags);
 606
 607                 next = rb_next(next);
 608         }
 609
 610         if (n_lines == -1)
 611                 printf(" ...              | ...              | ...       | ...   | ...      | ...     \n");
 612
 613         printf("%.80s\n", graph_dotted_line);
 614 }
 615
 616 static void print_slab_summary(void)
 617 {
 618         printf("\nSUMMARY (SLAB allocator)");
 619         printf("\n========================\n");
 620         printf("Total bytes requested: %'lu\n", total_requested);
 621         printf("Total bytes allocated: %'lu\n", total_allocated);
 622         printf("Total bytes wasted on internal fragmentation: %'lu\n",
 623                total_allocated - total_requested);
 624         printf("Internal fragmentation: %f%%\n",
 625                fragmentation(total_requested, total_allocated));
 626         printf("Cross CPU allocations: %'lu/%'lu\n", nr_cross_allocs, nr_allocs);
 627 }
 628
 629 static void print_page_summary(void)
 630 {
 631         int o, m;
 632         u64 nr_alloc_freed = nr_page_frees - nr_page_nomatch;
 633         u64 total_alloc_freed_bytes = total_page_free_bytes - total_page_nomatch_bytes;
 634
 635         printf("\nSUMMARY (page allocator)");
 636         printf("\n========================\n");
 637         printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total allocation requests",
 638                nr_page_allocs, total_page_alloc_bytes / 1024);
 639         printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total free requests",
 640                nr_page_frees, total_page_free_bytes / 1024);
 641         printf("\n");
 642
 643         printf("%-30s: %'16"PRIu64"   [ %'16"PRIu64" KB ]\n", "Total alloc+freed requests",
 644                nr_alloc_freed, (total_alloc_freed_bytes) / 1024);
 645         printf("%-30s: %'16"PRIu64"   [ %'16"PRIu64" KB ]\n", "Total alloc-only requests",
 646                nr_page_allocs - nr_alloc_freed,
 647                (total_page_alloc_bytes - total_alloc_freed_bytes) / 1024);
 648         printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total free-only requests",
 649                nr_page_nomatch, total_page_nomatch_bytes / 1024);
 650         printf("\n");
 651
 652         printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total allocation failures",
 653                nr_page_fails, total_page_fail_bytes / 1024);
 654         printf("\n");
 655
 656         printf("%5s  %12s  %12s  %12s  %12s  %12s\n", "Order",  "Unmovable",
 657                "Reclaimable", "Movable", "Reserved", "CMA/Isolated");
 658         printf("%.5s  %.12s  %.12s  %.12s  %.12s  %.12s\n", graph_dotted_line,
 659                graph_dotted_line, graph_dotted_line, graph_dotted_line,
 660                graph_dotted_line, graph_dotted_line);
 661
 662         for (o = 0; o < MAX_PAGE_ORDER; o++) {
 663                 printf("%5d", o);
 664                 for (m = 0; m < MAX_MIGRATE_TYPES - 1; m++) {
 665                         if (order_stats[o][m])
 666                                 printf("  %'12d", order_stats[o][m]);
 667                         else
 668                                 printf("  %12c", '.');
 669                 }
 670                 printf("\n");
 671         }
 672 }
 673
 674 static void print_slab_result(struct perf_session *session)
 675 {
 676         if (caller_flag)
 677                 __print_slab_result(&root_caller_sorted, session, caller_lines, 1);
 678         if (alloc_flag)
 679                 __print_slab_result(&root_alloc_sorted, session, alloc_lines, 0);
 680         print_slab_summary();
 681 }
 682
 683 static void print_page_result(struct perf_session *session)
 684 {
 685         if (alloc_flag)
 686                 __print_page_result(&page_alloc_sorted, session, alloc_lines);
 687         print_page_summary();
 688 }
 689
 690 static void print_result(struct perf_session *session)
 691 {
 692         if (kmem_slab)
 693                 print_slab_result(session);
 694         if (kmem_page)
 695                 print_page_result(session);
 696 }
 697
 698 struct sort_dimension {
 699         const char              name[20];
 700         sort_fn_t               cmp;
 701         struct list_head        list;
 702 };
 703
 704 static LIST_HEAD(caller_sort);
 705 static LIST_HEAD(alloc_sort);
 706
 707 static void sort_slab_insert(struct rb_root *root, struct alloc_stat *data,
 708                              struct list_head *sort_list)
 709 {
 710         struct rb_node **new = &(root->rb_node);
 711         struct rb_node *parent = NULL;
 712         struct sort_dimension *sort;
 713
 714         while (*new) {
 715                 struct alloc_stat *this;
 716                 int cmp = 0;
 717
 718                 this = rb_entry(*new, struct alloc_stat, node);
 719                 parent = *new;
 720
 721                 list_for_each_entry(sort, sort_list, list) {
 722                         cmp = sort->cmp(data, this);
 723                         if (cmp)
 724                                 break;
 725                 }
 726
 727                 if (cmp > 0)
 728                         new = &((*new)->rb_left);
 729                 else
 730                         new = &((*new)->rb_right);
 731         }
 732
 733         rb_link_node(&data->node, parent, new);
 734         rb_insert_color(&data->node, root);
 735 }
 736
 737 static void __sort_slab_result(struct rb_root *root, struct rb_root *root_sorted,
 738                                struct list_head *sort_list)
 739 {
 740         struct rb_node *node;
 741         struct alloc_stat *data;
 742
 743         for (;;) {
 744                 node = rb_first(root);
 745                 if (!node)
 746                         break;
 747
 748                 rb_erase(node, root);
 749                 data = rb_entry(node, struct alloc_stat, node);
 750                 sort_slab_insert(root_sorted, data, sort_list);
 751         }
 752 }
 753
 754 static void sort_page_insert(struct rb_root *root, struct page_stat *data)
 755 {
 756         struct rb_node **new = &root->rb_node;
 757         struct rb_node *parent = NULL;
 758
 759         while (*new) {
 760                 struct page_stat *this;
 761                 int cmp = 0;
 762
 763                 this = rb_entry(*new, struct page_stat, node);
 764                 parent = *new;
 765
 766                 /* TODO: support more sort key */
 767                 cmp = data->alloc_bytes - this->alloc_bytes;
 768
 769                 if (cmp > 0)
 770                         new = &parent->rb_left;
 771                 else
 772                         new = &parent->rb_right;
 773         }
 774
 775         rb_link_node(&data->node, parent, new);
 776         rb_insert_color(&data->node, root);
 777 }
 778
 779 static void __sort_page_result(struct rb_root *root, struct rb_root *root_sorted)
 780 {
 781         struct rb_node *node;
 782         struct page_stat *data;
 783
 784         for (;;) {
 785                 node = rb_first(root);
 786                 if (!node)
 787                         break;
 788
 789                 rb_erase(node, root);
 790                 data = rb_entry(node, struct page_stat, node);
 791                 sort_page_insert(root_sorted, data);
 792         }
 793 }
 794
 795 static void sort_result(void)
 796 {
 797         if (kmem_slab) {
 798                 __sort_slab_result(&root_alloc_stat, &root_alloc_sorted,
 799                                    &alloc_sort);
 800                 __sort_slab_result(&root_caller_stat, &root_caller_sorted,
 801                                    &caller_sort);
 802         }
 803         if (kmem_page) {
 804                 __sort_page_result(&page_alloc_tree, &page_alloc_sorted);
 805         }
 806 }
 807
 808 static int __cmd_kmem(struct perf_session *session)
 809 {
 810         int err = -EINVAL;
 811         struct perf_evsel *evsel;
 812         const struct perf_evsel_str_handler kmem_tracepoints[] = {
 813                 /* slab allocator */
 814                 { "kmem:kmalloc",               perf_evsel__process_alloc_event, },
 815                 { "kmem:kmem_cache_alloc",      perf_evsel__process_alloc_event, },
 816                 { "kmem:kmalloc_node",          perf_evsel__process_alloc_node_event, },
 817                 { "kmem:kmem_cache_alloc_node", perf_evsel__process_alloc_node_event, },
 818                 { "kmem:kfree",                 perf_evsel__process_free_event, },
 819                 { "kmem:kmem_cache_free",       perf_evsel__process_free_event, },
 820                 /* page allocator */
 821                 { "kmem:mm_page_alloc",         perf_evsel__process_page_alloc_event, },
 822                 { "kmem:mm_page_free",          perf_evsel__process_page_free_event, },
 823         };
 824
 825         if (!perf_session__has_traces(session, "kmem record"))
 826                 goto out;
 827
 828         if (perf_session__set_tracepoints_handlers(session, kmem_tracepoints)) {
 829                 pr_err("Initializing perf session tracepoint handlers failed\n");
 830                 goto out;
 831         }
 832
 833         evlist__for_each(session->evlist, evsel) {
 834                 if (!strcmp(perf_evsel__name(evsel), "kmem:mm_page_alloc") &&
 835                     perf_evsel__field(evsel, "pfn")) {
 836                         use_pfn = true;
 837                         break;
 838                 }
 839         }
 840
 841         setup_pager();
 842         err = perf_session__process_events(session);
 843         if (err != 0) {
 844                 pr_err("error during process events: %d\n", err);
 845                 goto out;
 846         }
 847         sort_result();
 848         print_result(session);
 849 out:
 850         return err;
 851 }
 852
 853 static int ptr_cmp(struct alloc_stat *l, struct alloc_stat *r)
 854 {
 855         if (l->ptr < r->ptr)
 856                 return -1;
 857         else if (l->ptr > r->ptr)
 858                 return 1;
 859         return 0;
 860 }
 861
 862 static struct sort_dimension ptr_sort_dimension = {
 863         .name   = "ptr",
 864         .cmp    = ptr_cmp,
 865 };
 866
 867 static int callsite_cmp(struct alloc_stat *l, struct alloc_stat *r)
 868 {
 869         if (l->call_site < r->call_site)
 870                 return -1;
 871         else if (l->call_site > r->call_site)
 872                 return 1;
 873         return 0;
 874 }
 875
 876 static struct sort_dimension callsite_sort_dimension = {
 877         .name   = "callsite",
 878         .cmp    = callsite_cmp,
 879 };
 880
 881 static int hit_cmp(struct alloc_stat *l, struct alloc_stat *r)
 882 {
 883         if (l->hit < r->hit)
 884                 return -1;
 885         else if (l->hit > r->hit)
 886                 return 1;
 887         return 0;
 888 }
 889
 890 static struct sort_dimension hit_sort_dimension = {
 891         .name   = "hit",
 892         .cmp    = hit_cmp,
 893 };
 894
 895 static int bytes_cmp(struct alloc_stat *l, struct alloc_stat *r)
 896 {
 897         if (l->bytes_alloc < r->bytes_alloc)
 898                 return -1;
 899         else if (l->bytes_alloc > r->bytes_alloc)
 900                 return 1;
 901         return 0;
 902 }
 903
 904 static struct sort_dimension bytes_sort_dimension = {
 905         .name   = "bytes",
 906         .cmp    = bytes_cmp,
 907 };
 908
 909 static int frag_cmp(struct alloc_stat *l, struct alloc_stat *r)
 910 {
 911         double x, y;
 912
 913         x = fragmentation(l->bytes_req, l->bytes_alloc);
 914         y = fragmentation(r->bytes_req, r->bytes_alloc);
 915
 916         if (x < y)
 917                 return -1;
 918         else if (x > y)
 919                 return 1;
 920         return 0;
 921 }
 922
 923 static struct sort_dimension frag_sort_dimension = {
 924         .name   = "frag",
 925         .cmp    = frag_cmp,
 926 };
 927
 928 static int pingpong_cmp(struct alloc_stat *l, struct alloc_stat *r)
 929 {
 930         if (l->pingpong < r->pingpong)
 931                 return -1;
 932         else if (l->pingpong > r->pingpong)
 933                 return 1;
 934         return 0;
 935 }
 936
 937 static struct sort_dimension pingpong_sort_dimension = {
 938         .name   = "pingpong",
 939         .cmp    = pingpong_cmp,
 940 };
 941
 942 static struct sort_dimension *avail_sorts[] = {
 943         &ptr_sort_dimension,
 944         &callsite_sort_dimension,
 945         &hit_sort_dimension,
 946         &bytes_sort_dimension,
 947         &frag_sort_dimension,
 948         &pingpong_sort_dimension,
 949 };
 950
 951 #define NUM_AVAIL_SORTS ((int)ARRAY_SIZE(avail_sorts))
 952
 953 static int sort_dimension__add(const char *tok, struct list_head *list)
 954 {
 955         struct sort_dimension *sort;
 956         int i;
 957
 958         for (i = 0; i < NUM_AVAIL_SORTS; i++) {
 959                 if (!strcmp(avail_sorts[i]->name, tok)) {
 960                         sort = memdup(avail_sorts[i], sizeof(*avail_sorts[i]));
 961                         if (!sort) {
 962                                 pr_err("%s: memdup failed\n", __func__);
 963                                 return -1;
 964                         }
 965                         list_add_tail(&sort->list, list);
 966                         return 0;
 967                 }
 968         }
 969
 970         return -1;
 971 }
 972
 973 static int setup_sorting(struct list_head *sort_list, const char *arg)
 974 {
 975         char *tok;
 976         char *str = strdup(arg);
 977         char *pos = str;
 978
 979         if (!str) {
 980                 pr_err("%s: strdup failed\n", __func__);
 981                 return -1;
 982         }
 983
 984         while (true) {
 985                 tok = strsep(&pos, ",");
 986                 if (!tok)
 987                         break;
 988                 if (sort_dimension__add(tok, sort_list) < 0) {
 989                         error("Unknown --sort key: '%s'", tok);
 990                         free(str);
 991                         return -1;
 992                 }
 993         }
 994
 995         free(str);
 996         return 0;
 997 }
 998
 999 static int parse_sort_opt(const struct option *opt __maybe_unused,
1000                           const char *arg, int unset __maybe_unused)
1001 {
1002         if (!arg)
1003                 return -1;
1004
1005         if (caller_flag > alloc_flag)
1006                 return setup_sorting(&caller_sort, arg);
1007         else
1008                 return setup_sorting(&alloc_sort, arg);
1009
1010         return 0;
1011 }
1012
1013 static int parse_caller_opt(const struct option *opt __maybe_unused,
1014                             const char *arg __maybe_unused,
1015                             int unset __maybe_unused)
1016 {
1017         caller_flag = (alloc_flag + 1);
1018         return 0;
1019 }
1020
1021 static int parse_alloc_opt(const struct option *opt __maybe_unused,
1022                            const char *arg __maybe_unused,
1023                            int unset __maybe_unused)
1024 {
1025         alloc_flag = (caller_flag + 1);
1026         return 0;
1027 }
1028
1029 static int parse_slab_opt(const struct option *opt __maybe_unused,
1030                           const char *arg __maybe_unused,
1031                           int unset __maybe_unused)
1032 {
1033         kmem_slab = (kmem_page + 1);
1034         return 0;
1035 }
1036
1037 static int parse_page_opt(const struct option *opt __maybe_unused,
1038                           const char *arg __maybe_unused,
1039                           int unset __maybe_unused)
1040 {
1041         kmem_page = (kmem_slab + 1);
1042         return 0;
1043 }
1044
1045 static int parse_line_opt(const struct option *opt __maybe_unused,
1046                           const char *arg, int unset __maybe_unused)
1047 {
1048         int lines;
1049
1050         if (!arg)
1051                 return -1;
1052
1053         lines = strtoul(arg, NULL, 10);
1054
1055         if (caller_flag > alloc_flag)
1056                 caller_lines = lines;
1057         else
1058                 alloc_lines = lines;
1059
1060         return 0;
1061 }
1062
1063 static int __cmd_record(int argc, const char **argv)
1064 {
1065         const char * const record_args[] = {
1066         "record", "-a", "-R", "-c", "1",
1067         };
1068         const char * const slab_events[] = {
1069         "-e", "kmem:kmalloc",
1070         "-e", "kmem:kmalloc_node",
1071         "-e", "kmem:kfree",
1072         "-e", "kmem:kmem_cache_alloc",
1073         "-e", "kmem:kmem_cache_alloc_node",
1074         "-e", "kmem:kmem_cache_free",
1075         };
1076         const char * const page_events[] = {
1077         "-e", "kmem:mm_page_alloc",
1078         "-e", "kmem:mm_page_free",
1079         };
1080         unsigned int rec_argc, i, j;
1081         const char **rec_argv;
1082
1083         rec_argc = ARRAY_SIZE(record_args) + argc - 1;
1084         if (kmem_slab)
1085                 rec_argc += ARRAY_SIZE(slab_events);
1086         if (kmem_page)
1087                 rec_argc += ARRAY_SIZE(page_events);
1088
1089         rec_argv = calloc(rec_argc + 1, sizeof(char *));
1090
1091         if (rec_argv == NULL)
1092                 return -ENOMEM;
1093
1094         for (i = 0; i < ARRAY_SIZE(record_args); i++)
1095                 rec_argv[i] = strdup(record_args[i]);
1096
1097         if (kmem_slab) {
1098                 for (j = 0; j < ARRAY_SIZE(slab_events); j++, i++)
1099                         rec_argv[i] = strdup(slab_events[j]);
1100         }
1101         if (kmem_page) {
1102                 for (j = 0; j < ARRAY_SIZE(page_events); j++, i++)
1103                         rec_argv[i] = strdup(page_events[j]);
1104         }
1105
1106         for (j = 1; j < (unsigned int)argc; j++, i++)
1107                 rec_argv[i] = argv[j];
1108
1109         return cmd_record(i, rec_argv, NULL);
1110 }
1111
1112 int cmd_kmem(int argc, const char **argv, const char *prefix __maybe_unused)
1113 {
1114         const char * const default_sort_order = "frag,hit,bytes";
1115         struct perf_data_file file = {
1116                 .mode = PERF_DATA_MODE_READ,
1117         };
1118         const struct option kmem_options[] = {
1119         OPT_STRING('i', "input", &input_name, "file", "input file name"),
1120         OPT_INCR('v', "verbose", &verbose,
1121                     "be more verbose (show symbol address, etc)"),
1122         OPT_CALLBACK_NOOPT(0, "caller", NULL, NULL,
1123                            "show per-callsite statistics", parse_caller_opt),
1124         OPT_CALLBACK_NOOPT(0, "alloc", NULL, NULL,
1125                            "show per-allocation statistics", parse_alloc_opt),
1126         OPT_CALLBACK('s', "sort", NULL, "key[,key2...]",
1127                      "sort by keys: ptr, call_site, bytes, hit, pingpong, frag",
1128                      parse_sort_opt),
1129         OPT_CALLBACK('l', "line", NULL, "num", "show n lines", parse_line_opt),
1130         OPT_BOOLEAN(0, "raw-ip", &raw_ip, "show raw ip instead of symbol"),
1131         OPT_BOOLEAN('f', "force", &file.force, "don't complain, do it"),
1132         OPT_CALLBACK_NOOPT(0, "slab", NULL, NULL, "Analyze slab allocator",
1133                            parse_slab_opt),
1134         OPT_CALLBACK_NOOPT(0, "page", NULL, NULL, "Analyze page allocator",
1135                            parse_page_opt),
1136         OPT_END()
1137         };
1138         const char *const kmem_subcommands[] = { "record", "stat", NULL };
1139         const char *kmem_usage[] = {
1140                 NULL,
1141                 NULL
1142         };
1143         struct perf_session *session;
1144         int ret = -1;
1145
1146         argc = parse_options_subcommand(argc, argv, kmem_options,
1147                                         kmem_subcommands, kmem_usage, 0);
1148
1149         if (!argc)
1150                 usage_with_options(kmem_usage, kmem_options);
1151
1152         if (kmem_slab == 0 && kmem_page == 0)
1153                 kmem_slab = 1;  /* for backward compatibility */
1154
1155         if (!strncmp(argv[0], "rec", 3)) {
1156                 symbol__init(NULL);
1157                 return __cmd_record(argc, argv);
1158         }
1159
1160         file.path = input_name;
1161
1162         session = perf_session__new(&file, false, &perf_kmem);
1163         if (session == NULL)
1164                 return -1;
1165
1166         if (kmem_page) {
1167                 struct perf_evsel *evsel = perf_evlist__first(session->evlist);
1168
1169                 if (evsel == NULL || evsel->tp_format == NULL) {
1170                         pr_err("invalid event found.. aborting\n");
1171                         return -1;
1172                 }
1173
1174                 kmem_page_size = pevent_get_page_size(evsel->tp_format->pevent);
1175         }
1176
1177         symbol__init(&session->header.env);
1178
1179         if (!strcmp(argv[0], "stat")) {
1180                 setlocale(LC_ALL, "");
1181
1182                 if (cpu__setup_cpunode_map())
1183                         goto out_delete;
1184
1185                 if (list_empty(&caller_sort))
1186                         setup_sorting(&caller_sort, default_sort_order);
1187                 if (list_empty(&alloc_sort))
1188                         setup_sorting(&alloc_sort, default_sort_order);
1189
1190                 ret = __cmd_kmem(session);
1191         } else
1192                 usage_with_options(kmem_usage, kmem_options);
1193
1194 out_delete:
1195         perf_session__delete(session);
1196
1197         return ret;
1198 }
1199