1// SPDX-License-Identifier: GPL-2.0
   2#include "builtin.h"
   3#include "perf.h"
   4
   5#include "util/dso.h"
   6#include "util/evlist.h"
   7#include "util/evsel.h"
   8#include "util/config.h"
   9#include "util/map.h"
  10#include "util/symbol.h"
  11#include "util/thread.h"
  12#include "util/header.h"
  13#include "util/session.h"
  14#include "util/tool.h"
  15#include "util/callchain.h"
  16#include "util/time-utils.h"
  17#include <linux/err.h>
  18
  19#include <subcmd/pager.h>
  20#include <subcmd/parse-options.h>
  21#include "util/trace-event.h"
  22#include "util/data.h"
  23#include "util/cpumap.h"
  24
  25#include "util/debug.h"
  26#include "util/string2.h"
 
  27
  28#include <linux/kernel.h>
  29#include <linux/numa.h>
  30#include <linux/rbtree.h>
  31#include <linux/string.h>
  32#include <linux/zalloc.h>
  33#include <errno.h>
  34#include <inttypes.h>
  35#include <locale.h>
  36#include <regex.h>
  37
  38#include <linux/ctype.h>
  39#include <traceevent/event-parse.h>
  40
  41static int	kmem_slab;
  42static int	kmem_page;
  43
  44static long	kmem_page_size;
  45static enum {
  46	KMEM_SLAB,
  47	KMEM_PAGE,
  48} kmem_default = KMEM_SLAB;  /* for backward compatibility */
  49
  50struct alloc_stat;
  51typedef int (*sort_fn_t)(void *, void *);
  52
  53static int			alloc_flag;
  54static int			caller_flag;
  55
  56static int			alloc_lines = -1;
  57static int			caller_lines = -1;
  58
  59static bool			raw_ip;
  60
  61struct alloc_stat {
  62	u64	call_site;
  63	u64	ptr;
  64	u64	bytes_req;
  65	u64	bytes_alloc;
  66	u64	last_alloc;
  67	u32	hit;
  68	u32	pingpong;
  69
  70	short	alloc_cpu;
  71
  72	struct rb_node node;
  73};
  74
  75static struct rb_root root_alloc_stat;
  76static struct rb_root root_alloc_sorted;
  77static struct rb_root root_caller_stat;
  78static struct rb_root root_caller_sorted;
  79
  80static unsigned long total_requested, total_allocated, total_freed;
  81static unsigned long nr_allocs, nr_cross_allocs;
  82
  83/* filters for controlling start and stop of time of analysis */
  84static struct perf_time_interval ptime;
  85const char *time_str;
  86
  87static int insert_alloc_stat(unsigned long call_site, unsigned long ptr,
  88			     int bytes_req, int bytes_alloc, int cpu)
  89{
  90	struct rb_node **node = &root_alloc_stat.rb_node;
  91	struct rb_node *parent = NULL;
  92	struct alloc_stat *data = NULL;
  93
  94	while (*node) {
  95		parent = *node;
  96		data = rb_entry(*node, struct alloc_stat, node);
  97
  98		if (ptr > data->ptr)
  99			node = &(*node)->rb_right;
 100		else if (ptr < data->ptr)
 101			node = &(*node)->rb_left;
 102		else
 103			break;
 104	}
 105
 106	if (data && data->ptr == ptr) {
 107		data->hit++;
 108		data->bytes_req += bytes_req;
 109		data->bytes_alloc += bytes_alloc;
 110	} else {
 111		data = malloc(sizeof(*data));
 112		if (!data) {
 113			pr_err("%s: malloc failed\n", __func__);
 114			return -1;
 115		}
 116		data->ptr = ptr;
 117		data->pingpong = 0;
 118		data->hit = 1;
 119		data->bytes_req = bytes_req;
 120		data->bytes_alloc = bytes_alloc;
 121
 122		rb_link_node(&data->node, parent, node);
 123		rb_insert_color(&data->node, &root_alloc_stat);
 124	}
 125	data->call_site = call_site;
 126	data->alloc_cpu = cpu;
 127	data->last_alloc = bytes_alloc;
 128
 129	return 0;
 130}
 131
 132static int insert_caller_stat(unsigned long call_site,
 133			      int bytes_req, int bytes_alloc)
 134{
 135	struct rb_node **node = &root_caller_stat.rb_node;
 136	struct rb_node *parent = NULL;
 137	struct alloc_stat *data = NULL;
 138
 139	while (*node) {
 140		parent = *node;
 141		data = rb_entry(*node, struct alloc_stat, node);
 142
 143		if (call_site > data->call_site)
 144			node = &(*node)->rb_right;
 145		else if (call_site < data->call_site)
 146			node = &(*node)->rb_left;
 147		else
 148			break;
 149	}
 150
 151	if (data && data->call_site == call_site) {
 152		data->hit++;
 153		data->bytes_req += bytes_req;
 154		data->bytes_alloc += bytes_alloc;
 155	} else {
 156		data = malloc(sizeof(*data));
 157		if (!data) {
 158			pr_err("%s: malloc failed\n", __func__);
 159			return -1;
 160		}
 161		data->call_site = call_site;
 162		data->pingpong = 0;
 163		data->hit = 1;
 164		data->bytes_req = bytes_req;
 165		data->bytes_alloc = bytes_alloc;
 166
 167		rb_link_node(&data->node, parent, node);
 168		rb_insert_color(&data->node, &root_caller_stat);
 169	}
 170
 171	return 0;
 172}
 173
 174static int evsel__process_alloc_event(struct evsel *evsel, struct perf_sample *sample)
 175{
 176	unsigned long ptr = evsel__intval(evsel, sample, "ptr"),
 177		      call_site = evsel__intval(evsel, sample, "call_site");
 178	int bytes_req = evsel__intval(evsel, sample, "bytes_req"),
 179	    bytes_alloc = evsel__intval(evsel, sample, "bytes_alloc");
 180
 181	if (insert_alloc_stat(call_site, ptr, bytes_req, bytes_alloc, sample->cpu) ||
 182	    insert_caller_stat(call_site, bytes_req, bytes_alloc))
 183		return -1;
 184
 185	total_requested += bytes_req;
 186	total_allocated += bytes_alloc;
 187
 188	nr_allocs++;
 189
 190	/*
 191	 * Commit 11e9734bcb6a ("mm/slab_common: unify NUMA and UMA
 192	 * version of tracepoints") adds the field "node" into the
 193	 * tracepoints 'kmalloc' and 'kmem_cache_alloc'.
 194	 *
 195	 * The legacy tracepoints 'kmalloc_node' and 'kmem_cache_alloc_node'
 196	 * also contain the field "node".
 197	 *
 198	 * If the tracepoint contains the field "node" the tool stats the
 199	 * cross allocation.
 200	 */
 201	if (evsel__field(evsel, "node")) {
 202		int node1, node2;
 203
 204		node1 = cpu__get_node((struct perf_cpu){.cpu = sample->cpu});
 205		node2 = evsel__intval(evsel, sample, "node");
 206
 207		/*
 208		 * If the field "node" is NUMA_NO_NODE (-1), we don't take it
 209		 * as a cross allocation.
 210		 */
 211		if ((node2 != NUMA_NO_NODE) && (node1 != node2))
 212			nr_cross_allocs++;
 213	}
 214
 215	return 0;
 216}
 217
 218static int ptr_cmp(void *, void *);
 219static int slab_callsite_cmp(void *, void *);
 220
 221static struct alloc_stat *search_alloc_stat(unsigned long ptr,
 222					    unsigned long call_site,
 223					    struct rb_root *root,
 224					    sort_fn_t sort_fn)
 225{
 226	struct rb_node *node = root->rb_node;
 227	struct alloc_stat key = { .ptr = ptr, .call_site = call_site };
 228
 229	while (node) {
 230		struct alloc_stat *data;
 231		int cmp;
 232
 233		data = rb_entry(node, struct alloc_stat, node);
 234
 235		cmp = sort_fn(&key, data);
 236		if (cmp < 0)
 237			node = node->rb_left;
 238		else if (cmp > 0)
 239			node = node->rb_right;
 240		else
 241			return data;
 242	}
 243	return NULL;
 244}
 245
 246static int evsel__process_free_event(struct evsel *evsel, struct perf_sample *sample)
 247{
 248	unsigned long ptr = evsel__intval(evsel, sample, "ptr");
 249	struct alloc_stat *s_alloc, *s_caller;
 250
 251	s_alloc = search_alloc_stat(ptr, 0, &root_alloc_stat, ptr_cmp);
 252	if (!s_alloc)
 253		return 0;
 254
 255	total_freed += s_alloc->last_alloc;
 256
 257	if ((short)sample->cpu != s_alloc->alloc_cpu) {
 258		s_alloc->pingpong++;
 259
 260		s_caller = search_alloc_stat(0, s_alloc->call_site,
 261					     &root_caller_stat,
 262					     slab_callsite_cmp);
 263		if (!s_caller)
 264			return -1;
 265		s_caller->pingpong++;
 266	}
 267	s_alloc->alloc_cpu = -1;
 268
 269	return 0;
 270}
 271
 272static u64 total_page_alloc_bytes;
 273static u64 total_page_free_bytes;
 274static u64 total_page_nomatch_bytes;
 275static u64 total_page_fail_bytes;
 276static unsigned long nr_page_allocs;
 277static unsigned long nr_page_frees;
 278static unsigned long nr_page_fails;
 279static unsigned long nr_page_nomatch;
 280
 281static bool use_pfn;
 282static bool live_page;
 283static struct perf_session *kmem_session;
 284
 285#define MAX_MIGRATE_TYPES  6
 286#define MAX_PAGE_ORDER     11
 287
 288static int order_stats[MAX_PAGE_ORDER][MAX_MIGRATE_TYPES];
 289
 290struct page_stat {
 291	struct rb_node 	node;
 292	u64 		page;
 293	u64 		callsite;
 294	int 		order;
 295	unsigned 	gfp_flags;
 296	unsigned 	migrate_type;
 297	u64		alloc_bytes;
 298	u64 		free_bytes;
 299	int 		nr_alloc;
 300	int 		nr_free;
 301};
 302
 303static struct rb_root page_live_tree;
 304static struct rb_root page_alloc_tree;
 305static struct rb_root page_alloc_sorted;
 306static struct rb_root page_caller_tree;
 307static struct rb_root page_caller_sorted;
 308
 309struct alloc_func {
 310	u64 start;
 311	u64 end;
 312	char *name;
 313};
 314
 315static int nr_alloc_funcs;
 316static struct alloc_func *alloc_func_list;
 317
 318static int funcmp(const void *a, const void *b)
 319{
 320	const struct alloc_func *fa = a;
 321	const struct alloc_func *fb = b;
 322
 323	if (fa->start > fb->start)
 324		return 1;
 325	else
 326		return -1;
 327}
 328
 329static int callcmp(const void *a, const void *b)
 330{
 331	const struct alloc_func *fa = a;
 332	const struct alloc_func *fb = b;
 333
 334	if (fb->start <= fa->start && fa->end < fb->end)
 335		return 0;
 336
 337	if (fa->start > fb->start)
 338		return 1;
 339	else
 340		return -1;
 341}
 342
 343static int build_alloc_func_list(void)
 344{
 345	int ret;
 346	struct map *kernel_map;
 347	struct symbol *sym;
 348	struct rb_node *node;
 349	struct alloc_func *func;
 350	struct machine *machine = &kmem_session->machines.host;
 351	regex_t alloc_func_regex;
 352	static const char pattern[] = "^_?_?(alloc|get_free|get_zeroed)_pages?";
 353
 354	ret = regcomp(&alloc_func_regex, pattern, REG_EXTENDED);
 355	if (ret) {
 356		char err[BUFSIZ];
 357
 358		regerror(ret, &alloc_func_regex, err, sizeof(err));
 359		pr_err("Invalid regex: %s\n%s", pattern, err);
 360		return -EINVAL;
 361	}
 362
 363	kernel_map = machine__kernel_map(machine);
 364	if (map__load(kernel_map) < 0) {
 365		pr_err("cannot load kernel map\n");
 366		return -ENOENT;
 367	}
 368
 369	map__for_each_symbol(kernel_map, sym, node) {
 370		if (regexec(&alloc_func_regex, sym->name, 0, NULL, 0))
 371			continue;
 372
 373		func = realloc(alloc_func_list,
 374			       (nr_alloc_funcs + 1) * sizeof(*func));
 375		if (func == NULL)
 376			return -ENOMEM;
 377
 378		pr_debug("alloc func: %s\n", sym->name);
 379		func[nr_alloc_funcs].start = sym->start;
 380		func[nr_alloc_funcs].end   = sym->end;
 381		func[nr_alloc_funcs].name  = sym->name;
 382
 383		alloc_func_list = func;
 384		nr_alloc_funcs++;
 385	}
 386
 387	qsort(alloc_func_list, nr_alloc_funcs, sizeof(*func), funcmp);
 388
 389	regfree(&alloc_func_regex);
 390	return 0;
 391}
 392
 393/*
 394 * Find first non-memory allocation function from callchain.
 395 * The allocation functions are in the 'alloc_func_list'.
 396 */
 397static u64 find_callsite(struct evsel *evsel, struct perf_sample *sample)
 398{
 399	struct addr_location al;
 400	struct machine *machine = &kmem_session->machines.host;
 401	struct callchain_cursor_node *node;
 
 
 402
 
 403	if (alloc_func_list == NULL) {
 404		if (build_alloc_func_list() < 0)
 405			goto out;
 406	}
 407
 408	al.thread = machine__findnew_thread(machine, sample->pid, sample->tid);
 409	sample__resolve_callchain(sample, &callchain_cursor, NULL, evsel, &al, 16);
 410
 411	callchain_cursor_commit(&callchain_cursor);
 
 
 
 
 
 
 412	while (true) {
 413		struct alloc_func key, *caller;
 414		u64 addr;
 415
 416		node = callchain_cursor_current(&callchain_cursor);
 417		if (node == NULL)
 418			break;
 419
 420		key.start = key.end = node->ip;
 421		caller = bsearch(&key, alloc_func_list, nr_alloc_funcs,
 422				 sizeof(key), callcmp);
 423		if (!caller) {
 424			/* found */
 425			if (node->ms.map)
 426				addr = map__unmap_ip(node->ms.map, node->ip);
 427			else
 428				addr = node->ip;
 429
 430			return addr;
 
 431		} else
 432			pr_debug3("skipping alloc function: %s\n", caller->name);
 433
 434		callchain_cursor_advance(&callchain_cursor);
 435	}
 436
 437out:
 438	pr_debug2("unknown callsite: %"PRIx64 "\n", sample->ip);
 439	return sample->ip;
 
 
 440}
 441
 442struct sort_dimension {
 443	const char		name[20];
 444	sort_fn_t		cmp;
 445	struct list_head	list;
 446};
 447
 448static LIST_HEAD(page_alloc_sort_input);
 449static LIST_HEAD(page_caller_sort_input);
 450
 451static struct page_stat *
 452__page_stat__findnew_page(struct page_stat *pstat, bool create)
 453{
 454	struct rb_node **node = &page_live_tree.rb_node;
 455	struct rb_node *parent = NULL;
 456	struct page_stat *data;
 457
 458	while (*node) {
 459		s64 cmp;
 460
 461		parent = *node;
 462		data = rb_entry(*node, struct page_stat, node);
 463
 464		cmp = data->page - pstat->page;
 465		if (cmp < 0)
 466			node = &parent->rb_left;
 467		else if (cmp > 0)
 468			node = &parent->rb_right;
 469		else
 470			return data;
 471	}
 472
 473	if (!create)
 474		return NULL;
 475
 476	data = zalloc(sizeof(*data));
 477	if (data != NULL) {
 478		data->page = pstat->page;
 479		data->order = pstat->order;
 480		data->gfp_flags = pstat->gfp_flags;
 481		data->migrate_type = pstat->migrate_type;
 482
 483		rb_link_node(&data->node, parent, node);
 484		rb_insert_color(&data->node, &page_live_tree);
 485	}
 486
 487	return data;
 488}
 489
 490static struct page_stat *page_stat__find_page(struct page_stat *pstat)
 491{
 492	return __page_stat__findnew_page(pstat, false);
 493}
 494
 495static struct page_stat *page_stat__findnew_page(struct page_stat *pstat)
 496{
 497	return __page_stat__findnew_page(pstat, true);
 498}
 499
 500static struct page_stat *
 501__page_stat__findnew_alloc(struct page_stat *pstat, bool create)
 502{
 503	struct rb_node **node = &page_alloc_tree.rb_node;
 504	struct rb_node *parent = NULL;
 505	struct page_stat *data;
 506	struct sort_dimension *sort;
 507
 508	while (*node) {
 509		int cmp = 0;
 510
 511		parent = *node;
 512		data = rb_entry(*node, struct page_stat, node);
 513
 514		list_for_each_entry(sort, &page_alloc_sort_input, list) {
 515			cmp = sort->cmp(pstat, data);
 516			if (cmp)
 517				break;
 518		}
 519
 520		if (cmp < 0)
 521			node = &parent->rb_left;
 522		else if (cmp > 0)
 523			node = &parent->rb_right;
 524		else
 525			return data;
 526	}
 527
 528	if (!create)
 529		return NULL;
 530
 531	data = zalloc(sizeof(*data));
 532	if (data != NULL) {
 533		data->page = pstat->page;
 534		data->order = pstat->order;
 535		data->gfp_flags = pstat->gfp_flags;
 536		data->migrate_type = pstat->migrate_type;
 537
 538		rb_link_node(&data->node, parent, node);
 539		rb_insert_color(&data->node, &page_alloc_tree);
 540	}
 541
 542	return data;
 543}
 544
 545static struct page_stat *page_stat__find_alloc(struct page_stat *pstat)
 546{
 547	return __page_stat__findnew_alloc(pstat, false);
 548}
 549
 550static struct page_stat *page_stat__findnew_alloc(struct page_stat *pstat)
 551{
 552	return __page_stat__findnew_alloc(pstat, true);
 553}
 554
 555static struct page_stat *
 556__page_stat__findnew_caller(struct page_stat *pstat, bool create)
 557{
 558	struct rb_node **node = &page_caller_tree.rb_node;
 559	struct rb_node *parent = NULL;
 560	struct page_stat *data;
 561	struct sort_dimension *sort;
 562
 563	while (*node) {
 564		int cmp = 0;
 565
 566		parent = *node;
 567		data = rb_entry(*node, struct page_stat, node);
 568
 569		list_for_each_entry(sort, &page_caller_sort_input, list) {
 570			cmp = sort->cmp(pstat, data);
 571			if (cmp)
 572				break;
 573		}
 574
 575		if (cmp < 0)
 576			node = &parent->rb_left;
 577		else if (cmp > 0)
 578			node = &parent->rb_right;
 579		else
 580			return data;
 581	}
 582
 583	if (!create)
 584		return NULL;
 585
 586	data = zalloc(sizeof(*data));
 587	if (data != NULL) {
 588		data->callsite = pstat->callsite;
 589		data->order = pstat->order;
 590		data->gfp_flags = pstat->gfp_flags;
 591		data->migrate_type = pstat->migrate_type;
 592
 593		rb_link_node(&data->node, parent, node);
 594		rb_insert_color(&data->node, &page_caller_tree);
 595	}
 596
 597	return data;
 598}
 599
 600static struct page_stat *page_stat__find_caller(struct page_stat *pstat)
 601{
 602	return __page_stat__findnew_caller(pstat, false);
 603}
 604
 605static struct page_stat *page_stat__findnew_caller(struct page_stat *pstat)
 606{
 607	return __page_stat__findnew_caller(pstat, true);
 608}
 609
 610static bool valid_page(u64 pfn_or_page)
 611{
 612	if (use_pfn && pfn_or_page == -1UL)
 613		return false;
 614	if (!use_pfn && pfn_or_page == 0)
 615		return false;
 616	return true;
 617}
 618
 619struct gfp_flag {
 620	unsigned int flags;
 621	char *compact_str;
 622	char *human_readable;
 623};
 624
 625static struct gfp_flag *gfps;
 626static int nr_gfps;
 627
 628static int gfpcmp(const void *a, const void *b)
 629{
 630	const struct gfp_flag *fa = a;
 631	const struct gfp_flag *fb = b;
 632
 633	return fa->flags - fb->flags;
 634}
 635
 636/* see include/trace/events/mmflags.h */
 637static const struct {
 638	const char *original;
 639	const char *compact;
 640} gfp_compact_table[] = {
 641	{ "GFP_TRANSHUGE",		"THP" },
 642	{ "GFP_TRANSHUGE_LIGHT",	"THL" },
 643	{ "GFP_HIGHUSER_MOVABLE",	"HUM" },
 644	{ "GFP_HIGHUSER",		"HU" },
 645	{ "GFP_USER",			"U" },
 646	{ "GFP_KERNEL_ACCOUNT",		"KAC" },
 647	{ "GFP_KERNEL",			"K" },
 648	{ "GFP_NOFS",			"NF" },
 649	{ "GFP_ATOMIC",			"A" },
 650	{ "GFP_NOIO",			"NI" },
 651	{ "GFP_NOWAIT",			"NW" },
 652	{ "GFP_DMA",			"D" },
 653	{ "__GFP_HIGHMEM",		"HM" },
 654	{ "GFP_DMA32",			"D32" },
 655	{ "__GFP_HIGH",			"H" },
 656	{ "__GFP_ATOMIC",		"_A" },
 657	{ "__GFP_IO",			"I" },
 658	{ "__GFP_FS",			"F" },
 659	{ "__GFP_NOWARN",		"NWR" },
 660	{ "__GFP_RETRY_MAYFAIL",	"R" },
 661	{ "__GFP_NOFAIL",		"NF" },
 662	{ "__GFP_NORETRY",		"NR" },
 663	{ "__GFP_COMP",			"C" },
 664	{ "__GFP_ZERO",			"Z" },
 665	{ "__GFP_NOMEMALLOC",		"NMA" },
 666	{ "__GFP_MEMALLOC",		"MA" },
 667	{ "__GFP_HARDWALL",		"HW" },
 668	{ "__GFP_THISNODE",		"TN" },
 669	{ "__GFP_RECLAIMABLE",		"RC" },
 670	{ "__GFP_MOVABLE",		"M" },
 671	{ "__GFP_ACCOUNT",		"AC" },
 672	{ "__GFP_WRITE",		"WR" },
 673	{ "__GFP_RECLAIM",		"R" },
 674	{ "__GFP_DIRECT_RECLAIM",	"DR" },
 675	{ "__GFP_KSWAPD_RECLAIM",	"KR" },
 676};
 677
 678static size_t max_gfp_len;
 679
 680static char *compact_gfp_flags(char *gfp_flags)
 681{
 682	char *orig_flags = strdup(gfp_flags);
 683	char *new_flags = NULL;
 684	char *str, *pos = NULL;
 685	size_t len = 0;
 686
 687	if (orig_flags == NULL)
 688		return NULL;
 689
 690	str = strtok_r(orig_flags, "|", &pos);
 691	while (str) {
 692		size_t i;
 693		char *new;
 694		const char *cpt;
 695
 696		for (i = 0; i < ARRAY_SIZE(gfp_compact_table); i++) {
 697			if (strcmp(gfp_compact_table[i].original, str))
 698				continue;
 699
 700			cpt = gfp_compact_table[i].compact;
 701			new = realloc(new_flags, len + strlen(cpt) + 2);
 702			if (new == NULL) {
 703				free(new_flags);
 704				free(orig_flags);
 705				return NULL;
 706			}
 707
 708			new_flags = new;
 709
 710			if (!len) {
 711				strcpy(new_flags, cpt);
 712			} else {
 713				strcat(new_flags, "|");
 714				strcat(new_flags, cpt);
 715				len++;
 716			}
 717
 718			len += strlen(cpt);
 719		}
 720
 721		str = strtok_r(NULL, "|", &pos);
 722	}
 723
 724	if (max_gfp_len < len)
 725		max_gfp_len = len;
 726
 727	free(orig_flags);
 728	return new_flags;
 729}
 730
 731static char *compact_gfp_string(unsigned long gfp_flags)
 732{
 733	struct gfp_flag key = {
 734		.flags = gfp_flags,
 735	};
 736	struct gfp_flag *gfp;
 737
 738	gfp = bsearch(&key, gfps, nr_gfps, sizeof(*gfps), gfpcmp);
 739	if (gfp)
 740		return gfp->compact_str;
 741
 742	return NULL;
 743}
 744
 745static int parse_gfp_flags(struct evsel *evsel, struct perf_sample *sample,
 746			   unsigned int gfp_flags)
 747{
 748	struct tep_record record = {
 749		.cpu = sample->cpu,
 750		.data = sample->raw_data,
 751		.size = sample->raw_size,
 752	};
 753	struct trace_seq seq;
 754	char *str, *pos = NULL;
 755
 756	if (nr_gfps) {
 757		struct gfp_flag key = {
 758			.flags = gfp_flags,
 759		};
 760
 761		if (bsearch(&key, gfps, nr_gfps, sizeof(*gfps), gfpcmp))
 762			return 0;
 763	}
 764
 765	trace_seq_init(&seq);
 766	tep_print_event(evsel->tp_format->tep,
 767			&seq, &record, "%s", TEP_PRINT_INFO);
 768
 769	str = strtok_r(seq.buffer, " ", &pos);
 770	while (str) {
 771		if (!strncmp(str, "gfp_flags=", 10)) {
 772			struct gfp_flag *new;
 773
 774			new = realloc(gfps, (nr_gfps + 1) * sizeof(*gfps));
 775			if (new == NULL)
 776				return -ENOMEM;
 777
 778			gfps = new;
 779			new += nr_gfps++;
 780
 781			new->flags = gfp_flags;
 782			new->human_readable = strdup(str + 10);
 783			new->compact_str = compact_gfp_flags(str + 10);
 784			if (!new->human_readable || !new->compact_str)
 785				return -ENOMEM;
 786
 787			qsort(gfps, nr_gfps, sizeof(*gfps), gfpcmp);
 788		}
 789
 790		str = strtok_r(NULL, " ", &pos);
 791	}
 792
 793	trace_seq_destroy(&seq);
 794	return 0;
 795}
 796
 797static int evsel__process_page_alloc_event(struct evsel *evsel, struct perf_sample *sample)
 798{
 799	u64 page;
 800	unsigned int order = evsel__intval(evsel, sample, "order");
 801	unsigned int gfp_flags = evsel__intval(evsel, sample, "gfp_flags");
 802	unsigned int migrate_type = evsel__intval(evsel, sample,
 803						       "migratetype");
 804	u64 bytes = kmem_page_size << order;
 805	u64 callsite;
 806	struct page_stat *pstat;
 807	struct page_stat this = {
 808		.order = order,
 809		.gfp_flags = gfp_flags,
 810		.migrate_type = migrate_type,
 811	};
 812
 813	if (use_pfn)
 814		page = evsel__intval(evsel, sample, "pfn");
 815	else
 816		page = evsel__intval(evsel, sample, "page");
 817
 818	nr_page_allocs++;
 819	total_page_alloc_bytes += bytes;
 820
 821	if (!valid_page(page)) {
 822		nr_page_fails++;
 823		total_page_fail_bytes += bytes;
 824
 825		return 0;
 826	}
 827
 828	if (parse_gfp_flags(evsel, sample, gfp_flags) < 0)
 829		return -1;
 830
 831	callsite = find_callsite(evsel, sample);
 832
 833	/*
 834	 * This is to find the current page (with correct gfp flags and
 835	 * migrate type) at free event.
 836	 */
 837	this.page = page;
 838	pstat = page_stat__findnew_page(&this);
 839	if (pstat == NULL)
 840		return -ENOMEM;
 841
 842	pstat->nr_alloc++;
 843	pstat->alloc_bytes += bytes;
 844	pstat->callsite = callsite;
 845
 846	if (!live_page) {
 847		pstat = page_stat__findnew_alloc(&this);
 848		if (pstat == NULL)
 849			return -ENOMEM;
 850
 851		pstat->nr_alloc++;
 852		pstat->alloc_bytes += bytes;
 853		pstat->callsite = callsite;
 854	}
 855
 856	this.callsite = callsite;
 857	pstat = page_stat__findnew_caller(&this);
 858	if (pstat == NULL)
 859		return -ENOMEM;
 860
 861	pstat->nr_alloc++;
 862	pstat->alloc_bytes += bytes;
 863
 864	order_stats[order][migrate_type]++;
 865
 866	return 0;
 867}
 868
 869static int evsel__process_page_free_event(struct evsel *evsel, struct perf_sample *sample)
 870{
 871	u64 page;
 872	unsigned int order = evsel__intval(evsel, sample, "order");
 873	u64 bytes = kmem_page_size << order;
 874	struct page_stat *pstat;
 875	struct page_stat this = {
 876		.order = order,
 877	};
 878
 879	if (use_pfn)
 880		page = evsel__intval(evsel, sample, "pfn");
 881	else
 882		page = evsel__intval(evsel, sample, "page");
 883
 884	nr_page_frees++;
 885	total_page_free_bytes += bytes;
 886
 887	this.page = page;
 888	pstat = page_stat__find_page(&this);
 889	if (pstat == NULL) {
 890		pr_debug2("missing free at page %"PRIx64" (order: %d)\n",
 891			  page, order);
 892
 893		nr_page_nomatch++;
 894		total_page_nomatch_bytes += bytes;
 895
 896		return 0;
 897	}
 898
 899	this.gfp_flags = pstat->gfp_flags;
 900	this.migrate_type = pstat->migrate_type;
 901	this.callsite = pstat->callsite;
 902
 903	rb_erase(&pstat->node, &page_live_tree);
 904	free(pstat);
 905
 906	if (live_page) {
 907		order_stats[this.order][this.migrate_type]--;
 908	} else {
 909		pstat = page_stat__find_alloc(&this);
 910		if (pstat == NULL)
 911			return -ENOMEM;
 912
 913		pstat->nr_free++;
 914		pstat->free_bytes += bytes;
 915	}
 916
 917	pstat = page_stat__find_caller(&this);
 918	if (pstat == NULL)
 919		return -ENOENT;
 920
 921	pstat->nr_free++;
 922	pstat->free_bytes += bytes;
 923
 924	if (live_page) {
 925		pstat->nr_alloc--;
 926		pstat->alloc_bytes -= bytes;
 927
 928		if (pstat->nr_alloc == 0) {
 929			rb_erase(&pstat->node, &page_caller_tree);
 930			free(pstat);
 931		}
 932	}
 933
 934	return 0;
 935}
 936
 937static bool perf_kmem__skip_sample(struct perf_sample *sample)
 938{
 939	/* skip sample based on time? */
 940	if (perf_time__skip_sample(&ptime, sample->time))
 941		return true;
 942
 943	return false;
 944}
 945
 946typedef int (*tracepoint_handler)(struct evsel *evsel,
 947				  struct perf_sample *sample);
 948
 949static int process_sample_event(struct perf_tool *tool __maybe_unused,
 950				union perf_event *event,
 951				struct perf_sample *sample,
 952				struct evsel *evsel,
 953				struct machine *machine)
 954{
 955	int err = 0;
 956	struct thread *thread = machine__findnew_thread(machine, sample->pid,
 957							sample->tid);
 958
 959	if (thread == NULL) {
 960		pr_debug("problem processing %d event, skipping it.\n",
 961			 event->header.type);
 962		return -1;
 963	}
 964
 965	if (perf_kmem__skip_sample(sample))
 966		return 0;
 967
 968	dump_printf(" ... thread: %s:%d\n", thread__comm_str(thread), thread->tid);
 969
 970	if (evsel->handler != NULL) {
 971		tracepoint_handler f = evsel->handler;
 972		err = f(evsel, sample);
 973	}
 974
 975	thread__put(thread);
 976
 977	return err;
 978}
 979
 980static struct perf_tool perf_kmem = {
 981	.sample		 = process_sample_event,
 982	.comm		 = perf_event__process_comm,
 983	.mmap		 = perf_event__process_mmap,
 984	.mmap2		 = perf_event__process_mmap2,
 985	.namespaces	 = perf_event__process_namespaces,
 986	.ordered_events	 = true,
 987};
 988
 989static double fragmentation(unsigned long n_req, unsigned long n_alloc)
 990{
 991	if (n_alloc == 0)
 992		return 0.0;
 993	else
 994		return 100.0 - (100.0 * n_req / n_alloc);
 995}
 996
 997static void __print_slab_result(struct rb_root *root,
 998				struct perf_session *session,
 999				int n_lines, int is_caller)
1000{
1001	struct rb_node *next;
1002	struct machine *machine = &session->machines.host;
1003
1004	printf("%.105s\n", graph_dotted_line);
1005	printf(" %-34s |",  is_caller ? "Callsite": "Alloc Ptr");
1006	printf(" Total_alloc/Per | Total_req/Per   | Hit      | Ping-pong | Frag\n");
1007	printf("%.105s\n", graph_dotted_line);
1008
1009	next = rb_first(root);
1010
1011	while (next && n_lines--) {
1012		struct alloc_stat *data = rb_entry(next, struct alloc_stat,
1013						   node);
1014		struct symbol *sym = NULL;
1015		struct map *map;
1016		char buf[BUFSIZ];
1017		u64 addr;
1018
1019		if (is_caller) {
1020			addr = data->call_site;
1021			if (!raw_ip)
1022				sym = machine__find_kernel_symbol(machine, addr, &map);
1023		} else
1024			addr = data->ptr;
1025
1026		if (sym != NULL)
1027			snprintf(buf, sizeof(buf), "%s+%" PRIx64 "", sym->name,
1028				 addr - map->unmap_ip(map, sym->start));
1029		else
1030			snprintf(buf, sizeof(buf), "%#" PRIx64 "", addr);
1031		printf(" %-34s |", buf);
1032
1033		printf(" %9llu/%-5lu | %9llu/%-5lu | %8lu | %9lu | %6.3f%%\n",
1034		       (unsigned long long)data->bytes_alloc,
1035		       (unsigned long)data->bytes_alloc / data->hit,
1036		       (unsigned long long)data->bytes_req,
1037		       (unsigned long)data->bytes_req / data->hit,
1038		       (unsigned long)data->hit,
1039		       (unsigned long)data->pingpong,
1040		       fragmentation(data->bytes_req, data->bytes_alloc));
1041
1042		next = rb_next(next);
1043	}
1044
1045	if (n_lines == -1)
1046		printf(" ...                                | ...             | ...             | ...      | ...       | ...   \n");
1047
1048	printf("%.105s\n", graph_dotted_line);
1049}
1050
1051static const char * const migrate_type_str[] = {
1052	"UNMOVABL",
1053	"RECLAIM",
1054	"MOVABLE",
1055	"RESERVED",
1056	"CMA/ISLT",
1057	"UNKNOWN",
1058};
1059
1060static void __print_page_alloc_result(struct perf_session *session, int n_lines)
1061{
1062	struct rb_node *next = rb_first(&page_alloc_sorted);
1063	struct machine *machine = &session->machines.host;
1064	const char *format;
1065	int gfp_len = max(strlen("GFP flags"), max_gfp_len);
1066
1067	printf("\n%.105s\n", graph_dotted_line);
1068	printf(" %-16s | %5s alloc (KB) | Hits      | Order | Mig.type | %-*s | Callsite\n",
1069	       use_pfn ? "PFN" : "Page", live_page ? "Live" : "Total",
1070	       gfp_len, "GFP flags");
1071	printf("%.105s\n", graph_dotted_line);
1072
1073	if (use_pfn)
1074		format = " %16llu | %'16llu | %'9d | %5d | %8s | %-*s | %s\n";
1075	else
1076		format = " %016llx | %'16llu | %'9d | %5d | %8s | %-*s | %s\n";
1077
1078	while (next && n_lines--) {
1079		struct page_stat *data;
1080		struct symbol *sym;
1081		struct map *map;
1082		char buf[32];
1083		char *caller = buf;
1084
1085		data = rb_entry(next, struct page_stat, node);
1086		sym = machine__find_kernel_symbol(machine, data->callsite, &map);
1087		if (sym)
1088			caller = sym->name;
1089		else
1090			scnprintf(buf, sizeof(buf), "%"PRIx64, data->callsite);
1091
1092		printf(format, (unsigned long long)data->page,
1093		       (unsigned long long)data->alloc_bytes / 1024,
1094		       data->nr_alloc, data->order,
1095		       migrate_type_str[data->migrate_type],
1096		       gfp_len, compact_gfp_string(data->gfp_flags), caller);
1097
1098		next = rb_next(next);
1099	}
1100
1101	if (n_lines == -1) {
1102		printf(" ...              | ...              | ...       | ...   | ...      | %-*s | ...\n",
1103		       gfp_len, "...");
1104	}
1105
1106	printf("%.105s\n", graph_dotted_line);
1107}
1108
1109static void __print_page_caller_result(struct perf_session *session, int n_lines)
1110{
1111	struct rb_node *next = rb_first(&page_caller_sorted);
1112	struct machine *machine = &session->machines.host;
1113	int gfp_len = max(strlen("GFP flags"), max_gfp_len);
1114
1115	printf("\n%.105s\n", graph_dotted_line);
1116	printf(" %5s alloc (KB) | Hits      | Order | Mig.type | %-*s | Callsite\n",
1117	       live_page ? "Live" : "Total", gfp_len, "GFP flags");
1118	printf("%.105s\n", graph_dotted_line);
1119
1120	while (next && n_lines--) {
1121		struct page_stat *data;
1122		struct symbol *sym;
1123		struct map *map;
1124		char buf[32];
1125		char *caller = buf;
1126
1127		data = rb_entry(next, struct page_stat, node);
1128		sym = machine__find_kernel_symbol(machine, data->callsite, &map);
1129		if (sym)
1130			caller = sym->name;
1131		else
1132			scnprintf(buf, sizeof(buf), "%"PRIx64, data->callsite);
1133
1134		printf(" %'16llu | %'9d | %5d | %8s | %-*s | %s\n",
1135		       (unsigned long long)data->alloc_bytes / 1024,
1136		       data->nr_alloc, data->order,
1137		       migrate_type_str[data->migrate_type],
1138		       gfp_len, compact_gfp_string(data->gfp_flags), caller);
1139
1140		next = rb_next(next);
1141	}
1142
1143	if (n_lines == -1) {
1144		printf(" ...              | ...       | ...   | ...      | %-*s | ...\n",
1145		       gfp_len, "...");
1146	}
1147
1148	printf("%.105s\n", graph_dotted_line);
1149}
1150
1151static void print_gfp_flags(void)
1152{
1153	int i;
1154
1155	printf("#\n");
1156	printf("# GFP flags\n");
1157	printf("# ---------\n");
1158	for (i = 0; i < nr_gfps; i++) {
1159		printf("# %08x: %*s: %s\n", gfps[i].flags,
1160		       (int) max_gfp_len, gfps[i].compact_str,
1161		       gfps[i].human_readable);
1162	}
1163}
1164
1165static void print_slab_summary(void)
1166{
1167	printf("\nSUMMARY (SLAB allocator)");
1168	printf("\n========================\n");
1169	printf("Total bytes requested: %'lu\n", total_requested);
1170	printf("Total bytes allocated: %'lu\n", total_allocated);
1171	printf("Total bytes freed:     %'lu\n", total_freed);
1172	if (total_allocated > total_freed) {
1173		printf("Net total bytes allocated: %'lu\n",
1174		total_allocated - total_freed);
1175	}
1176	printf("Total bytes wasted on internal fragmentation: %'lu\n",
1177	       total_allocated - total_requested);
1178	printf("Internal fragmentation: %f%%\n",
1179	       fragmentation(total_requested, total_allocated));
1180	printf("Cross CPU allocations: %'lu/%'lu\n", nr_cross_allocs, nr_allocs);
1181}
1182
1183static void print_page_summary(void)
1184{
1185	int o, m;
1186	u64 nr_alloc_freed = nr_page_frees - nr_page_nomatch;
1187	u64 total_alloc_freed_bytes = total_page_free_bytes - total_page_nomatch_bytes;
1188
1189	printf("\nSUMMARY (page allocator)");
1190	printf("\n========================\n");
1191	printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total allocation requests",
1192	       nr_page_allocs, total_page_alloc_bytes / 1024);
1193	printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total free requests",
1194	       nr_page_frees, total_page_free_bytes / 1024);
1195	printf("\n");
1196
1197	printf("%-30s: %'16"PRIu64"   [ %'16"PRIu64" KB ]\n", "Total alloc+freed requests",
1198	       nr_alloc_freed, (total_alloc_freed_bytes) / 1024);
1199	printf("%-30s: %'16"PRIu64"   [ %'16"PRIu64" KB ]\n", "Total alloc-only requests",
1200	       nr_page_allocs - nr_alloc_freed,
1201	       (total_page_alloc_bytes - total_alloc_freed_bytes) / 1024);
1202	printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total free-only requests",
1203	       nr_page_nomatch, total_page_nomatch_bytes / 1024);
1204	printf("\n");
1205
1206	printf("%-30s: %'16lu   [ %'16"PRIu64" KB ]\n", "Total allocation failures",
1207	       nr_page_fails, total_page_fail_bytes / 1024);
1208	printf("\n");
1209
1210	printf("%5s  %12s  %12s  %12s  %12s  %12s\n", "Order",  "Unmovable",
1211	       "Reclaimable", "Movable", "Reserved", "CMA/Isolated");
1212	printf("%.5s  %.12s  %.12s  %.12s  %.12s  %.12s\n", graph_dotted_line,
1213	       graph_dotted_line, graph_dotted_line, graph_dotted_line,
1214	       graph_dotted_line, graph_dotted_line);
1215
1216	for (o = 0; o < MAX_PAGE_ORDER; o++) {
1217		printf("%5d", o);
1218		for (m = 0; m < MAX_MIGRATE_TYPES - 1; m++) {
1219			if (order_stats[o][m])
1220				printf("  %'12d", order_stats[o][m]);
1221			else
1222				printf("  %12c", '.');
1223		}
1224		printf("\n");
1225	}
1226}
1227
1228static void print_slab_result(struct perf_session *session)
1229{
1230	if (caller_flag)
1231		__print_slab_result(&root_caller_sorted, session, caller_lines, 1);
1232	if (alloc_flag)
1233		__print_slab_result(&root_alloc_sorted, session, alloc_lines, 0);
1234	print_slab_summary();
1235}
1236
1237static void print_page_result(struct perf_session *session)
1238{
1239	if (caller_flag || alloc_flag)
1240		print_gfp_flags();
1241	if (caller_flag)
1242		__print_page_caller_result(session, caller_lines);
1243	if (alloc_flag)
1244		__print_page_alloc_result(session, alloc_lines);
1245	print_page_summary();
1246}
1247
1248static void print_result(struct perf_session *session)
1249{
1250	if (kmem_slab)
1251		print_slab_result(session);
1252	if (kmem_page)
1253		print_page_result(session);
1254}
1255
1256static LIST_HEAD(slab_caller_sort);
1257static LIST_HEAD(slab_alloc_sort);
1258static LIST_HEAD(page_caller_sort);
1259static LIST_HEAD(page_alloc_sort);
1260
1261static void sort_slab_insert(struct rb_root *root, struct alloc_stat *data,
1262			     struct list_head *sort_list)
1263{
1264	struct rb_node **new = &(root->rb_node);
1265	struct rb_node *parent = NULL;
1266	struct sort_dimension *sort;
1267
1268	while (*new) {
1269		struct alloc_stat *this;
1270		int cmp = 0;
1271
1272		this = rb_entry(*new, struct alloc_stat, node);
1273		parent = *new;
1274
1275		list_for_each_entry(sort, sort_list, list) {
1276			cmp = sort->cmp(data, this);
1277			if (cmp)
1278				break;
1279		}
1280
1281		if (cmp > 0)
1282			new = &((*new)->rb_left);
1283		else
1284			new = &((*new)->rb_right);
1285	}
1286
1287	rb_link_node(&data->node, parent, new);
1288	rb_insert_color(&data->node, root);
1289}
1290
1291static void __sort_slab_result(struct rb_root *root, struct rb_root *root_sorted,
1292			       struct list_head *sort_list)
1293{
1294	struct rb_node *node;
1295	struct alloc_stat *data;
1296
1297	for (;;) {
1298		node = rb_first(root);
1299		if (!node)
1300			break;
1301
1302		rb_erase(node, root);
1303		data = rb_entry(node, struct alloc_stat, node);
1304		sort_slab_insert(root_sorted, data, sort_list);
1305	}
1306}
1307
1308static void sort_page_insert(struct rb_root *root, struct page_stat *data,
1309			     struct list_head *sort_list)
1310{
1311	struct rb_node **new = &root->rb_node;
1312	struct rb_node *parent = NULL;
1313	struct sort_dimension *sort;
1314
1315	while (*new) {
1316		struct page_stat *this;
1317		int cmp = 0;
1318
1319		this = rb_entry(*new, struct page_stat, node);
1320		parent = *new;
1321
1322		list_for_each_entry(sort, sort_list, list) {
1323			cmp = sort->cmp(data, this);
1324			if (cmp)
1325				break;
1326		}
1327
1328		if (cmp > 0)
1329			new = &parent->rb_left;
1330		else
1331			new = &parent->rb_right;
1332	}
1333
1334	rb_link_node(&data->node, parent, new);
1335	rb_insert_color(&data->node, root);
1336}
1337
1338static void __sort_page_result(struct rb_root *root, struct rb_root *root_sorted,
1339			       struct list_head *sort_list)
1340{
1341	struct rb_node *node;
1342	struct page_stat *data;
1343
1344	for (;;) {
1345		node = rb_first(root);
1346		if (!node)
1347			break;
1348
1349		rb_erase(node, root);
1350		data = rb_entry(node, struct page_stat, node);
1351		sort_page_insert(root_sorted, data, sort_list);
1352	}
1353}
1354
1355static void sort_result(void)
1356{
1357	if (kmem_slab) {
1358		__sort_slab_result(&root_alloc_stat, &root_alloc_sorted,
1359				   &slab_alloc_sort);
1360		__sort_slab_result(&root_caller_stat, &root_caller_sorted,
1361				   &slab_caller_sort);
1362	}
1363	if (kmem_page) {
1364		if (live_page)
1365			__sort_page_result(&page_live_tree, &page_alloc_sorted,
1366					   &page_alloc_sort);
1367		else
1368			__sort_page_result(&page_alloc_tree, &page_alloc_sorted,
1369					   &page_alloc_sort);
1370
1371		__sort_page_result(&page_caller_tree, &page_caller_sorted,
1372				   &page_caller_sort);
1373	}
1374}
1375
1376static int __cmd_kmem(struct perf_session *session)
1377{
1378	int err = -EINVAL;
1379	struct evsel *evsel;
1380	const struct evsel_str_handler kmem_tracepoints[] = {
1381		/* slab allocator */
1382		{ "kmem:kmalloc",		evsel__process_alloc_event, },
1383		{ "kmem:kmem_cache_alloc",	evsel__process_alloc_event, },
1384		{ "kmem:kmalloc_node",		evsel__process_alloc_event, },
1385		{ "kmem:kmem_cache_alloc_node", evsel__process_alloc_event, },
1386		{ "kmem:kfree",			evsel__process_free_event, },
1387		{ "kmem:kmem_cache_free",	evsel__process_free_event, },
1388		/* page allocator */
1389		{ "kmem:mm_page_alloc",		evsel__process_page_alloc_event, },
1390		{ "kmem:mm_page_free",		evsel__process_page_free_event, },
1391	};
1392
1393	if (!perf_session__has_traces(session, "kmem record"))
1394		goto out;
1395
1396	if (perf_session__set_tracepoints_handlers(session, kmem_tracepoints)) {
1397		pr_err("Initializing perf session tracepoint handlers failed\n");
1398		goto out;
1399	}
1400
1401	evlist__for_each_entry(session->evlist, evsel) {
1402		if (!strcmp(evsel__name(evsel), "kmem:mm_page_alloc") &&
1403		    evsel__field(evsel, "pfn")) {
1404			use_pfn = true;
1405			break;
1406		}
1407	}
1408
1409	setup_pager();
1410	err = perf_session__process_events(session);
1411	if (err != 0) {
1412		pr_err("error during process events: %d\n", err);
1413		goto out;
1414	}
1415	sort_result();
1416	print_result(session);
1417out:
1418	return err;
1419}
1420
1421/* slab sort keys */
1422static int ptr_cmp(void *a, void *b)
1423{
1424	struct alloc_stat *l = a;
1425	struct alloc_stat *r = b;
1426
1427	if (l->ptr < r->ptr)
1428		return -1;
1429	else if (l->ptr > r->ptr)
1430		return 1;
1431	return 0;
1432}
1433
1434static struct sort_dimension ptr_sort_dimension = {
1435	.name	= "ptr",
1436	.cmp	= ptr_cmp,
1437};
1438
1439static int slab_callsite_cmp(void *a, void *b)
1440{
1441	struct alloc_stat *l = a;
1442	struct alloc_stat *r = b;
1443
1444	if (l->call_site < r->call_site)
1445		return -1;
1446	else if (l->call_site > r->call_site)
1447		return 1;
1448	return 0;
1449}
1450
1451static struct sort_dimension callsite_sort_dimension = {
1452	.name	= "callsite",
1453	.cmp	= slab_callsite_cmp,
1454};
1455
1456static int hit_cmp(void *a, void *b)
1457{
1458	struct alloc_stat *l = a;
1459	struct alloc_stat *r = b;
1460
1461	if (l->hit < r->hit)
1462		return -1;
1463	else if (l->hit > r->hit)
1464		return 1;
1465	return 0;
1466}
1467
1468static struct sort_dimension hit_sort_dimension = {
1469	.name	= "hit",
1470	.cmp	= hit_cmp,
1471};
1472
1473static int bytes_cmp(void *a, void *b)
1474{
1475	struct alloc_stat *l = a;
1476	struct alloc_stat *r = b;
1477
1478	if (l->bytes_alloc < r->bytes_alloc)
1479		return -1;
1480	else if (l->bytes_alloc > r->bytes_alloc)
1481		return 1;
1482	return 0;
1483}
1484
1485static struct sort_dimension bytes_sort_dimension = {
1486	.name	= "bytes",
1487	.cmp	= bytes_cmp,
1488};
1489
1490static int frag_cmp(void *a, void *b)
1491{
1492	double x, y;
1493	struct alloc_stat *l = a;
1494	struct alloc_stat *r = b;
1495
1496	x = fragmentation(l->bytes_req, l->bytes_alloc);
1497	y = fragmentation(r->bytes_req, r->bytes_alloc);
1498
1499	if (x < y)
1500		return -1;
1501	else if (x > y)
1502		return 1;
1503	return 0;
1504}
1505
1506static struct sort_dimension frag_sort_dimension = {
1507	.name	= "frag",
1508	.cmp	= frag_cmp,
1509};
1510
1511static int pingpong_cmp(void *a, void *b)
1512{
1513	struct alloc_stat *l = a;
1514	struct alloc_stat *r = b;
1515
1516	if (l->pingpong < r->pingpong)
1517		return -1;
1518	else if (l->pingpong > r->pingpong)
1519		return 1;
1520	return 0;
1521}
1522
1523static struct sort_dimension pingpong_sort_dimension = {
1524	.name	= "pingpong",
1525	.cmp	= pingpong_cmp,
1526};
1527
1528/* page sort keys */
1529static int page_cmp(void *a, void *b)
1530{
1531	struct page_stat *l = a;
1532	struct page_stat *r = b;
1533
1534	if (l->page < r->page)
1535		return -1;
1536	else if (l->page > r->page)
1537		return 1;
1538	return 0;
1539}
1540
1541static struct sort_dimension page_sort_dimension = {
1542	.name	= "page",
1543	.cmp	= page_cmp,
1544};
1545
1546static int page_callsite_cmp(void *a, void *b)
1547{
1548	struct page_stat *l = a;
1549	struct page_stat *r = b;
1550
1551	if (l->callsite < r->callsite)
1552		return -1;
1553	else if (l->callsite > r->callsite)
1554		return 1;
1555	return 0;
1556}
1557
1558static struct sort_dimension page_callsite_sort_dimension = {
1559	.name	= "callsite",
1560	.cmp	= page_callsite_cmp,
1561};
1562
1563static int page_hit_cmp(void *a, void *b)
1564{
1565	struct page_stat *l = a;
1566	struct page_stat *r = b;
1567
1568	if (l->nr_alloc < r->nr_alloc)
1569		return -1;
1570	else if (l->nr_alloc > r->nr_alloc)
1571		return 1;
1572	return 0;
1573}
1574
1575static struct sort_dimension page_hit_sort_dimension = {
1576	.name	= "hit",
1577	.cmp	= page_hit_cmp,
1578};
1579
1580static int page_bytes_cmp(void *a, void *b)
1581{
1582	struct page_stat *l = a;
1583	struct page_stat *r = b;
1584
1585	if (l->alloc_bytes < r->alloc_bytes)
1586		return -1;
1587	else if (l->alloc_bytes > r->alloc_bytes)
1588		return 1;
1589	return 0;
1590}
1591
1592static struct sort_dimension page_bytes_sort_dimension = {
1593	.name	= "bytes",
1594	.cmp	= page_bytes_cmp,
1595};
1596
1597static int page_order_cmp(void *a, void *b)
1598{
1599	struct page_stat *l = a;
1600	struct page_stat *r = b;
1601
1602	if (l->order < r->order)
1603		return -1;
1604	else if (l->order > r->order)
1605		return 1;
1606	return 0;
1607}
1608
1609static struct sort_dimension page_order_sort_dimension = {
1610	.name	= "order",
1611	.cmp	= page_order_cmp,
1612};
1613
1614static int migrate_type_cmp(void *a, void *b)
1615{
1616	struct page_stat *l = a;
1617	struct page_stat *r = b;
1618
1619	/* for internal use to find free'd page */
1620	if (l->migrate_type == -1U)
1621		return 0;
1622
1623	if (l->migrate_type < r->migrate_type)
1624		return -1;
1625	else if (l->migrate_type > r->migrate_type)
1626		return 1;
1627	return 0;
1628}
1629
1630static struct sort_dimension migrate_type_sort_dimension = {
1631	.name	= "migtype",
1632	.cmp	= migrate_type_cmp,
1633};
1634
1635static int gfp_flags_cmp(void *a, void *b)
1636{
1637	struct page_stat *l = a;
1638	struct page_stat *r = b;
1639
1640	/* for internal use to find free'd page */
1641	if (l->gfp_flags == -1U)
1642		return 0;
1643
1644	if (l->gfp_flags < r->gfp_flags)
1645		return -1;
1646	else if (l->gfp_flags > r->gfp_flags)
1647		return 1;
1648	return 0;
1649}
1650
1651static struct sort_dimension gfp_flags_sort_dimension = {
1652	.name	= "gfp",
1653	.cmp	= gfp_flags_cmp,
1654};
1655
1656static struct sort_dimension *slab_sorts[] = {
1657	&ptr_sort_dimension,
1658	&callsite_sort_dimension,
1659	&hit_sort_dimension,
1660	&bytes_sort_dimension,
1661	&frag_sort_dimension,
1662	&pingpong_sort_dimension,
1663};
1664
1665static struct sort_dimension *page_sorts[] = {
1666	&page_sort_dimension,
1667	&page_callsite_sort_dimension,
1668	&page_hit_sort_dimension,
1669	&page_bytes_sort_dimension,
1670	&page_order_sort_dimension,
1671	&migrate_type_sort_dimension,
1672	&gfp_flags_sort_dimension,
1673};
1674
1675static int slab_sort_dimension__add(const char *tok, struct list_head *list)
1676{
1677	struct sort_dimension *sort;
1678	int i;
1679
1680	for (i = 0; i < (int)ARRAY_SIZE(slab_sorts); i++) {
1681		if (!strcmp(slab_sorts[i]->name, tok)) {
1682			sort = memdup(slab_sorts[i], sizeof(*slab_sorts[i]));
1683			if (!sort) {
1684				pr_err("%s: memdup failed\n", __func__);
1685				return -1;
1686			}
1687			list_add_tail(&sort->list, list);
1688			return 0;
1689		}
1690	}
1691
1692	return -1;
1693}
1694
1695static int page_sort_dimension__add(const char *tok, struct list_head *list)
1696{
1697	struct sort_dimension *sort;
1698	int i;
1699
1700	for (i = 0; i < (int)ARRAY_SIZE(page_sorts); i++) {
1701		if (!strcmp(page_sorts[i]->name, tok)) {
1702			sort = memdup(page_sorts[i], sizeof(*page_sorts[i]));
1703			if (!sort) {
1704				pr_err("%s: memdup failed\n", __func__);
1705				return -1;
1706			}
1707			list_add_tail(&sort->list, list);
1708			return 0;
1709		}
1710	}
1711
1712	return -1;
1713}
1714
1715static int setup_slab_sorting(struct list_head *sort_list, const char *arg)
1716{
1717	char *tok;
1718	char *str = strdup(arg);
1719	char *pos = str;
1720
1721	if (!str) {
1722		pr_err("%s: strdup failed\n", __func__);
1723		return -1;
1724	}
1725
1726	while (true) {
1727		tok = strsep(&pos, ",");
1728		if (!tok)
1729			break;
1730		if (slab_sort_dimension__add(tok, sort_list) < 0) {
1731			pr_err("Unknown slab --sort key: '%s'", tok);
1732			free(str);
1733			return -1;
1734		}
1735	}
1736
1737	free(str);
1738	return 0;
1739}
1740
1741static int setup_page_sorting(struct list_head *sort_list, const char *arg)
1742{
1743	char *tok;
1744	char *str = strdup(arg);
1745	char *pos = str;
1746
1747	if (!str) {
1748		pr_err("%s: strdup failed\n", __func__);
1749		return -1;
1750	}
1751
1752	while (true) {
1753		tok = strsep(&pos, ",");
1754		if (!tok)
1755			break;
1756		if (page_sort_dimension__add(tok, sort_list) < 0) {
1757			pr_err("Unknown page --sort key: '%s'", tok);
1758			free(str);
1759			return -1;
1760		}
1761	}
1762
1763	free(str);
1764	return 0;
1765}
1766
1767static int parse_sort_opt(const struct option *opt __maybe_unused,
1768			  const char *arg, int unset __maybe_unused)
1769{
1770	if (!arg)
1771		return -1;
1772
1773	if (kmem_page > kmem_slab ||
1774	    (kmem_page == 0 && kmem_slab == 0 && kmem_default == KMEM_PAGE)) {
1775		if (caller_flag > alloc_flag)
1776			return setup_page_sorting(&page_caller_sort, arg);
1777		else
1778			return setup_page_sorting(&page_alloc_sort, arg);
1779	} else {
1780		if (caller_flag > alloc_flag)
1781			return setup_slab_sorting(&slab_caller_sort, arg);
1782		else
1783			return setup_slab_sorting(&slab_alloc_sort, arg);
1784	}
1785
1786	return 0;
1787}
1788
1789static int parse_caller_opt(const struct option *opt __maybe_unused,
1790			    const char *arg __maybe_unused,
1791			    int unset __maybe_unused)
1792{
1793	caller_flag = (alloc_flag + 1);
1794	return 0;
1795}
1796
1797static int parse_alloc_opt(const struct option *opt __maybe_unused,
1798			   const char *arg __maybe_unused,
1799			   int unset __maybe_unused)
1800{
1801	alloc_flag = (caller_flag + 1);
1802	return 0;
1803}
1804
1805static int parse_slab_opt(const struct option *opt __maybe_unused,
1806			  const char *arg __maybe_unused,
1807			  int unset __maybe_unused)
1808{
1809	kmem_slab = (kmem_page + 1);
1810	return 0;
1811}
1812
1813static int parse_page_opt(const struct option *opt __maybe_unused,
1814			  const char *arg __maybe_unused,
1815			  int unset __maybe_unused)
1816{
1817	kmem_page = (kmem_slab + 1);
1818	return 0;
1819}
1820
1821static int parse_line_opt(const struct option *opt __maybe_unused,
1822			  const char *arg, int unset __maybe_unused)
1823{
1824	int lines;
1825
1826	if (!arg)
1827		return -1;
1828
1829	lines = strtoul(arg, NULL, 10);
1830
1831	if (caller_flag > alloc_flag)
1832		caller_lines = lines;
1833	else
1834		alloc_lines = lines;
1835
1836	return 0;
1837}
1838
1839static bool slab_legacy_tp_is_exposed(void)
1840{
1841	/*
1842	 * The tracepoints "kmem:kmalloc_node" and
1843	 * "kmem:kmem_cache_alloc_node" have been removed on the latest
1844	 * kernel, if the tracepoint "kmem:kmalloc_node" is existed it
1845	 * means the tool is running on an old kernel, we need to
1846	 * rollback to support these legacy tracepoints.
1847	 */
1848	return IS_ERR(trace_event__tp_format("kmem", "kmalloc_node")) ?
1849		false : true;
1850}
1851
1852static int __cmd_record(int argc, const char **argv)
1853{
1854	const char * const record_args[] = {
1855	"record", "-a", "-R", "-c", "1",
1856	};
1857	const char * const slab_events[] = {
1858	"-e", "kmem:kmalloc",
1859	"-e", "kmem:kfree",
1860	"-e", "kmem:kmem_cache_alloc",
1861	"-e", "kmem:kmem_cache_free",
1862	};
1863	const char * const slab_legacy_events[] = {
1864	"-e", "kmem:kmalloc_node",
1865	"-e", "kmem:kmem_cache_alloc_node",
1866	};
1867	const char * const page_events[] = {
1868	"-e", "kmem:mm_page_alloc",
1869	"-e", "kmem:mm_page_free",
1870	};
1871	unsigned int rec_argc, i, j;
1872	const char **rec_argv;
1873	unsigned int slab_legacy_tp_exposed = slab_legacy_tp_is_exposed();
1874
1875	rec_argc = ARRAY_SIZE(record_args) + argc - 1;
1876	if (kmem_slab) {
1877		rec_argc += ARRAY_SIZE(slab_events);
1878		if (slab_legacy_tp_exposed)
1879			rec_argc += ARRAY_SIZE(slab_legacy_events);
1880	}
1881	if (kmem_page)
1882		rec_argc += ARRAY_SIZE(page_events) + 1; /* for -g */
1883
1884	rec_argv = calloc(rec_argc + 1, sizeof(char *));
1885
1886	if (rec_argv == NULL)
1887		return -ENOMEM;
1888
1889	for (i = 0; i < ARRAY_SIZE(record_args); i++)
1890		rec_argv[i] = strdup(record_args[i]);
1891
1892	if (kmem_slab) {
1893		for (j = 0; j < ARRAY_SIZE(slab_events); j++, i++)
1894			rec_argv[i] = strdup(slab_events[j]);
1895		if (slab_legacy_tp_exposed) {
1896			for (j = 0; j < ARRAY_SIZE(slab_legacy_events); j++, i++)
1897				rec_argv[i] = strdup(slab_legacy_events[j]);
1898		}
1899	}
1900	if (kmem_page) {
1901		rec_argv[i++] = strdup("-g");
1902
1903		for (j = 0; j < ARRAY_SIZE(page_events); j++, i++)
1904			rec_argv[i] = strdup(page_events[j]);
1905	}
1906
1907	for (j = 1; j < (unsigned int)argc; j++, i++)
1908		rec_argv[i] = argv[j];
1909
1910	return cmd_record(i, rec_argv);
1911}
1912
1913static int kmem_config(const char *var, const char *value, void *cb __maybe_unused)
1914{
1915	if (!strcmp(var, "kmem.default")) {
1916		if (!strcmp(value, "slab"))
1917			kmem_default = KMEM_SLAB;
1918		else if (!strcmp(value, "page"))
1919			kmem_default = KMEM_PAGE;
1920		else
1921			pr_err("invalid default value ('slab' or 'page' required): %s\n",
1922			       value);
1923		return 0;
1924	}
1925
1926	return 0;
1927}
1928
1929int cmd_kmem(int argc, const char **argv)
1930{
1931	const char * const default_slab_sort = "frag,hit,bytes";
1932	const char * const default_page_sort = "bytes,hit";
1933	struct perf_data data = {
1934		.mode = PERF_DATA_MODE_READ,
1935	};
1936	const struct option kmem_options[] = {
1937	OPT_STRING('i', "input", &input_name, "file", "input file name"),
1938	OPT_INCR('v', "verbose", &verbose,
1939		    "be more verbose (show symbol address, etc)"),
1940	OPT_CALLBACK_NOOPT(0, "caller", NULL, NULL,
1941			   "show per-callsite statistics", parse_caller_opt),
1942	OPT_CALLBACK_NOOPT(0, "alloc", NULL, NULL,
1943			   "show per-allocation statistics", parse_alloc_opt),
1944	OPT_CALLBACK('s', "sort", NULL, "key[,key2...]",
1945		     "sort by keys: ptr, callsite, bytes, hit, pingpong, frag, "
1946		     "page, order, migtype, gfp", parse_sort_opt),
1947	OPT_CALLBACK('l', "line", NULL, "num", "show n lines", parse_line_opt),
1948	OPT_BOOLEAN(0, "raw-ip", &raw_ip, "show raw ip instead of symbol"),
1949	OPT_BOOLEAN('f', "force", &data.force, "don't complain, do it"),
1950	OPT_CALLBACK_NOOPT(0, "slab", NULL, NULL, "Analyze slab allocator",
1951			   parse_slab_opt),
1952	OPT_CALLBACK_NOOPT(0, "page", NULL, NULL, "Analyze page allocator",
1953			   parse_page_opt),
1954	OPT_BOOLEAN(0, "live", &live_page, "Show live page stat"),
1955	OPT_STRING(0, "time", &time_str, "str",
1956		   "Time span of interest (start,stop)"),
1957	OPT_END()
1958	};
1959	const char *const kmem_subcommands[] = { "record", "stat", NULL };
1960	const char *kmem_usage[] = {
1961		NULL,
1962		NULL
1963	};
1964	struct perf_session *session;
1965	static const char errmsg[] = "No %s allocation events found.  Have you run 'perf kmem record --%s'?\n";
1966	int ret = perf_config(kmem_config, NULL);
1967
1968	if (ret)
1969		return ret;
1970
1971	argc = parse_options_subcommand(argc, argv, kmem_options,
1972					kmem_subcommands, kmem_usage,
1973					PARSE_OPT_STOP_AT_NON_OPTION);
1974
1975	if (!argc)
1976		usage_with_options(kmem_usage, kmem_options);
1977
1978	if (kmem_slab == 0 && kmem_page == 0) {
1979		if (kmem_default == KMEM_SLAB)
1980			kmem_slab = 1;
1981		else
1982			kmem_page = 1;
1983	}
1984
1985	if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
1986		symbol__init(NULL);
1987		return __cmd_record(argc, argv);
1988	}
1989
1990	data.path = input_name;
1991
1992	kmem_session = session = perf_session__new(&data, &perf_kmem);
1993	if (IS_ERR(session))
1994		return PTR_ERR(session);
1995
1996	ret = -1;
1997
1998	if (kmem_slab) {
1999		if (!evlist__find_tracepoint_by_name(session->evlist, "kmem:kmalloc")) {
2000			pr_err(errmsg, "slab", "slab");
2001			goto out_delete;
2002		}
2003	}
2004
2005	if (kmem_page) {
2006		struct evsel *evsel = evlist__find_tracepoint_by_name(session->evlist, "kmem:mm_page_alloc");
2007
2008		if (evsel == NULL) {
2009			pr_err(errmsg, "page", "page");
2010			goto out_delete;
2011		}
2012
2013		kmem_page_size = tep_get_page_size(evsel->tp_format->tep);
2014		symbol_conf.use_callchain = true;
2015	}
2016
2017	symbol__init(&session->header.env);
2018
2019	if (perf_time__parse_str(&ptime, time_str) != 0) {
2020		pr_err("Invalid time string\n");
2021		ret = -EINVAL;
2022		goto out_delete;
2023	}
2024
2025	if (!strcmp(argv[0], "stat")) {
2026		setlocale(LC_ALL, "");
2027
2028		if (cpu__setup_cpunode_map())
2029			goto out_delete;
2030
2031		if (list_empty(&slab_caller_sort))
2032			setup_slab_sorting(&slab_caller_sort, default_slab_sort);
2033		if (list_empty(&slab_alloc_sort))
2034			setup_slab_sorting(&slab_alloc_sort, default_slab_sort);
2035		if (list_empty(&page_caller_sort))
2036			setup_page_sorting(&page_caller_sort, default_page_sort);
2037		if (list_empty(&page_alloc_sort))
2038			setup_page_sorting(&page_alloc_sort, default_page_sort);
2039
2040		if (kmem_page) {
2041			setup_page_sorting(&page_alloc_sort_input,
2042					   "page,order,migtype,gfp");
2043			setup_page_sorting(&page_caller_sort_input,
2044					   "callsite,order,migtype,gfp");
2045		}
2046		ret = __cmd_kmem(session);
2047	} else
2048		usage_with_options(kmem_usage, kmem_options);
2049
2050out_delete:
2051	perf_session__delete(session);
2052
2053	return ret;
2054}
2055