tools/vm/page-types.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * page-types: Tool for querying page flags
   4  *
   5  * Copyright (C) 2009 Intel corporation
   6  *
   7  * Authors: Wu Fengguang <fengguang.wu@intel.com>
   8  */
   9
  10 #define _FILE_OFFSET_BITS 64
  11 #define _GNU_SOURCE
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <unistd.h>
  15 #include <stdint.h>
  16 #include <stdarg.h>
  17 #include <string.h>
  18 #include <getopt.h>
  19 #include <limits.h>
  20 #include <assert.h>
  21 #include <ftw.h>
  22 #include <time.h>
  23 #include <setjmp.h>
  24 #include <signal.h>
  25 #include <sys/types.h>
  26 #include <sys/errno.h>
  27 #include <sys/fcntl.h>
  28 #include <sys/mount.h>
  29 #include <sys/statfs.h>
  30 #include <sys/mman.h>
  31 #include "../../include/uapi/linux/magic.h"
  32 #include "../../include/uapi/linux/kernel-page-flags.h"
  33 #include <api/fs/fs.h>
  34
  35 #ifndef MAX_PATH
  36 # define MAX_PATH 256
  37 #endif
  38
  39 #ifndef STR
  40 # define _STR(x) #x
  41 # define STR(x) _STR(x)
  42 #endif
  43
  44 /*
  45  * pagemap kernel ABI bits
  46  */
  47
  48 #define PM_ENTRY_BYTES          8
  49 #define PM_PFRAME_BITS          55
  50 #define PM_PFRAME_MASK          ((1LL << PM_PFRAME_BITS) - 1)
  51 #define PM_PFRAME(x)            ((x) & PM_PFRAME_MASK)
  52 #define MAX_SWAPFILES_SHIFT     5
  53 #define PM_SWAP_OFFSET(x)       (((x) & PM_PFRAME_MASK) >> MAX_SWAPFILES_SHIFT)
  54 #define PM_SOFT_DIRTY           (1ULL << 55)
  55 #define PM_MMAP_EXCLUSIVE       (1ULL << 56)
  56 #define PM_FILE                 (1ULL << 61)
  57 #define PM_SWAP                 (1ULL << 62)
  58 #define PM_PRESENT              (1ULL << 63)
  59
  60 /*
  61  * kernel page flags
  62  */
  63
  64 #define KPF_BYTES               8
  65 #define PROC_KPAGEFLAGS         "/proc/kpageflags"
  66 #define PROC_KPAGECOUNT         "/proc/kpagecount"
  67 #define PROC_KPAGECGROUP        "/proc/kpagecgroup"
  68
  69 #define SYS_KERNEL_MM_PAGE_IDLE "/sys/kernel/mm/page_idle/bitmap"
  70
  71 /* [32-] kernel hacking assistances */
  72 #define KPF_RESERVED            32
  73 #define KPF_MLOCKED             33
  74 #define KPF_MAPPEDTODISK        34
  75 #define KPF_PRIVATE             35
  76 #define KPF_PRIVATE_2           36
  77 #define KPF_OWNER_PRIVATE       37
  78 #define KPF_ARCH                38
  79 #define KPF_UNCACHED            39
  80 #define KPF_SOFTDIRTY           40
  81 #define KPF_ARCH_2              41
  82
  83 /* [47-] take some arbitrary free slots for expanding overloaded flags
  84  * not part of kernel API
  85  */
  86 #define KPF_ANON_EXCLUSIVE      47
  87 #define KPF_READAHEAD           48
  88 #define KPF_SLOB_FREE           49
  89 #define KPF_SLUB_FROZEN         50
  90 #define KPF_SLUB_DEBUG          51
  91 #define KPF_FILE                61
  92 #define KPF_SWAP                62
  93 #define KPF_MMAP_EXCLUSIVE      63
  94
  95 #define KPF_ALL_BITS            ((uint64_t)~0ULL)
  96 #define KPF_HACKERS_BITS        (0xffffULL << 32)
  97 #define KPF_OVERLOADED_BITS     (0xffffULL << 48)
  98 #define BIT(name)               (1ULL << KPF_##name)
  99 #define BITS_COMPOUND           (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
 100
 101 static const char * const page_flag_names[] = {
 102         [KPF_LOCKED]            = "L:locked",
 103         [KPF_ERROR]             = "E:error",
 104         [KPF_REFERENCED]        = "R:referenced",
 105         [KPF_UPTODATE]          = "U:uptodate",
 106         [KPF_DIRTY]             = "D:dirty",
 107         [KPF_LRU]               = "l:lru",
 108         [KPF_ACTIVE]            = "A:active",
 109         [KPF_SLAB]              = "S:slab",
 110         [KPF_WRITEBACK]         = "W:writeback",
 111         [KPF_RECLAIM]           = "I:reclaim",
 112         [KPF_BUDDY]             = "B:buddy",
 113
 114         [KPF_MMAP]              = "M:mmap",
 115         [KPF_ANON]              = "a:anonymous",
 116         [KPF_SWAPCACHE]         = "s:swapcache",
 117         [KPF_SWAPBACKED]        = "b:swapbacked",
 118         [KPF_COMPOUND_HEAD]     = "H:compound_head",
 119         [KPF_COMPOUND_TAIL]     = "T:compound_tail",
 120         [KPF_HUGE]              = "G:huge",
 121         [KPF_UNEVICTABLE]       = "u:unevictable",
 122         [KPF_HWPOISON]          = "X:hwpoison",
 123         [KPF_NOPAGE]            = "n:nopage",
 124         [KPF_KSM]               = "x:ksm",
 125         [KPF_THP]               = "t:thp",
 126         [KPF_OFFLINE]           = "o:offline",
 127         [KPF_PGTABLE]           = "g:pgtable",
 128         [KPF_ZERO_PAGE]         = "z:zero_page",
 129         [KPF_IDLE]              = "i:idle_page",
 130
 131         [KPF_RESERVED]          = "r:reserved",
 132         [KPF_MLOCKED]           = "m:mlocked",
 133         [KPF_MAPPEDTODISK]      = "d:mappedtodisk",
 134         [KPF_PRIVATE]           = "P:private",
 135         [KPF_PRIVATE_2]         = "p:private_2",
 136         [KPF_OWNER_PRIVATE]     = "O:owner_private",
 137         [KPF_ARCH]              = "h:arch",
 138         [KPF_UNCACHED]          = "c:uncached",
 139         [KPF_SOFTDIRTY]         = "f:softdirty",
 140         [KPF_ARCH_2]            = "H:arch_2",
 141
 142         [KPF_ANON_EXCLUSIVE]    = "d:anon_exclusive",
 143         [KPF_READAHEAD]         = "I:readahead",
 144         [KPF_SLOB_FREE]         = "P:slob_free",
 145         [KPF_SLUB_FROZEN]       = "A:slub_frozen",
 146         [KPF_SLUB_DEBUG]        = "E:slub_debug",
 147
 148         [KPF_FILE]              = "F:file",
 149         [KPF_SWAP]              = "w:swap",
 150         [KPF_MMAP_EXCLUSIVE]    = "1:mmap_exclusive",
 151 };
 152
 153
 154 /*
 155  * data structures
 156  */
 157
 158 static int              opt_raw;        /* for kernel developers */
 159 static int              opt_list;       /* list pages (in ranges) */
 160 static int              opt_mark_idle;  /* set accessed bit */
 161 static int              opt_no_summary; /* don't show summary */
 162 static pid_t            opt_pid;        /* process to walk */
 163 const char              *opt_file;      /* file or directory path */
 164 static uint64_t         opt_cgroup;     /* cgroup inode */
 165 static int              opt_list_cgroup;/* list page cgroup */
 166 static int              opt_list_mapcnt;/* list page map count */
 167 static const char       *opt_kpageflags;/* kpageflags file to parse */
 168
 169 #define MAX_ADDR_RANGES 1024
 170 static int              nr_addr_ranges;
 171 static unsigned long    opt_offset[MAX_ADDR_RANGES];
 172 static unsigned long    opt_size[MAX_ADDR_RANGES];
 173
 174 #define MAX_VMAS        10240
 175 static int              nr_vmas;
 176 static unsigned long    pg_start[MAX_VMAS];
 177 static unsigned long    pg_end[MAX_VMAS];
 178
 179 #define MAX_BIT_FILTERS 64
 180 static int              nr_bit_filters;
 181 static uint64_t         opt_mask[MAX_BIT_FILTERS];
 182 static uint64_t         opt_bits[MAX_BIT_FILTERS];
 183
 184 static int              page_size;
 185
 186 static int              pagemap_fd;
 187 static int              kpageflags_fd;
 188 static int              kpagecount_fd = -1;
 189 static int              kpagecgroup_fd = -1;
 190 static int              page_idle_fd = -1;
 191
 192 static int              opt_hwpoison;
 193 static int              opt_unpoison;
 194
 195 static const char       *hwpoison_debug_fs;
 196 static int              hwpoison_inject_fd;
 197 static int              hwpoison_forget_fd;
 198
 199 #define HASH_SHIFT      13
 200 #define HASH_SIZE       (1 << HASH_SHIFT)
 201 #define HASH_MASK       (HASH_SIZE - 1)
 202 #define HASH_KEY(flags) (flags & HASH_MASK)
 203
 204 static unsigned long    total_pages;
 205 static unsigned long    nr_pages[HASH_SIZE];
 206 static uint64_t         page_flags[HASH_SIZE];
 207
 208
 209 /*
 210  * helper functions
 211  */
 212
 213 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
 214
 215 #define min_t(type, x, y) ({                    \
 216         type __min1 = (x);                      \
 217         type __min2 = (y);                      \
 218         __min1 < __min2 ? __min1 : __min2; })
 219
 220 #define max_t(type, x, y) ({                    \
 221         type __max1 = (x);                      \
 222         type __max2 = (y);                      \
 223         __max1 > __max2 ? __max1 : __max2; })
 224
 225 static unsigned long pages2mb(unsigned long pages)
 226 {
 227         return (pages * page_size) >> 20;
 228 }
 229
 230 static void fatal(const char *x, ...)
 231 {
 232         va_list ap;
 233
 234         va_start(ap, x);
 235         vfprintf(stderr, x, ap);
 236         va_end(ap);
 237         exit(EXIT_FAILURE);
 238 }
 239
 240 static int checked_open(const char *pathname, int flags)
 241 {
 242         int fd = open(pathname, flags);
 243
 244         if (fd < 0) {
 245                 perror(pathname);
 246                 exit(EXIT_FAILURE);
 247         }
 248
 249         return fd;
 250 }
 251
 252 /*
 253  * pagemap/kpageflags routines
 254  */
 255
 256 static unsigned long do_u64_read(int fd, const char *name,
 257                                  uint64_t *buf,
 258                                  unsigned long index,
 259                                  unsigned long count)
 260 {
 261         long bytes;
 262
 263         if (index > ULONG_MAX / 8)
 264                 fatal("index overflow: %lu\n", index);
 265
 266         bytes = pread(fd, buf, count * 8, (off_t)index * 8);
 267         if (bytes < 0) {
 268                 perror(name);
 269                 exit(EXIT_FAILURE);
 270         }
 271         if (bytes % 8)
 272                 fatal("partial read: %lu bytes\n", bytes);
 273
 274         return bytes / 8;
 275 }
 276
 277 static unsigned long kpageflags_read(uint64_t *buf,
 278                                      unsigned long index,
 279                                      unsigned long pages)
 280 {
 281         return do_u64_read(kpageflags_fd, opt_kpageflags, buf, index, pages);
 282 }
 283
 284 static unsigned long kpagecgroup_read(uint64_t *buf,
 285                                       unsigned long index,
 286                                       unsigned long pages)
 287 {
 288         if (kpagecgroup_fd < 0)
 289                 return pages;
 290
 291         return do_u64_read(kpagecgroup_fd, opt_kpageflags, buf, index, pages);
 292 }
 293
 294 static unsigned long kpagecount_read(uint64_t *buf,
 295                                      unsigned long index,
 296                                      unsigned long pages)
 297 {
 298         return kpagecount_fd < 0 ? pages :
 299                 do_u64_read(kpagecount_fd, PROC_KPAGECOUNT,
 300                             buf, index, pages);
 301 }
 302
 303 static unsigned long pagemap_read(uint64_t *buf,
 304                                   unsigned long index,
 305                                   unsigned long pages)
 306 {
 307         return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
 308 }
 309
 310 static unsigned long pagemap_pfn(uint64_t val)
 311 {
 312         unsigned long pfn;
 313
 314         if (val & PM_PRESENT)
 315                 pfn = PM_PFRAME(val);
 316         else
 317                 pfn = 0;
 318
 319         return pfn;
 320 }
 321
 322 static unsigned long pagemap_swap_offset(uint64_t val)
 323 {
 324         return val & PM_SWAP ? PM_SWAP_OFFSET(val) : 0;
 325 }
 326
 327 /*
 328  * page flag names
 329  */
 330
 331 static char *page_flag_name(uint64_t flags)
 332 {
 333         static char buf[65];
 334         int present;
 335         size_t i, j;
 336
 337         for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
 338                 present = (flags >> i) & 1;
 339                 if (!page_flag_names[i]) {
 340                         if (present)
 341                                 fatal("unknown flag bit %d\n", i);
 342                         continue;
 343                 }
 344                 buf[j++] = present ? page_flag_names[i][0] : '_';
 345         }
 346
 347         return buf;
 348 }
 349
 350 static char *page_flag_longname(uint64_t flags)
 351 {
 352         static char buf[1024];
 353         size_t i, n;
 354
 355         for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
 356                 if (!page_flag_names[i])
 357                         continue;
 358                 if ((flags >> i) & 1)
 359                         n += snprintf(buf + n, sizeof(buf) - n, "%s,",
 360                                         page_flag_names[i] + 2);
 361         }
 362         if (n)
 363                 n--;
 364         buf[n] = '\0';
 365
 366         return buf;
 367 }
 368
 369
 370 /*
 371  * page list and summary
 372  */
 373
 374 static void show_page_range(unsigned long voffset, unsigned long offset,
 375                             unsigned long size, uint64_t flags,
 376                             uint64_t cgroup, uint64_t mapcnt)
 377 {
 378         static uint64_t      flags0;
 379         static uint64_t      cgroup0;
 380         static uint64_t      mapcnt0;
 381         static unsigned long voff;
 382         static unsigned long index;
 383         static unsigned long count;
 384
 385         if (flags == flags0 && cgroup == cgroup0 && mapcnt == mapcnt0 &&
 386             offset == index + count && size && voffset == voff + count) {
 387                 count += size;
 388                 return;
 389         }
 390
 391         if (count) {
 392                 if (opt_pid)
 393                         printf("%lx\t", voff);
 394                 if (opt_file)
 395                         printf("%lx\t", voff);
 396                 if (opt_list_cgroup)
 397                         printf("@%llu\t", (unsigned long long)cgroup0);
 398                 if (opt_list_mapcnt)
 399                         printf("%lu\t", mapcnt0);
 400                 printf("%lx\t%lx\t%s\n",
 401                                 index, count, page_flag_name(flags0));
 402         }
 403
 404         flags0 = flags;
 405         cgroup0 = cgroup;
 406         mapcnt0 = mapcnt;
 407         index  = offset;
 408         voff   = voffset;
 409         count  = size;
 410 }
 411
 412 static void flush_page_range(void)
 413 {
 414         show_page_range(0, 0, 0, 0, 0, 0);
 415 }
 416
 417 static void show_page(unsigned long voffset, unsigned long offset,
 418                       uint64_t flags, uint64_t cgroup, uint64_t mapcnt)
 419 {
 420         if (opt_pid)
 421                 printf("%lx\t", voffset);
 422         if (opt_file)
 423                 printf("%lx\t", voffset);
 424         if (opt_list_cgroup)
 425                 printf("@%llu\t", (unsigned long long)cgroup);
 426         if (opt_list_mapcnt)
 427                 printf("%lu\t", mapcnt);
 428
 429         printf("%lx\t%s\n", offset, page_flag_name(flags));
 430 }
 431
 432 static void show_summary(void)
 433 {
 434         size_t i;
 435
 436         printf("             flags\tpage-count       MB"
 437                 "  symbolic-flags\t\t\tlong-symbolic-flags\n");
 438
 439         for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
 440                 if (nr_pages[i])
 441                         printf("0x%016llx\t%10lu %8lu  %s\t%s\n",
 442                                 (unsigned long long)page_flags[i],
 443                                 nr_pages[i],
 444                                 pages2mb(nr_pages[i]),
 445                                 page_flag_name(page_flags[i]),
 446                                 page_flag_longname(page_flags[i]));
 447         }
 448
 449         printf("             total\t%10lu %8lu\n",
 450                         total_pages, pages2mb(total_pages));
 451 }
 452
 453
 454 /*
 455  * page flag filters
 456  */
 457
 458 static int bit_mask_ok(uint64_t flags)
 459 {
 460         int i;
 461
 462         for (i = 0; i < nr_bit_filters; i++) {
 463                 if (opt_bits[i] == KPF_ALL_BITS) {
 464                         if ((flags & opt_mask[i]) == 0)
 465                                 return 0;
 466                 } else {
 467                         if ((flags & opt_mask[i]) != opt_bits[i])
 468                                 return 0;
 469                 }
 470         }
 471
 472         return 1;
 473 }
 474
 475 static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
 476 {
 477         /* Anonymous pages overload PG_mappedtodisk */
 478         if ((flags & BIT(ANON)) && (flags & BIT(MAPPEDTODISK)))
 479                 flags ^= BIT(MAPPEDTODISK) | BIT(ANON_EXCLUSIVE);
 480
 481         /* SLOB/SLUB overload several page flags */
 482         if (flags & BIT(SLAB)) {
 483                 if (flags & BIT(PRIVATE))
 484                         flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
 485                 if (flags & BIT(ACTIVE))
 486                         flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
 487                 if (flags & BIT(ERROR))
 488                         flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
 489         }
 490
 491         /* PG_reclaim is overloaded as PG_readahead in the read path */
 492         if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
 493                 flags ^= BIT(RECLAIM) | BIT(READAHEAD);
 494
 495         if (pme & PM_SOFT_DIRTY)
 496                 flags |= BIT(SOFTDIRTY);
 497         if (pme & PM_FILE)
 498                 flags |= BIT(FILE);
 499         if (pme & PM_SWAP)
 500                 flags |= BIT(SWAP);
 501         if (pme & PM_MMAP_EXCLUSIVE)
 502                 flags |= BIT(MMAP_EXCLUSIVE);
 503
 504         return flags;
 505 }
 506
 507 static uint64_t well_known_flags(uint64_t flags)
 508 {
 509         /* hide flags intended only for kernel hacker */
 510         flags &= ~KPF_HACKERS_BITS;
 511
 512         /* hide non-hugeTLB compound pages */
 513         if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
 514                 flags &= ~BITS_COMPOUND;
 515
 516         return flags;
 517 }
 518
 519 static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme)
 520 {
 521         if (opt_raw)
 522                 flags = expand_overloaded_flags(flags, pme);
 523         else
 524                 flags = well_known_flags(flags);
 525
 526         return flags;
 527 }
 528
 529 /*
 530  * page actions
 531  */
 532
 533 static void prepare_hwpoison_fd(void)
 534 {
 535         char buf[MAX_PATH + 1];
 536
 537         hwpoison_debug_fs = debugfs__mount();
 538         if (!hwpoison_debug_fs) {
 539                 perror("mount debugfs");
 540                 exit(EXIT_FAILURE);
 541         }
 542
 543         if (opt_hwpoison && !hwpoison_inject_fd) {
 544                 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
 545                         hwpoison_debug_fs);
 546                 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
 547         }
 548
 549         if (opt_unpoison && !hwpoison_forget_fd) {
 550                 snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
 551                         hwpoison_debug_fs);
 552                 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
 553         }
 554 }
 555
 556 static int hwpoison_page(unsigned long offset)
 557 {
 558         char buf[100];
 559         int len;
 560
 561         len = sprintf(buf, "0x%lx\n", offset);
 562         len = write(hwpoison_inject_fd, buf, len);
 563         if (len < 0) {
 564                 perror("hwpoison inject");
 565                 return len;
 566         }
 567         return 0;
 568 }
 569
 570 static int unpoison_page(unsigned long offset)
 571 {
 572         char buf[100];
 573         int len;
 574
 575         len = sprintf(buf, "0x%lx\n", offset);
 576         len = write(hwpoison_forget_fd, buf, len);
 577         if (len < 0) {
 578                 perror("hwpoison forget");
 579                 return len;
 580         }
 581         return 0;
 582 }
 583
 584 static int mark_page_idle(unsigned long offset)
 585 {
 586         static unsigned long off;
 587         static uint64_t buf;
 588         int len;
 589
 590         if ((offset / 64 == off / 64) || buf == 0) {
 591                 buf |= 1UL << (offset % 64);
 592                 off = offset;
 593                 return 0;
 594         }
 595
 596         len = pwrite(page_idle_fd, &buf, 8, 8 * (off / 64));
 597         if (len < 0) {
 598                 perror("mark page idle");
 599                 return len;
 600         }
 601
 602         buf = 1UL << (offset % 64);
 603         off = offset;
 604
 605         return 0;
 606 }
 607
 608 /*
 609  * page frame walker
 610  */
 611
 612 static size_t hash_slot(uint64_t flags)
 613 {
 614         size_t k = HASH_KEY(flags);
 615         size_t i;
 616
 617         /* Explicitly reserve slot 0 for flags 0: the following logic
 618          * cannot distinguish an unoccupied slot from slot (flags==0).
 619          */
 620         if (flags == 0)
 621                 return 0;
 622
 623         /* search through the remaining (HASH_SIZE-1) slots */
 624         for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
 625                 if (!k || k >= ARRAY_SIZE(page_flags))
 626                         k = 1;
 627                 if (page_flags[k] == 0) {
 628                         page_flags[k] = flags;
 629                         return k;
 630                 }
 631                 if (page_flags[k] == flags)
 632                         return k;
 633         }
 634
 635         fatal("hash table full: bump up HASH_SHIFT?\n");
 636         exit(EXIT_FAILURE);
 637 }
 638
 639 static void add_page(unsigned long voffset, unsigned long offset,
 640                      uint64_t flags, uint64_t cgroup, uint64_t mapcnt,
 641                      uint64_t pme)
 642 {
 643         flags = kpageflags_flags(flags, pme);
 644
 645         if (!bit_mask_ok(flags))
 646                 return;
 647
 648         if (opt_cgroup && cgroup != (uint64_t)opt_cgroup)
 649                 return;
 650
 651         if (opt_hwpoison)
 652                 hwpoison_page(offset);
 653         if (opt_unpoison)
 654                 unpoison_page(offset);
 655
 656         if (opt_mark_idle)
 657                 mark_page_idle(offset);
 658
 659         if (opt_list == 1)
 660                 show_page_range(voffset, offset, 1, flags, cgroup, mapcnt);
 661         else if (opt_list == 2)
 662                 show_page(voffset, offset, flags, cgroup, mapcnt);
 663
 664         nr_pages[hash_slot(flags)]++;
 665         total_pages++;
 666 }
 667
 668 #define KPAGEFLAGS_BATCH        (64 << 10)      /* 64k pages */
 669 static void walk_pfn(unsigned long voffset,
 670                      unsigned long index,
 671                      unsigned long count,
 672                      uint64_t pme)
 673 {
 674         uint64_t buf[KPAGEFLAGS_BATCH];
 675         uint64_t cgi[KPAGEFLAGS_BATCH];
 676         uint64_t cnt[KPAGEFLAGS_BATCH];
 677         unsigned long batch;
 678         unsigned long pages;
 679         unsigned long i;
 680
 681         /*
 682          * kpagecgroup_read() reads only if kpagecgroup were opened, but
 683          * /proc/kpagecgroup might even not exist, so it's better to fill
 684          * them with zeros here.
 685          */
 686         if (count == 1)
 687                 cgi[0] = 0;
 688         else
 689                 memset(cgi, 0, sizeof cgi);
 690
 691         while (count) {
 692                 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
 693                 pages = kpageflags_read(buf, index, batch);
 694                 if (pages == 0)
 695                         break;
 696
 697                 if (kpagecgroup_read(cgi, index, pages) != pages)
 698                         fatal("kpagecgroup returned fewer pages than expected");
 699
 700                 if (kpagecount_read(cnt, index, pages) != pages)
 701                         fatal("kpagecount returned fewer pages than expected");
 702
 703                 for (i = 0; i < pages; i++)
 704                         add_page(voffset + i, index + i,
 705                                  buf[i], cgi[i], cnt[i], pme);
 706
 707                 index += pages;
 708                 count -= pages;
 709         }
 710 }
 711
 712 static void walk_swap(unsigned long voffset, uint64_t pme)
 713 {
 714         uint64_t flags = kpageflags_flags(0, pme);
 715
 716         if (!bit_mask_ok(flags))
 717                 return;
 718
 719         if (opt_cgroup)
 720                 return;
 721
 722         if (opt_list == 1)
 723                 show_page_range(voffset, pagemap_swap_offset(pme),
 724                                 1, flags, 0, 0);
 725         else if (opt_list == 2)
 726                 show_page(voffset, pagemap_swap_offset(pme), flags, 0, 0);
 727
 728         nr_pages[hash_slot(flags)]++;
 729         total_pages++;
 730 }
 731
 732 #define PAGEMAP_BATCH   (64 << 10)
 733 static void walk_vma(unsigned long index, unsigned long count)
 734 {
 735         uint64_t buf[PAGEMAP_BATCH];
 736         unsigned long batch;
 737         unsigned long pages;
 738         unsigned long pfn;
 739         unsigned long i;
 740
 741         while (count) {
 742                 batch = min_t(unsigned long, count, PAGEMAP_BATCH);
 743                 pages = pagemap_read(buf, index, batch);
 744                 if (pages == 0)
 745                         break;
 746
 747                 for (i = 0; i < pages; i++) {
 748                         pfn = pagemap_pfn(buf[i]);
 749                         if (pfn)
 750                                 walk_pfn(index + i, pfn, 1, buf[i]);
 751                         if (buf[i] & PM_SWAP)
 752                                 walk_swap(index + i, buf[i]);
 753                 }
 754
 755                 index += pages;
 756                 count -= pages;
 757         }
 758 }
 759
 760 static void walk_task(unsigned long index, unsigned long count)
 761 {
 762         const unsigned long end = index + count;
 763         unsigned long start;
 764         int i = 0;
 765
 766         while (index < end) {
 767
 768                 while (pg_end[i] <= index)
 769                         if (++i >= nr_vmas)
 770                                 return;
 771                 if (pg_start[i] >= end)
 772                         return;
 773
 774                 start = max_t(unsigned long, pg_start[i], index);
 775                 index = min_t(unsigned long, pg_end[i], end);
 776
 777                 assert(start < index);
 778                 walk_vma(start, index - start);
 779         }
 780 }
 781
 782 static void add_addr_range(unsigned long offset, unsigned long size)
 783 {
 784         if (nr_addr_ranges >= MAX_ADDR_RANGES)
 785                 fatal("too many addr ranges\n");
 786
 787         opt_offset[nr_addr_ranges] = offset;
 788         opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
 789         nr_addr_ranges++;
 790 }
 791
 792 static void walk_addr_ranges(void)
 793 {
 794         int i;
 795
 796         kpageflags_fd = checked_open(opt_kpageflags, O_RDONLY);
 797
 798         if (!nr_addr_ranges)
 799                 add_addr_range(0, ULONG_MAX);
 800
 801         for (i = 0; i < nr_addr_ranges; i++)
 802                 if (!opt_pid)
 803                         walk_pfn(opt_offset[i], opt_offset[i], opt_size[i], 0);
 804                 else
 805                         walk_task(opt_offset[i], opt_size[i]);
 806
 807         if (opt_mark_idle)
 808                 mark_page_idle(0);
 809
 810         close(kpageflags_fd);
 811 }
 812
 813
 814 /*
 815  * user interface
 816  */
 817
 818 static const char *page_flag_type(uint64_t flag)
 819 {
 820         if (flag & KPF_HACKERS_BITS)
 821                 return "(r)";
 822         if (flag & KPF_OVERLOADED_BITS)
 823                 return "(o)";
 824         return "   ";
 825 }
 826
 827 static void usage(void)
 828 {
 829         size_t i, j;
 830
 831         printf(
 832 "page-types [options]\n"
 833 "            -r|--raw                   Raw mode, for kernel developers\n"
 834 "            -d|--describe flags        Describe flags\n"
 835 "            -a|--addr    addr-spec     Walk a range of pages\n"
 836 "            -b|--bits    bits-spec     Walk pages with specified bits\n"
 837 "            -c|--cgroup  path|@inode   Walk pages within memory cgroup\n"
 838 "            -p|--pid     pid           Walk process address space\n"
 839 "            -f|--file    filename      Walk file address space\n"
 840 "            -i|--mark-idle             Mark pages idle\n"
 841 "            -l|--list                  Show page details in ranges\n"
 842 "            -L|--list-each             Show page details one by one\n"
 843 "            -C|--list-cgroup           Show cgroup inode for pages\n"
 844 "            -M|--list-mapcnt           Show page map count\n"
 845 "            -N|--no-summary            Don't show summary info\n"
 846 "            -X|--hwpoison              hwpoison pages\n"
 847 "            -x|--unpoison              unpoison pages\n"
 848 "            -F|--kpageflags filename   kpageflags file to parse\n"
 849 "            -h|--help                  Show this usage message\n"
 850 "flags:\n"
 851 "            0x10                       bitfield format, e.g.\n"
 852 "            anon                       bit-name, e.g.\n"
 853 "            0x10,anon                  comma-separated list, e.g.\n"
 854 "addr-spec:\n"
 855 "            N                          one page at offset N (unit: pages)\n"
 856 "            N+M                        pages range from N to N+M-1\n"
 857 "            N,M                        pages range from N to M-1\n"
 858 "            N,                         pages range from N to end\n"
 859 "            ,M                         pages range from 0 to M-1\n"
 860 "bits-spec:\n"
 861 "            bit1,bit2                  (flags & (bit1|bit2)) != 0\n"
 862 "            bit1,bit2=bit1             (flags & (bit1|bit2)) == bit1\n"
 863 "            bit1,~bit2                 (flags & (bit1|bit2)) == bit1\n"
 864 "            =bit1,bit2                 flags == (bit1|bit2)\n"
 865 "bit-names:\n"
 866         );
 867
 868         for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
 869                 if (!page_flag_names[i])
 870                         continue;
 871                 printf("%16s%s", page_flag_names[i] + 2,
 872                                  page_flag_type(1ULL << i));
 873                 if (++j > 3) {
 874                         j = 0;
 875                         putchar('\n');
 876                 }
 877         }
 878         printf("\n                                   "
 879                 "(r) raw mode bits  (o) overloaded bits\n");
 880 }
 881
 882 static unsigned long long parse_number(const char *str)
 883 {
 884         unsigned long long n;
 885
 886         n = strtoll(str, NULL, 0);
 887
 888         if (n == 0 && str[0] != '0')
 889                 fatal("invalid name or number: %s\n", str);
 890
 891         return n;
 892 }
 893
 894 static void parse_pid(const char *str)
 895 {
 896         FILE *file;
 897         char buf[5000];
 898
 899         opt_pid = parse_number(str);
 900
 901         sprintf(buf, "/proc/%d/pagemap", opt_pid);
 902         pagemap_fd = checked_open(buf, O_RDONLY);
 903
 904         sprintf(buf, "/proc/%d/maps", opt_pid);
 905         file = fopen(buf, "r");
 906         if (!file) {
 907                 perror(buf);
 908                 exit(EXIT_FAILURE);
 909         }
 910
 911         while (fgets(buf, sizeof(buf), file) != NULL) {
 912                 unsigned long vm_start;
 913                 unsigned long vm_end;
 914                 unsigned long long pgoff;
 915                 int major, minor;
 916                 char r, w, x, s;
 917                 unsigned long ino;
 918                 int n;
 919
 920                 n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
 921                            &vm_start,
 922                            &vm_end,
 923                            &r, &w, &x, &s,
 924                            &pgoff,
 925                            &major, &minor,
 926                            &ino);
 927                 if (n < 10) {
 928                         fprintf(stderr, "unexpected line: %s\n", buf);
 929                         continue;
 930                 }
 931                 pg_start[nr_vmas] = vm_start / page_size;
 932                 pg_end[nr_vmas] = vm_end / page_size;
 933                 if (++nr_vmas >= MAX_VMAS) {
 934                         fprintf(stderr, "too many VMAs\n");
 935                         break;
 936                 }
 937         }
 938         fclose(file);
 939 }
 940
 941 static void show_file(const char *name, const struct stat *st)
 942 {
 943         unsigned long long size = st->st_size;
 944         char atime[64], mtime[64];
 945         long now = time(NULL);
 946
 947         printf("%s\tInode: %u\tSize: %llu (%llu pages)\n",
 948                         name, (unsigned)st->st_ino,
 949                         size, (size + page_size - 1) / page_size);
 950
 951         strftime(atime, sizeof(atime), "%c", localtime(&st->st_atime));
 952         strftime(mtime, sizeof(mtime), "%c", localtime(&st->st_mtime));
 953
 954         printf("Modify: %s (%ld seconds ago)\nAccess: %s (%ld seconds ago)\n",
 955                         mtime, now - st->st_mtime,
 956                         atime, now - st->st_atime);
 957 }
 958
 959 static sigjmp_buf sigbus_jmp;
 960
 961 static void * volatile sigbus_addr;
 962
 963 static void sigbus_handler(int sig, siginfo_t *info, void *ucontex)
 964 {
 965         (void)sig;
 966         (void)ucontex;
 967         sigbus_addr = info ? info->si_addr : NULL;
 968         siglongjmp(sigbus_jmp, 1);
 969 }
 970
 971 static struct sigaction sigbus_action = {
 972         .sa_sigaction = sigbus_handler,
 973         .sa_flags = SA_SIGINFO,
 974 };
 975
 976 static void walk_file_range(const char *name, int fd,
 977                             unsigned long off, unsigned long end)
 978 {
 979         uint8_t vec[PAGEMAP_BATCH];
 980         uint64_t buf[PAGEMAP_BATCH], flags;
 981         uint64_t cgroup = 0;
 982         uint64_t mapcnt = 0;
 983         unsigned long nr_pages, pfn, i;
 984         ssize_t len;
 985         void *ptr;
 986         int first = 1;
 987
 988         for (; off < end; off += len) {
 989                 nr_pages = (end - off + page_size - 1) / page_size;
 990                 if (nr_pages > PAGEMAP_BATCH)
 991                         nr_pages = PAGEMAP_BATCH;
 992                 len = nr_pages * page_size;
 993
 994                 ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, off);
 995                 if (ptr == MAP_FAILED)
 996                         fatal("mmap failed: %s", name);
 997
 998                 /* determine cached pages */
 999                 if (mincore(ptr, len, vec))
1000                         fatal("mincore failed: %s", name);
1001
1002                 /* turn off readahead */
1003                 if (madvise(ptr, len, MADV_RANDOM))
1004                         fatal("madvice failed: %s", name);
1005
1006                 if (sigsetjmp(sigbus_jmp, 1)) {
1007                         end = off + sigbus_addr ? sigbus_addr - ptr : 0;
1008                         fprintf(stderr, "got sigbus at offset %lld: %s\n",
1009                                         (long long)end, name);
1010                         goto got_sigbus;
1011                 }
1012
1013                 /* populate ptes */
1014                 for (i = 0; i < nr_pages ; i++) {
1015                         if (vec[i] & 1)
1016                                 (void)*(volatile int *)(ptr + i * page_size);
1017                 }
1018 got_sigbus:
1019
1020                 /* turn off harvesting reference bits */
1021                 if (madvise(ptr, len, MADV_SEQUENTIAL))
1022                         fatal("madvice failed: %s", name);
1023
1024                 if (pagemap_read(buf, (unsigned long)ptr / page_size,
1025                                         nr_pages) != nr_pages)
1026                         fatal("cannot read pagemap");
1027
1028                 munmap(ptr, len);
1029
1030                 for (i = 0; i < nr_pages; i++) {
1031                         pfn = pagemap_pfn(buf[i]);
1032                         if (!pfn)
1033                                 continue;
1034                         if (!kpageflags_read(&flags, pfn, 1))
1035                                 continue;
1036                         if (!kpagecgroup_read(&cgroup, pfn, 1))
1037                                 fatal("kpagecgroup_read failed");
1038                         if (!kpagecount_read(&mapcnt, pfn, 1))
1039                                 fatal("kpagecount_read failed");
1040                         if (first && opt_list) {
1041                                 first = 0;
1042                                 flush_page_range();
1043                         }
1044                         add_page(off / page_size + i, pfn,
1045                                  flags, cgroup, mapcnt, buf[i]);
1046                 }
1047         }
1048 }
1049
1050 static void walk_file(const char *name, const struct stat *st)
1051 {
1052         int i;
1053         int fd;
1054
1055         fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
1056
1057         if (!nr_addr_ranges)
1058                 add_addr_range(0, st->st_size / page_size);
1059
1060         for (i = 0; i < nr_addr_ranges; i++)
1061                 walk_file_range(name, fd, opt_offset[i] * page_size,
1062                                 (opt_offset[i] + opt_size[i]) * page_size);
1063
1064         close(fd);
1065 }
1066
1067 int walk_tree(const char *name, const struct stat *st, int type, struct FTW *f)
1068 {
1069         (void)f;
1070         switch (type) {
1071         case FTW_F:
1072                 if (S_ISREG(st->st_mode))
1073                         walk_file(name, st);
1074                 break;
1075         case FTW_DNR:
1076                 fprintf(stderr, "cannot read dir: %s\n", name);
1077                 break;
1078         }
1079         return 0;
1080 }
1081
1082 struct stat st;
1083
1084 static void walk_page_cache(void)
1085 {
1086         kpageflags_fd = checked_open(opt_kpageflags, O_RDONLY);
1087         pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY);
1088         sigaction(SIGBUS, &sigbus_action, NULL);
1089
1090         if (stat(opt_file, &st))
1091                 fatal("stat failed: %s\n", opt_file);
1092
1093         if (S_ISREG(st.st_mode)) {
1094                 walk_file(opt_file, &st);
1095         } else if (S_ISDIR(st.st_mode)) {
1096                 /* do not follow symlinks and mountpoints */
1097                 if (nftw(opt_file, walk_tree, 64, FTW_MOUNT | FTW_PHYS) < 0)
1098                         fatal("nftw failed: %s\n", opt_file);
1099         } else
1100                 fatal("unhandled file type: %s\n", opt_file);
1101
1102         close(kpageflags_fd);
1103         close(pagemap_fd);
1104         signal(SIGBUS, SIG_DFL);
1105 }
1106
1107 static void parse_file(const char *name)
1108 {
1109         opt_file = name;
1110 }
1111
1112 static void parse_cgroup(const char *path)
1113 {
1114         if (path[0] == '@') {
1115                 opt_cgroup = parse_number(path + 1);
1116                 return;
1117         }
1118
1119         struct stat st;
1120
1121         if (stat(path, &st))
1122                 fatal("stat failed: %s: %m\n", path);
1123
1124         if (!S_ISDIR(st.st_mode))
1125                 fatal("cgroup supposed to be a directory: %s\n", path);
1126
1127         opt_cgroup = st.st_ino;
1128 }
1129
1130 static void parse_addr_range(const char *optarg)
1131 {
1132         unsigned long offset;
1133         unsigned long size;
1134         char *p;
1135
1136         p = strchr(optarg, ',');
1137         if (!p)
1138                 p = strchr(optarg, '+');
1139
1140         if (p == optarg) {
1141                 offset = 0;
1142                 size   = parse_number(p + 1);
1143         } else if (p) {
1144                 offset = parse_number(optarg);
1145                 if (p[1] == '\0')
1146                         size = ULONG_MAX;
1147                 else {
1148                         size = parse_number(p + 1);
1149                         if (*p == ',') {
1150                                 if (size < offset)
1151                                         fatal("invalid range: %lu,%lu\n",
1152                                                         offset, size);
1153                                 size -= offset;
1154                         }
1155                 }
1156         } else {
1157                 offset = parse_number(optarg);
1158                 size   = 1;
1159         }
1160
1161         add_addr_range(offset, size);
1162 }
1163
1164 static void add_bits_filter(uint64_t mask, uint64_t bits)
1165 {
1166         if (nr_bit_filters >= MAX_BIT_FILTERS)
1167                 fatal("too much bit filters\n");
1168
1169         opt_mask[nr_bit_filters] = mask;
1170         opt_bits[nr_bit_filters] = bits;
1171         nr_bit_filters++;
1172 }
1173
1174 static uint64_t parse_flag_name(const char *str, int len)
1175 {
1176         size_t i;
1177
1178         if (!*str || !len)
1179                 return 0;
1180
1181         if (len <= 8 && !strncmp(str, "compound", len))
1182                 return BITS_COMPOUND;
1183
1184         for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
1185                 if (!page_flag_names[i])
1186                         continue;
1187                 if (!strncmp(str, page_flag_names[i] + 2, len))
1188                         return 1ULL << i;
1189         }
1190
1191         return parse_number(str);
1192 }
1193
1194 static uint64_t parse_flag_names(const char *str, int all)
1195 {
1196         const char *p    = str;
1197         uint64_t   flags = 0;
1198
1199         while (1) {
1200                 if (*p == ',' || *p == '=' || *p == '\0') {
1201                         if ((*str != '~') || (*str == '~' && all && *++str))
1202                                 flags |= parse_flag_name(str, p - str);
1203                         if (*p != ',')
1204                                 break;
1205                         str = p + 1;
1206                 }
1207                 p++;
1208         }
1209
1210         return flags;
1211 }
1212
1213 static void parse_bits_mask(const char *optarg)
1214 {
1215         uint64_t mask;
1216         uint64_t bits;
1217         const char *p;
1218
1219         p = strchr(optarg, '=');
1220         if (p == optarg) {
1221                 mask = KPF_ALL_BITS;
1222                 bits = parse_flag_names(p + 1, 0);
1223         } else if (p) {
1224                 mask = parse_flag_names(optarg, 0);
1225                 bits = parse_flag_names(p + 1, 0);
1226         } else if (strchr(optarg, '~')) {
1227                 mask = parse_flag_names(optarg, 1);
1228                 bits = parse_flag_names(optarg, 0);
1229         } else {
1230                 mask = parse_flag_names(optarg, 0);
1231                 bits = KPF_ALL_BITS;
1232         }
1233
1234         add_bits_filter(mask, bits);
1235 }
1236
1237 static void parse_kpageflags(const char *name)
1238 {
1239         opt_kpageflags = name;
1240 }
1241
1242 static void describe_flags(const char *optarg)
1243 {
1244         uint64_t flags = parse_flag_names(optarg, 0);
1245
1246         printf("0x%016llx\t%s\t%s\n",
1247                 (unsigned long long)flags,
1248                 page_flag_name(flags),
1249                 page_flag_longname(flags));
1250 }
1251
1252 static const struct option opts[] = {
1253         { "raw"       , 0, NULL, 'r' },
1254         { "pid"       , 1, NULL, 'p' },
1255         { "file"      , 1, NULL, 'f' },
1256         { "addr"      , 1, NULL, 'a' },
1257         { "bits"      , 1, NULL, 'b' },
1258         { "cgroup"    , 1, NULL, 'c' },
1259         { "describe"  , 1, NULL, 'd' },
1260         { "mark-idle" , 0, NULL, 'i' },
1261         { "list"      , 0, NULL, 'l' },
1262         { "list-each" , 0, NULL, 'L' },
1263         { "list-cgroup", 0, NULL, 'C' },
1264         { "list-mapcnt", 0, NULL, 'M' },
1265         { "no-summary", 0, NULL, 'N' },
1266         { "hwpoison"  , 0, NULL, 'X' },
1267         { "unpoison"  , 0, NULL, 'x' },
1268         { "kpageflags", 0, NULL, 'F' },
1269         { "help"      , 0, NULL, 'h' },
1270         { NULL        , 0, NULL, 0 }
1271 };
1272
1273 int main(int argc, char *argv[])
1274 {
1275         int c;
1276
1277         page_size = getpagesize();
1278
1279         while ((c = getopt_long(argc, argv,
1280                                 "rp:f:a:b:d:c:CilLMNXxF:h",
1281                                 opts, NULL)) != -1) {
1282                 switch (c) {
1283                 case 'r':
1284                         opt_raw = 1;
1285                         break;
1286                 case 'p':
1287                         parse_pid(optarg);
1288                         break;
1289                 case 'f':
1290                         parse_file(optarg);
1291                         break;
1292                 case 'a':
1293                         parse_addr_range(optarg);
1294                         break;
1295                 case 'b':
1296                         parse_bits_mask(optarg);
1297                         break;
1298                 case 'c':
1299                         parse_cgroup(optarg);
1300                         break;
1301                 case 'C':
1302                         opt_list_cgroup = 1;
1303                         break;
1304                 case 'd':
1305                         describe_flags(optarg);
1306                         exit(0);
1307                 case 'i':
1308                         opt_mark_idle = 1;
1309                         break;
1310                 case 'l':
1311                         opt_list = 1;
1312                         break;
1313                 case 'L':
1314                         opt_list = 2;
1315                         break;
1316                 case 'M':
1317                         opt_list_mapcnt = 1;
1318                         break;
1319                 case 'N':
1320                         opt_no_summary = 1;
1321                         break;
1322                 case 'X':
1323                         opt_hwpoison = 1;
1324                         prepare_hwpoison_fd();
1325                         break;
1326                 case 'x':
1327                         opt_unpoison = 1;
1328                         prepare_hwpoison_fd();
1329                         break;
1330                 case 'F':
1331                         parse_kpageflags(optarg);
1332                         break;
1333                 case 'h':
1334                         usage();
1335                         exit(0);
1336                 default:
1337                         usage();
1338                         exit(1);
1339                 }
1340         }
1341
1342         if (!opt_kpageflags)
1343                 opt_kpageflags = PROC_KPAGEFLAGS;
1344
1345         if (opt_cgroup || opt_list_cgroup)
1346                 kpagecgroup_fd = checked_open(PROC_KPAGECGROUP, O_RDONLY);
1347
1348         if (opt_list && opt_list_mapcnt)
1349                 kpagecount_fd = checked_open(PROC_KPAGECOUNT, O_RDONLY);
1350
1351         if (opt_mark_idle)
1352                 page_idle_fd = checked_open(SYS_KERNEL_MM_PAGE_IDLE, O_RDWR);
1353
1354         if (opt_list && opt_pid)
1355                 printf("voffset\t");
1356         if (opt_list && opt_file)
1357                 printf("foffset\t");
1358         if (opt_list && opt_list_cgroup)
1359                 printf("cgroup\t");
1360         if (opt_list && opt_list_mapcnt)
1361                 printf("map-cnt\t");
1362
1363         if (opt_list == 1)
1364                 printf("offset\tlen\tflags\n");
1365         if (opt_list == 2)
1366                 printf("offset\tflags\n");
1367
1368         if (opt_file)
1369                 walk_page_cache();
1370         else
1371                 walk_addr_ranges();
1372
1373         if (opt_list == 1)
1374                 flush_page_range();
1375
1376         if (opt_no_summary)
1377                 return 0;
1378
1379         if (opt_list)
1380                 printf("\n\n");
1381
1382         if (opt_file) {
1383                 show_file(opt_file, &st);
1384                 printf("\n");
1385         }
1386
1387         show_summary();
1388
1389         if (opt_list_mapcnt)
1390                 close(kpagecount_fd);
1391
1392         if (page_idle_fd >= 0)
1393                 close(page_idle_fd);
1394
1395         return 0;
1396 }