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ext4: reduce contention on s_orphan_lock
[linux/fpc-iii.git] / tools / vm / page-types.c
blob05654f5e48d5f527939e2dfe62d98310f3831edb
1 /*
2 * page-types: Tool for querying page flags
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the Free
6 * Software Foundation; version 2.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should find a copy of v2 of the GNU General Public License somewhere on
14 * your Linux system; if not, write to the Free Software Foundation, Inc., 59
15 * Temple Place, Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Copyright (C) 2009 Intel corporation
18 *
19 * Authors: Wu Fengguang <fengguang.wu@intel.com>
20 */
21
22 #define _FILE_OFFSET_BITS 64
23 #define _GNU_SOURCE
24 #include <stdio.h>
25 #include <stdlib.h>
26 #include <unistd.h>
27 #include <stdint.h>
28 #include <stdarg.h>
29 #include <string.h>
30 #include <getopt.h>
31 #include <limits.h>
32 #include <assert.h>
33 #include <ftw.h>
34 #include <time.h>
35 #include <sys/types.h>
36 #include <sys/errno.h>
37 #include <sys/fcntl.h>
38 #include <sys/mount.h>
39 #include <sys/statfs.h>
40 #include <sys/mman.h>
41 #include "../../include/uapi/linux/magic.h"
42 #include "../../include/uapi/linux/kernel-page-flags.h"
43 #include <api/fs/debugfs.h>
44
45 #ifndef MAX_PATH
46 # define MAX_PATH 256
47 #endif
48
49 #ifndef STR
50 # define _STR(x) #x
51 # define STR(x) _STR(x)
52 #endif
53
54 /*
55 * pagemap kernel ABI bits
56 */
57
58 #define PM_ENTRY_BYTES sizeof(uint64_t)
59 #define PM_STATUS_BITS 3
60 #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
61 #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
62 #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
63 #define PM_PSHIFT_BITS 6
64 #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
65 #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
66 #define __PM_PSHIFT(x) (((uint64_t) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
67 #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
68 #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
69
70 #define __PM_SOFT_DIRTY (1LL)
71 #define PM_PRESENT PM_STATUS(4LL)
72 #define PM_SWAP PM_STATUS(2LL)
73 #define PM_SOFT_DIRTY __PM_PSHIFT(__PM_SOFT_DIRTY)
74
75
76 /*
77 * kernel page flags
78 */
79
80 #define KPF_BYTES 8
81 #define PROC_KPAGEFLAGS "/proc/kpageflags"
82
83 /* [32-] kernel hacking assistances */
84 #define KPF_RESERVED 32
85 #define KPF_MLOCKED 33
86 #define KPF_MAPPEDTODISK 34
87 #define KPF_PRIVATE 35
88 #define KPF_PRIVATE_2 36
89 #define KPF_OWNER_PRIVATE 37
90 #define KPF_ARCH 38
91 #define KPF_UNCACHED 39
92 #define KPF_SOFTDIRTY 40
93
94 /* [48-] take some arbitrary free slots for expanding overloaded flags
95 * not part of kernel API
96 */
97 #define KPF_READAHEAD 48
98 #define KPF_SLOB_FREE 49
99 #define KPF_SLUB_FROZEN 50
100 #define KPF_SLUB_DEBUG 51
101
102 #define KPF_ALL_BITS ((uint64_t)~0ULL)
103 #define KPF_HACKERS_BITS (0xffffULL << 32)
104 #define KPF_OVERLOADED_BITS (0xffffULL << 48)
105 #define BIT(name) (1ULL << KPF_##name)
106 #define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
107
108 static const char * const page_flag_names[] = {
109 [KPF_LOCKED] = "L:locked",
110 [KPF_ERROR] = "E:error",
111 [KPF_REFERENCED] = "R:referenced",
112 [KPF_UPTODATE] = "U:uptodate",
113 [KPF_DIRTY] = "D:dirty",
114 [KPF_LRU] = "l:lru",
115 [KPF_ACTIVE] = "A:active",
116 [KPF_SLAB] = "S:slab",
117 [KPF_WRITEBACK] = "W:writeback",
118 [KPF_RECLAIM] = "I:reclaim",
119 [KPF_BUDDY] = "B:buddy",
120
121 [KPF_MMAP] = "M:mmap",
122 [KPF_ANON] = "a:anonymous",
123 [KPF_SWAPCACHE] = "s:swapcache",
124 [KPF_SWAPBACKED] = "b:swapbacked",
125 [KPF_COMPOUND_HEAD] = "H:compound_head",
126 [KPF_COMPOUND_TAIL] = "T:compound_tail",
127 [KPF_HUGE] = "G:huge",
128 [KPF_UNEVICTABLE] = "u:unevictable",
129 [KPF_HWPOISON] = "X:hwpoison",
130 [KPF_NOPAGE] = "n:nopage",
131 [KPF_KSM] = "x:ksm",
132 [KPF_THP] = "t:thp",
133
134 [KPF_RESERVED] = "r:reserved",
135 [KPF_MLOCKED] = "m:mlocked",
136 [KPF_MAPPEDTODISK] = "d:mappedtodisk",
137 [KPF_PRIVATE] = "P:private",
138 [KPF_PRIVATE_2] = "p:private_2",
139 [KPF_OWNER_PRIVATE] = "O:owner_private",
140 [KPF_ARCH] = "h:arch",
141 [KPF_UNCACHED] = "c:uncached",
142 [KPF_SOFTDIRTY] = "f:softdirty",
143
144 [KPF_READAHEAD] = "I:readahead",
145 [KPF_SLOB_FREE] = "P:slob_free",
146 [KPF_SLUB_FROZEN] = "A:slub_frozen",
147 [KPF_SLUB_DEBUG] = "E:slub_debug",
148 };
149
150
151 static const char * const debugfs_known_mountpoints[] = {
152 "/sys/kernel/debug",
153 "/debug",
154 0,
155 };
156
157 /*
158 * data structures
159 */
160
161 static int opt_raw; /* for kernel developers */
162 static int opt_list; /* list pages (in ranges) */
163 static int opt_no_summary; /* don't show summary */
164 static pid_t opt_pid; /* process to walk */
165 const char * opt_file;
166
167 #define MAX_ADDR_RANGES 1024
168 static int nr_addr_ranges;
169 static unsigned long opt_offset[MAX_ADDR_RANGES];
170 static unsigned long opt_size[MAX_ADDR_RANGES];
171
172 #define MAX_VMAS 10240
173 static int nr_vmas;
174 static unsigned long pg_start[MAX_VMAS];
175 static unsigned long pg_end[MAX_VMAS];
176
177 #define MAX_BIT_FILTERS 64
178 static int nr_bit_filters;
179 static uint64_t opt_mask[MAX_BIT_FILTERS];
180 static uint64_t opt_bits[MAX_BIT_FILTERS];
181
182 static int page_size;
183
184 static int pagemap_fd;
185 static int kpageflags_fd;
186
187 static int opt_hwpoison;
188 static int opt_unpoison;
189
190 static char *hwpoison_debug_fs;
191 static int hwpoison_inject_fd;
192 static int hwpoison_forget_fd;
193
194 #define HASH_SHIFT 13
195 #define HASH_SIZE (1 << HASH_SHIFT)
196 #define HASH_MASK (HASH_SIZE - 1)
197 #define HASH_KEY(flags) (flags & HASH_MASK)
198
199 static unsigned long total_pages;
200 static unsigned long nr_pages[HASH_SIZE];
201 static uint64_t page_flags[HASH_SIZE];
202
203
204 /*
205 * helper functions
206 */
207
208 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
209
210 #define min_t(type, x, y) ({ \
211 type __min1 = (x); \
212 type __min2 = (y); \
213 __min1 < __min2 ? __min1 : __min2; })
214
215 #define max_t(type, x, y) ({ \
216 type __max1 = (x); \
217 type __max2 = (y); \
218 __max1 > __max2 ? __max1 : __max2; })
219
220 static unsigned long pages2mb(unsigned long pages)
221 {
222 return (pages * page_size) >> 20;
223 }
224
225 static void fatal(const char *x, ...)
226 {
227 va_list ap;
228
229 va_start(ap, x);
230 vfprintf(stderr, x, ap);
231 va_end(ap);
232 exit(EXIT_FAILURE);
233 }
234
235 static int checked_open(const char *pathname, int flags)
236 {
237 int fd = open(pathname, flags);
238
239 if (fd < 0) {
240 perror(pathname);
241 exit(EXIT_FAILURE);
242 }
243
244 return fd;
245 }
246
247 /*
248 * pagemap/kpageflags routines
249 */
250
251 static unsigned long do_u64_read(int fd, char *name,
252 uint64_t *buf,
253 unsigned long index,
254 unsigned long count)
255 {
256 long bytes;
257
258 if (index > ULONG_MAX / 8)
259 fatal("index overflow: %lu\n", index);
260
261 bytes = pread(fd, buf, count * 8, (off_t)index * 8);
262 if (bytes < 0) {
263 perror(name);
264 exit(EXIT_FAILURE);
265 }
266 if (bytes % 8)
267 fatal("partial read: %lu bytes\n", bytes);
268
269 return bytes / 8;
270 }
271
272 static unsigned long kpageflags_read(uint64_t *buf,
273 unsigned long index,
274 unsigned long pages)
275 {
276 return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages);
277 }
278
279 static unsigned long pagemap_read(uint64_t *buf,
280 unsigned long index,
281 unsigned long pages)
282 {
283 return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
284 }
285
286 static unsigned long pagemap_pfn(uint64_t val)
287 {
288 unsigned long pfn;
289
290 if (val & PM_PRESENT)
291 pfn = PM_PFRAME(val);
292 else
293 pfn = 0;
294
295 return pfn;
296 }
297
298
299 /*
300 * page flag names
301 */
302
303 static char *page_flag_name(uint64_t flags)
304 {
305 static char buf[65];
306 int present;
307 size_t i, j;
308
309 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
310 present = (flags >> i) & 1;
311 if (!page_flag_names[i]) {
312 if (present)
313 fatal("unknown flag bit %d\n", i);
314 continue;
315 }
316 buf[j++] = present ? page_flag_names[i][0] : '_';
317 }
318
319 return buf;
320 }
321
322 static char *page_flag_longname(uint64_t flags)
323 {
324 static char buf[1024];
325 size_t i, n;
326
327 for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
328 if (!page_flag_names[i])
329 continue;
330 if ((flags >> i) & 1)
331 n += snprintf(buf + n, sizeof(buf) - n, "%s,",
332 page_flag_names[i] + 2);
333 }
334 if (n)
335 n--;
336 buf[n] = '\0';
337
338 return buf;
339 }
340
341
342 /*
343 * page list and summary
344 */
345
346 static void show_page_range(unsigned long voffset, unsigned long offset,
347 unsigned long size, uint64_t flags)
348 {
349 static uint64_t flags0;
350 static unsigned long voff;
351 static unsigned long index;
352 static unsigned long count;
353
354 if (flags == flags0 && offset == index + count &&
355 size && voffset == voff + count) {
356 count += size;
357 return;
358 }
359
360 if (count) {
361 if (opt_pid)
362 printf("%lx\t", voff);
363 if (opt_file)
364 printf("%lu\t", voff);
365 printf("%lx\t%lx\t%s\n",
366 index, count, page_flag_name(flags0));
367 }
368
369 flags0 = flags;
370 index = offset;
371 voff = voffset;
372 count = size;
373 }
374
375 static void flush_page_range(void)
376 {
377 show_page_range(0, 0, 0, 0);
378 }
379
380 static void show_page(unsigned long voffset,
381 unsigned long offset, uint64_t flags)
382 {
383 if (opt_pid)
384 printf("%lx\t", voffset);
385 if (opt_file)
386 printf("%lu\t", voffset);
387 printf("%lx\t%s\n", offset, page_flag_name(flags));
388 }
389
390 static void show_summary(void)
391 {
392 size_t i;
393
394 printf(" flags\tpage-count MB"
395 " symbolic-flags\t\t\tlong-symbolic-flags\n");
396
397 for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
398 if (nr_pages[i])
399 printf("0x%016llx\t%10lu %8lu %s\t%s\n",
400 (unsigned long long)page_flags[i],
401 nr_pages[i],
402 pages2mb(nr_pages[i]),
403 page_flag_name(page_flags[i]),
404 page_flag_longname(page_flags[i]));
405 }
406
407 printf(" total\t%10lu %8lu\n",
408 total_pages, pages2mb(total_pages));
409 }
410
411
412 /*
413 * page flag filters
414 */
415
416 static int bit_mask_ok(uint64_t flags)
417 {
418 int i;
419
420 for (i = 0; i < nr_bit_filters; i++) {
421 if (opt_bits[i] == KPF_ALL_BITS) {
422 if ((flags & opt_mask[i]) == 0)
423 return 0;
424 } else {
425 if ((flags & opt_mask[i]) != opt_bits[i])
426 return 0;
427 }
428 }
429
430 return 1;
431 }
432
433 static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
434 {
435 /* SLOB/SLUB overload several page flags */
436 if (flags & BIT(SLAB)) {
437 if (flags & BIT(PRIVATE))
438 flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
439 if (flags & BIT(ACTIVE))
440 flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
441 if (flags & BIT(ERROR))
442 flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
443 }
444
445 /* PG_reclaim is overloaded as PG_readahead in the read path */
446 if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
447 flags ^= BIT(RECLAIM) | BIT(READAHEAD);
448
449 if (pme & PM_SOFT_DIRTY)
450 flags |= BIT(SOFTDIRTY);
451
452 return flags;
453 }
454
455 static uint64_t well_known_flags(uint64_t flags)
456 {
457 /* hide flags intended only for kernel hacker */
458 flags &= ~KPF_HACKERS_BITS;
459
460 /* hide non-hugeTLB compound pages */
461 if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
462 flags &= ~BITS_COMPOUND;
463
464 return flags;
465 }
466
467 static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme)
468 {
469 if (opt_raw)
470 flags = expand_overloaded_flags(flags, pme);
471 else
472 flags = well_known_flags(flags);
473
474 return flags;
475 }
476
477 /*
478 * page actions
479 */
480
481 static void prepare_hwpoison_fd(void)
482 {
483 char buf[MAX_PATH + 1];
484
485 hwpoison_debug_fs = debugfs_mount(NULL);
486 if (!hwpoison_debug_fs) {
487 perror("mount debugfs");
488 exit(EXIT_FAILURE);
489 }
490
491 if (opt_hwpoison && !hwpoison_inject_fd) {
492 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
493 hwpoison_debug_fs);
494 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
495 }
496
497 if (opt_unpoison && !hwpoison_forget_fd) {
498 snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
499 hwpoison_debug_fs);
500 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
501 }
502 }
503
504 static int hwpoison_page(unsigned long offset)
505 {
506 char buf[100];
507 int len;
508
509 len = sprintf(buf, "0x%lx\n", offset);
510 len = write(hwpoison_inject_fd, buf, len);
511 if (len < 0) {
512 perror("hwpoison inject");
513 return len;
514 }
515 return 0;
516 }
517
518 static int unpoison_page(unsigned long offset)
519 {
520 char buf[100];
521 int len;
522
523 len = sprintf(buf, "0x%lx\n", offset);
524 len = write(hwpoison_forget_fd, buf, len);
525 if (len < 0) {
526 perror("hwpoison forget");
527 return len;
528 }
529 return 0;
530 }
531
532 /*
533 * page frame walker
534 */
535
536 static size_t hash_slot(uint64_t flags)
537 {
538 size_t k = HASH_KEY(flags);
539 size_t i;
540
541 /* Explicitly reserve slot 0 for flags 0: the following logic
542 * cannot distinguish an unoccupied slot from slot (flags==0).
543 */
544 if (flags == 0)
545 return 0;
546
547 /* search through the remaining (HASH_SIZE-1) slots */
548 for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
549 if (!k || k >= ARRAY_SIZE(page_flags))
550 k = 1;
551 if (page_flags[k] == 0) {
552 page_flags[k] = flags;
553 return k;
554 }
555 if (page_flags[k] == flags)
556 return k;
557 }
558
559 fatal("hash table full: bump up HASH_SHIFT?\n");
560 exit(EXIT_FAILURE);
561 }
562
563 static void add_page(unsigned long voffset,
564 unsigned long offset, uint64_t flags, uint64_t pme)
565 {
566 flags = kpageflags_flags(flags, pme);
567
568 if (!bit_mask_ok(flags))
569 return;
570
571 if (opt_hwpoison)
572 hwpoison_page(offset);
573 if (opt_unpoison)
574 unpoison_page(offset);
575
576 if (opt_list == 1)
577 show_page_range(voffset, offset, 1, flags);
578 else if (opt_list == 2)
579 show_page(voffset, offset, flags);
580
581 nr_pages[hash_slot(flags)]++;
582 total_pages++;
583 }
584
585 #define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
586 static void walk_pfn(unsigned long voffset,
587 unsigned long index,
588 unsigned long count,
589 uint64_t pme)
590 {
591 uint64_t buf[KPAGEFLAGS_BATCH];
592 unsigned long batch;
593 unsigned long pages;
594 unsigned long i;
595
596 while (count) {
597 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
598 pages = kpageflags_read(buf, index, batch);
599 if (pages == 0)
600 break;
601
602 for (i = 0; i < pages; i++)
603 add_page(voffset + i, index + i, buf[i], pme);
604
605 index += pages;
606 count -= pages;
607 }
608 }
609
610 #define PAGEMAP_BATCH (64 << 10)
611 static void walk_vma(unsigned long index, unsigned long count)
612 {
613 uint64_t buf[PAGEMAP_BATCH];
614 unsigned long batch;
615 unsigned long pages;
616 unsigned long pfn;
617 unsigned long i;
618
619 while (count) {
620 batch = min_t(unsigned long, count, PAGEMAP_BATCH);
621 pages = pagemap_read(buf, index, batch);
622 if (pages == 0)
623 break;
624
625 for (i = 0; i < pages; i++) {
626 pfn = pagemap_pfn(buf[i]);
627 if (pfn)
628 walk_pfn(index + i, pfn, 1, buf[i]);
629 }
630
631 index += pages;
632 count -= pages;
633 }
634 }
635
636 static void walk_task(unsigned long index, unsigned long count)
637 {
638 const unsigned long end = index + count;
639 unsigned long start;
640 int i = 0;
641
642 while (index < end) {
643
644 while (pg_end[i] <= index)
645 if (++i >= nr_vmas)
646 return;
647 if (pg_start[i] >= end)
648 return;
649
650 start = max_t(unsigned long, pg_start[i], index);
651 index = min_t(unsigned long, pg_end[i], end);
652
653 assert(start < index);
654 walk_vma(start, index - start);
655 }
656 }
657
658 static void add_addr_range(unsigned long offset, unsigned long size)
659 {
660 if (nr_addr_ranges >= MAX_ADDR_RANGES)
661 fatal("too many addr ranges\n");
662
663 opt_offset[nr_addr_ranges] = offset;
664 opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
665 nr_addr_ranges++;
666 }
667
668 static void walk_addr_ranges(void)
669 {
670 int i;
671
672 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
673
674 if (!nr_addr_ranges)
675 add_addr_range(0, ULONG_MAX);
676
677 for (i = 0; i < nr_addr_ranges; i++)
678 if (!opt_pid)
679 walk_pfn(opt_offset[i], opt_offset[i], opt_size[i], 0);
680 else
681 walk_task(opt_offset[i], opt_size[i]);
682
683 close(kpageflags_fd);
684 }
685
686
687 /*
688 * user interface
689 */
690
691 static const char *page_flag_type(uint64_t flag)
692 {
693 if (flag & KPF_HACKERS_BITS)
694 return "(r)";
695 if (flag & KPF_OVERLOADED_BITS)
696 return "(o)";
697 return " ";
698 }
699
700 static void usage(void)
701 {
702 size_t i, j;
703
704 printf(
705 "page-types [options]\n"
706 " -r|--raw Raw mode, for kernel developers\n"
707 " -d|--describe flags Describe flags\n"
708 " -a|--addr addr-spec Walk a range of pages\n"
709 " -b|--bits bits-spec Walk pages with specified bits\n"
710 " -p|--pid pid Walk process address space\n"
711 " -f|--file filename Walk file address space\n"
712 " -l|--list Show page details in ranges\n"
713 " -L|--list-each Show page details one by one\n"
714 " -N|--no-summary Don't show summary info\n"
715 " -X|--hwpoison hwpoison pages\n"
716 " -x|--unpoison unpoison pages\n"
717 " -h|--help Show this usage message\n"
718 "flags:\n"
719 " 0x10 bitfield format, e.g.\n"
720 " anon bit-name, e.g.\n"
721 " 0x10,anon comma-separated list, e.g.\n"
722 "addr-spec:\n"
723 " N one page at offset N (unit: pages)\n"
724 " N+M pages range from N to N+M-1\n"
725 " N,M pages range from N to M-1\n"
726 " N, pages range from N to end\n"
727 " ,M pages range from 0 to M-1\n"
728 "bits-spec:\n"
729 " bit1,bit2 (flags & (bit1|bit2)) != 0\n"
730 " bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
731 " bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
732 " =bit1,bit2 flags == (bit1|bit2)\n"
733 "bit-names:\n"
734 );
735
736 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
737 if (!page_flag_names[i])
738 continue;
739 printf("%16s%s", page_flag_names[i] + 2,
740 page_flag_type(1ULL << i));
741 if (++j > 3) {
742 j = 0;
743 putchar('\n');
744 }
745 }
746 printf("\n "
747 "(r) raw mode bits (o) overloaded bits\n");
748 }
749
750 static unsigned long long parse_number(const char *str)
751 {
752 unsigned long long n;
753
754 n = strtoll(str, NULL, 0);
755
756 if (n == 0 && str[0] != '0')
757 fatal("invalid name or number: %s\n", str);
758
759 return n;
760 }
761
762 static void parse_pid(const char *str)
763 {
764 FILE *file;
765 char buf[5000];
766
767 opt_pid = parse_number(str);
768
769 sprintf(buf, "/proc/%d/pagemap", opt_pid);
770 pagemap_fd = checked_open(buf, O_RDONLY);
771
772 sprintf(buf, "/proc/%d/maps", opt_pid);
773 file = fopen(buf, "r");
774 if (!file) {
775 perror(buf);
776 exit(EXIT_FAILURE);
777 }
778
779 while (fgets(buf, sizeof(buf), file) != NULL) {
780 unsigned long vm_start;
781 unsigned long vm_end;
782 unsigned long long pgoff;
783 int major, minor;
784 char r, w, x, s;
785 unsigned long ino;
786 int n;
787
788 n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
789 &vm_start,
790 &vm_end,
791 &r, &w, &x, &s,
792 &pgoff,
793 &major, &minor,
794 &ino);
795 if (n < 10) {
796 fprintf(stderr, "unexpected line: %s\n", buf);
797 continue;
798 }
799 pg_start[nr_vmas] = vm_start / page_size;
800 pg_end[nr_vmas] = vm_end / page_size;
801 if (++nr_vmas >= MAX_VMAS) {
802 fprintf(stderr, "too many VMAs\n");
803 break;
804 }
805 }
806 fclose(file);
807 }
808
809 static void show_file(const char *name, const struct stat *st)
810 {
811 unsigned long long size = st->st_size;
812 char atime[64], mtime[64];
813 long now = time(NULL);
814
815 printf("%s\tInode: %u\tSize: %llu (%llu pages)\n",
816 name, (unsigned)st->st_ino,
817 size, (size + page_size - 1) / page_size);
818
819 strftime(atime, sizeof(atime), "%c", localtime(&st->st_atime));
820 strftime(mtime, sizeof(mtime), "%c", localtime(&st->st_mtime));
821
822 printf("Modify: %s (%ld seconds ago)\nAccess: %s (%ld seconds ago)\n",
823 mtime, now - st->st_mtime,
824 atime, now - st->st_atime);
825 }
826
827 static void walk_file(const char *name, const struct stat *st)
828 {
829 uint8_t vec[PAGEMAP_BATCH];
830 uint64_t buf[PAGEMAP_BATCH], flags;
831 unsigned long nr_pages, pfn, i;
832 int fd;
833 off_t off;
834 ssize_t len;
835 void *ptr;
836 int first = 1;
837
838 fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
839
840 for (off = 0; off < st->st_size; off += len) {
841 nr_pages = (st->st_size - off + page_size - 1) / page_size;
842 if (nr_pages > PAGEMAP_BATCH)
843 nr_pages = PAGEMAP_BATCH;
844 len = nr_pages * page_size;
845
846 ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, off);
847 if (ptr == MAP_FAILED)
848 fatal("mmap failed: %s", name);
849
850 /* determine cached pages */
851 if (mincore(ptr, len, vec))
852 fatal("mincore failed: %s", name);
853
854 /* turn off readahead */
855 if (madvise(ptr, len, MADV_RANDOM))
856 fatal("madvice failed: %s", name);
857
858 /* populate ptes */
859 for (i = 0; i < nr_pages ; i++) {
860 if (vec[i] & 1)
861 (void)*(volatile int *)(ptr + i * page_size);
862 }
863
864 /* turn off harvesting reference bits */
865 if (madvise(ptr, len, MADV_SEQUENTIAL))
866 fatal("madvice failed: %s", name);
867
868 if (pagemap_read(buf, (unsigned long)ptr / page_size,
869 nr_pages) != nr_pages)
870 fatal("cannot read pagemap");
871
872 munmap(ptr, len);
873
874 for (i = 0; i < nr_pages; i++) {
875 pfn = pagemap_pfn(buf[i]);
876 if (!pfn)
877 continue;
878 if (!kpageflags_read(&flags, pfn, 1))
879 continue;
880 if (first && opt_list) {
881 first = 0;
882 flush_page_range();
883 show_file(name, st);
884 }
885 add_page(off / page_size + i, pfn, flags, buf[i]);
886 }
887 }
888
889 close(fd);
890 }
891
892 int walk_tree(const char *name, const struct stat *st, int type, struct FTW *f)
893 {
894 (void)f;
895 switch (type) {
896 case FTW_F:
897 if (S_ISREG(st->st_mode))
898 walk_file(name, st);
899 break;
900 case FTW_DNR:
901 fprintf(stderr, "cannot read dir: %s\n", name);
902 break;
903 }
904 return 0;
905 }
906
907 static void walk_page_cache(void)
908 {
909 struct stat st;
910
911 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
912 pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY);
913
914 if (stat(opt_file, &st))
915 fatal("stat failed: %s\n", opt_file);
916
917 if (S_ISREG(st.st_mode)) {
918 walk_file(opt_file, &st);
919 } else if (S_ISDIR(st.st_mode)) {
920 /* do not follow symlinks and mountpoints */
921 if (nftw(opt_file, walk_tree, 64, FTW_MOUNT | FTW_PHYS) < 0)
922 fatal("nftw failed: %s\n", opt_file);
923 } else
924 fatal("unhandled file type: %s\n", opt_file);
925
926 close(kpageflags_fd);
927 close(pagemap_fd);
928 }
929
930 static void parse_file(const char *name)
931 {
932 opt_file = name;
933 }
934
935 static void parse_addr_range(const char *optarg)
936 {
937 unsigned long offset;
938 unsigned long size;
939 char *p;
940
941 p = strchr(optarg, ',');
942 if (!p)
943 p = strchr(optarg, '+');
944
945 if (p == optarg) {
946 offset = 0;
947 size = parse_number(p + 1);
948 } else if (p) {
949 offset = parse_number(optarg);
950 if (p[1] == '\0')
951 size = ULONG_MAX;
952 else {
953 size = parse_number(p + 1);
954 if (*p == ',') {
955 if (size < offset)
956 fatal("invalid range: %lu,%lu\n",
957 offset, size);
958 size -= offset;
959 }
960 }
961 } else {
962 offset = parse_number(optarg);
963 size = 1;
964 }
965
966 add_addr_range(offset, size);
967 }
968
969 static void add_bits_filter(uint64_t mask, uint64_t bits)
970 {
971 if (nr_bit_filters >= MAX_BIT_FILTERS)
972 fatal("too much bit filters\n");
973
974 opt_mask[nr_bit_filters] = mask;
975 opt_bits[nr_bit_filters] = bits;
976 nr_bit_filters++;
977 }
978
979 static uint64_t parse_flag_name(const char *str, int len)
980 {
981 size_t i;
982
983 if (!*str || !len)
984 return 0;
985
986 if (len <= 8 && !strncmp(str, "compound", len))
987 return BITS_COMPOUND;
988
989 for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
990 if (!page_flag_names[i])
991 continue;
992 if (!strncmp(str, page_flag_names[i] + 2, len))
993 return 1ULL << i;
994 }
995
996 return parse_number(str);
997 }
998
999 static uint64_t parse_flag_names(const char *str, int all)
1000 {
1001 const char *p = str;
1002 uint64_t flags = 0;
1003
1004 while (1) {
1005 if (*p == ',' || *p == '=' || *p == '\0') {
1006 if ((*str != '~') || (*str == '~' && all && *++str))
1007 flags |= parse_flag_name(str, p - str);
1008 if (*p != ',')
1009 break;
1010 str = p + 1;
1011 }
1012 p++;
1013 }
1014
1015 return flags;
1016 }
1017
1018 static void parse_bits_mask(const char *optarg)
1019 {
1020 uint64_t mask;
1021 uint64_t bits;
1022 const char *p;
1023
1024 p = strchr(optarg, '=');
1025 if (p == optarg) {
1026 mask = KPF_ALL_BITS;
1027 bits = parse_flag_names(p + 1, 0);
1028 } else if (p) {
1029 mask = parse_flag_names(optarg, 0);
1030 bits = parse_flag_names(p + 1, 0);
1031 } else if (strchr(optarg, '~')) {
1032 mask = parse_flag_names(optarg, 1);
1033 bits = parse_flag_names(optarg, 0);
1034 } else {
1035 mask = parse_flag_names(optarg, 0);
1036 bits = KPF_ALL_BITS;
1037 }
1038
1039 add_bits_filter(mask, bits);
1040 }
1041
1042 static void describe_flags(const char *optarg)
1043 {
1044 uint64_t flags = parse_flag_names(optarg, 0);
1045
1046 printf("0x%016llx\t%s\t%s\n",
1047 (unsigned long long)flags,
1048 page_flag_name(flags),
1049 page_flag_longname(flags));
1050 }
1051
1052 static const struct option opts[] = {
1053 { "raw" , 0, NULL, 'r' },
1054 { "pid" , 1, NULL, 'p' },
1055 { "file" , 1, NULL, 'f' },
1056 { "addr" , 1, NULL, 'a' },
1057 { "bits" , 1, NULL, 'b' },
1058 { "describe" , 1, NULL, 'd' },
1059 { "list" , 0, NULL, 'l' },
1060 { "list-each" , 0, NULL, 'L' },
1061 { "no-summary", 0, NULL, 'N' },
1062 { "hwpoison" , 0, NULL, 'X' },
1063 { "unpoison" , 0, NULL, 'x' },
1064 { "help" , 0, NULL, 'h' },
1065 { NULL , 0, NULL, 0 }
1066 };
1067
1068 int main(int argc, char *argv[])
1069 {
1070 int c;
1071
1072 page_size = getpagesize();
1073
1074 while ((c = getopt_long(argc, argv,
1075 "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
1076 switch (c) {
1077 case 'r':
1078 opt_raw = 1;
1079 break;
1080 case 'p':
1081 parse_pid(optarg);
1082 break;
1083 case 'f':
1084 parse_file(optarg);
1085 break;
1086 case 'a':
1087 parse_addr_range(optarg);
1088 break;
1089 case 'b':
1090 parse_bits_mask(optarg);
1091 break;
1092 case 'd':
1093 describe_flags(optarg);
1094 exit(0);
1095 case 'l':
1096 opt_list = 1;
1097 break;
1098 case 'L':
1099 opt_list = 2;
1100 break;
1101 case 'N':
1102 opt_no_summary = 1;
1103 break;
1104 case 'X':
1105 opt_hwpoison = 1;
1106 prepare_hwpoison_fd();
1107 break;
1108 case 'x':
1109 opt_unpoison = 1;
1110 prepare_hwpoison_fd();
1111 break;
1112 case 'h':
1113 usage();
1114 exit(0);
1115 default:
1116 usage();
1117 exit(1);
1118 }
1119 }
1120
1121 if (opt_list && opt_pid)
1122 printf("voffset\t");
1123 if (opt_list && opt_file)
1124 printf("foffset\t");
1125 if (opt_list == 1)
1126 printf("offset\tlen\tflags\n");
1127 if (opt_list == 2)
1128 printf("offset\tflags\n");
1129
1130 if (opt_file)
1131 walk_page_cache();
1132 else
1133 walk_addr_ranges();
1134
1135 if (opt_list == 1)
1136 flush_page_range();
1137
1138 if (opt_no_summary)
1139 return 0;
1140
1141 if (opt_list)
1142 printf("\n\n");
1143
1144 show_summary();
1145
1146 return 0;
1147 }
Linux with added FPC-III support