Root/
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 <setjmp.h> |
36 | #include <signal.h> |
37 | #include <sys/types.h> |
38 | #include <sys/errno.h> |
39 | #include <sys/fcntl.h> |
40 | #include <sys/mount.h> |
41 | #include <sys/statfs.h> |
42 | #include <sys/mman.h> |
43 | #include "../../include/uapi/linux/magic.h" |
44 | #include "../../include/uapi/linux/kernel-page-flags.h" |
45 | #include <api/fs/debugfs.h> |
46 | |
47 | #ifndef MAX_PATH |
48 | # define MAX_PATH 256 |
49 | #endif |
50 | |
51 | #ifndef STR |
52 | # define _STR(x) #x |
53 | # define STR(x) _STR(x) |
54 | #endif |
55 | |
56 | /* |
57 | * pagemap kernel ABI bits |
58 | */ |
59 | |
60 | #define PM_ENTRY_BYTES sizeof(uint64_t) |
61 | #define PM_STATUS_BITS 3 |
62 | #define PM_STATUS_OFFSET (64 - PM_STATUS_BITS) |
63 | #define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET) |
64 | #define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK) |
65 | #define PM_PSHIFT_BITS 6 |
66 | #define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS) |
67 | #define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET) |
68 | #define __PM_PSHIFT(x) (((uint64_t) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK) |
69 | #define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1) |
70 | #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) |
71 | |
72 | #define __PM_SOFT_DIRTY (1LL) |
73 | #define PM_PRESENT PM_STATUS(4LL) |
74 | #define PM_SWAP PM_STATUS(2LL) |
75 | #define PM_SOFT_DIRTY __PM_PSHIFT(__PM_SOFT_DIRTY) |
76 | |
77 | |
78 | /* |
79 | * kernel page flags |
80 | */ |
81 | |
82 | #define KPF_BYTES 8 |
83 | #define PROC_KPAGEFLAGS "/proc/kpageflags" |
84 | |
85 | /* [32-] kernel hacking assistances */ |
86 | #define KPF_RESERVED 32 |
87 | #define KPF_MLOCKED 33 |
88 | #define KPF_MAPPEDTODISK 34 |
89 | #define KPF_PRIVATE 35 |
90 | #define KPF_PRIVATE_2 36 |
91 | #define KPF_OWNER_PRIVATE 37 |
92 | #define KPF_ARCH 38 |
93 | #define KPF_UNCACHED 39 |
94 | #define KPF_SOFTDIRTY 40 |
95 | |
96 | /* [48-] take some arbitrary free slots for expanding overloaded flags |
97 | * not part of kernel API |
98 | */ |
99 | #define KPF_READAHEAD 48 |
100 | #define KPF_SLOB_FREE 49 |
101 | #define KPF_SLUB_FROZEN 50 |
102 | #define KPF_SLUB_DEBUG 51 |
103 | |
104 | #define KPF_ALL_BITS ((uint64_t)~0ULL) |
105 | #define KPF_HACKERS_BITS (0xffffULL << 32) |
106 | #define KPF_OVERLOADED_BITS (0xffffULL << 48) |
107 | #define BIT(name) (1ULL << KPF_##name) |
108 | #define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL)) |
109 | |
110 | static const char * const page_flag_names[] = { |
111 | [KPF_LOCKED] = "L:locked", |
112 | [KPF_ERROR] = "E:error", |
113 | [KPF_REFERENCED] = "R:referenced", |
114 | [KPF_UPTODATE] = "U:uptodate", |
115 | [KPF_DIRTY] = "D:dirty", |
116 | [KPF_LRU] = "l:lru", |
117 | [KPF_ACTIVE] = "A:active", |
118 | [KPF_SLAB] = "S:slab", |
119 | [KPF_WRITEBACK] = "W:writeback", |
120 | [KPF_RECLAIM] = "I:reclaim", |
121 | [KPF_BUDDY] = "B:buddy", |
122 | |
123 | [KPF_MMAP] = "M:mmap", |
124 | [KPF_ANON] = "a:anonymous", |
125 | [KPF_SWAPCACHE] = "s:swapcache", |
126 | [KPF_SWAPBACKED] = "b:swapbacked", |
127 | [KPF_COMPOUND_HEAD] = "H:compound_head", |
128 | [KPF_COMPOUND_TAIL] = "T:compound_tail", |
129 | [KPF_HUGE] = "G:huge", |
130 | [KPF_UNEVICTABLE] = "u:unevictable", |
131 | [KPF_HWPOISON] = "X:hwpoison", |
132 | [KPF_NOPAGE] = "n:nopage", |
133 | [KPF_KSM] = "x:ksm", |
134 | [KPF_THP] = "t:thp", |
135 | |
136 | [KPF_RESERVED] = "r:reserved", |
137 | [KPF_MLOCKED] = "m:mlocked", |
138 | [KPF_MAPPEDTODISK] = "d:mappedtodisk", |
139 | [KPF_PRIVATE] = "P:private", |
140 | [KPF_PRIVATE_2] = "p:private_2", |
141 | [KPF_OWNER_PRIVATE] = "O:owner_private", |
142 | [KPF_ARCH] = "h:arch", |
143 | [KPF_UNCACHED] = "c:uncached", |
144 | [KPF_SOFTDIRTY] = "f:softdirty", |
145 | |
146 | [KPF_READAHEAD] = "I:readahead", |
147 | [KPF_SLOB_FREE] = "P:slob_free", |
148 | [KPF_SLUB_FROZEN] = "A:slub_frozen", |
149 | [KPF_SLUB_DEBUG] = "E:slub_debug", |
150 | }; |
151 | |
152 | |
153 | static const char * const debugfs_known_mountpoints[] = { |
154 | "/sys/kernel/debug", |
155 | "/debug", |
156 | 0, |
157 | }; |
158 | |
159 | /* |
160 | * data structures |
161 | */ |
162 | |
163 | static int opt_raw; /* for kernel developers */ |
164 | static int opt_list; /* list pages (in ranges) */ |
165 | static int opt_no_summary; /* don't show summary */ |
166 | static pid_t opt_pid; /* process to walk */ |
167 | const char * opt_file; |
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 | |
189 | static int opt_hwpoison; |
190 | static int opt_unpoison; |
191 | |
192 | static char *hwpoison_debug_fs; |
193 | static int hwpoison_inject_fd; |
194 | static int hwpoison_forget_fd; |
195 | |
196 | #define HASH_SHIFT 13 |
197 | #define HASH_SIZE (1 << HASH_SHIFT) |
198 | #define HASH_MASK (HASH_SIZE - 1) |
199 | #define HASH_KEY(flags) (flags & HASH_MASK) |
200 | |
201 | static unsigned long total_pages; |
202 | static unsigned long nr_pages[HASH_SIZE]; |
203 | static uint64_t page_flags[HASH_SIZE]; |
204 | |
205 | |
206 | /* |
207 | * helper functions |
208 | */ |
209 | |
210 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
211 | |
212 | #define min_t(type, x, y) ({ \ |
213 | type __min1 = (x); \ |
214 | type __min2 = (y); \ |
215 | __min1 < __min2 ? __min1 : __min2; }) |
216 | |
217 | #define max_t(type, x, y) ({ \ |
218 | type __max1 = (x); \ |
219 | type __max2 = (y); \ |
220 | __max1 > __max2 ? __max1 : __max2; }) |
221 | |
222 | static unsigned long pages2mb(unsigned long pages) |
223 | { |
224 | return (pages * page_size) >> 20; |
225 | } |
226 | |
227 | static void fatal(const char *x, ...) |
228 | { |
229 | va_list ap; |
230 | |
231 | va_start(ap, x); |
232 | vfprintf(stderr, x, ap); |
233 | va_end(ap); |
234 | exit(EXIT_FAILURE); |
235 | } |
236 | |
237 | static int checked_open(const char *pathname, int flags) |
238 | { |
239 | int fd = open(pathname, flags); |
240 | |
241 | if (fd < 0) { |
242 | perror(pathname); |
243 | exit(EXIT_FAILURE); |
244 | } |
245 | |
246 | return fd; |
247 | } |
248 | |
249 | /* |
250 | * pagemap/kpageflags routines |
251 | */ |
252 | |
253 | static unsigned long do_u64_read(int fd, char *name, |
254 | uint64_t *buf, |
255 | unsigned long index, |
256 | unsigned long count) |
257 | { |
258 | long bytes; |
259 | |
260 | if (index > ULONG_MAX / 8) |
261 | fatal("index overflow: %lu\n", index); |
262 | |
263 | bytes = pread(fd, buf, count * 8, (off_t)index * 8); |
264 | if (bytes < 0) { |
265 | perror(name); |
266 | exit(EXIT_FAILURE); |
267 | } |
268 | if (bytes % 8) |
269 | fatal("partial read: %lu bytes\n", bytes); |
270 | |
271 | return bytes / 8; |
272 | } |
273 | |
274 | static unsigned long kpageflags_read(uint64_t *buf, |
275 | unsigned long index, |
276 | unsigned long pages) |
277 | { |
278 | return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages); |
279 | } |
280 | |
281 | static unsigned long pagemap_read(uint64_t *buf, |
282 | unsigned long index, |
283 | unsigned long pages) |
284 | { |
285 | return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages); |
286 | } |
287 | |
288 | static unsigned long pagemap_pfn(uint64_t val) |
289 | { |
290 | unsigned long pfn; |
291 | |
292 | if (val & PM_PRESENT) |
293 | pfn = PM_PFRAME(val); |
294 | else |
295 | pfn = 0; |
296 | |
297 | return pfn; |
298 | } |
299 | |
300 | |
301 | /* |
302 | * page flag names |
303 | */ |
304 | |
305 | static char *page_flag_name(uint64_t flags) |
306 | { |
307 | static char buf[65]; |
308 | int present; |
309 | size_t i, j; |
310 | |
311 | for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
312 | present = (flags >> i) & 1; |
313 | if (!page_flag_names[i]) { |
314 | if (present) |
315 | fatal("unknown flag bit %d\n", i); |
316 | continue; |
317 | } |
318 | buf[j++] = present ? page_flag_names[i][0] : '_'; |
319 | } |
320 | |
321 | return buf; |
322 | } |
323 | |
324 | static char *page_flag_longname(uint64_t flags) |
325 | { |
326 | static char buf[1024]; |
327 | size_t i, n; |
328 | |
329 | for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
330 | if (!page_flag_names[i]) |
331 | continue; |
332 | if ((flags >> i) & 1) |
333 | n += snprintf(buf + n, sizeof(buf) - n, "%s,", |
334 | page_flag_names[i] + 2); |
335 | } |
336 | if (n) |
337 | n--; |
338 | buf[n] = '\0'; |
339 | |
340 | return buf; |
341 | } |
342 | |
343 | |
344 | /* |
345 | * page list and summary |
346 | */ |
347 | |
348 | static void show_page_range(unsigned long voffset, unsigned long offset, |
349 | unsigned long size, uint64_t flags) |
350 | { |
351 | static uint64_t flags0; |
352 | static unsigned long voff; |
353 | static unsigned long index; |
354 | static unsigned long count; |
355 | |
356 | if (flags == flags0 && offset == index + count && |
357 | size && voffset == voff + count) { |
358 | count += size; |
359 | return; |
360 | } |
361 | |
362 | if (count) { |
363 | if (opt_pid) |
364 | printf("%lx\t", voff); |
365 | if (opt_file) |
366 | printf("%lu\t", voff); |
367 | printf("%lx\t%lx\t%s\n", |
368 | index, count, page_flag_name(flags0)); |
369 | } |
370 | |
371 | flags0 = flags; |
372 | index = offset; |
373 | voff = voffset; |
374 | count = size; |
375 | } |
376 | |
377 | static void flush_page_range(void) |
378 | { |
379 | show_page_range(0, 0, 0, 0); |
380 | } |
381 | |
382 | static void show_page(unsigned long voffset, |
383 | unsigned long offset, uint64_t flags) |
384 | { |
385 | if (opt_pid) |
386 | printf("%lx\t", voffset); |
387 | if (opt_file) |
388 | printf("%lu\t", voffset); |
389 | printf("%lx\t%s\n", offset, page_flag_name(flags)); |
390 | } |
391 | |
392 | static void show_summary(void) |
393 | { |
394 | size_t i; |
395 | |
396 | printf(" flags\tpage-count MB" |
397 | " symbolic-flags\t\t\tlong-symbolic-flags\n"); |
398 | |
399 | for (i = 0; i < ARRAY_SIZE(nr_pages); i++) { |
400 | if (nr_pages[i]) |
401 | printf("0x%016llx\t%10lu %8lu %s\t%s\n", |
402 | (unsigned long long)page_flags[i], |
403 | nr_pages[i], |
404 | pages2mb(nr_pages[i]), |
405 | page_flag_name(page_flags[i]), |
406 | page_flag_longname(page_flags[i])); |
407 | } |
408 | |
409 | printf(" total\t%10lu %8lu\n", |
410 | total_pages, pages2mb(total_pages)); |
411 | } |
412 | |
413 | |
414 | /* |
415 | * page flag filters |
416 | */ |
417 | |
418 | static int bit_mask_ok(uint64_t flags) |
419 | { |
420 | int i; |
421 | |
422 | for (i = 0; i < nr_bit_filters; i++) { |
423 | if (opt_bits[i] == KPF_ALL_BITS) { |
424 | if ((flags & opt_mask[i]) == 0) |
425 | return 0; |
426 | } else { |
427 | if ((flags & opt_mask[i]) != opt_bits[i]) |
428 | return 0; |
429 | } |
430 | } |
431 | |
432 | return 1; |
433 | } |
434 | |
435 | static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme) |
436 | { |
437 | /* SLOB/SLUB overload several page flags */ |
438 | if (flags & BIT(SLAB)) { |
439 | if (flags & BIT(PRIVATE)) |
440 | flags ^= BIT(PRIVATE) | BIT(SLOB_FREE); |
441 | if (flags & BIT(ACTIVE)) |
442 | flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN); |
443 | if (flags & BIT(ERROR)) |
444 | flags ^= BIT(ERROR) | BIT(SLUB_DEBUG); |
445 | } |
446 | |
447 | /* PG_reclaim is overloaded as PG_readahead in the read path */ |
448 | if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM)) |
449 | flags ^= BIT(RECLAIM) | BIT(READAHEAD); |
450 | |
451 | if (pme & PM_SOFT_DIRTY) |
452 | flags |= BIT(SOFTDIRTY); |
453 | |
454 | return flags; |
455 | } |
456 | |
457 | static uint64_t well_known_flags(uint64_t flags) |
458 | { |
459 | /* hide flags intended only for kernel hacker */ |
460 | flags &= ~KPF_HACKERS_BITS; |
461 | |
462 | /* hide non-hugeTLB compound pages */ |
463 | if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE))) |
464 | flags &= ~BITS_COMPOUND; |
465 | |
466 | return flags; |
467 | } |
468 | |
469 | static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme) |
470 | { |
471 | if (opt_raw) |
472 | flags = expand_overloaded_flags(flags, pme); |
473 | else |
474 | flags = well_known_flags(flags); |
475 | |
476 | return flags; |
477 | } |
478 | |
479 | /* |
480 | * page actions |
481 | */ |
482 | |
483 | static void prepare_hwpoison_fd(void) |
484 | { |
485 | char buf[MAX_PATH + 1]; |
486 | |
487 | hwpoison_debug_fs = debugfs_mount(NULL); |
488 | if (!hwpoison_debug_fs) { |
489 | perror("mount debugfs"); |
490 | exit(EXIT_FAILURE); |
491 | } |
492 | |
493 | if (opt_hwpoison && !hwpoison_inject_fd) { |
494 | snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn", |
495 | hwpoison_debug_fs); |
496 | hwpoison_inject_fd = checked_open(buf, O_WRONLY); |
497 | } |
498 | |
499 | if (opt_unpoison && !hwpoison_forget_fd) { |
500 | snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn", |
501 | hwpoison_debug_fs); |
502 | hwpoison_forget_fd = checked_open(buf, O_WRONLY); |
503 | } |
504 | } |
505 | |
506 | static int hwpoison_page(unsigned long offset) |
507 | { |
508 | char buf[100]; |
509 | int len; |
510 | |
511 | len = sprintf(buf, "0x%lx\n", offset); |
512 | len = write(hwpoison_inject_fd, buf, len); |
513 | if (len < 0) { |
514 | perror("hwpoison inject"); |
515 | return len; |
516 | } |
517 | return 0; |
518 | } |
519 | |
520 | static int unpoison_page(unsigned long offset) |
521 | { |
522 | char buf[100]; |
523 | int len; |
524 | |
525 | len = sprintf(buf, "0x%lx\n", offset); |
526 | len = write(hwpoison_forget_fd, buf, len); |
527 | if (len < 0) { |
528 | perror("hwpoison forget"); |
529 | return len; |
530 | } |
531 | return 0; |
532 | } |
533 | |
534 | /* |
535 | * page frame walker |
536 | */ |
537 | |
538 | static size_t hash_slot(uint64_t flags) |
539 | { |
540 | size_t k = HASH_KEY(flags); |
541 | size_t i; |
542 | |
543 | /* Explicitly reserve slot 0 for flags 0: the following logic |
544 | * cannot distinguish an unoccupied slot from slot (flags==0). |
545 | */ |
546 | if (flags == 0) |
547 | return 0; |
548 | |
549 | /* search through the remaining (HASH_SIZE-1) slots */ |
550 | for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) { |
551 | if (!k || k >= ARRAY_SIZE(page_flags)) |
552 | k = 1; |
553 | if (page_flags[k] == 0) { |
554 | page_flags[k] = flags; |
555 | return k; |
556 | } |
557 | if (page_flags[k] == flags) |
558 | return k; |
559 | } |
560 | |
561 | fatal("hash table full: bump up HASH_SHIFT?\n"); |
562 | exit(EXIT_FAILURE); |
563 | } |
564 | |
565 | static void add_page(unsigned long voffset, |
566 | unsigned long offset, uint64_t flags, uint64_t pme) |
567 | { |
568 | flags = kpageflags_flags(flags, pme); |
569 | |
570 | if (!bit_mask_ok(flags)) |
571 | return; |
572 | |
573 | if (opt_hwpoison) |
574 | hwpoison_page(offset); |
575 | if (opt_unpoison) |
576 | unpoison_page(offset); |
577 | |
578 | if (opt_list == 1) |
579 | show_page_range(voffset, offset, 1, flags); |
580 | else if (opt_list == 2) |
581 | show_page(voffset, offset, flags); |
582 | |
583 | nr_pages[hash_slot(flags)]++; |
584 | total_pages++; |
585 | } |
586 | |
587 | #define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */ |
588 | static void walk_pfn(unsigned long voffset, |
589 | unsigned long index, |
590 | unsigned long count, |
591 | uint64_t pme) |
592 | { |
593 | uint64_t buf[KPAGEFLAGS_BATCH]; |
594 | unsigned long batch; |
595 | unsigned long pages; |
596 | unsigned long i; |
597 | |
598 | while (count) { |
599 | batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH); |
600 | pages = kpageflags_read(buf, index, batch); |
601 | if (pages == 0) |
602 | break; |
603 | |
604 | for (i = 0; i < pages; i++) |
605 | add_page(voffset + i, index + i, buf[i], pme); |
606 | |
607 | index += pages; |
608 | count -= pages; |
609 | } |
610 | } |
611 | |
612 | #define PAGEMAP_BATCH (64 << 10) |
613 | static void walk_vma(unsigned long index, unsigned long count) |
614 | { |
615 | uint64_t buf[PAGEMAP_BATCH]; |
616 | unsigned long batch; |
617 | unsigned long pages; |
618 | unsigned long pfn; |
619 | unsigned long i; |
620 | |
621 | while (count) { |
622 | batch = min_t(unsigned long, count, PAGEMAP_BATCH); |
623 | pages = pagemap_read(buf, index, batch); |
624 | if (pages == 0) |
625 | break; |
626 | |
627 | for (i = 0; i < pages; i++) { |
628 | pfn = pagemap_pfn(buf[i]); |
629 | if (pfn) |
630 | walk_pfn(index + i, pfn, 1, buf[i]); |
631 | } |
632 | |
633 | index += pages; |
634 | count -= pages; |
635 | } |
636 | } |
637 | |
638 | static void walk_task(unsigned long index, unsigned long count) |
639 | { |
640 | const unsigned long end = index + count; |
641 | unsigned long start; |
642 | int i = 0; |
643 | |
644 | while (index < end) { |
645 | |
646 | while (pg_end[i] <= index) |
647 | if (++i >= nr_vmas) |
648 | return; |
649 | if (pg_start[i] >= end) |
650 | return; |
651 | |
652 | start = max_t(unsigned long, pg_start[i], index); |
653 | index = min_t(unsigned long, pg_end[i], end); |
654 | |
655 | assert(start < index); |
656 | walk_vma(start, index - start); |
657 | } |
658 | } |
659 | |
660 | static void add_addr_range(unsigned long offset, unsigned long size) |
661 | { |
662 | if (nr_addr_ranges >= MAX_ADDR_RANGES) |
663 | fatal("too many addr ranges\n"); |
664 | |
665 | opt_offset[nr_addr_ranges] = offset; |
666 | opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset); |
667 | nr_addr_ranges++; |
668 | } |
669 | |
670 | static void walk_addr_ranges(void) |
671 | { |
672 | int i; |
673 | |
674 | kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY); |
675 | |
676 | if (!nr_addr_ranges) |
677 | add_addr_range(0, ULONG_MAX); |
678 | |
679 | for (i = 0; i < nr_addr_ranges; i++) |
680 | if (!opt_pid) |
681 | walk_pfn(opt_offset[i], opt_offset[i], opt_size[i], 0); |
682 | else |
683 | walk_task(opt_offset[i], opt_size[i]); |
684 | |
685 | close(kpageflags_fd); |
686 | } |
687 | |
688 | |
689 | /* |
690 | * user interface |
691 | */ |
692 | |
693 | static const char *page_flag_type(uint64_t flag) |
694 | { |
695 | if (flag & KPF_HACKERS_BITS) |
696 | return "(r)"; |
697 | if (flag & KPF_OVERLOADED_BITS) |
698 | return "(o)"; |
699 | return " "; |
700 | } |
701 | |
702 | static void usage(void) |
703 | { |
704 | size_t i, j; |
705 | |
706 | printf( |
707 | "page-types [options]\n" |
708 | " -r|--raw Raw mode, for kernel developers\n" |
709 | " -d|--describe flags Describe flags\n" |
710 | " -a|--addr addr-spec Walk a range of pages\n" |
711 | " -b|--bits bits-spec Walk pages with specified bits\n" |
712 | " -p|--pid pid Walk process address space\n" |
713 | " -f|--file filename Walk file address space\n" |
714 | " -l|--list Show page details in ranges\n" |
715 | " -L|--list-each Show page details one by one\n" |
716 | " -N|--no-summary Don't show summary info\n" |
717 | " -X|--hwpoison hwpoison pages\n" |
718 | " -x|--unpoison unpoison pages\n" |
719 | " -h|--help Show this usage message\n" |
720 | "flags:\n" |
721 | " 0x10 bitfield format, e.g.\n" |
722 | " anon bit-name, e.g.\n" |
723 | " 0x10,anon comma-separated list, e.g.\n" |
724 | "addr-spec:\n" |
725 | " N one page at offset N (unit: pages)\n" |
726 | " N+M pages range from N to N+M-1\n" |
727 | " N,M pages range from N to M-1\n" |
728 | " N, pages range from N to end\n" |
729 | " ,M pages range from 0 to M-1\n" |
730 | "bits-spec:\n" |
731 | " bit1,bit2 (flags & (bit1|bit2)) != 0\n" |
732 | " bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n" |
733 | " bit1,~bit2 (flags & (bit1|bit2)) == bit1\n" |
734 | " =bit1,bit2 flags == (bit1|bit2)\n" |
735 | "bit-names:\n" |
736 | ); |
737 | |
738 | for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
739 | if (!page_flag_names[i]) |
740 | continue; |
741 | printf("%16s%s", page_flag_names[i] + 2, |
742 | page_flag_type(1ULL << i)); |
743 | if (++j > 3) { |
744 | j = 0; |
745 | putchar('\n'); |
746 | } |
747 | } |
748 | printf("\n " |
749 | "(r) raw mode bits (o) overloaded bits\n"); |
750 | } |
751 | |
752 | static unsigned long long parse_number(const char *str) |
753 | { |
754 | unsigned long long n; |
755 | |
756 | n = strtoll(str, NULL, 0); |
757 | |
758 | if (n == 0 && str[0] != '0') |
759 | fatal("invalid name or number: %s\n", str); |
760 | |
761 | return n; |
762 | } |
763 | |
764 | static void parse_pid(const char *str) |
765 | { |
766 | FILE *file; |
767 | char buf[5000]; |
768 | |
769 | opt_pid = parse_number(str); |
770 | |
771 | sprintf(buf, "/proc/%d/pagemap", opt_pid); |
772 | pagemap_fd = checked_open(buf, O_RDONLY); |
773 | |
774 | sprintf(buf, "/proc/%d/maps", opt_pid); |
775 | file = fopen(buf, "r"); |
776 | if (!file) { |
777 | perror(buf); |
778 | exit(EXIT_FAILURE); |
779 | } |
780 | |
781 | while (fgets(buf, sizeof(buf), file) != NULL) { |
782 | unsigned long vm_start; |
783 | unsigned long vm_end; |
784 | unsigned long long pgoff; |
785 | int major, minor; |
786 | char r, w, x, s; |
787 | unsigned long ino; |
788 | int n; |
789 | |
790 | n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu", |
791 | &vm_start, |
792 | &vm_end, |
793 | &r, &w, &x, &s, |
794 | &pgoff, |
795 | &major, &minor, |
796 | &ino); |
797 | if (n < 10) { |
798 | fprintf(stderr, "unexpected line: %s\n", buf); |
799 | continue; |
800 | } |
801 | pg_start[nr_vmas] = vm_start / page_size; |
802 | pg_end[nr_vmas] = vm_end / page_size; |
803 | if (++nr_vmas >= MAX_VMAS) { |
804 | fprintf(stderr, "too many VMAs\n"); |
805 | break; |
806 | } |
807 | } |
808 | fclose(file); |
809 | } |
810 | |
811 | static void show_file(const char *name, const struct stat *st) |
812 | { |
813 | unsigned long long size = st->st_size; |
814 | char atime[64], mtime[64]; |
815 | long now = time(NULL); |
816 | |
817 | printf("%s\tInode: %u\tSize: %llu (%llu pages)\n", |
818 | name, (unsigned)st->st_ino, |
819 | size, (size + page_size - 1) / page_size); |
820 | |
821 | strftime(atime, sizeof(atime), "%c", localtime(&st->st_atime)); |
822 | strftime(mtime, sizeof(mtime), "%c", localtime(&st->st_mtime)); |
823 | |
824 | printf("Modify: %s (%ld seconds ago)\nAccess: %s (%ld seconds ago)\n", |
825 | mtime, now - st->st_mtime, |
826 | atime, now - st->st_atime); |
827 | } |
828 | |
829 | static sigjmp_buf sigbus_jmp; |
830 | |
831 | static void * volatile sigbus_addr; |
832 | |
833 | static void sigbus_handler(int sig, siginfo_t *info, void *ucontex) |
834 | { |
835 | (void)sig; |
836 | (void)ucontex; |
837 | sigbus_addr = info ? info->si_addr : NULL; |
838 | siglongjmp(sigbus_jmp, 1); |
839 | } |
840 | |
841 | static struct sigaction sigbus_action = { |
842 | .sa_sigaction = sigbus_handler, |
843 | .sa_flags = SA_SIGINFO, |
844 | }; |
845 | |
846 | static void walk_file(const char *name, const struct stat *st) |
847 | { |
848 | uint8_t vec[PAGEMAP_BATCH]; |
849 | uint64_t buf[PAGEMAP_BATCH], flags; |
850 | unsigned long nr_pages, pfn, i; |
851 | off_t off, end = st->st_size; |
852 | int fd; |
853 | ssize_t len; |
854 | void *ptr; |
855 | int first = 1; |
856 | |
857 | fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW); |
858 | |
859 | for (off = 0; off < end; off += len) { |
860 | nr_pages = (end - off + page_size - 1) / page_size; |
861 | if (nr_pages > PAGEMAP_BATCH) |
862 | nr_pages = PAGEMAP_BATCH; |
863 | len = nr_pages * page_size; |
864 | |
865 | ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, off); |
866 | if (ptr == MAP_FAILED) |
867 | fatal("mmap failed: %s", name); |
868 | |
869 | /* determine cached pages */ |
870 | if (mincore(ptr, len, vec)) |
871 | fatal("mincore failed: %s", name); |
872 | |
873 | /* turn off readahead */ |
874 | if (madvise(ptr, len, MADV_RANDOM)) |
875 | fatal("madvice failed: %s", name); |
876 | |
877 | if (sigsetjmp(sigbus_jmp, 1)) { |
878 | end = off + sigbus_addr ? sigbus_addr - ptr : 0; |
879 | fprintf(stderr, "got sigbus at offset %lld: %s\n", |
880 | (long long)end, name); |
881 | goto got_sigbus; |
882 | } |
883 | |
884 | /* populate ptes */ |
885 | for (i = 0; i < nr_pages ; i++) { |
886 | if (vec[i] & 1) |
887 | (void)*(volatile int *)(ptr + i * page_size); |
888 | } |
889 | got_sigbus: |
890 | |
891 | /* turn off harvesting reference bits */ |
892 | if (madvise(ptr, len, MADV_SEQUENTIAL)) |
893 | fatal("madvice failed: %s", name); |
894 | |
895 | if (pagemap_read(buf, (unsigned long)ptr / page_size, |
896 | nr_pages) != nr_pages) |
897 | fatal("cannot read pagemap"); |
898 | |
899 | munmap(ptr, len); |
900 | |
901 | for (i = 0; i < nr_pages; i++) { |
902 | pfn = pagemap_pfn(buf[i]); |
903 | if (!pfn) |
904 | continue; |
905 | if (!kpageflags_read(&flags, pfn, 1)) |
906 | continue; |
907 | if (first && opt_list) { |
908 | first = 0; |
909 | flush_page_range(); |
910 | show_file(name, st); |
911 | } |
912 | add_page(off / page_size + i, pfn, flags, buf[i]); |
913 | } |
914 | } |
915 | |
916 | close(fd); |
917 | } |
918 | |
919 | int walk_tree(const char *name, const struct stat *st, int type, struct FTW *f) |
920 | { |
921 | (void)f; |
922 | switch (type) { |
923 | case FTW_F: |
924 | if (S_ISREG(st->st_mode)) |
925 | walk_file(name, st); |
926 | break; |
927 | case FTW_DNR: |
928 | fprintf(stderr, "cannot read dir: %s\n", name); |
929 | break; |
930 | } |
931 | return 0; |
932 | } |
933 | |
934 | static void walk_page_cache(void) |
935 | { |
936 | struct stat st; |
937 | |
938 | kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY); |
939 | pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY); |
940 | sigaction(SIGBUS, &sigbus_action, NULL); |
941 | |
942 | if (stat(opt_file, &st)) |
943 | fatal("stat failed: %s\n", opt_file); |
944 | |
945 | if (S_ISREG(st.st_mode)) { |
946 | walk_file(opt_file, &st); |
947 | } else if (S_ISDIR(st.st_mode)) { |
948 | /* do not follow symlinks and mountpoints */ |
949 | if (nftw(opt_file, walk_tree, 64, FTW_MOUNT | FTW_PHYS) < 0) |
950 | fatal("nftw failed: %s\n", opt_file); |
951 | } else |
952 | fatal("unhandled file type: %s\n", opt_file); |
953 | |
954 | close(kpageflags_fd); |
955 | close(pagemap_fd); |
956 | signal(SIGBUS, SIG_DFL); |
957 | } |
958 | |
959 | static void parse_file(const char *name) |
960 | { |
961 | opt_file = name; |
962 | } |
963 | |
964 | static void parse_addr_range(const char *optarg) |
965 | { |
966 | unsigned long offset; |
967 | unsigned long size; |
968 | char *p; |
969 | |
970 | p = strchr(optarg, ','); |
971 | if (!p) |
972 | p = strchr(optarg, '+'); |
973 | |
974 | if (p == optarg) { |
975 | offset = 0; |
976 | size = parse_number(p + 1); |
977 | } else if (p) { |
978 | offset = parse_number(optarg); |
979 | if (p[1] == '\0') |
980 | size = ULONG_MAX; |
981 | else { |
982 | size = parse_number(p + 1); |
983 | if (*p == ',') { |
984 | if (size < offset) |
985 | fatal("invalid range: %lu,%lu\n", |
986 | offset, size); |
987 | size -= offset; |
988 | } |
989 | } |
990 | } else { |
991 | offset = parse_number(optarg); |
992 | size = 1; |
993 | } |
994 | |
995 | add_addr_range(offset, size); |
996 | } |
997 | |
998 | static void add_bits_filter(uint64_t mask, uint64_t bits) |
999 | { |
1000 | if (nr_bit_filters >= MAX_BIT_FILTERS) |
1001 | fatal("too much bit filters\n"); |
1002 | |
1003 | opt_mask[nr_bit_filters] = mask; |
1004 | opt_bits[nr_bit_filters] = bits; |
1005 | nr_bit_filters++; |
1006 | } |
1007 | |
1008 | static uint64_t parse_flag_name(const char *str, int len) |
1009 | { |
1010 | size_t i; |
1011 | |
1012 | if (!*str || !len) |
1013 | return 0; |
1014 | |
1015 | if (len <= 8 && !strncmp(str, "compound", len)) |
1016 | return BITS_COMPOUND; |
1017 | |
1018 | for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
1019 | if (!page_flag_names[i]) |
1020 | continue; |
1021 | if (!strncmp(str, page_flag_names[i] + 2, len)) |
1022 | return 1ULL << i; |
1023 | } |
1024 | |
1025 | return parse_number(str); |
1026 | } |
1027 | |
1028 | static uint64_t parse_flag_names(const char *str, int all) |
1029 | { |
1030 | const char *p = str; |
1031 | uint64_t flags = 0; |
1032 | |
1033 | while (1) { |
1034 | if (*p == ',' || *p == '=' || *p == '\0') { |
1035 | if ((*str != '~') || (*str == '~' && all && *++str)) |
1036 | flags |= parse_flag_name(str, p - str); |
1037 | if (*p != ',') |
1038 | break; |
1039 | str = p + 1; |
1040 | } |
1041 | p++; |
1042 | } |
1043 | |
1044 | return flags; |
1045 | } |
1046 | |
1047 | static void parse_bits_mask(const char *optarg) |
1048 | { |
1049 | uint64_t mask; |
1050 | uint64_t bits; |
1051 | const char *p; |
1052 | |
1053 | p = strchr(optarg, '='); |
1054 | if (p == optarg) { |
1055 | mask = KPF_ALL_BITS; |
1056 | bits = parse_flag_names(p + 1, 0); |
1057 | } else if (p) { |
1058 | mask = parse_flag_names(optarg, 0); |
1059 | bits = parse_flag_names(p + 1, 0); |
1060 | } else if (strchr(optarg, '~')) { |
1061 | mask = parse_flag_names(optarg, 1); |
1062 | bits = parse_flag_names(optarg, 0); |
1063 | } else { |
1064 | mask = parse_flag_names(optarg, 0); |
1065 | bits = KPF_ALL_BITS; |
1066 | } |
1067 | |
1068 | add_bits_filter(mask, bits); |
1069 | } |
1070 | |
1071 | static void describe_flags(const char *optarg) |
1072 | { |
1073 | uint64_t flags = parse_flag_names(optarg, 0); |
1074 | |
1075 | printf("0x%016llx\t%s\t%s\n", |
1076 | (unsigned long long)flags, |
1077 | page_flag_name(flags), |
1078 | page_flag_longname(flags)); |
1079 | } |
1080 | |
1081 | static const struct option opts[] = { |
1082 | { "raw" , 0, NULL, 'r' }, |
1083 | { "pid" , 1, NULL, 'p' }, |
1084 | { "file" , 1, NULL, 'f' }, |
1085 | { "addr" , 1, NULL, 'a' }, |
1086 | { "bits" , 1, NULL, 'b' }, |
1087 | { "describe" , 1, NULL, 'd' }, |
1088 | { "list" , 0, NULL, 'l' }, |
1089 | { "list-each" , 0, NULL, 'L' }, |
1090 | { "no-summary", 0, NULL, 'N' }, |
1091 | { "hwpoison" , 0, NULL, 'X' }, |
1092 | { "unpoison" , 0, NULL, 'x' }, |
1093 | { "help" , 0, NULL, 'h' }, |
1094 | { NULL , 0, NULL, 0 } |
1095 | }; |
1096 | |
1097 | int main(int argc, char *argv[]) |
1098 | { |
1099 | int c; |
1100 | |
1101 | page_size = getpagesize(); |
1102 | |
1103 | while ((c = getopt_long(argc, argv, |
1104 | "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) { |
1105 | switch (c) { |
1106 | case 'r': |
1107 | opt_raw = 1; |
1108 | break; |
1109 | case 'p': |
1110 | parse_pid(optarg); |
1111 | break; |
1112 | case 'f': |
1113 | parse_file(optarg); |
1114 | break; |
1115 | case 'a': |
1116 | parse_addr_range(optarg); |
1117 | break; |
1118 | case 'b': |
1119 | parse_bits_mask(optarg); |
1120 | break; |
1121 | case 'd': |
1122 | describe_flags(optarg); |
1123 | exit(0); |
1124 | case 'l': |
1125 | opt_list = 1; |
1126 | break; |
1127 | case 'L': |
1128 | opt_list = 2; |
1129 | break; |
1130 | case 'N': |
1131 | opt_no_summary = 1; |
1132 | break; |
1133 | case 'X': |
1134 | opt_hwpoison = 1; |
1135 | prepare_hwpoison_fd(); |
1136 | break; |
1137 | case 'x': |
1138 | opt_unpoison = 1; |
1139 | prepare_hwpoison_fd(); |
1140 | break; |
1141 | case 'h': |
1142 | usage(); |
1143 | exit(0); |
1144 | default: |
1145 | usage(); |
1146 | exit(1); |
1147 | } |
1148 | } |
1149 | |
1150 | if (opt_list && opt_pid) |
1151 | printf("voffset\t"); |
1152 | if (opt_list && opt_file) |
1153 | printf("foffset\t"); |
1154 | if (opt_list == 1) |
1155 | printf("offset\tlen\tflags\n"); |
1156 | if (opt_list == 2) |
1157 | printf("offset\tflags\n"); |
1158 | |
1159 | if (opt_file) |
1160 | walk_page_cache(); |
1161 | else |
1162 | walk_addr_ranges(); |
1163 | |
1164 | if (opt_list == 1) |
1165 | flush_page_range(); |
1166 | |
1167 | if (opt_no_summary) |
1168 | return 0; |
1169 | |
1170 | if (opt_list) |
1171 | printf("\n\n"); |
1172 | |
1173 | show_summary(); |
1174 | |
1175 | return 0; |
1176 | } |
1177 |
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v2.6.34-rc5
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