2 * page-types: Tool for querying page flags
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.
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
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.
17 * Copyright (C) 2009 Intel corporation
19 * Authors: Wu Fengguang <fengguang.wu@intel.com>
22 #define _FILE_OFFSET_BITS 64
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>
43 #include "../../include/uapi/linux/magic.h"
44 #include "../../include/uapi/linux/kernel-page-flags.h"
45 #include <api/fs/debugfs.h>
53 # define STR(x) _STR(x)
57 * pagemap kernel ABI bits
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)
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)
83 #define PROC_KPAGEFLAGS "/proc/kpageflags"
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
93 #define KPF_UNCACHED 39
94 #define KPF_SOFTDIRTY 40
96 /* [48-] take some arbitrary free slots for expanding overloaded flags
97 * not part of kernel API
99 #define KPF_READAHEAD 48
100 #define KPF_SLOB_FREE 49
101 #define KPF_SLUB_FROZEN 50
102 #define KPF_SLUB_DEBUG 51
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))
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",
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",
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",
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",
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",
153 static const char * const debugfs_known_mountpoints
[] = {
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
;
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
];
174 #define MAX_VMAS 10240
176 static unsigned long pg_start
[MAX_VMAS
];
177 static unsigned long pg_end
[MAX_VMAS
];
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
];
184 static int page_size
;
186 static int pagemap_fd
;
187 static int kpageflags_fd
;
189 static int opt_hwpoison
;
190 static int opt_unpoison
;
192 static char *hwpoison_debug_fs
;
193 static int hwpoison_inject_fd
;
194 static int hwpoison_forget_fd
;
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)
201 static unsigned long total_pages
;
202 static unsigned long nr_pages
[HASH_SIZE
];
203 static uint64_t page_flags
[HASH_SIZE
];
210 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
212 #define min_t(type, x, y) ({ \
215 __min1 < __min2 ? __min1 : __min2; })
217 #define max_t(type, x, y) ({ \
220 __max1 > __max2 ? __max1 : __max2; })
222 static unsigned long pages2mb(unsigned long pages
)
224 return (pages
* page_size
) >> 20;
227 static void fatal(const char *x
, ...)
232 vfprintf(stderr
, x
, ap
);
237 static int checked_open(const char *pathname
, int flags
)
239 int fd
= open(pathname
, flags
);
250 * pagemap/kpageflags routines
253 static unsigned long do_u64_read(int fd
, char *name
,
260 if (index
> ULONG_MAX
/ 8)
261 fatal("index overflow: %lu\n", index
);
263 bytes
= pread(fd
, buf
, count
* 8, (off_t
)index
* 8);
269 fatal("partial read: %lu bytes\n", bytes
);
274 static unsigned long kpageflags_read(uint64_t *buf
,
278 return do_u64_read(kpageflags_fd
, PROC_KPAGEFLAGS
, buf
, index
, pages
);
281 static unsigned long pagemap_read(uint64_t *buf
,
285 return do_u64_read(pagemap_fd
, "/proc/pid/pagemap", buf
, index
, pages
);
288 static unsigned long pagemap_pfn(uint64_t val
)
292 if (val
& PM_PRESENT
)
293 pfn
= PM_PFRAME(val
);
305 static char *page_flag_name(uint64_t flags
)
311 for (i
= 0, j
= 0; i
< ARRAY_SIZE(page_flag_names
); i
++) {
312 present
= (flags
>> i
) & 1;
313 if (!page_flag_names
[i
]) {
315 fatal("unknown flag bit %d\n", i
);
318 buf
[j
++] = present
? page_flag_names
[i
][0] : '_';
324 static char *page_flag_longname(uint64_t flags
)
326 static char buf
[1024];
329 for (i
= 0, n
= 0; i
< ARRAY_SIZE(page_flag_names
); i
++) {
330 if (!page_flag_names
[i
])
332 if ((flags
>> i
) & 1)
333 n
+= snprintf(buf
+ n
, sizeof(buf
) - n
, "%s,",
334 page_flag_names
[i
] + 2);
345 * page list and summary
348 static void show_page_range(unsigned long voffset
, unsigned long offset
,
349 unsigned long size
, uint64_t flags
)
351 static uint64_t flags0
;
352 static unsigned long voff
;
353 static unsigned long index
;
354 static unsigned long count
;
356 if (flags
== flags0
&& offset
== index
+ count
&&
357 size
&& voffset
== voff
+ count
) {
364 printf("%lx\t", voff
);
366 printf("%lu\t", voff
);
367 printf("%lx\t%lx\t%s\n",
368 index
, count
, page_flag_name(flags0
));
377 static void flush_page_range(void)
379 show_page_range(0, 0, 0, 0);
382 static void show_page(unsigned long voffset
,
383 unsigned long offset
, uint64_t flags
)
386 printf("%lx\t", voffset
);
388 printf("%lu\t", voffset
);
389 printf("%lx\t%s\n", offset
, page_flag_name(flags
));
392 static void show_summary(void)
396 printf(" flags\tpage-count MB"
397 " symbolic-flags\t\t\tlong-symbolic-flags\n");
399 for (i
= 0; i
< ARRAY_SIZE(nr_pages
); i
++) {
401 printf("0x%016llx\t%10lu %8lu %s\t%s\n",
402 (unsigned long long)page_flags
[i
],
404 pages2mb(nr_pages
[i
]),
405 page_flag_name(page_flags
[i
]),
406 page_flag_longname(page_flags
[i
]));
409 printf(" total\t%10lu %8lu\n",
410 total_pages
, pages2mb(total_pages
));
418 static int bit_mask_ok(uint64_t flags
)
422 for (i
= 0; i
< nr_bit_filters
; i
++) {
423 if (opt_bits
[i
] == KPF_ALL_BITS
) {
424 if ((flags
& opt_mask
[i
]) == 0)
427 if ((flags
& opt_mask
[i
]) != opt_bits
[i
])
435 static uint64_t expand_overloaded_flags(uint64_t flags
, uint64_t pme
)
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
);
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
);
451 if (pme
& PM_SOFT_DIRTY
)
452 flags
|= BIT(SOFTDIRTY
);
457 static uint64_t well_known_flags(uint64_t flags
)
459 /* hide flags intended only for kernel hacker */
460 flags
&= ~KPF_HACKERS_BITS
;
462 /* hide non-hugeTLB compound pages */
463 if ((flags
& BITS_COMPOUND
) && !(flags
& BIT(HUGE
)))
464 flags
&= ~BITS_COMPOUND
;
469 static uint64_t kpageflags_flags(uint64_t flags
, uint64_t pme
)
472 flags
= expand_overloaded_flags(flags
, pme
);
474 flags
= well_known_flags(flags
);
483 static void prepare_hwpoison_fd(void)
485 char buf
[MAX_PATH
+ 1];
487 hwpoison_debug_fs
= debugfs_mount(NULL
);
488 if (!hwpoison_debug_fs
) {
489 perror("mount debugfs");
493 if (opt_hwpoison
&& !hwpoison_inject_fd
) {
494 snprintf(buf
, MAX_PATH
, "%s/hwpoison/corrupt-pfn",
496 hwpoison_inject_fd
= checked_open(buf
, O_WRONLY
);
499 if (opt_unpoison
&& !hwpoison_forget_fd
) {
500 snprintf(buf
, MAX_PATH
, "%s/hwpoison/unpoison-pfn",
502 hwpoison_forget_fd
= checked_open(buf
, O_WRONLY
);
506 static int hwpoison_page(unsigned long offset
)
511 len
= sprintf(buf
, "0x%lx\n", offset
);
512 len
= write(hwpoison_inject_fd
, buf
, len
);
514 perror("hwpoison inject");
520 static int unpoison_page(unsigned long offset
)
525 len
= sprintf(buf
, "0x%lx\n", offset
);
526 len
= write(hwpoison_forget_fd
, buf
, len
);
528 perror("hwpoison forget");
538 static size_t hash_slot(uint64_t flags
)
540 size_t k
= HASH_KEY(flags
);
543 /* Explicitly reserve slot 0 for flags 0: the following logic
544 * cannot distinguish an unoccupied slot from slot (flags==0).
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
))
553 if (page_flags
[k
] == 0) {
554 page_flags
[k
] = flags
;
557 if (page_flags
[k
] == flags
)
561 fatal("hash table full: bump up HASH_SHIFT?\n");
565 static void add_page(unsigned long voffset
,
566 unsigned long offset
, uint64_t flags
, uint64_t pme
)
568 flags
= kpageflags_flags(flags
, pme
);
570 if (!bit_mask_ok(flags
))
574 hwpoison_page(offset
);
576 unpoison_page(offset
);
579 show_page_range(voffset
, offset
, 1, flags
);
580 else if (opt_list
== 2)
581 show_page(voffset
, offset
, flags
);
583 nr_pages
[hash_slot(flags
)]++;
587 #define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
588 static void walk_pfn(unsigned long voffset
,
593 uint64_t buf
[KPAGEFLAGS_BATCH
];
599 batch
= min_t(unsigned long, count
, KPAGEFLAGS_BATCH
);
600 pages
= kpageflags_read(buf
, index
, batch
);
604 for (i
= 0; i
< pages
; i
++)
605 add_page(voffset
+ i
, index
+ i
, buf
[i
], pme
);
612 #define PAGEMAP_BATCH (64 << 10)
613 static void walk_vma(unsigned long index
, unsigned long count
)
615 uint64_t buf
[PAGEMAP_BATCH
];
622 batch
= min_t(unsigned long, count
, PAGEMAP_BATCH
);
623 pages
= pagemap_read(buf
, index
, batch
);
627 for (i
= 0; i
< pages
; i
++) {
628 pfn
= pagemap_pfn(buf
[i
]);
630 walk_pfn(index
+ i
, pfn
, 1, buf
[i
]);
638 static void walk_task(unsigned long index
, unsigned long count
)
640 const unsigned long end
= index
+ count
;
644 while (index
< end
) {
646 while (pg_end
[i
] <= index
)
649 if (pg_start
[i
] >= end
)
652 start
= max_t(unsigned long, pg_start
[i
], index
);
653 index
= min_t(unsigned long, pg_end
[i
], end
);
655 assert(start
< index
);
656 walk_vma(start
, index
- start
);
660 static void add_addr_range(unsigned long offset
, unsigned long size
)
662 if (nr_addr_ranges
>= MAX_ADDR_RANGES
)
663 fatal("too many addr ranges\n");
665 opt_offset
[nr_addr_ranges
] = offset
;
666 opt_size
[nr_addr_ranges
] = min_t(unsigned long, size
, ULONG_MAX
-offset
);
670 static void walk_addr_ranges(void)
674 kpageflags_fd
= checked_open(PROC_KPAGEFLAGS
, O_RDONLY
);
677 add_addr_range(0, ULONG_MAX
);
679 for (i
= 0; i
< nr_addr_ranges
; i
++)
681 walk_pfn(opt_offset
[i
], opt_offset
[i
], opt_size
[i
], 0);
683 walk_task(opt_offset
[i
], opt_size
[i
]);
685 close(kpageflags_fd
);
693 static const char *page_flag_type(uint64_t flag
)
695 if (flag
& KPF_HACKERS_BITS
)
697 if (flag
& KPF_OVERLOADED_BITS
)
702 static void usage(void)
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"
721 " 0x10 bitfield format, e.g.\n"
722 " anon bit-name, e.g.\n"
723 " 0x10,anon comma-separated list, e.g.\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"
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"
738 for (i
= 0, j
= 0; i
< ARRAY_SIZE(page_flag_names
); i
++) {
739 if (!page_flag_names
[i
])
741 printf("%16s%s", page_flag_names
[i
] + 2,
742 page_flag_type(1ULL << i
));
749 "(r) raw mode bits (o) overloaded bits\n");
752 static unsigned long long parse_number(const char *str
)
754 unsigned long long n
;
756 n
= strtoll(str
, NULL
, 0);
758 if (n
== 0 && str
[0] != '0')
759 fatal("invalid name or number: %s\n", str
);
764 static void parse_pid(const char *str
)
769 opt_pid
= parse_number(str
);
771 sprintf(buf
, "/proc/%d/pagemap", opt_pid
);
772 pagemap_fd
= checked_open(buf
, O_RDONLY
);
774 sprintf(buf
, "/proc/%d/maps", opt_pid
);
775 file
= fopen(buf
, "r");
781 while (fgets(buf
, sizeof(buf
), file
) != NULL
) {
782 unsigned long vm_start
;
783 unsigned long vm_end
;
784 unsigned long long pgoff
;
790 n
= sscanf(buf
, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
798 fprintf(stderr
, "unexpected line: %s\n", buf
);
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");
811 static void show_file(const char *name
, const struct stat
*st
)
813 unsigned long long size
= st
->st_size
;
814 char atime
[64], mtime
[64];
815 long now
= time(NULL
);
817 printf("%s\tInode: %u\tSize: %llu (%llu pages)\n",
818 name
, (unsigned)st
->st_ino
,
819 size
, (size
+ page_size
- 1) / page_size
);
821 strftime(atime
, sizeof(atime
), "%c", localtime(&st
->st_atime
));
822 strftime(mtime
, sizeof(mtime
), "%c", localtime(&st
->st_mtime
));
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
);
829 static sigjmp_buf sigbus_jmp
;
831 static void * volatile sigbus_addr
;
833 static void sigbus_handler(int sig
, siginfo_t
*info
, void *ucontex
)
837 sigbus_addr
= info
? info
->si_addr
: NULL
;
838 siglongjmp(sigbus_jmp
, 1);
841 static struct sigaction sigbus_action
= {
842 .sa_sigaction
= sigbus_handler
,
843 .sa_flags
= SA_SIGINFO
,
846 static void walk_file(const char *name
, const struct stat
*st
)
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
;
857 fd
= checked_open(name
, O_RDONLY
|O_NOATIME
|O_NOFOLLOW
);
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
;
865 ptr
= mmap(NULL
, len
, PROT_READ
, MAP_SHARED
, fd
, off
);
866 if (ptr
== MAP_FAILED
)
867 fatal("mmap failed: %s", name
);
869 /* determine cached pages */
870 if (mincore(ptr
, len
, vec
))
871 fatal("mincore failed: %s", name
);
873 /* turn off readahead */
874 if (madvise(ptr
, len
, MADV_RANDOM
))
875 fatal("madvice failed: %s", name
);
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
);
885 for (i
= 0; i
< nr_pages
; i
++) {
887 (void)*(volatile int *)(ptr
+ i
* page_size
);
891 /* turn off harvesting reference bits */
892 if (madvise(ptr
, len
, MADV_SEQUENTIAL
))
893 fatal("madvice failed: %s", name
);
895 if (pagemap_read(buf
, (unsigned long)ptr
/ page_size
,
896 nr_pages
) != nr_pages
)
897 fatal("cannot read pagemap");
901 for (i
= 0; i
< nr_pages
; i
++) {
902 pfn
= pagemap_pfn(buf
[i
]);
905 if (!kpageflags_read(&flags
, pfn
, 1))
907 if (first
&& opt_list
) {
912 add_page(off
/ page_size
+ i
, pfn
, flags
, buf
[i
]);
919 int walk_tree(const char *name
, const struct stat
*st
, int type
, struct FTW
*f
)
924 if (S_ISREG(st
->st_mode
))
928 fprintf(stderr
, "cannot read dir: %s\n", name
);
934 static void walk_page_cache(void)
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
);
942 if (stat(opt_file
, &st
))
943 fatal("stat failed: %s\n", opt_file
);
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
);
952 fatal("unhandled file type: %s\n", opt_file
);
954 close(kpageflags_fd
);
956 signal(SIGBUS
, SIG_DFL
);
959 static void parse_file(const char *name
)
964 static void parse_addr_range(const char *optarg
)
966 unsigned long offset
;
970 p
= strchr(optarg
, ',');
972 p
= strchr(optarg
, '+');
976 size
= parse_number(p
+ 1);
978 offset
= parse_number(optarg
);
982 size
= parse_number(p
+ 1);
985 fatal("invalid range: %lu,%lu\n",
991 offset
= parse_number(optarg
);
995 add_addr_range(offset
, size
);
998 static void add_bits_filter(uint64_t mask
, uint64_t bits
)
1000 if (nr_bit_filters
>= MAX_BIT_FILTERS
)
1001 fatal("too much bit filters\n");
1003 opt_mask
[nr_bit_filters
] = mask
;
1004 opt_bits
[nr_bit_filters
] = bits
;
1008 static uint64_t parse_flag_name(const char *str
, int len
)
1015 if (len
<= 8 && !strncmp(str
, "compound", len
))
1016 return BITS_COMPOUND
;
1018 for (i
= 0; i
< ARRAY_SIZE(page_flag_names
); i
++) {
1019 if (!page_flag_names
[i
])
1021 if (!strncmp(str
, page_flag_names
[i
] + 2, len
))
1025 return parse_number(str
);
1028 static uint64_t parse_flag_names(const char *str
, int all
)
1030 const char *p
= str
;
1034 if (*p
== ',' || *p
== '=' || *p
== '\0') {
1035 if ((*str
!= '~') || (*str
== '~' && all
&& *++str
))
1036 flags
|= parse_flag_name(str
, p
- str
);
1047 static void parse_bits_mask(const char *optarg
)
1053 p
= strchr(optarg
, '=');
1055 mask
= KPF_ALL_BITS
;
1056 bits
= parse_flag_names(p
+ 1, 0);
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);
1064 mask
= parse_flag_names(optarg
, 0);
1065 bits
= KPF_ALL_BITS
;
1068 add_bits_filter(mask
, bits
);
1071 static void describe_flags(const char *optarg
)
1073 uint64_t flags
= parse_flag_names(optarg
, 0);
1075 printf("0x%016llx\t%s\t%s\n",
1076 (unsigned long long)flags
,
1077 page_flag_name(flags
),
1078 page_flag_longname(flags
));
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 }
1097 int main(int argc
, char *argv
[])
1101 page_size
= getpagesize();
1103 while ((c
= getopt_long(argc
, argv
,
1104 "rp:f:a:b:d:lLNXxh", opts
, NULL
)) != -1) {
1116 parse_addr_range(optarg
);
1119 parse_bits_mask(optarg
);
1122 describe_flags(optarg
);
1135 prepare_hwpoison_fd();
1139 prepare_hwpoison_fd();
1150 if (opt_list
&& opt_pid
)
1151 printf("voffset\t");
1152 if (opt_list
&& opt_file
)
1153 printf("foffset\t");
1155 printf("offset\tlen\tflags\n");
1157 printf("offset\tflags\n");