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",
135 [KPF_BALLOON] = "o:balloon",
136 [KPF_ZERO_PAGE] = "z:zero_page",
138 [KPF_RESERVED] = "r:reserved",
139 [KPF_MLOCKED] = "m:mlocked",
140 [KPF_MAPPEDTODISK] = "d:mappedtodisk",
141 [KPF_PRIVATE] = "P:private",
142 [KPF_PRIVATE_2] = "p:private_2",
143 [KPF_OWNER_PRIVATE] = "O:owner_private",
144 [KPF_ARCH] = "h:arch",
145 [KPF_UNCACHED] = "c:uncached",
146 [KPF_SOFTDIRTY] = "f:softdirty",
148 [KPF_READAHEAD] = "I:readahead",
149 [KPF_SLOB_FREE] = "P:slob_free",
150 [KPF_SLUB_FROZEN] = "A:slub_frozen",
151 [KPF_SLUB_DEBUG] = "E:slub_debug",
155 static const char * const debugfs_known_mountpoints[] = {
165 static int opt_raw; /* for kernel developers */
166 static int opt_list; /* list pages (in ranges) */
167 static int opt_no_summary; /* don't show summary */
168 static pid_t opt_pid; /* process to walk */
169 const char * opt_file;
171 #define MAX_ADDR_RANGES 1024
172 static int nr_addr_ranges;
173 static unsigned long opt_offset[MAX_ADDR_RANGES];
174 static unsigned long opt_size[MAX_ADDR_RANGES];
176 #define MAX_VMAS 10240
178 static unsigned long pg_start[MAX_VMAS];
179 static unsigned long pg_end[MAX_VMAS];
181 #define MAX_BIT_FILTERS 64
182 static int nr_bit_filters;
183 static uint64_t opt_mask[MAX_BIT_FILTERS];
184 static uint64_t opt_bits[MAX_BIT_FILTERS];
186 static int page_size;
188 static int pagemap_fd;
189 static int kpageflags_fd;
191 static int opt_hwpoison;
192 static int opt_unpoison;
194 static char *hwpoison_debug_fs;
195 static int hwpoison_inject_fd;
196 static int hwpoison_forget_fd;
198 #define HASH_SHIFT 13
199 #define HASH_SIZE (1 << HASH_SHIFT)
200 #define HASH_MASK (HASH_SIZE - 1)
201 #define HASH_KEY(flags) (flags & HASH_MASK)
203 static unsigned long total_pages;
204 static unsigned long nr_pages[HASH_SIZE];
205 static uint64_t page_flags[HASH_SIZE];
212 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
214 #define min_t(type, x, y) ({ \
217 __min1 < __min2 ? __min1 : __min2; })
219 #define max_t(type, x, y) ({ \
222 __max1 > __max2 ? __max1 : __max2; })
224 static unsigned long pages2mb(unsigned long pages)
226 return (pages * page_size) >> 20;
229 static void fatal(const char *x, ...)
234 vfprintf(stderr, x, ap);
239 static int checked_open(const char *pathname, int flags)
241 int fd = open(pathname, flags);
252 * pagemap/kpageflags routines
255 static unsigned long do_u64_read(int fd, char *name,
262 if (index > ULONG_MAX / 8)
263 fatal("index overflow: %lu\n", index);
265 bytes = pread(fd, buf, count * 8, (off_t)index * 8);
271 fatal("partial read: %lu bytes\n", bytes);
276 static unsigned long kpageflags_read(uint64_t *buf,
280 return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages);
283 static unsigned long pagemap_read(uint64_t *buf,
287 return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages);
290 static unsigned long pagemap_pfn(uint64_t val)
294 if (val & PM_PRESENT)
295 pfn = PM_PFRAME(val);
307 static char *page_flag_name(uint64_t flags)
313 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
314 present = (flags >> i) & 1;
315 if (!page_flag_names[i]) {
317 fatal("unknown flag bit %d\n", i);
320 buf[j++] = present ? page_flag_names[i][0] : '_';
326 static char *page_flag_longname(uint64_t flags)
328 static char buf[1024];
331 for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) {
332 if (!page_flag_names[i])
334 if ((flags >> i) & 1)
335 n += snprintf(buf + n, sizeof(buf) - n, "%s,",
336 page_flag_names[i] + 2);
347 * page list and summary
350 static void show_page_range(unsigned long voffset, unsigned long offset,
351 unsigned long size, uint64_t flags)
353 static uint64_t flags0;
354 static unsigned long voff;
355 static unsigned long index;
356 static unsigned long count;
358 if (flags == flags0 && offset == index + count &&
359 size && voffset == voff + count) {
366 printf("%lx\t", voff);
368 printf("%lu\t", voff);
369 printf("%lx\t%lx\t%s\n",
370 index, count, page_flag_name(flags0));
379 static void flush_page_range(void)
381 show_page_range(0, 0, 0, 0);
384 static void show_page(unsigned long voffset,
385 unsigned long offset, uint64_t flags)
388 printf("%lx\t", voffset);
390 printf("%lu\t", voffset);
391 printf("%lx\t%s\n", offset, page_flag_name(flags));
394 static void show_summary(void)
398 printf(" flags\tpage-count MB"
399 " symbolic-flags\t\t\tlong-symbolic-flags\n");
401 for (i = 0; i < ARRAY_SIZE(nr_pages); i++) {
403 printf("0x%016llx\t%10lu %8lu %s\t%s\n",
404 (unsigned long long)page_flags[i],
406 pages2mb(nr_pages[i]),
407 page_flag_name(page_flags[i]),
408 page_flag_longname(page_flags[i]));
411 printf(" total\t%10lu %8lu\n",
412 total_pages, pages2mb(total_pages));
420 static int bit_mask_ok(uint64_t flags)
424 for (i = 0; i < nr_bit_filters; i++) {
425 if (opt_bits[i] == KPF_ALL_BITS) {
426 if ((flags & opt_mask[i]) == 0)
429 if ((flags & opt_mask[i]) != opt_bits[i])
437 static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme)
439 /* SLOB/SLUB overload several page flags */
440 if (flags & BIT(SLAB)) {
441 if (flags & BIT(PRIVATE))
442 flags ^= BIT(PRIVATE) | BIT(SLOB_FREE);
443 if (flags & BIT(ACTIVE))
444 flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN);
445 if (flags & BIT(ERROR))
446 flags ^= BIT(ERROR) | BIT(SLUB_DEBUG);
449 /* PG_reclaim is overloaded as PG_readahead in the read path */
450 if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM))
451 flags ^= BIT(RECLAIM) | BIT(READAHEAD);
453 if (pme & PM_SOFT_DIRTY)
454 flags |= BIT(SOFTDIRTY);
459 static uint64_t well_known_flags(uint64_t flags)
461 /* hide flags intended only for kernel hacker */
462 flags &= ~KPF_HACKERS_BITS;
464 /* hide non-hugeTLB compound pages */
465 if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE)))
466 flags &= ~BITS_COMPOUND;
471 static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme)
474 flags = expand_overloaded_flags(flags, pme);
476 flags = well_known_flags(flags);
485 static void prepare_hwpoison_fd(void)
487 char buf[MAX_PATH + 1];
489 hwpoison_debug_fs = debugfs_mount(NULL);
490 if (!hwpoison_debug_fs) {
491 perror("mount debugfs");
495 if (opt_hwpoison && !hwpoison_inject_fd) {
496 snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn",
498 hwpoison_inject_fd = checked_open(buf, O_WRONLY);
501 if (opt_unpoison && !hwpoison_forget_fd) {
502 snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn",
504 hwpoison_forget_fd = checked_open(buf, O_WRONLY);
508 static int hwpoison_page(unsigned long offset)
513 len = sprintf(buf, "0x%lx\n", offset);
514 len = write(hwpoison_inject_fd, buf, len);
516 perror("hwpoison inject");
522 static int unpoison_page(unsigned long offset)
527 len = sprintf(buf, "0x%lx\n", offset);
528 len = write(hwpoison_forget_fd, buf, len);
530 perror("hwpoison forget");
540 static size_t hash_slot(uint64_t flags)
542 size_t k = HASH_KEY(flags);
545 /* Explicitly reserve slot 0 for flags 0: the following logic
546 * cannot distinguish an unoccupied slot from slot (flags==0).
551 /* search through the remaining (HASH_SIZE-1) slots */
552 for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) {
553 if (!k || k >= ARRAY_SIZE(page_flags))
555 if (page_flags[k] == 0) {
556 page_flags[k] = flags;
559 if (page_flags[k] == flags)
563 fatal("hash table full: bump up HASH_SHIFT?\n");
567 static void add_page(unsigned long voffset,
568 unsigned long offset, uint64_t flags, uint64_t pme)
570 flags = kpageflags_flags(flags, pme);
572 if (!bit_mask_ok(flags))
576 hwpoison_page(offset);
578 unpoison_page(offset);
581 show_page_range(voffset, offset, 1, flags);
582 else if (opt_list == 2)
583 show_page(voffset, offset, flags);
585 nr_pages[hash_slot(flags)]++;
589 #define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */
590 static void walk_pfn(unsigned long voffset,
595 uint64_t buf[KPAGEFLAGS_BATCH];
601 batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
602 pages = kpageflags_read(buf, index, batch);
606 for (i = 0; i < pages; i++)
607 add_page(voffset + i, index + i, buf[i], pme);
614 #define PAGEMAP_BATCH (64 << 10)
615 static void walk_vma(unsigned long index, unsigned long count)
617 uint64_t buf[PAGEMAP_BATCH];
624 batch = min_t(unsigned long, count, PAGEMAP_BATCH);
625 pages = pagemap_read(buf, index, batch);
629 for (i = 0; i < pages; i++) {
630 pfn = pagemap_pfn(buf[i]);
632 walk_pfn(index + i, pfn, 1, buf[i]);
640 static void walk_task(unsigned long index, unsigned long count)
642 const unsigned long end = index + count;
646 while (index < end) {
648 while (pg_end[i] <= index)
651 if (pg_start[i] >= end)
654 start = max_t(unsigned long, pg_start[i], index);
655 index = min_t(unsigned long, pg_end[i], end);
657 assert(start < index);
658 walk_vma(start, index - start);
662 static void add_addr_range(unsigned long offset, unsigned long size)
664 if (nr_addr_ranges >= MAX_ADDR_RANGES)
665 fatal("too many addr ranges\n");
667 opt_offset[nr_addr_ranges] = offset;
668 opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset);
672 static void walk_addr_ranges(void)
676 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
679 add_addr_range(0, ULONG_MAX);
681 for (i = 0; i < nr_addr_ranges; i++)
683 walk_pfn(opt_offset[i], opt_offset[i], opt_size[i], 0);
685 walk_task(opt_offset[i], opt_size[i]);
687 close(kpageflags_fd);
695 static const char *page_flag_type(uint64_t flag)
697 if (flag & KPF_HACKERS_BITS)
699 if (flag & KPF_OVERLOADED_BITS)
704 static void usage(void)
709 "page-types [options]\n"
710 " -r|--raw Raw mode, for kernel developers\n"
711 " -d|--describe flags Describe flags\n"
712 " -a|--addr addr-spec Walk a range of pages\n"
713 " -b|--bits bits-spec Walk pages with specified bits\n"
714 " -p|--pid pid Walk process address space\n"
715 " -f|--file filename Walk file address space\n"
716 " -l|--list Show page details in ranges\n"
717 " -L|--list-each Show page details one by one\n"
718 " -N|--no-summary Don't show summary info\n"
719 " -X|--hwpoison hwpoison pages\n"
720 " -x|--unpoison unpoison pages\n"
721 " -h|--help Show this usage message\n"
723 " 0x10 bitfield format, e.g.\n"
724 " anon bit-name, e.g.\n"
725 " 0x10,anon comma-separated list, e.g.\n"
727 " N one page at offset N (unit: pages)\n"
728 " N+M pages range from N to N+M-1\n"
729 " N,M pages range from N to M-1\n"
730 " N, pages range from N to end\n"
731 " ,M pages range from 0 to M-1\n"
733 " bit1,bit2 (flags & (bit1|bit2)) != 0\n"
734 " bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
735 " bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
736 " =bit1,bit2 flags == (bit1|bit2)\n"
740 for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) {
741 if (!page_flag_names[i])
743 printf("%16s%s", page_flag_names[i] + 2,
744 page_flag_type(1ULL << i));
751 "(r) raw mode bits (o) overloaded bits\n");
754 static unsigned long long parse_number(const char *str)
756 unsigned long long n;
758 n = strtoll(str, NULL, 0);
760 if (n == 0 && str[0] != '0')
761 fatal("invalid name or number: %s\n", str);
766 static void parse_pid(const char *str)
771 opt_pid = parse_number(str);
773 sprintf(buf, "/proc/%d/pagemap", opt_pid);
774 pagemap_fd = checked_open(buf, O_RDONLY);
776 sprintf(buf, "/proc/%d/maps", opt_pid);
777 file = fopen(buf, "r");
783 while (fgets(buf, sizeof(buf), file) != NULL) {
784 unsigned long vm_start;
785 unsigned long vm_end;
786 unsigned long long pgoff;
792 n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu",
800 fprintf(stderr, "unexpected line: %s\n", buf);
803 pg_start[nr_vmas] = vm_start / page_size;
804 pg_end[nr_vmas] = vm_end / page_size;
805 if (++nr_vmas >= MAX_VMAS) {
806 fprintf(stderr, "too many VMAs\n");
813 static void show_file(const char *name, const struct stat *st)
815 unsigned long long size = st->st_size;
816 char atime[64], mtime[64];
817 long now = time(NULL);
819 printf("%s\tInode: %u\tSize: %llu (%llu pages)\n",
820 name, (unsigned)st->st_ino,
821 size, (size + page_size - 1) / page_size);
823 strftime(atime, sizeof(atime), "%c", localtime(&st->st_atime));
824 strftime(mtime, sizeof(mtime), "%c", localtime(&st->st_mtime));
826 printf("Modify: %s (%ld seconds ago)\nAccess: %s (%ld seconds ago)\n",
827 mtime, now - st->st_mtime,
828 atime, now - st->st_atime);
831 static sigjmp_buf sigbus_jmp;
833 static void * volatile sigbus_addr;
835 static void sigbus_handler(int sig, siginfo_t *info, void *ucontex)
839 sigbus_addr = info ? info->si_addr : NULL;
840 siglongjmp(sigbus_jmp, 1);
843 static struct sigaction sigbus_action = {
844 .sa_sigaction = sigbus_handler,
845 .sa_flags = SA_SIGINFO,
848 static void walk_file(const char *name, const struct stat *st)
850 uint8_t vec[PAGEMAP_BATCH];
851 uint64_t buf[PAGEMAP_BATCH], flags;
852 unsigned long nr_pages, pfn, i;
853 off_t off, end = st->st_size;
859 fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW);
861 for (off = 0; off < end; off += len) {
862 nr_pages = (end - off + page_size - 1) / page_size;
863 if (nr_pages > PAGEMAP_BATCH)
864 nr_pages = PAGEMAP_BATCH;
865 len = nr_pages * page_size;
867 ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, off);
868 if (ptr == MAP_FAILED)
869 fatal("mmap failed: %s", name);
871 /* determine cached pages */
872 if (mincore(ptr, len, vec))
873 fatal("mincore failed: %s", name);
875 /* turn off readahead */
876 if (madvise(ptr, len, MADV_RANDOM))
877 fatal("madvice failed: %s", name);
879 if (sigsetjmp(sigbus_jmp, 1)) {
880 end = off + sigbus_addr ? sigbus_addr - ptr : 0;
881 fprintf(stderr, "got sigbus at offset %lld: %s\n",
882 (long long)end, name);
887 for (i = 0; i < nr_pages ; i++) {
889 (void)*(volatile int *)(ptr + i * page_size);
893 /* turn off harvesting reference bits */
894 if (madvise(ptr, len, MADV_SEQUENTIAL))
895 fatal("madvice failed: %s", name);
897 if (pagemap_read(buf, (unsigned long)ptr / page_size,
898 nr_pages) != nr_pages)
899 fatal("cannot read pagemap");
903 for (i = 0; i < nr_pages; i++) {
904 pfn = pagemap_pfn(buf[i]);
907 if (!kpageflags_read(&flags, pfn, 1))
909 if (first && opt_list) {
914 add_page(off / page_size + i, pfn, flags, buf[i]);
921 int walk_tree(const char *name, const struct stat *st, int type, struct FTW *f)
926 if (S_ISREG(st->st_mode))
930 fprintf(stderr, "cannot read dir: %s\n", name);
936 static void walk_page_cache(void)
940 kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY);
941 pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY);
942 sigaction(SIGBUS, &sigbus_action, NULL);
944 if (stat(opt_file, &st))
945 fatal("stat failed: %s\n", opt_file);
947 if (S_ISREG(st.st_mode)) {
948 walk_file(opt_file, &st);
949 } else if (S_ISDIR(st.st_mode)) {
950 /* do not follow symlinks and mountpoints */
951 if (nftw(opt_file, walk_tree, 64, FTW_MOUNT | FTW_PHYS) < 0)
952 fatal("nftw failed: %s\n", opt_file);
954 fatal("unhandled file type: %s\n", opt_file);
956 close(kpageflags_fd);
958 signal(SIGBUS, SIG_DFL);
961 static void parse_file(const char *name)
966 static void parse_addr_range(const char *optarg)
968 unsigned long offset;
972 p = strchr(optarg, ',');
974 p = strchr(optarg, '+');
978 size = parse_number(p + 1);
980 offset = parse_number(optarg);
984 size = parse_number(p + 1);
987 fatal("invalid range: %lu,%lu\n",
993 offset = parse_number(optarg);
997 add_addr_range(offset, size);
1000 static void add_bits_filter(uint64_t mask, uint64_t bits)
1002 if (nr_bit_filters >= MAX_BIT_FILTERS)
1003 fatal("too much bit filters\n");
1005 opt_mask[nr_bit_filters] = mask;
1006 opt_bits[nr_bit_filters] = bits;
1010 static uint64_t parse_flag_name(const char *str, int len)
1017 if (len <= 8 && !strncmp(str, "compound", len))
1018 return BITS_COMPOUND;
1020 for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) {
1021 if (!page_flag_names[i])
1023 if (!strncmp(str, page_flag_names[i] + 2, len))
1027 return parse_number(str);
1030 static uint64_t parse_flag_names(const char *str, int all)
1032 const char *p = str;
1036 if (*p == ',' || *p == '=' || *p == '\0') {
1037 if ((*str != '~') || (*str == '~' && all && *++str))
1038 flags |= parse_flag_name(str, p - str);
1049 static void parse_bits_mask(const char *optarg)
1055 p = strchr(optarg, '=');
1057 mask = KPF_ALL_BITS;
1058 bits = parse_flag_names(p + 1, 0);
1060 mask = parse_flag_names(optarg, 0);
1061 bits = parse_flag_names(p + 1, 0);
1062 } else if (strchr(optarg, '~')) {
1063 mask = parse_flag_names(optarg, 1);
1064 bits = parse_flag_names(optarg, 0);
1066 mask = parse_flag_names(optarg, 0);
1067 bits = KPF_ALL_BITS;
1070 add_bits_filter(mask, bits);
1073 static void describe_flags(const char *optarg)
1075 uint64_t flags = parse_flag_names(optarg, 0);
1077 printf("0x%016llx\t%s\t%s\n",
1078 (unsigned long long)flags,
1079 page_flag_name(flags),
1080 page_flag_longname(flags));
1083 static const struct option opts[] = {
1084 { "raw" , 0, NULL, 'r' },
1085 { "pid" , 1, NULL, 'p' },
1086 { "file" , 1, NULL, 'f' },
1087 { "addr" , 1, NULL, 'a' },
1088 { "bits" , 1, NULL, 'b' },
1089 { "describe" , 1, NULL, 'd' },
1090 { "list" , 0, NULL, 'l' },
1091 { "list-each" , 0, NULL, 'L' },
1092 { "no-summary", 0, NULL, 'N' },
1093 { "hwpoison" , 0, NULL, 'X' },
1094 { "unpoison" , 0, NULL, 'x' },
1095 { "help" , 0, NULL, 'h' },
1096 { NULL , 0, NULL, 0 }
1099 int main(int argc, char *argv[])
1103 page_size = getpagesize();
1105 while ((c = getopt_long(argc, argv,
1106 "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
1118 parse_addr_range(optarg);
1121 parse_bits_mask(optarg);
1124 describe_flags(optarg);
1137 prepare_hwpoison_fd();
1141 prepare_hwpoison_fd();
1152 if (opt_list && opt_pid)
1153 printf("voffset\t");
1154 if (opt_list && opt_file)
1155 printf("foffset\t");
1157 printf("offset\tlen\tflags\n");
1159 printf("offset\tflags\n");