| /* |
| * page-types: Tool for querying page flags |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; version 2. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should find a copy of v2 of the GNU General Public License somewhere on |
| * your Linux system; if not, write to the Free Software Foundation, Inc., 59 |
| * Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| * |
| * Copyright (C) 2009 Intel corporation |
| * |
| * Authors: Wu Fengguang <fengguang.wu@intel.com> |
| */ |
| |
| #define _FILE_OFFSET_BITS 64 |
| #define _GNU_SOURCE |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <stdint.h> |
| #include <stdarg.h> |
| #include <string.h> |
| #include <getopt.h> |
| #include <limits.h> |
| #include <assert.h> |
| #include <ftw.h> |
| #include <time.h> |
| #include <setjmp.h> |
| #include <signal.h> |
| #include <sys/types.h> |
| #include <sys/errno.h> |
| #include <sys/fcntl.h> |
| #include <sys/mount.h> |
| #include <sys/statfs.h> |
| #include <sys/mman.h> |
| #include "../../include/uapi/linux/magic.h" |
| #include "../../include/uapi/linux/kernel-page-flags.h" |
| #include <api/fs/fs.h> |
| |
| #ifndef MAX_PATH |
| # define MAX_PATH 256 |
| #endif |
| |
| #ifndef STR |
| # define _STR(x) #x |
| # define STR(x) _STR(x) |
| #endif |
| |
| /* |
| * pagemap kernel ABI bits |
| */ |
| |
| #define PM_ENTRY_BYTES 8 |
| #define PM_PFRAME_BITS 55 |
| #define PM_PFRAME_MASK ((1LL << PM_PFRAME_BITS) - 1) |
| #define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) |
| #define MAX_SWAPFILES_SHIFT 5 |
| #define PM_SWAP_OFFSET(x) (((x) & PM_PFRAME_MASK) >> MAX_SWAPFILES_SHIFT) |
| #define PM_SOFT_DIRTY (1ULL << 55) |
| #define PM_MMAP_EXCLUSIVE (1ULL << 56) |
| #define PM_FILE (1ULL << 61) |
| #define PM_SWAP (1ULL << 62) |
| #define PM_PRESENT (1ULL << 63) |
| |
| /* |
| * kernel page flags |
| */ |
| |
| #define KPF_BYTES 8 |
| #define PROC_KPAGEFLAGS "/proc/kpageflags" |
| #define PROC_KPAGECGROUP "/proc/kpagecgroup" |
| |
| /* [32-] kernel hacking assistances */ |
| #define KPF_RESERVED 32 |
| #define KPF_MLOCKED 33 |
| #define KPF_MAPPEDTODISK 34 |
| #define KPF_PRIVATE 35 |
| #define KPF_PRIVATE_2 36 |
| #define KPF_OWNER_PRIVATE 37 |
| #define KPF_ARCH 38 |
| #define KPF_UNCACHED 39 |
| #define KPF_SOFTDIRTY 40 |
| |
| /* [48-] take some arbitrary free slots for expanding overloaded flags |
| * not part of kernel API |
| */ |
| #define KPF_READAHEAD 48 |
| #define KPF_SLOB_FREE 49 |
| #define KPF_SLUB_FROZEN 50 |
| #define KPF_SLUB_DEBUG 51 |
| #define KPF_FILE 61 |
| #define KPF_SWAP 62 |
| #define KPF_MMAP_EXCLUSIVE 63 |
| |
| #define KPF_ALL_BITS ((uint64_t)~0ULL) |
| #define KPF_HACKERS_BITS (0xffffULL << 32) |
| #define KPF_OVERLOADED_BITS (0xffffULL << 48) |
| #define BIT(name) (1ULL << KPF_##name) |
| #define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL)) |
| |
| static const char * const page_flag_names[] = { |
| [KPF_LOCKED] = "L:locked", |
| [KPF_ERROR] = "E:error", |
| [KPF_REFERENCED] = "R:referenced", |
| [KPF_UPTODATE] = "U:uptodate", |
| [KPF_DIRTY] = "D:dirty", |
| [KPF_LRU] = "l:lru", |
| [KPF_ACTIVE] = "A:active", |
| [KPF_SLAB] = "S:slab", |
| [KPF_WRITEBACK] = "W:writeback", |
| [KPF_RECLAIM] = "I:reclaim", |
| [KPF_BUDDY] = "B:buddy", |
| |
| [KPF_MMAP] = "M:mmap", |
| [KPF_ANON] = "a:anonymous", |
| [KPF_SWAPCACHE] = "s:swapcache", |
| [KPF_SWAPBACKED] = "b:swapbacked", |
| [KPF_COMPOUND_HEAD] = "H:compound_head", |
| [KPF_COMPOUND_TAIL] = "T:compound_tail", |
| [KPF_HUGE] = "G:huge", |
| [KPF_UNEVICTABLE] = "u:unevictable", |
| [KPF_HWPOISON] = "X:hwpoison", |
| [KPF_NOPAGE] = "n:nopage", |
| [KPF_KSM] = "x:ksm", |
| [KPF_THP] = "t:thp", |
| [KPF_BALLOON] = "o:balloon", |
| [KPF_ZERO_PAGE] = "z:zero_page", |
| [KPF_IDLE] = "i:idle_page", |
| |
| [KPF_RESERVED] = "r:reserved", |
| [KPF_MLOCKED] = "m:mlocked", |
| [KPF_MAPPEDTODISK] = "d:mappedtodisk", |
| [KPF_PRIVATE] = "P:private", |
| [KPF_PRIVATE_2] = "p:private_2", |
| [KPF_OWNER_PRIVATE] = "O:owner_private", |
| [KPF_ARCH] = "h:arch", |
| [KPF_UNCACHED] = "c:uncached", |
| [KPF_SOFTDIRTY] = "f:softdirty", |
| |
| [KPF_READAHEAD] = "I:readahead", |
| [KPF_SLOB_FREE] = "P:slob_free", |
| [KPF_SLUB_FROZEN] = "A:slub_frozen", |
| [KPF_SLUB_DEBUG] = "E:slub_debug", |
| |
| [KPF_FILE] = "F:file", |
| [KPF_SWAP] = "w:swap", |
| [KPF_MMAP_EXCLUSIVE] = "1:mmap_exclusive", |
| }; |
| |
| |
| /* |
| * data structures |
| */ |
| |
| static int opt_raw; /* for kernel developers */ |
| static int opt_list; /* list pages (in ranges) */ |
| static int opt_no_summary; /* don't show summary */ |
| static pid_t opt_pid; /* process to walk */ |
| const char * opt_file; /* file or directory path */ |
| static uint64_t opt_cgroup; /* cgroup inode */ |
| static int opt_list_cgroup;/* list page cgroup */ |
| |
| #define MAX_ADDR_RANGES 1024 |
| static int nr_addr_ranges; |
| static unsigned long opt_offset[MAX_ADDR_RANGES]; |
| static unsigned long opt_size[MAX_ADDR_RANGES]; |
| |
| #define MAX_VMAS 10240 |
| static int nr_vmas; |
| static unsigned long pg_start[MAX_VMAS]; |
| static unsigned long pg_end[MAX_VMAS]; |
| |
| #define MAX_BIT_FILTERS 64 |
| static int nr_bit_filters; |
| static uint64_t opt_mask[MAX_BIT_FILTERS]; |
| static uint64_t opt_bits[MAX_BIT_FILTERS]; |
| |
| static int page_size; |
| |
| static int pagemap_fd; |
| static int kpageflags_fd; |
| static int kpagecgroup_fd = -1; |
| |
| static int opt_hwpoison; |
| static int opt_unpoison; |
| |
| static const char *hwpoison_debug_fs; |
| static int hwpoison_inject_fd; |
| static int hwpoison_forget_fd; |
| |
| #define HASH_SHIFT 13 |
| #define HASH_SIZE (1 << HASH_SHIFT) |
| #define HASH_MASK (HASH_SIZE - 1) |
| #define HASH_KEY(flags) (flags & HASH_MASK) |
| |
| static unsigned long total_pages; |
| static unsigned long nr_pages[HASH_SIZE]; |
| static uint64_t page_flags[HASH_SIZE]; |
| |
| |
| /* |
| * helper functions |
| */ |
| |
| #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
| |
| #define min_t(type, x, y) ({ \ |
| type __min1 = (x); \ |
| type __min2 = (y); \ |
| __min1 < __min2 ? __min1 : __min2; }) |
| |
| #define max_t(type, x, y) ({ \ |
| type __max1 = (x); \ |
| type __max2 = (y); \ |
| __max1 > __max2 ? __max1 : __max2; }) |
| |
| static unsigned long pages2mb(unsigned long pages) |
| { |
| return (pages * page_size) >> 20; |
| } |
| |
| static void fatal(const char *x, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, x); |
| vfprintf(stderr, x, ap); |
| va_end(ap); |
| exit(EXIT_FAILURE); |
| } |
| |
| static int checked_open(const char *pathname, int flags) |
| { |
| int fd = open(pathname, flags); |
| |
| if (fd < 0) { |
| perror(pathname); |
| exit(EXIT_FAILURE); |
| } |
| |
| return fd; |
| } |
| |
| /* |
| * pagemap/kpageflags routines |
| */ |
| |
| static unsigned long do_u64_read(int fd, char *name, |
| uint64_t *buf, |
| unsigned long index, |
| unsigned long count) |
| { |
| long bytes; |
| |
| if (index > ULONG_MAX / 8) |
| fatal("index overflow: %lu\n", index); |
| |
| bytes = pread(fd, buf, count * 8, (off_t)index * 8); |
| if (bytes < 0) { |
| perror(name); |
| exit(EXIT_FAILURE); |
| } |
| if (bytes % 8) |
| fatal("partial read: %lu bytes\n", bytes); |
| |
| return bytes / 8; |
| } |
| |
| static unsigned long kpageflags_read(uint64_t *buf, |
| unsigned long index, |
| unsigned long pages) |
| { |
| return do_u64_read(kpageflags_fd, PROC_KPAGEFLAGS, buf, index, pages); |
| } |
| |
| static unsigned long kpagecgroup_read(uint64_t *buf, |
| unsigned long index, |
| unsigned long pages) |
| { |
| if (kpagecgroup_fd < 0) |
| return pages; |
| |
| return do_u64_read(kpagecgroup_fd, PROC_KPAGEFLAGS, buf, index, pages); |
| } |
| |
| static unsigned long pagemap_read(uint64_t *buf, |
| unsigned long index, |
| unsigned long pages) |
| { |
| return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages); |
| } |
| |
| static unsigned long pagemap_pfn(uint64_t val) |
| { |
| unsigned long pfn; |
| |
| if (val & PM_PRESENT) |
| pfn = PM_PFRAME(val); |
| else |
| pfn = 0; |
| |
| return pfn; |
| } |
| |
| static unsigned long pagemap_swap_offset(uint64_t val) |
| { |
| return val & PM_SWAP ? PM_SWAP_OFFSET(val) : 0; |
| } |
| |
| /* |
| * page flag names |
| */ |
| |
| static char *page_flag_name(uint64_t flags) |
| { |
| static char buf[65]; |
| int present; |
| size_t i, j; |
| |
| for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
| present = (flags >> i) & 1; |
| if (!page_flag_names[i]) { |
| if (present) |
| fatal("unknown flag bit %d\n", i); |
| continue; |
| } |
| buf[j++] = present ? page_flag_names[i][0] : '_'; |
| } |
| |
| return buf; |
| } |
| |
| static char *page_flag_longname(uint64_t flags) |
| { |
| static char buf[1024]; |
| size_t i, n; |
| |
| for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
| if (!page_flag_names[i]) |
| continue; |
| if ((flags >> i) & 1) |
| n += snprintf(buf + n, sizeof(buf) - n, "%s,", |
| page_flag_names[i] + 2); |
| } |
| if (n) |
| n--; |
| buf[n] = '\0'; |
| |
| return buf; |
| } |
| |
| |
| /* |
| * page list and summary |
| */ |
| |
| static void show_page_range(unsigned long voffset, unsigned long offset, |
| unsigned long size, uint64_t flags, uint64_t cgroup) |
| { |
| static uint64_t flags0; |
| static uint64_t cgroup0; |
| static unsigned long voff; |
| static unsigned long index; |
| static unsigned long count; |
| |
| if (flags == flags0 && cgroup == cgroup0 && offset == index + count && |
| size && voffset == voff + count) { |
| count += size; |
| return; |
| } |
| |
| if (count) { |
| if (opt_pid) |
| printf("%lx\t", voff); |
| if (opt_file) |
| printf("%lu\t", voff); |
| if (opt_list_cgroup) |
| printf("@%llu\t", (unsigned long long)cgroup0); |
| printf("%lx\t%lx\t%s\n", |
| index, count, page_flag_name(flags0)); |
| } |
| |
| flags0 = flags; |
| cgroup0= cgroup; |
| index = offset; |
| voff = voffset; |
| count = size; |
| } |
| |
| static void flush_page_range(void) |
| { |
| show_page_range(0, 0, 0, 0, 0); |
| } |
| |
| static void show_page(unsigned long voffset, unsigned long offset, |
| uint64_t flags, uint64_t cgroup) |
| { |
| if (opt_pid) |
| printf("%lx\t", voffset); |
| if (opt_file) |
| printf("%lu\t", voffset); |
| if (opt_list_cgroup) |
| printf("@%llu\t", (unsigned long long)cgroup); |
| printf("%lx\t%s\n", offset, page_flag_name(flags)); |
| } |
| |
| static void show_summary(void) |
| { |
| size_t i; |
| |
| printf(" flags\tpage-count MB" |
| " symbolic-flags\t\t\tlong-symbolic-flags\n"); |
| |
| for (i = 0; i < ARRAY_SIZE(nr_pages); i++) { |
| if (nr_pages[i]) |
| printf("0x%016llx\t%10lu %8lu %s\t%s\n", |
| (unsigned long long)page_flags[i], |
| nr_pages[i], |
| pages2mb(nr_pages[i]), |
| page_flag_name(page_flags[i]), |
| page_flag_longname(page_flags[i])); |
| } |
| |
| printf(" total\t%10lu %8lu\n", |
| total_pages, pages2mb(total_pages)); |
| } |
| |
| |
| /* |
| * page flag filters |
| */ |
| |
| static int bit_mask_ok(uint64_t flags) |
| { |
| int i; |
| |
| for (i = 0; i < nr_bit_filters; i++) { |
| if (opt_bits[i] == KPF_ALL_BITS) { |
| if ((flags & opt_mask[i]) == 0) |
| return 0; |
| } else { |
| if ((flags & opt_mask[i]) != opt_bits[i]) |
| return 0; |
| } |
| } |
| |
| return 1; |
| } |
| |
| static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme) |
| { |
| /* SLOB/SLUB overload several page flags */ |
| if (flags & BIT(SLAB)) { |
| if (flags & BIT(PRIVATE)) |
| flags ^= BIT(PRIVATE) | BIT(SLOB_FREE); |
| if (flags & BIT(ACTIVE)) |
| flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN); |
| if (flags & BIT(ERROR)) |
| flags ^= BIT(ERROR) | BIT(SLUB_DEBUG); |
| } |
| |
| /* PG_reclaim is overloaded as PG_readahead in the read path */ |
| if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM)) |
| flags ^= BIT(RECLAIM) | BIT(READAHEAD); |
| |
| if (pme & PM_SOFT_DIRTY) |
| flags |= BIT(SOFTDIRTY); |
| if (pme & PM_FILE) |
| flags |= BIT(FILE); |
| if (pme & PM_SWAP) |
| flags |= BIT(SWAP); |
| if (pme & PM_MMAP_EXCLUSIVE) |
| flags |= BIT(MMAP_EXCLUSIVE); |
| |
| return flags; |
| } |
| |
| static uint64_t well_known_flags(uint64_t flags) |
| { |
| /* hide flags intended only for kernel hacker */ |
| flags &= ~KPF_HACKERS_BITS; |
| |
| /* hide non-hugeTLB compound pages */ |
| if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE))) |
| flags &= ~BITS_COMPOUND; |
| |
| return flags; |
| } |
| |
| static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme) |
| { |
| if (opt_raw) |
| flags = expand_overloaded_flags(flags, pme); |
| else |
| flags = well_known_flags(flags); |
| |
| return flags; |
| } |
| |
| /* |
| * page actions |
| */ |
| |
| static void prepare_hwpoison_fd(void) |
| { |
| char buf[MAX_PATH + 1]; |
| |
| hwpoison_debug_fs = debugfs__mount(); |
| if (!hwpoison_debug_fs) { |
| perror("mount debugfs"); |
| exit(EXIT_FAILURE); |
| } |
| |
| if (opt_hwpoison && !hwpoison_inject_fd) { |
| snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn", |
| hwpoison_debug_fs); |
| hwpoison_inject_fd = checked_open(buf, O_WRONLY); |
| } |
| |
| if (opt_unpoison && !hwpoison_forget_fd) { |
| snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn", |
| hwpoison_debug_fs); |
| hwpoison_forget_fd = checked_open(buf, O_WRONLY); |
| } |
| } |
| |
| static int hwpoison_page(unsigned long offset) |
| { |
| char buf[100]; |
| int len; |
| |
| len = sprintf(buf, "0x%lx\n", offset); |
| len = write(hwpoison_inject_fd, buf, len); |
| if (len < 0) { |
| perror("hwpoison inject"); |
| return len; |
| } |
| return 0; |
| } |
| |
| static int unpoison_page(unsigned long offset) |
| { |
| char buf[100]; |
| int len; |
| |
| len = sprintf(buf, "0x%lx\n", offset); |
| len = write(hwpoison_forget_fd, buf, len); |
| if (len < 0) { |
| perror("hwpoison forget"); |
| return len; |
| } |
| return 0; |
| } |
| |
| /* |
| * page frame walker |
| */ |
| |
| static size_t hash_slot(uint64_t flags) |
| { |
| size_t k = HASH_KEY(flags); |
| size_t i; |
| |
| /* Explicitly reserve slot 0 for flags 0: the following logic |
| * cannot distinguish an unoccupied slot from slot (flags==0). |
| */ |
| if (flags == 0) |
| return 0; |
| |
| /* search through the remaining (HASH_SIZE-1) slots */ |
| for (i = 1; i < ARRAY_SIZE(page_flags); i++, k++) { |
| if (!k || k >= ARRAY_SIZE(page_flags)) |
| k = 1; |
| if (page_flags[k] == 0) { |
| page_flags[k] = flags; |
| return k; |
| } |
| if (page_flags[k] == flags) |
| return k; |
| } |
| |
| fatal("hash table full: bump up HASH_SHIFT?\n"); |
| exit(EXIT_FAILURE); |
| } |
| |
| static void add_page(unsigned long voffset, unsigned long offset, |
| uint64_t flags, uint64_t cgroup, uint64_t pme) |
| { |
| flags = kpageflags_flags(flags, pme); |
| |
| if (!bit_mask_ok(flags)) |
| return; |
| |
| if (opt_cgroup && cgroup != (uint64_t)opt_cgroup) |
| return; |
| |
| if (opt_hwpoison) |
| hwpoison_page(offset); |
| if (opt_unpoison) |
| unpoison_page(offset); |
| |
| if (opt_list == 1) |
| show_page_range(voffset, offset, 1, flags, cgroup); |
| else if (opt_list == 2) |
| show_page(voffset, offset, flags, cgroup); |
| |
| nr_pages[hash_slot(flags)]++; |
| total_pages++; |
| } |
| |
| #define KPAGEFLAGS_BATCH (64 << 10) /* 64k pages */ |
| static void walk_pfn(unsigned long voffset, |
| unsigned long index, |
| unsigned long count, |
| uint64_t pme) |
| { |
| uint64_t buf[KPAGEFLAGS_BATCH]; |
| uint64_t cgi[KPAGEFLAGS_BATCH]; |
| unsigned long batch; |
| unsigned long pages; |
| unsigned long i; |
| |
| /* |
| * kpagecgroup_read() reads only if kpagecgroup were opened, but |
| * /proc/kpagecgroup might even not exist, so it's better to fill |
| * them with zeros here. |
| */ |
| if (count == 1) |
| cgi[0] = 0; |
| else |
| memset(cgi, 0, sizeof cgi); |
| |
| while (count) { |
| batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH); |
| pages = kpageflags_read(buf, index, batch); |
| if (pages == 0) |
| break; |
| |
| if (kpagecgroup_read(cgi, index, pages) != pages) |
| fatal("kpagecgroup returned fewer pages than expected"); |
| |
| for (i = 0; i < pages; i++) |
| add_page(voffset + i, index + i, buf[i], cgi[i], pme); |
| |
| index += pages; |
| count -= pages; |
| } |
| } |
| |
| static void walk_swap(unsigned long voffset, uint64_t pme) |
| { |
| uint64_t flags = kpageflags_flags(0, pme); |
| |
| if (!bit_mask_ok(flags)) |
| return; |
| |
| if (opt_cgroup) |
| return; |
| |
| if (opt_list == 1) |
| show_page_range(voffset, pagemap_swap_offset(pme), 1, flags, 0); |
| else if (opt_list == 2) |
| show_page(voffset, pagemap_swap_offset(pme), flags, 0); |
| |
| nr_pages[hash_slot(flags)]++; |
| total_pages++; |
| } |
| |
| #define PAGEMAP_BATCH (64 << 10) |
| static void walk_vma(unsigned long index, unsigned long count) |
| { |
| uint64_t buf[PAGEMAP_BATCH]; |
| unsigned long batch; |
| unsigned long pages; |
| unsigned long pfn; |
| unsigned long i; |
| |
| while (count) { |
| batch = min_t(unsigned long, count, PAGEMAP_BATCH); |
| pages = pagemap_read(buf, index, batch); |
| if (pages == 0) |
| break; |
| |
| for (i = 0; i < pages; i++) { |
| pfn = pagemap_pfn(buf[i]); |
| if (pfn) |
| walk_pfn(index + i, pfn, 1, buf[i]); |
| if (buf[i] & PM_SWAP) |
| walk_swap(index + i, buf[i]); |
| } |
| |
| index += pages; |
| count -= pages; |
| } |
| } |
| |
| static void walk_task(unsigned long index, unsigned long count) |
| { |
| const unsigned long end = index + count; |
| unsigned long start; |
| int i = 0; |
| |
| while (index < end) { |
| |
| while (pg_end[i] <= index) |
| if (++i >= nr_vmas) |
| return; |
| if (pg_start[i] >= end) |
| return; |
| |
| start = max_t(unsigned long, pg_start[i], index); |
| index = min_t(unsigned long, pg_end[i], end); |
| |
| assert(start < index); |
| walk_vma(start, index - start); |
| } |
| } |
| |
| static void add_addr_range(unsigned long offset, unsigned long size) |
| { |
| if (nr_addr_ranges >= MAX_ADDR_RANGES) |
| fatal("too many addr ranges\n"); |
| |
| opt_offset[nr_addr_ranges] = offset; |
| opt_size[nr_addr_ranges] = min_t(unsigned long, size, ULONG_MAX-offset); |
| nr_addr_ranges++; |
| } |
| |
| static void walk_addr_ranges(void) |
| { |
| int i; |
| |
| kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY); |
| |
| if (!nr_addr_ranges) |
| add_addr_range(0, ULONG_MAX); |
| |
| for (i = 0; i < nr_addr_ranges; i++) |
| if (!opt_pid) |
| walk_pfn(opt_offset[i], opt_offset[i], opt_size[i], 0); |
| else |
| walk_task(opt_offset[i], opt_size[i]); |
| |
| close(kpageflags_fd); |
| } |
| |
| |
| /* |
| * user interface |
| */ |
| |
| static const char *page_flag_type(uint64_t flag) |
| { |
| if (flag & KPF_HACKERS_BITS) |
| return "(r)"; |
| if (flag & KPF_OVERLOADED_BITS) |
| return "(o)"; |
| return " "; |
| } |
| |
| static void usage(void) |
| { |
| size_t i, j; |
| |
| printf( |
| "page-types [options]\n" |
| " -r|--raw Raw mode, for kernel developers\n" |
| " -d|--describe flags Describe flags\n" |
| " -a|--addr addr-spec Walk a range of pages\n" |
| " -b|--bits bits-spec Walk pages with specified bits\n" |
| " -c|--cgroup path|@inode Walk pages within memory cgroup\n" |
| " -p|--pid pid Walk process address space\n" |
| " -f|--file filename Walk file address space\n" |
| " -l|--list Show page details in ranges\n" |
| " -L|--list-each Show page details one by one\n" |
| " -C|--list-cgroup Show cgroup inode for pages\n" |
| " -N|--no-summary Don't show summary info\n" |
| " -X|--hwpoison hwpoison pages\n" |
| " -x|--unpoison unpoison pages\n" |
| " -h|--help Show this usage message\n" |
| "flags:\n" |
| " 0x10 bitfield format, e.g.\n" |
| " anon bit-name, e.g.\n" |
| " 0x10,anon comma-separated list, e.g.\n" |
| "addr-spec:\n" |
| " N one page at offset N (unit: pages)\n" |
| " N+M pages range from N to N+M-1\n" |
| " N,M pages range from N to M-1\n" |
| " N, pages range from N to end\n" |
| " ,M pages range from 0 to M-1\n" |
| "bits-spec:\n" |
| " bit1,bit2 (flags & (bit1|bit2)) != 0\n" |
| " bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n" |
| " bit1,~bit2 (flags & (bit1|bit2)) == bit1\n" |
| " =bit1,bit2 flags == (bit1|bit2)\n" |
| "bit-names:\n" |
| ); |
| |
| for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
| if (!page_flag_names[i]) |
| continue; |
| printf("%16s%s", page_flag_names[i] + 2, |
| page_flag_type(1ULL << i)); |
| if (++j > 3) { |
| j = 0; |
| putchar('\n'); |
| } |
| } |
| printf("\n " |
| "(r) raw mode bits (o) overloaded bits\n"); |
| } |
| |
| static unsigned long long parse_number(const char *str) |
| { |
| unsigned long long n; |
| |
| n = strtoll(str, NULL, 0); |
| |
| if (n == 0 && str[0] != '0') |
| fatal("invalid name or number: %s\n", str); |
| |
| return n; |
| } |
| |
| static void parse_pid(const char *str) |
| { |
| FILE *file; |
| char buf[5000]; |
| |
| opt_pid = parse_number(str); |
| |
| sprintf(buf, "/proc/%d/pagemap", opt_pid); |
| pagemap_fd = checked_open(buf, O_RDONLY); |
| |
| sprintf(buf, "/proc/%d/maps", opt_pid); |
| file = fopen(buf, "r"); |
| if (!file) { |
| perror(buf); |
| exit(EXIT_FAILURE); |
| } |
| |
| while (fgets(buf, sizeof(buf), file) != NULL) { |
| unsigned long vm_start; |
| unsigned long vm_end; |
| unsigned long long pgoff; |
| int major, minor; |
| char r, w, x, s; |
| unsigned long ino; |
| int n; |
| |
| n = sscanf(buf, "%lx-%lx %c%c%c%c %llx %x:%x %lu", |
| &vm_start, |
| &vm_end, |
| &r, &w, &x, &s, |
| &pgoff, |
| &major, &minor, |
| &ino); |
| if (n < 10) { |
| fprintf(stderr, "unexpected line: %s\n", buf); |
| continue; |
| } |
| pg_start[nr_vmas] = vm_start / page_size; |
| pg_end[nr_vmas] = vm_end / page_size; |
| if (++nr_vmas >= MAX_VMAS) { |
| fprintf(stderr, "too many VMAs\n"); |
| break; |
| } |
| } |
| fclose(file); |
| } |
| |
| static void show_file(const char *name, const struct stat *st) |
| { |
| unsigned long long size = st->st_size; |
| char atime[64], mtime[64]; |
| long now = time(NULL); |
| |
| printf("%s\tInode: %u\tSize: %llu (%llu pages)\n", |
| name, (unsigned)st->st_ino, |
| size, (size + page_size - 1) / page_size); |
| |
| strftime(atime, sizeof(atime), "%c", localtime(&st->st_atime)); |
| strftime(mtime, sizeof(mtime), "%c", localtime(&st->st_mtime)); |
| |
| printf("Modify: %s (%ld seconds ago)\nAccess: %s (%ld seconds ago)\n", |
| mtime, now - st->st_mtime, |
| atime, now - st->st_atime); |
| } |
| |
| static sigjmp_buf sigbus_jmp; |
| |
| static void * volatile sigbus_addr; |
| |
| static void sigbus_handler(int sig, siginfo_t *info, void *ucontex) |
| { |
| (void)sig; |
| (void)ucontex; |
| sigbus_addr = info ? info->si_addr : NULL; |
| siglongjmp(sigbus_jmp, 1); |
| } |
| |
| static struct sigaction sigbus_action = { |
| .sa_sigaction = sigbus_handler, |
| .sa_flags = SA_SIGINFO, |
| }; |
| |
| static void walk_file(const char *name, const struct stat *st) |
| { |
| uint8_t vec[PAGEMAP_BATCH]; |
| uint64_t buf[PAGEMAP_BATCH], flags; |
| uint64_t cgroup = 0; |
| unsigned long nr_pages, pfn, i; |
| off_t off, end = st->st_size; |
| int fd; |
| ssize_t len; |
| void *ptr; |
| int first = 1; |
| |
| fd = checked_open(name, O_RDONLY|O_NOATIME|O_NOFOLLOW); |
| |
| for (off = 0; off < end; off += len) { |
| nr_pages = (end - off + page_size - 1) / page_size; |
| if (nr_pages > PAGEMAP_BATCH) |
| nr_pages = PAGEMAP_BATCH; |
| len = nr_pages * page_size; |
| |
| ptr = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, off); |
| if (ptr == MAP_FAILED) |
| fatal("mmap failed: %s", name); |
| |
| /* determine cached pages */ |
| if (mincore(ptr, len, vec)) |
| fatal("mincore failed: %s", name); |
| |
| /* turn off readahead */ |
| if (madvise(ptr, len, MADV_RANDOM)) |
| fatal("madvice failed: %s", name); |
| |
| if (sigsetjmp(sigbus_jmp, 1)) { |
| end = off + sigbus_addr ? sigbus_addr - ptr : 0; |
| fprintf(stderr, "got sigbus at offset %lld: %s\n", |
| (long long)end, name); |
| goto got_sigbus; |
| } |
| |
| /* populate ptes */ |
| for (i = 0; i < nr_pages ; i++) { |
| if (vec[i] & 1) |
| (void)*(volatile int *)(ptr + i * page_size); |
| } |
| got_sigbus: |
| |
| /* turn off harvesting reference bits */ |
| if (madvise(ptr, len, MADV_SEQUENTIAL)) |
| fatal("madvice failed: %s", name); |
| |
| if (pagemap_read(buf, (unsigned long)ptr / page_size, |
| nr_pages) != nr_pages) |
| fatal("cannot read pagemap"); |
| |
| munmap(ptr, len); |
| |
| for (i = 0; i < nr_pages; i++) { |
| pfn = pagemap_pfn(buf[i]); |
| if (!pfn) |
| continue; |
| if (!kpageflags_read(&flags, pfn, 1)) |
| continue; |
| if (!kpagecgroup_read(&cgroup, pfn, 1)) |
| fatal("kpagecgroup_read failed"); |
| if (first && opt_list) { |
| first = 0; |
| flush_page_range(); |
| show_file(name, st); |
| } |
| add_page(off / page_size + i, pfn, |
| flags, cgroup, buf[i]); |
| } |
| } |
| |
| close(fd); |
| } |
| |
| int walk_tree(const char *name, const struct stat *st, int type, struct FTW *f) |
| { |
| (void)f; |
| switch (type) { |
| case FTW_F: |
| if (S_ISREG(st->st_mode)) |
| walk_file(name, st); |
| break; |
| case FTW_DNR: |
| fprintf(stderr, "cannot read dir: %s\n", name); |
| break; |
| } |
| return 0; |
| } |
| |
| static void walk_page_cache(void) |
| { |
| struct stat st; |
| |
| kpageflags_fd = checked_open(PROC_KPAGEFLAGS, O_RDONLY); |
| pagemap_fd = checked_open("/proc/self/pagemap", O_RDONLY); |
| sigaction(SIGBUS, &sigbus_action, NULL); |
| |
| if (stat(opt_file, &st)) |
| fatal("stat failed: %s\n", opt_file); |
| |
| if (S_ISREG(st.st_mode)) { |
| walk_file(opt_file, &st); |
| } else if (S_ISDIR(st.st_mode)) { |
| /* do not follow symlinks and mountpoints */ |
| if (nftw(opt_file, walk_tree, 64, FTW_MOUNT | FTW_PHYS) < 0) |
| fatal("nftw failed: %s\n", opt_file); |
| } else |
| fatal("unhandled file type: %s\n", opt_file); |
| |
| close(kpageflags_fd); |
| close(pagemap_fd); |
| signal(SIGBUS, SIG_DFL); |
| } |
| |
| static void parse_file(const char *name) |
| { |
| opt_file = name; |
| } |
| |
| static void parse_cgroup(const char *path) |
| { |
| if (path[0] == '@') { |
| opt_cgroup = parse_number(path + 1); |
| return; |
| } |
| |
| struct stat st; |
| |
| if (stat(path, &st)) |
| fatal("stat failed: %s: %m\n", path); |
| |
| if (!S_ISDIR(st.st_mode)) |
| fatal("cgroup supposed to be a directory: %s\n", path); |
| |
| opt_cgroup = st.st_ino; |
| } |
| |
| static void parse_addr_range(const char *optarg) |
| { |
| unsigned long offset; |
| unsigned long size; |
| char *p; |
| |
| p = strchr(optarg, ','); |
| if (!p) |
| p = strchr(optarg, '+'); |
| |
| if (p == optarg) { |
| offset = 0; |
| size = parse_number(p + 1); |
| } else if (p) { |
| offset = parse_number(optarg); |
| if (p[1] == '\0') |
| size = ULONG_MAX; |
| else { |
| size = parse_number(p + 1); |
| if (*p == ',') { |
| if (size < offset) |
| fatal("invalid range: %lu,%lu\n", |
| offset, size); |
| size -= offset; |
| } |
| } |
| } else { |
| offset = parse_number(optarg); |
| size = 1; |
| } |
| |
| add_addr_range(offset, size); |
| } |
| |
| static void add_bits_filter(uint64_t mask, uint64_t bits) |
| { |
| if (nr_bit_filters >= MAX_BIT_FILTERS) |
| fatal("too much bit filters\n"); |
| |
| opt_mask[nr_bit_filters] = mask; |
| opt_bits[nr_bit_filters] = bits; |
| nr_bit_filters++; |
| } |
| |
| static uint64_t parse_flag_name(const char *str, int len) |
| { |
| size_t i; |
| |
| if (!*str || !len) |
| return 0; |
| |
| if (len <= 8 && !strncmp(str, "compound", len)) |
| return BITS_COMPOUND; |
| |
| for (i = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
| if (!page_flag_names[i]) |
| continue; |
| if (!strncmp(str, page_flag_names[i] + 2, len)) |
| return 1ULL << i; |
| } |
| |
| return parse_number(str); |
| } |
| |
| static uint64_t parse_flag_names(const char *str, int all) |
| { |
| const char *p = str; |
| uint64_t flags = 0; |
| |
| while (1) { |
| if (*p == ',' || *p == '=' || *p == '\0') { |
| if ((*str != '~') || (*str == '~' && all && *++str)) |
| flags |= parse_flag_name(str, p - str); |
| if (*p != ',') |
| break; |
| str = p + 1; |
| } |
| p++; |
| } |
| |
| return flags; |
| } |
| |
| static void parse_bits_mask(const char *optarg) |
| { |
| uint64_t mask; |
| uint64_t bits; |
| const char *p; |
| |
| p = strchr(optarg, '='); |
| if (p == optarg) { |
| mask = KPF_ALL_BITS; |
| bits = parse_flag_names(p + 1, 0); |
| } else if (p) { |
| mask = parse_flag_names(optarg, 0); |
| bits = parse_flag_names(p + 1, 0); |
| } else if (strchr(optarg, '~')) { |
| mask = parse_flag_names(optarg, 1); |
| bits = parse_flag_names(optarg, 0); |
| } else { |
| mask = parse_flag_names(optarg, 0); |
| bits = KPF_ALL_BITS; |
| } |
| |
| add_bits_filter(mask, bits); |
| } |
| |
| static void describe_flags(const char *optarg) |
| { |
| uint64_t flags = parse_flag_names(optarg, 0); |
| |
| printf("0x%016llx\t%s\t%s\n", |
| (unsigned long long)flags, |
| page_flag_name(flags), |
| page_flag_longname(flags)); |
| } |
| |
| static const struct option opts[] = { |
| { "raw" , 0, NULL, 'r' }, |
| { "pid" , 1, NULL, 'p' }, |
| { "file" , 1, NULL, 'f' }, |
| { "addr" , 1, NULL, 'a' }, |
| { "bits" , 1, NULL, 'b' }, |
| { "cgroup" , 1, NULL, 'c' }, |
| { "describe" , 1, NULL, 'd' }, |
| { "list" , 0, NULL, 'l' }, |
| { "list-each" , 0, NULL, 'L' }, |
| { "list-cgroup", 0, NULL, 'C' }, |
| { "no-summary", 0, NULL, 'N' }, |
| { "hwpoison" , 0, NULL, 'X' }, |
| { "unpoison" , 0, NULL, 'x' }, |
| { "help" , 0, NULL, 'h' }, |
| { NULL , 0, NULL, 0 } |
| }; |
| |
| int main(int argc, char *argv[]) |
| { |
| int c; |
| |
| page_size = getpagesize(); |
| |
| while ((c = getopt_long(argc, argv, |
| "rp:f:a:b:d:c:ClLNXxh", opts, NULL)) != -1) { |
| switch (c) { |
| case 'r': |
| opt_raw = 1; |
| break; |
| case 'p': |
| parse_pid(optarg); |
| break; |
| case 'f': |
| parse_file(optarg); |
| break; |
| case 'a': |
| parse_addr_range(optarg); |
| break; |
| case 'b': |
| parse_bits_mask(optarg); |
| break; |
| case 'c': |
| parse_cgroup(optarg); |
| break; |
| case 'C': |
| opt_list_cgroup = 1; |
| break; |
| case 'd': |
| describe_flags(optarg); |
| exit(0); |
| case 'l': |
| opt_list = 1; |
| break; |
| case 'L': |
| opt_list = 2; |
| break; |
| case 'N': |
| opt_no_summary = 1; |
| break; |
| case 'X': |
| opt_hwpoison = 1; |
| prepare_hwpoison_fd(); |
| break; |
| case 'x': |
| opt_unpoison = 1; |
| prepare_hwpoison_fd(); |
| break; |
| case 'h': |
| usage(); |
| exit(0); |
| default: |
| usage(); |
| exit(1); |
| } |
| } |
| |
| if (opt_cgroup || opt_list_cgroup) |
| kpagecgroup_fd = checked_open(PROC_KPAGECGROUP, O_RDONLY); |
| |
| if (opt_list && opt_pid) |
| printf("voffset\t"); |
| if (opt_list && opt_file) |
| printf("foffset\t"); |
| if (opt_list && opt_list_cgroup) |
| printf("cgroup\t"); |
| if (opt_list == 1) |
| printf("offset\tlen\tflags\n"); |
| if (opt_list == 2) |
| printf("offset\tflags\n"); |
| |
| if (opt_file) |
| walk_page_cache(); |
| else |
| walk_addr_ranges(); |
| |
| if (opt_list == 1) |
| flush_page_range(); |
| |
| if (opt_no_summary) |
| return 0; |
| |
| if (opt_list) |
| printf("\n\n"); |
| |
| show_summary(); |
| |
| return 0; |
| } |