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1374 lines
30 KiB
1374 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* page-types: Tool for querying page flags |
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* |
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* Copyright (C) 2009 Intel corporation |
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* |
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* Authors: Wu Fengguang <[email protected]> |
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*/ |
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#define _FILE_OFFSET_BITS 64 |
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#define _GNU_SOURCE |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <stdint.h> |
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#include <stdarg.h> |
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#include <string.h> |
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#include <getopt.h> |
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#include <limits.h> |
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#include <assert.h> |
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#include <ftw.h> |
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#include <time.h> |
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#include <setjmp.h> |
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#include <signal.h> |
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#include <sys/types.h> |
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#include <sys/errno.h> |
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#include <sys/fcntl.h> |
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#include <sys/mount.h> |
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#include <sys/statfs.h> |
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#include <sys/mman.h> |
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#include "../../include/uapi/linux/magic.h" |
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#include "../../include/uapi/linux/kernel-page-flags.h" |
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#include <api/fs/fs.h> |
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#ifndef MAX_PATH |
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# define MAX_PATH 256 |
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#endif |
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#ifndef STR |
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# define _STR(x) #x |
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# define STR(x) _STR(x) |
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#endif |
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/* |
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* pagemap kernel ABI bits |
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*/ |
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#define PM_ENTRY_BYTES 8 |
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#define PM_PFRAME_BITS 55 |
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#define PM_PFRAME_MASK ((1LL << PM_PFRAME_BITS) - 1) |
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#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK) |
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#define MAX_SWAPFILES_SHIFT 5 |
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#define PM_SWAP_OFFSET(x) (((x) & PM_PFRAME_MASK) >> MAX_SWAPFILES_SHIFT) |
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#define PM_SOFT_DIRTY (1ULL << 55) |
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#define PM_MMAP_EXCLUSIVE (1ULL << 56) |
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#define PM_FILE (1ULL << 61) |
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#define PM_SWAP (1ULL << 62) |
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#define PM_PRESENT (1ULL << 63) |
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/* |
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* kernel page flags |
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*/ |
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#define KPF_BYTES 8 |
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#define PROC_KPAGEFLAGS "/proc/kpageflags" |
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#define PROC_KPAGECOUNT "/proc/kpagecount" |
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#define PROC_KPAGECGROUP "/proc/kpagecgroup" |
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#define SYS_KERNEL_MM_PAGE_IDLE "/sys/kernel/mm/page_idle/bitmap" |
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/* [32-] kernel hacking assistances */ |
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#define KPF_RESERVED 32 |
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#define KPF_MLOCKED 33 |
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#define KPF_MAPPEDTODISK 34 |
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#define KPF_PRIVATE 35 |
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#define KPF_PRIVATE_2 36 |
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#define KPF_OWNER_PRIVATE 37 |
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#define KPF_ARCH 38 |
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#define KPF_UNCACHED 39 |
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#define KPF_SOFTDIRTY 40 |
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#define KPF_ARCH_2 41 |
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/* [48-] take some arbitrary free slots for expanding overloaded flags |
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* not part of kernel API |
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*/ |
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#define KPF_READAHEAD 48 |
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#define KPF_SLOB_FREE 49 |
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#define KPF_SLUB_FROZEN 50 |
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#define KPF_SLUB_DEBUG 51 |
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#define KPF_FILE 61 |
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#define KPF_SWAP 62 |
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#define KPF_MMAP_EXCLUSIVE 63 |
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#define KPF_ALL_BITS ((uint64_t)~0ULL) |
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#define KPF_HACKERS_BITS (0xffffULL << 32) |
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#define KPF_OVERLOADED_BITS (0xffffULL << 48) |
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#define BIT(name) (1ULL << KPF_##name) |
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#define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL)) |
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static const char * const page_flag_names[] = { |
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[KPF_LOCKED] = "L:locked", |
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[KPF_ERROR] = "E:error", |
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[KPF_REFERENCED] = "R:referenced", |
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[KPF_UPTODATE] = "U:uptodate", |
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[KPF_DIRTY] = "D:dirty", |
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[KPF_LRU] = "l:lru", |
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[KPF_ACTIVE] = "A:active", |
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[KPF_SLAB] = "S:slab", |
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[KPF_WRITEBACK] = "W:writeback", |
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[KPF_RECLAIM] = "I:reclaim", |
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[KPF_BUDDY] = "B:buddy", |
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[KPF_MMAP] = "M:mmap", |
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[KPF_ANON] = "a:anonymous", |
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[KPF_SWAPCACHE] = "s:swapcache", |
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[KPF_SWAPBACKED] = "b:swapbacked", |
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[KPF_COMPOUND_HEAD] = "H:compound_head", |
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[KPF_COMPOUND_TAIL] = "T:compound_tail", |
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[KPF_HUGE] = "G:huge", |
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[KPF_UNEVICTABLE] = "u:unevictable", |
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[KPF_HWPOISON] = "X:hwpoison", |
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[KPF_NOPAGE] = "n:nopage", |
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[KPF_KSM] = "x:ksm", |
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[KPF_THP] = "t:thp", |
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[KPF_OFFLINE] = "o:offline", |
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[KPF_PGTABLE] = "g:pgtable", |
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[KPF_ZERO_PAGE] = "z:zero_page", |
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[KPF_IDLE] = "i:idle_page", |
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[KPF_RESERVED] = "r:reserved", |
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[KPF_MLOCKED] = "m:mlocked", |
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[KPF_MAPPEDTODISK] = "d:mappedtodisk", |
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[KPF_PRIVATE] = "P:private", |
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[KPF_PRIVATE_2] = "p:private_2", |
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[KPF_OWNER_PRIVATE] = "O:owner_private", |
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[KPF_ARCH] = "h:arch", |
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[KPF_UNCACHED] = "c:uncached", |
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[KPF_SOFTDIRTY] = "f:softdirty", |
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[KPF_ARCH_2] = "H:arch_2", |
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[KPF_READAHEAD] = "I:readahead", |
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[KPF_SLOB_FREE] = "P:slob_free", |
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[KPF_SLUB_FROZEN] = "A:slub_frozen", |
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[KPF_SLUB_DEBUG] = "E:slub_debug", |
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[KPF_FILE] = "F:file", |
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[KPF_SWAP] = "w:swap", |
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[KPF_MMAP_EXCLUSIVE] = "1:mmap_exclusive", |
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}; |
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/* |
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* data structures |
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*/ |
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static int opt_raw; /* for kernel developers */ |
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static int opt_list; /* list pages (in ranges) */ |
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static int opt_mark_idle; /* set accessed bit */ |
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static int opt_no_summary; /* don't show summary */ |
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static pid_t opt_pid; /* process to walk */ |
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const char *opt_file; /* file or directory path */ |
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static uint64_t opt_cgroup; /* cgroup inode */ |
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static int opt_list_cgroup;/* list page cgroup */ |
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static int opt_list_mapcnt;/* list page map count */ |
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static const char *opt_kpageflags;/* kpageflags file to parse */ |
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#define MAX_ADDR_RANGES 1024 |
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static int nr_addr_ranges; |
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static unsigned long opt_offset[MAX_ADDR_RANGES]; |
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static unsigned long opt_size[MAX_ADDR_RANGES]; |
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#define MAX_VMAS 10240 |
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static int nr_vmas; |
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static unsigned long pg_start[MAX_VMAS]; |
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static unsigned long pg_end[MAX_VMAS]; |
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#define MAX_BIT_FILTERS 64 |
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static int nr_bit_filters; |
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static uint64_t opt_mask[MAX_BIT_FILTERS]; |
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static uint64_t opt_bits[MAX_BIT_FILTERS]; |
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static int page_size; |
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static int pagemap_fd; |
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static int kpageflags_fd; |
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static int kpagecount_fd = -1; |
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static int kpagecgroup_fd = -1; |
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static int page_idle_fd = -1; |
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static int opt_hwpoison; |
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static int opt_unpoison; |
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static const char *hwpoison_debug_fs; |
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static int hwpoison_inject_fd; |
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static int hwpoison_forget_fd; |
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#define HASH_SHIFT 13 |
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#define HASH_SIZE (1 << HASH_SHIFT) |
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#define HASH_MASK (HASH_SIZE - 1) |
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#define HASH_KEY(flags) (flags & HASH_MASK) |
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static unsigned long total_pages; |
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static unsigned long nr_pages[HASH_SIZE]; |
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static uint64_t page_flags[HASH_SIZE]; |
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/* |
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* helper functions |
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*/ |
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
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#define min_t(type, x, y) ({ \ |
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type __min1 = (x); \ |
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type __min2 = (y); \ |
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__min1 < __min2 ? __min1 : __min2; }) |
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#define max_t(type, x, y) ({ \ |
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type __max1 = (x); \ |
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type __max2 = (y); \ |
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__max1 > __max2 ? __max1 : __max2; }) |
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static unsigned long pages2mb(unsigned long pages) |
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{ |
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return (pages * page_size) >> 20; |
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} |
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static void fatal(const char *x, ...) |
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{ |
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va_list ap; |
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va_start(ap, x); |
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vfprintf(stderr, x, ap); |
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va_end(ap); |
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exit(EXIT_FAILURE); |
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} |
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static int checked_open(const char *pathname, int flags) |
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{ |
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int fd = open(pathname, flags); |
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if (fd < 0) { |
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perror(pathname); |
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exit(EXIT_FAILURE); |
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} |
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return fd; |
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} |
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/* |
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* pagemap/kpageflags routines |
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*/ |
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static unsigned long do_u64_read(int fd, const char *name, |
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uint64_t *buf, |
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unsigned long index, |
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unsigned long count) |
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{ |
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long bytes; |
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if (index > ULONG_MAX / 8) |
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fatal("index overflow: %lu\n", index); |
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bytes = pread(fd, buf, count * 8, (off_t)index * 8); |
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if (bytes < 0) { |
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perror(name); |
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exit(EXIT_FAILURE); |
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} |
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if (bytes % 8) |
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fatal("partial read: %lu bytes\n", bytes); |
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return bytes / 8; |
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} |
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static unsigned long kpageflags_read(uint64_t *buf, |
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unsigned long index, |
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unsigned long pages) |
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{ |
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return do_u64_read(kpageflags_fd, opt_kpageflags, buf, index, pages); |
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} |
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static unsigned long kpagecgroup_read(uint64_t *buf, |
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unsigned long index, |
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unsigned long pages) |
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{ |
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if (kpagecgroup_fd < 0) |
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return pages; |
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return do_u64_read(kpagecgroup_fd, opt_kpageflags, buf, index, pages); |
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} |
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static unsigned long kpagecount_read(uint64_t *buf, |
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unsigned long index, |
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unsigned long pages) |
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{ |
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return kpagecount_fd < 0 ? pages : |
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do_u64_read(kpagecount_fd, PROC_KPAGECOUNT, |
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buf, index, pages); |
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} |
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static unsigned long pagemap_read(uint64_t *buf, |
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unsigned long index, |
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unsigned long pages) |
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{ |
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return do_u64_read(pagemap_fd, "/proc/pid/pagemap", buf, index, pages); |
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} |
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static unsigned long pagemap_pfn(uint64_t val) |
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{ |
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unsigned long pfn; |
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if (val & PM_PRESENT) |
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pfn = PM_PFRAME(val); |
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else |
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pfn = 0; |
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return pfn; |
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} |
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static unsigned long pagemap_swap_offset(uint64_t val) |
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{ |
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return val & PM_SWAP ? PM_SWAP_OFFSET(val) : 0; |
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} |
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/* |
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* page flag names |
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*/ |
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static char *page_flag_name(uint64_t flags) |
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{ |
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static char buf[65]; |
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int present; |
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size_t i, j; |
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for (i = 0, j = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
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present = (flags >> i) & 1; |
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if (!page_flag_names[i]) { |
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if (present) |
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fatal("unknown flag bit %d\n", i); |
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continue; |
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} |
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buf[j++] = present ? page_flag_names[i][0] : '_'; |
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} |
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return buf; |
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} |
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static char *page_flag_longname(uint64_t flags) |
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{ |
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static char buf[1024]; |
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size_t i, n; |
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for (i = 0, n = 0; i < ARRAY_SIZE(page_flag_names); i++) { |
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if (!page_flag_names[i]) |
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continue; |
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if ((flags >> i) & 1) |
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n += snprintf(buf + n, sizeof(buf) - n, "%s,", |
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page_flag_names[i] + 2); |
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} |
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if (n) |
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n--; |
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buf[n] = '\0'; |
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return buf; |
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} |
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/* |
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* page list and summary |
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*/ |
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static void show_page_range(unsigned long voffset, unsigned long offset, |
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unsigned long size, uint64_t flags, |
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uint64_t cgroup, uint64_t mapcnt) |
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{ |
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static uint64_t flags0; |
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static uint64_t cgroup0; |
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static uint64_t mapcnt0; |
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static unsigned long voff; |
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static unsigned long index; |
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static unsigned long count; |
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if (flags == flags0 && cgroup == cgroup0 && mapcnt == mapcnt0 && |
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offset == index + count && size && voffset == voff + count) { |
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count += size; |
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return; |
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} |
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if (count) { |
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if (opt_pid) |
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printf("%lx\t", voff); |
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if (opt_file) |
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printf("%lu\t", voff); |
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if (opt_list_cgroup) |
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printf("@%llu\t", (unsigned long long)cgroup0); |
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if (opt_list_mapcnt) |
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printf("%lu\t", mapcnt0); |
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printf("%lx\t%lx\t%s\n", |
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index, count, page_flag_name(flags0)); |
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} |
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flags0 = flags; |
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cgroup0 = cgroup; |
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mapcnt0 = mapcnt; |
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index = offset; |
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voff = voffset; |
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count = size; |
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} |
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static void flush_page_range(void) |
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{ |
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show_page_range(0, 0, 0, 0, 0, 0); |
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} |
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static void show_page(unsigned long voffset, unsigned long offset, |
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uint64_t flags, uint64_t cgroup, uint64_t mapcnt) |
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{ |
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if (opt_pid) |
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printf("%lx\t", voffset); |
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if (opt_file) |
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printf("%lu\t", voffset); |
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if (opt_list_cgroup) |
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printf("@%llu\t", (unsigned long long)cgroup); |
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if (opt_list_mapcnt) |
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printf("%lu\t", mapcnt); |
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printf("%lx\t%s\n", offset, page_flag_name(flags)); |
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} |
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static void show_summary(void) |
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{ |
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size_t i; |
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printf(" flags\tpage-count MB" |
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" symbolic-flags\t\t\tlong-symbolic-flags\n"); |
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for (i = 0; i < ARRAY_SIZE(nr_pages); i++) { |
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if (nr_pages[i]) |
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printf("0x%016llx\t%10lu %8lu %s\t%s\n", |
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(unsigned long long)page_flags[i], |
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nr_pages[i], |
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pages2mb(nr_pages[i]), |
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page_flag_name(page_flags[i]), |
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page_flag_longname(page_flags[i])); |
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} |
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printf(" total\t%10lu %8lu\n", |
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total_pages, pages2mb(total_pages)); |
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} |
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/* |
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* page flag filters |
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*/ |
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static int bit_mask_ok(uint64_t flags) |
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{ |
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int i; |
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for (i = 0; i < nr_bit_filters; i++) { |
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if (opt_bits[i] == KPF_ALL_BITS) { |
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if ((flags & opt_mask[i]) == 0) |
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return 0; |
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} else { |
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if ((flags & opt_mask[i]) != opt_bits[i]) |
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return 0; |
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} |
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} |
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return 1; |
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} |
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static uint64_t expand_overloaded_flags(uint64_t flags, uint64_t pme) |
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{ |
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/* SLOB/SLUB overload several page flags */ |
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if (flags & BIT(SLAB)) { |
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if (flags & BIT(PRIVATE)) |
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flags ^= BIT(PRIVATE) | BIT(SLOB_FREE); |
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if (flags & BIT(ACTIVE)) |
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flags ^= BIT(ACTIVE) | BIT(SLUB_FROZEN); |
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if (flags & BIT(ERROR)) |
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flags ^= BIT(ERROR) | BIT(SLUB_DEBUG); |
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} |
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|
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/* PG_reclaim is overloaded as PG_readahead in the read path */ |
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if ((flags & (BIT(RECLAIM) | BIT(WRITEBACK))) == BIT(RECLAIM)) |
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flags ^= BIT(RECLAIM) | BIT(READAHEAD); |
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|
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if (pme & PM_SOFT_DIRTY) |
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flags |= BIT(SOFTDIRTY); |
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if (pme & PM_FILE) |
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flags |= BIT(FILE); |
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if (pme & PM_SWAP) |
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flags |= BIT(SWAP); |
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if (pme & PM_MMAP_EXCLUSIVE) |
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flags |= BIT(MMAP_EXCLUSIVE); |
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|
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return flags; |
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} |
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static uint64_t well_known_flags(uint64_t flags) |
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{ |
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/* hide flags intended only for kernel hacker */ |
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flags &= ~KPF_HACKERS_BITS; |
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|
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/* hide non-hugeTLB compound pages */ |
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if ((flags & BITS_COMPOUND) && !(flags & BIT(HUGE))) |
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flags &= ~BITS_COMPOUND; |
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return flags; |
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} |
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static uint64_t kpageflags_flags(uint64_t flags, uint64_t pme) |
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{ |
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if (opt_raw) |
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flags = expand_overloaded_flags(flags, pme); |
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else |
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flags = well_known_flags(flags); |
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return flags; |
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} |
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/* |
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* page actions |
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*/ |
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|
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static void prepare_hwpoison_fd(void) |
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{ |
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char buf[MAX_PATH + 1]; |
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|
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hwpoison_debug_fs = debugfs__mount(); |
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if (!hwpoison_debug_fs) { |
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perror("mount debugfs"); |
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exit(EXIT_FAILURE); |
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} |
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|
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if (opt_hwpoison && !hwpoison_inject_fd) { |
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snprintf(buf, MAX_PATH, "%s/hwpoison/corrupt-pfn", |
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hwpoison_debug_fs); |
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hwpoison_inject_fd = checked_open(buf, O_WRONLY); |
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} |
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|
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if (opt_unpoison && !hwpoison_forget_fd) { |
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snprintf(buf, MAX_PATH, "%s/hwpoison/unpoison-pfn", |
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hwpoison_debug_fs); |
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hwpoison_forget_fd = checked_open(buf, O_WRONLY); |
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} |
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} |
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static int hwpoison_page(unsigned long offset) |
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{ |
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char buf[100]; |
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int len; |
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|
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len = sprintf(buf, "0x%lx\n", offset); |
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len = write(hwpoison_inject_fd, buf, len); |
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if (len < 0) { |
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perror("hwpoison inject"); |
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return len; |
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} |
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return 0; |
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} |
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|
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static int unpoison_page(unsigned long offset) |
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{ |
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char buf[100]; |
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int len; |
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|
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len = sprintf(buf, "0x%lx\n", offset); |
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len = write(hwpoison_forget_fd, buf, len); |
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if (len < 0) { |
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perror("hwpoison forget"); |
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return len; |
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} |
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return 0; |
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} |
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static int mark_page_idle(unsigned long offset) |
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{ |
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static unsigned long off; |
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static uint64_t buf; |
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int len; |
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|
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if ((offset / 64 == off / 64) || buf == 0) { |
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buf |= 1UL << (offset % 64); |
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off = offset; |
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return 0; |
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} |
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|
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len = pwrite(page_idle_fd, &buf, 8, 8 * (off / 64)); |
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if (len < 0) { |
|
perror("mark page idle"); |
|
return len; |
|
} |
|
|
|
buf = 1UL << (offset % 64); |
|
off = offset; |
|
|
|
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 mapcnt, |
|
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_mark_idle) |
|
mark_page_idle(offset); |
|
|
|
if (opt_list == 1) |
|
show_page_range(voffset, offset, 1, flags, cgroup, mapcnt); |
|
else if (opt_list == 2) |
|
show_page(voffset, offset, flags, cgroup, mapcnt); |
|
|
|
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]; |
|
uint64_t cnt[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"); |
|
|
|
if (kpagecount_read(cnt, index, pages) != pages) |
|
fatal("kpagecount returned fewer pages than expected"); |
|
|
|
for (i = 0; i < pages; i++) |
|
add_page(voffset + i, index + i, |
|
buf[i], cgi[i], cnt[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, 0); |
|
else if (opt_list == 2) |
|
show_page(voffset, pagemap_swap_offset(pme), flags, 0, 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(opt_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]); |
|
|
|
if (opt_mark_idle) |
|
mark_page_idle(0); |
|
|
|
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" |
|
" -i|--mark-idle Mark pages idle\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" |
|
" -M|--list-mapcnt Show page map count\n" |
|
" -N|--no-summary Don't show summary info\n" |
|
" -X|--hwpoison hwpoison pages\n" |
|
" -x|--unpoison unpoison pages\n" |
|
" -F|--kpageflags filename kpageflags file to parse\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; |
|
uint64_t mapcnt = 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 (!kpagecount_read(&mapcnt, pfn, 1)) |
|
fatal("kpagecount_read failed"); |
|
if (first && opt_list) { |
|
first = 0; |
|
flush_page_range(); |
|
show_file(name, st); |
|
} |
|
add_page(off / page_size + i, pfn, |
|
flags, cgroup, mapcnt, 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(opt_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 parse_kpageflags(const char *name) |
|
{ |
|
opt_kpageflags = name; |
|
} |
|
|
|
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' }, |
|
{ "mark-idle" , 0, NULL, 'i' }, |
|
{ "list" , 0, NULL, 'l' }, |
|
{ "list-each" , 0, NULL, 'L' }, |
|
{ "list-cgroup", 0, NULL, 'C' }, |
|
{ "list-mapcnt", 0, NULL, 'M' }, |
|
{ "no-summary", 0, NULL, 'N' }, |
|
{ "hwpoison" , 0, NULL, 'X' }, |
|
{ "unpoison" , 0, NULL, 'x' }, |
|
{ "kpageflags", 0, NULL, 'F' }, |
|
{ "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:CilLMNXxF:h", |
|
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 'i': |
|
opt_mark_idle = 1; |
|
break; |
|
case 'l': |
|
opt_list = 1; |
|
break; |
|
case 'L': |
|
opt_list = 2; |
|
break; |
|
case 'M': |
|
opt_list_mapcnt = 1; |
|
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 'F': |
|
parse_kpageflags(optarg); |
|
break; |
|
case 'h': |
|
usage(); |
|
exit(0); |
|
default: |
|
usage(); |
|
exit(1); |
|
} |
|
} |
|
|
|
if (!opt_kpageflags) |
|
opt_kpageflags = PROC_KPAGEFLAGS; |
|
|
|
if (opt_cgroup || opt_list_cgroup) |
|
kpagecgroup_fd = checked_open(PROC_KPAGECGROUP, O_RDONLY); |
|
|
|
if (opt_list && opt_list_mapcnt) |
|
kpagecount_fd = checked_open(PROC_KPAGECOUNT, O_RDONLY); |
|
|
|
if (opt_mark_idle) |
|
page_idle_fd = checked_open(SYS_KERNEL_MM_PAGE_IDLE, O_RDWR); |
|
|
|
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 && opt_list_mapcnt) |
|
printf("map-cnt\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(); |
|
|
|
if (opt_list_mapcnt) |
|
close(kpagecount_fd); |
|
|
|
if (page_idle_fd >= 0) |
|
close(page_idle_fd); |
|
|
|
return 0; |
|
}
|
|
|