1181 строка
25 KiB
C
1181 строка
25 KiB
C
/*
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* page-types: Tool for querying page flags
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should find a copy of v2 of the GNU General Public License somewhere on
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* your Linux system; if not, write to the Free Software Foundation, Inc., 59
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* Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* Copyright (C) 2009 Intel corporation
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*
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* Authors: Wu Fengguang <fengguang.wu@intel.com>
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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 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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/* [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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/* [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 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_BALLOON] = "o:balloon",
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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_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_MMAP_EXCLUSIVE] = "1:mmap_exclusive",
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};
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static const char * const debugfs_known_mountpoints[] = {
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"/sys/kernel/debug",
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"/debug",
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0,
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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_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;
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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 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, 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, PROC_KPAGEFLAGS, 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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/*
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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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{
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static uint64_t flags0;
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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 && offset == index + count &&
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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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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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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);
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}
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static void show_page(unsigned long voffset,
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unsigned long offset, uint64_t flags)
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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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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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/* 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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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_MMAP_EXCLUSIVE)
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flags |= BIT(MMAP_EXCLUSIVE);
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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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/* 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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static void prepare_hwpoison_fd(void)
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{
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char buf[MAX_PATH + 1];
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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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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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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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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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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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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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/*
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* page frame walker
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*/
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|
|
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 pme)
|
|
{
|
|
flags = kpageflags_flags(flags, pme);
|
|
|
|
if (!bit_mask_ok(flags))
|
|
return;
|
|
|
|
if (opt_hwpoison)
|
|
hwpoison_page(offset);
|
|
if (opt_unpoison)
|
|
unpoison_page(offset);
|
|
|
|
if (opt_list == 1)
|
|
show_page_range(voffset, offset, 1, flags);
|
|
else if (opt_list == 2)
|
|
show_page(voffset, offset, flags);
|
|
|
|
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];
|
|
unsigned long batch;
|
|
unsigned long pages;
|
|
unsigned long i;
|
|
|
|
while (count) {
|
|
batch = min_t(unsigned long, count, KPAGEFLAGS_BATCH);
|
|
pages = kpageflags_read(buf, index, batch);
|
|
if (pages == 0)
|
|
break;
|
|
|
|
for (i = 0; i < pages; i++)
|
|
add_page(voffset + i, index + i, buf[i], pme);
|
|
|
|
index += pages;
|
|
count -= 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]);
|
|
}
|
|
|
|
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"
|
|
" -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"
|
|
" -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;
|
|
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 (first && opt_list) {
|
|
first = 0;
|
|
flush_page_range();
|
|
show_file(name, st);
|
|
}
|
|
add_page(off / page_size + i, pfn, flags, 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_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' },
|
|
{ "describe" , 1, NULL, 'd' },
|
|
{ "list" , 0, NULL, 'l' },
|
|
{ "list-each" , 0, NULL, 'L' },
|
|
{ "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:lLNXxh", 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 '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_list && opt_pid)
|
|
printf("voffset\t");
|
|
if (opt_list && opt_file)
|
|
printf("foffset\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;
|
|
}
|