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memory.c
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memory.c
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/* memory.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2019 David Anderson
* Copyright (C) 2002-2019 Red Hat, Inc. All rights reserved.
* Copyright (C) 2002 Silicon Graphics, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "defs.h"
#include <sys/mman.h>
#include <ctype.h>
#include <netinet/in.h>
#include <byteswap.h>
#include "maple_tree.h"
struct meminfo { /* general purpose memory information structure */
ulong cache; /* used by the various memory searching/dumping */
ulong slab; /* routines. Only one of these is used per cmd */
ulong c_flags; /* so stuff whatever's helpful in here... */
ulong c_offset;
ulong c_num;
ulong s_mem;
void *s_freep;
ulong *s_index;
ulong s_inuse;
ulong cpucached_cache;
ulong cpucached_slab;
ulong inuse;
ulong order;
ulong slabsize;
ulong num_slabs;
ulong objects;
ulonglong spec_addr;
ulong flags;
ulong size;
ulong objsize;
int memtype;
int free;
int slab_offset;
char *reqname;
char *curname;
ulong *spec_cpumask;
ulong *addrlist;
int *kmem_bufctl;
ulong *cpudata[NR_CPUS];
ulong *shared_array_cache;
int current_cache_index;
ulong found;
ulong retval;
struct struct_member_data *page_member_cache;
ulong nr_members;
char *ignore;
int errors;
int calls;
int cpu;
int cache_count;
ulong get_shared;
ulong get_totalram;
ulong get_buffers;
ulong get_slabs;
char *slab_buf;
char *cache_buf;
ulong *cache_list;
struct vmlist {
ulong addr;
ulong size;
} *vmlist;
ulong container;
int *freelist;
int freelist_index_size;
ulong random;
ulong list_offset;
};
/*
* Search modes
*/
#define SEARCH_ULONG (0)
#define SEARCH_UINT (1)
#define SEARCH_USHORT (2)
#define SEARCH_CHARS (3)
#define SEARCH_DEFAULT (SEARCH_ULONG)
/* search mode information */
struct searchinfo {
int mode;
int vcnt;
int val;
int context;
int memtype;
int do_task_header;
int tasks_found;
struct task_context *task_context;
ulong vaddr_start;
ulong vaddr_end;
ulonglong paddr_start;
ulonglong paddr_end;
union {
/* default ulong search */
struct {
ulong value[MAXARGS];
char *opt_string[MAXARGS];
ulong mask;
} s_ulong;
/* uint search */
struct {
uint value[MAXARGS];
char *opt_string[MAXARGS];
uint mask;
} s_uint;
/* ushort search */
struct {
ushort value[MAXARGS];
char *opt_string[MAXARGS];
ushort mask;
} s_ushort;
/* string (chars) search */
struct {
char *value[MAXARGS];
int len[MAXARGS];
int started_flag; /* string search needs history */
} s_chars;
} s_parms;
char buf[BUFSIZE];
};
struct handle_each_vm_area_args {
ulong task;
ulong flag;
ulong vaddr;
struct reference *ref;
char *vma_header;
char *buf1;
char *buf2;
char *buf3;
char *buf4;
char *buf5;
ulong vma;
char **vma_buf;
struct task_mem_usage *tm;
int *found;
int *single_vma_found;
unsigned int radix;
struct task_context *tc;
ulong *single_vma;
};
static char *memtype_string(int, int);
static char *error_handle_string(ulong);
static void collect_page_member_data(char *, struct meminfo *);
struct integer_data {
ulong value;
ulong bitfield_value;
struct struct_member_data *pmd;
};
static int get_bitfield_data(struct integer_data *);
static int show_page_member_data(char *, ulong, struct meminfo *, char *);
static void dump_mem_map(struct meminfo *);
static void dump_mem_map_SPARSEMEM(struct meminfo *);
static void fill_mem_map_cache(ulong, ulong, char *);
static void page_flags_init(void);
static int page_flags_init_from_pageflag_names(void);
static int page_flags_init_from_pageflags_enum(void);
static int translate_page_flags(char *, ulong);
static void dump_free_pages(struct meminfo *);
static int dump_zone_page_usage(void);
static void dump_multidimensional_free_pages(struct meminfo *);
static void dump_free_pages_zones_v1(struct meminfo *);
static void dump_free_pages_zones_v2(struct meminfo *);
struct free_page_callback_data;
static int dump_zone_free_area(ulong, int, ulong, struct free_page_callback_data *);
static void dump_page_hash_table(struct meminfo *);
static void kmem_search(struct meminfo *);
static void kmem_cache_init(void);
static void kmem_cache_init_slub(void);
static ulong max_cpudata_limit(ulong, ulong *);
static int kmem_cache_downsize(void);
static int ignore_cache(struct meminfo *, char *);
static char *is_kmem_cache_addr(ulong, char *);
static char *is_kmem_cache_addr_common(ulong, char *);
static void kmem_cache_list(struct meminfo *);
static void dump_kmem_cache(struct meminfo *);
static void dump_kmem_cache_percpu_v1(struct meminfo *);
static void dump_kmem_cache_percpu_v2(struct meminfo *);
static void dump_kmem_cache_slub(struct meminfo *);
static void kmem_cache_list_common(struct meminfo *);
static ulong get_cpu_slab_ptr(struct meminfo *, int, ulong *);
static unsigned int oo_order(ulong);
static unsigned int oo_objects(ulong);
static char *vaddr_to_kmem_cache(ulong, char *, int);
static char *is_slab_overload_page(ulong, ulong *, char *);
static ulong vaddr_to_slab(ulong);
static void do_slab_chain(int, struct meminfo *);
static void do_slab_chain_percpu_v1(long, struct meminfo *);
static void do_slab_chain_percpu_v2(long, struct meminfo *);
static void do_slab_chain_percpu_v2_nodes(long, struct meminfo *);
static void do_slab_chain_slab_overload_page(long, struct meminfo *);
static int slab_freelist_index_size(void);
static int do_slab_slub(struct meminfo *, int);
static void do_kmem_cache_slub(struct meminfo *);
static void save_slab_data(struct meminfo *);
static int slab_data_saved(struct meminfo *);
static void dump_saved_slab_data(void);
static void dump_slab(struct meminfo *);
static void dump_slab_percpu_v1(struct meminfo *);
static void dump_slab_percpu_v2(struct meminfo *);
static void dump_slab_overload_page(struct meminfo *);
static int verify_slab_v1(struct meminfo *, ulong, int);
static int verify_slab_v2(struct meminfo *, ulong, int);
static int verify_slab_overload_page(struct meminfo *, ulong, int);
static void gather_slab_free_list(struct meminfo *);
static void gather_slab_free_list_percpu(struct meminfo *);
static void gather_slab_free_list_slab_overload_page(struct meminfo *);
static void gather_cpudata_list_v1(struct meminfo *);
static void gather_cpudata_list_v2(struct meminfo *);
static void gather_cpudata_list_v2_nodes(struct meminfo *, int);
static int check_cpudata_list(struct meminfo *, ulong);
static int check_shared_list(struct meminfo *, ulong);
static void gather_slab_cached_count(struct meminfo *);
static void dump_slab_objects(struct meminfo *);
static void dump_slab_objects_percpu(struct meminfo *);
static void dump_vmlist(struct meminfo *);
static void dump_vmap_area(struct meminfo *);
static int get_vmap_area_list_from_nodes(ulong **);
static int dump_page_lists(struct meminfo *);
static void dump_kmeminfo(void);
static int page_to_phys(ulong, physaddr_t *);
static void display_memory(ulonglong, long, ulong, int, void *);
static char *show_opt_string(struct searchinfo *);
static void display_with_pre_and_post(void *, ulonglong, struct searchinfo *);
static ulong search_ulong(ulong *, ulong, int, struct searchinfo *);
static ulong search_uint(ulong *, ulong, int, struct searchinfo *);
static ulong search_ushort(ulong *, ulong, int, struct searchinfo *);
static ulong search_chars(ulong *, ulong, int, struct searchinfo *);
static ulonglong search_ulong_p(ulong *, ulonglong, int, struct searchinfo *);
static ulonglong search_uint_p(ulong *, ulonglong, int, struct searchinfo *);
static ulonglong search_ushort_p(ulong *, ulonglong, int, struct searchinfo *);
static ulonglong search_chars_p(ulong *, ulonglong, int, struct searchinfo *);
static void search_virtual(struct searchinfo *);
static void search_physical(struct searchinfo *);
static int next_upage(struct task_context *, ulong, ulong *);
static int next_kpage(ulong, ulong *);
static int next_physpage(ulonglong, ulonglong *);
static int next_vmlist_vaddr(ulong, ulong *);
static int next_module_vaddr(ulong, ulong *);
static int next_identity_mapping(ulong, ulong *);
static int vm_area_page_dump(ulong, ulong, ulong, ulong, ulong,
struct reference *);
static void rss_page_types_init(void);
static int dump_swap_info(ulong, ulong *, ulong *);
static int get_hugetlb_total_pages(ulong *, ulong *);
static char *get_swapdev(ulong, char *);
static void fill_swap_info(ulong);
static char *vma_file_offset(ulong, ulong, char *);
static ssize_t read_dev_kmem(ulong, char *, long);
static void dump_memory_nodes(int);
static void dump_zone_stats(void);
#define MEMORY_NODES_DUMP (0)
#define MEMORY_NODES_INITIALIZE (1)
static void node_table_init(void);
static int compare_node_data(const void *, const void *);
static void do_vm_flags(ulonglong);
static ulonglong get_vm_flags(char *);
static void PG_reserved_flag_init(void);
static void PG_slab_flag_init(void);
static ulong nr_blockdev_pages(void);
static ulong nr_blockdev_pages_v2(void);
void sparse_mem_init(void);
void dump_mem_sections(int);
void dump_memory_blocks(int);
void list_mem_sections(void);
ulong sparse_decode_mem_map(ulong, ulong);
char *read_mem_section(ulong);
ulong nr_to_section(ulong);
int valid_section(ulong);
int section_has_mem_map(ulong);
ulong section_mem_map_addr(ulong, int);
ulong valid_section_nr(ulong);
ulong pfn_to_map(ulong);
static int get_nodes_online(void);
static int next_online_node(int);
static ulong next_online_pgdat(int);
static int vm_stat_init(void);
static int vm_event_state_init(void);
static int dump_vm_stat(char *, long *, ulong);
static int dump_vm_event_state(void);
static int dump_page_states(void);
static int generic_read_dumpfile(ulonglong, void *, long, char *, ulong);
static int generic_write_dumpfile(ulonglong, void *, long, char *, ulong);
static int page_to_nid(ulong);
static int get_kmem_cache_list(ulong **);
static int get_kmem_cache_root_list(ulong **);
static int get_kmem_cache_child_list(ulong **, ulong);
static int get_kmem_cache_slub_data(long, struct meminfo *);
static ulong compound_head(ulong);
static long count_partial(ulong, struct meminfo *, ulong *);
static short count_cpu_partial(struct meminfo *, int);
static ulong get_freepointer(struct meminfo *, void *);
static int count_free_objects(struct meminfo *, ulong);
char *is_slab_page(struct meminfo *, char *);
static void do_cpu_partial_slub(struct meminfo *, int);
static void do_node_lists_slub(struct meminfo *, ulong, int);
static int devmem_is_restricted(void);
static int switch_to_proc_kcore(void);
static int verify_pfn(ulong);
static void dump_per_cpu_offsets(void);
static void dump_page_flags(ulonglong);
static ulong kmem_cache_nodelists(ulong);
static void dump_hstates(void);
static ulong freelist_ptr(struct meminfo *, ulong, ulong);
static ulong handle_each_vm_area(struct handle_each_vm_area_args *);
/*
* Memory display modes specific to this file.
*/
#define DISPLAY_8 (0x2)
#define DISPLAY_16 (0x4)
#define DISPLAY_32 (0x8)
#define DISPLAY_64 (0x10)
#define SHOW_OFFSET (0x20)
#define SYMBOLIC (0x40)
#define HEXADECIMAL (0x80)
#define DECIMAL (0x100)
#define UDECIMAL (0x200)
#define ASCII_ENDLINE (0x400)
#define NO_ASCII (0x800)
#define SLAB_CACHE (0x1000)
#define DISPLAY_ASCII (0x2000)
#define NET_ENDIAN (0x4000)
#define DISPLAY_RAW (0x8000)
#define NO_ERROR (0x10000)
#define SLAB_CACHE2 (0x20000)
#define DISPLAY_TYPES (DISPLAY_RAW|DISPLAY_ASCII|DISPLAY_8|\
DISPLAY_16|DISPLAY_32|DISPLAY_64)
#define ASCII_UNLIMITED ((ulong)(-1) >> 1)
static ulong DISPLAY_DEFAULT;
/*
* Verify that the sizeof the primitive types are reasonable.
*/
void
mem_init(void)
{
if (sizeof(char) != SIZEOF_8BIT)
error(FATAL, "unsupported sizeof(char): %d\n", sizeof(char));
if (sizeof(short) != SIZEOF_16BIT)
error(FATAL, "unsupported sizeof(short): %d\n", sizeof(short));
if ((sizeof(int) != SIZEOF_32BIT) && (sizeof(int) != SIZEOF_64BIT))
error(FATAL, "unsupported sizeof(int): %d\n", sizeof(int));
if ((sizeof(long) != SIZEOF_32BIT) && (sizeof(long) != SIZEOF_64BIT))
error(FATAL, "unsupported sizeof(long): %d\n", sizeof(long));
if (sizeof(void *) != sizeof(long))
error(FATAL, "pointer size: %d is not sizeof(long): %d\n", sizeof(void *), sizeof(long));
DISPLAY_DEFAULT = (sizeof(long) == 8) ? DISPLAY_64 : DISPLAY_32;
}
/*
* Stash a few popular offsets and some basic kernel virtual memory
* items used by routines in this file.
*/
void
vm_init(void)
{
char buf[BUFSIZE];
int i, len, dimension, nr_node_ids;
struct syment *sp_array[2];
ulong value1, value2;
char *kmem_cache_node_struct, *nodelists_field;
MEMBER_OFFSET_INIT(task_struct_mm, "task_struct", "mm");
MEMBER_OFFSET_INIT(mm_struct_mmap, "mm_struct", "mmap");
MEMBER_OFFSET_INIT(mm_struct_mm_mt, "mm_struct", "mm_mt");
if (VALID_MEMBER(mm_struct_mm_mt)) {
maple_init();
}
MEMBER_OFFSET_INIT(mm_struct_pgd, "mm_struct", "pgd");
MEMBER_OFFSET_INIT(mm_struct_rss, "mm_struct", "rss");
if (!VALID_MEMBER(mm_struct_rss))
MEMBER_OFFSET_INIT(mm_struct_rss, "mm_struct", "_rss");
MEMBER_OFFSET_INIT(mm_struct_anon_rss, "mm_struct", "_anon_rss");
MEMBER_OFFSET_INIT(mm_struct_file_rss, "mm_struct", "_file_rss");
if (!VALID_MEMBER(mm_struct_anon_rss)) {
MEMBER_OFFSET_INIT(mm_struct_rss_stat, "mm_struct", "rss_stat");
MEMBER_OFFSET_INIT(mm_rss_stat_count, "mm_rss_stat", "count");
}
MEMBER_OFFSET_INIT(mm_struct_total_vm, "mm_struct", "total_vm");
MEMBER_OFFSET_INIT(mm_struct_start_code, "mm_struct", "start_code");
MEMBER_OFFSET_INIT(mm_struct_mm_count, "mm_struct", "mm_count");
MEMBER_OFFSET_INIT(vm_area_struct_vm_mm, "vm_area_struct", "vm_mm");
MEMBER_OFFSET_INIT(vm_area_struct_vm_next, "vm_area_struct", "vm_next");
MEMBER_OFFSET_INIT(vm_area_struct_vm_end, "vm_area_struct", "vm_end");
MEMBER_OFFSET_INIT(vm_area_struct_vm_start,
"vm_area_struct", "vm_start");
MEMBER_OFFSET_INIT(vm_area_struct_vm_flags,
"vm_area_struct", "vm_flags");
MEMBER_OFFSET_INIT(vm_area_struct_vm_file, "vm_area_struct", "vm_file");
MEMBER_OFFSET_INIT(vm_area_struct_vm_offset,
"vm_area_struct", "vm_offset");
MEMBER_OFFSET_INIT(vm_area_struct_vm_pgoff,
"vm_area_struct", "vm_pgoff");
MEMBER_SIZE_INIT(vm_area_struct_vm_flags, "vm_area_struct", "vm_flags");
MEMBER_OFFSET_INIT(vm_struct_addr, "vm_struct", "addr");
MEMBER_OFFSET_INIT(vm_struct_size, "vm_struct", "size");
MEMBER_OFFSET_INIT(vm_struct_next, "vm_struct", "next");
MEMBER_OFFSET_INIT(vmap_area_va_start, "vmap_area", "va_start");
MEMBER_OFFSET_INIT(vmap_area_va_end, "vmap_area", "va_end");
MEMBER_OFFSET_INIT(vmap_area_list, "vmap_area", "list");
MEMBER_OFFSET_INIT(vmap_area_flags, "vmap_area", "flags");
MEMBER_OFFSET_INIT(vmap_area_vm, "vmap_area", "vm");
if (INVALID_MEMBER(vmap_area_vm))
MEMBER_OFFSET_INIT(vmap_area_vm, "vmap_area", "private");
MEMBER_OFFSET_INIT(vmap_area_purge_list, "vmap_area", "purge_list");
STRUCT_SIZE_INIT(vmap_area, "vmap_area");
if (VALID_MEMBER(vmap_area_va_start) &&
VALID_MEMBER(vmap_area_va_end) &&
VALID_MEMBER(vmap_area_list) &&
VALID_MEMBER(vmap_area_vm)) {
if (kernel_symbol_exists("vmap_nodes")) {
STRUCT_SIZE_INIT(vmap_node, "vmap_node");
MEMBER_OFFSET_INIT(vmap_node_busy, "vmap_node", "busy");
MEMBER_OFFSET_INIT(rb_list_head, "rb_list", "head");
vt->flags |= USE_VMAP_NODES;
} else if (kernel_symbol_exists("vmap_area_list"))
vt->flags |= USE_VMAP_AREA;
}
if (kernel_symbol_exists("hstates")) {
STRUCT_SIZE_INIT(hstate, "hstate");
MEMBER_OFFSET_INIT(hstate_order, "hstate", "order");
MEMBER_OFFSET_INIT(hstate_nr_huge_pages, "hstate", "nr_huge_pages");
MEMBER_OFFSET_INIT(hstate_free_huge_pages, "hstate", "free_huge_pages");
MEMBER_OFFSET_INIT(hstate_name, "hstate", "name");
}
MEMBER_OFFSET_INIT(page_next, "page", "next");
if (VALID_MEMBER(page_next))
MEMBER_OFFSET_INIT(page_prev, "page", "prev");
if (INVALID_MEMBER(page_next))
ANON_MEMBER_OFFSET_INIT(page_next, "page", "next");
if (INVALID_MEMBER(page_next))
MEMBER_OFFSET_INIT(page_next, "slab", "next");
MEMBER_OFFSET_INIT(page_list, "page", "list");
if (VALID_MEMBER(page_list)) {
ASSIGN_OFFSET(page_list_next) = OFFSET(page_list) +
OFFSET(list_head_next);
ASSIGN_OFFSET(page_list_prev) = OFFSET(page_list) +
OFFSET(list_head_prev);
}
MEMBER_OFFSET_INIT(page_next_hash, "page", "next_hash");
MEMBER_OFFSET_INIT(page_inode, "page", "inode");
MEMBER_OFFSET_INIT(page_offset, "page", "offset");
MEMBER_OFFSET_INIT(page_count, "page", "count");
if (INVALID_MEMBER(page_count)) {
MEMBER_OFFSET_INIT(page_count, "page", "_count");
if (INVALID_MEMBER(page_count))
ANON_MEMBER_OFFSET_INIT(page_count, "page", "_count");
if (INVALID_MEMBER(page_count))
MEMBER_OFFSET_INIT(page_count, "page", "_refcount");
if (INVALID_MEMBER(page_count))
ANON_MEMBER_OFFSET_INIT(page_count, "page", "_refcount");
}
MEMBER_OFFSET_INIT(page_flags, "page", "flags");
MEMBER_SIZE_INIT(page_flags, "page", "flags");
MEMBER_OFFSET_INIT(page_mapping, "page", "mapping");
if (INVALID_MEMBER(page_mapping))
ANON_MEMBER_OFFSET_INIT(page_mapping, "page", "mapping");
if (INVALID_MEMBER(page_mapping) &&
(THIS_KERNEL_VERSION < LINUX(2,6,17)) &&
MEMBER_EXISTS("page", "_mapcount"))
ASSIGN_OFFSET(page_mapping) = MEMBER_OFFSET("page", "_mapcount") +
STRUCT_SIZE("atomic_t") + sizeof(ulong);
MEMBER_OFFSET_INIT(page_index, "page", "index");
if (INVALID_MEMBER(page_index))
ANON_MEMBER_OFFSET_INIT(page_index, "page", "index");
MEMBER_OFFSET_INIT(page_buffers, "page", "buffers");
MEMBER_OFFSET_INIT(page_lru, "page", "lru");
if (INVALID_MEMBER(page_lru))
ANON_MEMBER_OFFSET_INIT(page_lru, "page", "lru");
MEMBER_OFFSET_INIT(page_pte, "page", "pte");
MEMBER_OFFSET_INIT(page_compound_head, "page", "compound_head");
if (INVALID_MEMBER(page_compound_head))
ANON_MEMBER_OFFSET_INIT(page_compound_head, "page", "compound_head");
MEMBER_OFFSET_INIT(page_private, "page", "private");
MEMBER_OFFSET_INIT(page_freelist, "page", "freelist");
MEMBER_OFFSET_INIT(mm_struct_pgd, "mm_struct", "pgd");
MEMBER_OFFSET_INIT(swap_info_struct_swap_file,
"swap_info_struct", "swap_file");
MEMBER_OFFSET_INIT(swap_info_struct_swap_vfsmnt,
"swap_info_struct", "swap_vfsmnt");
MEMBER_OFFSET_INIT(swap_info_struct_flags,
"swap_info_struct", "flags");
MEMBER_OFFSET_INIT(swap_info_struct_swap_map,
"swap_info_struct", "swap_map");
MEMBER_OFFSET_INIT(swap_info_struct_swap_device,
"swap_info_struct", "swap_device");
MEMBER_OFFSET_INIT(swap_info_struct_prio, "swap_info_struct", "prio");
MEMBER_OFFSET_INIT(swap_info_struct_max, "swap_info_struct", "max");
MEMBER_OFFSET_INIT(swap_info_struct_pages, "swap_info_struct", "pages");
MEMBER_OFFSET_INIT(swap_info_struct_inuse_pages, "swap_info_struct",
"inuse_pages");
MEMBER_OFFSET_INIT(swap_info_struct_old_block_size,
"swap_info_struct", "old_block_size");
MEMBER_OFFSET_INIT(swap_info_struct_bdev, "swap_info_struct", "bdev");
MEMBER_OFFSET_INIT(zs_pool_size_class, "zs_pool", "size_class");
MEMBER_OFFSET_INIT(size_class_size, "size_class", "size");
MEMBER_OFFSET_INIT(block_device_bd_inode, "block_device", "bd_inode");
MEMBER_OFFSET_INIT(block_device_bd_list, "block_device", "bd_list");
MEMBER_OFFSET_INIT(block_device_bd_disk, "block_device", "bd_disk");
MEMBER_OFFSET_INIT(inode_i_mapping, "inode", "i_mapping");
MEMBER_OFFSET_INIT(address_space_page_tree, "address_space", "page_tree");
if (INVALID_MEMBER(address_space_page_tree))
MEMBER_OFFSET_INIT(address_space_page_tree, "address_space", "i_pages");
MEMBER_OFFSET_INIT(address_space_nrpages, "address_space", "nrpages");
if (INVALID_MEMBER(address_space_nrpages))
MEMBER_OFFSET_INIT(address_space_nrpages, "address_space", "__nrpages");
MEMBER_OFFSET_INIT(super_block_s_inodes, "super_block", "s_inodes");
MEMBER_OFFSET_INIT(inode_i_sb_list, "inode", "i_sb_list");
MEMBER_OFFSET_INIT(gendisk_major, "gendisk", "major");
MEMBER_OFFSET_INIT(gendisk_fops, "gendisk", "fops");
MEMBER_OFFSET_INIT(gendisk_disk_name, "gendisk", "disk_name");
MEMBER_OFFSET_INIT(gendisk_private_data, "gendisk", "private_data");
STRUCT_SIZE_INIT(block_device, "block_device");
STRUCT_SIZE_INIT(address_space, "address_space");
STRUCT_SIZE_INIT(gendisk, "gendisk");
STRUCT_SIZE_INIT(blk_major_name, "blk_major_name");
if (VALID_STRUCT(blk_major_name)) {
MEMBER_OFFSET_INIT(blk_major_name_next, "blk_major_name",
"next");
MEMBER_OFFSET_INIT(blk_major_name_name, "blk_major_name",
"name");
MEMBER_OFFSET_INIT(blk_major_name_major, "blk_major_name",
"major");
}
STRUCT_SIZE_INIT(kmem_slab_s, "kmem_slab_s");
STRUCT_SIZE_INIT(slab_s, "slab_s");
STRUCT_SIZE_INIT(slab, "slab");
STRUCT_SIZE_INIT(kmem_cache_s, "kmem_cache_s");
STRUCT_SIZE_INIT(pgd_t, "pgd_t");
/*
* slab: overload struct slab over struct page
* https://lkml.org/lkml/2013/10/16/155
*
* commit e36ce448a08d removed kmem_cache.freelist_cache in 6.1,
* so use freelist_size instead.
*/
if (MEMBER_EXISTS("kmem_cache", "freelist_size")) {
vt->flags |= SLAB_OVERLOAD_PAGE;
ANON_MEMBER_OFFSET_INIT(page_s_mem, "page", "s_mem");
ANON_MEMBER_OFFSET_INIT(page_freelist, "page", "freelist");
ANON_MEMBER_OFFSET_INIT(page_active, "page", "active");
/*
* Moved to struct slab in Linux 5.17
*/
if (INVALID_MEMBER(page_s_mem))
MEMBER_OFFSET_INIT(page_s_mem, "slab", "s_mem");
if (INVALID_MEMBER(page_freelist))
MEMBER_OFFSET_INIT(page_freelist, "slab", "freelist");
if (INVALID_MEMBER(page_active))
MEMBER_OFFSET_INIT(page_active, "slab", "active");
MEMBER_OFFSET_INIT(slab_slab_list, "slab", "slab_list");
}
if (!VALID_STRUCT(kmem_slab_s) && VALID_STRUCT(slab_s)) {
vt->flags |= PERCPU_KMALLOC_V1;
MEMBER_OFFSET_INIT(kmem_cache_s_num, "kmem_cache_s", "num");
MEMBER_OFFSET_INIT(kmem_cache_s_next, "kmem_cache_s", "next");
MEMBER_OFFSET_INIT(kmem_cache_s_name, "kmem_cache_s", "name");
MEMBER_OFFSET_INIT(kmem_cache_s_objsize,
"kmem_cache_s", "objsize");
MEMBER_OFFSET_INIT(kmem_cache_s_flags, "kmem_cache_s", "flags");
MEMBER_OFFSET_INIT(kmem_cache_s_gfporder,
"kmem_cache_s", "gfporder");
MEMBER_OFFSET_INIT(kmem_cache_s_slabs,
"kmem_cache_s", "slabs");
MEMBER_OFFSET_INIT(kmem_cache_s_slabs_full,
"kmem_cache_s", "slabs_full");
MEMBER_OFFSET_INIT(kmem_cache_s_slabs_partial,
"kmem_cache_s", "slabs_partial");
MEMBER_OFFSET_INIT(kmem_cache_s_slabs_free,
"kmem_cache_s", "slabs_free");
MEMBER_OFFSET_INIT(kmem_cache_s_cpudata,
"kmem_cache_s", "cpudata");
ARRAY_LENGTH_INIT(len, NULL, "kmem_cache_s.cpudata", NULL, 0);
MEMBER_OFFSET_INIT(kmem_cache_s_colour_off,
"kmem_cache_s", "colour_off");
MEMBER_OFFSET_INIT(slab_s_list, "slab_s", "list");
MEMBER_OFFSET_INIT(slab_s_s_mem, "slab_s", "s_mem");
MEMBER_OFFSET_INIT(slab_s_inuse, "slab_s", "inuse");
MEMBER_OFFSET_INIT(slab_s_free, "slab_s", "free");
MEMBER_OFFSET_INIT(cpucache_s_avail, "cpucache_s", "avail");
MEMBER_OFFSET_INIT(cpucache_s_limit, "cpucache_s", "limit");
STRUCT_SIZE_INIT(cpucache_s, "cpucache_s");
} else if (!VALID_STRUCT(kmem_slab_s) &&
!VALID_STRUCT(slab_s) &&
!MEMBER_EXISTS("kmem_cache", "cpu_slab") &&
(VALID_STRUCT(slab) || (vt->flags & SLAB_OVERLOAD_PAGE))) {
vt->flags |= PERCPU_KMALLOC_V2;
if (VALID_STRUCT(kmem_cache_s)) {
MEMBER_OFFSET_INIT(kmem_cache_s_num, "kmem_cache_s", "num");
MEMBER_OFFSET_INIT(kmem_cache_s_next, "kmem_cache_s", "next");
MEMBER_OFFSET_INIT(kmem_cache_s_name, "kmem_cache_s", "name");
MEMBER_OFFSET_INIT(kmem_cache_s_colour_off, "kmem_cache_s",
"colour_off");
MEMBER_OFFSET_INIT(kmem_cache_s_objsize, "kmem_cache_s",
"objsize");
MEMBER_OFFSET_INIT(kmem_cache_s_flags, "kmem_cache_s", "flags");
MEMBER_OFFSET_INIT(kmem_cache_s_gfporder,
"kmem_cache_s", "gfporder");
MEMBER_OFFSET_INIT(kmem_cache_s_lists, "kmem_cache_s", "lists");
MEMBER_OFFSET_INIT(kmem_cache_s_array, "kmem_cache_s", "array");
ARRAY_LENGTH_INIT(len, NULL, "kmem_cache_s.array", NULL, 0);
} else {
STRUCT_SIZE_INIT(kmem_cache_s, "kmem_cache");
MEMBER_OFFSET_INIT(kmem_cache_s_num, "kmem_cache", "num");
MEMBER_OFFSET_INIT(kmem_cache_s_next, "kmem_cache", "next");
if (INVALID_MEMBER(kmem_cache_s_next)) {
/*
* slab/slub unification starting in Linux 3.6.
*/
MEMBER_OFFSET_INIT(kmem_cache_s_next, "kmem_cache", "list");
MEMBER_OFFSET_INIT(kmem_cache_list, "kmem_cache", "list");
MEMBER_OFFSET_INIT(kmem_cache_name, "kmem_cache", "name");
MEMBER_OFFSET_INIT(kmem_cache_size, "kmem_cache", "size");
STRUCT_SIZE_INIT(kmem_cache, "kmem_cache");
}
MEMBER_OFFSET_INIT(kmem_cache_s_name, "kmem_cache", "name");
MEMBER_OFFSET_INIT(kmem_cache_s_colour_off, "kmem_cache",
"colour_off");
if (MEMBER_EXISTS("kmem_cache", "objsize"))
MEMBER_OFFSET_INIT(kmem_cache_s_objsize, "kmem_cache",
"objsize");
else if (MEMBER_EXISTS("kmem_cache", "buffer_size"))
MEMBER_OFFSET_INIT(kmem_cache_s_objsize, "kmem_cache",
"buffer_size");
else if (MEMBER_EXISTS("kmem_cache", "size"))
MEMBER_OFFSET_INIT(kmem_cache_s_objsize, "kmem_cache",
"size");
MEMBER_OFFSET_INIT(kmem_cache_s_flags, "kmem_cache", "flags");
MEMBER_OFFSET_INIT(kmem_cache_s_gfporder,
"kmem_cache", "gfporder");
MEMBER_OFFSET_INIT(kmem_cache_cpu_cache, "kmem_cache", "cpu_cache");
if (MEMBER_EXISTS("kmem_cache", "lists"))
MEMBER_OFFSET_INIT(kmem_cache_s_lists, "kmem_cache", "lists");
else if (MEMBER_EXISTS("kmem_cache", "nodelists") ||
MEMBER_EXISTS("kmem_cache", "node")) {
nodelists_field = MEMBER_EXISTS("kmem_cache", "node") ?
"node" : "nodelists";
vt->flags |= PERCPU_KMALLOC_V2_NODES;
MEMBER_OFFSET_INIT(kmem_cache_s_lists, "kmem_cache", nodelists_field);
if (MEMBER_TYPE("kmem_cache", nodelists_field) == TYPE_CODE_PTR) {
/*
* nodelists now a pointer to an outside array
*/
vt->flags |= NODELISTS_IS_PTR;
if (kernel_symbol_exists("nr_node_ids")) {
get_symbol_data("nr_node_ids", sizeof(int),
&nr_node_ids);
vt->kmem_cache_len_nodes = nr_node_ids;
} else
vt->kmem_cache_len_nodes = 1;
} else if (VALID_MEMBER(kmem_cache_cpu_cache)) {
/*
* commit bf0dea23a9c094ae869a88bb694fbe966671bf6d
* mm/slab: use percpu allocator for cpu cache
*/
vt->flags |= SLAB_CPU_CACHE;
MEMBER_OFFSET_INIT(kmem_cache_node, "kmem_cache", "node");
if (kernel_symbol_exists("nr_node_ids")) {
get_symbol_data("nr_node_ids", sizeof(int),
&nr_node_ids);
vt->kmem_cache_len_nodes = nr_node_ids;
} else
vt->kmem_cache_len_nodes = 1;
} else {
/*
* This should never happen with kmem_cache.node,
* only with kmem_cache.nodelists
*/
ARRAY_LENGTH_INIT(vt->kmem_cache_len_nodes, NULL,
"kmem_cache.nodelists", NULL, 0);
}
}
MEMBER_OFFSET_INIT(kmem_cache_s_array, "kmem_cache", "array");
ARRAY_LENGTH_INIT(len, NULL, "kmem_cache.array", NULL, 0);
}
if (VALID_STRUCT(slab)) {
MEMBER_OFFSET_INIT(slab_list, "slab", "list");
MEMBER_OFFSET_INIT(slab_s_mem, "slab", "s_mem");
MEMBER_OFFSET_INIT(slab_inuse, "slab", "inuse");
MEMBER_OFFSET_INIT(slab_free, "slab", "free");
/*
* slab members were moved to an anonymous union in 2.6.39.
*/
if (INVALID_MEMBER(slab_list))
ANON_MEMBER_OFFSET_INIT(slab_list, "slab", "list");
if (INVALID_MEMBER(slab_s_mem))
ANON_MEMBER_OFFSET_INIT(slab_s_mem, "slab", "s_mem");
if (INVALID_MEMBER(slab_inuse))
ANON_MEMBER_OFFSET_INIT(slab_inuse, "slab", "inuse");
if (INVALID_MEMBER(slab_free))
ANON_MEMBER_OFFSET_INIT(slab_free, "slab", "free");
}
MEMBER_OFFSET_INIT(array_cache_avail, "array_cache", "avail");
MEMBER_OFFSET_INIT(array_cache_limit, "array_cache", "limit");
STRUCT_SIZE_INIT(array_cache, "array_cache");
/*
* kmem_list3 renamed to kmem_cache_node in kernel 3.11-rc1
*/
kmem_cache_node_struct = STRUCT_EXISTS("kmem_cache_node") ?
"kmem_cache_node" : "kmem_list3";
MEMBER_OFFSET_INIT(kmem_list3_slabs_partial,
kmem_cache_node_struct, "slabs_partial");
MEMBER_OFFSET_INIT(kmem_list3_slabs_full,
kmem_cache_node_struct, "slabs_full");
MEMBER_OFFSET_INIT(kmem_list3_slabs_free,
kmem_cache_node_struct, "slabs_free");
MEMBER_OFFSET_INIT(kmem_list3_free_objects,
kmem_cache_node_struct, "free_objects");
MEMBER_OFFSET_INIT(kmem_list3_shared, kmem_cache_node_struct, "shared");
/*
* Common to slab/slub
*/
MEMBER_OFFSET_INIT(page_slab, "page", "slab_cache");
if (INVALID_MEMBER(page_slab))
ANON_MEMBER_OFFSET_INIT(page_slab, "page", "slab_cache");
MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page");
if (INVALID_MEMBER(page_slab_page))
ANON_MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page");
MEMBER_OFFSET_INIT(page_first_page, "page", "first_page");
if (INVALID_MEMBER(page_first_page))
ANON_MEMBER_OFFSET_INIT(page_first_page, "page", "first_page");
} else if (MEMBER_EXISTS("kmem_cache", "cpu_slab") &&
STRUCT_EXISTS("kmem_cache_node")) {
vt->flags |= KMALLOC_SLUB;
STRUCT_SIZE_INIT(kmem_cache, "kmem_cache");
MEMBER_OFFSET_INIT(kmem_cache_size, "kmem_cache", "size");
MEMBER_OFFSET_INIT(kmem_cache_objsize, "kmem_cache", "objsize");
if (INVALID_MEMBER(kmem_cache_objsize))
MEMBER_OFFSET_INIT(kmem_cache_objsize, "kmem_cache",
"object_size");
MEMBER_OFFSET_INIT(kmem_cache_offset, "kmem_cache", "offset");
MEMBER_OFFSET_INIT(kmem_cache_order, "kmem_cache", "order");
MEMBER_OFFSET_INIT(kmem_cache_local_node, "kmem_cache", "local_node");
MEMBER_OFFSET_INIT(kmem_cache_objects, "kmem_cache", "objects");
MEMBER_OFFSET_INIT(kmem_cache_inuse, "kmem_cache", "inuse");
MEMBER_OFFSET_INIT(kmem_cache_align, "kmem_cache", "align");
MEMBER_OFFSET_INIT(kmem_cache_node, "kmem_cache", "node");
MEMBER_OFFSET_INIT(kmem_cache_cpu_slab, "kmem_cache", "cpu_slab");
MEMBER_OFFSET_INIT(kmem_cache_list, "kmem_cache", "list");
MEMBER_OFFSET_INIT(kmem_cache_red_left_pad, "kmem_cache", "red_left_pad");
MEMBER_OFFSET_INIT(kmem_cache_name, "kmem_cache", "name");
MEMBER_OFFSET_INIT(kmem_cache_flags, "kmem_cache", "flags");
MEMBER_OFFSET_INIT(kmem_cache_random, "kmem_cache", "random");
MEMBER_OFFSET_INIT(kmem_cache_cpu_freelist, "kmem_cache_cpu", "freelist");
MEMBER_OFFSET_INIT(kmem_cache_cpu_page, "kmem_cache_cpu", "page");
if (INVALID_MEMBER(kmem_cache_cpu_page))
MEMBER_OFFSET_INIT(kmem_cache_cpu_page, "kmem_cache_cpu", "slab");
MEMBER_OFFSET_INIT(kmem_cache_cpu_node, "kmem_cache_cpu", "node");
MEMBER_OFFSET_INIT(kmem_cache_cpu_partial, "kmem_cache_cpu", "partial");
MEMBER_OFFSET_INIT(page_inuse, "page", "inuse");
if (INVALID_MEMBER(page_inuse))
ANON_MEMBER_OFFSET_INIT(page_inuse, "page", "inuse");
if (INVALID_MEMBER(page_inuse))
MEMBER_OFFSET_INIT(page_inuse, "slab", "inuse");
MEMBER_OFFSET_INIT(page_offset, "page", "offset");
if (INVALID_MEMBER(page_offset))
ANON_MEMBER_OFFSET_INIT(page_offset, "page", "offset");
MEMBER_OFFSET_INIT(page_slab, "page", "slab");
if (INVALID_MEMBER(page_slab))
ANON_MEMBER_OFFSET_INIT(page_slab, "page", "slab");
if (INVALID_MEMBER(page_slab)) {
MEMBER_OFFSET_INIT(page_slab, "page", "slab_cache");
if (INVALID_MEMBER(page_slab))
ANON_MEMBER_OFFSET_INIT(page_slab, "page", "slab_cache");
}
if (INVALID_MEMBER(page_slab))
MEMBER_OFFSET_INIT(page_slab, "slab", "slab_cache");
MEMBER_OFFSET_INIT(slab_slab_list, "slab", "slab_list");
MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page");
if (INVALID_MEMBER(page_slab_page))
ANON_MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page");
MEMBER_OFFSET_INIT(page_first_page, "page", "first_page");
if (INVALID_MEMBER(page_first_page))
ANON_MEMBER_OFFSET_INIT(page_first_page, "page", "first_page");
MEMBER_OFFSET_INIT(page_freelist, "page", "freelist");
if (INVALID_MEMBER(page_freelist))
ANON_MEMBER_OFFSET_INIT(page_freelist, "page", "freelist");
if (INVALID_MEMBER(page_freelist))
MEMBER_OFFSET_INIT(page_freelist, "slab", "freelist");
if (INVALID_MEMBER(kmem_cache_objects)) {
MEMBER_OFFSET_INIT(kmem_cache_oo, "kmem_cache", "oo");
/* NOTE: returns offset of containing bitfield */
ANON_MEMBER_OFFSET_INIT(page_objects, "page", "objects");
if (INVALID_MEMBER(page_objects))
ANON_MEMBER_OFFSET_INIT(page_objects, "slab", "objects");
}
if (VALID_MEMBER(kmem_cache_node)) {
ARRAY_LENGTH_INIT(len, NULL, "kmem_cache.node", NULL, 0);
vt->flags |= CONFIG_NUMA;
}
ARRAY_LENGTH_INIT(len, NULL, "kmem_cache.cpu_slab", NULL, 0);
STRUCT_SIZE_INIT(kmem_cache_node, "kmem_cache_node");
STRUCT_SIZE_INIT(kmem_cache_cpu, "kmem_cache_cpu");
MEMBER_OFFSET_INIT(kmem_cache_node_nr_partial,
"kmem_cache_node", "nr_partial");
MEMBER_OFFSET_INIT(kmem_cache_node_nr_slabs,
"kmem_cache_node", "nr_slabs");
MEMBER_OFFSET_INIT(kmem_cache_node_total_objects,
"kmem_cache_node", "total_objects");
MEMBER_OFFSET_INIT(kmem_cache_node_partial,
"kmem_cache_node", "partial");
MEMBER_OFFSET_INIT(kmem_cache_node_full,
"kmem_cache_node", "full");
} else {
MEMBER_OFFSET_INIT(kmem_cache_s_c_nextp,
"kmem_cache_s", "c_nextp");
MEMBER_OFFSET_INIT(kmem_cache_s_c_name,
"kmem_cache_s", "c_name");
MEMBER_OFFSET_INIT(kmem_cache_s_c_num,
"kmem_cache_s", "c_num");
MEMBER_OFFSET_INIT(kmem_cache_s_c_org_size,
"kmem_cache_s", "c_org_size");
MEMBER_OFFSET_INIT(kmem_cache_s_c_flags,
"kmem_cache_s", "c_flags");
MEMBER_OFFSET_INIT(kmem_cache_s_c_offset,
"kmem_cache_s", "c_offset");
MEMBER_OFFSET_INIT(kmem_cache_s_c_firstp,
"kmem_cache_s", "c_firstp");
MEMBER_OFFSET_INIT(kmem_cache_s_c_gfporder,
"kmem_cache_s", "c_gfporder");
MEMBER_OFFSET_INIT(kmem_cache_s_c_magic,
"kmem_cache_s", "c_magic");
MEMBER_OFFSET_INIT(kmem_cache_s_c_align,
"kmem_cache_s", "c_align");
MEMBER_OFFSET_INIT(kmem_slab_s_s_nextp,
"kmem_slab_s", "s_nextp");
MEMBER_OFFSET_INIT(kmem_slab_s_s_freep,
"kmem_slab_s", "s_freep");
MEMBER_OFFSET_INIT(kmem_slab_s_s_inuse,
"kmem_slab_s", "s_inuse");
MEMBER_OFFSET_INIT(kmem_slab_s_s_mem,
"kmem_slab_s", "s_mem");
MEMBER_OFFSET_INIT(kmem_slab_s_s_index,
"kmem_slab_s", "s_index");
MEMBER_OFFSET_INIT(kmem_slab_s_s_offset,
"kmem_slab_s", "s_offset");
MEMBER_OFFSET_INIT(kmem_slab_s_s_magic,
"kmem_slab_s", "s_magic");
}
if (kernel_symbol_exists("slab_root_caches")) {
MEMBER_OFFSET_INIT(kmem_cache_memcg_params,
"kmem_cache", "memcg_params");
MEMBER_OFFSET_INIT(memcg_cache_params___root_caches_node,
"memcg_cache_params", "__root_caches_node");
MEMBER_OFFSET_INIT(memcg_cache_params_children,
"memcg_cache_params", "children");
MEMBER_OFFSET_INIT(memcg_cache_params_children_node,
"memcg_cache_params", "children_node");
if (VALID_MEMBER(kmem_cache_memcg_params)
&& VALID_MEMBER(memcg_cache_params___root_caches_node)
&& VALID_MEMBER(memcg_cache_params_children)
&& VALID_MEMBER(memcg_cache_params_children_node))
vt->flags |= SLAB_ROOT_CACHES;
}
if (!kt->kernel_NR_CPUS) {
if (enumerator_value("WORK_CPU_UNBOUND", (long *)&value1))
kt->kernel_NR_CPUS = (int)value1;
else if ((i = get_array_length("__per_cpu_offset", NULL, 0)))
kt->kernel_NR_CPUS = i;
else if (ARRAY_LENGTH(kmem_cache_s_cpudata))
kt->kernel_NR_CPUS = ARRAY_LENGTH(kmem_cache_s_cpudata);
else if (ARRAY_LENGTH(kmem_cache_s_array))
kt->kernel_NR_CPUS = ARRAY_LENGTH(kmem_cache_s_array);
else if (ARRAY_LENGTH(kmem_cache_cpu_slab))
kt->kernel_NR_CPUS = ARRAY_LENGTH(kmem_cache_cpu_slab);
}
if (CRASHDEBUG(1))
fprintf(fp, "kernel NR_CPUS: %d %s\n", kt->kernel_NR_CPUS,
kt->kernel_NR_CPUS ? "" : "(unknown)");
if (kt->kernel_NR_CPUS > NR_CPUS) {
error(WARNING,
"kernel-configured NR_CPUS (%d) greater than compiled-in NR_CPUS (%d)\n",
kt->kernel_NR_CPUS, NR_CPUS);
error(FATAL, "recompile crash with larger NR_CPUS\n");
}
if (machdep->init_kernel_pgd)
machdep->init_kernel_pgd();
else if (symbol_exists("swapper_pg_dir")) {
value1 = symbol_value("swapper_pg_dir");
for (i = 0; i < NR_CPUS; i++)
vt->kernel_pgd[i] = value1;
} else if (symbol_exists("cpu_pgd")) {
len = get_array_length("cpu_pgd", &dimension, 0);
if ((len == NR_CPUS) && (dimension == machdep->ptrs_per_pgd)) {
value1 = symbol_value("cpu_pgd");
for (i = 0; i < NR_CPUS; i++) {
value2 = i *
(SIZE(pgd_t) * machdep->ptrs_per_pgd);
vt->kernel_pgd[i] = value1 + value2;
}
error(WARNING,
"no swapper_pg_dir: using first entry of cpu_pgd[%d][%d]\n\n",
dimension, len);
} else {
error(WARNING,
"unrecognized dimensions: cpu_pgd[%d][%d]\n",
dimension, len);
value1 = symbol_value("cpu_pgd");
for (i = 0; i < NR_CPUS; i++)
vt->kernel_pgd[i] = value1;
error(WARNING,
"no swapper_pg_dir: using first entry of cpu_pgd[%d][%d]\n\n",
dimension, len);
}
} else
error(FATAL, "no swapper_pg_dir or cpu_pgd symbols exist?\n");
get_symbol_data("high_memory", sizeof(ulong), &vt->high_memory);
if (kernel_symbol_exists("mem_section"))
vt->flags |= SPARSEMEM;
else if (kernel_symbol_exists("mem_map")) {
get_symbol_data("mem_map", sizeof(char *), &vt->mem_map);
vt->flags |= FLATMEM;
} else
vt->flags |= DISCONTIGMEM;
sparse_mem_init();
vt->vmalloc_start = machdep->vmalloc_start();
if (IS_VMALLOC_ADDR(vt->mem_map))
vt->flags |= V_MEM_MAP;
vt->total_pages = BTOP(VTOP(vt->high_memory));
if (symbol_exists("_totalram_pages")) {
readmem(symbol_value("_totalram_pages") +
OFFSET(atomic_t_counter), KVADDR,
&vt->totalram_pages, sizeof(ulong),
"_totalram_pages", FAULT_ON_ERROR);
} else {
switch (get_syment_array("totalram_pages", sp_array, 2))
{
case 1: