1#ifndef _LINUX_MM_TYPES_H 2#define _LINUX_MM_TYPES_H 3 4#include <linux/auxvec.h> 5#include <linux/types.h> 6#include <linux/threads.h> 7#include <linux/list.h> 8#include <linux/spinlock.h> 9#include <linux/prio_tree.h> 10#include <linux/rbtree.h> 11#include <linux/rwsem.h> 12#include <linux/completion.h> 13#include <asm/page.h> 14#include <asm/mmu.h> 15 16#ifndef AT_VECTOR_SIZE_ARCH 17#define AT_VECTOR_SIZE_ARCH 0 18#endif 19#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) 20 21struct address_space; 22 23#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 24typedef atomic_long_t mm_counter_t; 25#else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 26typedef unsigned long mm_counter_t; 27#endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 28 29/* 30 * Each physical page in the system has a struct page associated with 31 * it to keep track of whatever it is we are using the page for at the 32 * moment. Note that we have no way to track which tasks are using 33 * a page, though if it is a pagecache page, rmap structures can tell us 34 * who is mapping it. 35 */ 36struct page { 37 unsigned long flags; /* Atomic flags, some possibly 38 * updated asynchronously */ 39 atomic_t _count; /* Usage count, see below. */ 40 union { 41 atomic_t _mapcount; /* Count of ptes mapped in mms, 42 * to show when page is mapped 43 * & limit reverse map searches. 44 */ 45 struct { /* SLUB */ 46 u16 inuse; 47 u16 objects; 48 }; 49 }; 50 union { 51 struct { 52 unsigned long private; /* Mapping-private opaque data: 53 * usually used for buffer_heads 54 * if PagePrivate set; used for 55 * swp_entry_t if PageSwapCache; 56 * indicates order in the buddy 57 * system if PG_buddy is set. 58 */ 59 struct address_space *mapping; /* If low bit clear, points to 60 * inode address_space, or NULL. 61 * If page mapped as anonymous 62 * memory, low bit is set, and 63 * it points to anon_vma object: 64 * see PAGE_MAPPING_ANON below. 65 */ 66 }; 67#if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 68 spinlock_t ptl; 69#endif 70 struct kmem_cache *slab; /* SLUB: Pointer to slab */ 71 struct page *first_page; /* Compound tail pages */ 72 }; 73 union { 74 pgoff_t index; /* Our offset within mapping. */ 75 void *freelist; /* SLUB: freelist req. slab lock */ 76 }; 77 struct list_head lru; /* Pageout list, eg. active_list 78 * protected by zone->lru_lock ! 79 */ 80 /* 81 * On machines where all RAM is mapped into kernel address space, 82 * we can simply calculate the virtual address. On machines with 83 * highmem some memory is mapped into kernel virtual memory 84 * dynamically, so we need a place to store that address. 85 * Note that this field could be 16 bits on x86 ... ;) 86 * 87 * Architectures with slow multiplication can define 88 * WANT_PAGE_VIRTUAL in asm/page.h 89 */ 90#if defined(WANT_PAGE_VIRTUAL) 91 void *virtual; /* Kernel virtual address (NULL if 92 not kmapped, ie. highmem) */ 93#endif /* WANT_PAGE_VIRTUAL */ 94#ifdef CONFIG_CGROUP_MEM_RES_CTLR 95 unsigned long page_cgroup; 96#endif 97}; 98 99/* 100 * This struct defines a memory VMM memory area. There is one of these 101 * per VM-area/task. A VM area is any part of the process virtual memory 102 * space that has a special rule for the page-fault handlers (ie a shared 103 * library, the executable area etc). 104 */ 105struct vm_area_struct { 106 struct mm_struct * vm_mm; /* The address space we belong to. */ 107 unsigned long vm_start; /* Our start address within vm_mm. */ 108 unsigned long vm_end; /* The first byte after our end address 109 within vm_mm. */ 110 111 /* linked list of VM areas per task, sorted by address */ 112 struct vm_area_struct *vm_next; 113 114 pgprot_t vm_page_prot; /* Access permissions of this VMA. */ 115 unsigned long vm_flags; /* Flags, listed below. */ 116 117 struct rb_node vm_rb; 118 119 /* 120 * For areas with an address space and backing store, 121 * linkage into the address_space->i_mmap prio tree, or 122 * linkage to the list of like vmas hanging off its node, or 123 * linkage of vma in the address_space->i_mmap_nonlinear list. 124 */ 125 union { 126 struct { 127 struct list_head list; 128 void *parent; /* aligns with prio_tree_node parent */ 129 struct vm_area_struct *head; 130 } vm_set; 131 132 struct raw_prio_tree_node prio_tree_node; 133 } shared; 134 135 /* 136 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma 137 * list, after a COW of one of the file pages. A MAP_SHARED vma 138 * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack 139 * or brk vma (with NULL file) can only be in an anon_vma list. 140 */ 141 struct list_head anon_vma_node; /* Serialized by anon_vma->lock */ 142 struct anon_vma *anon_vma; /* Serialized by page_table_lock */ 143 144 /* Function pointers to deal with this struct. */ 145 struct vm_operations_struct * vm_ops; 146 147 /* Information about our backing store: */ 148 unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE 149 units, *not* PAGE_CACHE_SIZE */ 150 struct file * vm_file; /* File we map to (can be NULL). */ 151 void * vm_private_data; /* was vm_pte (shared mem) */ 152 unsigned long vm_truncate_count;/* truncate_count or restart_addr */ 153 154#ifndef CONFIG_MMU 155 atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */ 156#endif 157#ifdef CONFIG_NUMA 158 struct mempolicy *vm_policy; /* NUMA policy for the VMA */ 159#endif 160}; 161 162struct mm_struct { 163 struct vm_area_struct * mmap; /* list of VMAs */ 164 struct rb_root mm_rb; 165 struct vm_area_struct * mmap_cache; /* last find_vma result */ 166 unsigned long (*get_unmapped_area) (struct file *filp, 167 unsigned long addr, unsigned long len, 168 unsigned long pgoff, unsigned long flags); 169 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 170 unsigned long mmap_base; /* base of mmap area */ 171 unsigned long task_size; /* size of task vm space */ 172 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 173 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 174 pgd_t * pgd; 175 atomic_t mm_users; /* How many users with user space? */ 176 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 177 int map_count; /* number of VMAs */ 178 int core_waiters; 179 struct rw_semaphore mmap_sem; 180 spinlock_t page_table_lock; /* Protects page tables and some counters */ 181 182 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 183 * together off init_mm.mmlist, and are protected 184 * by mmlist_lock 185 */ 186 187 /* Special counters, in some configurations protected by the 188 * page_table_lock, in other configurations by being atomic. 189 */ 190 mm_counter_t _file_rss; 191 mm_counter_t _anon_rss; 192 193 unsigned long hiwater_rss; /* High-watermark of RSS usage */ 194 unsigned long hiwater_vm; /* High-water virtual memory usage */ 195 196 unsigned long total_vm, locked_vm, shared_vm, exec_vm; 197 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; 198 unsigned long start_code, end_code, start_data, end_data; 199 unsigned long start_brk, brk, start_stack; 200 unsigned long arg_start, arg_end, env_start, env_end; 201 202 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 203 204 cpumask_t cpu_vm_mask; 205 206 /* Architecture-specific MM context */ 207 mm_context_t context; 208 209 /* Swap token stuff */ 210 /* 211 * Last value of global fault stamp as seen by this process. 212 * In other words, this value gives an indication of how long 213 * it has been since this task got the token. 214 * Look at mm/thrash.c 215 */ 216 unsigned int faultstamp; 217 unsigned int token_priority; 218 unsigned int last_interval; 219 220 unsigned long flags; /* Must use atomic bitops to access the bits */ 221 222 /* coredumping support */ 223 struct completion *core_startup_done, core_done; 224 225 /* aio bits */ 226 rwlock_t ioctx_list_lock; /* aio lock */ 227 struct kioctx *ioctx_list; 228#ifdef CONFIG_MM_OWNER 229 /* 230 * "owner" points to a task that is regarded as the canonical 231 * user/owner of this mm. All of the following must be true in 232 * order for it to be changed: 233 * 234 * current == mm->owner 235 * current->mm != mm 236 * new_owner->mm == mm 237 * new_owner->alloc_lock is held 238 */ 239 struct task_struct *owner; 240#endif 241 242#ifdef CONFIG_PROC_FS 243 /* store ref to file /proc/<pid>/exe symlink points to */ 244 struct file *exe_file; 245 unsigned long num_exe_file_vmas; 246#endif 247}; 248 249#endif /* _LINUX_MM_TYPES_H */ 250