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 <linux/cpumask.h> 14 #include <asm/page.h> 15 #include <asm/mmu.h> 16 17 #ifndef AT_VECTOR_SIZE_ARCH 18 #define AT_VECTOR_SIZE_ARCH 0 19 #endif 20 #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) 21 22 struct address_space; 23 24 #define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS) 25 26 #if USE_SPLIT_PTLOCKS 27 typedef atomic_long_t mm_counter_t; 28 #else /* !USE_SPLIT_PTLOCKS */ 29 typedef unsigned long mm_counter_t; 30 #endif /* !USE_SPLIT_PTLOCKS */ 31 32 /* 33 * Each physical page in the system has a struct page associated with 34 * it to keep track of whatever it is we are using the page for at the 35 * moment. Note that we have no way to track which tasks are using 36 * a page, though if it is a pagecache page, rmap structures can tell us 37 * who is mapping it. 38 */ 39 struct page { 40 unsigned long flags; /* Atomic flags, some possibly 41 * updated asynchronously */ 42 atomic_t _count; /* Usage count, see below. */ 43 union { 44 atomic_t _mapcount; /* Count of ptes mapped in mms, 45 * to show when page is mapped 46 * & limit reverse map searches. 47 */ 48 struct { /* SLUB */ 49 u16 inuse; 50 u16 objects; 51 }; 52 }; 53 union { 54 struct { 55 unsigned long private; /* Mapping-private opaque data: 56 * usually used for buffer_heads 57 * if PagePrivate set; used for 58 * swp_entry_t if PageSwapCache; 59 * indicates order in the buddy 60 * system if PG_buddy is set. 61 */ 62 struct address_space *mapping; /* If low bit clear, points to 63 * inode address_space, or NULL. 64 * If page mapped as anonymous 65 * memory, low bit is set, and 66 * it points to anon_vma object: 67 * see PAGE_MAPPING_ANON below. 68 */ 69 }; 70 #if USE_SPLIT_PTLOCKS 71 spinlock_t ptl; 72 #endif 73 struct kmem_cache *slab; /* SLUB: Pointer to slab */ 74 struct page *first_page; /* Compound tail pages */ 75 }; 76 union { 77 pgoff_t index; /* Our offset within mapping. */ 78 void *freelist; /* SLUB: freelist req. slab lock */ 79 }; 80 struct list_head lru; /* Pageout list, eg. active_list 81 * protected by zone->lru_lock ! 82 */ 83 /* 84 * On machines where all RAM is mapped into kernel address space, 85 * we can simply calculate the virtual address. On machines with 86 * highmem some memory is mapped into kernel virtual memory 87 * dynamically, so we need a place to store that address. 88 * Note that this field could be 16 bits on x86 ... ;) 89 * 90 * Architectures with slow multiplication can define 91 * WANT_PAGE_VIRTUAL in asm/page.h 92 */ 93 #if defined(WANT_PAGE_VIRTUAL) 94 void *virtual; /* Kernel virtual address (NULL if 95 not kmapped, ie. highmem) */ 96 #endif /* WANT_PAGE_VIRTUAL */ 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 */ 105 struct 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, see mm.h. */ 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 }; 161 162 struct core_thread { 163 struct task_struct *task; 164 struct core_thread *next; 165 }; 166 167 struct core_state { 168 atomic_t nr_threads; 169 struct core_thread dumper; 170 struct completion startup; 171 }; 172 173 struct mm_struct { 174 struct vm_area_struct * mmap; /* list of VMAs */ 175 struct rb_root mm_rb; 176 struct vm_area_struct * mmap_cache; /* last find_vma result */ 177 unsigned long (*get_unmapped_area) (struct file *filp, 178 unsigned long addr, unsigned long len, 179 unsigned long pgoff, unsigned long flags); 180 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 181 unsigned long mmap_base; /* base of mmap area */ 182 unsigned long task_size; /* size of task vm space */ 183 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 184 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 185 pgd_t * pgd; 186 atomic_t mm_users; /* How many users with user space? */ 187 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 188 int map_count; /* number of VMAs */ 189 struct rw_semaphore mmap_sem; 190 spinlock_t page_table_lock; /* Protects page tables and some counters */ 191 192 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 193 * together off init_mm.mmlist, and are protected 194 * by mmlist_lock 195 */ 196 197 /* Special counters, in some configurations protected by the 198 * page_table_lock, in other configurations by being atomic. 199 */ 200 mm_counter_t _file_rss; 201 mm_counter_t _anon_rss; 202 203 unsigned long hiwater_rss; /* High-watermark of RSS usage */ 204 unsigned long hiwater_vm; /* High-water virtual memory usage */ 205 206 unsigned long total_vm, locked_vm, shared_vm, exec_vm; 207 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; 208 unsigned long start_code, end_code, start_data, end_data; 209 unsigned long start_brk, brk, start_stack; 210 unsigned long arg_start, arg_end, env_start, env_end; 211 212 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 213 214 cpumask_t cpu_vm_mask; 215 216 /* Architecture-specific MM context */ 217 mm_context_t context; 218 219 /* Swap token stuff */ 220 /* 221 * Last value of global fault stamp as seen by this process. 222 * In other words, this value gives an indication of how long 223 * it has been since this task got the token. 224 * Look at mm/thrash.c 225 */ 226 unsigned int faultstamp; 227 unsigned int token_priority; 228 unsigned int last_interval; 229 230 unsigned long flags; /* Must use atomic bitops to access the bits */ 231 232 struct core_state *core_state; /* coredumping support */ 233 234 /* aio bits */ 235 rwlock_t ioctx_list_lock; /* aio lock */ 236 struct kioctx *ioctx_list; 237 #ifdef CONFIG_MM_OWNER 238 /* 239 * "owner" points to a task that is regarded as the canonical 240 * user/owner of this mm. All of the following must be true in 241 * order for it to be changed: 242 * 243 * current == mm->owner 244 * current->mm != mm 245 * new_owner->mm == mm 246 * new_owner->alloc_lock is held 247 */ 248 struct task_struct *owner; 249 #endif 250 251 #ifdef CONFIG_PROC_FS 252 /* store ref to file /proc/<pid>/exe symlink points to */ 253 struct file *exe_file; 254 unsigned long num_exe_file_vmas; 255 #endif 256 #ifdef CONFIG_MMU_NOTIFIER 257 struct mmu_notifier_mm *mmu_notifier_mm; 258 #endif 259 }; 260 261 #endif /* _LINUX_MM_TYPES_H */ 262