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 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 25 typedef atomic_long_t mm_counter_t; 26 #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 27 typedef unsigned long mm_counter_t; 28 #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ 29 30 /* 31 * Each physical page in the system has a struct page associated with 32 * it to keep track of whatever it is we are using the page for at the 33 * moment. Note that we have no way to track which tasks are using 34 * a page, though if it is a pagecache page, rmap structures can tell us 35 * who is mapping it. 36 */ 37 struct page { 38 unsigned long flags; /* Atomic flags, some possibly 39 * updated asynchronously */ 40 atomic_t _count; /* Usage count, see below. */ 41 union { 42 atomic_t _mapcount; /* Count of ptes mapped in mms, 43 * to show when page is mapped 44 * & limit reverse map searches. 45 */ 46 struct { /* SLUB */ 47 u16 inuse; 48 u16 objects; 49 }; 50 }; 51 union { 52 struct { 53 unsigned long private; /* Mapping-private opaque data: 54 * usually used for buffer_heads 55 * if PagePrivate set; used for 56 * swp_entry_t if PageSwapCache; 57 * indicates order in the buddy 58 * system if PG_buddy is set. 59 */ 60 struct address_space *mapping; /* If low bit clear, points to 61 * inode address_space, or NULL. 62 * If page mapped as anonymous 63 * memory, low bit is set, and 64 * it points to anon_vma object: 65 * see PAGE_MAPPING_ANON below. 66 */ 67 }; 68 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS 69 spinlock_t ptl; 70 #endif 71 struct kmem_cache *slab; /* SLUB: Pointer to slab */ 72 struct page *first_page; /* Compound tail pages */ 73 }; 74 union { 75 pgoff_t index; /* Our offset within mapping. */ 76 void *freelist; /* SLUB: freelist req. slab lock */ 77 }; 78 struct list_head lru; /* Pageout list, eg. active_list 79 * protected by zone->lru_lock ! 80 */ 81 /* 82 * On machines where all RAM is mapped into kernel address space, 83 * we can simply calculate the virtual address. On machines with 84 * highmem some memory is mapped into kernel virtual memory 85 * dynamically, so we need a place to store that address. 86 * Note that this field could be 16 bits on x86 ... ;) 87 * 88 * Architectures with slow multiplication can define 89 * WANT_PAGE_VIRTUAL in asm/page.h 90 */ 91 #if defined(WANT_PAGE_VIRTUAL) 92 void *virtual; /* Kernel virtual address (NULL if 93 not kmapped, ie. highmem) */ 94 #endif /* WANT_PAGE_VIRTUAL */ 95 #ifdef CONFIG_CGROUP_MEM_RES_CTLR 96 unsigned long page_cgroup; 97 #endif 98 }; 99 100 /* 101 * This struct defines a memory VMM memory area. There is one of these 102 * per VM-area/task. A VM area is any part of the process virtual memory 103 * space that has a special rule for the page-fault handlers (ie a shared 104 * library, the executable area etc). 105 */ 106 struct vm_area_struct { 107 struct mm_struct * vm_mm; /* The address space we belong to. */ 108 unsigned long vm_start; /* Our start address within vm_mm. */ 109 unsigned long vm_end; /* The first byte after our end address 110 within vm_mm. */ 111 112 /* linked list of VM areas per task, sorted by address */ 113 struct vm_area_struct *vm_next; 114 115 pgprot_t vm_page_prot; /* Access permissions of this VMA. */ 116 unsigned long vm_flags; /* Flags, listed below. */ 117 118 struct rb_node vm_rb; 119 120 /* 121 * For areas with an address space and backing store, 122 * linkage into the address_space->i_mmap prio tree, or 123 * linkage to the list of like vmas hanging off its node, or 124 * linkage of vma in the address_space->i_mmap_nonlinear list. 125 */ 126 union { 127 struct { 128 struct list_head list; 129 void *parent; /* aligns with prio_tree_node parent */ 130 struct vm_area_struct *head; 131 } vm_set; 132 133 struct raw_prio_tree_node prio_tree_node; 134 } shared; 135 136 /* 137 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma 138 * list, after a COW of one of the file pages. A MAP_SHARED vma 139 * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack 140 * or brk vma (with NULL file) can only be in an anon_vma list. 141 */ 142 struct list_head anon_vma_node; /* Serialized by anon_vma->lock */ 143 struct anon_vma *anon_vma; /* Serialized by page_table_lock */ 144 145 /* Function pointers to deal with this struct. */ 146 struct vm_operations_struct * vm_ops; 147 148 /* Information about our backing store: */ 149 unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE 150 units, *not* PAGE_CACHE_SIZE */ 151 struct file * vm_file; /* File we map to (can be NULL). */ 152 void * vm_private_data; /* was vm_pte (shared mem) */ 153 unsigned long vm_truncate_count;/* truncate_count or restart_addr */ 154 155 #ifndef CONFIG_MMU 156 atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */ 157 #endif 158 #ifdef CONFIG_NUMA 159 struct mempolicy *vm_policy; /* NUMA policy for the VMA */ 160 #endif 161 }; 162 163 struct core_thread { 164 struct task_struct *task; 165 struct core_thread *next; 166 }; 167 168 struct core_state { 169 atomic_t nr_threads; 170 struct core_thread dumper; 171 struct completion startup; 172 }; 173 174 struct mm_struct { 175 struct vm_area_struct * mmap; /* list of VMAs */ 176 struct rb_root mm_rb; 177 struct vm_area_struct * mmap_cache; /* last find_vma result */ 178 unsigned long (*get_unmapped_area) (struct file *filp, 179 unsigned long addr, unsigned long len, 180 unsigned long pgoff, unsigned long flags); 181 void (*unmap_area) (struct mm_struct *mm, unsigned long addr); 182 unsigned long mmap_base; /* base of mmap area */ 183 unsigned long task_size; /* size of task vm space */ 184 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ 185 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ 186 pgd_t * pgd; 187 atomic_t mm_users; /* How many users with user space? */ 188 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ 189 int map_count; /* number of VMAs */ 190 struct rw_semaphore mmap_sem; 191 spinlock_t page_table_lock; /* Protects page tables and some counters */ 192 193 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung 194 * together off init_mm.mmlist, and are protected 195 * by mmlist_lock 196 */ 197 198 /* Special counters, in some configurations protected by the 199 * page_table_lock, in other configurations by being atomic. 200 */ 201 mm_counter_t _file_rss; 202 mm_counter_t _anon_rss; 203 204 unsigned long hiwater_rss; /* High-watermark of RSS usage */ 205 unsigned long hiwater_vm; /* High-water virtual memory usage */ 206 207 unsigned long total_vm, locked_vm, shared_vm, exec_vm; 208 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; 209 unsigned long start_code, end_code, start_data, end_data; 210 unsigned long start_brk, brk, start_stack; 211 unsigned long arg_start, arg_end, env_start, env_end; 212 213 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ 214 215 cpumask_t cpu_vm_mask; 216 217 /* Architecture-specific MM context */ 218 mm_context_t context; 219 220 /* Swap token stuff */ 221 /* 222 * Last value of global fault stamp as seen by this process. 223 * In other words, this value gives an indication of how long 224 * it has been since this task got the token. 225 * Look at mm/thrash.c 226 */ 227 unsigned int faultstamp; 228 unsigned int token_priority; 229 unsigned int last_interval; 230 231 unsigned long flags; /* Must use atomic bitops to access the bits */ 232 233 struct core_state *core_state; /* coredumping support */ 234 235 /* aio bits */ 236 rwlock_t ioctx_list_lock; /* aio lock */ 237 struct kioctx *ioctx_list; 238 #ifdef CONFIG_MM_OWNER 239 /* 240 * "owner" points to a task that is regarded as the canonical 241 * user/owner of this mm. All of the following must be true in 242 * order for it to be changed: 243 * 244 * current == mm->owner 245 * current->mm != mm 246 * new_owner->mm == mm 247 * new_owner->alloc_lock is held 248 */ 249 struct task_struct *owner; 250 #endif 251 252 #ifdef CONFIG_PROC_FS 253 /* store ref to file /proc/<pid>/exe symlink points to */ 254 struct file *exe_file; 255 unsigned long num_exe_file_vmas; 256 #endif 257 #ifdef CONFIG_MMU_NOTIFIER 258 struct mmu_notifier_mm *mmu_notifier_mm; 259 #endif 260 }; 261 262 #endif /* _LINUX_MM_TYPES_H */ 263