Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_MM_TYPES_H |
| 2 | #define _LINUX_MM_TYPES_H |
| 3 | |
Olaf Hering | 4f9a58d | 2007-10-16 23:30:12 -0700 | [diff] [blame^] | 4 | #include <linux/auxvec.h> |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 5 | #include <linux/types.h> |
| 6 | #include <linux/threads.h> |
| 7 | #include <linux/list.h> |
| 8 | #include <linux/spinlock.h> |
Martin Schwidefsky | c92ff1b | 2007-10-16 01:24:43 -0700 | [diff] [blame] | 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> |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 15 | |
Olaf Hering | 4f9a58d | 2007-10-16 23:30:12 -0700 | [diff] [blame^] | 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 | |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 21 | struct address_space; |
| 22 | |
Martin Schwidefsky | c92ff1b | 2007-10-16 01:24:43 -0700 | [diff] [blame] | 23 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
| 24 | typedef atomic_long_t mm_counter_t; |
| 25 | #else /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ |
| 26 | typedef unsigned long mm_counter_t; |
| 27 | #endif /* NR_CPUS < CONFIG_SPLIT_PTLOCK_CPUS */ |
| 28 | |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 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 | */ |
| 36 | struct page { |
| 37 | unsigned long flags; /* Atomic flags, some possibly |
| 38 | * updated asynchronously */ |
| 39 | atomic_t _count; /* Usage count, see below. */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 40 | union { |
| 41 | atomic_t _mapcount; /* Count of ptes mapped in mms, |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 42 | * to show when page is mapped |
| 43 | * & limit reverse map searches. |
| 44 | */ |
Christoph Lameter | b3fba8d | 2007-10-16 01:26:06 -0700 | [diff] [blame] | 45 | unsigned int inuse; /* SLUB: Nr of objects */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 46 | }; |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 47 | union { |
| 48 | struct { |
| 49 | unsigned long private; /* Mapping-private opaque data: |
| 50 | * usually used for buffer_heads |
| 51 | * if PagePrivate set; used for |
| 52 | * swp_entry_t if PageSwapCache; |
| 53 | * indicates order in the buddy |
| 54 | * system if PG_buddy is set. |
| 55 | */ |
| 56 | struct address_space *mapping; /* If low bit clear, points to |
| 57 | * inode address_space, or NULL. |
| 58 | * If page mapped as anonymous |
| 59 | * memory, low bit is set, and |
| 60 | * it points to anon_vma object: |
| 61 | * see PAGE_MAPPING_ANON below. |
| 62 | */ |
| 63 | }; |
| 64 | #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS |
| 65 | spinlock_t ptl; |
| 66 | #endif |
Christoph Lameter | 8e65d24 | 2007-10-16 01:26:06 -0700 | [diff] [blame] | 67 | struct kmem_cache *slab; /* SLUB: Pointer to slab */ |
| 68 | struct page *first_page; /* Compound tail pages */ |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 69 | }; |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 70 | union { |
| 71 | pgoff_t index; /* Our offset within mapping. */ |
Christoph Lameter | 894b878 | 2007-05-10 03:15:16 -0700 | [diff] [blame] | 72 | void *freelist; /* SLUB: freelist req. slab lock */ |
Christoph Lameter | 81819f0 | 2007-05-06 14:49:36 -0700 | [diff] [blame] | 73 | }; |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 74 | struct list_head lru; /* Pageout list, eg. active_list |
| 75 | * protected by zone->lru_lock ! |
| 76 | */ |
| 77 | /* |
| 78 | * On machines where all RAM is mapped into kernel address space, |
| 79 | * we can simply calculate the virtual address. On machines with |
| 80 | * highmem some memory is mapped into kernel virtual memory |
| 81 | * dynamically, so we need a place to store that address. |
| 82 | * Note that this field could be 16 bits on x86 ... ;) |
| 83 | * |
| 84 | * Architectures with slow multiplication can define |
| 85 | * WANT_PAGE_VIRTUAL in asm/page.h |
| 86 | */ |
| 87 | #if defined(WANT_PAGE_VIRTUAL) |
| 88 | void *virtual; /* Kernel virtual address (NULL if |
| 89 | not kmapped, ie. highmem) */ |
| 90 | #endif /* WANT_PAGE_VIRTUAL */ |
| 91 | }; |
| 92 | |
Martin Schwidefsky | c92ff1b | 2007-10-16 01:24:43 -0700 | [diff] [blame] | 93 | /* |
| 94 | * This struct defines a memory VMM memory area. There is one of these |
| 95 | * per VM-area/task. A VM area is any part of the process virtual memory |
| 96 | * space that has a special rule for the page-fault handlers (ie a shared |
| 97 | * library, the executable area etc). |
| 98 | */ |
| 99 | struct vm_area_struct { |
| 100 | struct mm_struct * vm_mm; /* The address space we belong to. */ |
| 101 | unsigned long vm_start; /* Our start address within vm_mm. */ |
| 102 | unsigned long vm_end; /* The first byte after our end address |
| 103 | within vm_mm. */ |
| 104 | |
| 105 | /* linked list of VM areas per task, sorted by address */ |
| 106 | struct vm_area_struct *vm_next; |
| 107 | |
| 108 | pgprot_t vm_page_prot; /* Access permissions of this VMA. */ |
| 109 | unsigned long vm_flags; /* Flags, listed below. */ |
| 110 | |
| 111 | struct rb_node vm_rb; |
| 112 | |
| 113 | /* |
| 114 | * For areas with an address space and backing store, |
| 115 | * linkage into the address_space->i_mmap prio tree, or |
| 116 | * linkage to the list of like vmas hanging off its node, or |
| 117 | * linkage of vma in the address_space->i_mmap_nonlinear list. |
| 118 | */ |
| 119 | union { |
| 120 | struct { |
| 121 | struct list_head list; |
| 122 | void *parent; /* aligns with prio_tree_node parent */ |
| 123 | struct vm_area_struct *head; |
| 124 | } vm_set; |
| 125 | |
| 126 | struct raw_prio_tree_node prio_tree_node; |
| 127 | } shared; |
| 128 | |
| 129 | /* |
| 130 | * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma |
| 131 | * list, after a COW of one of the file pages. A MAP_SHARED vma |
| 132 | * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack |
| 133 | * or brk vma (with NULL file) can only be in an anon_vma list. |
| 134 | */ |
| 135 | struct list_head anon_vma_node; /* Serialized by anon_vma->lock */ |
| 136 | struct anon_vma *anon_vma; /* Serialized by page_table_lock */ |
| 137 | |
| 138 | /* Function pointers to deal with this struct. */ |
| 139 | struct vm_operations_struct * vm_ops; |
| 140 | |
| 141 | /* Information about our backing store: */ |
| 142 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE |
| 143 | units, *not* PAGE_CACHE_SIZE */ |
| 144 | struct file * vm_file; /* File we map to (can be NULL). */ |
| 145 | void * vm_private_data; /* was vm_pte (shared mem) */ |
| 146 | unsigned long vm_truncate_count;/* truncate_count or restart_addr */ |
| 147 | |
| 148 | #ifndef CONFIG_MMU |
| 149 | atomic_t vm_usage; /* refcount (VMAs shared if !MMU) */ |
| 150 | #endif |
| 151 | #ifdef CONFIG_NUMA |
| 152 | struct mempolicy *vm_policy; /* NUMA policy for the VMA */ |
| 153 | #endif |
| 154 | }; |
| 155 | |
| 156 | struct mm_struct { |
| 157 | struct vm_area_struct * mmap; /* list of VMAs */ |
| 158 | struct rb_root mm_rb; |
| 159 | struct vm_area_struct * mmap_cache; /* last find_vma result */ |
| 160 | unsigned long (*get_unmapped_area) (struct file *filp, |
| 161 | unsigned long addr, unsigned long len, |
| 162 | unsigned long pgoff, unsigned long flags); |
| 163 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); |
| 164 | unsigned long mmap_base; /* base of mmap area */ |
| 165 | unsigned long task_size; /* size of task vm space */ |
| 166 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ |
| 167 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ |
| 168 | pgd_t * pgd; |
| 169 | atomic_t mm_users; /* How many users with user space? */ |
| 170 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ |
| 171 | int map_count; /* number of VMAs */ |
| 172 | struct rw_semaphore mmap_sem; |
| 173 | spinlock_t page_table_lock; /* Protects page tables and some counters */ |
| 174 | |
| 175 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung |
| 176 | * together off init_mm.mmlist, and are protected |
| 177 | * by mmlist_lock |
| 178 | */ |
| 179 | |
| 180 | /* Special counters, in some configurations protected by the |
| 181 | * page_table_lock, in other configurations by being atomic. |
| 182 | */ |
| 183 | mm_counter_t _file_rss; |
| 184 | mm_counter_t _anon_rss; |
| 185 | |
| 186 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ |
| 187 | unsigned long hiwater_vm; /* High-water virtual memory usage */ |
| 188 | |
| 189 | unsigned long total_vm, locked_vm, shared_vm, exec_vm; |
| 190 | unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; |
| 191 | unsigned long start_code, end_code, start_data, end_data; |
| 192 | unsigned long start_brk, brk, start_stack; |
| 193 | unsigned long arg_start, arg_end, env_start, env_end; |
| 194 | |
| 195 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ |
| 196 | |
| 197 | cpumask_t cpu_vm_mask; |
| 198 | |
| 199 | /* Architecture-specific MM context */ |
| 200 | mm_context_t context; |
| 201 | |
| 202 | /* Swap token stuff */ |
| 203 | /* |
| 204 | * Last value of global fault stamp as seen by this process. |
| 205 | * In other words, this value gives an indication of how long |
| 206 | * it has been since this task got the token. |
| 207 | * Look at mm/thrash.c |
| 208 | */ |
| 209 | unsigned int faultstamp; |
| 210 | unsigned int token_priority; |
| 211 | unsigned int last_interval; |
| 212 | |
| 213 | unsigned long flags; /* Must use atomic bitops to access the bits */ |
| 214 | |
| 215 | /* coredumping support */ |
| 216 | int core_waiters; |
| 217 | struct completion *core_startup_done, core_done; |
| 218 | |
| 219 | /* aio bits */ |
| 220 | rwlock_t ioctx_list_lock; |
| 221 | struct kioctx *ioctx_list; |
| 222 | }; |
| 223 | |
Heiko Carstens | 5b99cd0 | 2006-09-27 01:50:01 -0700 | [diff] [blame] | 224 | #endif /* _LINUX_MM_TYPES_H */ |