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5b99cd0e HC |
1 | #ifndef _LINUX_MM_TYPES_H |
2 | #define _LINUX_MM_TYPES_H | |
3 | ||
4f9a58d7 | 4 | #include <linux/auxvec.h> |
5b99cd0e HC |
5 | #include <linux/types.h> |
6 | #include <linux/threads.h> | |
7 | #include <linux/list.h> | |
8 | #include <linux/spinlock.h> | |
c92ff1bd MS |
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> | |
5b99cd0e | 15 | |
4f9a58d7 OH |
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 | ||
5b99cd0e HC |
21 | struct address_space; |
22 | ||
c92ff1bd MS |
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 | ||
5b99cd0e HC |
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. */ | |
81819f0f CL |
40 | union { |
41 | atomic_t _mapcount; /* Count of ptes mapped in mms, | |
5b99cd0e HC |
42 | * to show when page is mapped |
43 | * & limit reverse map searches. | |
44 | */ | |
39b26464 CL |
45 | struct { /* SLUB */ |
46 | u16 inuse; | |
47 | u16 objects; | |
48 | }; | |
81819f0f | 49 | }; |
5b99cd0e HC |
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 | |
a973e9dd | 70 | struct kmem_cache *slab; /* SLUB: Pointer to slab */ |
8e65d24c | 71 | struct page *first_page; /* Compound tail pages */ |
81819f0f CL |
72 | }; |
73 | union { | |
74 | pgoff_t index; /* Our offset within mapping. */ | |
894b8788 | 75 | void *freelist; /* SLUB: freelist req. slab lock */ |
5b99cd0e | 76 | }; |
5b99cd0e HC |
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 */ | |
00f0b825 | 94 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR |
78fb7466 PE |
95 | unsigned long page_cgroup; |
96 | #endif | |
5b99cd0e HC |
97 | }; |
98 | ||
c92ff1bd MS |
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, 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 | ||
32ecb1f2 ON |
162 | struct core_state { |
163 | struct completion startup; | |
164 | }; | |
165 | ||
c92ff1bd MS |
166 | struct mm_struct { |
167 | struct vm_area_struct * mmap; /* list of VMAs */ | |
168 | struct rb_root mm_rb; | |
169 | struct vm_area_struct * mmap_cache; /* last find_vma result */ | |
170 | unsigned long (*get_unmapped_area) (struct file *filp, | |
171 | unsigned long addr, unsigned long len, | |
172 | unsigned long pgoff, unsigned long flags); | |
173 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); | |
174 | unsigned long mmap_base; /* base of mmap area */ | |
175 | unsigned long task_size; /* size of task vm space */ | |
176 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ | |
177 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ | |
178 | pgd_t * pgd; | |
179 | atomic_t mm_users; /* How many users with user space? */ | |
180 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ | |
181 | int map_count; /* number of VMAs */ | |
7edf85aa | 182 | int core_waiters; |
c92ff1bd MS |
183 | struct rw_semaphore mmap_sem; |
184 | spinlock_t page_table_lock; /* Protects page tables and some counters */ | |
185 | ||
186 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung | |
187 | * together off init_mm.mmlist, and are protected | |
188 | * by mmlist_lock | |
189 | */ | |
190 | ||
191 | /* Special counters, in some configurations protected by the | |
192 | * page_table_lock, in other configurations by being atomic. | |
193 | */ | |
194 | mm_counter_t _file_rss; | |
195 | mm_counter_t _anon_rss; | |
196 | ||
197 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ | |
198 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
199 | ||
200 | unsigned long total_vm, locked_vm, shared_vm, exec_vm; | |
201 | unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; | |
202 | unsigned long start_code, end_code, start_data, end_data; | |
203 | unsigned long start_brk, brk, start_stack; | |
204 | unsigned long arg_start, arg_end, env_start, env_end; | |
205 | ||
206 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ | |
207 | ||
208 | cpumask_t cpu_vm_mask; | |
209 | ||
210 | /* Architecture-specific MM context */ | |
211 | mm_context_t context; | |
212 | ||
213 | /* Swap token stuff */ | |
214 | /* | |
215 | * Last value of global fault stamp as seen by this process. | |
216 | * In other words, this value gives an indication of how long | |
217 | * it has been since this task got the token. | |
218 | * Look at mm/thrash.c | |
219 | */ | |
220 | unsigned int faultstamp; | |
221 | unsigned int token_priority; | |
222 | unsigned int last_interval; | |
223 | ||
224 | unsigned long flags; /* Must use atomic bitops to access the bits */ | |
225 | ||
226 | /* coredumping support */ | |
32ecb1f2 ON |
227 | struct core_state *core_state; |
228 | struct completion core_done; | |
c92ff1bd MS |
229 | |
230 | /* aio bits */ | |
7edf85aa | 231 | rwlock_t ioctx_list_lock; /* aio lock */ |
c92ff1bd | 232 | struct kioctx *ioctx_list; |
cf475ad2 | 233 | #ifdef CONFIG_MM_OWNER |
4cd1a8fc KM |
234 | /* |
235 | * "owner" points to a task that is regarded as the canonical | |
236 | * user/owner of this mm. All of the following must be true in | |
237 | * order for it to be changed: | |
238 | * | |
239 | * current == mm->owner | |
240 | * current->mm != mm | |
241 | * new_owner->mm == mm | |
242 | * new_owner->alloc_lock is held | |
243 | */ | |
244 | struct task_struct *owner; | |
78fb7466 | 245 | #endif |
925d1c40 MH |
246 | |
247 | #ifdef CONFIG_PROC_FS | |
248 | /* store ref to file /proc/<pid>/exe symlink points to */ | |
249 | struct file *exe_file; | |
250 | unsigned long num_exe_file_vmas; | |
251 | #endif | |
c92ff1bd MS |
252 | }; |
253 | ||
5b99cd0e | 254 | #endif /* _LINUX_MM_TYPES_H */ |