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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 <linux/page-debug-flags.h> | |
15 | #include <asm/page.h> | |
16 | #include <asm/mmu.h> | |
17 | ||
18 | #ifndef AT_VECTOR_SIZE_ARCH | |
19 | #define AT_VECTOR_SIZE_ARCH 0 | |
20 | #endif | |
21 | #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1)) | |
22 | ||
23 | struct address_space; | |
24 | ||
25 | #define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS) | |
26 | ||
27 | /* | |
28 | * Each physical page in the system has a struct page associated with | |
29 | * it to keep track of whatever it is we are using the page for at the | |
30 | * moment. Note that we have no way to track which tasks are using | |
31 | * a page, though if it is a pagecache page, rmap structures can tell us | |
32 | * who is mapping it. | |
33 | */ | |
34 | struct page { | |
35 | unsigned long flags; /* Atomic flags, some possibly | |
36 | * updated asynchronously */ | |
37 | atomic_t _count; /* Usage count, see below. */ | |
38 | union { | |
39 | atomic_t _mapcount; /* Count of ptes mapped in mms, | |
40 | * to show when page is mapped | |
41 | * & limit reverse map searches. | |
42 | */ | |
43 | struct { /* SLUB */ | |
44 | u16 inuse; | |
45 | u16 objects; | |
46 | }; | |
47 | }; | |
48 | union { | |
49 | struct { | |
50 | unsigned long private; /* Mapping-private opaque data: | |
51 | * usually used for buffer_heads | |
52 | * if PagePrivate set; used for | |
53 | * swp_entry_t if PageSwapCache; | |
54 | * indicates order in the buddy | |
55 | * system if PG_buddy is set. | |
56 | */ | |
57 | struct address_space *mapping; /* If low bit clear, points to | |
58 | * inode address_space, or NULL. | |
59 | * If page mapped as anonymous | |
60 | * memory, low bit is set, and | |
61 | * it points to anon_vma object: | |
62 | * see PAGE_MAPPING_ANON below. | |
63 | */ | |
64 | }; | |
65 | #if USE_SPLIT_PTLOCKS | |
66 | spinlock_t ptl; | |
67 | #endif | |
68 | struct kmem_cache *slab; /* SLUB: Pointer to slab */ | |
69 | struct page *first_page; /* Compound tail pages */ | |
70 | }; | |
71 | union { | |
72 | pgoff_t index; /* Our offset within mapping. */ | |
73 | void *freelist; /* SLUB: freelist req. slab lock */ | |
74 | }; | |
75 | struct list_head lru; /* Pageout list, eg. active_list | |
76 | * protected by zone->lru_lock ! | |
77 | */ | |
78 | /* | |
79 | * On machines where all RAM is mapped into kernel address space, | |
80 | * we can simply calculate the virtual address. On machines with | |
81 | * highmem some memory is mapped into kernel virtual memory | |
82 | * dynamically, so we need a place to store that address. | |
83 | * Note that this field could be 16 bits on x86 ... ;) | |
84 | * | |
85 | * Architectures with slow multiplication can define | |
86 | * WANT_PAGE_VIRTUAL in asm/page.h | |
87 | */ | |
88 | #if defined(WANT_PAGE_VIRTUAL) | |
89 | void *virtual; /* Kernel virtual address (NULL if | |
90 | not kmapped, ie. highmem) */ | |
91 | #endif /* WANT_PAGE_VIRTUAL */ | |
92 | #ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS | |
93 | unsigned long debug_flags; /* Use atomic bitops on this */ | |
94 | #endif | |
95 | ||
96 | #ifdef CONFIG_KMEMCHECK | |
97 | /* | |
98 | * kmemcheck wants to track the status of each byte in a page; this | |
99 | * is a pointer to such a status block. NULL if not tracked. | |
100 | */ | |
101 | void *shadow; | |
102 | #endif | |
103 | }; | |
104 | ||
105 | /* | |
106 | * A region containing a mapping of a non-memory backed file under NOMMU | |
107 | * conditions. These are held in a global tree and are pinned by the VMAs that | |
108 | * map parts of them. | |
109 | */ | |
110 | struct vm_region { | |
111 | struct rb_node vm_rb; /* link in global region tree */ | |
112 | unsigned long vm_flags; /* VMA vm_flags */ | |
113 | unsigned long vm_start; /* start address of region */ | |
114 | unsigned long vm_end; /* region initialised to here */ | |
115 | unsigned long vm_top; /* region allocated to here */ | |
116 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ | |
117 | struct file *vm_file; /* the backing file or NULL */ | |
118 | ||
119 | int vm_usage; /* region usage count (access under nommu_region_sem) */ | |
120 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for | |
121 | * this region */ | |
122 | }; | |
123 | ||
124 | /* | |
125 | * This struct defines a memory VMM memory area. There is one of these | |
126 | * per VM-area/task. A VM area is any part of the process virtual memory | |
127 | * space that has a special rule for the page-fault handlers (ie a shared | |
128 | * library, the executable area etc). | |
129 | */ | |
130 | struct vm_area_struct { | |
131 | struct mm_struct * vm_mm; /* The address space we belong to. */ | |
132 | unsigned long vm_start; /* Our start address within vm_mm. */ | |
133 | unsigned long vm_end; /* The first byte after our end address | |
134 | within vm_mm. */ | |
135 | ||
136 | /* linked list of VM areas per task, sorted by address */ | |
137 | struct vm_area_struct *vm_next, *vm_prev; | |
138 | ||
139 | pgprot_t vm_page_prot; /* Access permissions of this VMA. */ | |
140 | unsigned long vm_flags; /* Flags, see mm.h. */ | |
141 | ||
142 | struct rb_node vm_rb; | |
143 | ||
144 | /* | |
145 | * For areas with an address space and backing store, | |
146 | * linkage into the address_space->i_mmap prio tree, or | |
147 | * linkage to the list of like vmas hanging off its node, or | |
148 | * linkage of vma in the address_space->i_mmap_nonlinear list. | |
149 | */ | |
150 | union { | |
151 | struct { | |
152 | struct list_head list; | |
153 | void *parent; /* aligns with prio_tree_node parent */ | |
154 | struct vm_area_struct *head; | |
155 | } vm_set; | |
156 | ||
157 | struct raw_prio_tree_node prio_tree_node; | |
158 | } shared; | |
159 | ||
160 | /* | |
161 | * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma | |
162 | * list, after a COW of one of the file pages. A MAP_SHARED vma | |
163 | * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack | |
164 | * or brk vma (with NULL file) can only be in an anon_vma list. | |
165 | */ | |
166 | struct list_head anon_vma_chain; /* Serialized by mmap_sem & | |
167 | * page_table_lock */ | |
168 | struct anon_vma *anon_vma; /* Serialized by page_table_lock */ | |
169 | ||
170 | /* Function pointers to deal with this struct. */ | |
171 | const struct vm_operations_struct *vm_ops; | |
172 | ||
173 | /* Information about our backing store: */ | |
174 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE | |
175 | units, *not* PAGE_CACHE_SIZE */ | |
176 | struct file * vm_file; /* File we map to (can be NULL). */ | |
177 | void * vm_private_data; /* was vm_pte (shared mem) */ | |
178 | unsigned long vm_truncate_count;/* truncate_count or restart_addr */ | |
179 | ||
180 | #ifndef CONFIG_MMU | |
181 | struct vm_region *vm_region; /* NOMMU mapping region */ | |
182 | #endif | |
183 | #ifdef CONFIG_NUMA | |
184 | struct mempolicy *vm_policy; /* NUMA policy for the VMA */ | |
185 | #endif | |
186 | }; | |
187 | ||
188 | struct core_thread { | |
189 | struct task_struct *task; | |
190 | struct core_thread *next; | |
191 | }; | |
192 | ||
193 | struct core_state { | |
194 | atomic_t nr_threads; | |
195 | struct core_thread dumper; | |
196 | struct completion startup; | |
197 | }; | |
198 | ||
199 | enum { | |
200 | MM_FILEPAGES, | |
201 | MM_ANONPAGES, | |
202 | MM_SWAPENTS, | |
203 | NR_MM_COUNTERS | |
204 | }; | |
205 | ||
206 | #if USE_SPLIT_PTLOCKS && defined(CONFIG_MMU) | |
207 | #define SPLIT_RSS_COUNTING | |
208 | struct mm_rss_stat { | |
209 | atomic_long_t count[NR_MM_COUNTERS]; | |
210 | }; | |
211 | /* per-thread cached information, */ | |
212 | struct task_rss_stat { | |
213 | int events; /* for synchronization threshold */ | |
214 | int count[NR_MM_COUNTERS]; | |
215 | }; | |
216 | #else /* !USE_SPLIT_PTLOCKS */ | |
217 | struct mm_rss_stat { | |
218 | unsigned long count[NR_MM_COUNTERS]; | |
219 | }; | |
220 | #endif /* !USE_SPLIT_PTLOCKS */ | |
221 | ||
222 | struct mm_struct { | |
223 | struct vm_area_struct * mmap; /* list of VMAs */ | |
224 | struct rb_root mm_rb; | |
225 | struct vm_area_struct * mmap_cache; /* last find_vma result */ | |
226 | #ifdef CONFIG_MMU | |
227 | unsigned long (*get_unmapped_area) (struct file *filp, | |
228 | unsigned long addr, unsigned long len, | |
229 | unsigned long pgoff, unsigned long flags); | |
230 | void (*unmap_area) (struct mm_struct *mm, unsigned long addr); | |
231 | #endif | |
232 | unsigned long mmap_base; /* base of mmap area */ | |
233 | unsigned long task_size; /* size of task vm space */ | |
234 | unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */ | |
235 | unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */ | |
236 | pgd_t * pgd; | |
237 | atomic_t mm_users; /* How many users with user space? */ | |
238 | atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ | |
239 | int map_count; /* number of VMAs */ | |
240 | struct rw_semaphore mmap_sem; | |
241 | spinlock_t page_table_lock; /* Protects page tables and some counters */ | |
242 | ||
243 | struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung | |
244 | * together off init_mm.mmlist, and are protected | |
245 | * by mmlist_lock | |
246 | */ | |
247 | ||
248 | ||
249 | unsigned long hiwater_rss; /* High-watermark of RSS usage */ | |
250 | unsigned long hiwater_vm; /* High-water virtual memory usage */ | |
251 | ||
252 | unsigned long total_vm, locked_vm, shared_vm, exec_vm; | |
253 | unsigned long stack_vm, reserved_vm, def_flags, nr_ptes; | |
254 | unsigned long start_code, end_code, start_data, end_data; | |
255 | unsigned long start_brk, brk, start_stack; | |
256 | unsigned long arg_start, arg_end, env_start, env_end; | |
257 | ||
258 | unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */ | |
259 | ||
260 | /* | |
261 | * Special counters, in some configurations protected by the | |
262 | * page_table_lock, in other configurations by being atomic. | |
263 | */ | |
264 | struct mm_rss_stat rss_stat; | |
265 | ||
266 | struct linux_binfmt *binfmt; | |
267 | ||
268 | cpumask_t cpu_vm_mask; | |
269 | ||
270 | /* Architecture-specific MM context */ | |
271 | mm_context_t context; | |
272 | ||
273 | /* Swap token stuff */ | |
274 | /* | |
275 | * Last value of global fault stamp as seen by this process. | |
276 | * In other words, this value gives an indication of how long | |
277 | * it has been since this task got the token. | |
278 | * Look at mm/thrash.c | |
279 | */ | |
280 | unsigned int faultstamp; | |
281 | unsigned int token_priority; | |
282 | unsigned int last_interval; | |
283 | ||
284 | unsigned long flags; /* Must use atomic bitops to access the bits */ | |
285 | ||
286 | struct core_state *core_state; /* coredumping support */ | |
287 | #ifdef CONFIG_AIO | |
288 | spinlock_t ioctx_lock; | |
289 | struct hlist_head ioctx_list; | |
290 | #endif | |
291 | #ifdef CONFIG_MM_OWNER | |
292 | /* | |
293 | * "owner" points to a task that is regarded as the canonical | |
294 | * user/owner of this mm. All of the following must be true in | |
295 | * order for it to be changed: | |
296 | * | |
297 | * current == mm->owner | |
298 | * current->mm != mm | |
299 | * new_owner->mm == mm | |
300 | * new_owner->alloc_lock is held | |
301 | */ | |
302 | struct task_struct *owner; | |
303 | #endif | |
304 | ||
305 | #ifdef CONFIG_PROC_FS | |
306 | /* store ref to file /proc/<pid>/exe symlink points to */ | |
307 | struct file *exe_file; | |
308 | unsigned long num_exe_file_vmas; | |
309 | #endif | |
310 | #ifdef CONFIG_MMU_NOTIFIER | |
311 | struct mmu_notifier_mm *mmu_notifier_mm; | |
312 | #endif | |
313 | }; | |
314 | ||
315 | /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */ | |
316 | #define mm_cpumask(mm) (&(mm)->cpu_vm_mask) | |
317 | ||
318 | #endif /* _LINUX_MM_TYPES_H */ |