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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; |
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 */ |
319 |
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