Line data Source code
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 : #if USE_SPLIT_PTLOCKS
28 1 : typedef atomic_long_t mm_counter_t;
29 6 : #else /* !USE_SPLIT_PTLOCKS */
30 : typedef unsigned long mm_counter_t;
31 : #endif /* !USE_SPLIT_PTLOCKS */
32 :
33 : /*
34 : * Each physical page in the system has a struct page associated with
35 : * it to keep track of whatever it is we are using the page for at the
36 : * moment. Note that we have no way to track which tasks are using
37 : * a page, though if it is a pagecache page, rmap structures can tell us
38 : * who is mapping it.
39 : */
40 : struct page {
41 : unsigned long flags; /* Atomic flags, some possibly
42 : * updated asynchronously */
43 : atomic_t _count; /* Usage count, see below. */
44 : union {
45 : atomic_t _mapcount; /* Count of ptes mapped in mms,
46 : * to show when page is mapped
47 : * & limit reverse map searches.
48 : */
49 : struct { /* SLUB */
50 : u16 inuse;
51 : u16 objects;
52 : };
53 : };
54 : union {
55 : struct {
56 : unsigned long private; /* Mapping-private opaque data:
57 : * usually used for buffer_heads
58 : * if PagePrivate set; used for
59 : * swp_entry_t if PageSwapCache;
60 : * indicates order in the buddy
61 : * system if PG_buddy is set.
62 : */
63 : struct address_space *mapping; /* If low bit clear, points to
64 : * inode address_space, or NULL.
65 : * If page mapped as anonymous
66 : * memory, low bit is set, and
67 : * it points to anon_vma object:
68 : * see PAGE_MAPPING_ANON below.
69 : */
70 : };
71 : #if USE_SPLIT_PTLOCKS
72 : spinlock_t ptl;
73 : #endif
74 : struct kmem_cache *slab; /* SLUB: Pointer to slab */
75 : struct page *first_page; /* Compound tail pages */
76 : };
77 : union {
78 : pgoff_t index; /* Our offset within mapping. */
79 : void *freelist; /* SLUB: freelist req. slab lock */
80 : };
81 : struct list_head lru; /* Pageout list, eg. active_list
82 : * protected by zone->lru_lock !
83 : */
84 : /*
85 : * On machines where all RAM is mapped into kernel address space,
86 : * we can simply calculate the virtual address. On machines with
87 : * highmem some memory is mapped into kernel virtual memory
88 : * dynamically, so we need a place to store that address.
89 : * Note that this field could be 16 bits on x86 ... ;)
90 : *
91 : * Architectures with slow multiplication can define
92 : * WANT_PAGE_VIRTUAL in asm/page.h
93 : */
94 : #if defined(WANT_PAGE_VIRTUAL)
95 : void *virtual; /* Kernel virtual address (NULL if
96 : not kmapped, ie. highmem) */
97 : #endif /* WANT_PAGE_VIRTUAL */
98 : #ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
99 : unsigned long debug_flags; /* Use atomic bitops on this */
100 : #endif
101 :
102 : #ifdef CONFIG_KMEMCHECK
103 : /*
104 : * kmemcheck wants to track the status of each byte in a page; this
105 : * is a pointer to such a status block. NULL if not tracked.
106 : */
107 : void *shadow;
108 : #endif
109 : };
110 :
111 : /*
112 : * A region containing a mapping of a non-memory backed file under NOMMU
113 : * conditions. These are held in a global tree and are pinned by the VMAs that
114 : * map parts of them.
115 : */
116 : struct vm_region {
117 : struct rb_node vm_rb; /* link in global region tree */
118 : unsigned long vm_flags; /* VMA vm_flags */
119 : unsigned long vm_start; /* start address of region */
120 : unsigned long vm_end; /* region initialised to here */
121 : unsigned long vm_top; /* region allocated to here */
122 : unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */
123 : struct file *vm_file; /* the backing file or NULL */
124 :
125 : int vm_usage; /* region usage count (access under nommu_region_sem) */
126 : bool vm_icache_flushed : 1; /* true if the icache has been flushed for
127 : * this region */
128 6 : };
129 :
130 : /*
131 : * This struct defines a memory VMM memory area. There is one of these
132 : * per VM-area/task. A VM area is any part of the process virtual memory
133 : * space that has a special rule for the page-fault handlers (ie a shared
134 : * library, the executable area etc).
135 : */
136 : struct vm_area_struct {
137 : struct mm_struct * vm_mm; /* The address space we belong to. */
138 : unsigned long vm_start; /* Our start address within vm_mm. */
139 : unsigned long vm_end; /* The first byte after our end address
140 : within vm_mm. */
141 :
142 : /* linked list of VM areas per task, sorted by address */
143 : struct vm_area_struct *vm_next;
144 :
145 : pgprot_t vm_page_prot; /* Access permissions of this VMA. */
146 : unsigned long vm_flags; /* Flags, see mm.h. */
147 :
148 : struct rb_node vm_rb;
149 :
150 : /*
151 : * For areas with an address space and backing store,
152 : * linkage into the address_space->i_mmap prio tree, or
153 : * linkage to the list of like vmas hanging off its node, or
154 : * linkage of vma in the address_space->i_mmap_nonlinear list.
155 : */
156 : union {
157 : struct {
158 : struct list_head list;
159 : void *parent; /* aligns with prio_tree_node parent */
160 : struct vm_area_struct *head;
161 : } vm_set;
162 :
163 : struct raw_prio_tree_node prio_tree_node;
164 : } shared;
165 :
166 : /*
167 : * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
168 : * list, after a COW of one of the file pages. A MAP_SHARED vma
169 : * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
170 : * or brk vma (with NULL file) can only be in an anon_vma list.
171 : */
172 : struct list_head anon_vma_node; /* Serialized by anon_vma->lock */
173 : struct anon_vma *anon_vma; /* Serialized by page_table_lock */
174 :
175 : /* Function pointers to deal with this struct. */
176 : const struct vm_operations_struct *vm_ops;
177 :
178 : /* Information about our backing store: */
179 : unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE
180 : units, *not* PAGE_CACHE_SIZE */
181 : struct file * vm_file; /* File we map to (can be NULL). */
182 : void * vm_private_data; /* was vm_pte (shared mem) */
183 : unsigned long vm_truncate_count;/* truncate_count or restart_addr */
184 :
185 : #ifndef CONFIG_MMU
186 : struct vm_region *vm_region; /* NOMMU mapping region */
187 : #endif
188 : #ifdef CONFIG_NUMA
189 : struct mempolicy *vm_policy; /* NUMA policy for the VMA */
190 : #endif
191 1 : };
192 :
193 : struct core_thread {
194 : struct task_struct *task;
195 : struct core_thread *next;
196 : };
197 1 :
198 : struct core_state {
199 : atomic_t nr_threads;
200 : struct core_thread dumper;
201 : struct completion startup;
202 : };
203 2 :
204 : struct mm_struct {
205 : struct vm_area_struct * mmap; /* list of VMAs */
206 : struct rb_root mm_rb;
207 : struct vm_area_struct * mmap_cache; /* last find_vma result */
208 : #ifdef CONFIG_MMU
209 : unsigned long (*get_unmapped_area) (struct file *filp,
210 : unsigned long addr, unsigned long len,
211 : unsigned long pgoff, unsigned long flags);
212 : void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
213 : #endif
214 : unsigned long mmap_base; /* base of mmap area */
215 : unsigned long task_size; /* size of task vm space */
216 : unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
217 : unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
218 : pgd_t * pgd;
219 : atomic_t mm_users; /* How many users with user space? */
220 : atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
221 : int map_count; /* number of VMAs */
222 : struct rw_semaphore mmap_sem;
223 : spinlock_t page_table_lock; /* Protects page tables and some counters */
224 :
225 : struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
226 : * together off init_mm.mmlist, and are protected
227 : * by mmlist_lock
228 : */
229 :
230 : /* Special counters, in some configurations protected by the
231 : * page_table_lock, in other configurations by being atomic.
232 : */
233 : mm_counter_t _file_rss;
234 : mm_counter_t _anon_rss;
235 :
236 : unsigned long hiwater_rss; /* High-watermark of RSS usage */
237 : unsigned long hiwater_vm; /* High-water virtual memory usage */
238 :
239 : unsigned long total_vm, locked_vm, shared_vm, exec_vm;
240 : unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
241 : unsigned long start_code, end_code, start_data, end_data;
242 : unsigned long start_brk, brk, start_stack;
243 : unsigned long arg_start, arg_end, env_start, env_end;
244 :
245 : unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
246 :
247 : struct linux_binfmt *binfmt;
248 :
249 : cpumask_t cpu_vm_mask;
250 :
251 : /* Architecture-specific MM context */
252 : mm_context_t context;
253 :
254 : /* Swap token stuff */
255 : /*
256 : * Last value of global fault stamp as seen by this process.
257 : * In other words, this value gives an indication of how long
258 : * it has been since this task got the token.
259 : * Look at mm/thrash.c
260 : */
261 : unsigned int faultstamp;
262 : unsigned int token_priority;
263 : unsigned int last_interval;
264 :
265 : unsigned long flags; /* Must use atomic bitops to access the bits */
266 :
267 : struct core_state *core_state; /* coredumping support */
268 : #ifdef CONFIG_AIO
269 : spinlock_t ioctx_lock;
270 : struct hlist_head ioctx_list;
271 : #endif
272 : #ifdef CONFIG_MM_OWNER
273 : /*
274 : * "owner" points to a task that is regarded as the canonical
275 : * user/owner of this mm. All of the following must be true in
276 : * order for it to be changed:
277 : *
278 : * current == mm->owner
279 : * current->mm != mm
280 : * new_owner->mm == mm
281 : * new_owner->alloc_lock is held
282 : */
283 : struct task_struct *owner;
284 : #endif
285 :
286 : #ifdef CONFIG_PROC_FS
287 : /* store ref to file /proc/<pid>/exe symlink points to */
288 : struct file *exe_file;
289 : unsigned long num_exe_file_vmas;
290 : #endif
291 : #ifdef CONFIG_MMU_NOTIFIER
292 : struct mmu_notifier_mm *mmu_notifier_mm;
293 : #endif
294 : };
295 :
296 : /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
297 : #define mm_cpumask(mm) (&(mm)->cpu_vm_mask)
298 :
299 : #endif /* _LINUX_MM_TYPES_H */
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