Linux kernel mirror (for testing)
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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 <asm/page.h>
15#include <asm/mmu.h>
16
17#ifndef AT_VECTOR_SIZE_ARCH
18#define AT_VECTOR_SIZE_ARCH 0
19#endif
20#define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
21
22struct address_space;
23
24#define USE_SPLIT_PTLOCKS (NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS)
25
26#if USE_SPLIT_PTLOCKS
27typedef atomic_long_t mm_counter_t;
28#else /* !USE_SPLIT_PTLOCKS */
29typedef unsigned long mm_counter_t;
30#endif /* !USE_SPLIT_PTLOCKS */
31
32/*
33 * Each physical page in the system has a struct page associated with
34 * it to keep track of whatever it is we are using the page for at the
35 * moment. Note that we have no way to track which tasks are using
36 * a page, though if it is a pagecache page, rmap structures can tell us
37 * who is mapping it.
38 */
39struct page {
40 unsigned long flags; /* Atomic flags, some possibly
41 * updated asynchronously */
42 atomic_t _count; /* Usage count, see below. */
43 union {
44 atomic_t _mapcount; /* Count of ptes mapped in mms,
45 * to show when page is mapped
46 * & limit reverse map searches.
47 */
48 struct { /* SLUB */
49 u16 inuse;
50 u16 objects;
51 };
52 };
53 union {
54 struct {
55 unsigned long private; /* Mapping-private opaque data:
56 * usually used for buffer_heads
57 * if PagePrivate set; used for
58 * swp_entry_t if PageSwapCache;
59 * indicates order in the buddy
60 * system if PG_buddy is set.
61 */
62 struct address_space *mapping; /* If low bit clear, points to
63 * inode address_space, or NULL.
64 * If page mapped as anonymous
65 * memory, low bit is set, and
66 * it points to anon_vma object:
67 * see PAGE_MAPPING_ANON below.
68 */
69 };
70#if USE_SPLIT_PTLOCKS
71 spinlock_t ptl;
72#endif
73 struct kmem_cache *slab; /* SLUB: Pointer to slab */
74 struct page *first_page; /* Compound tail pages */
75 };
76 union {
77 pgoff_t index; /* Our offset within mapping. */
78 void *freelist; /* SLUB: freelist req. slab lock */
79 };
80 struct list_head lru; /* Pageout list, eg. active_list
81 * protected by zone->lru_lock !
82 */
83 /*
84 * On machines where all RAM is mapped into kernel address space,
85 * we can simply calculate the virtual address. On machines with
86 * highmem some memory is mapped into kernel virtual memory
87 * dynamically, so we need a place to store that address.
88 * Note that this field could be 16 bits on x86 ... ;)
89 *
90 * Architectures with slow multiplication can define
91 * WANT_PAGE_VIRTUAL in asm/page.h
92 */
93#if defined(WANT_PAGE_VIRTUAL)
94 void *virtual; /* Kernel virtual address (NULL if
95 not kmapped, ie. highmem) */
96#endif /* WANT_PAGE_VIRTUAL */
97};
98
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 */
105struct 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, see mm.h. */
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
162struct core_thread {
163 struct task_struct *task;
164 struct core_thread *next;
165};
166
167struct core_state {
168 atomic_t nr_threads;
169 struct core_thread dumper;
170 struct completion startup;
171};
172
173struct mm_struct {
174 struct vm_area_struct * mmap; /* list of VMAs */
175 struct rb_root mm_rb;
176 struct vm_area_struct * mmap_cache; /* last find_vma result */
177 unsigned long (*get_unmapped_area) (struct file *filp,
178 unsigned long addr, unsigned long len,
179 unsigned long pgoff, unsigned long flags);
180 void (*unmap_area) (struct mm_struct *mm, unsigned long addr);
181 unsigned long mmap_base; /* base of mmap area */
182 unsigned long task_size; /* size of task vm space */
183 unsigned long cached_hole_size; /* if non-zero, the largest hole below free_area_cache */
184 unsigned long free_area_cache; /* first hole of size cached_hole_size or larger */
185 pgd_t * pgd;
186 atomic_t mm_users; /* How many users with user space? */
187 atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */
188 int map_count; /* number of VMAs */
189 struct rw_semaphore mmap_sem;
190 spinlock_t page_table_lock; /* Protects page tables and some counters */
191
192 struct list_head mmlist; /* List of maybe swapped mm's. These are globally strung
193 * together off init_mm.mmlist, and are protected
194 * by mmlist_lock
195 */
196
197 /* Special counters, in some configurations protected by the
198 * page_table_lock, in other configurations by being atomic.
199 */
200 mm_counter_t _file_rss;
201 mm_counter_t _anon_rss;
202
203 unsigned long hiwater_rss; /* High-watermark of RSS usage */
204 unsigned long hiwater_vm; /* High-water virtual memory usage */
205
206 unsigned long total_vm, locked_vm, shared_vm, exec_vm;
207 unsigned long stack_vm, reserved_vm, def_flags, nr_ptes;
208 unsigned long start_code, end_code, start_data, end_data;
209 unsigned long start_brk, brk, start_stack;
210 unsigned long arg_start, arg_end, env_start, env_end;
211
212 unsigned long saved_auxv[AT_VECTOR_SIZE]; /* for /proc/PID/auxv */
213
214 cpumask_t cpu_vm_mask;
215
216 /* Architecture-specific MM context */
217 mm_context_t context;
218
219 /* Swap token stuff */
220 /*
221 * Last value of global fault stamp as seen by this process.
222 * In other words, this value gives an indication of how long
223 * it has been since this task got the token.
224 * Look at mm/thrash.c
225 */
226 unsigned int faultstamp;
227 unsigned int token_priority;
228 unsigned int last_interval;
229
230 unsigned long flags; /* Must use atomic bitops to access the bits */
231
232 struct core_state *core_state; /* coredumping support */
233
234 /* aio bits */
235 rwlock_t ioctx_list_lock; /* aio lock */
236 struct kioctx *ioctx_list;
237#ifdef CONFIG_MM_OWNER
238 /*
239 * "owner" points to a task that is regarded as the canonical
240 * user/owner of this mm. All of the following must be true in
241 * order for it to be changed:
242 *
243 * current == mm->owner
244 * current->mm != mm
245 * new_owner->mm == mm
246 * new_owner->alloc_lock is held
247 */
248 struct task_struct *owner;
249#endif
250
251#ifdef CONFIG_PROC_FS
252 /* store ref to file /proc/<pid>/exe symlink points to */
253 struct file *exe_file;
254 unsigned long num_exe_file_vmas;
255#endif
256#ifdef CONFIG_MMU_NOTIFIER
257 struct mmu_notifier_mm *mmu_notifier_mm;
258#endif
259};
260
261#endif /* _LINUX_MM_TYPES_H */