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