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1 | #ifndef _LINUX_MEMPOLICY_H |
2 | #define _LINUX_MEMPOLICY_H 1 | |
3 | ||
4 | #include <linux/errno.h> | |
5 | ||
6 | /* | |
7 | * NUMA memory policies for Linux. | |
8 | * Copyright 2003,2004 Andi Kleen SuSE Labs | |
9 | */ | |
10 | ||
11 | /* Policies */ | |
12 | #define MPOL_DEFAULT 0 | |
13 | #define MPOL_PREFERRED 1 | |
14 | #define MPOL_BIND 2 | |
15 | #define MPOL_INTERLEAVE 3 | |
16 | ||
17 | #define MPOL_MAX MPOL_INTERLEAVE | |
18 | ||
19 | /* Flags for get_mem_policy */ | |
20 | #define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */ | |
21 | #define MPOL_F_ADDR (1<<1) /* look up vma using address */ | |
22 | ||
23 | /* Flags for mbind */ | |
24 | #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */ | |
25 | ||
26 | #ifdef __KERNEL__ | |
27 | ||
28 | #include <linux/config.h> | |
29 | #include <linux/mmzone.h> | |
30 | #include <linux/bitmap.h> | |
31 | #include <linux/slab.h> | |
32 | #include <linux/rbtree.h> | |
33 | #include <linux/spinlock.h> | |
34 | ||
35 | struct vm_area_struct; | |
36 | ||
37 | #ifdef CONFIG_NUMA | |
38 | ||
39 | /* | |
40 | * Describe a memory policy. | |
41 | * | |
42 | * A mempolicy can be either associated with a process or with a VMA. | |
43 | * For VMA related allocations the VMA policy is preferred, otherwise | |
44 | * the process policy is used. Interrupts ignore the memory policy | |
45 | * of the current process. | |
46 | * | |
47 | * Locking policy for interlave: | |
48 | * In process context there is no locking because only the process accesses | |
49 | * its own state. All vma manipulation is somewhat protected by a down_read on | |
50 | * mmap_sem. For allocating in the interleave policy the page_table_lock | |
51 | * must be also aquired to protect il_next. | |
52 | * | |
53 | * Freeing policy: | |
54 | * When policy is MPOL_BIND v.zonelist is kmalloc'ed and must be kfree'd. | |
55 | * All other policies don't have any external state. mpol_free() handles this. | |
56 | * | |
57 | * Copying policy objects: | |
58 | * For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this. | |
59 | */ | |
60 | struct mempolicy { | |
61 | atomic_t refcnt; | |
62 | short policy; /* See MPOL_* above */ | |
63 | union { | |
64 | struct zonelist *zonelist; /* bind */ | |
65 | short preferred_node; /* preferred */ | |
66 | DECLARE_BITMAP(nodes, MAX_NUMNODES); /* interleave */ | |
67 | /* undefined for default */ | |
68 | } v; | |
69 | }; | |
70 | ||
71 | /* | |
72 | * Support for managing mempolicy data objects (clone, copy, destroy) | |
73 | * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. | |
74 | */ | |
75 | ||
76 | extern void __mpol_free(struct mempolicy *pol); | |
77 | static inline void mpol_free(struct mempolicy *pol) | |
78 | { | |
79 | if (pol) | |
80 | __mpol_free(pol); | |
81 | } | |
82 | ||
83 | extern struct mempolicy *__mpol_copy(struct mempolicy *pol); | |
84 | static inline struct mempolicy *mpol_copy(struct mempolicy *pol) | |
85 | { | |
86 | if (pol) | |
87 | pol = __mpol_copy(pol); | |
88 | return pol; | |
89 | } | |
90 | ||
91 | #define vma_policy(vma) ((vma)->vm_policy) | |
92 | #define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol)) | |
93 | ||
94 | static inline void mpol_get(struct mempolicy *pol) | |
95 | { | |
96 | if (pol) | |
97 | atomic_inc(&pol->refcnt); | |
98 | } | |
99 | ||
100 | extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b); | |
101 | static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
102 | { | |
103 | if (a == b) | |
104 | return 1; | |
105 | return __mpol_equal(a, b); | |
106 | } | |
107 | #define vma_mpol_equal(a,b) mpol_equal(vma_policy(a), vma_policy(b)) | |
108 | ||
109 | /* Could later add inheritance of the process policy here. */ | |
110 | ||
111 | #define mpol_set_vma_default(vma) ((vma)->vm_policy = NULL) | |
112 | ||
113 | /* | |
114 | * Hugetlb policy. i386 hugetlb so far works with node numbers | |
115 | * instead of zone lists, so give it special interfaces for now. | |
116 | */ | |
117 | extern int mpol_first_node(struct vm_area_struct *vma, unsigned long addr); | |
118 | extern int mpol_node_valid(int nid, struct vm_area_struct *vma, | |
119 | unsigned long addr); | |
120 | ||
121 | /* | |
122 | * Tree of shared policies for a shared memory region. | |
123 | * Maintain the policies in a pseudo mm that contains vmas. The vmas | |
124 | * carry the policy. As a special twist the pseudo mm is indexed in pages, not | |
125 | * bytes, so that we can work with shared memory segments bigger than | |
126 | * unsigned long. | |
127 | */ | |
128 | ||
129 | struct sp_node { | |
130 | struct rb_node nd; | |
131 | unsigned long start, end; | |
132 | struct mempolicy *policy; | |
133 | }; | |
134 | ||
135 | struct shared_policy { | |
136 | struct rb_root root; | |
137 | spinlock_t lock; | |
138 | }; | |
139 | ||
140 | static inline void mpol_shared_policy_init(struct shared_policy *info) | |
141 | { | |
142 | info->root = RB_ROOT; | |
143 | spin_lock_init(&info->lock); | |
144 | } | |
145 | ||
146 | int mpol_set_shared_policy(struct shared_policy *info, | |
147 | struct vm_area_struct *vma, | |
148 | struct mempolicy *new); | |
149 | void mpol_free_shared_policy(struct shared_policy *p); | |
150 | struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, | |
151 | unsigned long idx); | |
152 | ||
6e21c8f1 CL |
153 | struct mempolicy *get_vma_policy(struct task_struct *task, |
154 | struct vm_area_struct *vma, unsigned long addr); | |
155 | ||
1da177e4 LT |
156 | extern void numa_default_policy(void); |
157 | extern void numa_policy_init(void); | |
158 | ||
159 | #else | |
160 | ||
161 | struct mempolicy {}; | |
162 | ||
163 | static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
164 | { | |
165 | return 1; | |
166 | } | |
167 | #define vma_mpol_equal(a,b) 1 | |
168 | ||
169 | #define mpol_set_vma_default(vma) do {} while(0) | |
170 | ||
171 | static inline void mpol_free(struct mempolicy *p) | |
172 | { | |
173 | } | |
174 | ||
175 | static inline void mpol_get(struct mempolicy *pol) | |
176 | { | |
177 | } | |
178 | ||
179 | static inline struct mempolicy *mpol_copy(struct mempolicy *old) | |
180 | { | |
181 | return NULL; | |
182 | } | |
183 | ||
184 | static inline int mpol_first_node(struct vm_area_struct *vma, unsigned long a) | |
185 | { | |
186 | return numa_node_id(); | |
187 | } | |
188 | ||
189 | static inline int | |
190 | mpol_node_valid(int nid, struct vm_area_struct *vma, unsigned long a) | |
191 | { | |
192 | return 1; | |
193 | } | |
194 | ||
195 | struct shared_policy {}; | |
196 | ||
197 | static inline int mpol_set_shared_policy(struct shared_policy *info, | |
198 | struct vm_area_struct *vma, | |
199 | struct mempolicy *new) | |
200 | { | |
201 | return -EINVAL; | |
202 | } | |
203 | ||
204 | static inline void mpol_shared_policy_init(struct shared_policy *info) | |
205 | { | |
206 | } | |
207 | ||
208 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
209 | { | |
210 | } | |
211 | ||
212 | static inline struct mempolicy * | |
213 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
214 | { | |
215 | return NULL; | |
216 | } | |
217 | ||
218 | #define vma_policy(vma) NULL | |
219 | #define vma_set_policy(vma, pol) do {} while(0) | |
220 | ||
221 | static inline void numa_policy_init(void) | |
222 | { | |
223 | } | |
224 | ||
225 | static inline void numa_default_policy(void) | |
226 | { | |
227 | } | |
228 | ||
229 | #endif /* CONFIG_NUMA */ | |
230 | #endif /* __KERNEL__ */ | |
231 | ||
232 | #endif |