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1da177e4 LT |
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> | |
1da177e4 LT |
30 | #include <linux/slab.h> |
31 | #include <linux/rbtree.h> | |
32 | #include <linux/spinlock.h> | |
dfcd3c0d | 33 | #include <linux/nodemask.h> |
1da177e4 LT |
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 | |
b8072f09 | 50 | * mmap_sem. |
1da177e4 LT |
51 | * |
52 | * Freeing policy: | |
53 | * When policy is MPOL_BIND v.zonelist is kmalloc'ed and must be kfree'd. | |
54 | * All other policies don't have any external state. mpol_free() handles this. | |
55 | * | |
56 | * Copying policy objects: | |
57 | * For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this. | |
58 | */ | |
59 | struct mempolicy { | |
60 | atomic_t refcnt; | |
61 | short policy; /* See MPOL_* above */ | |
62 | union { | |
63 | struct zonelist *zonelist; /* bind */ | |
64 | short preferred_node; /* preferred */ | |
dfcd3c0d | 65 | nodemask_t nodes; /* interleave */ |
1da177e4 LT |
66 | /* undefined for default */ |
67 | } v; | |
68 | }; | |
69 | ||
70 | /* | |
71 | * Support for managing mempolicy data objects (clone, copy, destroy) | |
72 | * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. | |
73 | */ | |
74 | ||
75 | extern void __mpol_free(struct mempolicy *pol); | |
76 | static inline void mpol_free(struct mempolicy *pol) | |
77 | { | |
78 | if (pol) | |
79 | __mpol_free(pol); | |
80 | } | |
81 | ||
82 | extern struct mempolicy *__mpol_copy(struct mempolicy *pol); | |
83 | static inline struct mempolicy *mpol_copy(struct mempolicy *pol) | |
84 | { | |
85 | if (pol) | |
86 | pol = __mpol_copy(pol); | |
87 | return pol; | |
88 | } | |
89 | ||
90 | #define vma_policy(vma) ((vma)->vm_policy) | |
91 | #define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol)) | |
92 | ||
93 | static inline void mpol_get(struct mempolicy *pol) | |
94 | { | |
95 | if (pol) | |
96 | atomic_inc(&pol->refcnt); | |
97 | } | |
98 | ||
99 | extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b); | |
100 | static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
101 | { | |
102 | if (a == b) | |
103 | return 1; | |
104 | return __mpol_equal(a, b); | |
105 | } | |
106 | #define vma_mpol_equal(a,b) mpol_equal(vma_policy(a), vma_policy(b)) | |
107 | ||
108 | /* Could later add inheritance of the process policy here. */ | |
109 | ||
110 | #define mpol_set_vma_default(vma) ((vma)->vm_policy = NULL) | |
111 | ||
1da177e4 LT |
112 | /* |
113 | * Tree of shared policies for a shared memory region. | |
114 | * Maintain the policies in a pseudo mm that contains vmas. The vmas | |
115 | * carry the policy. As a special twist the pseudo mm is indexed in pages, not | |
116 | * bytes, so that we can work with shared memory segments bigger than | |
117 | * unsigned long. | |
118 | */ | |
119 | ||
120 | struct sp_node { | |
121 | struct rb_node nd; | |
122 | unsigned long start, end; | |
123 | struct mempolicy *policy; | |
124 | }; | |
125 | ||
126 | struct shared_policy { | |
127 | struct rb_root root; | |
128 | spinlock_t lock; | |
129 | }; | |
130 | ||
131 | static inline void mpol_shared_policy_init(struct shared_policy *info) | |
132 | { | |
133 | info->root = RB_ROOT; | |
134 | spin_lock_init(&info->lock); | |
135 | } | |
136 | ||
137 | int mpol_set_shared_policy(struct shared_policy *info, | |
138 | struct vm_area_struct *vma, | |
139 | struct mempolicy *new); | |
140 | void mpol_free_shared_policy(struct shared_policy *p); | |
141 | struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, | |
142 | unsigned long idx); | |
143 | ||
6e21c8f1 CL |
144 | struct mempolicy *get_vma_policy(struct task_struct *task, |
145 | struct vm_area_struct *vma, unsigned long addr); | |
146 | ||
1da177e4 LT |
147 | extern void numa_default_policy(void); |
148 | extern void numa_policy_init(void); | |
68860ec1 | 149 | extern void numa_policy_rebind(const nodemask_t *old, const nodemask_t *new); |
d42c6997 | 150 | extern struct mempolicy default_policy; |
5da7ca86 CL |
151 | extern struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
152 | unsigned long addr); | |
1da177e4 LT |
153 | |
154 | #else | |
155 | ||
156 | struct mempolicy {}; | |
157 | ||
158 | static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
159 | { | |
160 | return 1; | |
161 | } | |
162 | #define vma_mpol_equal(a,b) 1 | |
163 | ||
164 | #define mpol_set_vma_default(vma) do {} while(0) | |
165 | ||
166 | static inline void mpol_free(struct mempolicy *p) | |
167 | { | |
168 | } | |
169 | ||
170 | static inline void mpol_get(struct mempolicy *pol) | |
171 | { | |
172 | } | |
173 | ||
174 | static inline struct mempolicy *mpol_copy(struct mempolicy *old) | |
175 | { | |
176 | return NULL; | |
177 | } | |
178 | ||
1da177e4 LT |
179 | struct shared_policy {}; |
180 | ||
181 | static inline int mpol_set_shared_policy(struct shared_policy *info, | |
182 | struct vm_area_struct *vma, | |
183 | struct mempolicy *new) | |
184 | { | |
185 | return -EINVAL; | |
186 | } | |
187 | ||
188 | static inline void mpol_shared_policy_init(struct shared_policy *info) | |
189 | { | |
190 | } | |
191 | ||
192 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
193 | { | |
194 | } | |
195 | ||
196 | static inline struct mempolicy * | |
197 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
198 | { | |
199 | return NULL; | |
200 | } | |
201 | ||
202 | #define vma_policy(vma) NULL | |
203 | #define vma_set_policy(vma, pol) do {} while(0) | |
204 | ||
205 | static inline void numa_policy_init(void) | |
206 | { | |
207 | } | |
208 | ||
209 | static inline void numa_default_policy(void) | |
210 | { | |
211 | } | |
212 | ||
68860ec1 PJ |
213 | static inline void numa_policy_rebind(const nodemask_t *old, |
214 | const nodemask_t *new) | |
215 | { | |
216 | } | |
217 | ||
5da7ca86 CL |
218 | static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
219 | unsigned long addr) | |
220 | { | |
221 | return NODE_DATA(0)->node_zonelists + gfp_zone(GFP_HIGHUSER); | |
222 | } | |
223 | ||
1da177e4 LT |
224 | #endif /* CONFIG_NUMA */ |
225 | #endif /* __KERNEL__ */ | |
226 | ||
227 | #endif |