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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 | ||
028fec41 DR |
11 | /* |
12 | * Both the MPOL_* mempolicy mode and the MPOL_F_* optional mode flags are | |
13 | * passed by the user to either set_mempolicy() or mbind() in an 'int' actual. | |
14 | * The MPOL_MODE_FLAGS macro determines the legal set of optional mode flags. | |
15 | */ | |
16 | ||
1da177e4 | 17 | /* Policies */ |
a3b51e01 DR |
18 | enum { |
19 | MPOL_DEFAULT, | |
20 | MPOL_PREFERRED, | |
21 | MPOL_BIND, | |
22 | MPOL_INTERLEAVE, | |
23 | MPOL_MAX, /* always last member of enum */ | |
24 | }; | |
1da177e4 | 25 | |
028fec41 | 26 | /* Flags for set_mempolicy */ |
f5b087b5 | 27 | #define MPOL_F_STATIC_NODES (1 << 15) |
4c50bc01 | 28 | #define MPOL_F_RELATIVE_NODES (1 << 14) |
f5b087b5 | 29 | |
028fec41 DR |
30 | /* |
31 | * MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to | |
32 | * either set_mempolicy() or mbind(). | |
33 | */ | |
4c50bc01 | 34 | #define MPOL_MODE_FLAGS (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES) |
028fec41 DR |
35 | |
36 | /* Flags for get_mempolicy */ | |
1da177e4 LT |
37 | #define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */ |
38 | #define MPOL_F_ADDR (1<<1) /* look up vma using address */ | |
754af6f5 | 39 | #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */ |
1da177e4 LT |
40 | |
41 | /* Flags for mbind */ | |
42 | #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */ | |
dc9aa5b9 CL |
43 | #define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform to mapping */ |
44 | #define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to mapping */ | |
45 | #define MPOL_MF_INTERNAL (1<<3) /* Internal flags start here */ | |
1da177e4 | 46 | |
aab0b102 LS |
47 | /* |
48 | * Internal flags that share the struct mempolicy flags word with | |
49 | * "mode flags". These flags are allocated from bit 0 up, as they | |
50 | * are never OR'ed into the mode in mempolicy API arguments. | |
51 | */ | |
52 | #define MPOL_F_SHARED (1 << 0) /* identify shared policies */ | |
53 | ||
1da177e4 LT |
54 | #ifdef __KERNEL__ |
55 | ||
1da177e4 | 56 | #include <linux/mmzone.h> |
1da177e4 LT |
57 | #include <linux/slab.h> |
58 | #include <linux/rbtree.h> | |
59 | #include <linux/spinlock.h> | |
dfcd3c0d | 60 | #include <linux/nodemask.h> |
1da177e4 | 61 | |
45b35a5c | 62 | struct mm_struct; |
1da177e4 LT |
63 | |
64 | #ifdef CONFIG_NUMA | |
65 | ||
66 | /* | |
67 | * Describe a memory policy. | |
68 | * | |
69 | * A mempolicy can be either associated with a process or with a VMA. | |
70 | * For VMA related allocations the VMA policy is preferred, otherwise | |
71 | * the process policy is used. Interrupts ignore the memory policy | |
72 | * of the current process. | |
73 | * | |
74 | * Locking policy for interlave: | |
75 | * In process context there is no locking because only the process accesses | |
76 | * its own state. All vma manipulation is somewhat protected by a down_read on | |
b8072f09 | 77 | * mmap_sem. |
1da177e4 LT |
78 | * |
79 | * Freeing policy: | |
19770b32 | 80 | * Mempolicy objects are reference counted. A mempolicy will be freed when |
f0be3d32 | 81 | * mpol_put() decrements the reference count to zero. |
1da177e4 | 82 | * |
846a16bf LS |
83 | * Duplicating policy objects: |
84 | * mpol_dup() allocates a new mempolicy and copies the specified mempolicy | |
19770b32 | 85 | * to the new storage. The reference count of the new object is initialized |
846a16bf | 86 | * to 1, representing the caller of mpol_dup(). |
1da177e4 LT |
87 | */ |
88 | struct mempolicy { | |
89 | atomic_t refcnt; | |
45c4745a | 90 | unsigned short mode; /* See MPOL_* above */ |
028fec41 | 91 | unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ |
1da177e4 | 92 | union { |
1da177e4 | 93 | short preferred_node; /* preferred */ |
19770b32 | 94 | nodemask_t nodes; /* interleave/bind */ |
1da177e4 LT |
95 | /* undefined for default */ |
96 | } v; | |
f5b087b5 DR |
97 | union { |
98 | nodemask_t cpuset_mems_allowed; /* relative to these nodes */ | |
99 | nodemask_t user_nodemask; /* nodemask passed by user */ | |
100 | } w; | |
1da177e4 LT |
101 | }; |
102 | ||
103 | /* | |
104 | * Support for managing mempolicy data objects (clone, copy, destroy) | |
105 | * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. | |
106 | */ | |
107 | ||
f0be3d32 LS |
108 | extern void __mpol_put(struct mempolicy *pol); |
109 | static inline void mpol_put(struct mempolicy *pol) | |
1da177e4 LT |
110 | { |
111 | if (pol) | |
f0be3d32 | 112 | __mpol_put(pol); |
1da177e4 LT |
113 | } |
114 | ||
52cd3b07 LS |
115 | /* |
116 | * Does mempolicy pol need explicit unref after use? | |
117 | * Currently only needed for shared policies. | |
118 | */ | |
119 | static inline int mpol_needs_cond_ref(struct mempolicy *pol) | |
120 | { | |
121 | return (pol && (pol->flags & MPOL_F_SHARED)); | |
122 | } | |
123 | ||
124 | static inline void mpol_cond_put(struct mempolicy *pol) | |
125 | { | |
126 | if (mpol_needs_cond_ref(pol)) | |
127 | __mpol_put(pol); | |
128 | } | |
129 | ||
130 | extern struct mempolicy *__mpol_cond_copy(struct mempolicy *tompol, | |
131 | struct mempolicy *frompol); | |
132 | static inline struct mempolicy *mpol_cond_copy(struct mempolicy *tompol, | |
133 | struct mempolicy *frompol) | |
134 | { | |
135 | if (!frompol) | |
136 | return frompol; | |
137 | return __mpol_cond_copy(tompol, frompol); | |
138 | } | |
139 | ||
846a16bf LS |
140 | extern struct mempolicy *__mpol_dup(struct mempolicy *pol); |
141 | static inline struct mempolicy *mpol_dup(struct mempolicy *pol) | |
1da177e4 LT |
142 | { |
143 | if (pol) | |
846a16bf | 144 | pol = __mpol_dup(pol); |
1da177e4 LT |
145 | return pol; |
146 | } | |
147 | ||
148 | #define vma_policy(vma) ((vma)->vm_policy) | |
149 | #define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol)) | |
150 | ||
151 | static inline void mpol_get(struct mempolicy *pol) | |
152 | { | |
153 | if (pol) | |
154 | atomic_inc(&pol->refcnt); | |
155 | } | |
156 | ||
157 | extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b); | |
158 | static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
159 | { | |
160 | if (a == b) | |
161 | return 1; | |
162 | return __mpol_equal(a, b); | |
163 | } | |
1da177e4 | 164 | |
1da177e4 LT |
165 | /* |
166 | * Tree of shared policies for a shared memory region. | |
167 | * Maintain the policies in a pseudo mm that contains vmas. The vmas | |
168 | * carry the policy. As a special twist the pseudo mm is indexed in pages, not | |
169 | * bytes, so that we can work with shared memory segments bigger than | |
170 | * unsigned long. | |
171 | */ | |
172 | ||
173 | struct sp_node { | |
174 | struct rb_node nd; | |
175 | unsigned long start, end; | |
176 | struct mempolicy *policy; | |
177 | }; | |
178 | ||
179 | struct shared_policy { | |
180 | struct rb_root root; | |
181 | spinlock_t lock; | |
182 | }; | |
183 | ||
45c4745a | 184 | void mpol_shared_policy_init(struct shared_policy *info, unsigned short mode, |
028fec41 | 185 | unsigned short flags, nodemask_t *nodes); |
1da177e4 LT |
186 | int mpol_set_shared_policy(struct shared_policy *info, |
187 | struct vm_area_struct *vma, | |
188 | struct mempolicy *new); | |
189 | void mpol_free_shared_policy(struct shared_policy *p); | |
190 | struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, | |
191 | unsigned long idx); | |
192 | ||
193 | extern void numa_default_policy(void); | |
194 | extern void numa_policy_init(void); | |
74cb2155 PJ |
195 | extern void mpol_rebind_task(struct task_struct *tsk, |
196 | const nodemask_t *new); | |
4225399a | 197 | extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); |
c61afb18 | 198 | extern void mpol_fix_fork_child_flag(struct task_struct *p); |
4225399a | 199 | |
5da7ca86 | 200 | extern struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
19770b32 MG |
201 | unsigned long addr, gfp_t gfp_flags, |
202 | struct mempolicy **mpol, nodemask_t **nodemask); | |
dc85da15 | 203 | extern unsigned slab_node(struct mempolicy *policy); |
1da177e4 | 204 | |
2f6726e5 | 205 | extern enum zone_type policy_zone; |
4be38e35 | 206 | |
2f6726e5 | 207 | static inline void check_highest_zone(enum zone_type k) |
4be38e35 | 208 | { |
b377fd39 | 209 | if (k > policy_zone && k != ZONE_MOVABLE) |
4be38e35 CL |
210 | policy_zone = k; |
211 | } | |
212 | ||
39743889 CL |
213 | int do_migrate_pages(struct mm_struct *mm, |
214 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags); | |
215 | ||
1da177e4 LT |
216 | #else |
217 | ||
218 | struct mempolicy {}; | |
219 | ||
220 | static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
221 | { | |
222 | return 1; | |
223 | } | |
1da177e4 | 224 | |
f0be3d32 | 225 | static inline void mpol_put(struct mempolicy *p) |
1da177e4 LT |
226 | { |
227 | } | |
228 | ||
52cd3b07 LS |
229 | static inline void mpol_cond_put(struct mempolicy *pol) |
230 | { | |
231 | } | |
232 | ||
233 | static inline struct mempolicy *mpol_cond_copy(struct mempolicy *to, | |
234 | struct mempolicy *from) | |
235 | { | |
236 | return from; | |
237 | } | |
238 | ||
1da177e4 LT |
239 | static inline void mpol_get(struct mempolicy *pol) |
240 | { | |
241 | } | |
242 | ||
846a16bf | 243 | static inline struct mempolicy *mpol_dup(struct mempolicy *old) |
1da177e4 LT |
244 | { |
245 | return NULL; | |
246 | } | |
247 | ||
1da177e4 LT |
248 | struct shared_policy {}; |
249 | ||
250 | static inline int mpol_set_shared_policy(struct shared_policy *info, | |
251 | struct vm_area_struct *vma, | |
252 | struct mempolicy *new) | |
253 | { | |
254 | return -EINVAL; | |
255 | } | |
256 | ||
7339ff83 | 257 | static inline void mpol_shared_policy_init(struct shared_policy *info, |
45c4745a | 258 | unsigned short mode, unsigned short flags, nodemask_t *nodes) |
1da177e4 LT |
259 | { |
260 | } | |
261 | ||
262 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
263 | { | |
264 | } | |
265 | ||
266 | static inline struct mempolicy * | |
267 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
268 | { | |
269 | return NULL; | |
270 | } | |
271 | ||
272 | #define vma_policy(vma) NULL | |
273 | #define vma_set_policy(vma, pol) do {} while(0) | |
274 | ||
275 | static inline void numa_policy_init(void) | |
276 | { | |
277 | } | |
278 | ||
279 | static inline void numa_default_policy(void) | |
280 | { | |
281 | } | |
282 | ||
74cb2155 | 283 | static inline void mpol_rebind_task(struct task_struct *tsk, |
68860ec1 PJ |
284 | const nodemask_t *new) |
285 | { | |
286 | } | |
287 | ||
4225399a PJ |
288 | static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
289 | { | |
290 | } | |
291 | ||
c61afb18 PJ |
292 | static inline void mpol_fix_fork_child_flag(struct task_struct *p) |
293 | { | |
294 | } | |
295 | ||
5da7ca86 | 296 | static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
19770b32 MG |
297 | unsigned long addr, gfp_t gfp_flags, |
298 | struct mempolicy **mpol, nodemask_t **nodemask) | |
5da7ca86 | 299 | { |
19770b32 MG |
300 | *mpol = NULL; |
301 | *nodemask = NULL; | |
0e88460d | 302 | return node_zonelist(0, gfp_flags); |
5da7ca86 CL |
303 | } |
304 | ||
45b07ef3 PJ |
305 | static inline int do_migrate_pages(struct mm_struct *mm, |
306 | const nodemask_t *from_nodes, | |
307 | const nodemask_t *to_nodes, int flags) | |
308 | { | |
309 | return 0; | |
310 | } | |
311 | ||
4be38e35 CL |
312 | static inline void check_highest_zone(int k) |
313 | { | |
314 | } | |
1da177e4 LT |
315 | #endif /* CONFIG_NUMA */ |
316 | #endif /* __KERNEL__ */ | |
317 | ||
318 | #endif |