Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | /* |
3 | * NUMA memory policies for Linux. | |
4 | * Copyright 2003,2004 Andi Kleen SuSE Labs | |
5 | */ | |
607ca46e DH |
6 | #ifndef _LINUX_MEMPOLICY_H |
7 | #define _LINUX_MEMPOLICY_H 1 | |
1da177e4 | 8 | |
8ca39e68 | 9 | #include <linux/sched.h> |
1da177e4 | 10 | #include <linux/mmzone.h> |
1da177e4 LT |
11 | #include <linux/slab.h> |
12 | #include <linux/rbtree.h> | |
13 | #include <linux/spinlock.h> | |
dfcd3c0d | 14 | #include <linux/nodemask.h> |
83d1674a | 15 | #include <linux/pagemap.h> |
607ca46e | 16 | #include <uapi/linux/mempolicy.h> |
1da177e4 | 17 | |
45b35a5c | 18 | struct mm_struct; |
1da177e4 LT |
19 | |
20 | #ifdef CONFIG_NUMA | |
21 | ||
22 | /* | |
23 | * Describe a memory policy. | |
24 | * | |
25 | * A mempolicy can be either associated with a process or with a VMA. | |
26 | * For VMA related allocations the VMA policy is preferred, otherwise | |
27 | * the process policy is used. Interrupts ignore the memory policy | |
28 | * of the current process. | |
29 | * | |
f3f3416c | 30 | * Locking policy for interleave: |
1da177e4 LT |
31 | * In process context there is no locking because only the process accesses |
32 | * its own state. All vma manipulation is somewhat protected by a down_read on | |
c1e8d7c6 | 33 | * mmap_lock. |
1da177e4 LT |
34 | * |
35 | * Freeing policy: | |
19770b32 | 36 | * Mempolicy objects are reference counted. A mempolicy will be freed when |
f0be3d32 | 37 | * mpol_put() decrements the reference count to zero. |
1da177e4 | 38 | * |
846a16bf LS |
39 | * Duplicating policy objects: |
40 | * mpol_dup() allocates a new mempolicy and copies the specified mempolicy | |
19770b32 | 41 | * to the new storage. The reference count of the new object is initialized |
846a16bf | 42 | * to 1, representing the caller of mpol_dup(). |
1da177e4 LT |
43 | */ |
44 | struct mempolicy { | |
45 | atomic_t refcnt; | |
45c4745a | 46 | unsigned short mode; /* See MPOL_* above */ |
028fec41 | 47 | unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ |
269fbe72 | 48 | nodemask_t nodes; /* interleave/bind/perfer */ |
c6018b4b | 49 | int home_node; /* Home node to use for MPOL_BIND and MPOL_PREFERRED_MANY */ |
269fbe72 | 50 | |
f5b087b5 DR |
51 | union { |
52 | nodemask_t cpuset_mems_allowed; /* relative to these nodes */ | |
53 | nodemask_t user_nodemask; /* nodemask passed by user */ | |
54 | } w; | |
1da177e4 LT |
55 | }; |
56 | ||
57 | /* | |
58 | * Support for managing mempolicy data objects (clone, copy, destroy) | |
59 | * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. | |
60 | */ | |
61 | ||
f0be3d32 LS |
62 | extern void __mpol_put(struct mempolicy *pol); |
63 | static inline void mpol_put(struct mempolicy *pol) | |
1da177e4 LT |
64 | { |
65 | if (pol) | |
f0be3d32 | 66 | __mpol_put(pol); |
1da177e4 LT |
67 | } |
68 | ||
52cd3b07 LS |
69 | /* |
70 | * Does mempolicy pol need explicit unref after use? | |
71 | * Currently only needed for shared policies. | |
72 | */ | |
73 | static inline int mpol_needs_cond_ref(struct mempolicy *pol) | |
74 | { | |
75 | return (pol && (pol->flags & MPOL_F_SHARED)); | |
76 | } | |
77 | ||
78 | static inline void mpol_cond_put(struct mempolicy *pol) | |
79 | { | |
80 | if (mpol_needs_cond_ref(pol)) | |
81 | __mpol_put(pol); | |
82 | } | |
83 | ||
846a16bf LS |
84 | extern struct mempolicy *__mpol_dup(struct mempolicy *pol); |
85 | static inline struct mempolicy *mpol_dup(struct mempolicy *pol) | |
1da177e4 LT |
86 | { |
87 | if (pol) | |
846a16bf | 88 | pol = __mpol_dup(pol); |
1da177e4 LT |
89 | return pol; |
90 | } | |
91 | ||
92 | #define vma_policy(vma) ((vma)->vm_policy) | |
1da177e4 LT |
93 | |
94 | static inline void mpol_get(struct mempolicy *pol) | |
95 | { | |
96 | if (pol) | |
97 | atomic_inc(&pol->refcnt); | |
98 | } | |
99 | ||
fcfb4dcc KM |
100 | extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b); |
101 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
1da177e4 LT |
102 | { |
103 | if (a == b) | |
fcfb4dcc | 104 | return true; |
1da177e4 LT |
105 | return __mpol_equal(a, b); |
106 | } | |
1da177e4 | 107 | |
1da177e4 LT |
108 | /* |
109 | * Tree of shared policies for a shared memory region. | |
110 | * Maintain the policies in a pseudo mm that contains vmas. The vmas | |
111 | * carry the policy. As a special twist the pseudo mm is indexed in pages, not | |
112 | * bytes, so that we can work with shared memory segments bigger than | |
113 | * unsigned long. | |
114 | */ | |
115 | ||
116 | struct sp_node { | |
117 | struct rb_node nd; | |
118 | unsigned long start, end; | |
119 | struct mempolicy *policy; | |
120 | }; | |
121 | ||
122 | struct shared_policy { | |
123 | struct rb_root root; | |
4a8c7bb5 | 124 | rwlock_t lock; |
1da177e4 LT |
125 | }; |
126 | ||
ef0855d3 | 127 | int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst); |
71fe804b | 128 | void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol); |
1da177e4 LT |
129 | int mpol_set_shared_policy(struct shared_policy *info, |
130 | struct vm_area_struct *vma, | |
131 | struct mempolicy *new); | |
132 | void mpol_free_shared_policy(struct shared_policy *p); | |
133 | struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, | |
134 | unsigned long idx); | |
135 | ||
74d2c3a0 ON |
136 | struct mempolicy *get_task_policy(struct task_struct *p); |
137 | struct mempolicy *__get_vma_policy(struct vm_area_struct *vma, | |
138 | unsigned long addr); | |
6b6482bb | 139 | bool vma_policy_mof(struct vm_area_struct *vma); |
d98f6cb6 | 140 | |
1da177e4 LT |
141 | extern void numa_default_policy(void); |
142 | extern void numa_policy_init(void); | |
213980c0 | 143 | extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new); |
4225399a | 144 | extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); |
4225399a | 145 | |
04ec6264 | 146 | extern int huge_node(struct vm_area_struct *vma, |
19770b32 MG |
147 | unsigned long addr, gfp_t gfp_flags, |
148 | struct mempolicy **mpol, nodemask_t **nodemask); | |
06808b08 | 149 | extern bool init_nodemask_of_mempolicy(nodemask_t *mask); |
b26e517a | 150 | extern bool mempolicy_in_oom_domain(struct task_struct *tsk, |
6f48d0eb | 151 | const nodemask_t *mask); |
8ca39e68 MS |
152 | extern nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy); |
153 | ||
2a389610 | 154 | extern unsigned int mempolicy_slab_node(void); |
1da177e4 | 155 | |
2f6726e5 | 156 | extern enum zone_type policy_zone; |
4be38e35 | 157 | |
2f6726e5 | 158 | static inline void check_highest_zone(enum zone_type k) |
4be38e35 | 159 | { |
b377fd39 | 160 | if (k > policy_zone && k != ZONE_MOVABLE) |
4be38e35 CL |
161 | policy_zone = k; |
162 | } | |
163 | ||
0ce72d4f AM |
164 | int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
165 | const nodemask_t *to, int flags); | |
39743889 | 166 | |
095f1fc4 LS |
167 | |
168 | #ifdef CONFIG_TMPFS | |
a7a88b23 | 169 | extern int mpol_parse_str(char *str, struct mempolicy **mpol); |
13057efb | 170 | #endif |
095f1fc4 | 171 | |
948927ee | 172 | extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol); |
83d1674a GS |
173 | |
174 | /* Check if a vma is migratable */ | |
20ca87f2 | 175 | extern bool vma_migratable(struct vm_area_struct *vma); |
83d1674a | 176 | |
771fb4d8 | 177 | extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long); |
c11600e4 | 178 | extern void mpol_put_task_policy(struct task_struct *); |
771fb4d8 | 179 | |
cfcaa66f BW |
180 | static inline bool mpol_is_preferred_many(struct mempolicy *pol) |
181 | { | |
182 | return (pol->mode == MPOL_PREFERRED_MANY); | |
183 | } | |
184 | ||
d2226ebd | 185 | extern bool apply_policy_zone(struct mempolicy *policy, enum zone_type zone); |
cfcaa66f | 186 | |
1da177e4 LT |
187 | #else |
188 | ||
189 | struct mempolicy {}; | |
190 | ||
fcfb4dcc | 191 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) |
1da177e4 | 192 | { |
fcfb4dcc | 193 | return true; |
1da177e4 | 194 | } |
1da177e4 | 195 | |
f0be3d32 | 196 | static inline void mpol_put(struct mempolicy *p) |
1da177e4 LT |
197 | { |
198 | } | |
199 | ||
52cd3b07 LS |
200 | static inline void mpol_cond_put(struct mempolicy *pol) |
201 | { | |
202 | } | |
203 | ||
1da177e4 LT |
204 | static inline void mpol_get(struct mempolicy *pol) |
205 | { | |
206 | } | |
207 | ||
1da177e4 LT |
208 | struct shared_policy {}; |
209 | ||
71fe804b LS |
210 | static inline void mpol_shared_policy_init(struct shared_policy *sp, |
211 | struct mempolicy *mpol) | |
1da177e4 LT |
212 | { |
213 | } | |
214 | ||
215 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
216 | { | |
217 | } | |
218 | ||
75edd345 HD |
219 | static inline struct mempolicy * |
220 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
221 | { | |
222 | return NULL; | |
223 | } | |
224 | ||
1da177e4 | 225 | #define vma_policy(vma) NULL |
ef0855d3 ON |
226 | |
227 | static inline int | |
228 | vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst) | |
229 | { | |
230 | return 0; | |
231 | } | |
1da177e4 LT |
232 | |
233 | static inline void numa_policy_init(void) | |
234 | { | |
235 | } | |
236 | ||
237 | static inline void numa_default_policy(void) | |
238 | { | |
239 | } | |
240 | ||
74cb2155 | 241 | static inline void mpol_rebind_task(struct task_struct *tsk, |
213980c0 | 242 | const nodemask_t *new) |
68860ec1 PJ |
243 | { |
244 | } | |
245 | ||
4225399a PJ |
246 | static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
247 | { | |
248 | } | |
249 | ||
04ec6264 | 250 | static inline int huge_node(struct vm_area_struct *vma, |
19770b32 MG |
251 | unsigned long addr, gfp_t gfp_flags, |
252 | struct mempolicy **mpol, nodemask_t **nodemask) | |
5da7ca86 | 253 | { |
19770b32 MG |
254 | *mpol = NULL; |
255 | *nodemask = NULL; | |
04ec6264 | 256 | return 0; |
5da7ca86 CL |
257 | } |
258 | ||
6f48d0eb DR |
259 | static inline bool init_nodemask_of_mempolicy(nodemask_t *m) |
260 | { | |
261 | return false; | |
262 | } | |
263 | ||
0ce72d4f AM |
264 | static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
265 | const nodemask_t *to, int flags) | |
45b07ef3 PJ |
266 | { |
267 | return 0; | |
268 | } | |
269 | ||
4be38e35 CL |
270 | static inline void check_highest_zone(int k) |
271 | { | |
272 | } | |
095f1fc4 LS |
273 | |
274 | #ifdef CONFIG_TMPFS | |
a7a88b23 | 275 | static inline int mpol_parse_str(char *str, struct mempolicy **mpol) |
095f1fc4 | 276 | { |
71fe804b | 277 | return 1; /* error */ |
095f1fc4 | 278 | } |
13057efb | 279 | #endif |
095f1fc4 | 280 | |
771fb4d8 LS |
281 | static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma, |
282 | unsigned long address) | |
283 | { | |
284 | return -1; /* no node preference */ | |
285 | } | |
286 | ||
c11600e4 DR |
287 | static inline void mpol_put_task_policy(struct task_struct *task) |
288 | { | |
289 | } | |
8ca39e68 | 290 | |
cfcaa66f BW |
291 | static inline bool mpol_is_preferred_many(struct mempolicy *pol) |
292 | { | |
293 | return false; | |
294 | } | |
295 | ||
1da177e4 | 296 | #endif /* CONFIG_NUMA */ |
1da177e4 | 297 | #endif |