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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 | |
1da177e4 | 9 | |
1da177e4 | 10 | #include <linux/mmzone.h> |
c1ef8e2c | 11 | #include <linux/dax.h> |
1da177e4 LT |
12 | #include <linux/slab.h> |
13 | #include <linux/rbtree.h> | |
14 | #include <linux/spinlock.h> | |
dfcd3c0d | 15 | #include <linux/nodemask.h> |
83d1674a | 16 | #include <linux/pagemap.h> |
607ca46e | 17 | #include <uapi/linux/mempolicy.h> |
1da177e4 | 18 | |
45b35a5c | 19 | struct mm_struct; |
1da177e4 LT |
20 | |
21 | #ifdef CONFIG_NUMA | |
22 | ||
23 | /* | |
24 | * Describe a memory policy. | |
25 | * | |
26 | * A mempolicy can be either associated with a process or with a VMA. | |
27 | * For VMA related allocations the VMA policy is preferred, otherwise | |
28 | * the process policy is used. Interrupts ignore the memory policy | |
29 | * of the current process. | |
30 | * | |
31 | * Locking policy for interlave: | |
32 | * In process context there is no locking because only the process accesses | |
33 | * its own state. All vma manipulation is somewhat protected by a down_read on | |
c1e8d7c6 | 34 | * mmap_lock. |
1da177e4 LT |
35 | * |
36 | * Freeing policy: | |
19770b32 | 37 | * Mempolicy objects are reference counted. A mempolicy will be freed when |
f0be3d32 | 38 | * mpol_put() decrements the reference count to zero. |
1da177e4 | 39 | * |
846a16bf LS |
40 | * Duplicating policy objects: |
41 | * mpol_dup() allocates a new mempolicy and copies the specified mempolicy | |
19770b32 | 42 | * to the new storage. The reference count of the new object is initialized |
846a16bf | 43 | * to 1, representing the caller of mpol_dup(). |
1da177e4 LT |
44 | */ |
45 | struct mempolicy { | |
46 | atomic_t refcnt; | |
45c4745a | 47 | unsigned short mode; /* See MPOL_* above */ |
028fec41 | 48 | unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ |
1da177e4 | 49 | union { |
1da177e4 | 50 | short preferred_node; /* preferred */ |
19770b32 | 51 | nodemask_t nodes; /* interleave/bind */ |
1da177e4 LT |
52 | /* undefined for default */ |
53 | } v; | |
f5b087b5 DR |
54 | union { |
55 | nodemask_t cpuset_mems_allowed; /* relative to these nodes */ | |
56 | nodemask_t user_nodemask; /* nodemask passed by user */ | |
57 | } w; | |
1da177e4 LT |
58 | }; |
59 | ||
60 | /* | |
61 | * Support for managing mempolicy data objects (clone, copy, destroy) | |
62 | * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. | |
63 | */ | |
64 | ||
f0be3d32 LS |
65 | extern void __mpol_put(struct mempolicy *pol); |
66 | static inline void mpol_put(struct mempolicy *pol) | |
1da177e4 LT |
67 | { |
68 | if (pol) | |
f0be3d32 | 69 | __mpol_put(pol); |
1da177e4 LT |
70 | } |
71 | ||
52cd3b07 LS |
72 | /* |
73 | * Does mempolicy pol need explicit unref after use? | |
74 | * Currently only needed for shared policies. | |
75 | */ | |
76 | static inline int mpol_needs_cond_ref(struct mempolicy *pol) | |
77 | { | |
78 | return (pol && (pol->flags & MPOL_F_SHARED)); | |
79 | } | |
80 | ||
81 | static inline void mpol_cond_put(struct mempolicy *pol) | |
82 | { | |
83 | if (mpol_needs_cond_ref(pol)) | |
84 | __mpol_put(pol); | |
85 | } | |
86 | ||
846a16bf LS |
87 | extern struct mempolicy *__mpol_dup(struct mempolicy *pol); |
88 | static inline struct mempolicy *mpol_dup(struct mempolicy *pol) | |
1da177e4 LT |
89 | { |
90 | if (pol) | |
846a16bf | 91 | pol = __mpol_dup(pol); |
1da177e4 LT |
92 | return pol; |
93 | } | |
94 | ||
95 | #define vma_policy(vma) ((vma)->vm_policy) | |
1da177e4 LT |
96 | |
97 | static inline void mpol_get(struct mempolicy *pol) | |
98 | { | |
99 | if (pol) | |
100 | atomic_inc(&pol->refcnt); | |
101 | } | |
102 | ||
fcfb4dcc KM |
103 | extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b); |
104 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
1da177e4 LT |
105 | { |
106 | if (a == b) | |
fcfb4dcc | 107 | return true; |
1da177e4 LT |
108 | return __mpol_equal(a, b); |
109 | } | |
1da177e4 | 110 | |
1da177e4 LT |
111 | /* |
112 | * Tree of shared policies for a shared memory region. | |
113 | * Maintain the policies in a pseudo mm that contains vmas. The vmas | |
114 | * carry the policy. As a special twist the pseudo mm is indexed in pages, not | |
115 | * bytes, so that we can work with shared memory segments bigger than | |
116 | * unsigned long. | |
117 | */ | |
118 | ||
119 | struct sp_node { | |
120 | struct rb_node nd; | |
121 | unsigned long start, end; | |
122 | struct mempolicy *policy; | |
123 | }; | |
124 | ||
125 | struct shared_policy { | |
126 | struct rb_root root; | |
4a8c7bb5 | 127 | rwlock_t lock; |
1da177e4 LT |
128 | }; |
129 | ||
ef0855d3 | 130 | int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst); |
71fe804b | 131 | void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol); |
1da177e4 LT |
132 | int mpol_set_shared_policy(struct shared_policy *info, |
133 | struct vm_area_struct *vma, | |
134 | struct mempolicy *new); | |
135 | void mpol_free_shared_policy(struct shared_policy *p); | |
136 | struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, | |
137 | unsigned long idx); | |
138 | ||
74d2c3a0 ON |
139 | struct mempolicy *get_task_policy(struct task_struct *p); |
140 | struct mempolicy *__get_vma_policy(struct vm_area_struct *vma, | |
141 | unsigned long addr); | |
6b6482bb | 142 | bool vma_policy_mof(struct vm_area_struct *vma); |
d98f6cb6 | 143 | |
1da177e4 LT |
144 | extern void numa_default_policy(void); |
145 | extern void numa_policy_init(void); | |
213980c0 | 146 | extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new); |
4225399a | 147 | extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); |
4225399a | 148 | |
04ec6264 | 149 | extern int huge_node(struct vm_area_struct *vma, |
19770b32 MG |
150 | unsigned long addr, gfp_t gfp_flags, |
151 | struct mempolicy **mpol, nodemask_t **nodemask); | |
06808b08 | 152 | extern bool init_nodemask_of_mempolicy(nodemask_t *mask); |
6f48d0eb DR |
153 | extern bool mempolicy_nodemask_intersects(struct task_struct *tsk, |
154 | const nodemask_t *mask); | |
2a389610 | 155 | extern unsigned int mempolicy_slab_node(void); |
1da177e4 | 156 | |
2f6726e5 | 157 | extern enum zone_type policy_zone; |
4be38e35 | 158 | |
2f6726e5 | 159 | static inline void check_highest_zone(enum zone_type k) |
4be38e35 | 160 | { |
b377fd39 | 161 | if (k > policy_zone && k != ZONE_MOVABLE) |
4be38e35 CL |
162 | policy_zone = k; |
163 | } | |
164 | ||
0ce72d4f AM |
165 | int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
166 | const nodemask_t *to, int flags); | |
39743889 | 167 | |
095f1fc4 LS |
168 | |
169 | #ifdef CONFIG_TMPFS | |
a7a88b23 | 170 | extern int mpol_parse_str(char *str, struct mempolicy **mpol); |
13057efb | 171 | #endif |
095f1fc4 | 172 | |
948927ee | 173 | extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol); |
83d1674a GS |
174 | |
175 | /* Check if a vma is migratable */ | |
20ca87f2 | 176 | extern bool vma_migratable(struct vm_area_struct *vma); |
83d1674a | 177 | |
771fb4d8 | 178 | extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long); |
c11600e4 | 179 | extern void mpol_put_task_policy(struct task_struct *); |
771fb4d8 | 180 | |
1da177e4 LT |
181 | #else |
182 | ||
183 | struct mempolicy {}; | |
184 | ||
fcfb4dcc | 185 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) |
1da177e4 | 186 | { |
fcfb4dcc | 187 | return true; |
1da177e4 | 188 | } |
1da177e4 | 189 | |
f0be3d32 | 190 | static inline void mpol_put(struct mempolicy *p) |
1da177e4 LT |
191 | { |
192 | } | |
193 | ||
52cd3b07 LS |
194 | static inline void mpol_cond_put(struct mempolicy *pol) |
195 | { | |
196 | } | |
197 | ||
1da177e4 LT |
198 | static inline void mpol_get(struct mempolicy *pol) |
199 | { | |
200 | } | |
201 | ||
1da177e4 LT |
202 | struct shared_policy {}; |
203 | ||
71fe804b LS |
204 | static inline void mpol_shared_policy_init(struct shared_policy *sp, |
205 | struct mempolicy *mpol) | |
1da177e4 LT |
206 | { |
207 | } | |
208 | ||
209 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
210 | { | |
211 | } | |
212 | ||
75edd345 HD |
213 | static inline struct mempolicy * |
214 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
215 | { | |
216 | return NULL; | |
217 | } | |
218 | ||
1da177e4 | 219 | #define vma_policy(vma) NULL |
ef0855d3 ON |
220 | |
221 | static inline int | |
222 | vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst) | |
223 | { | |
224 | return 0; | |
225 | } | |
1da177e4 LT |
226 | |
227 | static inline void numa_policy_init(void) | |
228 | { | |
229 | } | |
230 | ||
231 | static inline void numa_default_policy(void) | |
232 | { | |
233 | } | |
234 | ||
74cb2155 | 235 | static inline void mpol_rebind_task(struct task_struct *tsk, |
213980c0 | 236 | const nodemask_t *new) |
68860ec1 PJ |
237 | { |
238 | } | |
239 | ||
4225399a PJ |
240 | static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
241 | { | |
242 | } | |
243 | ||
04ec6264 | 244 | static inline int huge_node(struct vm_area_struct *vma, |
19770b32 MG |
245 | unsigned long addr, gfp_t gfp_flags, |
246 | struct mempolicy **mpol, nodemask_t **nodemask) | |
5da7ca86 | 247 | { |
19770b32 MG |
248 | *mpol = NULL; |
249 | *nodemask = NULL; | |
04ec6264 | 250 | return 0; |
5da7ca86 CL |
251 | } |
252 | ||
6f48d0eb DR |
253 | static inline bool init_nodemask_of_mempolicy(nodemask_t *m) |
254 | { | |
255 | return false; | |
256 | } | |
257 | ||
0ce72d4f AM |
258 | static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
259 | const nodemask_t *to, int flags) | |
45b07ef3 PJ |
260 | { |
261 | return 0; | |
262 | } | |
263 | ||
4be38e35 CL |
264 | static inline void check_highest_zone(int k) |
265 | { | |
266 | } | |
095f1fc4 LS |
267 | |
268 | #ifdef CONFIG_TMPFS | |
a7a88b23 | 269 | static inline int mpol_parse_str(char *str, struct mempolicy **mpol) |
095f1fc4 | 270 | { |
71fe804b | 271 | return 1; /* error */ |
095f1fc4 | 272 | } |
13057efb | 273 | #endif |
095f1fc4 | 274 | |
771fb4d8 LS |
275 | static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma, |
276 | unsigned long address) | |
277 | { | |
278 | return -1; /* no node preference */ | |
279 | } | |
280 | ||
c11600e4 DR |
281 | static inline void mpol_put_task_policy(struct task_struct *task) |
282 | { | |
283 | } | |
1da177e4 | 284 | #endif /* CONFIG_NUMA */ |
1da177e4 | 285 | #endif |