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 | ||
154 | static inline nodemask_t *policy_nodemask_current(gfp_t gfp) | |
155 | { | |
156 | struct mempolicy *mpol = get_task_policy(current); | |
157 | ||
158 | return policy_nodemask(gfp, mpol); | |
159 | } | |
160 | ||
2a389610 | 161 | extern unsigned int mempolicy_slab_node(void); |
1da177e4 | 162 | |
2f6726e5 | 163 | extern enum zone_type policy_zone; |
4be38e35 | 164 | |
2f6726e5 | 165 | static inline void check_highest_zone(enum zone_type k) |
4be38e35 | 166 | { |
b377fd39 | 167 | if (k > policy_zone && k != ZONE_MOVABLE) |
4be38e35 CL |
168 | policy_zone = k; |
169 | } | |
170 | ||
0ce72d4f AM |
171 | int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
172 | const nodemask_t *to, int flags); | |
39743889 | 173 | |
095f1fc4 LS |
174 | |
175 | #ifdef CONFIG_TMPFS | |
a7a88b23 | 176 | extern int mpol_parse_str(char *str, struct mempolicy **mpol); |
13057efb | 177 | #endif |
095f1fc4 | 178 | |
948927ee | 179 | extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol); |
83d1674a GS |
180 | |
181 | /* Check if a vma is migratable */ | |
20ca87f2 | 182 | extern bool vma_migratable(struct vm_area_struct *vma); |
83d1674a | 183 | |
771fb4d8 | 184 | extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long); |
c11600e4 | 185 | extern void mpol_put_task_policy(struct task_struct *); |
771fb4d8 | 186 | |
cfcaa66f BW |
187 | static inline bool mpol_is_preferred_many(struct mempolicy *pol) |
188 | { | |
189 | return (pol->mode == MPOL_PREFERRED_MANY); | |
190 | } | |
191 | ||
192 | ||
1da177e4 LT |
193 | #else |
194 | ||
195 | struct mempolicy {}; | |
196 | ||
fcfb4dcc | 197 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) |
1da177e4 | 198 | { |
fcfb4dcc | 199 | return true; |
1da177e4 | 200 | } |
1da177e4 | 201 | |
f0be3d32 | 202 | static inline void mpol_put(struct mempolicy *p) |
1da177e4 LT |
203 | { |
204 | } | |
205 | ||
52cd3b07 LS |
206 | static inline void mpol_cond_put(struct mempolicy *pol) |
207 | { | |
208 | } | |
209 | ||
1da177e4 LT |
210 | static inline void mpol_get(struct mempolicy *pol) |
211 | { | |
212 | } | |
213 | ||
1da177e4 LT |
214 | struct shared_policy {}; |
215 | ||
71fe804b LS |
216 | static inline void mpol_shared_policy_init(struct shared_policy *sp, |
217 | struct mempolicy *mpol) | |
1da177e4 LT |
218 | { |
219 | } | |
220 | ||
221 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
222 | { | |
223 | } | |
224 | ||
75edd345 HD |
225 | static inline struct mempolicy * |
226 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
227 | { | |
228 | return NULL; | |
229 | } | |
230 | ||
1da177e4 | 231 | #define vma_policy(vma) NULL |
ef0855d3 ON |
232 | |
233 | static inline int | |
234 | vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst) | |
235 | { | |
236 | return 0; | |
237 | } | |
1da177e4 LT |
238 | |
239 | static inline void numa_policy_init(void) | |
240 | { | |
241 | } | |
242 | ||
243 | static inline void numa_default_policy(void) | |
244 | { | |
245 | } | |
246 | ||
74cb2155 | 247 | static inline void mpol_rebind_task(struct task_struct *tsk, |
213980c0 | 248 | const nodemask_t *new) |
68860ec1 PJ |
249 | { |
250 | } | |
251 | ||
4225399a PJ |
252 | static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
253 | { | |
254 | } | |
255 | ||
04ec6264 | 256 | static inline int huge_node(struct vm_area_struct *vma, |
19770b32 MG |
257 | unsigned long addr, gfp_t gfp_flags, |
258 | struct mempolicy **mpol, nodemask_t **nodemask) | |
5da7ca86 | 259 | { |
19770b32 MG |
260 | *mpol = NULL; |
261 | *nodemask = NULL; | |
04ec6264 | 262 | return 0; |
5da7ca86 CL |
263 | } |
264 | ||
6f48d0eb DR |
265 | static inline bool init_nodemask_of_mempolicy(nodemask_t *m) |
266 | { | |
267 | return false; | |
268 | } | |
269 | ||
0ce72d4f AM |
270 | static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, |
271 | const nodemask_t *to, int flags) | |
45b07ef3 PJ |
272 | { |
273 | return 0; | |
274 | } | |
275 | ||
4be38e35 CL |
276 | static inline void check_highest_zone(int k) |
277 | { | |
278 | } | |
095f1fc4 LS |
279 | |
280 | #ifdef CONFIG_TMPFS | |
a7a88b23 | 281 | static inline int mpol_parse_str(char *str, struct mempolicy **mpol) |
095f1fc4 | 282 | { |
71fe804b | 283 | return 1; /* error */ |
095f1fc4 | 284 | } |
13057efb | 285 | #endif |
095f1fc4 | 286 | |
771fb4d8 LS |
287 | static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma, |
288 | unsigned long address) | |
289 | { | |
290 | return -1; /* no node preference */ | |
291 | } | |
292 | ||
c11600e4 DR |
293 | static inline void mpol_put_task_policy(struct task_struct *task) |
294 | { | |
295 | } | |
8ca39e68 MS |
296 | |
297 | static inline nodemask_t *policy_nodemask_current(gfp_t gfp) | |
298 | { | |
299 | return NULL; | |
300 | } | |
20b51af1 | 301 | |
cfcaa66f BW |
302 | static inline bool mpol_is_preferred_many(struct mempolicy *pol) |
303 | { | |
304 | return false; | |
305 | } | |
306 | ||
1da177e4 | 307 | #endif /* CONFIG_NUMA */ |
1da177e4 | 308 | #endif |