]>
Commit | Line | Data |
---|---|---|
1 | /* SPDX-License-Identifier: GPL-2.0 */ | |
2 | /* | |
3 | * NUMA memory policies for Linux. | |
4 | * Copyright 2003,2004 Andi Kleen SuSE Labs | |
5 | */ | |
6 | #ifndef _LINUX_MEMPOLICY_H | |
7 | #define _LINUX_MEMPOLICY_H 1 | |
8 | ||
9 | ||
10 | #include <linux/mmzone.h> | |
11 | #include <linux/dax.h> | |
12 | #include <linux/slab.h> | |
13 | #include <linux/rbtree.h> | |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/nodemask.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <uapi/linux/mempolicy.h> | |
18 | ||
19 | struct mm_struct; | |
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 | |
34 | * mmap_sem. | |
35 | * | |
36 | * Freeing policy: | |
37 | * Mempolicy objects are reference counted. A mempolicy will be freed when | |
38 | * mpol_put() decrements the reference count to zero. | |
39 | * | |
40 | * Duplicating policy objects: | |
41 | * mpol_dup() allocates a new mempolicy and copies the specified mempolicy | |
42 | * to the new storage. The reference count of the new object is initialized | |
43 | * to 1, representing the caller of mpol_dup(). | |
44 | */ | |
45 | struct mempolicy { | |
46 | atomic_t refcnt; | |
47 | unsigned short mode; /* See MPOL_* above */ | |
48 | unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ | |
49 | union { | |
50 | short preferred_node; /* preferred */ | |
51 | nodemask_t nodes; /* interleave/bind */ | |
52 | /* undefined for default */ | |
53 | } v; | |
54 | union { | |
55 | nodemask_t cpuset_mems_allowed; /* relative to these nodes */ | |
56 | nodemask_t user_nodemask; /* nodemask passed by user */ | |
57 | } w; | |
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 | ||
65 | extern void __mpol_put(struct mempolicy *pol); | |
66 | static inline void mpol_put(struct mempolicy *pol) | |
67 | { | |
68 | if (pol) | |
69 | __mpol_put(pol); | |
70 | } | |
71 | ||
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 | ||
87 | extern struct mempolicy *__mpol_dup(struct mempolicy *pol); | |
88 | static inline struct mempolicy *mpol_dup(struct mempolicy *pol) | |
89 | { | |
90 | if (pol) | |
91 | pol = __mpol_dup(pol); | |
92 | return pol; | |
93 | } | |
94 | ||
95 | #define vma_policy(vma) ((vma)->vm_policy) | |
96 | ||
97 | static inline void mpol_get(struct mempolicy *pol) | |
98 | { | |
99 | if (pol) | |
100 | atomic_inc(&pol->refcnt); | |
101 | } | |
102 | ||
103 | extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b); | |
104 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
105 | { | |
106 | if (a == b) | |
107 | return true; | |
108 | return __mpol_equal(a, b); | |
109 | } | |
110 | ||
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; | |
127 | rwlock_t lock; | |
128 | }; | |
129 | ||
130 | int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst); | |
131 | void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol); | |
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 | ||
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); | |
142 | bool vma_policy_mof(struct vm_area_struct *vma); | |
143 | ||
144 | extern void numa_default_policy(void); | |
145 | extern void numa_policy_init(void); | |
146 | extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new); | |
147 | extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); | |
148 | ||
149 | extern int huge_node(struct vm_area_struct *vma, | |
150 | unsigned long addr, gfp_t gfp_flags, | |
151 | struct mempolicy **mpol, nodemask_t **nodemask); | |
152 | extern bool init_nodemask_of_mempolicy(nodemask_t *mask); | |
153 | extern bool mempolicy_nodemask_intersects(struct task_struct *tsk, | |
154 | const nodemask_t *mask); | |
155 | extern unsigned int mempolicy_slab_node(void); | |
156 | ||
157 | extern enum zone_type policy_zone; | |
158 | ||
159 | static inline void check_highest_zone(enum zone_type k) | |
160 | { | |
161 | if (k > policy_zone && k != ZONE_MOVABLE) | |
162 | policy_zone = k; | |
163 | } | |
164 | ||
165 | int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, | |
166 | const nodemask_t *to, int flags); | |
167 | ||
168 | ||
169 | #ifdef CONFIG_TMPFS | |
170 | extern int mpol_parse_str(char *str, struct mempolicy **mpol); | |
171 | #endif | |
172 | ||
173 | extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol); | |
174 | ||
175 | /* Check if a vma is migratable */ | |
176 | static inline bool vma_migratable(struct vm_area_struct *vma) | |
177 | { | |
178 | if (vma->vm_flags & (VM_IO | VM_PFNMAP)) | |
179 | return false; | |
180 | ||
181 | /* | |
182 | * DAX device mappings require predictable access latency, so avoid | |
183 | * incurring periodic faults. | |
184 | */ | |
185 | if (vma_is_dax(vma)) | |
186 | return false; | |
187 | ||
188 | #ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION | |
189 | if (vma->vm_flags & VM_HUGETLB) | |
190 | return false; | |
191 | #endif | |
192 | ||
193 | /* | |
194 | * Migration allocates pages in the highest zone. If we cannot | |
195 | * do so then migration (at least from node to node) is not | |
196 | * possible. | |
197 | */ | |
198 | if (vma->vm_file && | |
199 | gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping)) | |
200 | < policy_zone) | |
201 | return false; | |
202 | return true; | |
203 | } | |
204 | ||
205 | extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long); | |
206 | extern void mpol_put_task_policy(struct task_struct *); | |
207 | ||
208 | #else | |
209 | ||
210 | struct mempolicy {}; | |
211 | ||
212 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
213 | { | |
214 | return true; | |
215 | } | |
216 | ||
217 | static inline void mpol_put(struct mempolicy *p) | |
218 | { | |
219 | } | |
220 | ||
221 | static inline void mpol_cond_put(struct mempolicy *pol) | |
222 | { | |
223 | } | |
224 | ||
225 | static inline void mpol_get(struct mempolicy *pol) | |
226 | { | |
227 | } | |
228 | ||
229 | struct shared_policy {}; | |
230 | ||
231 | static inline void mpol_shared_policy_init(struct shared_policy *sp, | |
232 | struct mempolicy *mpol) | |
233 | { | |
234 | } | |
235 | ||
236 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
237 | { | |
238 | } | |
239 | ||
240 | static inline struct mempolicy * | |
241 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
242 | { | |
243 | return NULL; | |
244 | } | |
245 | ||
246 | #define vma_policy(vma) NULL | |
247 | ||
248 | static inline int | |
249 | vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst) | |
250 | { | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static inline void numa_policy_init(void) | |
255 | { | |
256 | } | |
257 | ||
258 | static inline void numa_default_policy(void) | |
259 | { | |
260 | } | |
261 | ||
262 | static inline void mpol_rebind_task(struct task_struct *tsk, | |
263 | const nodemask_t *new) | |
264 | { | |
265 | } | |
266 | ||
267 | static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) | |
268 | { | |
269 | } | |
270 | ||
271 | static inline int huge_node(struct vm_area_struct *vma, | |
272 | unsigned long addr, gfp_t gfp_flags, | |
273 | struct mempolicy **mpol, nodemask_t **nodemask) | |
274 | { | |
275 | *mpol = NULL; | |
276 | *nodemask = NULL; | |
277 | return 0; | |
278 | } | |
279 | ||
280 | static inline bool init_nodemask_of_mempolicy(nodemask_t *m) | |
281 | { | |
282 | return false; | |
283 | } | |
284 | ||
285 | static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, | |
286 | const nodemask_t *to, int flags) | |
287 | { | |
288 | return 0; | |
289 | } | |
290 | ||
291 | static inline void check_highest_zone(int k) | |
292 | { | |
293 | } | |
294 | ||
295 | #ifdef CONFIG_TMPFS | |
296 | static inline int mpol_parse_str(char *str, struct mempolicy **mpol) | |
297 | { | |
298 | return 1; /* error */ | |
299 | } | |
300 | #endif | |
301 | ||
302 | static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma, | |
303 | unsigned long address) | |
304 | { | |
305 | return -1; /* no node preference */ | |
306 | } | |
307 | ||
308 | static inline void mpol_put_task_policy(struct task_struct *task) | |
309 | { | |
310 | } | |
311 | #endif /* CONFIG_NUMA */ | |
312 | #endif |