]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * NUMA memory policies for Linux. | |
3 | * Copyright 2003,2004 Andi Kleen SuSE Labs | |
4 | */ | |
5 | #ifndef _LINUX_MEMPOLICY_H | |
6 | #define _LINUX_MEMPOLICY_H 1 | |
7 | ||
8 | ||
9 | #include <linux/mmzone.h> | |
10 | #include <linux/dax.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/rbtree.h> | |
13 | #include <linux/spinlock.h> | |
14 | #include <linux/nodemask.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <uapi/linux/mempolicy.h> | |
17 | ||
18 | struct mm_struct; | |
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 | * | |
30 | * Locking policy for interlave: | |
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 | |
33 | * mmap_sem. | |
34 | * | |
35 | * Freeing policy: | |
36 | * Mempolicy objects are reference counted. A mempolicy will be freed when | |
37 | * mpol_put() decrements the reference count to zero. | |
38 | * | |
39 | * Duplicating policy objects: | |
40 | * mpol_dup() allocates a new mempolicy and copies the specified mempolicy | |
41 | * to the new storage. The reference count of the new object is initialized | |
42 | * to 1, representing the caller of mpol_dup(). | |
43 | */ | |
44 | struct mempolicy { | |
45 | atomic_t refcnt; | |
46 | unsigned short mode; /* See MPOL_* above */ | |
47 | unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ | |
48 | union { | |
49 | short preferred_node; /* preferred */ | |
50 | nodemask_t nodes; /* interleave/bind */ | |
51 | /* undefined for default */ | |
52 | } v; | |
53 | union { | |
54 | nodemask_t cpuset_mems_allowed; /* relative to these nodes */ | |
55 | nodemask_t user_nodemask; /* nodemask passed by user */ | |
56 | } w; | |
57 | }; | |
58 | ||
59 | /* | |
60 | * Support for managing mempolicy data objects (clone, copy, destroy) | |
61 | * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. | |
62 | */ | |
63 | ||
64 | extern void __mpol_put(struct mempolicy *pol); | |
65 | static inline void mpol_put(struct mempolicy *pol) | |
66 | { | |
67 | if (pol) | |
68 | __mpol_put(pol); | |
69 | } | |
70 | ||
71 | /* | |
72 | * Does mempolicy pol need explicit unref after use? | |
73 | * Currently only needed for shared policies. | |
74 | */ | |
75 | static inline int mpol_needs_cond_ref(struct mempolicy *pol) | |
76 | { | |
77 | return (pol && (pol->flags & MPOL_F_SHARED)); | |
78 | } | |
79 | ||
80 | static inline void mpol_cond_put(struct mempolicy *pol) | |
81 | { | |
82 | if (mpol_needs_cond_ref(pol)) | |
83 | __mpol_put(pol); | |
84 | } | |
85 | ||
86 | extern struct mempolicy *__mpol_dup(struct mempolicy *pol); | |
87 | static inline struct mempolicy *mpol_dup(struct mempolicy *pol) | |
88 | { | |
89 | if (pol) | |
90 | pol = __mpol_dup(pol); | |
91 | return pol; | |
92 | } | |
93 | ||
94 | #define vma_policy(vma) ((vma)->vm_policy) | |
95 | ||
96 | static inline void mpol_get(struct mempolicy *pol) | |
97 | { | |
98 | if (pol) | |
99 | atomic_inc(&pol->refcnt); | |
100 | } | |
101 | ||
102 | extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b); | |
103 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
104 | { | |
105 | if (a == b) | |
106 | return true; | |
107 | return __mpol_equal(a, b); | |
108 | } | |
109 | ||
110 | /* | |
111 | * Tree of shared policies for a shared memory region. | |
112 | * Maintain the policies in a pseudo mm that contains vmas. The vmas | |
113 | * carry the policy. As a special twist the pseudo mm is indexed in pages, not | |
114 | * bytes, so that we can work with shared memory segments bigger than | |
115 | * unsigned long. | |
116 | */ | |
117 | ||
118 | struct sp_node { | |
119 | struct rb_node nd; | |
120 | unsigned long start, end; | |
121 | struct mempolicy *policy; | |
122 | }; | |
123 | ||
124 | struct shared_policy { | |
125 | struct rb_root root; | |
126 | rwlock_t lock; | |
127 | }; | |
128 | ||
129 | int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst); | |
130 | void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol); | |
131 | int mpol_set_shared_policy(struct shared_policy *info, | |
132 | struct vm_area_struct *vma, | |
133 | struct mempolicy *new); | |
134 | void mpol_free_shared_policy(struct shared_policy *p); | |
135 | struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, | |
136 | unsigned long idx); | |
137 | ||
138 | struct mempolicy *get_task_policy(struct task_struct *p); | |
139 | struct mempolicy *__get_vma_policy(struct vm_area_struct *vma, | |
140 | unsigned long addr); | |
141 | bool vma_policy_mof(struct vm_area_struct *vma); | |
142 | ||
143 | extern void numa_default_policy(void); | |
144 | extern void numa_policy_init(void); | |
145 | extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new, | |
146 | enum mpol_rebind_step step); | |
147 | extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); | |
148 | ||
149 | extern struct zonelist *huge_zonelist(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 | enum mpol_rebind_step step) | |
265 | { | |
266 | } | |
267 | ||
268 | static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) | |
269 | { | |
270 | } | |
271 | ||
272 | static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, | |
273 | unsigned long addr, gfp_t gfp_flags, | |
274 | struct mempolicy **mpol, nodemask_t **nodemask) | |
275 | { | |
276 | *mpol = NULL; | |
277 | *nodemask = NULL; | |
278 | return node_zonelist(0, gfp_flags); | |
279 | } | |
280 | ||
281 | static inline bool init_nodemask_of_mempolicy(nodemask_t *m) | |
282 | { | |
283 | return false; | |
284 | } | |
285 | ||
286 | static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, | |
287 | const nodemask_t *to, int flags) | |
288 | { | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static inline void check_highest_zone(int k) | |
293 | { | |
294 | } | |
295 | ||
296 | #ifdef CONFIG_TMPFS | |
297 | static inline int mpol_parse_str(char *str, struct mempolicy **mpol) | |
298 | { | |
299 | return 1; /* error */ | |
300 | } | |
301 | #endif | |
302 | ||
303 | static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma, | |
304 | unsigned long address) | |
305 | { | |
306 | return -1; /* no node preference */ | |
307 | } | |
308 | ||
309 | static inline void mpol_put_task_policy(struct task_struct *task) | |
310 | { | |
311 | } | |
312 | #endif /* CONFIG_NUMA */ | |
313 | #endif |