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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
19struct mm_struct;
20
21#ifdef CONFIG_NUMA
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45struct mempolicy {
46 atomic_t refcnt;
47 unsigned short mode;
48 unsigned short flags;
49 union {
50 short preferred_node;
51 nodemask_t nodes;
52
53 } v;
54 union {
55 nodemask_t cpuset_mems_allowed;
56 nodemask_t user_nodemask;
57 } w;
58};
59
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64
65extern void __mpol_put(struct mempolicy *pol);
66static inline void mpol_put(struct mempolicy *pol)
67{
68 if (pol)
69 __mpol_put(pol);
70}
71
72
73
74
75
76static inline int mpol_needs_cond_ref(struct mempolicy *pol)
77{
78 return (pol && (pol->flags & MPOL_F_SHARED));
79}
80
81static inline void mpol_cond_put(struct mempolicy *pol)
82{
83 if (mpol_needs_cond_ref(pol))
84 __mpol_put(pol);
85}
86
87extern struct mempolicy *__mpol_dup(struct mempolicy *pol);
88static 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
97static inline void mpol_get(struct mempolicy *pol)
98{
99 if (pol)
100 atomic_inc(&pol->refcnt);
101}
102
103extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b);
104static 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
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117
118
119struct sp_node {
120 struct rb_node nd;
121 unsigned long start, end;
122 struct mempolicy *policy;
123};
124
125struct shared_policy {
126 struct rb_root root;
127 rwlock_t lock;
128};
129
130int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst);
131void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
132int mpol_set_shared_policy(struct shared_policy *info,
133 struct vm_area_struct *vma,
134 struct mempolicy *new);
135void mpol_free_shared_policy(struct shared_policy *p);
136struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
137 unsigned long idx);
138
139struct mempolicy *get_task_policy(struct task_struct *p);
140struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
141 unsigned long addr);
142struct mempolicy *get_vma_policy(struct vm_area_struct *vma,
143 unsigned long addr);
144bool vma_policy_mof(struct vm_area_struct *vma);
145
146extern void numa_default_policy(void);
147extern void numa_policy_init(void);
148extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new);
149extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
150
151extern int huge_node(struct vm_area_struct *vma,
152 unsigned long addr, gfp_t gfp_flags,
153 struct mempolicy **mpol, nodemask_t **nodemask);
154extern bool init_nodemask_of_mempolicy(nodemask_t *mask);
155extern bool mempolicy_nodemask_intersects(struct task_struct *tsk,
156 const nodemask_t *mask);
157extern unsigned int mempolicy_slab_node(void);
158
159extern enum zone_type policy_zone;
160
161static inline void check_highest_zone(enum zone_type k)
162{
163 if (k > policy_zone && k != ZONE_MOVABLE)
164 policy_zone = k;
165}
166
167int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
168 const nodemask_t *to, int flags);
169
170
171#ifdef CONFIG_TMPFS
172extern int mpol_parse_str(char *str, struct mempolicy **mpol);
173#endif
174
175extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
176
177
178static inline bool vma_migratable(struct vm_area_struct *vma)
179{
180 if (vma->vm_flags & (VM_IO | VM_PFNMAP))
181 return false;
182
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186
187 if (vma_is_dax(vma))
188 return false;
189
190#ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
191 if (vma->vm_flags & VM_HUGETLB)
192 return false;
193#endif
194
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197
198
199
200 if (vma->vm_file &&
201 gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
202 < policy_zone)
203 return false;
204 return true;
205}
206
207extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long);
208extern void mpol_put_task_policy(struct task_struct *);
209
210#else
211
212struct mempolicy {};
213
214static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
215{
216 return true;
217}
218
219static inline void mpol_put(struct mempolicy *p)
220{
221}
222
223static inline void mpol_cond_put(struct mempolicy *pol)
224{
225}
226
227static inline void mpol_get(struct mempolicy *pol)
228{
229}
230
231struct shared_policy {};
232
233static inline void mpol_shared_policy_init(struct shared_policy *sp,
234 struct mempolicy *mpol)
235{
236}
237
238static inline void mpol_free_shared_policy(struct shared_policy *p)
239{
240}
241
242static inline struct mempolicy *
243mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
244{
245 return NULL;
246}
247
248#define vma_policy(vma) NULL
249
250static inline int
251vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
252{
253 return 0;
254}
255
256static inline void numa_policy_init(void)
257{
258}
259
260static inline void numa_default_policy(void)
261{
262}
263
264static inline void mpol_rebind_task(struct task_struct *tsk,
265 const nodemask_t *new)
266{
267}
268
269static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
270{
271}
272
273static inline int huge_node(struct vm_area_struct *vma,
274 unsigned long addr, gfp_t gfp_flags,
275 struct mempolicy **mpol, nodemask_t **nodemask)
276{
277 *mpol = NULL;
278 *nodemask = NULL;
279 return 0;
280}
281
282static inline bool init_nodemask_of_mempolicy(nodemask_t *m)
283{
284 return false;
285}
286
287static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
288 const nodemask_t *to, int flags)
289{
290 return 0;
291}
292
293static inline void check_highest_zone(int k)
294{
295}
296
297#ifdef CONFIG_TMPFS
298static inline int mpol_parse_str(char *str, struct mempolicy **mpol)
299{
300 return 1;
301}
302#endif
303
304static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma,
305 unsigned long address)
306{
307 return -1;
308}
309
310static inline void mpol_put_task_policy(struct task_struct *task)
311{
312}
313#endif
314#endif
315