1#ifndef _LINUX_MEMPOLICY_H
2#define _LINUX_MEMPOLICY_H 1
3
4#include <linux/errno.h>
5
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17
18enum {
19 MPOL_DEFAULT,
20 MPOL_PREFERRED,
21 MPOL_BIND,
22 MPOL_INTERLEAVE,
23 MPOL_MAX,
24};
25
26enum mpol_rebind_step {
27 MPOL_REBIND_ONCE,
28 MPOL_REBIND_STEP1,
29 MPOL_REBIND_STEP2,
30 MPOL_REBIND_NSTEP,
31};
32
33
34#define MPOL_F_STATIC_NODES (1 << 15)
35#define MPOL_F_RELATIVE_NODES (1 << 14)
36
37
38
39
40
41#define MPOL_MODE_FLAGS (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES)
42
43
44#define MPOL_F_NODE (1<<0)
45#define MPOL_F_ADDR (1<<1)
46#define MPOL_F_MEMS_ALLOWED (1<<2)
47
48
49#define MPOL_MF_STRICT (1<<0)
50#define MPOL_MF_MOVE (1<<1)
51#define MPOL_MF_MOVE_ALL (1<<2)
52#define MPOL_MF_INTERNAL (1<<3)
53
54
55
56
57
58
59#define MPOL_F_SHARED (1 << 0)
60#define MPOL_F_LOCAL (1 << 1)
61#define MPOL_F_REBINDING (1 << 2)
62
63#ifdef __KERNEL__
64
65#include <linux/mmzone.h>
66#include <linux/slab.h>
67#include <linux/rbtree.h>
68#include <linux/spinlock.h>
69#include <linux/nodemask.h>
70#include <linux/pagemap.h>
71
72struct mm_struct;
73
74#ifdef CONFIG_NUMA
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98struct mempolicy {
99 atomic_t refcnt;
100 unsigned short mode;
101 unsigned short flags;
102 union {
103 short preferred_node;
104 nodemask_t nodes;
105
106 } v;
107 union {
108 nodemask_t cpuset_mems_allowed;
109 nodemask_t user_nodemask;
110 } w;
111};
112
113
114
115
116
117
118extern void __mpol_put(struct mempolicy *pol);
119static inline void mpol_put(struct mempolicy *pol)
120{
121 if (pol)
122 __mpol_put(pol);
123}
124
125
126
127
128
129static inline int mpol_needs_cond_ref(struct mempolicy *pol)
130{
131 return (pol && (pol->flags & MPOL_F_SHARED));
132}
133
134static inline void mpol_cond_put(struct mempolicy *pol)
135{
136 if (mpol_needs_cond_ref(pol))
137 __mpol_put(pol);
138}
139
140extern struct mempolicy *__mpol_cond_copy(struct mempolicy *tompol,
141 struct mempolicy *frompol);
142static inline struct mempolicy *mpol_cond_copy(struct mempolicy *tompol,
143 struct mempolicy *frompol)
144{
145 if (!frompol)
146 return frompol;
147 return __mpol_cond_copy(tompol, frompol);
148}
149
150extern struct mempolicy *__mpol_dup(struct mempolicy *pol);
151static inline struct mempolicy *mpol_dup(struct mempolicy *pol)
152{
153 if (pol)
154 pol = __mpol_dup(pol);
155 return pol;
156}
157
158#define vma_policy(vma) ((vma)->vm_policy)
159#define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol))
160
161static inline void mpol_get(struct mempolicy *pol)
162{
163 if (pol)
164 atomic_inc(&pol->refcnt);
165}
166
167extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b);
168static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b)
169{
170 if (a == b)
171 return 1;
172 return __mpol_equal(a, b);
173}
174
175
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180
181
182
183struct sp_node {
184 struct rb_node nd;
185 unsigned long start, end;
186 struct mempolicy *policy;
187};
188
189struct shared_policy {
190 struct rb_root root;
191 spinlock_t lock;
192};
193
194void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
195int mpol_set_shared_policy(struct shared_policy *info,
196 struct vm_area_struct *vma,
197 struct mempolicy *new);
198void mpol_free_shared_policy(struct shared_policy *p);
199struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
200 unsigned long idx);
201
202extern void numa_default_policy(void);
203extern void numa_policy_init(void);
204extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new,
205 enum mpol_rebind_step step);
206extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
207extern void mpol_fix_fork_child_flag(struct task_struct *p);
208
209extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
210 unsigned long addr, gfp_t gfp_flags,
211 struct mempolicy **mpol, nodemask_t **nodemask);
212extern bool init_nodemask_of_mempolicy(nodemask_t *mask);
213extern bool mempolicy_nodemask_intersects(struct task_struct *tsk,
214 const nodemask_t *mask);
215extern unsigned slab_node(struct mempolicy *policy);
216
217extern enum zone_type policy_zone;
218
219static inline void check_highest_zone(enum zone_type k)
220{
221 if (k > policy_zone && k != ZONE_MOVABLE)
222 policy_zone = k;
223}
224
225int do_migrate_pages(struct mm_struct *mm,
226 const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags);
227
228
229#ifdef CONFIG_TMPFS
230extern int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context);
231
232extern int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol,
233 int no_context);
234#endif
235
236
237static inline int vma_migratable(struct vm_area_struct *vma)
238{
239 if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
240 return 0;
241
242
243
244
245
246 if (vma->vm_file &&
247 gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
248 < policy_zone)
249 return 0;
250 return 1;
251}
252
253#else
254
255struct mempolicy {};
256
257static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b)
258{
259 return 1;
260}
261
262static inline void mpol_put(struct mempolicy *p)
263{
264}
265
266static inline void mpol_cond_put(struct mempolicy *pol)
267{
268}
269
270static inline struct mempolicy *mpol_cond_copy(struct mempolicy *to,
271 struct mempolicy *from)
272{
273 return from;
274}
275
276static inline void mpol_get(struct mempolicy *pol)
277{
278}
279
280static inline struct mempolicy *mpol_dup(struct mempolicy *old)
281{
282 return NULL;
283}
284
285struct shared_policy {};
286
287static inline int mpol_set_shared_policy(struct shared_policy *info,
288 struct vm_area_struct *vma,
289 struct mempolicy *new)
290{
291 return -EINVAL;
292}
293
294static inline void mpol_shared_policy_init(struct shared_policy *sp,
295 struct mempolicy *mpol)
296{
297}
298
299static inline void mpol_free_shared_policy(struct shared_policy *p)
300{
301}
302
303static inline struct mempolicy *
304mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
305{
306 return NULL;
307}
308
309#define vma_policy(vma) NULL
310#define vma_set_policy(vma, pol) do {} while(0)
311
312static inline void numa_policy_init(void)
313{
314}
315
316static inline void numa_default_policy(void)
317{
318}
319
320static inline void mpol_rebind_task(struct task_struct *tsk,
321 const nodemask_t *new,
322 enum mpol_rebind_step step)
323{
324}
325
326static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
327{
328}
329
330static inline void mpol_fix_fork_child_flag(struct task_struct *p)
331{
332}
333
334static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
335 unsigned long addr, gfp_t gfp_flags,
336 struct mempolicy **mpol, nodemask_t **nodemask)
337{
338 *mpol = NULL;
339 *nodemask = NULL;
340 return node_zonelist(0, gfp_flags);
341}
342
343static inline bool init_nodemask_of_mempolicy(nodemask_t *m)
344{
345 return false;
346}
347
348static inline bool mempolicy_nodemask_intersects(struct task_struct *tsk,
349 const nodemask_t *mask)
350{
351 return false;
352}
353
354static inline int do_migrate_pages(struct mm_struct *mm,
355 const nodemask_t *from_nodes,
356 const nodemask_t *to_nodes, int flags)
357{
358 return 0;
359}
360
361static inline void check_highest_zone(int k)
362{
363}
364
365#ifdef CONFIG_TMPFS
366static inline int mpol_parse_str(char *str, struct mempolicy **mpol,
367 int no_context)
368{
369 return 1;
370}
371
372static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol,
373 int no_context)
374{
375 return 0;
376}
377#endif
378
379#endif
380#endif
381
382#endif
383