1
2
3
4
5#ifndef _LINUX_MEMPOLICY_H
6#define _LINUX_MEMPOLICY_H 1
7
8
9#include <linux/mmzone.h>
10#include <linux/slab.h>
11#include <linux/rbtree.h>
12#include <linux/spinlock.h>
13#include <linux/nodemask.h>
14#include <linux/pagemap.h>
15#include <uapi/linux/mempolicy.h>
16
17struct mm_struct;
18
19#ifdef CONFIG_NUMA
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43struct mempolicy {
44 atomic_t refcnt;
45 unsigned short mode;
46 unsigned short flags;
47 union {
48 short preferred_node;
49 nodemask_t nodes;
50
51 } v;
52 union {
53 nodemask_t cpuset_mems_allowed;
54 nodemask_t user_nodemask;
55 } w;
56};
57
58
59
60
61
62
63extern void __mpol_put(struct mempolicy *pol);
64static inline void mpol_put(struct mempolicy *pol)
65{
66 if (pol)
67 __mpol_put(pol);
68}
69
70
71
72
73
74static inline int mpol_needs_cond_ref(struct mempolicy *pol)
75{
76 return (pol && (pol->flags & MPOL_F_SHARED));
77}
78
79static inline void mpol_cond_put(struct mempolicy *pol)
80{
81 if (mpol_needs_cond_ref(pol))
82 __mpol_put(pol);
83}
84
85extern struct mempolicy *__mpol_dup(struct mempolicy *pol);
86static inline struct mempolicy *mpol_dup(struct mempolicy *pol)
87{
88 if (pol)
89 pol = __mpol_dup(pol);
90 return pol;
91}
92
93#define vma_policy(vma) ((vma)->vm_policy)
94
95static inline void mpol_get(struct mempolicy *pol)
96{
97 if (pol)
98 atomic_inc(&pol->refcnt);
99}
100
101extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b);
102static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
103{
104 if (a == b)
105 return true;
106 return __mpol_equal(a, b);
107}
108
109
110
111
112
113
114
115
116
117struct sp_node {
118 struct rb_node nd;
119 unsigned long start, end;
120 struct mempolicy *policy;
121};
122
123struct shared_policy {
124 struct rb_root root;
125 spinlock_t lock;
126};
127
128int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst);
129void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
130int mpol_set_shared_policy(struct shared_policy *info,
131 struct vm_area_struct *vma,
132 struct mempolicy *new);
133void mpol_free_shared_policy(struct shared_policy *p);
134struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
135 unsigned long idx);
136
137struct mempolicy *get_vma_policy(struct task_struct *tsk,
138 struct vm_area_struct *vma, unsigned long addr);
139
140extern void numa_default_policy(void);
141extern void numa_policy_init(void);
142extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new,
143 enum mpol_rebind_step step);
144extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
145extern void mpol_fix_fork_child_flag(struct task_struct *p);
146
147extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
148 unsigned long addr, gfp_t gfp_flags,
149 struct mempolicy **mpol, nodemask_t **nodemask);
150extern bool init_nodemask_of_mempolicy(nodemask_t *mask);
151extern bool mempolicy_nodemask_intersects(struct task_struct *tsk,
152 const nodemask_t *mask);
153extern unsigned slab_node(void);
154
155extern enum zone_type policy_zone;
156
157static inline void check_highest_zone(enum zone_type k)
158{
159 if (k > policy_zone && k != ZONE_MOVABLE)
160 policy_zone = k;
161}
162
163int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
164 const nodemask_t *to, int flags);
165
166
167#ifdef CONFIG_TMPFS
168extern int mpol_parse_str(char *str, struct mempolicy **mpol);
169#endif
170
171extern int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
172
173
174static inline int vma_migratable(struct vm_area_struct *vma)
175{
176 if (vma->vm_flags & (VM_IO | VM_PFNMAP))
177 return 0;
178
179
180
181
182
183 if (vma->vm_file &&
184 gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
185 < policy_zone)
186 return 0;
187 return 1;
188}
189
190extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long);
191
192#else
193
194struct mempolicy {};
195
196static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
197{
198 return true;
199}
200
201static inline void mpol_put(struct mempolicy *p)
202{
203}
204
205static inline void mpol_cond_put(struct mempolicy *pol)
206{
207}
208
209static inline void mpol_get(struct mempolicy *pol)
210{
211}
212
213static inline struct mempolicy *mpol_dup(struct mempolicy *old)
214{
215 return NULL;
216}
217
218struct shared_policy {};
219
220static inline int mpol_set_shared_policy(struct shared_policy *info,
221 struct vm_area_struct *vma,
222 struct mempolicy *new)
223{
224 return -EINVAL;
225}
226
227static inline void mpol_shared_policy_init(struct shared_policy *sp,
228 struct mempolicy *mpol)
229{
230}
231
232static inline void mpol_free_shared_policy(struct shared_policy *p)
233{
234}
235
236static inline struct mempolicy *
237mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
238{
239 return NULL;
240}
241
242#define vma_policy(vma) NULL
243
244static inline int
245vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
246{
247 return 0;
248}
249
250static inline void numa_policy_init(void)
251{
252}
253
254static inline void numa_default_policy(void)
255{
256}
257
258static inline void mpol_rebind_task(struct task_struct *tsk,
259 const nodemask_t *new,
260 enum mpol_rebind_step step)
261{
262}
263
264static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
265{
266}
267
268static inline void mpol_fix_fork_child_flag(struct task_struct *p)
269{
270}
271
272static 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
281static inline bool init_nodemask_of_mempolicy(nodemask_t *m)
282{
283 return false;
284}
285
286static inline bool mempolicy_nodemask_intersects(struct task_struct *tsk,
287 const nodemask_t *mask)
288{
289 return false;
290}
291
292static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
293 const nodemask_t *to, int flags)
294{
295 return 0;
296}
297
298static inline void check_highest_zone(int k)
299{
300}
301
302#ifdef CONFIG_TMPFS
303static inline int mpol_parse_str(char *str, struct mempolicy **mpol)
304{
305 return 1;
306}
307#endif
308
309static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol)
310{
311 return 0;
312}
313
314static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma,
315 unsigned long address)
316{
317 return -1;
318}
319
320#endif
321#endif
322