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1da177e4 LT |
1 | #ifndef _LINUX_MEMPOLICY_H |
2 | #define _LINUX_MEMPOLICY_H 1 | |
3 | ||
4 | #include <linux/errno.h> | |
5 | ||
6 | /* | |
7 | * NUMA memory policies for Linux. | |
8 | * Copyright 2003,2004 Andi Kleen SuSE Labs | |
9 | */ | |
10 | ||
028fec41 DR |
11 | /* |
12 | * Both the MPOL_* mempolicy mode and the MPOL_F_* optional mode flags are | |
13 | * passed by the user to either set_mempolicy() or mbind() in an 'int' actual. | |
14 | * The MPOL_MODE_FLAGS macro determines the legal set of optional mode flags. | |
15 | */ | |
16 | ||
1da177e4 | 17 | /* Policies */ |
a3b51e01 DR |
18 | enum { |
19 | MPOL_DEFAULT, | |
20 | MPOL_PREFERRED, | |
21 | MPOL_BIND, | |
22 | MPOL_INTERLEAVE, | |
23 | MPOL_MAX, /* always last member of enum */ | |
24 | }; | |
1da177e4 | 25 | |
708c1bbc MX |
26 | enum mpol_rebind_step { |
27 | MPOL_REBIND_ONCE, /* do rebind work at once(not by two step) */ | |
28 | MPOL_REBIND_STEP1, /* first step(set all the newly nodes) */ | |
29 | MPOL_REBIND_STEP2, /* second step(clean all the disallowed nodes)*/ | |
30 | MPOL_REBIND_NSTEP, | |
31 | }; | |
32 | ||
028fec41 | 33 | /* Flags for set_mempolicy */ |
f5b087b5 | 34 | #define MPOL_F_STATIC_NODES (1 << 15) |
4c50bc01 | 35 | #define MPOL_F_RELATIVE_NODES (1 << 14) |
f5b087b5 | 36 | |
028fec41 DR |
37 | /* |
38 | * MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to | |
39 | * either set_mempolicy() or mbind(). | |
40 | */ | |
4c50bc01 | 41 | #define MPOL_MODE_FLAGS (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES) |
028fec41 DR |
42 | |
43 | /* Flags for get_mempolicy */ | |
1da177e4 LT |
44 | #define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */ |
45 | #define MPOL_F_ADDR (1<<1) /* look up vma using address */ | |
754af6f5 | 46 | #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */ |
1da177e4 LT |
47 | |
48 | /* Flags for mbind */ | |
49 | #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */ | |
dc9aa5b9 CL |
50 | #define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform to mapping */ |
51 | #define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to mapping */ | |
52 | #define MPOL_MF_INTERNAL (1<<3) /* Internal flags start here */ | |
1da177e4 | 53 | |
aab0b102 LS |
54 | /* |
55 | * Internal flags that share the struct mempolicy flags word with | |
56 | * "mode flags". These flags are allocated from bit 0 up, as they | |
57 | * are never OR'ed into the mode in mempolicy API arguments. | |
58 | */ | |
59 | #define MPOL_F_SHARED (1 << 0) /* identify shared policies */ | |
fc36b8d3 | 60 | #define MPOL_F_LOCAL (1 << 1) /* preferred local allocation */ |
708c1bbc | 61 | #define MPOL_F_REBINDING (1 << 2) /* identify policies in rebinding */ |
aab0b102 | 62 | |
1da177e4 LT |
63 | #ifdef __KERNEL__ |
64 | ||
1da177e4 | 65 | #include <linux/mmzone.h> |
1da177e4 LT |
66 | #include <linux/slab.h> |
67 | #include <linux/rbtree.h> | |
68 | #include <linux/spinlock.h> | |
dfcd3c0d | 69 | #include <linux/nodemask.h> |
83d1674a | 70 | #include <linux/pagemap.h> |
1da177e4 | 71 | |
45b35a5c | 72 | struct mm_struct; |
1da177e4 LT |
73 | |
74 | #ifdef CONFIG_NUMA | |
75 | ||
76 | /* | |
77 | * Describe a memory policy. | |
78 | * | |
79 | * A mempolicy can be either associated with a process or with a VMA. | |
80 | * For VMA related allocations the VMA policy is preferred, otherwise | |
81 | * the process policy is used. Interrupts ignore the memory policy | |
82 | * of the current process. | |
83 | * | |
84 | * Locking policy for interlave: | |
85 | * In process context there is no locking because only the process accesses | |
86 | * its own state. All vma manipulation is somewhat protected by a down_read on | |
b8072f09 | 87 | * mmap_sem. |
1da177e4 LT |
88 | * |
89 | * Freeing policy: | |
19770b32 | 90 | * Mempolicy objects are reference counted. A mempolicy will be freed when |
f0be3d32 | 91 | * mpol_put() decrements the reference count to zero. |
1da177e4 | 92 | * |
846a16bf LS |
93 | * Duplicating policy objects: |
94 | * mpol_dup() allocates a new mempolicy and copies the specified mempolicy | |
19770b32 | 95 | * to the new storage. The reference count of the new object is initialized |
846a16bf | 96 | * to 1, representing the caller of mpol_dup(). |
1da177e4 LT |
97 | */ |
98 | struct mempolicy { | |
99 | atomic_t refcnt; | |
45c4745a | 100 | unsigned short mode; /* See MPOL_* above */ |
028fec41 | 101 | unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ |
1da177e4 | 102 | union { |
1da177e4 | 103 | short preferred_node; /* preferred */ |
19770b32 | 104 | nodemask_t nodes; /* interleave/bind */ |
1da177e4 LT |
105 | /* undefined for default */ |
106 | } v; | |
f5b087b5 DR |
107 | union { |
108 | nodemask_t cpuset_mems_allowed; /* relative to these nodes */ | |
109 | nodemask_t user_nodemask; /* nodemask passed by user */ | |
110 | } w; | |
1da177e4 LT |
111 | }; |
112 | ||
113 | /* | |
114 | * Support for managing mempolicy data objects (clone, copy, destroy) | |
115 | * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. | |
116 | */ | |
117 | ||
f0be3d32 LS |
118 | extern void __mpol_put(struct mempolicy *pol); |
119 | static inline void mpol_put(struct mempolicy *pol) | |
1da177e4 LT |
120 | { |
121 | if (pol) | |
f0be3d32 | 122 | __mpol_put(pol); |
1da177e4 LT |
123 | } |
124 | ||
52cd3b07 LS |
125 | /* |
126 | * Does mempolicy pol need explicit unref after use? | |
127 | * Currently only needed for shared policies. | |
128 | */ | |
129 | static inline int mpol_needs_cond_ref(struct mempolicy *pol) | |
130 | { | |
131 | return (pol && (pol->flags & MPOL_F_SHARED)); | |
132 | } | |
133 | ||
134 | static inline void mpol_cond_put(struct mempolicy *pol) | |
135 | { | |
136 | if (mpol_needs_cond_ref(pol)) | |
137 | __mpol_put(pol); | |
138 | } | |
139 | ||
140 | extern struct mempolicy *__mpol_cond_copy(struct mempolicy *tompol, | |
141 | struct mempolicy *frompol); | |
142 | static 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 | ||
846a16bf LS |
150 | extern struct mempolicy *__mpol_dup(struct mempolicy *pol); |
151 | static inline struct mempolicy *mpol_dup(struct mempolicy *pol) | |
1da177e4 LT |
152 | { |
153 | if (pol) | |
846a16bf | 154 | pol = __mpol_dup(pol); |
1da177e4 LT |
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 | ||
161 | static inline void mpol_get(struct mempolicy *pol) | |
162 | { | |
163 | if (pol) | |
164 | atomic_inc(&pol->refcnt); | |
165 | } | |
166 | ||
fcfb4dcc KM |
167 | extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b); |
168 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
1da177e4 LT |
169 | { |
170 | if (a == b) | |
fcfb4dcc | 171 | return true; |
1da177e4 LT |
172 | return __mpol_equal(a, b); |
173 | } | |
1da177e4 | 174 | |
1da177e4 LT |
175 | /* |
176 | * Tree of shared policies for a shared memory region. | |
177 | * Maintain the policies in a pseudo mm that contains vmas. The vmas | |
178 | * carry the policy. As a special twist the pseudo mm is indexed in pages, not | |
179 | * bytes, so that we can work with shared memory segments bigger than | |
180 | * unsigned long. | |
181 | */ | |
182 | ||
183 | struct sp_node { | |
184 | struct rb_node nd; | |
185 | unsigned long start, end; | |
186 | struct mempolicy *policy; | |
187 | }; | |
188 | ||
189 | struct shared_policy { | |
190 | struct rb_root root; | |
191 | spinlock_t lock; | |
192 | }; | |
193 | ||
71fe804b | 194 | void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol); |
1da177e4 LT |
195 | int mpol_set_shared_policy(struct shared_policy *info, |
196 | struct vm_area_struct *vma, | |
197 | struct mempolicy *new); | |
198 | void mpol_free_shared_policy(struct shared_policy *p); | |
199 | struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, | |
200 | unsigned long idx); | |
201 | ||
d98f6cb6 SW |
202 | struct mempolicy *get_vma_policy(struct task_struct *tsk, |
203 | struct vm_area_struct *vma, unsigned long addr); | |
204 | ||
1da177e4 LT |
205 | extern void numa_default_policy(void); |
206 | extern void numa_policy_init(void); | |
708c1bbc MX |
207 | extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new, |
208 | enum mpol_rebind_step step); | |
4225399a | 209 | extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); |
c61afb18 | 210 | extern void mpol_fix_fork_child_flag(struct task_struct *p); |
4225399a | 211 | |
5da7ca86 | 212 | extern struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
19770b32 MG |
213 | unsigned long addr, gfp_t gfp_flags, |
214 | struct mempolicy **mpol, nodemask_t **nodemask); | |
06808b08 | 215 | extern bool init_nodemask_of_mempolicy(nodemask_t *mask); |
6f48d0eb DR |
216 | extern bool mempolicy_nodemask_intersects(struct task_struct *tsk, |
217 | const nodemask_t *mask); | |
dc85da15 | 218 | extern unsigned slab_node(struct mempolicy *policy); |
1da177e4 | 219 | |
2f6726e5 | 220 | extern enum zone_type policy_zone; |
4be38e35 | 221 | |
2f6726e5 | 222 | static inline void check_highest_zone(enum zone_type k) |
4be38e35 | 223 | { |
b377fd39 | 224 | if (k > policy_zone && k != ZONE_MOVABLE) |
4be38e35 CL |
225 | policy_zone = k; |
226 | } | |
227 | ||
39743889 CL |
228 | int do_migrate_pages(struct mm_struct *mm, |
229 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags); | |
230 | ||
095f1fc4 LS |
231 | |
232 | #ifdef CONFIG_TMPFS | |
71fe804b | 233 | extern int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context); |
13057efb | 234 | #endif |
095f1fc4 | 235 | |
71fe804b LS |
236 | extern int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, |
237 | int no_context); | |
83d1674a GS |
238 | |
239 | /* Check if a vma is migratable */ | |
240 | static inline int vma_migratable(struct vm_area_struct *vma) | |
241 | { | |
242 | if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED)) | |
243 | return 0; | |
244 | /* | |
245 | * Migration allocates pages in the highest zone. If we cannot | |
246 | * do so then migration (at least from node to node) is not | |
247 | * possible. | |
248 | */ | |
249 | if (vma->vm_file && | |
250 | gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping)) | |
251 | < policy_zone) | |
252 | return 0; | |
253 | return 1; | |
254 | } | |
255 | ||
1da177e4 LT |
256 | #else |
257 | ||
258 | struct mempolicy {}; | |
259 | ||
fcfb4dcc | 260 | static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b) |
1da177e4 | 261 | { |
fcfb4dcc | 262 | return true; |
1da177e4 | 263 | } |
1da177e4 | 264 | |
f0be3d32 | 265 | static inline void mpol_put(struct mempolicy *p) |
1da177e4 LT |
266 | { |
267 | } | |
268 | ||
52cd3b07 LS |
269 | static inline void mpol_cond_put(struct mempolicy *pol) |
270 | { | |
271 | } | |
272 | ||
273 | static inline struct mempolicy *mpol_cond_copy(struct mempolicy *to, | |
274 | struct mempolicy *from) | |
275 | { | |
276 | return from; | |
277 | } | |
278 | ||
1da177e4 LT |
279 | static inline void mpol_get(struct mempolicy *pol) |
280 | { | |
281 | } | |
282 | ||
846a16bf | 283 | static inline struct mempolicy *mpol_dup(struct mempolicy *old) |
1da177e4 LT |
284 | { |
285 | return NULL; | |
286 | } | |
287 | ||
1da177e4 LT |
288 | struct shared_policy {}; |
289 | ||
290 | static inline int mpol_set_shared_policy(struct shared_policy *info, | |
291 | struct vm_area_struct *vma, | |
292 | struct mempolicy *new) | |
293 | { | |
294 | return -EINVAL; | |
295 | } | |
296 | ||
71fe804b LS |
297 | static inline void mpol_shared_policy_init(struct shared_policy *sp, |
298 | struct mempolicy *mpol) | |
1da177e4 LT |
299 | { |
300 | } | |
301 | ||
302 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
303 | { | |
304 | } | |
305 | ||
306 | static inline struct mempolicy * | |
307 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
308 | { | |
309 | return NULL; | |
310 | } | |
311 | ||
312 | #define vma_policy(vma) NULL | |
313 | #define vma_set_policy(vma, pol) do {} while(0) | |
314 | ||
315 | static inline void numa_policy_init(void) | |
316 | { | |
317 | } | |
318 | ||
319 | static inline void numa_default_policy(void) | |
320 | { | |
321 | } | |
322 | ||
74cb2155 | 323 | static inline void mpol_rebind_task(struct task_struct *tsk, |
708c1bbc MX |
324 | const nodemask_t *new, |
325 | enum mpol_rebind_step step) | |
68860ec1 PJ |
326 | { |
327 | } | |
328 | ||
4225399a PJ |
329 | static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
330 | { | |
331 | } | |
332 | ||
c61afb18 PJ |
333 | static inline void mpol_fix_fork_child_flag(struct task_struct *p) |
334 | { | |
335 | } | |
336 | ||
5da7ca86 | 337 | static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
19770b32 MG |
338 | unsigned long addr, gfp_t gfp_flags, |
339 | struct mempolicy **mpol, nodemask_t **nodemask) | |
5da7ca86 | 340 | { |
19770b32 MG |
341 | *mpol = NULL; |
342 | *nodemask = NULL; | |
0e88460d | 343 | return node_zonelist(0, gfp_flags); |
5da7ca86 CL |
344 | } |
345 | ||
6f48d0eb DR |
346 | static inline bool init_nodemask_of_mempolicy(nodemask_t *m) |
347 | { | |
348 | return false; | |
349 | } | |
350 | ||
351 | static inline bool mempolicy_nodemask_intersects(struct task_struct *tsk, | |
352 | const nodemask_t *mask) | |
353 | { | |
354 | return false; | |
355 | } | |
06808b08 | 356 | |
45b07ef3 PJ |
357 | static inline int do_migrate_pages(struct mm_struct *mm, |
358 | const nodemask_t *from_nodes, | |
359 | const nodemask_t *to_nodes, int flags) | |
360 | { | |
361 | return 0; | |
362 | } | |
363 | ||
4be38e35 CL |
364 | static inline void check_highest_zone(int k) |
365 | { | |
366 | } | |
095f1fc4 LS |
367 | |
368 | #ifdef CONFIG_TMPFS | |
71fe804b LS |
369 | static inline int mpol_parse_str(char *str, struct mempolicy **mpol, |
370 | int no_context) | |
095f1fc4 | 371 | { |
71fe804b | 372 | return 1; /* error */ |
095f1fc4 | 373 | } |
13057efb | 374 | #endif |
095f1fc4 | 375 | |
71fe804b LS |
376 | static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol, |
377 | int no_context) | |
095f1fc4 LS |
378 | { |
379 | return 0; | |
380 | } | |
095f1fc4 | 381 | |
1da177e4 LT |
382 | #endif /* CONFIG_NUMA */ |
383 | #endif /* __KERNEL__ */ | |
384 | ||
385 | #endif |