]>
Commit | Line | Data |
---|---|---|
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 | |
028fec41 | 26 | /* Flags for set_mempolicy */ |
f5b087b5 | 27 | #define MPOL_F_STATIC_NODES (1 << 15) |
4c50bc01 | 28 | #define MPOL_F_RELATIVE_NODES (1 << 14) |
f5b087b5 | 29 | |
028fec41 DR |
30 | /* |
31 | * MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to | |
32 | * either set_mempolicy() or mbind(). | |
33 | */ | |
4c50bc01 | 34 | #define MPOL_MODE_FLAGS (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES) |
028fec41 DR |
35 | |
36 | /* Flags for get_mempolicy */ | |
1da177e4 LT |
37 | #define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */ |
38 | #define MPOL_F_ADDR (1<<1) /* look up vma using address */ | |
754af6f5 | 39 | #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */ |
1da177e4 LT |
40 | |
41 | /* Flags for mbind */ | |
42 | #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */ | |
dc9aa5b9 CL |
43 | #define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform to mapping */ |
44 | #define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to mapping */ | |
45 | #define MPOL_MF_INTERNAL (1<<3) /* Internal flags start here */ | |
1da177e4 LT |
46 | |
47 | #ifdef __KERNEL__ | |
48 | ||
1da177e4 | 49 | #include <linux/mmzone.h> |
1da177e4 LT |
50 | #include <linux/slab.h> |
51 | #include <linux/rbtree.h> | |
52 | #include <linux/spinlock.h> | |
dfcd3c0d | 53 | #include <linux/nodemask.h> |
1da177e4 | 54 | |
45b35a5c | 55 | struct mm_struct; |
1da177e4 LT |
56 | |
57 | #ifdef CONFIG_NUMA | |
58 | ||
59 | /* | |
60 | * Describe a memory policy. | |
61 | * | |
62 | * A mempolicy can be either associated with a process or with a VMA. | |
63 | * For VMA related allocations the VMA policy is preferred, otherwise | |
64 | * the process policy is used. Interrupts ignore the memory policy | |
65 | * of the current process. | |
66 | * | |
67 | * Locking policy for interlave: | |
68 | * In process context there is no locking because only the process accesses | |
69 | * its own state. All vma manipulation is somewhat protected by a down_read on | |
b8072f09 | 70 | * mmap_sem. |
1da177e4 LT |
71 | * |
72 | * Freeing policy: | |
19770b32 | 73 | * Mempolicy objects are reference counted. A mempolicy will be freed when |
f0be3d32 | 74 | * mpol_put() decrements the reference count to zero. |
1da177e4 LT |
75 | * |
76 | * Copying policy objects: | |
19770b32 MG |
77 | * mpol_copy() allocates a new mempolicy and copies the specified mempolicy |
78 | * to the new storage. The reference count of the new object is initialized | |
79 | * to 1, representing the caller of mpol_copy(). | |
1da177e4 LT |
80 | */ |
81 | struct mempolicy { | |
82 | atomic_t refcnt; | |
a3b51e01 | 83 | unsigned short policy; /* See MPOL_* above */ |
028fec41 | 84 | unsigned short flags; /* See set_mempolicy() MPOL_F_* above */ |
1da177e4 | 85 | union { |
1da177e4 | 86 | short preferred_node; /* preferred */ |
19770b32 | 87 | nodemask_t nodes; /* interleave/bind */ |
1da177e4 LT |
88 | /* undefined for default */ |
89 | } v; | |
f5b087b5 DR |
90 | union { |
91 | nodemask_t cpuset_mems_allowed; /* relative to these nodes */ | |
92 | nodemask_t user_nodemask; /* nodemask passed by user */ | |
93 | } w; | |
1da177e4 LT |
94 | }; |
95 | ||
96 | /* | |
97 | * Support for managing mempolicy data objects (clone, copy, destroy) | |
98 | * The default fast path of a NULL MPOL_DEFAULT policy is always inlined. | |
99 | */ | |
100 | ||
f0be3d32 LS |
101 | extern void __mpol_put(struct mempolicy *pol); |
102 | static inline void mpol_put(struct mempolicy *pol) | |
1da177e4 LT |
103 | { |
104 | if (pol) | |
f0be3d32 | 105 | __mpol_put(pol); |
1da177e4 LT |
106 | } |
107 | ||
108 | extern struct mempolicy *__mpol_copy(struct mempolicy *pol); | |
109 | static inline struct mempolicy *mpol_copy(struct mempolicy *pol) | |
110 | { | |
111 | if (pol) | |
112 | pol = __mpol_copy(pol); | |
113 | return pol; | |
114 | } | |
115 | ||
116 | #define vma_policy(vma) ((vma)->vm_policy) | |
117 | #define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol)) | |
118 | ||
119 | static inline void mpol_get(struct mempolicy *pol) | |
120 | { | |
121 | if (pol) | |
122 | atomic_inc(&pol->refcnt); | |
123 | } | |
124 | ||
125 | extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b); | |
126 | static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
127 | { | |
128 | if (a == b) | |
129 | return 1; | |
130 | return __mpol_equal(a, b); | |
131 | } | |
1da177e4 | 132 | |
1da177e4 LT |
133 | /* |
134 | * Tree of shared policies for a shared memory region. | |
135 | * Maintain the policies in a pseudo mm that contains vmas. The vmas | |
136 | * carry the policy. As a special twist the pseudo mm is indexed in pages, not | |
137 | * bytes, so that we can work with shared memory segments bigger than | |
138 | * unsigned long. | |
139 | */ | |
140 | ||
141 | struct sp_node { | |
142 | struct rb_node nd; | |
143 | unsigned long start, end; | |
144 | struct mempolicy *policy; | |
145 | }; | |
146 | ||
147 | struct shared_policy { | |
148 | struct rb_root root; | |
149 | spinlock_t lock; | |
150 | }; | |
151 | ||
a3b51e01 | 152 | void mpol_shared_policy_init(struct shared_policy *info, unsigned short policy, |
028fec41 | 153 | unsigned short flags, nodemask_t *nodes); |
1da177e4 LT |
154 | int mpol_set_shared_policy(struct shared_policy *info, |
155 | struct vm_area_struct *vma, | |
156 | struct mempolicy *new); | |
157 | void mpol_free_shared_policy(struct shared_policy *p); | |
158 | struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, | |
159 | unsigned long idx); | |
160 | ||
161 | extern void numa_default_policy(void); | |
162 | extern void numa_policy_init(void); | |
74cb2155 PJ |
163 | extern void mpol_rebind_task(struct task_struct *tsk, |
164 | const nodemask_t *new); | |
4225399a | 165 | extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new); |
c61afb18 | 166 | extern void mpol_fix_fork_child_flag(struct task_struct *p); |
4225399a | 167 | |
5da7ca86 | 168 | extern struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
19770b32 MG |
169 | unsigned long addr, gfp_t gfp_flags, |
170 | struct mempolicy **mpol, nodemask_t **nodemask); | |
dc85da15 | 171 | extern unsigned slab_node(struct mempolicy *policy); |
1da177e4 | 172 | |
2f6726e5 | 173 | extern enum zone_type policy_zone; |
4be38e35 | 174 | |
2f6726e5 | 175 | static inline void check_highest_zone(enum zone_type k) |
4be38e35 | 176 | { |
b377fd39 | 177 | if (k > policy_zone && k != ZONE_MOVABLE) |
4be38e35 CL |
178 | policy_zone = k; |
179 | } | |
180 | ||
39743889 CL |
181 | int do_migrate_pages(struct mm_struct *mm, |
182 | const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags); | |
183 | ||
1da177e4 LT |
184 | #else |
185 | ||
186 | struct mempolicy {}; | |
187 | ||
188 | static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b) | |
189 | { | |
190 | return 1; | |
191 | } | |
1da177e4 | 192 | |
f0be3d32 | 193 | static inline void mpol_put(struct mempolicy *p) |
1da177e4 LT |
194 | { |
195 | } | |
196 | ||
197 | static inline void mpol_get(struct mempolicy *pol) | |
198 | { | |
199 | } | |
200 | ||
201 | static inline struct mempolicy *mpol_copy(struct mempolicy *old) | |
202 | { | |
203 | return NULL; | |
204 | } | |
205 | ||
1da177e4 LT |
206 | struct shared_policy {}; |
207 | ||
208 | static inline int mpol_set_shared_policy(struct shared_policy *info, | |
209 | struct vm_area_struct *vma, | |
210 | struct mempolicy *new) | |
211 | { | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
7339ff83 | 215 | static inline void mpol_shared_policy_init(struct shared_policy *info, |
028fec41 | 216 | unsigned short policy, unsigned short flags, nodemask_t *nodes) |
1da177e4 LT |
217 | { |
218 | } | |
219 | ||
220 | static inline void mpol_free_shared_policy(struct shared_policy *p) | |
221 | { | |
222 | } | |
223 | ||
224 | static inline struct mempolicy * | |
225 | mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) | |
226 | { | |
227 | return NULL; | |
228 | } | |
229 | ||
230 | #define vma_policy(vma) NULL | |
231 | #define vma_set_policy(vma, pol) do {} while(0) | |
232 | ||
233 | static inline void numa_policy_init(void) | |
234 | { | |
235 | } | |
236 | ||
237 | static inline void numa_default_policy(void) | |
238 | { | |
239 | } | |
240 | ||
74cb2155 | 241 | static inline void mpol_rebind_task(struct task_struct *tsk, |
68860ec1 PJ |
242 | const nodemask_t *new) |
243 | { | |
244 | } | |
245 | ||
4225399a PJ |
246 | static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) |
247 | { | |
248 | } | |
249 | ||
c61afb18 PJ |
250 | static inline void mpol_fix_fork_child_flag(struct task_struct *p) |
251 | { | |
252 | } | |
253 | ||
5da7ca86 | 254 | static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma, |
19770b32 MG |
255 | unsigned long addr, gfp_t gfp_flags, |
256 | struct mempolicy **mpol, nodemask_t **nodemask) | |
5da7ca86 | 257 | { |
19770b32 MG |
258 | *mpol = NULL; |
259 | *nodemask = NULL; | |
0e88460d | 260 | return node_zonelist(0, gfp_flags); |
5da7ca86 CL |
261 | } |
262 | ||
45b07ef3 PJ |
263 | static inline int do_migrate_pages(struct mm_struct *mm, |
264 | const nodemask_t *from_nodes, | |
265 | const nodemask_t *to_nodes, int flags) | |
266 | { | |
267 | return 0; | |
268 | } | |
269 | ||
4be38e35 CL |
270 | static inline void check_highest_zone(int k) |
271 | { | |
272 | } | |
1da177e4 LT |
273 | #endif /* CONFIG_NUMA */ |
274 | #endif /* __KERNEL__ */ | |
275 | ||
276 | #endif |