Remove "#ifdef __KERNEL__" checks from unexported headers
[linux-2.6/btrfs-unstable.git] / include / linux / mempolicy.h
blob3a39570b81b85e525bea4cde10429ac470546bbe
1 #ifndef _LINUX_MEMPOLICY_H
2 #define _LINUX_MEMPOLICY_H 1
4 #include <linux/errno.h>
6 /*
7 * NUMA memory policies for Linux.
8 * Copyright 2003,2004 Andi Kleen SuSE Labs
9 */
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.
17 /* Policies */
18 enum {
19 MPOL_DEFAULT,
20 MPOL_PREFERRED,
21 MPOL_BIND,
22 MPOL_INTERLEAVE,
23 MPOL_MAX, /* always last member of enum */
26 /* Flags for set_mempolicy */
27 #define MPOL_F_STATIC_NODES (1 << 15)
28 #define MPOL_F_RELATIVE_NODES (1 << 14)
31 * MPOL_MODE_FLAGS is the union of all possible optional mode flags passed to
32 * either set_mempolicy() or mbind().
34 #define MPOL_MODE_FLAGS (MPOL_F_STATIC_NODES | MPOL_F_RELATIVE_NODES)
36 /* Flags for get_mempolicy */
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 */
39 #define MPOL_F_MEMS_ALLOWED (1<<2) /* return allowed memories */
41 /* Flags for mbind */
42 #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */
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 */
48 * Internal flags that share the struct mempolicy flags word with
49 * "mode flags". These flags are allocated from bit 0 up, as they
50 * are never OR'ed into the mode in mempolicy API arguments.
52 #define MPOL_F_SHARED (1 << 0) /* identify shared policies */
53 #define MPOL_F_LOCAL (1 << 1) /* preferred local allocation */
55 #ifdef __KERNEL__
57 #include <linux/mmzone.h>
58 #include <linux/slab.h>
59 #include <linux/rbtree.h>
60 #include <linux/spinlock.h>
61 #include <linux/nodemask.h>
63 struct mm_struct;
65 #ifdef CONFIG_NUMA
68 * Describe a memory policy.
70 * A mempolicy can be either associated with a process or with a VMA.
71 * For VMA related allocations the VMA policy is preferred, otherwise
72 * the process policy is used. Interrupts ignore the memory policy
73 * of the current process.
75 * Locking policy for interlave:
76 * In process context there is no locking because only the process accesses
77 * its own state. All vma manipulation is somewhat protected by a down_read on
78 * mmap_sem.
80 * Freeing policy:
81 * Mempolicy objects are reference counted. A mempolicy will be freed when
82 * mpol_put() decrements the reference count to zero.
84 * Duplicating policy objects:
85 * mpol_dup() allocates a new mempolicy and copies the specified mempolicy
86 * to the new storage. The reference count of the new object is initialized
87 * to 1, representing the caller of mpol_dup().
89 struct mempolicy {
90 atomic_t refcnt;
91 unsigned short mode; /* See MPOL_* above */
92 unsigned short flags; /* See set_mempolicy() MPOL_F_* above */
93 union {
94 short preferred_node; /* preferred */
95 nodemask_t nodes; /* interleave/bind */
96 /* undefined for default */
97 } v;
98 union {
99 nodemask_t cpuset_mems_allowed; /* relative to these nodes */
100 nodemask_t user_nodemask; /* nodemask passed by user */
101 } w;
105 * Support for managing mempolicy data objects (clone, copy, destroy)
106 * The default fast path of a NULL MPOL_DEFAULT policy is always inlined.
109 extern void __mpol_put(struct mempolicy *pol);
110 static inline void mpol_put(struct mempolicy *pol)
112 if (pol)
113 __mpol_put(pol);
117 * Does mempolicy pol need explicit unref after use?
118 * Currently only needed for shared policies.
120 static inline int mpol_needs_cond_ref(struct mempolicy *pol)
122 return (pol && (pol->flags & MPOL_F_SHARED));
125 static inline void mpol_cond_put(struct mempolicy *pol)
127 if (mpol_needs_cond_ref(pol))
128 __mpol_put(pol);
131 extern struct mempolicy *__mpol_cond_copy(struct mempolicy *tompol,
132 struct mempolicy *frompol);
133 static inline struct mempolicy *mpol_cond_copy(struct mempolicy *tompol,
134 struct mempolicy *frompol)
136 if (!frompol)
137 return frompol;
138 return __mpol_cond_copy(tompol, frompol);
141 extern struct mempolicy *__mpol_dup(struct mempolicy *pol);
142 static inline struct mempolicy *mpol_dup(struct mempolicy *pol)
144 if (pol)
145 pol = __mpol_dup(pol);
146 return pol;
149 #define vma_policy(vma) ((vma)->vm_policy)
150 #define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol))
152 static inline void mpol_get(struct mempolicy *pol)
154 if (pol)
155 atomic_inc(&pol->refcnt);
158 extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b);
159 static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b)
161 if (a == b)
162 return 1;
163 return __mpol_equal(a, b);
167 * Tree of shared policies for a shared memory region.
168 * Maintain the policies in a pseudo mm that contains vmas. The vmas
169 * carry the policy. As a special twist the pseudo mm is indexed in pages, not
170 * bytes, so that we can work with shared memory segments bigger than
171 * unsigned long.
174 struct sp_node {
175 struct rb_node nd;
176 unsigned long start, end;
177 struct mempolicy *policy;
180 struct shared_policy {
181 struct rb_root root;
182 spinlock_t lock;
185 void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
186 int mpol_set_shared_policy(struct shared_policy *info,
187 struct vm_area_struct *vma,
188 struct mempolicy *new);
189 void mpol_free_shared_policy(struct shared_policy *p);
190 struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
191 unsigned long idx);
193 extern void numa_default_policy(void);
194 extern void numa_policy_init(void);
195 extern void mpol_rebind_task(struct task_struct *tsk,
196 const nodemask_t *new);
197 extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
198 extern void mpol_fix_fork_child_flag(struct task_struct *p);
200 extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
201 unsigned long addr, gfp_t gfp_flags,
202 struct mempolicy **mpol, nodemask_t **nodemask);
203 extern unsigned slab_node(struct mempolicy *policy);
205 extern enum zone_type policy_zone;
207 static inline void check_highest_zone(enum zone_type k)
209 if (k > policy_zone && k != ZONE_MOVABLE)
210 policy_zone = k;
213 int do_migrate_pages(struct mm_struct *mm,
214 const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags);
217 #ifdef CONFIG_TMPFS
218 extern int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context);
220 extern int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol,
221 int no_context);
222 #endif
223 #else
225 struct mempolicy {};
227 static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b)
229 return 1;
232 static inline void mpol_put(struct mempolicy *p)
236 static inline void mpol_cond_put(struct mempolicy *pol)
240 static inline struct mempolicy *mpol_cond_copy(struct mempolicy *to,
241 struct mempolicy *from)
243 return from;
246 static inline void mpol_get(struct mempolicy *pol)
250 static inline struct mempolicy *mpol_dup(struct mempolicy *old)
252 return NULL;
255 struct shared_policy {};
257 static inline int mpol_set_shared_policy(struct shared_policy *info,
258 struct vm_area_struct *vma,
259 struct mempolicy *new)
261 return -EINVAL;
264 static inline void mpol_shared_policy_init(struct shared_policy *sp,
265 struct mempolicy *mpol)
269 static inline void mpol_free_shared_policy(struct shared_policy *p)
273 static inline struct mempolicy *
274 mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
276 return NULL;
279 #define vma_policy(vma) NULL
280 #define vma_set_policy(vma, pol) do {} while(0)
282 static inline void numa_policy_init(void)
286 static inline void numa_default_policy(void)
290 static inline void mpol_rebind_task(struct task_struct *tsk,
291 const nodemask_t *new)
295 static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
299 static inline void mpol_fix_fork_child_flag(struct task_struct *p)
303 static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
304 unsigned long addr, gfp_t gfp_flags,
305 struct mempolicy **mpol, nodemask_t **nodemask)
307 *mpol = NULL;
308 *nodemask = NULL;
309 return node_zonelist(0, gfp_flags);
312 static inline int do_migrate_pages(struct mm_struct *mm,
313 const nodemask_t *from_nodes,
314 const nodemask_t *to_nodes, int flags)
316 return 0;
319 static inline void check_highest_zone(int k)
323 #ifdef CONFIG_TMPFS
324 static inline int mpol_parse_str(char *str, struct mempolicy **mpol,
325 int no_context)
327 return 1; /* error */
330 static inline int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol,
331 int no_context)
333 return 0;
335 #endif
337 #endif /* CONFIG_NUMA */
338 #endif /* __KERNEL__ */
340 #endif