1 #ifndef _LINUX_MEMPOLICY_H
2 #define _LINUX_MEMPOLICY_H 1
4 #include <linux/errno.h>
7 * NUMA memory policies for Linux.
8 * Copyright 2003,2004 Andi Kleen SuSE Labs
12 #define MPOL_DEFAULT 0
13 #define MPOL_PREFERRED 1
15 #define MPOL_INTERLEAVE 3
17 #define MPOL_MAX MPOL_INTERLEAVE
19 /* Flags for get_mem_policy */
20 #define MPOL_F_NODE (1<<0) /* return next IL mode instead of node mask */
21 #define MPOL_F_ADDR (1<<1) /* look up vma using address */
24 #define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */
25 #define MPOL_MF_MOVE (1<<1) /* Move pages owned by this process to conform to mapping */
26 #define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to mapping */
27 #define MPOL_MF_INTERNAL (1<<3) /* Internal flags start here */
31 #include <linux/config.h>
32 #include <linux/mmzone.h>
33 #include <linux/slab.h>
34 #include <linux/rbtree.h>
35 #include <linux/spinlock.h>
36 #include <linux/nodemask.h>
38 struct vm_area_struct;
43 * Describe a memory policy.
45 * A mempolicy can be either associated with a process or with a VMA.
46 * For VMA related allocations the VMA policy is preferred, otherwise
47 * the process policy is used. Interrupts ignore the memory policy
48 * of the current process.
50 * Locking policy for interlave:
51 * In process context there is no locking because only the process accesses
52 * its own state. All vma manipulation is somewhat protected by a down_read on
56 * When policy is MPOL_BIND v.zonelist is kmalloc'ed and must be kfree'd.
57 * All other policies don't have any external state. mpol_free() handles this.
59 * Copying policy objects:
60 * For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this.
64 short policy; /* See MPOL_* above */
66 struct zonelist *zonelist; /* bind */
67 short preferred_node; /* preferred */
68 nodemask_t nodes; /* interleave */
69 /* undefined for default */
71 nodemask_t cpuset_mems_allowed; /* mempolicy relative to these nodes */
75 * Support for managing mempolicy data objects (clone, copy, destroy)
76 * The default fast path of a NULL MPOL_DEFAULT policy is always inlined.
79 extern void __mpol_free(struct mempolicy *pol);
80 static inline void mpol_free(struct mempolicy *pol)
86 extern struct mempolicy *__mpol_copy(struct mempolicy *pol);
87 static inline struct mempolicy *mpol_copy(struct mempolicy *pol)
90 pol = __mpol_copy(pol);
94 #define vma_policy(vma) ((vma)->vm_policy)
95 #define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol))
97 static inline void mpol_get(struct mempolicy *pol)
100 atomic_inc(&pol->refcnt);
103 extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b);
104 static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b)
108 return __mpol_equal(a, b);
110 #define vma_mpol_equal(a,b) mpol_equal(vma_policy(a), vma_policy(b))
112 /* Could later add inheritance of the process policy here. */
114 #define mpol_set_vma_default(vma) ((vma)->vm_policy = NULL)
117 * Tree of shared policies for a shared memory region.
118 * Maintain the policies in a pseudo mm that contains vmas. The vmas
119 * carry the policy. As a special twist the pseudo mm is indexed in pages, not
120 * bytes, so that we can work with shared memory segments bigger than
126 unsigned long start, end;
127 struct mempolicy *policy;
130 struct shared_policy {
135 static inline void mpol_shared_policy_init(struct shared_policy *info)
137 info->root = RB_ROOT;
138 spin_lock_init(&info->lock);
141 int mpol_set_shared_policy(struct shared_policy *info,
142 struct vm_area_struct *vma,
143 struct mempolicy *new);
144 void mpol_free_shared_policy(struct shared_policy *p);
145 struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
148 extern void numa_default_policy(void);
149 extern void numa_policy_init(void);
150 extern void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *new);
151 extern void mpol_rebind_task(struct task_struct *tsk,
152 const nodemask_t *new);
153 extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
154 #define set_cpuset_being_rebound(x) (cpuset_being_rebound = (x))
157 #define current_cpuset_is_being_rebound() \
158 (cpuset_being_rebound == current->cpuset)
160 #define current_cpuset_is_being_rebound() 0
163 extern struct mempolicy default_policy;
164 extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
167 extern int policy_zone;
169 static inline void check_highest_zone(int k)
175 int do_migrate_pages(struct mm_struct *mm,
176 const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags);
178 extern void *cpuset_being_rebound; /* Trigger mpol_copy vma rebind */
184 static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b)
188 #define vma_mpol_equal(a,b) 1
190 #define mpol_set_vma_default(vma) do {} while(0)
192 static inline void mpol_free(struct mempolicy *p)
196 static inline void mpol_get(struct mempolicy *pol)
200 static inline struct mempolicy *mpol_copy(struct mempolicy *old)
205 struct shared_policy {};
207 static inline int mpol_set_shared_policy(struct shared_policy *info,
208 struct vm_area_struct *vma,
209 struct mempolicy *new)
214 static inline void mpol_shared_policy_init(struct shared_policy *info)
218 static inline void mpol_free_shared_policy(struct shared_policy *p)
222 static inline struct mempolicy *
223 mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
228 #define vma_policy(vma) NULL
229 #define vma_set_policy(vma, pol) do {} while(0)
231 static inline void numa_policy_init(void)
235 static inline void numa_default_policy(void)
239 static inline void mpol_rebind_policy(struct mempolicy *pol,
240 const nodemask_t *new)
244 static inline void mpol_rebind_task(struct task_struct *tsk,
245 const nodemask_t *new)
249 static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
253 #define set_cpuset_being_rebound(x) do {} while (0)
255 static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
258 return NODE_DATA(0)->node_zonelists + gfp_zone(GFP_HIGHUSER);
261 static inline int do_migrate_pages(struct mm_struct *mm,
262 const nodemask_t *from_nodes,
263 const nodemask_t *to_nodes, int flags)
268 static inline void check_highest_zone(int k)
271 #endif /* CONFIG_NUMA */
272 #endif /* __KERNEL__ */