1 /* SPDX-License-Identifier: GPL-2.0 */
3 * NUMA memory policies for Linux.
4 * Copyright 2003,2004 Andi Kleen SuSE Labs
6 #ifndef _LINUX_MEMPOLICY_H
7 #define _LINUX_MEMPOLICY_H 1
9 #include <linux/sched.h>
10 #include <linux/mmzone.h>
11 #include <linux/slab.h>
12 #include <linux/rbtree.h>
13 #include <linux/spinlock.h>
14 #include <linux/nodemask.h>
15 #include <linux/pagemap.h>
16 #include <uapi/linux/mempolicy.h>
23 * Describe a memory policy.
25 * A mempolicy can be either associated with a process or with a VMA.
26 * For VMA related allocations the VMA policy is preferred, otherwise
27 * the process policy is used. Interrupts ignore the memory policy
28 * of the current process.
30 * Locking policy for interleave:
31 * In process context there is no locking because only the process accesses
32 * its own state. All vma manipulation is somewhat protected by a down_read on
36 * Mempolicy objects are reference counted. A mempolicy will be freed when
37 * mpol_put() decrements the reference count to zero.
39 * Duplicating policy objects:
40 * mpol_dup() allocates a new mempolicy and copies the specified mempolicy
41 * to the new storage. The reference count of the new object is initialized
42 * to 1, representing the caller of mpol_dup().
46 unsigned short mode; /* See MPOL_* above */
47 unsigned short flags; /* See set_mempolicy() MPOL_F_* above */
48 nodemask_t nodes; /* interleave/bind/perfer */
49 int home_node; /* Home node to use for MPOL_BIND and MPOL_PREFERRED_MANY */
52 nodemask_t cpuset_mems_allowed; /* relative to these nodes */
53 nodemask_t user_nodemask; /* nodemask passed by user */
58 * Support for managing mempolicy data objects (clone, copy, destroy)
59 * The default fast path of a NULL MPOL_DEFAULT policy is always inlined.
62 extern void __mpol_put(struct mempolicy *pol);
63 static inline void mpol_put(struct mempolicy *pol)
70 * Does mempolicy pol need explicit unref after use?
71 * Currently only needed for shared policies.
73 static inline int mpol_needs_cond_ref(struct mempolicy *pol)
75 return (pol && (pol->flags & MPOL_F_SHARED));
78 static inline void mpol_cond_put(struct mempolicy *pol)
80 if (mpol_needs_cond_ref(pol))
84 extern struct mempolicy *__mpol_dup(struct mempolicy *pol);
85 static inline struct mempolicy *mpol_dup(struct mempolicy *pol)
88 pol = __mpol_dup(pol);
92 #define vma_policy(vma) ((vma)->vm_policy)
94 static inline void mpol_get(struct mempolicy *pol)
97 atomic_inc(&pol->refcnt);
100 extern bool __mpol_equal(struct mempolicy *a, struct mempolicy *b);
101 static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
105 return __mpol_equal(a, b);
109 * Tree of shared policies for a shared memory region.
110 * Maintain the policies in a pseudo mm that contains vmas. The vmas
111 * carry the policy. As a special twist the pseudo mm is indexed in pages, not
112 * bytes, so that we can work with shared memory segments bigger than
118 unsigned long start, end;
119 struct mempolicy *policy;
122 struct shared_policy {
127 int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst);
128 void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol);
129 int mpol_set_shared_policy(struct shared_policy *info,
130 struct vm_area_struct *vma,
131 struct mempolicy *new);
132 void mpol_free_shared_policy(struct shared_policy *p);
133 struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
136 struct mempolicy *get_task_policy(struct task_struct *p);
137 struct mempolicy *__get_vma_policy(struct vm_area_struct *vma,
139 bool vma_policy_mof(struct vm_area_struct *vma);
141 extern void numa_default_policy(void);
142 extern void numa_policy_init(void);
143 extern void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new);
144 extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
146 extern int huge_node(struct vm_area_struct *vma,
147 unsigned long addr, gfp_t gfp_flags,
148 struct mempolicy **mpol, nodemask_t **nodemask);
149 extern bool init_nodemask_of_mempolicy(nodemask_t *mask);
150 extern bool mempolicy_in_oom_domain(struct task_struct *tsk,
151 const nodemask_t *mask);
152 extern nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy);
154 static inline nodemask_t *policy_nodemask_current(gfp_t gfp)
156 struct mempolicy *mpol = get_task_policy(current);
158 return policy_nodemask(gfp, mpol);
161 extern unsigned int mempolicy_slab_node(void);
163 extern enum zone_type policy_zone;
165 static inline void check_highest_zone(enum zone_type k)
167 if (k > policy_zone && k != ZONE_MOVABLE)
171 int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
172 const nodemask_t *to, int flags);
176 extern int mpol_parse_str(char *str, struct mempolicy **mpol);
179 extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
181 /* Check if a vma is migratable */
182 extern bool vma_migratable(struct vm_area_struct *vma);
184 extern int mpol_misplaced(struct page *, struct vm_area_struct *, unsigned long);
185 extern void mpol_put_task_policy(struct task_struct *);
187 static inline bool mpol_is_preferred_many(struct mempolicy *pol)
189 return (pol->mode == MPOL_PREFERRED_MANY);
197 static inline bool mpol_equal(struct mempolicy *a, struct mempolicy *b)
202 static inline void mpol_put(struct mempolicy *p)
206 static inline void mpol_cond_put(struct mempolicy *pol)
210 static inline void mpol_get(struct mempolicy *pol)
214 struct shared_policy {};
216 static inline void mpol_shared_policy_init(struct shared_policy *sp,
217 struct mempolicy *mpol)
221 static inline void mpol_free_shared_policy(struct shared_policy *p)
225 static inline struct mempolicy *
226 mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
231 #define vma_policy(vma) NULL
234 vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst)
239 static inline void numa_policy_init(void)
243 static inline void numa_default_policy(void)
247 static inline void mpol_rebind_task(struct task_struct *tsk,
248 const nodemask_t *new)
252 static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
256 static inline int huge_node(struct vm_area_struct *vma,
257 unsigned long addr, gfp_t gfp_flags,
258 struct mempolicy **mpol, nodemask_t **nodemask)
265 static inline bool init_nodemask_of_mempolicy(nodemask_t *m)
270 static inline int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from,
271 const nodemask_t *to, int flags)
276 static inline void check_highest_zone(int k)
281 static inline int mpol_parse_str(char *str, struct mempolicy **mpol)
283 return 1; /* error */
287 static inline int mpol_misplaced(struct page *page, struct vm_area_struct *vma,
288 unsigned long address)
290 return -1; /* no node preference */
293 static inline void mpol_put_task_policy(struct task_struct *task)
297 static inline nodemask_t *policy_nodemask_current(gfp_t gfp)
302 static inline bool mpol_is_preferred_many(struct mempolicy *pol)
307 #endif /* CONFIG_NUMA */