2 * NUMA memory policies for Linux.
3 * Copyright 2003,2004 Andi Kleen SuSE Labs
5 #ifndef _LINUX_MEMPOLICY_H
6 #define _LINUX_MEMPOLICY_H 1
9 #include <linux/mmzone.h>
10 #include <linux/slab.h>
11 #include <linux/rbtree.h>
12 #include <linux/spinlock.h>
13 #include <linux/nodemask.h>
14 #include <linux/pagemap.h>
15 #include <uapi/linux/mempolicy.h>
22 * Describe a memory policy.
24 * A mempolicy can be either associated with a process or with a VMA.
25 * For VMA related allocations the VMA policy is preferred, otherwise
26 * the process policy is used. Interrupts ignore the memory policy
27 * of the current process.
29 * Locking policy for interlave:
30 * In process context there is no locking because only the process accesses
31 * its own state. All vma manipulation is somewhat protected by a down_read on
35 * Mempolicy objects are reference counted. A mempolicy will be freed when
36 * mpol_put() decrements the reference count to zero.
38 * Duplicating policy objects:
39 * mpol_dup() allocates a new mempolicy and copies the specified mempolicy
40 * to the new storage. The reference count of the new object is initialized
41 * to 1, representing the caller of mpol_dup().
45 unsigned short mode
; /* See MPOL_* above */
46 unsigned short flags
; /* See set_mempolicy() MPOL_F_* above */
48 short preferred_node
; /* preferred */
49 nodemask_t nodes
; /* interleave/bind */
50 /* undefined for default */
53 nodemask_t cpuset_mems_allowed
; /* relative to these nodes */
54 nodemask_t user_nodemask
; /* nodemask passed by user */
59 * Support for managing mempolicy data objects (clone, copy, destroy)
60 * The default fast path of a NULL MPOL_DEFAULT policy is always inlined.
63 extern void __mpol_put(struct mempolicy
*pol
);
64 static inline void mpol_put(struct mempolicy
*pol
)
71 * Does mempolicy pol need explicit unref after use?
72 * Currently only needed for shared policies.
74 static inline int mpol_needs_cond_ref(struct mempolicy
*pol
)
76 return (pol
&& (pol
->flags
& MPOL_F_SHARED
));
79 static inline void mpol_cond_put(struct mempolicy
*pol
)
81 if (mpol_needs_cond_ref(pol
))
85 extern struct mempolicy
*__mpol_dup(struct mempolicy
*pol
);
86 static inline struct mempolicy
*mpol_dup(struct mempolicy
*pol
)
89 pol
= __mpol_dup(pol
);
93 #define vma_policy(vma) ((vma)->vm_policy)
95 static inline void mpol_get(struct mempolicy
*pol
)
98 atomic_inc(&pol
->refcnt
);
101 extern bool __mpol_equal(struct mempolicy
*a
, struct mempolicy
*b
);
102 static inline bool mpol_equal(struct mempolicy
*a
, struct mempolicy
*b
)
106 return __mpol_equal(a
, b
);
110 * Tree of shared policies for a shared memory region.
111 * Maintain the policies in a pseudo mm that contains vmas. The vmas
112 * carry the policy. As a special twist the pseudo mm is indexed in pages, not
113 * bytes, so that we can work with shared memory segments bigger than
119 unsigned long start
, end
;
120 struct mempolicy
*policy
;
123 struct shared_policy
{
128 int vma_dup_policy(struct vm_area_struct
*src
, struct vm_area_struct
*dst
);
129 void mpol_shared_policy_init(struct shared_policy
*sp
, struct mempolicy
*mpol
);
130 int mpol_set_shared_policy(struct shared_policy
*info
,
131 struct vm_area_struct
*vma
,
132 struct mempolicy
*new);
133 void mpol_free_shared_policy(struct shared_policy
*p
);
134 struct mempolicy
*mpol_shared_policy_lookup(struct shared_policy
*sp
,
137 struct mempolicy
*get_task_policy(struct task_struct
*p
);
138 struct mempolicy
*__get_vma_policy(struct vm_area_struct
*vma
,
140 bool vma_policy_mof(struct vm_area_struct
*vma
);
142 extern void numa_default_policy(void);
143 extern void numa_policy_init(void);
144 extern void mpol_rebind_task(struct task_struct
*tsk
, const nodemask_t
*new,
145 enum mpol_rebind_step step
);
146 extern void mpol_rebind_mm(struct mm_struct
*mm
, nodemask_t
*new);
148 extern struct zonelist
*huge_zonelist(struct vm_area_struct
*vma
,
149 unsigned long addr
, gfp_t gfp_flags
,
150 struct mempolicy
**mpol
, nodemask_t
**nodemask
);
151 extern bool init_nodemask_of_mempolicy(nodemask_t
*mask
);
152 extern bool mempolicy_nodemask_intersects(struct task_struct
*tsk
,
153 const nodemask_t
*mask
);
154 extern unsigned int mempolicy_slab_node(void);
156 extern enum zone_type policy_zone
;
158 static inline void check_highest_zone(enum zone_type k
)
160 if (k
> policy_zone
&& k
!= ZONE_MOVABLE
)
164 int do_migrate_pages(struct mm_struct
*mm
, const nodemask_t
*from
,
165 const nodemask_t
*to
, int flags
);
169 extern int mpol_parse_str(char *str
, struct mempolicy
**mpol
);
172 extern void mpol_to_str(char *buffer
, int maxlen
, struct mempolicy
*pol
);
174 /* Check if a vma is migratable */
175 static inline bool vma_migratable(struct vm_area_struct
*vma
)
177 if (vma
->vm_flags
& (VM_IO
| VM_PFNMAP
))
180 #ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
181 if (vma
->vm_flags
& VM_HUGETLB
)
186 * Migration allocates pages in the highest zone. If we cannot
187 * do so then migration (at least from node to node) is not
191 gfp_zone(mapping_gfp_mask(vma
->vm_file
->f_mapping
))
197 extern int mpol_misplaced(struct page
*, struct vm_area_struct
*, unsigned long);
203 static inline bool mpol_equal(struct mempolicy
*a
, struct mempolicy
*b
)
208 static inline void mpol_put(struct mempolicy
*p
)
212 static inline void mpol_cond_put(struct mempolicy
*pol
)
216 static inline void mpol_get(struct mempolicy
*pol
)
220 struct shared_policy
{};
222 static inline void mpol_shared_policy_init(struct shared_policy
*sp
,
223 struct mempolicy
*mpol
)
227 static inline void mpol_free_shared_policy(struct shared_policy
*p
)
231 static inline struct mempolicy
*
232 mpol_shared_policy_lookup(struct shared_policy
*sp
, unsigned long idx
)
237 #define vma_policy(vma) NULL
240 vma_dup_policy(struct vm_area_struct
*src
, struct vm_area_struct
*dst
)
245 static inline void numa_policy_init(void)
249 static inline void numa_default_policy(void)
253 static inline void mpol_rebind_task(struct task_struct
*tsk
,
254 const nodemask_t
*new,
255 enum mpol_rebind_step step
)
259 static inline void mpol_rebind_mm(struct mm_struct
*mm
, nodemask_t
*new)
263 static inline struct zonelist
*huge_zonelist(struct vm_area_struct
*vma
,
264 unsigned long addr
, gfp_t gfp_flags
,
265 struct mempolicy
**mpol
, nodemask_t
**nodemask
)
269 return node_zonelist(0, gfp_flags
);
272 static inline bool init_nodemask_of_mempolicy(nodemask_t
*m
)
277 static inline int do_migrate_pages(struct mm_struct
*mm
, const nodemask_t
*from
,
278 const nodemask_t
*to
, int flags
)
283 static inline void check_highest_zone(int k
)
288 static inline int mpol_parse_str(char *str
, struct mempolicy
**mpol
)
290 return 1; /* error */
294 static inline int mpol_misplaced(struct page
*page
, struct vm_area_struct
*vma
,
295 unsigned long address
)
297 return -1; /* no node preference */
300 #endif /* CONFIG_NUMA */