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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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
11/* Policies */
12#define MPOL_DEFAULT 0
13#define MPOL_PREFERRED 1
14#define MPOL_BIND 2
15#define MPOL_INTERLEAVE 3
16
17#define MPOL_MAX MPOL_INTERLEAVE
18
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 */
22
23/* Flags for mbind */
24#define MPOL_MF_STRICT (1<<0) /* Verify existing pages in the mapping */
Christoph Lameterdc9aa5b2006-01-08 01:00:50 -080025#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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#ifdef __KERNEL__
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/mmzone.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/slab.h>
33#include <linux/rbtree.h>
34#include <linux/spinlock.h>
Andi Kleendfcd3c02005-10-29 18:15:48 -070035#include <linux/nodemask.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
37struct vm_area_struct;
Ralf Baechle45b35a52006-06-08 00:43:41 -070038struct mm_struct;
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#ifdef CONFIG_NUMA
41
42/*
43 * Describe a memory policy.
44 *
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.
49 *
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
Hugh Dickinsb8072f02005-10-29 18:16:41 -070053 * mmap_sem.
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 *
55 * Freeing policy:
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.
58 *
59 * Copying policy objects:
60 * For MPOL_BIND the zonelist must be always duplicated. mpol_clone() does this.
61 */
62struct mempolicy {
63 atomic_t refcnt;
64 short policy; /* See MPOL_* above */
65 union {
66 struct zonelist *zonelist; /* bind */
67 short preferred_node; /* preferred */
Andi Kleendfcd3c02005-10-29 18:15:48 -070068 nodemask_t nodes; /* interleave */
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 /* undefined for default */
70 } v;
Paul Jackson74cb2152006-01-08 01:01:56 -080071 nodemask_t cpuset_mems_allowed; /* mempolicy relative to these nodes */
Linus Torvalds1da177e2005-04-16 15:20:36 -070072};
73
74/*
75 * Support for managing mempolicy data objects (clone, copy, destroy)
76 * The default fast path of a NULL MPOL_DEFAULT policy is always inlined.
77 */
78
79extern void __mpol_free(struct mempolicy *pol);
80static inline void mpol_free(struct mempolicy *pol)
81{
82 if (pol)
83 __mpol_free(pol);
84}
85
86extern struct mempolicy *__mpol_copy(struct mempolicy *pol);
87static inline struct mempolicy *mpol_copy(struct mempolicy *pol)
88{
89 if (pol)
90 pol = __mpol_copy(pol);
91 return pol;
92}
93
94#define vma_policy(vma) ((vma)->vm_policy)
95#define vma_set_policy(vma, pol) ((vma)->vm_policy = (pol))
96
97static inline void mpol_get(struct mempolicy *pol)
98{
99 if (pol)
100 atomic_inc(&pol->refcnt);
101}
102
103extern int __mpol_equal(struct mempolicy *a, struct mempolicy *b);
104static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b)
105{
106 if (a == b)
107 return 1;
108 return __mpol_equal(a, b);
109}
110#define vma_mpol_equal(a,b) mpol_equal(vma_policy(a), vma_policy(b))
111
112/* Could later add inheritance of the process policy here. */
113
114#define mpol_set_vma_default(vma) ((vma)->vm_policy = NULL)
115
116/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 * 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
121 * unsigned long.
122 */
123
124struct sp_node {
125 struct rb_node nd;
126 unsigned long start, end;
127 struct mempolicy *policy;
128};
129
130struct shared_policy {
131 struct rb_root root;
132 spinlock_t lock;
133};
134
Robin Holt7339ff82006-01-14 13:20:48 -0800135void mpol_shared_policy_init(struct shared_policy *info, int policy,
136 nodemask_t *nodes);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137int mpol_set_shared_policy(struct shared_policy *info,
138 struct vm_area_struct *vma,
139 struct mempolicy *new);
140void mpol_free_shared_policy(struct shared_policy *p);
141struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
142 unsigned long idx);
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144extern void numa_default_policy(void);
145extern void numa_policy_init(void);
Paul Jackson74cb2152006-01-08 01:01:56 -0800146extern void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *new);
147extern void mpol_rebind_task(struct task_struct *tsk,
148 const nodemask_t *new);
Paul Jackson42253992006-01-08 01:01:59 -0800149extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
Paul Jacksonc61afb12006-03-24 03:16:08 -0800150extern void mpol_fix_fork_child_flag(struct task_struct *p);
Paul Jackson42253992006-01-08 01:01:59 -0800151#define set_cpuset_being_rebound(x) (cpuset_being_rebound = (x))
152
Paul Jacksonfaf6bbc2006-10-21 10:24:17 -0700153#ifdef CONFIG_CPUSETS
Paul Jackson42253992006-01-08 01:01:59 -0800154#define current_cpuset_is_being_rebound() \
155 (cpuset_being_rebound == current->cpuset)
156#else
157#define current_cpuset_is_being_rebound() 0
158#endif
159
Andi Kleend42c6992005-07-06 19:56:03 +0200160extern struct mempolicy default_policy;
Christoph Lameter5da7ca82006-01-06 00:10:46 -0800161extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
162 unsigned long addr);
Christoph Lameterdc85da12006-01-18 17:42:36 -0800163extern unsigned slab_node(struct mempolicy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
Christoph Lameter2f6726e2006-09-25 23:31:18 -0700165extern enum zone_type policy_zone;
Christoph Lameter4be38e32006-01-06 00:11:17 -0800166
Christoph Lameter2f6726e2006-09-25 23:31:18 -0700167static inline void check_highest_zone(enum zone_type k)
Christoph Lameter4be38e32006-01-06 00:11:17 -0800168{
169 if (k > policy_zone)
170 policy_zone = k;
171}
172
Christoph Lameter39743882006-01-08 01:00:51 -0800173int do_migrate_pages(struct mm_struct *mm,
174 const nodemask_t *from_nodes, const nodemask_t *to_nodes, int flags);
175
Paul Jackson42253992006-01-08 01:01:59 -0800176extern void *cpuset_being_rebound; /* Trigger mpol_copy vma rebind */
177
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178#else
179
180struct mempolicy {};
181
182static inline int mpol_equal(struct mempolicy *a, struct mempolicy *b)
183{
184 return 1;
185}
186#define vma_mpol_equal(a,b) 1
187
188#define mpol_set_vma_default(vma) do {} while(0)
189
190static inline void mpol_free(struct mempolicy *p)
191{
192}
193
194static inline void mpol_get(struct mempolicy *pol)
195{
196}
197
198static inline struct mempolicy *mpol_copy(struct mempolicy *old)
199{
200 return NULL;
201}
202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203struct shared_policy {};
204
205static inline int mpol_set_shared_policy(struct shared_policy *info,
206 struct vm_area_struct *vma,
207 struct mempolicy *new)
208{
209 return -EINVAL;
210}
211
Robin Holt7339ff82006-01-14 13:20:48 -0800212static inline void mpol_shared_policy_init(struct shared_policy *info,
213 int policy, nodemask_t *nodes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
215}
216
217static inline void mpol_free_shared_policy(struct shared_policy *p)
218{
219}
220
221static inline struct mempolicy *
222mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx)
223{
224 return NULL;
225}
226
227#define vma_policy(vma) NULL
228#define vma_set_policy(vma, pol) do {} while(0)
229
230static inline void numa_policy_init(void)
231{
232}
233
234static inline void numa_default_policy(void)
235{
236}
237
Paul Jackson74cb2152006-01-08 01:01:56 -0800238static inline void mpol_rebind_policy(struct mempolicy *pol,
239 const nodemask_t *new)
240{
241}
242
243static inline void mpol_rebind_task(struct task_struct *tsk,
Paul Jackson68860ec2005-10-30 15:02:36 -0800244 const nodemask_t *new)
245{
246}
247
Paul Jackson42253992006-01-08 01:01:59 -0800248static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
249{
250}
251
Paul Jacksonc61afb12006-03-24 03:16:08 -0800252static inline void mpol_fix_fork_child_flag(struct task_struct *p)
253{
254}
255
Paul Jackson42253992006-01-08 01:01:59 -0800256#define set_cpuset_being_rebound(x) do {} while (0)
257
Christoph Lameter5da7ca82006-01-06 00:10:46 -0800258static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
259 unsigned long addr)
260{
261 return NODE_DATA(0)->node_zonelists + gfp_zone(GFP_HIGHUSER);
262}
263
Paul Jackson45b07ef2006-01-08 01:00:56 -0800264static inline int do_migrate_pages(struct mm_struct *mm,
265 const nodemask_t *from_nodes,
266 const nodemask_t *to_nodes, int flags)
267{
268 return 0;
269}
270
Christoph Lameter4be38e32006-01-06 00:11:17 -0800271static inline void check_highest_zone(int k)
272{
273}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274#endif /* CONFIG_NUMA */
275#endif /* __KERNEL__ */
276
277#endif