]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef __LINUX_GFP_H |
2 | #define __LINUX_GFP_H | |
3 | ||
4 | #include <linux/mmzone.h> | |
5 | #include <linux/stddef.h> | |
6 | #include <linux/linkage.h> | |
082edb7b | 7 | #include <linux/topology.h> |
6484eb3e | 8 | #include <linux/mmdebug.h> |
1da177e4 LT |
9 | |
10 | struct vm_area_struct; | |
11 | ||
12 | /* | |
13 | * GFP bitmasks.. | |
e53ef38d CL |
14 | * |
15 | * Zone modifiers (see linux/mmzone.h - low three bits) | |
16 | * | |
e53ef38d CL |
17 | * Do not put any conditional on these. If necessary modify the definitions |
18 | * without the underscores and use the consistently. The definitions here may | |
19 | * be used in bit comparisons. | |
1da177e4 | 20 | */ |
af4ca457 AV |
21 | #define __GFP_DMA ((__force gfp_t)0x01u) |
22 | #define __GFP_HIGHMEM ((__force gfp_t)0x02u) | |
e53ef38d | 23 | #define __GFP_DMA32 ((__force gfp_t)0x04u) |
1da177e4 LT |
24 | |
25 | /* | |
26 | * Action modifiers - doesn't change the zoning | |
27 | * | |
28 | * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt | |
29 | * _might_ fail. This depends upon the particular VM implementation. | |
30 | * | |
31 | * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller | |
32 | * cannot handle allocation failures. | |
33 | * | |
34 | * __GFP_NORETRY: The VM implementation must not retry indefinitely. | |
769848c0 MG |
35 | * |
36 | * __GFP_MOVABLE: Flag that this page will be movable by the page migration | |
37 | * mechanism or reclaimed | |
1da177e4 | 38 | */ |
af4ca457 AV |
39 | #define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */ |
40 | #define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */ | |
41 | #define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */ | |
42 | #define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */ | |
43 | #define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */ | |
44 | #define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */ | |
ab857d09 NA |
45 | #define __GFP_REPEAT ((__force gfp_t)0x400u) /* See above */ |
46 | #define __GFP_NOFAIL ((__force gfp_t)0x800u) /* See above */ | |
47 | #define __GFP_NORETRY ((__force gfp_t)0x1000u)/* See above */ | |
af4ca457 AV |
48 | #define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */ |
49 | #define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */ | |
50 | #define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */ | |
2d6c666e | 51 | #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */ |
9b819d20 | 52 | #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */ |
e12ba74d MG |
53 | #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */ |
54 | #define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */ | |
1da177e4 | 55 | |
e12ba74d | 56 | #define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */ |
af4ca457 | 57 | #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1)) |
1da177e4 | 58 | |
7b04d717 JD |
59 | /* This equals 0, but use constants in case they ever change */ |
60 | #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH) | |
4eac915d | 61 | /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */ |
1da177e4 LT |
62 | #define GFP_ATOMIC (__GFP_HIGH) |
63 | #define GFP_NOIO (__GFP_WAIT) | |
64 | #define GFP_NOFS (__GFP_WAIT | __GFP_IO) | |
65 | #define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS) | |
e12ba74d MG |
66 | #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
67 | __GFP_RECLAIMABLE) | |
f90b1d2f PJ |
68 | #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL) |
69 | #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \ | |
70 | __GFP_HIGHMEM) | |
769848c0 MG |
71 | #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \ |
72 | __GFP_HARDWALL | __GFP_HIGHMEM | \ | |
73 | __GFP_MOVABLE) | |
1da177e4 | 74 | |
77f700da | 75 | #ifdef CONFIG_NUMA |
980128f2 | 76 | #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY) |
77f700da | 77 | #else |
f2e97df6 | 78 | #define GFP_THISNODE ((__force gfp_t)0) |
77f700da CL |
79 | #endif |
80 | ||
6cb06229 | 81 | /* This mask makes up all the page movable related flags */ |
e12ba74d | 82 | #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE) |
6cb06229 CL |
83 | |
84 | /* Control page allocator reclaim behavior */ | |
85 | #define GFP_RECLAIM_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS|\ | |
86 | __GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\ | |
87 | __GFP_NORETRY|__GFP_NOMEMALLOC) | |
88 | ||
7e85ee0c PE |
89 | /* Control slab gfp mask during early boot */ |
90 | #define SLAB_GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS) | |
91 | ||
6cb06229 CL |
92 | /* Control allocation constraints */ |
93 | #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE) | |
94 | ||
95 | /* Do not use these with a slab allocator */ | |
96 | #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK) | |
980128f2 | 97 | |
1da177e4 LT |
98 | /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some |
99 | platforms, used as appropriate on others */ | |
100 | ||
101 | #define GFP_DMA __GFP_DMA | |
102 | ||
a2f1b424 AK |
103 | /* 4GB DMA on some platforms */ |
104 | #define GFP_DMA32 __GFP_DMA32 | |
105 | ||
467c996c MG |
106 | /* Convert GFP flags to their corresponding migrate type */ |
107 | static inline int allocflags_to_migratetype(gfp_t gfp_flags) | |
108 | { | |
109 | WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK); | |
110 | ||
111 | if (unlikely(page_group_by_mobility_disabled)) | |
112 | return MIGRATE_UNMOVABLE; | |
113 | ||
114 | /* Group based on mobility */ | |
115 | return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) | | |
116 | ((gfp_flags & __GFP_RECLAIMABLE) != 0); | |
117 | } | |
a2f1b424 | 118 | |
19655d34 | 119 | static inline enum zone_type gfp_zone(gfp_t flags) |
4e4785bc | 120 | { |
4b51d669 | 121 | #ifdef CONFIG_ZONE_DMA |
4e4785bc | 122 | if (flags & __GFP_DMA) |
8cece85e | 123 | return ZONE_DMA; |
4b51d669 | 124 | #endif |
4e4785bc CL |
125 | #ifdef CONFIG_ZONE_DMA32 |
126 | if (flags & __GFP_DMA32) | |
8cece85e | 127 | return ZONE_DMA32; |
4e4785bc | 128 | #endif |
2a1e274a MG |
129 | if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) == |
130 | (__GFP_HIGHMEM | __GFP_MOVABLE)) | |
8cece85e | 131 | return ZONE_MOVABLE; |
4e4785bc CL |
132 | #ifdef CONFIG_HIGHMEM |
133 | if (flags & __GFP_HIGHMEM) | |
8cece85e | 134 | return ZONE_HIGHMEM; |
4e4785bc | 135 | #endif |
8cece85e | 136 | return ZONE_NORMAL; |
4e4785bc CL |
137 | } |
138 | ||
1da177e4 LT |
139 | /* |
140 | * There is only one page-allocator function, and two main namespaces to | |
141 | * it. The alloc_page*() variants return 'struct page *' and as such | |
142 | * can allocate highmem pages, the *get*page*() variants return | |
143 | * virtual kernel addresses to the allocated page(s). | |
144 | */ | |
145 | ||
54a6eb5c MG |
146 | static inline int gfp_zonelist(gfp_t flags) |
147 | { | |
148 | if (NUMA_BUILD && unlikely(flags & __GFP_THISNODE)) | |
149 | return 1; | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
1da177e4 LT |
154 | /* |
155 | * We get the zone list from the current node and the gfp_mask. | |
156 | * This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones. | |
54a6eb5c MG |
157 | * There are two zonelists per node, one for all zones with memory and |
158 | * one containing just zones from the node the zonelist belongs to. | |
1da177e4 LT |
159 | * |
160 | * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets | |
161 | * optimized to &contig_page_data at compile-time. | |
162 | */ | |
0e88460d MG |
163 | static inline struct zonelist *node_zonelist(int nid, gfp_t flags) |
164 | { | |
54a6eb5c | 165 | return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags); |
0e88460d | 166 | } |
1da177e4 LT |
167 | |
168 | #ifndef HAVE_ARCH_FREE_PAGE | |
169 | static inline void arch_free_page(struct page *page, int order) { } | |
170 | #endif | |
cc102509 NP |
171 | #ifndef HAVE_ARCH_ALLOC_PAGE |
172 | static inline void arch_alloc_page(struct page *page, int order) { } | |
173 | #endif | |
1da177e4 | 174 | |
e4048e5d | 175 | struct page * |
d239171e | 176 | __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, |
e4048e5d KM |
177 | struct zonelist *zonelist, nodemask_t *nodemask); |
178 | ||
179 | static inline struct page * | |
180 | __alloc_pages(gfp_t gfp_mask, unsigned int order, | |
181 | struct zonelist *zonelist) | |
182 | { | |
d239171e | 183 | return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL); |
e4048e5d KM |
184 | } |
185 | ||
dd0fc66f | 186 | static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask, |
1da177e4 LT |
187 | unsigned int order) |
188 | { | |
819a6928 AK |
189 | /* Unknown node is current node */ |
190 | if (nid < 0) | |
191 | nid = numa_node_id(); | |
192 | ||
0e88460d | 193 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); |
1da177e4 LT |
194 | } |
195 | ||
6484eb3e MG |
196 | static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask, |
197 | unsigned int order) | |
198 | { | |
199 | VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES); | |
200 | ||
201 | return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask)); | |
202 | } | |
203 | ||
1da177e4 | 204 | #ifdef CONFIG_NUMA |
dd0fc66f | 205 | extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order); |
1da177e4 LT |
206 | |
207 | static inline struct page * | |
dd0fc66f | 208 | alloc_pages(gfp_t gfp_mask, unsigned int order) |
1da177e4 | 209 | { |
1da177e4 LT |
210 | return alloc_pages_current(gfp_mask, order); |
211 | } | |
dd0fc66f | 212 | extern struct page *alloc_page_vma(gfp_t gfp_mask, |
1da177e4 LT |
213 | struct vm_area_struct *vma, unsigned long addr); |
214 | #else | |
215 | #define alloc_pages(gfp_mask, order) \ | |
216 | alloc_pages_node(numa_node_id(), gfp_mask, order) | |
217 | #define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0) | |
218 | #endif | |
219 | #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0) | |
220 | ||
b3c97528 HH |
221 | extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order); |
222 | extern unsigned long get_zeroed_page(gfp_t gfp_mask); | |
1da177e4 | 223 | |
2be0ffe2 TT |
224 | void *alloc_pages_exact(size_t size, gfp_t gfp_mask); |
225 | void free_pages_exact(void *virt, size_t size); | |
226 | ||
1da177e4 LT |
227 | #define __get_free_page(gfp_mask) \ |
228 | __get_free_pages((gfp_mask),0) | |
229 | ||
230 | #define __get_dma_pages(gfp_mask, order) \ | |
231 | __get_free_pages((gfp_mask) | GFP_DMA,(order)) | |
232 | ||
b3c97528 HH |
233 | extern void __free_pages(struct page *page, unsigned int order); |
234 | extern void free_pages(unsigned long addr, unsigned int order); | |
235 | extern void free_hot_page(struct page *page); | |
236 | extern void free_cold_page(struct page *page); | |
1da177e4 LT |
237 | |
238 | #define __free_page(page) __free_pages((page), 0) | |
239 | #define free_page(addr) free_pages((addr),0) | |
240 | ||
241 | void page_alloc_init(void); | |
4037d452 | 242 | void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp); |
9f8f2172 CL |
243 | void drain_all_pages(void); |
244 | void drain_local_pages(void *dummy); | |
1da177e4 | 245 | |
7f33d49a RW |
246 | extern bool oom_killer_disabled; |
247 | ||
248 | static inline void oom_killer_disable(void) | |
249 | { | |
250 | oom_killer_disabled = true; | |
251 | } | |
252 | ||
253 | static inline void oom_killer_enable(void) | |
254 | { | |
255 | oom_killer_disabled = false; | |
256 | } | |
257 | ||
1da177e4 | 258 | #endif /* __LINUX_GFP_H */ |