4 #include <linux/mmzone.h>
5 #include <linux/stddef.h>
6 #include <linux/linkage.h>
7 #include <linux/topology.h>
8 #include <linux/mmdebug.h>
10 struct vm_area_struct
;
15 * Zone modifiers (see linux/mmzone.h - low three bits)
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.
21 #define __GFP_DMA ((__force gfp_t)0x01u)
22 #define __GFP_HIGHMEM ((__force gfp_t)0x02u)
23 #define __GFP_DMA32 ((__force gfp_t)0x04u)
26 * Action modifiers - doesn't change the zoning
28 * __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
29 * _might_ fail. This depends upon the particular VM implementation.
31 * __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
32 * cannot handle allocation failures.
34 * __GFP_NORETRY: The VM implementation must not retry indefinitely.
36 * __GFP_MOVABLE: Flag that this page will be movable by the page migration
37 * mechanism or reclaimed
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 */
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 */
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 */
51 #define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
52 #define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
53 #define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
54 #define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */
56 #define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */
57 #define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
59 /* This equals 0, but use constants in case they ever change */
60 #define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
61 /* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
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)
66 #define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
68 #define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
69 #define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
71 #define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
72 __GFP_HARDWALL | __GFP_HIGHMEM | \
76 #define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
78 #define GFP_THISNODE ((__force gfp_t)0)
81 /* This mask makes up all the page movable related flags */
82 #define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
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)
89 /* Control slab gfp mask during early boot */
90 #define SLAB_GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
92 /* Control allocation constraints */
93 #define GFP_CONSTRAINT_MASK (__GFP_HARDWALL|__GFP_THISNODE)
95 /* Do not use these with a slab allocator */
96 #define GFP_SLAB_BUG_MASK (__GFP_DMA32|__GFP_HIGHMEM|~__GFP_BITS_MASK)
98 /* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
99 platforms, used as appropriate on others */
101 #define GFP_DMA __GFP_DMA
103 /* 4GB DMA on some platforms */
104 #define GFP_DMA32 __GFP_DMA32
106 /* Convert GFP flags to their corresponding migrate type */
107 static inline int allocflags_to_migratetype(gfp_t gfp_flags
)
109 WARN_ON((gfp_flags
& GFP_MOVABLE_MASK
) == GFP_MOVABLE_MASK
);
111 if (unlikely(page_group_by_mobility_disabled
))
112 return MIGRATE_UNMOVABLE
;
114 /* Group based on mobility */
115 return (((gfp_flags
& __GFP_MOVABLE
) != 0) << 1) |
116 ((gfp_flags
& __GFP_RECLAIMABLE
) != 0);
119 static inline enum zone_type
gfp_zone(gfp_t flags
)
121 #ifdef CONFIG_ZONE_DMA
122 if (flags
& __GFP_DMA
)
125 #ifdef CONFIG_ZONE_DMA32
126 if (flags
& __GFP_DMA32
)
129 if ((flags
& (__GFP_HIGHMEM
| __GFP_MOVABLE
)) ==
130 (__GFP_HIGHMEM
| __GFP_MOVABLE
))
132 #ifdef CONFIG_HIGHMEM
133 if (flags
& __GFP_HIGHMEM
)
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).
146 static inline int gfp_zonelist(gfp_t flags
)
148 if (NUMA_BUILD
&& unlikely(flags
& __GFP_THISNODE
))
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.
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.
160 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
161 * optimized to &contig_page_data at compile-time.
163 static inline struct zonelist
*node_zonelist(int nid
, gfp_t flags
)
165 return NODE_DATA(nid
)->node_zonelists
+ gfp_zonelist(flags
);
168 #ifndef HAVE_ARCH_FREE_PAGE
169 static inline void arch_free_page(struct page
*page
, int order
) { }
171 #ifndef HAVE_ARCH_ALLOC_PAGE
172 static inline void arch_alloc_page(struct page
*page
, int order
) { }
176 __alloc_pages_nodemask(gfp_t gfp_mask
, unsigned int order
,
177 struct zonelist
*zonelist
, nodemask_t
*nodemask
);
179 static inline struct page
*
180 __alloc_pages(gfp_t gfp_mask
, unsigned int order
,
181 struct zonelist
*zonelist
)
183 return __alloc_pages_nodemask(gfp_mask
, order
, zonelist
, NULL
);
186 static inline struct page
*alloc_pages_node(int nid
, gfp_t gfp_mask
,
189 /* Unknown node is current node */
191 nid
= numa_node_id();
193 return __alloc_pages(gfp_mask
, order
, node_zonelist(nid
, gfp_mask
));
196 static inline struct page
*alloc_pages_exact_node(int nid
, gfp_t gfp_mask
,
199 VM_BUG_ON(nid
< 0 || nid
>= MAX_NUMNODES
);
201 return __alloc_pages(gfp_mask
, order
, node_zonelist(nid
, gfp_mask
));
205 extern struct page
*alloc_pages_current(gfp_t gfp_mask
, unsigned order
);
207 static inline struct page
*
208 alloc_pages(gfp_t gfp_mask
, unsigned int order
)
210 return alloc_pages_current(gfp_mask
, order
);
212 extern struct page
*alloc_page_vma(gfp_t gfp_mask
,
213 struct vm_area_struct
*vma
, unsigned long addr
);
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)
219 #define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
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
);
224 void *alloc_pages_exact(size_t size
, gfp_t gfp_mask
);
225 void free_pages_exact(void *virt
, size_t size
);
227 #define __get_free_page(gfp_mask) \
228 __get_free_pages((gfp_mask),0)
230 #define __get_dma_pages(gfp_mask, order) \
231 __get_free_pages((gfp_mask) | GFP_DMA,(order))
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
);
238 #define __free_page(page) __free_pages((page), 0)
239 #define free_page(addr) free_pages((addr),0)
241 void page_alloc_init(void);
242 void drain_zone_pages(struct zone
*zone
, struct per_cpu_pages
*pcp
);
243 void drain_all_pages(void);
244 void drain_local_pages(void *dummy
);
246 #endif /* __LINUX_GFP_H */