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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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>
Rusty Russell082edb72009-03-13 23:43:37 +10307#include <linux/topology.h>
Mel Gorman6484eb32009-06-16 15:31:54 -07008#include <linux/mmdebug.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10struct vm_area_struct;
11
12/*
13 * GFP bitmasks..
Christoph Lametere53ef382006-09-25 23:31:14 -070014 *
15 * Zone modifiers (see linux/mmzone.h - low three bits)
16 *
Christoph Lametere53ef382006-09-25 23:31:14 -070017 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 */
Al Viroaf4ca452005-10-21 02:55:38 -040021#define __GFP_DMA ((__force gfp_t)0x01u)
22#define __GFP_HIGHMEM ((__force gfp_t)0x02u)
Christoph Lametere53ef382006-09-25 23:31:14 -070023#define __GFP_DMA32 ((__force gfp_t)0x04u)
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
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.
Mel Gorman769848c2007-07-17 04:03:05 -070035 *
36 * __GFP_MOVABLE: Flag that this page will be movable by the page migration
37 * mechanism or reclaimed
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 */
Al Viroaf4ca452005-10-21 02:55:38 -040039#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 */
Nishanth Aravamudanab857d02008-04-29 00:58:23 -070045#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 */
Al Viroaf4ca452005-10-21 02:55:38 -040048#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 */
Paul Jackson2d6c6662005-11-13 16:06:44 -080051#define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
Christoph Lameter9b819d22006-09-25 23:31:40 -070052#define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
Mel Gormane12ba742007-10-16 01:25:52 -070053#define __GFP_RECLAIMABLE ((__force gfp_t)0x80000u) /* Page is reclaimable */
54#define __GFP_MOVABLE ((__force gfp_t)0x100000u) /* Page is movable */
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Mel Gormane12ba742007-10-16 01:25:52 -070056#define __GFP_BITS_SHIFT 21 /* Room for 21 __GFP_FOO bits */
Al Viroaf4ca452005-10-21 02:55:38 -040057#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Jeff Dike7b04d712006-04-10 22:53:27 -070059/* This equals 0, but use constants in case they ever change */
60#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
Paul Jackson4eac9152006-01-11 12:17:19 -080061/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#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)
Mel Gormane12ba742007-10-16 01:25:52 -070066#define GFP_TEMPORARY (__GFP_WAIT | __GFP_IO | __GFP_FS | \
67 __GFP_RECLAIMABLE)
Paul Jacksonf90b1d22005-09-06 15:18:10 -070068#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)
Mel Gorman769848c2007-07-17 04:03:05 -070071#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
72 __GFP_HARDWALL | __GFP_HIGHMEM | \
73 __GFP_MOVABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Christoph Lameter77f700d2006-09-27 01:50:07 -070075#ifdef CONFIG_NUMA
Christoph Lameter980128f2006-09-25 23:31:46 -070076#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
Christoph Lameter77f700d2006-09-27 01:50:07 -070077#else
Al Virof2e97df2007-02-09 16:38:55 +000078#define GFP_THISNODE ((__force gfp_t)0)
Christoph Lameter77f700d2006-09-27 01:50:07 -070079#endif
80
Christoph Lameter6cb06222007-10-16 01:25:41 -070081/* This mask makes up all the page movable related flags */
Mel Gormane12ba742007-10-16 01:25:52 -070082#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
Christoph Lameter6cb06222007-10-16 01:25:41 -070083
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
Pekka Enberg7e85ee02009-06-12 14:03:06 +030089/* Control slab gfp mask during early boot */
90#define SLAB_GFP_BOOT_MASK __GFP_BITS_MASK & ~(__GFP_WAIT|__GFP_IO|__GFP_FS)
91
Christoph Lameter6cb06222007-10-16 01:25:41 -070092/* 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)
Christoph Lameter980128f2006-09-25 23:31:46 -070097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098/* 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
Andi Kleena2f1b422005-11-05 17:25:53 +0100103/* 4GB DMA on some platforms */
104#define GFP_DMA32 __GFP_DMA32
105
Mel Gorman467c9962007-10-16 01:26:02 -0700106/* Convert GFP flags to their corresponding migrate type */
107static 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}
Andi Kleena2f1b422005-11-05 17:25:53 +0100118
Christoph Lameter19655d32006-09-25 23:31:19 -0700119static inline enum zone_type gfp_zone(gfp_t flags)
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700120{
Christoph Lameter4b51d662007-02-10 01:43:10 -0800121#ifdef CONFIG_ZONE_DMA
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700122 if (flags & __GFP_DMA)
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700123 return ZONE_DMA;
Christoph Lameter4b51d662007-02-10 01:43:10 -0800124#endif
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700125#ifdef CONFIG_ZONE_DMA32
126 if (flags & __GFP_DMA32)
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700127 return ZONE_DMA32;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700128#endif
Mel Gorman2a1e2742007-07-17 04:03:12 -0700129 if ((flags & (__GFP_HIGHMEM | __GFP_MOVABLE)) ==
130 (__GFP_HIGHMEM | __GFP_MOVABLE))
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700131 return ZONE_MOVABLE;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700132#ifdef CONFIG_HIGHMEM
133 if (flags & __GFP_HIGHMEM)
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700134 return ZONE_HIGHMEM;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700135#endif
KAMEZAWA Hiroyuki8cece852008-04-28 02:13:36 -0700136 return ZONE_NORMAL;
Christoph Lameter4e4785b2006-09-25 23:31:17 -0700137}
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139/*
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
Mel Gorman54a6eb52008-04-28 02:12:16 -0700146static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154/*
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.
Mel Gorman54a6eb52008-04-28 02:12:16 -0700157 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 *
160 * For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
161 * optimized to &contig_page_data at compile-time.
162 */
Mel Gorman0e884602008-04-28 02:12:14 -0700163static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
164{
Mel Gorman54a6eb52008-04-28 02:12:16 -0700165 return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
Mel Gorman0e884602008-04-28 02:12:14 -0700166}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
168#ifndef HAVE_ARCH_FREE_PAGE
169static inline void arch_free_page(struct page *page, int order) { }
170#endif
Nick Piggincc102502006-12-06 20:32:00 -0800171#ifndef HAVE_ARCH_ALLOC_PAGE
172static inline void arch_alloc_page(struct page *page, int order) { }
173#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
KOSAKI Motohiroe4048e52008-07-23 21:27:01 -0700175struct page *
Mel Gormand2391712009-06-16 15:31:52 -0700176__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
KOSAKI Motohiroe4048e52008-07-23 21:27:01 -0700177 struct zonelist *zonelist, nodemask_t *nodemask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
KOSAKI Motohiroe4048e52008-07-23 21:27:01 -0700179static inline struct page *
180__alloc_pages(gfp_t gfp_mask, unsigned int order,
181 struct zonelist *zonelist)
182{
Mel Gormand2391712009-06-16 15:31:52 -0700183 return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
KOSAKI Motohiroe4048e52008-07-23 21:27:01 -0700184}
185
Al Virodd0fc662005-10-07 07:46:04 +0100186static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 unsigned int order)
188{
Andi Kleen819a6922006-01-11 22:43:45 +0100189 /* Unknown node is current node */
190 if (nid < 0)
191 nid = numa_node_id();
192
Mel Gorman0e884602008-04-28 02:12:14 -0700193 return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
Mel Gorman6484eb32009-06-16 15:31:54 -0700196static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204#ifdef CONFIG_NUMA
Al Virodd0fc662005-10-07 07:46:04 +0100205extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207static inline struct page *
Al Virodd0fc662005-10-07 07:46:04 +0100208alloc_pages(gfp_t gfp_mask, unsigned int order)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return alloc_pages_current(gfp_mask, order);
211}
Al Virodd0fc662005-10-07 07:46:04 +0100212extern struct page *alloc_page_vma(gfp_t gfp_mask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 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
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800221extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
222extern unsigned long get_zeroed_page(gfp_t gfp_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
Timur Tabi2be0ffe2008-07-23 21:28:11 -0700224void *alloc_pages_exact(size_t size, gfp_t gfp_mask);
225void free_pages_exact(void *virt, size_t size);
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227#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
Harvey Harrisonb3c97522008-02-13 15:03:15 -0800233extern void __free_pages(struct page *page, unsigned int order);
234extern void free_pages(unsigned long addr, unsigned int order);
235extern void free_hot_page(struct page *page);
236extern void free_cold_page(struct page *page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238#define __free_page(page) __free_pages((page), 0)
239#define free_page(addr) free_pages((addr),0)
240
241void page_alloc_init(void);
Christoph Lameter4037d452007-05-09 02:35:14 -0700242void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
Christoph Lameter9f8f2172008-02-04 22:29:11 -0800243void drain_all_pages(void);
244void drain_local_pages(void *dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245
Rafael J. Wysocki7f33d492009-06-16 15:32:41 -0700246extern bool oom_killer_disabled;
247
248static inline void oom_killer_disable(void)
249{
250 oom_killer_disabled = true;
251}
252
253static inline void oom_killer_enable(void)
254{
255 oom_killer_disabled = false;
256}
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258#endif /* __LINUX_GFP_H */