forked from luck/tmp_suning_uos_patched
769848c038
It is often known at allocation time whether a page may be migrated or not. This patch adds a flag called __GFP_MOVABLE and a new mask called GFP_HIGH_MOVABLE. Allocations using the __GFP_MOVABLE can be either migrated using the page migration mechanism or reclaimed by syncing with backing storage and discarding. An API function very similar to alloc_zeroed_user_highpage() is added for __GFP_MOVABLE allocations called alloc_zeroed_user_highpage_movable(). The flags used by alloc_zeroed_user_highpage() are not changed because it would change the semantics of an existing API. After this patch is applied there are no in-kernel users of alloc_zeroed_user_highpage() so it probably should be marked deprecated if this patch is merged. Note that this patch includes a minor cleanup to the use of __GFP_ZERO in shmem.c to keep all flag modifications to inode->mapping in the shmem_dir_alloc() helper function. This clean-up suggestion is courtesy of Hugh Dickens. Additional credit goes to Christoph Lameter and Linus Torvalds for shaping the concept. Credit to Hugh Dickens for catching issues with shmem swap vector and ramfs allocations. [akpm@linux-foundation.org: build fix] [hugh@veritas.com: __GFP_ZERO cleanup] Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
196 lines
6.7 KiB
C
196 lines
6.7 KiB
C
#ifndef __LINUX_GFP_H
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#define __LINUX_GFP_H
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#include <linux/mmzone.h>
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#include <linux/stddef.h>
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#include <linux/linkage.h>
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struct vm_area_struct;
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/*
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* GFP bitmasks..
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*
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* Zone modifiers (see linux/mmzone.h - low three bits)
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*
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* Do not put any conditional on these. If necessary modify the definitions
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* without the underscores and use the consistently. The definitions here may
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* be used in bit comparisons.
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*/
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#define __GFP_DMA ((__force gfp_t)0x01u)
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#define __GFP_HIGHMEM ((__force gfp_t)0x02u)
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#define __GFP_DMA32 ((__force gfp_t)0x04u)
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/*
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* Action modifiers - doesn't change the zoning
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*
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* __GFP_REPEAT: Try hard to allocate the memory, but the allocation attempt
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* _might_ fail. This depends upon the particular VM implementation.
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*
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* __GFP_NOFAIL: The VM implementation _must_ retry infinitely: the caller
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* cannot handle allocation failures.
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*
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* __GFP_NORETRY: The VM implementation must not retry indefinitely.
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*
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* __GFP_MOVABLE: Flag that this page will be movable by the page migration
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* mechanism or reclaimed
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*/
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#define __GFP_WAIT ((__force gfp_t)0x10u) /* Can wait and reschedule? */
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#define __GFP_HIGH ((__force gfp_t)0x20u) /* Should access emergency pools? */
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#define __GFP_IO ((__force gfp_t)0x40u) /* Can start physical IO? */
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#define __GFP_FS ((__force gfp_t)0x80u) /* Can call down to low-level FS? */
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#define __GFP_COLD ((__force gfp_t)0x100u) /* Cache-cold page required */
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#define __GFP_NOWARN ((__force gfp_t)0x200u) /* Suppress page allocation failure warning */
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#define __GFP_REPEAT ((__force gfp_t)0x400u) /* Retry the allocation. Might fail */
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#define __GFP_NOFAIL ((__force gfp_t)0x800u) /* Retry for ever. Cannot fail */
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#define __GFP_NORETRY ((__force gfp_t)0x1000u)/* Do not retry. Might fail */
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#define __GFP_COMP ((__force gfp_t)0x4000u)/* Add compound page metadata */
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#define __GFP_ZERO ((__force gfp_t)0x8000u)/* Return zeroed page on success */
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#define __GFP_NOMEMALLOC ((__force gfp_t)0x10000u) /* Don't use emergency reserves */
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#define __GFP_HARDWALL ((__force gfp_t)0x20000u) /* Enforce hardwall cpuset memory allocs */
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#define __GFP_THISNODE ((__force gfp_t)0x40000u)/* No fallback, no policies */
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#define __GFP_MOVABLE ((__force gfp_t)0x80000u) /* Page is movable */
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#define __GFP_BITS_SHIFT 20 /* Room for 20 __GFP_FOO bits */
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#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
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/* if you forget to add the bitmask here kernel will crash, period */
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#define GFP_LEVEL_MASK (__GFP_WAIT|__GFP_HIGH|__GFP_IO|__GFP_FS| \
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__GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
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__GFP_NOFAIL|__GFP_NORETRY|__GFP_COMP| \
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__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_THISNODE| \
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__GFP_MOVABLE)
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/* This equals 0, but use constants in case they ever change */
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#define GFP_NOWAIT (GFP_ATOMIC & ~__GFP_HIGH)
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/* GFP_ATOMIC means both !wait (__GFP_WAIT not set) and use emergency pool */
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#define GFP_ATOMIC (__GFP_HIGH)
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#define GFP_NOIO (__GFP_WAIT)
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#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
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#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
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#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
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#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
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__GFP_HIGHMEM)
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#define GFP_HIGHUSER_MOVABLE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
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__GFP_HARDWALL | __GFP_HIGHMEM | \
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__GFP_MOVABLE)
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#define GFP_NOFS_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_MOVABLE)
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#define GFP_USER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
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__GFP_HARDWALL | __GFP_MOVABLE)
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#define GFP_HIGHUSER_PAGECACHE (__GFP_WAIT | __GFP_IO | __GFP_FS | \
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__GFP_HARDWALL | __GFP_HIGHMEM | \
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__GFP_MOVABLE)
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#ifdef CONFIG_NUMA
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#define GFP_THISNODE (__GFP_THISNODE | __GFP_NOWARN | __GFP_NORETRY)
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#else
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#define GFP_THISNODE ((__force gfp_t)0)
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#endif
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/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
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platforms, used as appropriate on others */
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#define GFP_DMA __GFP_DMA
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/* 4GB DMA on some platforms */
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#define GFP_DMA32 __GFP_DMA32
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static inline enum zone_type gfp_zone(gfp_t flags)
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{
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#ifdef CONFIG_ZONE_DMA
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if (flags & __GFP_DMA)
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return ZONE_DMA;
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#endif
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#ifdef CONFIG_ZONE_DMA32
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if (flags & __GFP_DMA32)
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return ZONE_DMA32;
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#endif
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#ifdef CONFIG_HIGHMEM
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if (flags & __GFP_HIGHMEM)
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return ZONE_HIGHMEM;
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#endif
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return ZONE_NORMAL;
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}
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/*
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* There is only one page-allocator function, and two main namespaces to
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* it. The alloc_page*() variants return 'struct page *' and as such
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* can allocate highmem pages, the *get*page*() variants return
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* virtual kernel addresses to the allocated page(s).
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*/
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/*
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* We get the zone list from the current node and the gfp_mask.
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* This zone list contains a maximum of MAXNODES*MAX_NR_ZONES zones.
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*
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* For the normal case of non-DISCONTIGMEM systems the NODE_DATA() gets
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* optimized to &contig_page_data at compile-time.
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*/
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#ifndef HAVE_ARCH_FREE_PAGE
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static inline void arch_free_page(struct page *page, int order) { }
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#endif
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#ifndef HAVE_ARCH_ALLOC_PAGE
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static inline void arch_alloc_page(struct page *page, int order) { }
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#endif
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extern struct page *
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FASTCALL(__alloc_pages(gfp_t, unsigned int, struct zonelist *));
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static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
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unsigned int order)
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{
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if (unlikely(order >= MAX_ORDER))
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return NULL;
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/* Unknown node is current node */
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if (nid < 0)
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nid = numa_node_id();
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return __alloc_pages(gfp_mask, order,
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NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
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}
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#ifdef CONFIG_NUMA
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extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);
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static inline struct page *
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alloc_pages(gfp_t gfp_mask, unsigned int order)
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{
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if (unlikely(order >= MAX_ORDER))
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return NULL;
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return alloc_pages_current(gfp_mask, order);
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}
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extern struct page *alloc_page_vma(gfp_t gfp_mask,
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struct vm_area_struct *vma, unsigned long addr);
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#else
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#define alloc_pages(gfp_mask, order) \
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alloc_pages_node(numa_node_id(), gfp_mask, order)
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#define alloc_page_vma(gfp_mask, vma, addr) alloc_pages(gfp_mask, 0)
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#endif
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#define alloc_page(gfp_mask) alloc_pages(gfp_mask, 0)
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extern unsigned long FASTCALL(__get_free_pages(gfp_t gfp_mask, unsigned int order));
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extern unsigned long FASTCALL(get_zeroed_page(gfp_t gfp_mask));
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#define __get_free_page(gfp_mask) \
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__get_free_pages((gfp_mask),0)
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#define __get_dma_pages(gfp_mask, order) \
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__get_free_pages((gfp_mask) | GFP_DMA,(order))
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extern void FASTCALL(__free_pages(struct page *page, unsigned int order));
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extern void FASTCALL(free_pages(unsigned long addr, unsigned int order));
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extern void FASTCALL(free_hot_page(struct page *page));
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extern void FASTCALL(free_cold_page(struct page *page));
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#define __free_page(page) __free_pages((page), 0)
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#define free_page(addr) free_pages((addr),0)
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void page_alloc_init(void);
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void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp);
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#endif /* __LINUX_GFP_H */
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