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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>
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
#ifndef _ALPHA_PAGE_H
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#define _ALPHA_PAGE_H
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#ifdef __KERNEL__
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#include <asm/pal.h>
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 13
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#ifndef __ASSEMBLY__
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#define STRICT_MM_TYPECHECKS
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extern void clear_page(void *page);
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
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alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vmaddr)
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#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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extern void copy_page(void * _to, void * _from);
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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#ifdef STRICT_MM_TYPECHECKS
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/*
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* These are used to make use of C type-checking..
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*/
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pmd; } pmd_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pte_val(x) ((x).pte)
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#define pmd_val(x) ((x).pmd)
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) } )
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#define __pmd(x) ((pmd_t) { (x) } )
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#define __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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#else
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/*
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* .. while these make it easier on the compiler
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*/
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typedef unsigned long pte_t;
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typedef unsigned long pmd_t;
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typedef unsigned long pgd_t;
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typedef unsigned long pgprot_t;
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#define pte_val(x) (x)
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#define pmd_val(x) (x)
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#define pgd_val(x) (x)
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#define pgprot_val(x) (x)
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#define __pte(x) (x)
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#define __pgd(x) (x)
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#define __pgprot(x) (x)
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#endif /* STRICT_MM_TYPECHECKS */
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#ifdef USE_48_BIT_KSEG
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#define PAGE_OFFSET 0xffff800000000000UL
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#else
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#define PAGE_OFFSET 0xfffffc0000000000UL
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#endif
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#else
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#ifdef USE_48_BIT_KSEG
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#define PAGE_OFFSET 0xffff800000000000
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#else
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#define PAGE_OFFSET 0xfffffc0000000000
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#endif
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#endif /* !__ASSEMBLY__ */
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/* to align the pointer to the (next) page boundary */
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#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
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#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
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#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
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#ifndef CONFIG_DISCONTIGMEM
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#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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#endif /* CONFIG_DISCONTIGMEM */
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#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/page.h>
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#endif /* __KERNEL__ */
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#endif /* _ALPHA_PAGE_H */
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