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>
84 lines
2.7 KiB
C
84 lines
2.7 KiB
C
#ifndef _CRIS_PAGE_H
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#define _CRIS_PAGE_H
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#ifdef __KERNEL__
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#include <asm/arch/page.h>
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/* PAGE_SHIFT determines the page size */
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#define PAGE_SHIFT 13
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#ifndef __ASSEMBLY__
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#define PAGE_SIZE (1UL << PAGE_SHIFT)
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#else
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#define PAGE_SIZE (1 << PAGE_SHIFT)
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#endif
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#define PAGE_MASK (~(PAGE_SIZE-1))
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#define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
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#define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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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, vaddr)
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#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
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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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#ifndef __ASSEMBLY__
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typedef struct { unsigned long pte; } pte_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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#endif
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#define pte_val(x) ((x).pte)
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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 __pgd(x) ((pgd_t) { (x) } )
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#define __pgprot(x) ((pgprot_t) { (x) } )
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/* On CRIS the PFN numbers doesn't start at 0 so we have to compensate */
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/* for that before indexing into the page table starting at mem_map */
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#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
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#define pfn_valid(pfn) (((pfn) - (PAGE_OFFSET >> PAGE_SHIFT)) < max_mapnr)
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/* to index into the page map. our pages all start at physical addr PAGE_OFFSET so
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* we can let the map start there. notice that we subtract PAGE_OFFSET because
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* we start our mem_map there - in other ports they map mem_map physically and
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* use __pa instead. in our system both the physical and virtual address of DRAM
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* is too high to let mem_map start at 0, so we do it this way instead (similar
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* to arm and m68k I think)
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*/
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#define virt_to_page(kaddr) (mem_map + (((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT))
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#define VALID_PAGE(page) (((page) - mem_map) < max_mapnr)
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#define virt_addr_valid(kaddr) pfn_valid((unsigned)(kaddr) >> PAGE_SHIFT)
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/* convert a page (based on mem_map and forward) to a physical address
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* do this by figuring out the virtual address and then use __pa
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*/
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#define page_to_phys(page) __pa((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
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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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#ifndef __ASSEMBLY__
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#endif /* __ASSEMBLY__ */
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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 /* _CRIS_PAGE_H */
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