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Address spaces contain an allocation flag that specifies restriction on the zone for pages placed in the mapping. I.e. some device may require pages to be allocated from a DMA zone. Block devices may not be able to use pages from HIGHMEM. Memory policies and the common use of page migration works only on the highest zone. If the address space does not allow allocation from the highest zone then the pages in the address space are not migratable simply because we can only allocate memory for a specified node if we allow allocation for the highest zone on each node. Acked-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
#ifndef _LINUX_MIGRATE_H
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#define _LINUX_MIGRATE_H
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#include <linux/mm.h>
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#include <linux/mempolicy.h>
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#include <linux/pagemap.h>
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typedef struct page *new_page_t(struct page *, unsigned long private, int **);
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#ifdef CONFIG_MIGRATION
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/* Check if a vma is migratable */
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static inline int vma_migratable(struct vm_area_struct *vma)
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{
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if (vma->vm_flags & (VM_IO|VM_HUGETLB|VM_PFNMAP|VM_RESERVED))
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return 0;
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/*
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* Migration allocates pages in the highest zone. If we cannot
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* do so then migration (at least from node to node) is not
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* possible.
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*/
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if (vma->vm_file &&
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gfp_zone(mapping_gfp_mask(vma->vm_file->f_mapping))
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< policy_zone)
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return 0;
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return 1;
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}
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extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
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extern int putback_lru_pages(struct list_head *l);
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extern int migrate_page(struct address_space *,
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struct page *, struct page *);
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extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);
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extern int fail_migrate_page(struct address_space *,
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struct page *, struct page *);
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extern int migrate_prep(void);
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extern int migrate_vmas(struct mm_struct *mm,
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const nodemask_t *from, const nodemask_t *to,
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unsigned long flags);
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#else
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static inline int vma_migratable(struct vm_area_struct *vma)
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{ return 0; }
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static inline int isolate_lru_page(struct page *p, struct list_head *list)
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{ return -ENOSYS; }
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static inline int putback_lru_pages(struct list_head *l) { return 0; }
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static inline int migrate_pages(struct list_head *l, new_page_t x,
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unsigned long private) { return -ENOSYS; }
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static inline int migrate_pages_to(struct list_head *pagelist,
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struct vm_area_struct *vma, int dest) { return 0; }
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static inline int migrate_prep(void) { return -ENOSYS; }
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static inline int migrate_vmas(struct mm_struct *mm,
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const nodemask_t *from, const nodemask_t *to,
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unsigned long flags)
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{
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return -ENOSYS;
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}
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/* Possible settings for the migrate_page() method in address_operations */
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#define migrate_page NULL
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#define fail_migrate_page NULL
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#endif /* CONFIG_MIGRATION */
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#endif /* _LINUX_MIGRATE_H */
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