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236c32eb10
The migrate_prep{_local} never fails, so it is pointless to have return
value and check the return value.
Link: https://lkml.kernel.org/r/20201113205359.556831-5-shy828301@gmail.com
Signed-off-by: Yang Shi <shy828301@gmail.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Song Liu <songliubraving@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
201 lines
6 KiB
C
201 lines
6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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/migrate_mode.h>
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#include <linux/hugetlb.h>
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typedef struct page *new_page_t(struct page *page, unsigned long private);
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typedef void free_page_t(struct page *page, unsigned long private);
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struct migration_target_control;
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/*
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* Return values from addresss_space_operations.migratepage():
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* - negative errno on page migration failure;
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* - zero on page migration success;
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*/
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#define MIGRATEPAGE_SUCCESS 0
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enum migrate_reason {
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MR_COMPACTION,
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MR_MEMORY_FAILURE,
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MR_MEMORY_HOTPLUG,
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MR_SYSCALL, /* also applies to cpusets */
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MR_MEMPOLICY_MBIND,
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MR_NUMA_MISPLACED,
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MR_CONTIG_RANGE,
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MR_TYPES
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};
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/* In mm/debug.c; also keep sync with include/trace/events/migrate.h */
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extern const char *migrate_reason_names[MR_TYPES];
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#ifdef CONFIG_MIGRATION
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extern void putback_movable_pages(struct list_head *l);
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extern int migrate_page(struct address_space *mapping,
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struct page *newpage, struct page *page,
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enum migrate_mode mode);
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extern int migrate_pages(struct list_head *l, new_page_t new, free_page_t free,
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unsigned long private, enum migrate_mode mode, int reason);
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extern struct page *alloc_migration_target(struct page *page, unsigned long private);
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extern int isolate_movable_page(struct page *page, isolate_mode_t mode);
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extern void putback_movable_page(struct page *page);
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extern void migrate_prep(void);
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extern void migrate_prep_local(void);
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extern void migrate_page_states(struct page *newpage, struct page *page);
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extern void migrate_page_copy(struct page *newpage, struct page *page);
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extern int migrate_huge_page_move_mapping(struct address_space *mapping,
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struct page *newpage, struct page *page);
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extern int migrate_page_move_mapping(struct address_space *mapping,
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struct page *newpage, struct page *page, int extra_count);
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#else
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static inline void putback_movable_pages(struct list_head *l) {}
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static inline int migrate_pages(struct list_head *l, new_page_t new,
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free_page_t free, unsigned long private, enum migrate_mode mode,
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int reason)
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{ return -ENOSYS; }
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static inline struct page *alloc_migration_target(struct page *page,
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unsigned long private)
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{ return NULL; }
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static inline int isolate_movable_page(struct page *page, isolate_mode_t mode)
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{ return -EBUSY; }
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static inline int migrate_prep(void) { return -ENOSYS; }
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static inline int migrate_prep_local(void) { return -ENOSYS; }
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static inline void migrate_page_states(struct page *newpage, struct page *page)
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{
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}
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static inline void migrate_page_copy(struct page *newpage,
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struct page *page) {}
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static inline int migrate_huge_page_move_mapping(struct address_space *mapping,
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struct page *newpage, struct page *page)
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{
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return -ENOSYS;
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}
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#endif /* CONFIG_MIGRATION */
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#ifdef CONFIG_COMPACTION
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extern int PageMovable(struct page *page);
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extern void __SetPageMovable(struct page *page, struct address_space *mapping);
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extern void __ClearPageMovable(struct page *page);
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#else
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static inline int PageMovable(struct page *page) { return 0; };
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static inline void __SetPageMovable(struct page *page,
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struct address_space *mapping)
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{
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}
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static inline void __ClearPageMovable(struct page *page)
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{
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}
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#endif
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#ifdef CONFIG_NUMA_BALANCING
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extern bool pmd_trans_migrating(pmd_t pmd);
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extern int migrate_misplaced_page(struct page *page,
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struct vm_area_struct *vma, int node);
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#else
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static inline bool pmd_trans_migrating(pmd_t pmd)
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{
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return false;
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}
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static inline int migrate_misplaced_page(struct page *page,
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struct vm_area_struct *vma, int node)
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{
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return -EAGAIN; /* can't migrate now */
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}
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#endif /* CONFIG_NUMA_BALANCING */
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#if defined(CONFIG_NUMA_BALANCING) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
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extern int migrate_misplaced_transhuge_page(struct mm_struct *mm,
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struct vm_area_struct *vma,
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pmd_t *pmd, pmd_t entry,
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unsigned long address,
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struct page *page, int node);
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#else
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static inline int migrate_misplaced_transhuge_page(struct mm_struct *mm,
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struct vm_area_struct *vma,
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pmd_t *pmd, pmd_t entry,
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unsigned long address,
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struct page *page, int node)
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{
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return -EAGAIN;
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}
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#endif /* CONFIG_NUMA_BALANCING && CONFIG_TRANSPARENT_HUGEPAGE*/
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#ifdef CONFIG_MIGRATION
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/*
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* Watch out for PAE architecture, which has an unsigned long, and might not
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* have enough bits to store all physical address and flags. So far we have
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* enough room for all our flags.
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*/
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#define MIGRATE_PFN_VALID (1UL << 0)
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#define MIGRATE_PFN_MIGRATE (1UL << 1)
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#define MIGRATE_PFN_LOCKED (1UL << 2)
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#define MIGRATE_PFN_WRITE (1UL << 3)
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#define MIGRATE_PFN_SHIFT 6
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static inline struct page *migrate_pfn_to_page(unsigned long mpfn)
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{
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if (!(mpfn & MIGRATE_PFN_VALID))
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return NULL;
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return pfn_to_page(mpfn >> MIGRATE_PFN_SHIFT);
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}
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static inline unsigned long migrate_pfn(unsigned long pfn)
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{
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return (pfn << MIGRATE_PFN_SHIFT) | MIGRATE_PFN_VALID;
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}
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enum migrate_vma_direction {
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MIGRATE_VMA_SELECT_SYSTEM = 1 << 0,
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MIGRATE_VMA_SELECT_DEVICE_PRIVATE = 1 << 1,
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};
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struct migrate_vma {
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struct vm_area_struct *vma;
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/*
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* Both src and dst array must be big enough for
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* (end - start) >> PAGE_SHIFT entries.
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*
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* The src array must not be modified by the caller after
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* migrate_vma_setup(), and must not change the dst array after
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* migrate_vma_pages() returns.
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*/
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unsigned long *dst;
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unsigned long *src;
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unsigned long cpages;
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unsigned long npages;
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unsigned long start;
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unsigned long end;
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/*
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* Set to the owner value also stored in page->pgmap->owner for
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* migrating out of device private memory. The flags also need to
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* be set to MIGRATE_VMA_SELECT_DEVICE_PRIVATE.
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* The caller should always set this field when using mmu notifier
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* callbacks to avoid device MMU invalidations for device private
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* pages that are not being migrated.
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*/
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void *pgmap_owner;
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unsigned long flags;
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};
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int migrate_vma_setup(struct migrate_vma *args);
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void migrate_vma_pages(struct migrate_vma *migrate);
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void migrate_vma_finalize(struct migrate_vma *migrate);
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#endif /* CONFIG_MIGRATION */
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#endif /* _LINUX_MIGRATE_H */
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