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migrate_pages: separate hugetlb folios migration
This is a preparation patch to batch the folio unmapping and moving for the non-hugetlb folios. Based on that we can batch the TLB shootdown during the folio migration and make it possible to use some hardware accelerator for the folio copying. In this patch the hugetlb folios and non-hugetlb folios migration is separated in migrate_pages() to make it easy to change the non-hugetlb folios migration implementation. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: "Huang, Ying" <[email protected]> Reviewed-by: Baolin Wang <[email protected]> Reviewed-by: Xin Hao <[email protected]> Cc: Zi Yan <[email protected]> Cc: Yang Shi <[email protected]> Cc: Oscar Salvador <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Bharata B Rao <[email protected]> Cc: Alistair Popple <[email protected]> Cc: Minchan Kim <[email protected]> Cc: Mike Kravetz <[email protected]> Cc: Hyeonggon Yoo <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
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