| Date | Wed, 23 Jun 2021 10:35:00 +0200 | From | Christoph Hellwig <> | Subject | Re: [PATCH v2 20/46] mm/migrate: Add folio_migrate_copy() |
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> +void folio_migrate_copy(struct folio *newfolio, struct folio *folio) > { > + unsigned int i = folio_nr_pages(folio) - 1; > > + copy_highpage(folio_page(newfolio, i), folio_page(folio, i)); > + while (i-- > 0) { > + cond_resched()a > + /* folio_page() handles discontinuities in memmap */ > + copy_highpage(folio_page(newfolio, i), folio_page(folio, i)); > + } > +
What is the advantage of copying backwards here to start with?
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