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Commit 7751b2da authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Linus Torvalds
Browse files

vmscan: split file huge pages before paging them out 

This is preparation of vmscan for file huge pages.  We cannot write out
huge pages, so we need to split them on the way out.

Link: http://lkml.kernel.org/r/1466021202-61880-22-git-send-email-kirill.shutemov@linux.intel.com


Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9a73f61b

mm/vmscan.c

+6 −0
Original line number Diff line number Diff line
@@ -1055,8 +1055,14 @@ static unsigned long shrink_page_list(struct list_head *page_list, 


			/* Adding to swap updated mapping */

			mapping = page_mapping(page);

		} else if (unlikely(PageTransHuge(page))) {

			/* Split file THP */

			if (split_huge_page_to_list(page, page_list))

				goto keep_locked;

		}



		VM_BUG_ON_PAGE(PageTransHuge(page), page);



		/*

		 * The page is mapped into the page tables of one or more

		 * processes. Try to unmap it here.