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: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2016-07-26 15:25:56 -07:00 коммит произвёл Linus Torvalds
Родитель 9a73f61bdb
Коммит 7751b2da6b
1 изменённых файлов: 6 добавлений и 0 удалений

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@ -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.