[PATCHv8 16/32] vmscan: split file huge pages before paging them out

Kirill A. Shutemov
2016-05-12T15:44:34Z

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.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
mm/vmscan.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index e9fe17c96ef8..df56f6a2dbfe 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -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.
--
2.8.1