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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-07-26 15:25:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-26 16:19:19 -0700
commit7751b2da6be0b59da0838a05153a646df1affbce (patch)
tree451727d9d00902b1d91c33449832344435977453
parent9a73f61bdb8acdc01bbaf72a3fe0a8854f2463ad (diff)
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>
-rw-r--r--mm/vmscan.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 93ba33789ac6..21d417ccff69 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.