[PATCHv8 16/32] vmscan: split file huge pages before paging them out
From: Kirill A. Shutemov <hidden>
Date: 2016-05-12 15:40:56
Also in:
linux-fsdevel, lkml
Subsystem:
memory management, memory management - mglru (multi-gen lru), memory management - reclaim, the rest · Maintainers:
Andrew Morton, Johannes Weiner, Linus Torvalds
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 <redacted> --- 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
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