[PATCH v5 28/39] mm: Avoid splitting large pages
From: Matthew Wilcox <willy@infradead.org>
Date: 2020-05-29 03:01:44
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
From: "Matthew Wilcox (Oracle)" <willy@infradead.org> If the filesystem supports large pages, then do not split them before removing them from the page cache; remove them as a unit. --- mm/vmscan.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index b06868fc4926..51e6c135575d 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c@@ -1271,9 +1271,10 @@ 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))) { + } else if (PageTransHuge(page)) { /* Split file THP */ - if (split_huge_page_to_list(page, page_list)) + if (!mapping_large_pages(mapping) && + split_huge_page_to_list(page, page_list)) goto keep_locked; }
--
2.26.2