Messages in this thread Patch in this message | | | From | "Matthew Wilcox (Oracle)" <> | Subject | [PATCH v13 131/137] mm/vmscan: Free non-shmem THPs without splitting them | Date | Mon, 12 Jul 2021 04:06:55 +0100 |
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We have to allocate memory in order to split a file-backed page, so it's not a good idea to split them. It also doesn't work for XFS because pages have an extra reference count from page_has_private() and split_huge_page() expects that reference to have already been removed. Unfortunately, we still have to split shmem THPs because we can't handle swapping out an entire THP yet.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> --- mm/vmscan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c index 7a2f25b904d9..8b17e46dbf32 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1470,8 +1470,8 @@ static unsigned int 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 */ + } else if (PageSwapBacked(page) && PageTransHuge(page)) { + /* Split shmem THP */ if (split_huge_page_to_list(page, page_list)) goto keep_locked; } -- 2.30.2
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