A THP which is smaller than a PMD does not need to do the extra work
in try_to_unmap() of trying to split a PMD entry.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
mm/vmscan.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 1c2e6ca92a45..9e140d19611a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1300,7 +1300,8 @@ static unsigned int shrink_page_list(struct list_head *page_list,
enum ttu_flags flags = ttu_flags | TTU_BATCH_FLUSH;
bool was_swapbacked = PageSwapBacked(page);
- if (unlikely(PageTransHuge(page)))
+ if (PageTransHuge(page) &&
+ thp_order(page) >= HPAGE_PMD_ORDER)
flags |= TTU_SPLIT_HUGE_PMD;
if (!try_to_unmap(page, flags)) {
--
2.28.0
