[PATCH v13 135/137] mm/vmscan: Optimise shrink_page_list for smaller THPs
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Date: 2021-07-12 04:20:01
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
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@infradead.org> --- mm/vmscan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8b17e46dbf32..433956675107 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c@@ -1496,7 +1496,8 @@ static unsigned int shrink_page_list(struct list_head *page_list, enum ttu_flags 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; try_to_unmap(page, flags);
--
2.30.2