The quilt patch titled Subject: mm: page_alloc: allowing mTHP compaction to capture the freed page directly has been removed from the -mm tree. Its filename was mm-page_alloc-allowing-mthp-compaction-to-capture-the-freed-page-directly.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> Subject: mm: page_alloc: allowing mTHP compaction to capture the freed page directly Date: Fri, 12 Apr 2024 11:27:04 +0800 Currently, compaction_capture() does not allow lower-order allocations to directly capture the movable free pages, even though lower-order allocations might also be requesting movable pages, that can lead to more compaction scanning. And, with the enablement of mTHP, such situations will become more common. Thus allowing lower-order (mTHP) allocations of movable page types directly capture the movable free pages can avoid unnecessary compaction scanning, meanwhile that won't pollute the movable pageblock. With testing 1M mTHP compaction, it can be seen that compaction scanning is significantly reduced. mm-unstable patched Ops Compaction pages isolated 116598741.00 120946702.00 Ops Compaction migrate scanned 1764870054.00 1488621550.00 Ops Compaction free scanned 7707879039.00 4986299318.00 Ops Compact scan efficiency 22.90 29.85 Ops Compaction cost 73797.69 72933.48 Link: https://lkml.kernel.org/r/8118a5d66a034736a48433beddaca60ed78577c4.1712892329.git.baolin.wang@xxxxxxxxxxxxxxxxx Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> Reviewed-by: Zi Yan <ziy@xxxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Cc: David Hildenbrand <david@xxxxxxxxxx> Cc: "Huang, Ying" <ying.huang@xxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Cc: Ryan Roberts <ryan.roberts@xxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/mm/page_alloc.c~mm-page_alloc-allowing-mthp-compaction-to-capture-the-freed-page-directly +++ a/mm/page_alloc.c @@ -595,12 +595,14 @@ compaction_capture(struct capture_contro return false; /* - * Do not let lower order allocations pollute a movable pageblock. + * Do not let lower order allocations pollute a movable pageblock + * unless compaction is also requesting movable pages. * This might let an unmovable request use a reclaimable pageblock * and vice-versa but no more than normal fallback logic which can * have trouble finding a high-order free page. */ - if (order < pageblock_order && migratetype == MIGRATE_MOVABLE) + if (order < pageblock_order && migratetype == MIGRATE_MOVABLE && + capc->cc->migratetype != MIGRATE_MOVABLE) return false; capc->page = page; _ Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are