From aa02d3c174abfc506058d3e43f471bc4280563d0 Mon Sep 17 00:00:00 2001 From: Yajun Deng Date: Fri, 3 Feb 2023 18:01:32 +0800 Subject: mm/page_alloc: reduce fallbacks to (MIGRATE_PCPTYPES - 1) The commit 1dd214b8f21c ("mm: page_alloc: avoid merging non-fallbackable pageblocks with others") has removed MIGRATE_CMA and MIGRATE_ISOLATE from fallbacks list. so there is no need to add an element at the end of every type. Reduce fallbacks to (MIGRATE_PCPTYPES - 1). Link: https://lkml.kernel.org/r/20230203100132.1627787-1-yajun.deng@linux.dev Signed-off-by: Yajun Deng Acked-by: Vlastimil Babka Cc: Zi Yan Cc: Mel Gorman Cc: David Hildenbrand Cc: Mike Rapoport Cc: Oscar Salvador Cc: Mike Rapoport Signed-off-by: Andrew Morton --- mm/page_alloc.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) (limited to 'mm/page_alloc.c') diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 5ebce58026f1..21d820c42900 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2603,10 +2603,10 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order, * * The other migratetypes do not have fallbacks. */ -static int fallbacks[MIGRATE_TYPES][3] = { - [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, - [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_TYPES }, - [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_TYPES }, +static int fallbacks[MIGRATE_TYPES][MIGRATE_PCPTYPES - 1] = { + [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE }, + [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE }, + [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE }, }; #ifdef CONFIG_CMA @@ -2865,11 +2865,8 @@ int find_suitable_fallback(struct free_area *area, unsigned int order, return -1; *can_steal = false; - for (i = 0;; i++) { + for (i = 0; i < MIGRATE_PCPTYPES - 1 ; i++) { fallback_mt = fallbacks[migratetype][i]; - if (fallback_mt == MIGRATE_TYPES) - break; - if (free_area_empty(area, fallback_mt)) continue; -- cgit v1.2.3