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authorYajun Deng <yajun.deng@linux.dev>2023-02-03 13:01:32 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-10 03:51:41 +0300
commitaa02d3c174abfc506058d3e43f471bc4280563d0 (patch)
tree10d3ee81e4eafc4ba2110588b0994587c029b06f /mm/page_alloc.c
parent601c3c29dbeb049862faa00917f2daf094a71028 (diff)
downloadlinux-aa02d3c174abfc506058d3e43f471bc4280563d0.tar.xz
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 <yajun.deng@linux.dev> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Zi Yan <ziy@nvidia.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: David Hildenbrand <david@redhat.com> Cc: Mike Rapoport <rppt@linux.ibm.com> Cc: Oscar Salvador <osalvador@suse.de> Cc: Mike Rapoport <rppt@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c13
1 files changed, 5 insertions, 8 deletions
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;