The patch titled
Subject: mm/page_alloc: reduce fallbacks to (MIGRATE_PCPTYPES - 1)
has been added to the -mm mm-unstable branch. Its filename is
mm-page_alloc-reduce-fallbacks-to-migrate_pcptypes-1.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-reduce-fallbacks-to-migrate_pcptypes-1.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Yajun Deng <yajun.deng@xxxxxxxxx>
Subject: mm/page_alloc: reduce fallbacks to (MIGRATE_PCPTYPES - 1)
Date: Fri, 3 Feb 2023 18:01:32 +0800
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@xxxxxxxxx
Signed-off-by: Yajun Deng <yajun.deng@xxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
--- a/mm/page_alloc.c~mm-page_alloc-reduce-fallbacks-to-migrate_pcptypes-1
+++ a/mm/page_alloc.c
@@ -2603,10 +2603,10 @@ struct page *__rmqueue_smallest(struct z
*
* 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_a
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;
_
Patches currently in -mm which might be from yajun.deng@xxxxxxxxx are
mm-page_alloc-reduce-fallbacks-to-migrate_pcptypes-1.patch
