The patch titled
Subject: mm/page_alloc: only search higher order when fallback
has been added to the -mm mm-unstable branch. Its filename is
mm-page_alloc-only-search-higher-order-when-fallback.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-only-search-higher-order-when-fallback.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: Abel Wu <wuyun.abel@xxxxxxxxxxxxx>
Subject: mm/page_alloc: only search higher order when fallback
Date: Wed, 3 Aug 2022 10:51:21 +0800
It seems unnecessary to search pages with order < alloc_order in
fallback allocation.
This can currently happen with ALLOC_NOFRAGMENT and alloc_order >
pageblock_order, so add a test to prevent it.
[vbabka@xxxxxxx: changelog addition]
Link: https://lkml.kernel.org/r/20220803025121.47018-1-wuyun.abel@xxxxxxxxxxxxx
Signed-off-by: Abel Wu <wuyun.abel@xxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_alloc-only-search-higher-order-when-fallback
+++ a/mm/page_alloc.c
@@ -3010,7 +3010,7 @@ __rmqueue_fallback(struct zone *zone, in
* i.e. orders < pageblock_order. If there are no local zones free,
* the zonelists will be reiterated without ALLOC_NOFRAGMENT.
*/
- if (alloc_flags & ALLOC_NOFRAGMENT)
+ if (order < pageblock_order && alloc_flags & ALLOC_NOFRAGMENT)
min_order = pageblock_order;
/*
_
Patches currently in -mm which might be from wuyun.abel@xxxxxxxxxxxxx are
mm-mempolicy-fix-lock-contention-on-mems_allowed.patch
mm-page_alloc-only-search-higher-order-when-fallback.patch
