The patch titled
Subject: mm/page_alloc: Let GFP_ATOMIC order-0 allocs access highatomic reserves
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
mm-page_alloc-let-gfp_atomic-order-0-allocs-access-highatomic-reserves-v2.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-let-gfp_atomic-order-0-allocs-access-highatomic-reserves-v2.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Matt Fleming <mfleming@xxxxxxxxxxxxxx>
Subject: mm/page_alloc: Let GFP_ATOMIC order-0 allocs access highatomic reserves
Date: Tue, 15 Oct 2024 13:51:58 +0100
update comment
Link: https://lkml.kernel.org/r/20241015125158.3597702-1-matt@xxxxxxxxxxxxxxxx
Link: https://lore.kernel.org/all/CAGis_TWzSu=P7QJmjD58WWiu3zjMTVKSzdOwWE8ORaGytzWJwQ@xxxxxxxxxxxxxx/
Fixes: 1d91df85f399 ("mm/page_alloc: handle a missing case for memalloc_nocma_{save/restore} APIs")
Signed-off-by: Matt Fleming <mfleming@xxxxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/mm/page_alloc.c~mm-page_alloc-let-gfp_atomic-order-0-allocs-access-highatomic-reserves-v2
+++ a/mm/page_alloc.c
@@ -2893,10 +2893,10 @@ struct page *rmqueue_buddy(struct zone *
page = __rmqueue(zone, order, migratetype, alloc_flags);
/*
- * If the allocation fails, allow OOM handling access
- * to HIGHATOMIC reserves as failing now is worse than
- * failing a high-order atomic allocation in the
- * future.
+ * If the allocation fails, allow OOM handling and
+ * order-0 (atomic) allocs access to HIGHATOMIC
+ * reserves as failing now is worse than failing a
+ * high-order atomic allocation in the future.
*/
if (!page && (alloc_flags & (ALLOC_OOM|ALLOC_NON_BLOCK)))
page = __rmqueue_smallest(zone, order, MIGRATE_HIGHATOMIC);
_
Patches currently in -mm which might be from mfleming@xxxxxxxxxxxxxx are
mm-page_alloc-let-gfp_atomic-order-0-allocs-access-highatomic-reserves.patch
mm-page_alloc-let-gfp_atomic-order-0-allocs-access-highatomic-reserves-v2.patch
