+ mm-page_alloc-move-free-pages-when-converting-block-during-isolation.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm: page_alloc: move free pages when converting block during isolation
has been added to the -mm mm-unstable branch.  Its filename is
     mm-page_alloc-move-free-pages-when-converting-block-during-isolation.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-move-free-pages-when-converting-block-during-isolation.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: Johannes Weiner <hannes@cmpxchg.org>
Subject: mm: page_alloc: move free pages when converting block during isolation
Date: Wed, 20 Mar 2024 14:02:09 -0400

When claiming a block during compaction isolation, move any remaining free
pages to the correct freelists as well, instead of stranding them on the
wrong list.  Otherwise, this encourages incompatible page mixing down the
line, and thus long-term fragmentation.

Link: https://lkml.kernel.org/r/20240320180429.678181-5-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Tested-by: "Huang, Ying" <ying.huang@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_alloc.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/mm/page_alloc.c~mm-page_alloc-move-free-pages-when-converting-block-during-isolation
+++ a/mm/page_alloc.c
@@ -2653,9 +2653,12 @@ int __isolate_free_page(struct page *pag
 			 * Only change normal pageblocks (i.e., they can merge
 			 * with others)
 			 */
-			if (migratetype_is_mergeable(mt))
+			if (migratetype_is_mergeable(mt)) {
 				set_pageblock_migratetype(page,
 							  MIGRATE_MOVABLE);
+				move_freepages_block(zone, page,
+						     MIGRATE_MOVABLE, NULL);
+			}
 		}
 	}
 
_

Patches currently in -mm which might be from hannes@cmpxchg.org are

mm-cachestat-fix-two-shmem-bugs.patch
mm-zswap-fix-writeback-shinker-gfp_noio-gfp_nofs-recursion.patch
mm-zswap-optimize-zswap-pool-size-tracking.patch
mm-zpool-return-pool-size-in-pages.patch
mm-page_alloc-remove-pcppage-migratetype-caching.patch
mm-page_alloc-optimize-free_unref_folios.patch
mm-page_alloc-fix-up-block-types-when-merging-compatible-blocks.patch
mm-page_alloc-move-free-pages-when-converting-block-during-isolation.patch
mm-page_alloc-fix-move_freepages_block-range-error.patch
mm-page_alloc-fix-freelist-movement-during-block-conversion.patch
mm-page_alloc-close-migratetype-race-between-freeing-and-stealing.patch
mm-page_isolation-prepare-for-hygienic-freelists.patch
mm-page_isolation-prepare-for-hygienic-freelists-fix.patch
mm-page_alloc-consolidate-free-page-accounting.patch