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mm: page_alloc: move free pages when converting block during isolation

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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>
Tested-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2024-03-20 14:02:09 -04:00 committed by Andrew Morton
parent e6cf9e1c4c
commit b54ccd3c6b
1 changed files with 4 additions and 1 deletions
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5
mm/page_alloc.c
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@ -2653,9 +2653,12 @@ int __isolate_free_page(struct page *page, unsigned int order)
* 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);
}
}
}