Commit 6d192303 authored by Kaiyang Zhao's avatar Kaiyang Zhao Committed by Andrew Morton
Browse files

mm: consider CMA pages in watermark check for NUMA balancing target node 

Currently in migrate_balanced_pgdat(), ALLOC_CMA flag is not passed when
checking watermark on the migration target node.  This does not match the
gfp in alloc_misplaced_dst_folio() which allows allocation from CMA.

This causes promotion failures when there are a lot of available CMA
memory in the system.

Therefore, we change the alloc_flags passed to zone_watermark_ok() in
migrate_balanced_pgdat().

Link: https://lkml.kernel.org/r/20240801180456.25927-1-kaiyang2@cs.cmu.edu


Signed-off-by: default avatarKaiyang Zhao <kaiyang2@cs.cmu.edu>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Reviewed-by: default avatarBaolin Wang <baolin.wang@linux.alibaba.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 81920438

mm/migrate.c

+1 −1
Original line number Diff line number Diff line
@@ -2526,7 +2526,7 @@ static bool migrate_balanced_pgdat(struct pglist_data *pgdat, 
		if (!zone_watermark_ok(zone, 0,

				       high_wmark_pages(zone) +

				       nr_migrate_pages,

				       ZONE_MOVABLE, 0))

				       ZONE_MOVABLE, ALLOC_CMA))

			continue;

		return true;

	}