During memory hotplug, when online/offline a zone, we need to rebuild
the zonelist for all nodes. Current behavior would lose a valid zone in
zonelist since only pick up managed_zone.
There are two cases for a zone with memory but still !managed.
* all pages were allocated via memblock
* all pages were taken by ballooning / virtio-mem
This state maybe temporary, since both of them may release some memory.
Then it end up with a managed zone not in zonelist.
This is introduced in 'commit 6aa303defb74 ("mm, vmscan: only allocate
and reclaim from zones with pages managed by the buddy allocator")'.
This patch restore the behavior.
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
CC: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
CC: David Hildenbrand <david@xxxxxxxxxx>
Fixes: 6aa303defb74 ("mm, vmscan: only allocate and reclaim from zones with pages managed by the buddy allocator")
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index de15021a2887..b433a57ee76f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6092,7 +6092,7 @@ static int build_zonerefs_node(pg_data_t *pgdat, struct zoneref *zonerefs)
do {
zone_type--;
zone = pgdat->node_zones + zone_type;
- if (managed_zone(zone)) {
+ if (populated_zone(zone)) {
zoneref_set_zone(zone, &zonerefs[nr_zones++]);
check_highest_zone(zone_type);
}
--
2.33.1
