On Wed 13-02-19 11:32:31, Peter Zijlstra wrote:

On Wed, Feb 13, 2019 at 10:43:15AM +0100, Michal Hocko wrote:

quoted

@@ -5259,6 +5261,11 @@ static void build_zonelists(pg_data_t *pgdat)
 
 	build_zonelists_in_node_order(pgdat, node_order, nr_nodes);
 	build_thisnode_zonelists(pgdat);
+
+	pr_info("node[%d] zonelist: ", pgdat->node_id);
+	for_each_zone_zonelist(zone, z, &pgdat->node_zonelists[ZONELIST_FALLBACK], MAX_NR_ZONES-1)
+		pr_cont("%d:%s ", zone_to_nid(zone), zone->name);
+	pr_cont("\n");
 }

Have you ran this by the SGI and other stupid large machine vendors?

I do not have such a large machine handy. The biggest I have has
handfull (say dozen) of NUMA nodes.

Traditionally they tend to want to remove such things instead of adding
them.

I do not insist on this patch but I find it handy. If there is an
opposition I will not miss it much.
-- 
Michal Hocko
SUSE Labs