On 1/30/21 5:19 PM, David Rientjes wrote:

On Mon, 25 Jan 2021, Dave Hansen wrote:

quoted

diff -puN mm/migrate.c~0006-node-Define-and-export-memory-migration-path mm/migrate.c

--- a/mm/migrate.c~0006-node-Define-and-export-memory-migration-path	2021-01-25 16:23:09.553866709 -0800
+++ b/mm/migrate.c	2021-01-25 16:23:09.558866709 -0800

@@ -1161,6 +1161,22 @@ out:
 	return rc;
 }
 
+static int node_demotion[MAX_NUMNODES] = {[0 ...  MAX_NUMNODES - 1] = NUMA_NO_NODE};

__read_mostly?

Yep, that's sane.  I'll fix that up in the next revision.