linux/knl: enforce DRAM subtype for KNL DDR

It's already guessed by memtiers, but set it early anyway since we're sure it's correct.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

hwloc/memattrs.c

@@ -1406,7 +1406,10 @@ hwloc__group_memory_tiers(hwloc_topology_t topology,
     }
   }
 
-  /* sort nodes */
+  /* Sort nodes.
+   * We could also sort by the existing subtype.
+   * KNL is the only case where subtypes are set in backends, but we set memattrs as well there.
+   */
   hwloc_debug("Sorting memory node infos...\n");
   qsort(nodeinfos, n, sizeof(*nodeinfos), compare_node_infos_by_type_and_bw);
 #ifdef HWLOC_DEBUG

hwloc/topology-linux.c

@@ -3274,6 +3274,10 @@ hwloc_linux_knl_add_cluster(struct hwloc_topology *topology,
      */
     hwloc_bitmap_copy(mcdram->cpuset, ddr->cpuset);
 
+    /* also mark ddr as DRAM to match what we do in memattrs.c */
+    assert(ddr);
+    ddr->subtype = strdup("DRAM");
+
     /* Add a Group for Cluster containing this MCDRAM + DDR */
     cluster = hwloc_alloc_setup_object(topology, HWLOC_OBJ_GROUP, HWLOC_UNKNOWN_INDEX);
     hwloc_obj_add_other_obj_sets(cluster, ddr);