core: don't guess memory tiers if memattrs are disabled

Signed-off-by: Brice Goglin <[email protected]>

Author: bgoglin

hwloc/topology.c

@@ -4291,7 +4291,8 @@ hwloc_topology_load (struct hwloc_topology *topology)
   /* Same for memattrs */
   hwloc_internal_memattrs_need_refresh(topology);
   hwloc_internal_memattrs_refresh(topology);
-  hwloc_internal_memattrs_guess_memory_tiers(topology);
+  if (!(topology->flags & HWLOC_TOPOLOGY_FLAG_NO_MEMATTRS))
+    hwloc_internal_memattrs_guess_memory_tiers(topology);
 
   topology->state &= ~HWLOC_TOPOLOGY_STATE_IS_LOADING;
   topology->state |= HWLOC_TOPOLOGY_STATE_IS_LOADED;

include/hwloc.h

@@ -2347,9 +2347,10 @@ enum hwloc_topology_flags_e {
    */
   HWLOC_TOPOLOGY_FLAG_NO_DISTANCES = (1UL<<7),
 
-  /** \brief Ignore memory attributes.
+  /** \brief Ignore memory attributes and tiers.
    *
-   * Ignore memory attribues from the operating systems (and from XML).
+   * Ignore memory attribues from the operating systems (and from XML)
+   * Hence also do not try to build memory tiers.
    */
   HWLOC_TOPOLOGY_FLAG_NO_MEMATTRS = (1UL<<8),