diff --git a/nova/compute/provider_tree.py b/nova/compute/provider_tree.py
index 1f1de71a5f4..d101f65660b 100644
--- a/nova/compute/provider_tree.py
+++ b/nova/compute/provider_tree.py
@@ -168,8 +168,12 @@ def update_inventory(self, inventory, generation):
         """
         self._update_generation(generation, 'update_inventory')
         if self.has_inventory_changed(inventory):
+            LOG.debug('Updating inventory in ProviderTree for provider %s '
+                      'with inventory: %s', self.uuid, inventory)
             self.inventory = copy.deepcopy(inventory)
             return True
+        LOG.debug('Inventory has not changed in ProviderTree for provider: %s',
+                  self.uuid)
         return False
 
     def have_traits_changed(self, new):
diff --git a/nova/scheduler/client/report.py b/nova/scheduler/client/report.py
index 66c31b4a389..ff5c11adc9f 100644
--- a/nova/scheduler/client/report.py
+++ b/nova/scheduler/client/report.py
@@ -756,6 +756,9 @@ def _refresh_and_get_inventory(self, context, rp_uuid):
         if curr is None:
             return None
 
+        LOG.debug('Updating ProviderTree inventory for provider %s from '
+                  '_refresh_and_get_inventory using data: %s', rp_uuid,
+                  curr['inventories'])
         self._provider_tree.update_inventory(
             rp_uuid, curr['inventories'],
             generation=curr['resource_provider_generation'])
@@ -863,12 +866,15 @@ def _update_inventory_attempt(self, context, rp_uuid, inv_data):
         # update_resource_stats() is called? :(
         curr = self._refresh_and_get_inventory(context, rp_uuid)
         if curr is None:
+            LOG.debug('No inventory for provider: %s', rp_uuid, inv_data)
             return False
 
         cur_gen = curr['resource_provider_generation']
 
         # Check to see if we need to update placement's view
         if not self._provider_tree.has_inventory_changed(rp_uuid, inv_data):
+            LOG.debug('Inventory has not changed for provider %s based '
+                      'on inventory data: %s', rp_uuid, inv_data)
             return True
 
         payload = {
@@ -961,11 +967,11 @@ def _update_inventory_attempt(self, context, rp_uuid, inv_data):
         # Update our view of the generation for next time
         updated_inventories_result = result.json()
         new_gen = updated_inventories_result['resource_provider_generation']
-
+        LOG.debug('Updating ProviderTree inventory for provider %s with '
+                  'generation %s from _update_inventory_attempt with data: '
+                  '%s', rp_uuid, new_gen, inv_data)
         self._provider_tree.update_inventory(rp_uuid, inv_data,
                                              generation=new_gen)
-        LOG.debug('Updated inventory for %s at generation %i',
-                  rp_uuid, new_gen)
         return True
 
     @safe_connect
@@ -1110,6 +1116,8 @@ def do_put(url, payload):
 
         # If not different from what we've got, short out
         if not self._provider_tree.has_inventory_changed(rp_uuid, inv_data):
+            LOG.debug('Inventory has not changed for provider %s based '
+                      'on inventory data: %s', rp_uuid, inv_data)
             return
 
         # Ensure non-standard resource classes exist, creating them if needed.
@@ -1125,6 +1133,9 @@ def do_put(url, payload):
         resp = do_put(url, payload)
 
         if resp.status_code == 200:
+            LOG.debug('Updated inventory for provider %s with generation %s '
+                      'in Placement from _set_inventory_for_provider using '
+                      'data: %s', rp_uuid, generation, inv_data)
             json = resp.json()
             self._provider_tree.update_inventory(
                 rp_uuid, json['inventories'],