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Index: head/sys/vm/vm_map.c
===================================================================
--- head/sys/vm/vm_map.c
+++ head/sys/vm/vm_map.c
@@ -2186,17 +2186,22 @@
VM_MAP_ASSERT_LOCKED(map);
KASSERT(entry->end > start && entry->start < start,
("_vm_map_clip_start: invalid clip of entry %p", entry));
+ vm_map_simplify_entry(map, entry);
/*
- * Split off the front portion -- note that we must insert the new
- * entry BEFORE this one, so that this entry has the specified
- * starting address.
+ * Create a backing object now, if none exists, so that more individual
+ * objects won't be created after the map entry is split.
*/
- vm_map_simplify_entry(map, entry);
vm_map_entry_charge_object(map, entry);
+
+ /* Clone the entry. */
new_entry = vm_map_entry_create(map);
*new_entry = *entry;
+ /*
+ * Split off the front portion. Insert the new entry BEFORE this one,
+ * so that this entry has the specified starting address.
+ */
new_entry->end = start;
entry->offset += (start - entry->start);
entry->start = start;
@@ -2244,14 +2249,20 @@
KASSERT(entry->start < end && entry->end > end,
("_vm_map_clip_end: invalid clip of entry %p", entry));
-
/*
- * Create a new entry and insert it AFTER the specified entry
+ * Create a backing object now, if none exists, so that more individual
+ * objects won't be created after the map entry is split.
*/
vm_map_entry_charge_object(map, entry);
+
+ /* Clone the entry. */
new_entry = vm_map_entry_create(map);
*new_entry = *entry;
+ /*
+ * Split off the back portion. Insert the new entry AFTER this one,
+ * so that this entry has the specified ending address.
+ */
new_entry->start = entry->end = end;
new_entry->offset += (end - entry->start);
if (new_entry->cred != NULL)

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