D17367.diff
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	Index: head/sys/vm/vm_fault.c
	===================================================================
	--- head/sys/vm/vm_fault.c
	+++ head/sys/vm/vm_fault.c
	@@ -1181,6 +1181,16 @@
	*/
	vm_object_pip_wakeup(fs.object);
	VM_OBJECT_WUNLOCK(fs.object);
	+
	+ /*
	+ * We only try to prefault read-only mappings to the
	+ * neighboring pages when this copy-on-write fault is
	+ * a hard fault. In other cases, trying to prefault
	+ * is typically wasted effort.
	+ */
	+ if (faultcount == 0)
	+ faultcount = 1;
	+
	/*
	* Only use the new page below...
	*/