D52538.1787222891.diff
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D52538.1787222891.diff
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	diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
	--- a/sys/vm/vm_fault.c
	+++ b/sys/vm/vm_fault.c
	@@ -1456,11 +1456,10 @@
	* and we could end up trying to pagein and pageout the same page
	* simultaneously.
	*
	- * We can theoretically allow the busy case on a read fault if the page
	- * is marked valid, but since such pages are typically already pmap'd,
	- * putting that special case in might be more effort then it is worth.
	- * We cannot under any circumstances mess around with a shared busied
	- * page except, perhaps, to pmap it.
	+ * We allow the busy case on a read fault if the page is valid. We
	+ * cannot under any circumstances mess around with a shared busied
	+ * page except, perhaps, to pmap it. This is controlled by the
	+ * VM_ALLOC_SBUSY bit in the allocflags argument.
	*/
	static void
	vm_fault_busy_sleep(struct faultstate *fs, int allocflags)