Index: head/lib/libc/sys/mmap.2
===================================================================
--- head/lib/libc/sys/mmap.2
+++ head/lib/libc/sys/mmap.2
@@ -28,7 +28,7 @@
 .\"	@(#)mmap.2	8.4 (Berkeley) 5/11/95
 .\" $FreeBSD$
 .\"
-.Dd February 18, 2015
+.Dd November 25, 2016
 .Dt MMAP 2
 .Os
 .Sh NAME
@@ -189,6 +189,8 @@
 (every 30-60 seconds usually) which can create performance problems if you
 do not need that to occur (such as when you are using shared file-backed
 mmap regions for IPC purposes).
+Dirty data will be flushed automatically when all mappings of an object are
+removed and all descriptors referencing the object are closed.
 Note that VM/file system coherency is
 maintained whether you use
 .Dv MAP_NOSYNC
Index: head/sys/kern/vfs_subr.c
===================================================================
--- head/sys/kern/vfs_subr.c
+++ head/sys/kern/vfs_subr.c
@@ -3002,7 +3002,7 @@
 	obj = vp->v_object;
 	if (obj != NULL && (obj->flags & OBJ_MIGHTBEDIRTY) != 0) {
 		VM_OBJECT_WLOCK(obj);
-		vm_object_page_clean(obj, 0, 0, OBJPC_NOSYNC);
+		vm_object_page_clean(obj, 0, 0, 0);
 		VM_OBJECT_WUNLOCK(obj);
 	}
 	VOP_INACTIVE(vp, td);