Once we have decided to swap out a process, don't delay the laundering of

its per-thread kernel stack pages by making them pass through the inactive
queue first.  Instead, immediately place them in the laundry so that they
might be cleaned and made available for reclamation sooner.

Reviewed by:	kib, markj
MFC after:	1 week

sys/vm/vm_swapout.c

@@ -546,7 +546,7 @@ vm_thread_swapout(struct thread *td)
 			panic("vm_thread_swapout: kstack already missing?");
 		vm_page_dirty(m);
 		vm_page_lock(m);
-		vm_page_unwire(m, PQ_INACTIVE);
+		vm_page_unwire(m, PQ_LAUNDRY);
 		vm_page_unlock(m);
 	}
 	VM_OBJECT_WUNLOCK(ksobj);