diff --git a/sys/sys/eventhandler.h b/sys/sys/eventhandler.h
index 59b1fc2cff9..13782179d73 100644
--- a/sys/sys/eventhandler.h
+++ b/sys/sys/eventhandler.h
@@ -179,5 +179,9 @@ typedef void (*idle_eventhandler_t)(void *, int);
 #define IDLE_PRI_LAST		20000
 EVENTHANDLER_FAST_DECLARE(idle_event, idle_eventhandler_t);
 
+/* Low memory event */
+typedef void (*vm_lowmem_handler_t)(void *, int);
+#define	LOWMEM_PRI_DEFAULT	0
+EVENTHANDLER_DECLARE(vm_lowmem, vm_lowmem_handler_t);
 
 #endif /* SYS_EVENTHANDLER_H */
diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index 1f024e7cf83..ec43082a238 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -76,6 +76,7 @@
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>
+#include <sys/eventhandler.h>
 #include <sys/lock.h>
 #include <sys/mutex.h>
 #include <sys/proc.h>
@@ -677,11 +678,18 @@ vm_pageout_scan(int pass)
 	struct thread *td;
 
 	GIANT_REQUIRED;
+	/*
+	 * Decrease registered cache sizes.
+	 */
+	EVENTHANDLER_INVOKE(vm_lowmem, 0);
+	/*
+	 * We do this explicitly after the caches have been drained above.
+	 */
+	uma_reclaim();
 	/*
 	 * Do whatever cleanup that the pmap code can.
 	 */
 	vm_pageout_pmap_collect();
-	uma_reclaim();
 
 	addl_page_shortage_init = vm_pageout_deficit;
 	vm_pageout_deficit = 0;