Index: tmpfs.h
===================================================================
--- tmpfs.h	(revision 217576)
+++ tmpfs.h	(working copy)
@@ -50,6 +50,7 @@
 #include <sys/malloc.h>
 #include <sys/systm.h>
 #include <sys/vmmeter.h>
+#include <sys/eventhandler.h>
 #include <vm/swap_pager.h>
 
 MALLOC_DECLARE(M_TMPFSMNT);
@@ -491,6 +492,7 @@
  * tmpfs).
  * XXX: Should this be tunable through sysctl, for instance? */
 #define TMPFS_PAGES_RESERVED (4 * 1024 * 1024 / PAGE_SIZE)
+#define TMPFS_PAGES_LOWMEM (1 * 1024 * 1024 / PAGE_SIZE)
 
 /*
  * Returns information about the number of available memory pages,
@@ -526,6 +528,10 @@
 	size_t freepages;
 
 	freepages = tmpfs_mem_info();
+	if (freepages < TMPFS_PAGES_LOWMEM + TMPFS_PAGES_RESERVED) {
+		EVENTHANDLER_INVOKE(vm_lowmem, 0);
+		freepages = tmpfs_mem_info();
+	}
 	freepages -= freepages < TMPFS_PAGES_RESERVED ?
 	    freepages : TMPFS_PAGES_RESERVED;