Index: subr_pool.c
===================================================================
RCS file: /cvs/src/sys/kern/subr_pool.c,v
retrieving revision 1.173
diff -u -p -r1.173 subr_pool.c
--- subr_pool.c	22 Dec 2014 00:33:40 -0000	1.173
+++ subr_pool.c	22 Dec 2014 01:44:52 -0000
@@ -40,6 +40,8 @@
 #include <sys/syslog.h>
 #include <sys/rwlock.h>
 #include <sys/sysctl.h>
+#include <sys/task.h>
+#include <sys/timeout.h>
 
 #include <uvm/uvm_extern.h>
 
@@ -160,6 +162,12 @@ void	 pool_print1(struct pool *, const c
 
 #define pool_sleep(pl) msleep(pl, &pl->pr_mtx, PSWP, pl->pr_wchan, 0)
 
+/* stale page garbage collectors */
+void	pool_gc_sched(void *);
+void	pool_gc_pages(void *, void *);
+struct timeout pool_gc_tick;
+struct task pool_gc_task = TASK_INITIALIZER(pool_gc_pages, NULL, NULL);
+
 static inline int
 phtree_compare(struct pool_item_header *a, struct pool_item_header *b)
 {
@@ -312,6 +320,10 @@ pool_init(struct pool *pp, size_t size, 
 
 		/* make sure phpool wont "recurse" */
 		KASSERT(POOL_INPGHDR(&phpool));
+
+		/* set up GC while here */
+		timeout_set(&pool_gc_tick, pool_gc_sched, NULL);
+		timeout_add_sec(&pool_gc_tick, 1);
 	}
 
 	/* pglistalloc/constraint parameters */
@@ -1337,6 +1349,45 @@ done:
 	rw_exit_read(&pool_lock);
 
 	return (rv);
+}
+
+void
+pool_gc_sched(void *x)
+{
+	task_add(systq, &pool_gc_task);
+}
+
+void
+pool_gc_pages(void *x, void *y)
+{
+	extern int ticks;
+	struct pool *pp;
+	struct pool_item_header *ph, *freeph;
+	int s;
+
+	rw_enter_read(&pool_lock);
+	s = splvm();
+	SIMPLEQ_FOREACH(pp, &pool_head, pr_poollist) {
+		mtx_enter(&pp->pr_mtx);
+
+		/* is it time to free a page? */
+		if (pp->pr_nidle > pp->pr_minpages &&
+		    (ph = TAILQ_FIRST(&pp->pr_emptypages)) != NULL &&
+		    (ticks - ph->ph_tick) > (hz * 8)) {
+			freeph = ph;
+			pool_p_remove(pp, freeph);
+		} else
+			freeph = NULL;
+
+		mtx_leave(&pp->pr_mtx);
+
+		if (freeph != NULL)
+			pool_p_free(pp, freeph);
+	}
+	splx(s); /* XXX */
+	rw_exit_read(&pool_lock);
+
+	timeout_add_sec(&pool_gc_tick, 1);
 }
 
 /*