2 files changed, 30 insertions, 0 deletions

diff --git a/sys/vm/uma.h b/sys/vm/uma.h
index 2076d3bd0b61..f0522b01631d 100644
--- a/sys/vm/uma.h
+++ b/sys/vm/uma.h
@@ -459,6 +459,18 @@ int uma_zone_set_obj(uma_zone_t zone, struct vm_object *obj, int size);
 void uma_zone_set_max(uma_zone_t zone, int nitems);
 
 /*
+ * Obtains the effective limit on the number of items in a zone
+ *
+ * Arguments:
+ *	zone  The zone to obtain the effective limit from
+ *
+ * Return:
+ *	0  No limit
+ *	int  The effective limit of the zone
+ */
+int uma_zone_get_max(uma_zone_t zone);
+
+/*
  * The following two routines (uma_zone_set_init/fini)
  * are used to set the backend init/fini pair which acts on an
  * object as it becomes allocated and is placed in a slab within
diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c
index 2dcd14fdd1a3..558b4c727e75 100644
--- a/sys/vm/uma_core.c
+++ b/sys/vm/uma_core.c
@@ -2797,6 +2797,24 @@ uma_zone_set_max(uma_zone_t zone, int nitems)
 }
 
 /* See uma.h */
+int
+uma_zone_get_max(uma_zone_t zone)
+{
+	int nitems;
+	uma_keg_t keg;
+
+	ZONE_LOCK(zone);
+	keg = zone_first_keg(zone);
+	if (keg->uk_maxpages)
+		nitems = keg->uk_maxpages * keg->uk_ipers;
+	else
+		nitems = 0;
+	ZONE_UNLOCK(zone);
+
+	return (nitems);
+}
+
+/* See uma.h */
 void
 uma_zone_set_init(uma_zone_t zone, uma_init uminit)
 {