diff --git a/kern/include/lib.h b/kern/include/lib.h
index 498ec28..5374a96 100644
--- a/kern/include/lib.h
+++ b/kern/include/lib.h
@@ -130,6 +130,7 @@ void *kmalloc(size_t size);
 void kfree(void *ptr);
 void kheap_printstats(void);
 void kheap_printused(void);
+unsigned long kheap_getused(void);
 void kheap_nextgeneration(void);
 void kheap_dump(void);
 void kheap_dumpall(void);
diff --git a/kern/vm/kmalloc.c b/kern/vm/kmalloc.c
index f38dc37..3a5abbc 100644
--- a/kern/vm/kmalloc.c
+++ b/kern/vm/kmalloc.c
@@ -819,17 +819,17 @@ kheap_printstats(void)
 	spinlock_release(&kmalloc_spinlock);
 }
 
+
 /*
- * Print number of used heap bytes.
+ * Return the number of used bytes.
  */
-void
-kheap_printused(void)
-{
+
+unsigned long
+kheap_getused(void) {
 	struct pageref *pr;
 	unsigned long total = 0;
-	char total_string[32];
 
-	/* print the whole thing with interrupts off */
+	/* compute with interrupts off */
 	spinlock_acquire(&kmalloc_spinlock);
 	for (pr = allbase; pr != NULL; pr = pr->next_all) {
 		total += subpage_stats(pr, true);
@@ -837,7 +837,18 @@ kheap_printused(void)
 	total += coremap_used_bytes();
 	spinlock_release(&kmalloc_spinlock);
 
-	snprintf(total_string, sizeof(total_string), "%lu", total);
+	return total;
+}
+
+/*
+ * Print number of used bytes.
+ */
+
+void
+kheap_printused(void)
+{
+	char total_string[32];
+	snprintf(total_string, sizeof(total_string), "%lu", kheap_getused());
 	secprintf(SECRET, total_string, "khu");
 }
 
diff --git a/test161/tests/synch/cvt1.t b/test161/tests/synch/cvt1.t
index 55e206d..7777395 100644
--- a/test161/tests/synch/cvt1.t
+++ b/test161/tests/synch/cvt1.t
@@ -2,9 +2,11 @@
 name: "CV Test 1"
 description:
   Tests core CV functionality through cyclic waiting.
-tags: [synch, cvs]
+tags: [synch, cvs, kleaks]
 depends: [boot, semaphores, locks]
 sys161:
   cpus: 32
 ---
+khu
 cvt1
+khu
diff --git a/test161/tests/synch/cvt2.t b/test161/tests/synch/cvt2.t
index da00f74..95625c5 100644
--- a/test161/tests/synch/cvt2.t
+++ b/test161/tests/synch/cvt2.t
@@ -3,9 +3,11 @@ name: "CV Test 2"
 description:
   Tests core CV functionality through a mixture of sleeping and waking
   threads.
-tags: [synch, cvs]
+tags: [synch, cvs, kleaks]
 depends: [boot, semaphores, locks]
 sys161:
   cpus: 32
 ---
+khu
 cvt2
+khu
diff --git a/test161/tests/synch/cvt5.t b/test161/tests/synch/cvt5.t
index 0a9cd48..09338fb 100644
--- a/test161/tests/synch/cvt5.t
+++ b/test161/tests/synch/cvt5.t
@@ -1,10 +1,12 @@
 ---
 name: "CV Test 5"
 description:
-  Tests CV and location relationship.
-tags: [synch, cvs]
+  Tests CV and lock relationship.
+tags: [synch, cvs, kleaks]
 depends: [boot, locks]
 sys161:
   cpus: 32
 ---
+khu
 cvt5
+khu
diff --git a/test161/tests/synch/lt1.t b/test161/tests/synch/lt1.t
index a64df15..e1528b9 100644
--- a/test161/tests/synch/lt1.t
+++ b/test161/tests/synch/lt1.t
@@ -2,9 +2,11 @@
 name: "Lock Test 1"
 description:
   Tests core lock functionality through modifications to shared state.
-tags: [synch, locks]
+tags: [synch, locks, kleaks]
 depends: [boot, semaphores]
 sys161:
   cpus: 32
 ---
+khu
 lt1
+khu
diff --git a/test161/tests/synch/rwt1.t b/test161/tests/synch/rwt1.t
index 52c89d5..ef008e7 100644
--- a/test161/tests/synch/rwt1.t
+++ b/test161/tests/synch/rwt1.t
@@ -3,9 +3,11 @@ name: "RW Lock Test 1"
 description:
   Tests core reader-writer lock functionality by reading and writing shared
   state.
-tags: [synch, rwlocks]
+tags: [synch, rwlocks, kleaks]
 depends: [boot, semaphores]
 sys161:
   cpus: 32
 ---
+khu
 rwt1
+khu
diff --git a/test161/tests/synch/rwt2.t b/test161/tests/synch/rwt2.t
index cb2900a..2dbe216 100644
--- a/test161/tests/synch/rwt2.t
+++ b/test161/tests/synch/rwt2.t
@@ -3,9 +3,11 @@ name: "RW Lock Test 2"
 description:
   Tests that reader-writer locks allow maximum read concurrency when no
   writers are waiting.
-tags: [synch, rwlocks]
+tags: [synch, rwlocks, kleaks]
 depends: [boot, semaphores, cvs]
 sys161:
   cpus: 32
 ---
+khu
 rwt2
+khu
diff --git a/test161/tests/synch/sem1.t b/test161/tests/synch/sem1.t
index d8b0afc..61a27e3 100644
--- a/test161/tests/synch/sem1.t
+++ b/test161/tests/synch/sem1.t
@@ -2,9 +2,11 @@
 name: "Semaphore Test"
 description:
   Tests core semaphore logic through cycling signaling.
-tags: [synch, semaphores]
+tags: [synch, semaphores, kleaks]
 depends: [boot]
 sys161:
   cpus: 32
 ---
+khu
 sem1
+khu
diff --git a/test161/tests/synchprobs/sp1.t b/test161/tests/synchprobs/sp1.t
index 454add7..b3925ad 100644
--- a/test161/tests/synchprobs/sp1.t
+++ b/test161/tests/synchprobs/sp1.t
@@ -3,4 +3,6 @@ name: "Whalemating Test"
 tags: [synchprobs]
 depends: [boot, semaphores, locks]
 ---
+khu
 sp1
+khu
diff --git a/test161/tests/synchprobs/sp2.t b/test161/tests/synchprobs/sp2.t
index ca6e1ea..9a53695 100644
--- a/test161/tests/synchprobs/sp2.t
+++ b/test161/tests/synchprobs/sp2.t
@@ -3,4 +3,6 @@ name: "Stoplight Test"
 tags: [synchprobs]
 depends: [boot, semaphores, locks, cvs]
 ---
+khu
 sp2
+khu