+/*
+ * How much more we allow the heap to grow before triggering another major collection
+ */
+#define SGEN_DEFAULT_ALLOWANCE_HEAP_SIZE_RATIO 0.33
+
+/*
+ * How much more we allow the heap to grow, relative to the allowance, while doing
+ * a concurrent collection, before forcing its finish.
+ */
+#define SGEN_DEFAULT_CONCURRENT_HEAP_ALLOWANCE_RATIO 0.25
+