fix gh-213

src/box/lua/slab.cc

@@ -97,6 +97,24 @@ lbox_slab_info(struct lua_State *L)
 	lua_pushstring(L, "arena_size");
 	luaL_pushnumber64(L, totals.total);
 	lua_settable(L, -3);
+
+	char value[32];
+	double items_used_perc = 100
+		* ((double)totals.used)
+		/ ((double)talloc.cache->arena->prealloc + 0.0001);
+	snprintf(value, sizeof(value), "%0.1lf%%", items_used_perc);
+	lua_pushstring(L, "items_used_%");
+	lua_pushstring(L, value);
+	lua_settable(L, -3);
+
+	double arena_used_perc = 100
+		* ((double)talloc.cache->arena->used)
+		/ ((double)talloc.cache->arena->prealloc + 0.0001);
+	snprintf(value, sizeof(value), "%0.1lf%%", arena_used_perc);
+	lua_pushstring(L, "arena_used_%");
+	lua_pushstring(L, value);
+	lua_settable(L, -3);
+
 	return 1;
 }
 

test/box/misc.result

@@ -147,9 +147,11 @@ end;
 ...
 t;
 ---
-- - slabs
-  - arena_size
+- - arena_used_%
   - arena_used
+  - items_used_%
+  - arena_size
+  - slabs
 ...
 ----------------
 -- # box.error