--- /dev/null	2018-05-02 09:10:36.097102948 -0700
+++ new/test/hotspot/jtreg/vmTestbase/metaspace/gc/readme.txt	2018-05-08 10:20:19.229631998 -0700
@@ -0,0 +1,47 @@
+ Copyright (c) 2013, 2018, Oracle and/or its affiliates. All rights reserved.
+ DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+
+ This code is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License version 2 only, as
+ published by the Free Software Foundation.
+
+ This code is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ version 2 for more details (a copy is included in the LICENSE file that
+ accompanied this code).
+
+ You should have received a copy of the GNU General Public License version
+ 2 along with this work; if not, write to the Free Software Foundation,
+ Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+
+ Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ or visit www.oracle.com if you need additional information or have any
+ questions.
+
+
+
+metaspace/gc tests - are the test for the Metaspace GC tuning, which is described in the
+Java SE 8 HotSpot[tm] Virtual Machine Garbage  Collection Tuning
+
+Tests load classes and monitor the used/committed amounts of metaspace.
+There are three types of tests all extending base class - MetaspaceBaseGC
+
+MemoryUsageTest -
+  trivial test to check memory dynamic (loading classes should lead to growth
+  of used memory, gc to reduce)
+
+FirstGCTest -
+  loads classes until the GC has happened and check the GC has happened at the
+  right moment (as stated in the Spec)
+
+HighWaterMarkTest
+  The test loads classes until the committed metaspace achieves the certain
+  level between MetaspaceSize and MaxMetaspaceSize.
+  Then it counts how many times GC has been induced.
+  Test verifies that MinMetaspaceFreeRatio/MaxMetaspaceFreeRatio settings
+  affect the frequency of GC. (High-water mark)
+
+Note: GC could be caused not by Metaspace. When GC happens, the tests check
+gc.log file to find the reason of GC. Tests will pass if there is no guarantee
+that GC was induced by metaspace.