| author | kzhaldyb |
| Tue, 14 Jun 2016 19:15:27 +0300 | |
| changeset 39280 | 86907793a181 |
| parent 38256 | 685ac27ed264 |
| child 39618 | ced8c3f59678 |
| permissions | -rw-r--r-- |
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8132710: Add tests which check that Humongous objects behave as expected after Young GC
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/* |
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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The test checks that after different type of GC unreachable objects behave as expected: |
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1. Young GC - weakly referenced non-humongous objects are collected, other objects are not collected. |
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2. Full GC - weakly referenced non-humongous and humongous objects are collected, softly referenced non-humongous and |
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humongous objects are not collected. |
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3. Full GC with memory pressure - weakly and softly referenced non-humongous and humongous objects are collected. |
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4. CMC - weakly referenced non-humongous objects are collected, other objects are not collected since weak references |
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from Young Gen is handled as strong during CMC. |
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5. CMC_NO_SURV_ROOTS - weakly referenced non-humongous and humongous objects are collected, softly referenced |
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non-humongous and humongous objects are not collected since we make 2 Young GC to promote all |
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weak references to Old Gen. |
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The test gets gc type as a command line argument. |
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Then the test allocates object graph in heap (currently testing scenarios are pre-generated and stored in |
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TestcaseData.getPregeneratedTestcases()) with TestObjectGraphAfterGC::allocateObjectGraph. |
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Since we are testing humongous objects we need pretty unusual nodes - arrays of Object. |
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We need this since only large enough array could be Humongous object (in fact class with huge amount of fields is |
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humongous too but it's for other tests). |
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ObjectGraph class generates object graph with Object[] nodes. It also provides a way to collect |
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information about each node using "visitor" pattern. |
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Using visitors we build Set of ReferenceInfo instances which contains the following information: |
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reference - external weak/soft reference to graph's node |
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graphId and nodeId - graph's and node's ids - we need this for error handling |
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softlyReachable - is node effectively referenced by external soft reference. It could be when external |
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soft reference or when this node is reachable from node that exteranally referenced by soft reference |
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effectiveHumongous - if node behaves effectively humongous. It could be when node is humongous |
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or when this node is reachable from humongous node. |
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When we leave TestObjectGraphAfterGC::allocateObjectGraph we make graph reachable only with references from Set of |
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ReferenceInfo instances. |
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We run specified gc and check that each instance of ReferenceInfo set behaves as expected. |
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Then we check that gc log file contains expected tokens and doesn't contain tokens that it should not contain. |