author | mchung |
Mon, 22 Oct 2018 17:00:04 -0700 | |
changeset 52220 | 9c260a6b6471 |
parent 50525 | 767cdb97f103 |
child 54159 | 7c23a4432610 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2017, 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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/* |
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* @test |
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* @bug 8059022 |
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* @modules java.base/jdk.internal.misc:+open |
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* @summary Validate barriers after Unsafe getReference, CAS and swap (GetAndSet) |
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* @requires vm.gc.Z & !vm.graal.enabled |
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* @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseZGC -XX:+UnlockDiagnosticVMOptions -XX:+ZUnmapBadViews -XX:ZCollectionInterval=1 -XX:-CreateCoredumpOnCrash -XX:CompileCommand=dontinline,*::mergeImpl* compiler.gcbarriers.UnsafeIntrinsicsTest |
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*/ |
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package compiler.gcbarriers; |
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import java.lang.reflect.Field; |
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import java.util.ArrayList; |
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import java.util.Random; |
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import sun.misc.Unsafe; |
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public class UnsafeIntrinsicsTest { |
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/* |
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* This test triggers the loadbarriers by allocating a lot, keeping the objects alive and then |
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* letting them die in a way that maximizes fragmentation. |
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* |
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* All subtests (OperationType's) could run in parallel. |
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*/ |
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static int node_count = 133700; |
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static int thread_count = 4; |
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static int time = Integer.getInteger("time", 4); // seconds per subtest |
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static Runner r = new Runner(null, 1, 1, Runner.OperationType.CAS); |
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static Node first_node; |
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int epoch = 0; |
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public static void main(String[] args) { |
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UnsafeIntrinsicsTest t = new UnsafeIntrinsicsTest(); |
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t.testWithLocalData(Runner.OperationType.CAS); |
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t.testWithLocalData(Runner.OperationType.Weak_CAS); |
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t.testWithLocalData(Runner.OperationType.CMPX); |
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t.testWithSharedData(Runner.OperationType.Swap); |
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t.testWithSharedData(Runner.OperationType.Load); |
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} |
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public UnsafeIntrinsicsTest() { |
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} |
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public void testWithLocalData(Runner.OperationType optype) { |
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System.out.println("Testing " + optype.name() + " with " + thread_count +" thread and " + node_count + " nodes"); |
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// start mutator threads |
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ArrayList<Thread> thread_list = new ArrayList<Thread>(); |
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Random r = new Random(System.nanoTime()); |
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for (int i = 0; i < thread_count; i++) { |
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setup(); // each thread has its own circle of nodes |
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Thread t = new Thread(new Runner(first_node, time, r.nextLong(), optype)); |
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t.start(); |
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thread_list.add(t); |
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} |
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waitForCompletion(thread_list); |
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countNodes(); |
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} |
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public void testWithSharedData(Runner.OperationType optype) { |
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System.out.println("Testing " + optype.name() + " with " + thread_count +" thread and " + node_count + " nodes"); |
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setup(); // All nodes are shared between threads |
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ArrayList<Thread> thread_list = new ArrayList<Thread>(); |
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Random r = new Random(System.nanoTime()); |
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for (int i = 0; i < thread_count; i++) { |
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Thread t = new Thread(new Runner(first_node, time, r.nextLong(), optype)); |
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t.start(); |
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thread_list.add(t); |
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} |
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waitForCompletion(thread_list); |
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countNodes(); |
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} |
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public void waitForCompletion(ArrayList<Thread> thread_list) { |
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// do some waiting |
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try { |
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Thread.sleep(time*1000); |
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} catch (InterruptedException e) { |
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e.printStackTrace(); |
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} |
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// wait for all thread to terminate |
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for (int i = 0; i < thread_count; i++) { |
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try { |
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thread_list.get(i).join(); |
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} catch (InterruptedException e) { |
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e.printStackTrace(); |
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} |
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} |
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} |
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|
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void countNodes() { |
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epoch++; |
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int count = 0; |
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Node node = first_node; |
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while (node.number() < epoch) { |
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node.setNumber(epoch); |
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count++; |
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node = node.next(); |
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} |
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System.out.println("Program end, found " + count + " nodes"); |
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} |
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|
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// Create a circular linked list |
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public void setup() { |
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first_node = new Node(); |
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Node last_node = first_node; |
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for (int i = 0; i < node_count; i++) { |
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last_node = new Node(last_node); |
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} |
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first_node.setNext(last_node); |
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} |
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} |
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|
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class Runner implements Runnable { |
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|
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OperationType type; |
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Node current; |
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Random r; |
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long time; |
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long seed; |
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|
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long milage = 0; |
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long created = 0; |
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long skipped = 0; |
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int iterations = 0; |
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|
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static final jdk.internal.misc.Unsafe UNSAFE; |
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static final long offset; |
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|
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public enum OperationType { |
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Load("Load"), |
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Swap("Swap"), |
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CAS("CAS"), |
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Weak_CAS("Weak-CAS"), |
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CMPX("CMPX"); |
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|
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private String name; |
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private OperationType(String name) { this.name = name; } |
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} |
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|
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static { |
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try { |
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Field f = jdk.internal.misc.Unsafe.class.getDeclaredField("theUnsafe"); |
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f.setAccessible(true); |
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UNSAFE = (jdk.internal.misc.Unsafe) f.get(null); |
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offset = UNSAFE.objectFieldOffset(Node.class.getDeclaredField("next")); |
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} catch (Exception e) { |
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throw new RuntimeException("Unable to get Unsafe instance.", e); |
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} |
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} |
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|
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public Runner(Node start, int testtime, long seed, OperationType type) { |
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current = start; |
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time = testtime*1000000000L; |
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r = new Random(seed); |
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this.type = type; |
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} |
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|
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@Override |
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public void run() { |
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long starttime = System.nanoTime(); |
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while((System.nanoTime() - starttime) < time) { |
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iterations++; |
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// Run a bit |
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int run_length = r.nextInt() & 0xfff; |
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for (int i = 0; i < run_length; i++) { |
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current = current.next(); |
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milage++; |
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} |
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// find a start node |
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Node startNode = current; |
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Node expectedNext = startNode.next; |
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|
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// Run a bit more |
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int skip_length = (r.nextInt() & 0xff) + 1; |
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for (int i = 0; i < skip_length; i++) { |
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current = current.next(); |
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skipped++; |
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} |
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|
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// create a branch |
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int branch_length = (r.nextInt() & 0xff) + 1; |
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created += branch_length; |
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Node head = makeBranch(current, branch_length); |
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|
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// complete circle, but continue to run on old path |
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boolean test_fail = ((iterations & 0x1) == 0); |
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Node current = merge(startNode, expectedNext, head, test_fail); |
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} |
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System.out.println("Milage: " + milage + " Skipped: " + skipped + " Created: " + created + " iterations: " + iterations); |
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} |
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|
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/* |
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* The reason for the duplicated code that is wrapping the unsafe operations is that we want |
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* to test the operations individually. They must not interfere with each other - checking a field |
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* will heal that reference and no operation after can trigger the barrier. |
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* |
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* All mergeImpl*-method are prevented from being inlined. |
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*/ |
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|
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private Node merge(Node startNode, Node expectedNext, Node head, boolean test_fail) { |
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switch (type) { |
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case Load: |
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return mergeImplLoad(startNode, expectedNext, head); |
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case Swap: |
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return mergeImplSwap(startNode, expectedNext, head); |
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case CAS: |
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if (test_fail) { |
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return mergeImplCASFail(startNode, expectedNext, head); |
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} else { |
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return mergeImplCAS(startNode, expectedNext, head); |
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} |
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case Weak_CAS: |
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if (test_fail) { |
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return mergeImplWeakCASFail(startNode, expectedNext, head); |
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} else { |
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return mergeImplWeakCAS(startNode, expectedNext, head); |
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} |
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case CMPX: |
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if (test_fail) { |
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return mergeImplCMPXFail(startNode, expectedNext, head); |
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} else { |
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return mergeImplCMPX(startNode, expectedNext, head); |
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} |
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default: |
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throw new Error("Unimplemented"); |
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} |
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} |
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|
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private Node mergeImplLoad(Node startNode, Node expectedNext, Node head) { |
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// Atomic load version |
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Node temp = (Node) UNSAFE.getReference(startNode, offset); |
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startNode.setNext(head); |
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return temp; |
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} |
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|
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private Node mergeImplSwap(Node startNode, Node expectedNext, Node head) { |
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// Swap version |
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return (Node) UNSAFE.getAndSetReference(startNode, offset, head); |
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} |
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|
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private Node mergeImplCAS(Node startNode, Node expectedNext, Node head) { |
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// CAS - should always be true within a single thread - no other thread can have overwritten |
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if (!UNSAFE.compareAndSetReference(startNode, offset, expectedNext, head)) { |
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throw new Error("CAS should always succeed on thread local objects, check you barrier implementation"); |
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} |
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return expectedNext; // continue on old circle |
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} |
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|
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private Node mergeImplCASFail(Node startNode, Node expectedNext, Node head) { |
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// Force a fail |
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if (UNSAFE.compareAndSetReference(startNode, offset, "fail", head)) { |
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throw new Error("This CAS should always fail, check you barrier implementation"); |
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} |
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if (startNode.next() != expectedNext) { |
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throw new Error("Shouldn't have changed"); |
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} |
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return current; |
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293 |
} |
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294 |
|
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private Node mergeImplWeakCAS(Node startNode, Node expectedNext, Node head) { |
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// Weak CAS - should always be true within a single thread - no other thread can have overwritten |
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if (!UNSAFE.weakCompareAndSetReference(startNode, offset, expectedNext, head)) { |
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throw new Error("Weak CAS should always succeed on thread local objects, check you barrier implementation"); |
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} |
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return expectedNext; // continue on old circle |
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} |
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302 |
|
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303 |
private Node mergeImplWeakCASFail(Node startNode, Node expectedNext, Node head) { |
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// Force a fail |
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305 |
if (UNSAFE.weakCompareAndSetReference(startNode, offset, "fail", head)) { |
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306 |
throw new Error("This weak CAS should always fail, check you barrier implementation"); |
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} |
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308 |
if (startNode.next() != expectedNext) { |
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|
309 |
throw new Error("Shouldn't have changed"); |
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310 |
} |
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311 |
return current; |
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312 |
} |
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313 |
|
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314 |
private Node mergeImplCMPX(Node startNode, Node expectedNext, Node head) { |
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315 |
// CmpX - should always be true within a single thread - no other thread can have overwritten |
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|
316 |
Object res = UNSAFE.compareAndExchangeReference(startNode, offset, expectedNext, head); |
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317 |
if (!res.equals(expectedNext)) { |
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|
318 |
throw new Error("Fail CmpX should always succeed on thread local objects, check you barrier implementation"); |
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319 |
} |
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320 |
return expectedNext; // continue on old circle |
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|
321 |
} |
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|
322 |
|
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323 |
private Node mergeImplCMPXFail(Node startNode, Node expectedNext, Node head) { |
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324 |
Object res = UNSAFE.compareAndExchangeReference(startNode, offset, head, head); |
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if (startNode.next() != expectedNext) { |
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|
326 |
throw new Error("Shouldn't have changed"); |
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327 |
} |
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328 |
if (head == expectedNext) { |
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329 |
throw new Error("Test malfunction"); |
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330 |
} |
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|
331 |
if (!res.equals(expectedNext)) { |
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|
332 |
throw new Error("This CmpX should have returned 'expectedNext' when it failed"); |
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|
333 |
} |
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|
334 |
if (res.equals(head)) { |
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|
335 |
throw new Error("This CmpX shouldn't have returned head when it failed. count: "+ iterations); |
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|
336 |
} |
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|
337 |
|
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|
338 |
return current; |
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339 |
} |
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340 |
|
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341 |
// Create a new branch that will replace a part of the circle |
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342 |
public Node makeBranch(Node end_node, int count) { |
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Node head = end_node; |
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344 |
for (int i = 0; i < count; i++) { |
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head = new Node(head); |
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346 |
} |
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347 |
return head; |
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348 |
} |
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} |
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class Node { |
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Node next; |
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int number = 0; |
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|
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public int number() { |
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return number; |
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} |
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|
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public void setNumber(int v) { |
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number = v; |
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} |
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|
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public Node() { |
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} |
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|
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public Node(Node link) { |
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next = link; |
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} |
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|
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public void setNext(Node next) { |
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this.next = next; |
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} |
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public Node next() { |
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return next; |
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} |
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} |