Mercurial > hg > graal-compiler
view test/compiler/5057225/Test5057225.java @ 2149:7e37af9d69ef
7011379: G1: overly long concurrent marking cycles
Summary: This changeset introduces filtering of SATB buffers at the point when they are about to be enqueued. If this filtering clears enough entries on each buffer, the buffer can then be re-used and not enqueued. This cuts down the number of SATB buffers that need to be processed by the concurrent marking threads.
Reviewed-by: johnc, ysr
author | tonyp |
---|---|
date | Wed, 19 Jan 2011 09:35:17 -0500 |
parents | c18cbe5936b8 |
children |
line wrap: on
line source
/* * Copyright (c) 2009, 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. */ /** * @test * @bug 5057225 * @summary Remove useless I2L conversions * * @run main/othervm -Xcomp -XX:CompileOnly=Test5057225.doload Test5057225 */ import java.net.URLClassLoader; public class Test5057225 { static byte[] ba = new byte[] { -1 }; static short[] sa = new short[] { -1 }; static int[] ia = new int[] { -1 }; static final long[] BYTE_MASKS = { 0x0FL, 0x7FL, // 7-bit 0xFFL, }; static final long[] SHORT_MASKS = { 0x000FL, 0x007FL, // 7-bit 0x00FFL, 0x0FFFL, 0x3FFFL, // 14-bit 0x7FFFL, // 15-bit 0xFFFFL, }; static final long[] INT_MASKS = { 0x0000000FL, 0x0000007FL, // 7-bit 0x000000FFL, 0x00000FFFL, 0x00003FFFL, // 14-bit 0x00007FFFL, // 15-bit 0x0000FFFFL, 0x00FFFFFFL, 0x7FFFFFFFL, // 31-bit 0xFFFFFFFFL, }; public static void main(String[] args) throws Exception { for (int i = 0; i < BYTE_MASKS.length; i++) { System.setProperty("value", "" + BYTE_MASKS[i]); loadAndRunClass("Test5057225$loadUB2L"); } for (int i = 0; i < SHORT_MASKS.length; i++) { System.setProperty("value", "" + SHORT_MASKS[i]); loadAndRunClass("Test5057225$loadUS2L"); } for (int i = 0; i < INT_MASKS.length; i++) { System.setProperty("value", "" + INT_MASKS[i]); loadAndRunClass("Test5057225$loadUI2L"); } } static void check(long result, long expected) { if (result != expected) throw new InternalError(result + " != " + expected); } static void loadAndRunClass(String classname) throws Exception { Class cl = Class.forName(classname); URLClassLoader apploader = (URLClassLoader) cl.getClassLoader(); ClassLoader loader = new URLClassLoader(apploader.getURLs(), apploader.getParent()); Class c = loader.loadClass(classname); Runnable r = (Runnable) c.newInstance(); r.run(); } public static class loadUB2L implements Runnable { static final long MASK; static { long value = 0; try { value = Long.decode(System.getProperty("value")); } catch (Throwable e) {} MASK = value; } public void run() { check(doload(ba), MASK); } static long doload(byte[] ba) { return ba[0] & MASK; } } public static class loadUS2L implements Runnable { static final long MASK; static { long value = 0; try { value = Long.decode(System.getProperty("value")); } catch (Throwable e) {} MASK = value; } public void run() { check(doload(sa), MASK); } static long doload(short[] sa) { return sa[0] & MASK; } } public static class loadUI2L implements Runnable { static final long MASK; static { long value = 0; try { value = Long.decode(System.getProperty("value")); } catch (Throwable e) {} MASK = value; } public void run() { check(doload(ia), MASK); } static long doload(int[] ia) { return ia[0] & MASK; } } }