Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/utilities/ProgressiveHeapVisitor.java @ 6725:da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes
Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland
Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author | coleenp |
---|---|
date | Sat, 01 Sep 2012 13:25:18 -0400 |
parents | c18cbe5936b8 |
children |
line wrap: on
line source
/* * Copyright (c) 2000, 2006, 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. * */ package sun.jvm.hotspot.utilities; import sun.jvm.hotspot.memory.*; import sun.jvm.hotspot.oops.*; /** This class wraps a user's chosen HeapVisitor with the functionality that a chosen "thunk" is called periodically during the heap traversal. This allows a progress bar to be displayed during long heap scans. */ public class ProgressiveHeapVisitor implements HeapVisitor { private HeapVisitor userHeapVisitor; private HeapProgressThunk thunk; private long usedSize; private long visitedSize; private double lastNotificationFraction; private static double MINIMUM_NOTIFICATION_FRACTION = 0.01; public ProgressiveHeapVisitor(HeapVisitor userHeapVisitor, HeapProgressThunk thunk) { this.userHeapVisitor = userHeapVisitor; this.thunk = thunk; } public void prologue(long usedSize) { this.usedSize = usedSize; visitedSize = 0; userHeapVisitor.prologue(usedSize); } public boolean doObj(Oop obj) { userHeapVisitor.doObj(obj); visitedSize += obj.getObjectSize(); double curFrac = (double) visitedSize / (double) usedSize; if (curFrac > lastNotificationFraction + MINIMUM_NOTIFICATION_FRACTION) { thunk.heapIterationFractionUpdate(curFrac); lastNotificationFraction = curFrac; } return false; } public void epilogue() { userHeapVisitor.epilogue(); thunk.heapIterationComplete(); } }