annotate src/share/vm/runtime/reflectionCompat.hpp @ 1145:e018e6884bd8

6631166: CMS: better heuristics when combatting fragmentation Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking. Reviewed-by: jmasa
author ysr
date Wed, 23 Dec 2009 09:23:54 -0800
parents a61af66fc99e
children c18cbe5936b8
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1 /*
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2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // During the development of the JDK 1.4 reflection implementation
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26 // based on dynamic bytecode generation, it was hoped that the bulk of
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27 // the native code for reflection could be removed. Unfortunately
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28 // there is currently a significant cost associated with loading the
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29 // stub classes which impacts startup time. Until this cost can be
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30 // reduced, the JVM entry points JVM_InvokeMethod and
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31 // JVM_NewInstanceFromConstructor are still needed; these and their
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32 // dependents currently constitute the bulk of the native code for
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33 // reflection. If this cost is reduced in the future, the
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34 // NativeMethodAccessorImpl and NativeConstructorAccessorImpl classes
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35 // can be removed from sun.reflect and all of the code guarded by this
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36 // flag removed from the product build. (Non-product builds,
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37 // specifically the "optimized" target, would retain the code so they
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38 // could be dropped into earlier JDKs for comparative benchmarking.)
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39
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40 //#ifndef PRODUCT
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41 # define SUPPORT_OLD_REFLECTION
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42 //#endif