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8291555: Implement alternative fast-locking scheme

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Co-authored-by: Fei Yang <fyang@openjdk.org>
Co-authored-by: Thomas Stuefe <stuefe@openjdk.org>
Reviewed-by: dcubed, stuefe, shade, dholmes, dlong
This commit is contained in:
Roman Kennke 2023-05-08 17:51:39 +00:00
parent 4116b109f0
commit 7f6358a8b5
70 changed files with 2444 additions and 767 deletions
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60
src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/LockingMode.java Normal file
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/*
* Copyright Amazon.com Inc. 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.runtime;
import sun.jvm.hotspot.types.TypeDataBase;
/** Encapsulates the LockingMode enum in globalDefinitions.hpp in
the VM. */
public class LockingMode {
private static int monitor;
private static int legacy;
private static int lightweight;
static {
VM.registerVMInitializedObserver(
(o, d) -> initialize(VM.getVM().getTypeDataBase()));
}
private static synchronized void initialize(TypeDataBase db) {
monitor = db.lookupIntConstant("LM_MONITOR").intValue();
legacy = db.lookupIntConstant("LM_LEGACY").intValue();
lightweight = db.lookupIntConstant("LM_LIGHTWEIGHT").intValue();
}
public static int getMonitor() {
return monitor;
}
public static int getLegacy() {
return legacy;
}
public static int getLightweight() {
return lightweight;
}
}