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/*
* Copyright (c) 2014, 2016, 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 8031320
* @summary Verify that RTMLockingThreshold affects rtm state transition
* ProfileRTM => UseRTM.
* @library /test/lib /
* @modules java.base/jdk.internal.misc
* java.management
* @requires vm.flavor == "server" & !vm.emulatedClient & vm.rtm.cpu & vm.rtm.os
* @build sun.hotspot.WhiteBox
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions
* -XX:+WhiteBoxAPI
* compiler.rtm.locking.TestRTMLockingThreshold
*/
package compiler.rtm.locking;
import compiler.testlibrary.rtm.AbortProvoker;
import compiler.testlibrary.rtm.CompilableTest;
import compiler.testlibrary.rtm.RTMLockingStatistics;
import compiler.testlibrary.rtm.RTMTestBase;
import jdk.internal.misc.Unsafe;
import jdk.test.lib.Asserts;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.cli.CommandLineOptionTest;
import java.util.List;
/**
* Test verifies that RTMLockingThreshold option actually affects how soon
* method will be deoptimized on low abort ratio.
*/
public class TestRTMLockingThreshold {
/**
* We use non-zero abort threshold to avoid abort related to
* interrupts, VMM calls, etc. during first lock attempt.
*
*/
private static final int MIN_ABORT_THRESHOLD = 10;
protected void runTestCases() throws Throwable {
verifyLockingThreshold(0, false);
verifyLockingThreshold(100, false);
verifyLockingThreshold(1000, false);
verifyLockingThreshold(0, true);
verifyLockingThreshold(100, true);
verifyLockingThreshold(1000, true);
}
private void verifyLockingThreshold(int lockingThreshold,
boolean useStackLock) throws Throwable {
CompilableTest test = new Test();
int abortThreshold = Math.max(lockingThreshold / 2,
TestRTMLockingThreshold.MIN_ABORT_THRESHOLD);
OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest(
test,
"-XX:CompileThreshold=1",
CommandLineOptionTest.prepareBooleanFlag("UseRTMForStackLocks",
useStackLock),
"-XX:+UseRTMDeopt",
"-XX:RTMTotalCountIncrRate=1",
"-XX:RTMRetryCount=0",
CommandLineOptionTest.prepareNumericFlag("RTMAbortThreshold",
abortThreshold),
CommandLineOptionTest.prepareNumericFlag("RTMLockingThreshold",
lockingThreshold),
"-XX:RTMAbortRatio=100",
"-XX:+PrintPreciseRTMLockingStatistics",
Test.class.getName(),
Boolean.toString(!useStackLock),
Integer.toString(lockingThreshold)
);
outputAnalyzer.shouldHaveExitValue(0);
List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString(
test.getMethodWithLockName(), outputAnalyzer.getOutput());
Asserts.assertEQ(statistics.size(), 2, "VM output should contain two "
+ "RTM locking statistics entries.");
/**
* If RTMLockingThreshold==0, then we have to make at least 1 call.
*/
long expectedValue = lockingThreshold;
if (expectedValue == 0) {
expectedValue++;
}
RTMLockingStatistics statBeforeDeopt = null;
for (RTMLockingStatistics s : statistics) {
if (s.getTotalLocks() == expectedValue) {
Asserts.assertNull(statBeforeDeopt,
"Only one statistics entry should contain aborts");
statBeforeDeopt = s;
}
}
Asserts.assertNotNull(statBeforeDeopt, "There should be exactly one "
+ "statistics entry corresponding to ProfileRTM state.");
}
public static class Test implements CompilableTest {
// Following field have to be static in order to avoid escape analysis.
@SuppressWarnings("UnsuedDeclaration")
private static int field = 0;
private static final int TOTAL_ITERATIONS = 10000;
private static final Unsafe UNSAFE = Unsafe.getUnsafe();
private final Object monitor = new Object();
@Override
public String getMethodWithLockName() {
return this.getClass().getName() + "::lock";
}
@Override
public String[] getMethodsToCompileNames() {
return new String[] { getMethodWithLockName() };
}
public void lock(boolean abort) {
synchronized(monitor) {
if (abort) {
Test.field += Test.UNSAFE.pageSize();
}
}
}
/**
* Usage:
* Test <inflate monitor>
*/
public static void main(String args[]) throws Throwable {
Asserts.assertGTE(args.length, 2, "Two arguments required.");
Test t = new Test();
boolean shouldBeInflated = Boolean.valueOf(args[0]);
int lockingThreshold = Integer.valueOf(args[1]);
if (shouldBeInflated) {
AbortProvoker.inflateMonitor(t.monitor);
}
for (int i = 0; i < Test.TOTAL_ITERATIONS; i++) {
AbortProvoker.verifyMonitorState(t.monitor, shouldBeInflated);
t.lock(i >= lockingThreshold / 2);
}
}
}
public static void main(String args[]) throws Throwable {
new TestRTMLockingThreshold().runTestCases();
}
}
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