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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 RTMSpinLoopCount affects time spent
* between locking attempts.
* @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.TestRTMSpinLoopCount
*/
package compiler.rtm.locking;
import compiler.testlibrary.rtm.BusyLock;
import compiler.testlibrary.rtm.CompilableTest;
import compiler.testlibrary.rtm.RTMLockingStatistics;
import compiler.testlibrary.rtm.RTMTestBase;
import jdk.test.lib.Asserts;
import jdk.test.lib.process.OutputAnalyzer;
import jdk.test.lib.cli.CommandLineOptionTest;
import jdk.test.lib.Platform;
import java.util.List;
/**
* Test verifies that RTMSpinLoopCount increase time spent between retries
* by comparing amount of retries done with different RTMSpinLoopCount's values.
*/
public class TestRTMSpinLoopCount {
private static final int LOCKING_TIME = 1000;
private static final int RTM_RETRY_COUNT = 1000;
private static final boolean INFLATE_MONITOR = true;
private static final long MAX_ABORTS = RTM_RETRY_COUNT + 1L;
private static int[] SPIN_LOOP_COUNTS;
protected void runTestCases() throws Throwable {
if (Platform.isPPC()) {
SPIN_LOOP_COUNTS = new int[] { 0, 10, 100, 1_000, 10_000 };
} else {
SPIN_LOOP_COUNTS = new int[] { 0, 100, 1_000, 10_000, 100_000 };
}
long[] aborts = new long[TestRTMSpinLoopCount.SPIN_LOOP_COUNTS.length];
for (int i = 0; i < TestRTMSpinLoopCount.SPIN_LOOP_COUNTS.length; i++) {
aborts[i] = getAbortsCountOnLockBusy(
TestRTMSpinLoopCount.SPIN_LOOP_COUNTS[i]);
}
for (int i = 1; i < aborts.length; i++) {
Asserts.assertLTE(aborts[i], aborts[i - 1], "Increased spin loop "
+ "count should not increase retries count.");
}
}
private long getAbortsCountOnLockBusy(int spinLoopCount) throws Throwable {
CompilableTest test = new BusyLock();
OutputAnalyzer outputAnalyzer = RTMTestBase.executeRTMTest(
test,
CommandLineOptionTest.prepareNumericFlag("RTMRetryCount",
TestRTMSpinLoopCount.RTM_RETRY_COUNT),
CommandLineOptionTest.prepareNumericFlag("RTMSpinLoopCount",
spinLoopCount),
"-XX:-UseRTMXendForLockBusy",
"-XX:RTMTotalCountIncrRate=1",
"-XX:+PrintPreciseRTMLockingStatistics",
BusyLock.class.getName(),
Boolean.toString(TestRTMSpinLoopCount.INFLATE_MONITOR),
Integer.toString(TestRTMSpinLoopCount.LOCKING_TIME)
);
outputAnalyzer.shouldHaveExitValue(0);
List<RTMLockingStatistics> statistics = RTMLockingStatistics.fromString(
test.getMethodWithLockName(), outputAnalyzer.getOutput());
Asserts.assertEQ(statistics.size(), 1,
"VM output should contain exactly one entry for method "
+ test.getMethodWithLockName());
RTMLockingStatistics lock = statistics.get(0);
Asserts.assertLTE(lock.getTotalAborts(),
TestRTMSpinLoopCount.MAX_ABORTS, String.format("Total aborts "
+ "count (%d) should be less or equal to %d",
lock.getTotalAborts(),
TestRTMSpinLoopCount.MAX_ABORTS));
return lock.getTotalAborts();
}
public static void main(String args[]) throws Throwable {
new TestRTMSpinLoopCount().runTestCases();
}
}
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