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8132723: Add tests which check that soft references to humongous objects should work correctly

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8132724: Add tests which check that weak references to humongous objects should work correctly

Reviewed-by: jmasa, dfazunen
This commit is contained in:
Kirill Zhaldybin 2015-12-17 16:46:41 +03:00
parent a22ed33318
commit 772ddb7a4f
2 changed files with 222 additions and 1 deletions
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14
hotspot/src/share/vm/prims/whitebox.cpp
View File

@ -309,6 +309,18 @@ WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
return hr->is_humongous();
WB_END
WB_ENTRY(jboolean, WB_G1BelongsToHumongousRegion(JNIEnv* env, jobject o, jlong addr))
G1CollectedHeap* g1 = G1CollectedHeap::heap();
const HeapRegion* hr = g1->heap_region_containing((void*) addr);
return hr->is_humongous();
WB_END
WB_ENTRY(jboolean, WB_G1BelongsToFreeRegion(JNIEnv* env, jobject o, jlong addr))
G1CollectedHeap* g1 = G1CollectedHeap::heap();
const HeapRegion* hr = g1->heap_region_containing((void*) addr);
return hr->is_free();
WB_END
WB_ENTRY(jlong, WB_G1NumMaxRegions(JNIEnv* env, jobject o))
G1CollectedHeap* g1 = G1CollectedHeap::heap();
size_t nr = g1->max_regions();
@ -1479,6 +1491,8 @@ static JNINativeMethod methods[] = {
#if INCLUDE_ALL_GCS
{CC"g1InConcurrentMark", CC"()Z", (void*)&WB_G1InConcurrentMark},
{CC"g1IsHumongous0", CC"(Ljava/lang/Object;)Z",(void*)&WB_G1IsHumongous },
{CC"g1BelongsToHumongousRegion0", CC"(J)Z", (void*)&WB_G1BelongsToHumongousRegion},
{CC"g1BelongsToFreeRegion0", CC"(J)Z", (void*)&WB_G1BelongsToFreeRegion},
{CC"g1NumMaxRegions", CC"()J", (void*)&WB_G1NumMaxRegions },
{CC"g1NumFreeRegions", CC"()J", (void*)&WB_G1NumFreeRegions },
{CC"g1RegionSize", CC"()I", (void*)&WB_G1RegionSize },

207
hotspot/test/gc/g1/humongousObjects/TestObjectCollected.java Normal file
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@ -0,0 +1,207 @@
/*
* Copyright (c) 2015, 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 gc.g1.humongousObjects;
import gc.testlibrary.Helpers;
import jdk.test.lib.Asserts;
import sun.hotspot.WhiteBox;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.SoftReference;
import java.lang.ref.WeakReference;
/**
* @test TestObjectCollected
* @summary checks that after different type of GCs weak/soft references to humongous object behave correspondingly to
* actual object behavior
* @requires vm.gc=="G1" | vm.gc=="null"
* @library /testlibrary /test/lib /
* @modules java.management
* @build sun.hotspot.WhiteBox
* gc.testlibrary.Helpers
* gc.g1.humongousObjects.TestObjectCollected
*
* @run driver ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
*
* @run main/othervm -XX:+UseG1GC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
* -XX:+WhiteBoxAPI -Xbootclasspath/a:. -Xms200m -Xmx200m -Xlog:gc
* -XX:InitiatingHeapOccupancyPercent=100 -XX:G1HeapRegionSize=1M -Xlog:gc=info:file=TestObjectCollected.gc.log
* gc.g1.humongousObjects.TestObjectCollected
*/
/**
* Test checks that after different type of GCs weak/soft references to humongous object behave correspondingly to
* actual object behavior.
* So if object was collected, reference.get() should return null and vice versa
* Since we check humongous objects after such an object is collected the region where it was allocated becomes free
* or/and change type to non-humongous. Two WhiteBox method were used - first returns if a region containing certain
* address is free and second - if a region containing certain address is humongous
*/
public class TestObjectCollected {
/**
* Provides methods to initiate GC of requested type
*/
private enum GC {
YOUNG_CG {
@Override
public void provoke() {
WHITE_BOX.youngGC();
}
},
FULL_GC {
@Override
public void provoke() {
System.gc();
}
},
CMC {
@Override
public void provoke() {
Helpers.waitTillCMCFinished(WHITE_BOX, 0);
WHITE_BOX.g1StartConcMarkCycle();
Helpers.waitTillCMCFinished(WHITE_BOX, 0);
}
},
FULL_GC_MEMORY_PRESSURE {
@Override
public void provoke() {
WHITE_BOX.fullGC();
}
};
private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
public abstract void provoke();
}
/**
* Factory for weak and soft references.
* Allocates byte array of ALLOCATION_SIZE and returns weak/soft reference on it.
*/
private enum REF_FACTORY {
WEAK {
@Override
public Reference<byte[]> create() {
return new WeakReference<>(new byte[ALLOCATION_SIZE], referenceQueqe);
}
},
SOFT {
@Override
public Reference<byte[]> create() {
return new SoftReference<>(new byte[ALLOCATION_SIZE], referenceQueqe);
}
};
private static final ReferenceQueue<byte[]> referenceQueqe = new ReferenceQueue<>();
private static final int ALLOCATION_SIZE = WhiteBox.getWhiteBox().g1RegionSize() * 2 / 3;
/**
* Factory method
*
* @return weak/soft reference on byte array of ALLOCATION_SIZE
*/
public abstract Reference<byte[]> create();
}
private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
/**
* Does actual testing:
* Gets a reference
* Gets address of referenced object using WB method
* Calls gc of provided type
* Checks that object was/was not deleted using WB methods.
*/
public static void doTesting(GC gc, REF_FACTORY ref) {
System.out.println(String.format("Testing %s reference behavior after %s", ref.name(), gc.name()));
Reference reference = ref.create();
Asserts.assertNotNull(reference, "Test Bug: failed to allocate reference");
long adr = WHITE_BOX.getObjectAddress(reference.get());
//Sanity checks
boolean isRefNulled = (reference.get() == null);
boolean isRegionHumongous = WHITE_BOX.g1BelongsToHumongousRegion(adr);
boolean isRegionFree = WHITE_BOX.g1BelongsToFreeRegion(adr);
Asserts.assertEquals(isRefNulled, false,
"We just allocated an object but reference.get() already returned null");
Asserts.assertEquals(isRegionFree, false,
"We just allocated an object but WB returns that allocation region is still considered free");
Asserts.assertEquals(isRegionHumongous, true,
"We just allocated a humongous object but WB returns that allocation region is not humongous");
gc.provoke();
isRefNulled = (reference.get() == null);
isRegionHumongous = WHITE_BOX.g1BelongsToHumongousRegion(adr);
isRegionFree = WHITE_BOX.g1BelongsToFreeRegion(adr);
boolean isObjCollected = isRegionFree || !isRegionHumongous;
Asserts.assertEquals(isRefNulled, isObjCollected,
String.format("There is an inconsistensy between reference and white box "
+ "method behavior - one considers object referenced with "
+ "%s type collected and another doesn't!\n"
+ "\treference.get() returned %snull\n"
+ "\tWhiteBox methods returned that object was%s collected",
reference.getClass().getSimpleName(),
(isRefNulled ? "" : "not "),
(isObjCollected ? "" : " not")));
System.out.println("Passed");
}
/**
* Entry point
*
* @param args not used
*/
public static void main(String[] args) {
// Full gc - System.gc()
TestObjectCollected.doTesting(GC.FULL_GC, REF_FACTORY.WEAK);
TestObjectCollected.doTesting(GC.FULL_GC, REF_FACTORY.SOFT);
// Full gc with memory pressure - WB.fullGC() emulates that no memory left
TestObjectCollected.doTesting(GC.FULL_GC_MEMORY_PRESSURE, REF_FACTORY.WEAK);
TestObjectCollected.doTesting(GC.FULL_GC_MEMORY_PRESSURE, REF_FACTORY.SOFT);
// Young gc
TestObjectCollected.doTesting(GC.YOUNG_CG, REF_FACTORY.WEAK);
TestObjectCollected.doTesting(GC.YOUNG_CG, REF_FACTORY.SOFT);
// Concurrent mark cycle
TestObjectCollected.doTesting(GC.CMC, REF_FACTORY.WEAK);
TestObjectCollected.doTesting(GC.CMC, REF_FACTORY.SOFT);
}
}