Off heap #18163

LinHu2016 · 2023-09-19T18:12:18Z

Introduce Off-Heap Technology for Large Arrays in Balanced Region-Based Garbage Collector
carryforward from #14667

amicic · 2023-09-19T18:13:56Z

runtime/gc_base/IndexableObjectAllocationModel.cpp

@@ -26,11 +26,14 @@
 #include "Math.hpp"
 #include "MemorySpace.hpp"
 #if defined(J9VM_GC_ENABLE_DOUBLE_MAP)
+#include <sys/mman.h>
+#include <errno.h>


check if this is still needed

VermaSh · 2023-09-19T18:41:22Z

runtime/gc_modron_startup/mminit.cpp

@@ -2872,10 +2872,10 @@ gcInitializeDefaults(J9JavaVM* vm)
 	extensions->setOmrVM(vm->omrVM);
 	vm->omrVM->_gcOmrVMExtensions = (void *)extensions;
 	vm->gcExtensions = vm->omrVM->_gcOmrVMExtensions;
-#if defined(J9VM_ENV_DATA64)
+#if defined(J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION)
 	vm->isIndexableDualHeaderShapeEnabled = FALSE;


This should be true. It was toggle on a while back as part of Dual Header shape PR.

runtime/gc_base/IndexableObjectAllocationModel.cpp

amicic · 2023-09-19T19:20:39Z

runtime/gc_base/IndexableObjectAllocationModel.cpp

-#endif /* defined(J9VM_ENV_DATA64) */
+#endif /* defined(J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION) */
+			} else if (isAllIndexableDataContiguousEnabled) {
+#if defined(J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION)


we probably set this to NULL temporarily (rather than leaving it random), to avoid possible complication with GC occurring while this object is partially initialized

amicic · 2023-09-19T19:30:08Z

runtime/gc_base/IndexableObjectAllocationModel.cpp

 		break;

 	case GC_ArrayletObjectModel::Discontiguous:
 	case GC_ArrayletObjectModel::Hybrid:
 		if (NULL != spine) {
+			indexableObjectModel->setSizeInElementsForDiscontiguous(spine, _numberOfIndexedFields);


this might be redundant (set earlier for chunked array)?

runtime/gc_modron_startup/mmparseXXgc.cpp

amicic · 2023-09-20T17:49:35Z

runtime/gc_glue_java/ArrayletObjectModel.hpp

-		return (void *)((uintptr_t)arrayPtr + contiguousIndexableHeaderSize());
+		void *dataAddr = (void *)((uintptr_t)arrayPtr + contiguousIndexableHeaderSize());;
+#if defined(J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION)
+		if (isVirtualLargeObjectHeapEnabled()) {


it's probably more correct to do isDataAddressPresent check

disregard the comment - isVirtualLargeObjectHeapEnabled is more specific/deterministic (and consistent with what DDR does)

runtime/gc_base/IndexableObjectAllocationModel.cpp

amicic · 2023-09-20T18:15:19Z

runtime/gc_base/IndexableObjectAllocationModel.cpp

+		/* Free arraylet leaf addresses if dynamically allocated */
+		if (arrayletLeafCount > ARRAYLET_ALLOC_THRESHOLD) {
+			env->getForge()->free((void *)arrayletLeaveAddrs);
+		}


we might need a special state for this regions (different from just plain ARRAYLET), such as ARRAYLET_DECOMMITED or just DECOMMITED

runtime/gc_glue_java/ArrayletObjectModel.cpp

amicic · 2023-09-20T19:28:17Z

runtime/gc_glue_java/ArrayletObjectModel.cpp

+{
+	uintptr_t heapBase = (uintptr_t)extensions->heap->getHeapBase();
+	uintptr_t heapTop = (uintptr_t)extensions->heap->getHeapTop();
+	return ((uintptr_t)address >= heapBase) && ((uintptr_t)address < heapTop);


maybe this API exists or should be in extensions. does not look anything like array specific

amicic · 2023-09-20T19:34:26Z

runtime/gc_glue_java/ArrayletObjectModel.cpp

+#if defined(J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION)
+	void *dataAddr = getDataAddrForIndexableObject(arrayPtr);
+	bool isObjectWithinHeap = isAddressWithinHeap(extensions, dataAddr);
+	return ((getDataSizeInBytes(arrayPtr) >= _omrVM->_arrayletLeafSize) && (!isObjectWithinHeap));


the check in reality is toо generic for the very specific name
should we do a more double-map specific check or change the name to be more generic?

a more generic name would be isDataNonadjacentToHeader (picked to somewhat resembled the method above)

The difference between the 2 methods is that the above one consumes a size and is used during allocation/construction, while this method is used later (during GC or during verification) and consumes an already constructed/existing object.

We could name the methods the same name (sDataAdjacentToHeader) and let only the parameter distinguish them, but then the call sites for this one would have to be adjust to negate the result of the call.

dmitripivkine · 2023-09-26T18:01:12Z

runtime/gc_base/IndexableObjectAllocationModel.cpp

+		/* allocate the next arraylet leaf */
+		void *leaf = env->_objectAllocationInterface->allocateArrayletLeaf(env, &_allocateDescription,
+				_allocateDescription.getMemorySpace(), true);
+


Arraylet leaf is zeroed in the MM_AllocationContextBalanced::allocateArrayletLeaf(). This function is called from MM_TLHAllocationInterface::allocateArrayletLeaf() if Allocation Context is not NULL.
If I don't miss something we are zeroing leaf unnecessary.

perhaps the first step is to try to add an assert MM_AllocationContextBalanced::allocateArrayletLeaf() when we zero the memory that offheap allocation is enabled (it's still ok to zero it if double mapping is enabled)

runtime/gc_vlhgc/CopyForwardScheme.cpp

runtime/gc_vlhgc/WriteOnceCompactor.cpp

runtime/gc_base/RootScanner.cpp

runtime/gc_vlhgc/CopyForwardScheme.cpp

amicic · 2023-10-10T19:52:11Z

runtime/gc_base/RootScanner.cpp

+			if (region->isArrayletLeaf()) {
+				J9Object *spineObject = (J9Object *)region->_allocateData.getSpine();
+				Assert_MM_true(NULL != spineObject);
+				doObjectInVirtualLargeObjectHeap(spineObject);


we need to introduce a flag in region that we guarantie that we call this only once for each offheap object
doublemapping ensures this by setting arrayletDoublemapID->address only to first arraylet region

amicic · 2023-10-10T20:28:11Z

runtime/gc_vlhgc/VLHGCAccessBarrier.cpp

-
-				if (NULL == data) {
+				data = indexableObjectModel->getDataAddrForContiguous(arrayObject);
+				if ((NULL == data) || indexableObjectModel->isAddressWithinHeap(_extensions, data)) {
 					/* Doublemap failed, but we still need to continue execution; therefore fallback to previous approach */
 					copyArrayCritical(vmThread, indexableObjectModel, functions, &data, arrayObject, isCopy);


Seems like we will enter copy path for 0 sized arrays, what might work, but is suboptimal.
Also, it's not clear under what conditions dataAddr for discontiguous array will point within heap.

Add definitions for j9gc_off_heap_allocation_enabled and J9::ObjectModel::isOffHeapAllocationEnabled(). Adding these changes separate from eclipse-openj9#18163 to unblock JIT PR. Signed-off-by: midronij <[email protected]> Signed-off-by: Shubham Verma <[email protected]>

amicic · 2024-11-22T20:47:10Z

runtime/gc_vlhgc/VLHGCAccessBarrier.cpp

 		MM_JNICriticalRegion::enterCriticalRegion(vmThread, true);
 		Assert_MM_true(vmThread->publicFlags & J9_PUBLIC_FLAGS_VM_ACCESS);
-		arrayObject = (J9IndexableObject*)J9_JNI_UNWRAP_REFERENCE(array);
+		arrayObject = (J9IndexableObject *)J9_JNI_UNWRAP_REFERENCE(array);


this is overkill since we acquired VM access at the start of the method
(or we should acquire VM access selectively at later points)

amicic · 2024-11-22T21:00:03Z

runtime/gc_vlhgc/WriteOnceCompactor.cpp

 		}
-		/* if this is a contiguous array, we must have exhausted the iterator */
-		Assert_MM_true(NULL == it.nextSlot());
 	} else if (GC_ArrayletObjectModel::Discontiguous == layout) {
 		/* do nothing - no inline pointers */


we could assert is zero-sized array for offheap

amicic · 2024-11-22T21:06:51Z

runtime/gc_vlhgc/WriteOnceCompactor.cpp

@@ -1651,6 +1663,12 @@ class MM_WriteOnceCompactFixupRoots : public MM_RootScanner {
 		scanJVMTIObjectTagTables(env);
 #endif /* J9VM_OPT_JVMTI */

+#if defined(J9VM_GC_SPARSE_HEAP_ALLOCATION)
+	if (_includeVirtualLargeObjectHeap) {
+		scanObjectsInVirtualLargeObjectHeap(env);


why don't we override doObjectInVirtualLargeObjectHeap for WOC? seems like we should update offheap (dataAddr->spine) mapping when spine moved

amicic · 2024-11-23T05:20:47Z

runtime/gc_vlhgc/WriteOnceCompactor.cpp

@@ -1676,6 +1694,21 @@ class MM_WriteOnceCompactFixupRoots : public MM_RootScanner {
 		Assert_MM_unreachable();
 	}

+#if defined(J9VM_GC_SPARSE_HEAP_ALLOCATION)
+	virtual void doObjectInVirtualLargeObjectHeap(J9Object *objectPtr, bool *sparseHeapAllocation) {
+		J9Object *forwarded = (J9IndexableObject *)getForwardingPtr(objectPtr);


getForwardedPtr is WOC Api - should do _compactScheme->getForwardingPtr

forwarded object could/should be of type IndexableObject

amicic · 2024-11-23T05:25:16Z

runtime/gc_vlhgc/WriteOnceCompactor.cpp

+#if defined(J9VM_GC_SPARSE_HEAP_ALLOCATION)
+	virtual void doObjectInVirtualLargeObjectHeap(J9Object *objectPtr, bool *sparseHeapAllocation) {
+		J9Object *forwarded = (J9IndexableObject *)getForwardingPtr(objectPtr);
+		if ((NULL != forwarded) && (objectPtr != forwarded)) {


Don't see how it can be NULL - we can try to assert it.

use some more common name like fwdObjectPtr

amicic · 2024-11-23T05:26:23Z

runtime/gc_vlhgc/WriteOnceCompactor.cpp

@@ -1676,6 +1694,21 @@ class MM_WriteOnceCompactFixupRoots : public MM_RootScanner {
 		Assert_MM_unreachable();
 	}

+#if defined(J9VM_GC_SPARSE_HEAP_ALLOCATION)
+	virtual void doObjectInVirtualLargeObjectHeap(J9Object *objectPtr, bool *sparseHeapAllocation) {
+		J9Object *forwarded = (J9IndexableObject *)getForwardingPtr(objectPtr);


forwarded object could/should be of type IndexableObject

amicic · 2024-11-25T15:48:31Z

jenkins test sanity,extended all jdk21

amicic · 2024-11-25T16:18:51Z

runtime/gc_vlhgc/WriteOnceCompactor.cpp

@@ -1676,6 +1697,21 @@ class MM_WriteOnceCompactFixupRoots : public MM_RootScanner {
 		Assert_MM_unreachable();
 	}

+#if defined(J9VM_GC_SPARSE_HEAP_ALLOCATION)
+	virtual void doObjectInVirtualLargeObjectHeap(J9Object *objectPtr, bool *sparseHeapAllocation) {


this method could pass J9IndexableObject, but we can do that cleanup later

amicic · 2024-11-25T16:19:08Z

jenkins test sanity,extended all jdk21

amicic · 2024-11-25T17:12:25Z

jenkins test sanity.system,extended.system all jdk21

amicic · 2024-11-25T18:01:05Z

jenkins test sanity.system,extended.system xmac jdk21

amicic · 2024-12-03T15:47:45Z

runtime/j9vm/j8vmi.c

 	}
 	if (NULL != dstObj) {
 		dstBytes = (*env)->GetPrimitiveArrayCritical(env, dstObj, NULL);
 		dstAddr = dstBytes;
 		/* The java caller has added Unsafe.arrayBaseOffset() to the offset. Remove it
 		 * here as GetPrimitiveArrayCritical returns a pointer to the first element.
 		 */
-		dstOffset -= J9VMTHREAD_CONTIGUOUS_INDEXABLE_HEADER_SIZE((J9VMThread*)env);
+		dstOffset -= J9VMTHREAD_UNSAFE_INDEXABLE_HEADER_SIZE((J9VMThread*)env);


we should put this as a separate fix

Remove this file from the changes (although it does not seem to cause conflicts since the changes are identical).
After that squash all the commits.

amicic · 2024-12-03T15:49:16Z

runtime/gc_vlhgc/WriteOnceCompactor.cpp

-							slotObject.writeReferenceToSlot(forwardedPtr);
-							_interRegionRememberedSet->rememberReferenceForCompact(env, spineObject, forwardedPtr);
+		if (region->_compactData._shouldFixup) {
+			/* This fixing up is specific for hybrid arraylets, for off-heap array the fix-up has been done for contiguous array pass.


You can simplify this comment. This is enough:

For off-heap/non-adjacent arrays, the fix up is done when any other contiguous/adjacent array is fixed up.

amicic · 2024-12-03T21:14:44Z

jenkins test sanity,extended all jdk21

amicic · 2024-12-04T18:35:44Z

jenkins test sanity,extended all jdk21

amicic · 2024-12-04T19:17:22Z

jenkins test sanity,extended aix jdk8

2, Introduce Off-Heap Technology for Large Arrays Introduce an optimized memory management for large arrays in a region-based garbage collector. More specifically, this is a new heap scheme and large object organization (in-heap and off-heap), an enhanced method for allocating large objects (proxy objects), and an optimized technique of accessing large arrays during runtime (JIT optimizations). 3, Updated PR Changes 4, enable xint by default 5, remove unneeded changes 6, updated changes 7, more updated changes old update 1 Fix build flag related issues on Java 8 -Fix incomplete issue to replace J9VM_ENV_DATA64 with J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION -Add/Enable buildflag gc_enableSparseHeapAllocation for J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION in axxon Java28 build -update getDataPointerForContiguous() to handle VirtualLargeObjectHeapEnabled case 2, Free the sparse region only once for all reserved leaf regions - new bool field _sparseHeapAllocation in MM_HeapRegionDescriptorVLHGC for identiying the first leaf region reserved for sparse heap allocation (default = false). - set the first leaf region reserved for sparse heap allocation = true during getSparseAddressAndDecommitLeaves(). - doObjectInVirtualLargeObjectHeap only once (for the first reserved leaf region) in MM_RootScanner::scanObjectsInVirtualLargeObjectHeap() 3, new Update from code reviewing Fix retrieving pontential stale pointer in jniGetPrimitiveArrayCritical Update to retrieve arrayObject after enterCriticalRegion() to avoid copy/move collection happen just before enterCriticalRegion() (enterCriticalRegion() would prevent copy/move collection before exitCriticalRegion()), the copy/move collection might move the arrayObject. then cause jniGetPrimitiveArrayCritical return stale data pointer. -replace isAddressWithinHeap() with (NULL != regionManager->regionDescriptorForAddress()). 4, Update macros rJ9JAVAARRAYCONTIGUOUS_EA Update Macro J9JAVAARRAYCONTIGUOUS_EA and J9JAVAARRAYCONTIGUOUS_EA_VM to also check isVirtualLargeObjectHeapEnabled if isIndexableDataAddrPresent == true to handle VirtualLargeObjectHeapDisabled case in Balanced GC( release JIT to initialize IndexableDataAddr for VirtualLargeObjectHeapDisabled case). Limitation: ArrayletDoubleMapping would not work properly. - new boolean isVirtualLargeObjectHeapEnabled in J9JavaVM - new boolean isVirtualLargeObjectHeapEnabled in J9VMThread 5, Detect offheap option for unsafe header reset vm.unsafeIndexableHeaderSize and vm.isVirtualLargeObjectHeapEnabled for off-heap case. 6, remove double mapping 7, DDR fixes and fix the issue in jniReleasePrimitiveArrayCritical (for zero size array, do not copyBackArrayCritical(), because doesn't copyArrayCritical() in jniGetPrimitiveArrayCritical() for removing double-mapping change). 8, Update from code review 9, DDR Changes for Off-Heap his change would not have any dependance on off-heap runtime changes, and should handle old core file(before any off-heap changes introduced), intermediate core file(XXgc:disableIndexableDualHeaderShape) and new core file(XXgc:enableVirtualLargeObjectHeap or XXgc:disableVirtualLargeObjectHeap) smoothly. use gcExtensions.isVirtualLargeObjectHeapEnabled for identifying if off heap is enabled or not. verify the DataAddr via hasCorrectDataAddrPointer() if isVirtualLargeObjectHeapEnabled. use javaVM.isIndexableDataAddrPresent for identifying if there is extra DataAddr field in the header of IndexableObject. output DataAddr after size for IndexableObject if isIndexableDataAddrPresent. handle new structures J9IndexableObjectWithDataAddressContiguous/Discontiguous use arrayletObjectModel->_arrayletRangeBase/ _arrayletRangeTop to verify if the address in heap. 10, code review update 11, update 2 for code review 12, Cmake update for off-heap new define J9VM_GC_SPARSE_HEAP_ALLOCATION for cmake build 13, Update Java8 build specs for off-heap new define J9VM_GC_SPARSE_HEAP_ALLOCATION for the build specs 14, J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION --> J9VM_GC_SPARSE_HEAP_ALLOCATION 15, compiler update J9VM_GC_ENABLE_SPARSE_HEAP_ALLOCATION --> J9VM_GC_SPARSE_HEAP_ALLOCATION 16, rollback 17, j9gc_objaccess_arrayObjectDataDisplacement 18, remove "--enable-OMR_GC_SPARSE_HEAP_ALLOCATION" in mk files 19, replace with <#if uma.spec.flags.gc_sparseHeapAllocation.enabled> --enable-OMR_GC_SPARSE_HEAP_ALLOCATION \ </#if> in configure_common.mk.ftl 20, J9JAVAARRAYCONTIGUOUS_WITHOUT_DATAADDRESS_EA to J9JAVAARRAYCONTIGUOUS_BASE_EA_VM 21, remove unrelated changes 22, update for match PR20648 (Extract copy/free arrayCritical code from StandardAccessBarrier) 23, updateSparseDataEntryAfterObjectHasMoved in WriteOnceCompactFixupRoots 24, Update fixupArrayletLeafRegionContentsAndObjectLists - This fixing up is specific for hybrid arraylets, for off-heap array the fix-up has been done for contiguous array pass. So we should skip it for offheap enabled. It's a correctness problem, since we might be finding garbage references to scan. Additionally, because the leaf regions are supposed to be left decommited till the array dies, we are recommiting them too early. 25, fix JVM_CopySwapMemory crash issue for off-heap The java caller has added Unsafe.arrayBaseOffset() to the offset. need to remove it as GetPrimitiveArrayCritical returns a pointer to the first element, need to replace J9VMTHREAD_CONTIGUOUS_INDEXABLE_HEADER_SIZE() with J9VMTHREAD_UNSAFE_INDEXABLE_HEADER_SIZE() for off-heap case. 26, Rollback JVM_CopySwapMemory changes Change-Id: I2597c71ccf4c5fcc0f3aa3aea9f793e783a0a304 Signed-off-by: lhu <[email protected]>

amicic · 2024-12-05T15:52:43Z

Last commit was just a squash so we lost the references to jenkins builds, but they were stable other than a couple infra problems.

amicic reviewed Sep 19, 2023

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LinHu2016 force-pushed the off-heap branch 4 times, most recently from c15b61f to b818ba6 Compare September 23, 2023 16:07

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LinHu2016 force-pushed the off-heap branch 2 times, most recently from 1398a78 to 30ed6ce Compare October 3, 2023 14:57

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LinHu2016 force-pushed the off-heap branch from 30ed6ce to 5047af8 Compare October 13, 2023 16:50

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LinHu2016 force-pushed the off-heap branch 4 times, most recently from 7493ac3 to e5df160 Compare November 25, 2024 15:44

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amicic approved these changes Nov 26, 2024

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LinHu2016 mentioned this pull request Dec 2, 2024

Add new test modes for J9vmTest #20727

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LinHu2016 force-pushed the off-heap branch from e582543 to fe72b89 Compare December 3, 2024 14:44

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LinHu2016 force-pushed the off-heap branch from 80b9fbc to 6eef734 Compare December 4, 2024 17:57

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LinHu2016 force-pushed the off-heap branch from 6eef734 to 7c2a572 Compare December 5, 2024 15:22

amicic merged commit d1a8805 into eclipse-openj9:master Dec 5, 2024
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Off heap #18163

Off heap #18163

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