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mminit.cpp
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/*******************************************************************************
* Copyright (c) 1991, 2021 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at https://www.eclipse.org/legal/epl-2.0/
* or the Apache License, Version 2.0 which accompanies this distribution and
* is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following
* Secondary Licenses when the conditions for such availability set
* forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
* General Public License, version 2 with the GNU Classpath
* Exception [1] and GNU General Public License, version 2 with the
* OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
/**
* @file
* @ingroup GC_Modron_Startup
*/
#if defined (J9VM_GC_VLHGC)
#include <math.h>
#endif /* J9VM_GC_VLHGC */
#include <string.h>
#include "gcmspace.h"
#include "gcutils.h"
#include "j2sever.h"
#include "j9.h"
#include "j9cfg.h"
#include "j9comp.h"
#include "j9consts.h"
#include "j9modron.h"
#include "j9port.h"
#include "j9protos.h"
#include "jni.h"
#include "jvminit.h"
#include "mminit.h"
#include "mminitcore.h"
#include "mmparse.h"
#include "modronnls.h"
#include "omr.h"
#if defined(J9VM_GC_MODRON_TRACE) && !defined(J9VM_GC_REALTIME)
#include "Tgc.hpp"
#endif /* J9VM_GC_MODRON_TRACE && !defined(J9VM_GC_REALTIME) */
#if defined (J9VM_GC_HEAP_CARD_TABLE)
#include "CardTable.hpp"
#endif /* defined (J9VM_GC_HEAP_CARD_TABLE) */
#include "CollectorLanguageInterfaceImpl.hpp"
#if defined(OMR_GC_MODRON_CONCURRENT_MARK)
#include "ConcurrentCardTable.hpp"
#include "ConcurrentGC.hpp"
#endif /* OMR_GC_MODRON_CONCURRENT_MARK */
#include "Configuration.hpp"
#if defined(J9VM_GC_MODRON_STANDARD)
#include "ConfigurationFlat.hpp"
#include "ConfigurationGenerational.hpp"
#endif /* J9VM_GC_MODRON_STANDARD */
#if defined(J9VM_GC_VLHGC)
#include "ConfigurationIncrementalGenerational.hpp"
#endif /* J9VM_GC_VLHGC */
#if defined(J9VM_GC_REALTIME)
#include "ConfigurationRealtime.hpp"
#endif /* J9VM_GC_REALTIME */
#include "ClassLoaderManager.hpp"
#include "Debug.hpp"
#include "EnvironmentBase.hpp"
#if defined(J9VM_GC_FINALIZATION)
#include "FinalizeListManager.hpp"
#endif /* J9VM_GC_FINALIZATION */
#include "GCExtensions.hpp"
#include "GlobalAllocationManager.hpp"
#include "GlobalCollector.hpp"
#include "HeapRegionDescriptor.hpp"
#include "HeapRegionManager.hpp"
#include "LargeObjectAllocateStats.hpp"
#include "Math.hpp"
#include "MemorySpace.hpp"
#include "MemorySubSpace.hpp"
#include "ModronAssertions.h"
#include "ObjectAccessBarrier.hpp"
#include "ObjectAllocationInterface.hpp"
#include "OMRVMInterface.hpp"
#include "OMRVMThreadInterface.hpp"
#include "ParallelDispatcher.hpp"
#if defined(J9VM_GC_VLHGC)
#include "RememberedSetCardList.hpp"
#endif /* J9VM_GC_VLHGC */
#if defined(J9VM_GC_SEGRGATED_HEAP)
#include "ObjectHeapIteratorSegregated.hpp"
#include "SizeClasses.hpp"
#endif /* J9VM_GC_SEGRGATED_HEAP */
#if defined(J9VM_GC_REALTIME)
#include "RememberedSetSATB.hpp"
#endif /* J9VM_GC_REALTIME */
#include "Scavenger.hpp"
#include "StringTable.hpp"
#include "Validator.hpp"
#if defined(OMR_GC_IDLE_HEAP_MANAGER)
#include "IdleGCManager.hpp"
#endif
/**
* If we fail to allocate heap structures with the default Xmx value,
* we will try again with a smaller value. These parameters define
* the percentage by which to reduce the Xmx value.
*/
#define DEFAULT_XMX_REDUCTION_NUMERATOR 4
#define DEFAULT_XMX_REDUCTION_DENOMINATOR 5
#define NONE ((UDATA) 0x0)
#define XMS ((UDATA) 0x1)
#define XMOS ((UDATA) 0x2)
#define XMNS ((UDATA) 0x4)
#define XMDX ((UDATA) 0x8)
#define XMS_XMOS ((UDATA) XMS | XMOS)
#define XMOS_XMNS ((UDATA) XMOS | XMNS)
#define XMDX_XMS ((UDATA) XMDX | XMS)
#define ROUND_TO(granularity, number) (((UDATA)(number) + (granularity) - 1) & ~((UDATA)(granularity) - 1))
extern "C" {
extern J9MemoryManagerFunctions MemoryManagerFunctions;
extern void initializeVerboseFunctionTableWithDummies(J9MemoryManagerVerboseInterface *table);
static void hookValidatorVMThreadCrash(J9HookInterface * * hookInterface, UDATA eventNum, void * eventData, void * userData);
static bool gcInitializeVMHooks(MM_GCExtensionsBase *extensions);
static void gcCleanupVMHooks(MM_GCExtensionsBase *extensions);
static const char * displayXmxOrMaxRAMPercentage(IDATA* memoryParameters);
static const char * displayXmsOrInitialRAMPercentage(IDATA* memoryParameters);
/**
* Initialize the threads mutator information (RS pointers, reference list pointers etc) for GC/MM purposes.
*
* @note vmThread MAY NOT be initialized completely from an execution model perspective.
* @return 0 if OK, or non 0 if error
*/
IDATA
initializeMutatorModelJava(J9VMThread* vmThread)
{
if (0 != initializeMutatorModel(vmThread->omrVMThread)) {
return -1;
}
MM_GCExtensions* extensions = MM_GCExtensions::getExtensions(vmThread);
vmThread->gcExtensions = vmThread->omrVMThread->_gcOmrVMThreadExtensions;
if (extensions->isStandardGC()) {
if (extensions->isConcurrentScavengerEnabled()) {
/* Ensure that newly created threads invoke VM access using slow path, so that the associated hook is invoked.
* GC will register to the hook to enable local thread resources if a thread happens to be created in a middle of Concurrent Scavenge */
setEventFlag(vmThread, J9_PUBLIC_FLAGS_DISABLE_INLINE_VM_ACCESS);
}
#if defined(J9VM_GC_GENERATIONAL)
vmThread->gcRememberedSet.fragmentCurrent = NULL;
vmThread->gcRememberedSet.fragmentTop = NULL;
vmThread->gcRememberedSet.fragmentSize = OMR_SCV_REMSET_FRAGMENT_SIZE;
#endif /* J9VM_GC_GENERATIONAL */
void *lowAddress = extensions->heapBaseForBarrierRange0;
void *highAddress = (void *)((UDATA)extensions->heapBaseForBarrierRange0 + extensions->heapSizeForBarrierRange0);
// todo: dagar lowTenureAddress, highTenureAddress, heapBaseForBarrierRange0, heapSizeForBarrierRange0 are duplicated
vmThread->lowTenureAddress = lowAddress;
vmThread->highTenureAddress = highAddress;
/* replacement values for lowTenureAddress and highTenureAddress */
// todo: dagar remove duplicate fields
vmThread->heapBaseForBarrierRange0 = extensions->heapBaseForBarrierRange0;
vmThread->heapSizeForBarrierRange0 = extensions->heapSizeForBarrierRange0;
#if defined (J9VM_GC_HEAP_CARD_TABLE)
if (NULL != extensions->cardTable) {
vmThread->activeCardTableBase = extensions->cardTable->getCardTableStart();
}
#endif /* J9VM_GC_HEAP_CARD_TABLE */
} else if(extensions->isVLHGC()) {
MM_Heap *heap = extensions->getHeap();
void *heapBase = heap->getHeapBase();
void *heapTop = heap->getHeapTop();
/* replacement values for lowTenureAddress and highTenureAddress */
vmThread->heapBaseForBarrierRange0 = heapBase;
vmThread->heapSizeForBarrierRange0 = (UDATA)heapTop - (UDATA)heapBase;
/* lowTenureAddress and highTenureAddress are actually supposed to be the low and high addresses of the heap for which card
* dirtying is required (the JIT uses this as a range check to determine if it needs to dirty a card when writing into an
* object). Setting these for Tarok is just a work-around until a more generic solution is implemented
*/
vmThread->lowTenureAddress = heapBase;
vmThread->highTenureAddress = heapTop;
#if defined (J9VM_GC_HEAP_CARD_TABLE)
vmThread->activeCardTableBase = extensions->cardTable->getCardTableStart();
#endif /* J9VM_GC_HEAP_CARD_TABLE */
}
return 0;
}
/**
* Cleanup Mutator specific resources (TLH, thread extension, etc) on shutdown.
*/
void
cleanupMutatorModelJava(J9VMThread* vmThread)
{
MM_EnvironmentBase *env = MM_EnvironmentBase::getEnvironment(vmThread->omrVMThread);
if (NULL != env) {
J9JavaVM *vm = vmThread->javaVM;
J9VMDllLoadInfo *loadInfo = getGCDllLoadInfo(vm);
/* cleanupMutatorModelJava is called as part of the main vmThread shutdown, which happens after
* gcCleanupHeapStructures has been called. We should therefore only flush allocation caches
* if there is still a heap.
*/
if (!IS_STAGE_COMPLETED(loadInfo->completedBits, HEAP_STRUCTURES_FREED)) {
/* this can only be called if the heap still exists since it will ask the TLH chunk to be abandoned with crashes if the heap is deallocated */
GC_OMRVMThreadInterface::flushCachesForGC(env);
}
}
cleanupMutatorModel(vmThread->omrVMThread, 0);
vmThread->gcExtensions = NULL;
}
/**
* Triggers hook for deleting private heap.
* @param memorySpace pointer to the list (pool) of memory spaces
*/
static void
reportPrivateHeapDelete(J9JavaVM * javaVM, void * memorySpace)
{
MM_EnvironmentBase env(javaVM->omrVM);
MM_MemorySpace *modronMemorySpace = (MM_MemorySpace *)memorySpace;
if (modronMemorySpace) {
if (!(javaVM->runtimeFlags & J9_RUNTIME_SHUTDOWN)) {
TRIGGER_J9HOOK_MM_PRIVATE_HEAP_DELETE(
MM_GCExtensions::getExtensions(javaVM)->privateHookInterface,
env.getOmrVMThread(),
modronMemorySpace);
}
}
}
/**
* Cleanup passive heap structures
*/
void
gcCleanupHeapStructures(J9JavaVM * vm)
{
/* If shutdown occurs early (due to command line parsing errors, for example) there may not be
* a J9VMThread, so allocate a fake environment.
*/
MM_EnvironmentBase env(vm->omrVM);
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(vm);
/* remove hooks installed by Validator */
gcCleanupVMHooks(extensions);
/* Flush any allocation contexts so that their memory is returned to the memory spaces before we tear down the memory spaces */
MM_GlobalAllocationManager *gam = extensions->globalAllocationManager;
if (NULL != gam) {
gam->flushAllocationContextsForShutdown(&env);
}
if (vm->memorySegments) {
vm->internalVMFunctions->freeMemorySegmentList(vm, vm->memorySegments);
}
if (vm->classMemorySegments) {
vm->internalVMFunctions->freeMemorySegmentList(vm, vm->classMemorySegments);
}
#if defined(J9VM_GC_FINALIZATION)
if (extensions->finalizeListManager) {
extensions->finalizeListManager->kill(&env);
extensions->finalizeListManager = NULL;
}
#endif /* J9VM_GC_FINALIZATION */
if (vm->mainThread && vm->mainThread->threadObject) {
/* main thread has not been deallocated yet, but heap has gone */
vm->mainThread->threadObject = NULL;
}
return;
}
/**
* Initialized passive and active heap components
*/
IDATA
j9gc_initialize_heap(J9JavaVM *vm, IDATA *memoryParameterTable, UDATA heapBytesRequested)
{
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(vm);
MM_EnvironmentBase env(vm->omrVM);
MM_GlobalCollector *globalCollector;
PORT_ACCESS_FROM_JAVAVM(vm);
J9VMDllLoadInfo *loadInfo = getGCDllLoadInfo(vm);
if (J9_ARE_ANY_BITS_SET(vm->extendedRuntimeFlags2, J9_EXTENDED_RUNTIME2_ENABLE_PORTABLE_SHARED_CACHE)) {
extensions->shouldForceLowMemoryHeapCeilingShiftIfPossible = true;
}
#if defined(J9VM_GC_BATCH_CLEAR_TLH)
/* Record batch clear state in VM so inline allocates can decide correct initialization procedure */
vm->initializeSlotsOnTLHAllocate = (extensions->batchClearTLH == 0) ? 1 : 0;
#endif /* J9VM_GC_BATCH_CLEAR_TLH */
extensions->heap = extensions->configuration->createHeap(&env, heapBytesRequested);
if (NULL == extensions->heap) {
const char *splitFailure = NULL;
/* If error reason was not explicitly set use general error message */
if(MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_NO_ERROR == extensions->heapInitializationFailureReason) {
extensions->heapInitializationFailureReason = MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_CAN_NOT_INSTANTIATE_HEAP;
}
switch(extensions->heapInitializationFailureReason) {
/* see if we set the split-heap specific error since we want to be more verbose in that case */
case MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_CAN_NOT_INSTANTIATE_SPLIT_HEAP_OLD_SPACE:
splitFailure = j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_ALLOCATE_OLD_SPACE, "Failed to allocate old space");
break;
case MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_CAN_NOT_INSTANTIATE_SPLIT_HEAP_NEW_SPACE:
splitFailure = j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_ALLOCATE_NEW_SPACE, "Failed to allocate new space");
break;
case MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_CAN_NOT_INSTANTIATE_SPLIT_HEAP_GEOMETRY:
splitFailure = j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_SPLIT_HEAP_ENTEXTS_WRONG_ORDER, "Required split heap memory geometry could not be allocated");
break;
/* failed an attempt to allocate low memory reserve */
case MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_CAN_NOT_ALLOCATE_LOW_MEMORY_RESERVE:
{
/* Obtain the qualified size (e.g. 2k) */
UDATA size = extensions->suballocatorInitialSize;
const char* qualifier = NULL;
qualifiedSize(&size, &qualifier);
char *format = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_INSTANTIATE_LOW_MEMORY_RESERVE_SIZE_REQUESTED, "Failed to instantiate compressed references metadata. %zu%s requested");
UDATA formatLength = strlen(format) + 32; /* 2^64 is 20 digits, so have a few extra */
loadInfo->fatalErrorStr = (char *)j9mem_allocate_memory(formatLength, OMRMEM_CATEGORY_MM);
if (loadInfo->fatalErrorStr) {
j9str_printf(PORTLIB, loadInfo->fatalErrorStr, formatLength, format, size, qualifier);
loadInfo->loadFlags |= FREE_ERROR_STRING; /* indicates that buffer should be freed later */
}
break;
}
/* general error message - can not instantiate heap */
case MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_CAN_NOT_INSTANTIATE_HEAP:
{
/* Obtain the qualified size (e.g. 2k) */
UDATA size = heapBytesRequested;
const char* qualifier = NULL;
qualifiedSize(&size, &qualifier);
char *format = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_INSTANTIATE_HEAP_SIZE_REQUESTED, "Failed to instantiate heap. %zu%s requested");
UDATA formatLength = strlen(format) + 32; /* 2^64 is 20 digits, so have a few extra */
loadInfo->fatalErrorStr = (char *)j9mem_allocate_memory(formatLength, OMRMEM_CATEGORY_MM);
if (loadInfo->fatalErrorStr) {
j9str_printf(PORTLIB, loadInfo->fatalErrorStr, formatLength, format, size, qualifier);
loadInfo->loadFlags |= FREE_ERROR_STRING; /* indicates that buffer should be freed later */
}
break;
}
/* general error message - can not instantiate heap */
case MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_CAN_NOT_SATISFY_REQUESTED_PAGE_SIZE:
{
/* Obtain the qualified size (e.g. 2k) */
UDATA heapSize = extensions->memoryMax;
const char* heapSizeQualifier = NULL;
qualifiedSize(&heapSize, &heapSizeQualifier);
UDATA pageSize = extensions->requestedPageSize;
const char* pageSizeQualifier = NULL;
qualifiedSize(&pageSize, &pageSizeQualifier);
char *format = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_OPTIONS_XLP_PAGE_NOT_AVAILABLE_STRICT, "Unable to satisfy heap size %zu%s with page size %zu%s. Heap size can be specified with -Xmx");
UDATA formatLength = strlen(format) + 32; /* 2^64 is 20 digits, so have a few extra */
loadInfo->fatalErrorStr = (char *)j9mem_allocate_memory(formatLength, OMRMEM_CATEGORY_MM);
if (loadInfo->fatalErrorStr) {
j9str_printf(PORTLIB, loadInfo->fatalErrorStr, formatLength, format, heapSize, heapSizeQualifier, pageSize, pageSizeQualifier);
loadInfo->loadFlags |= FREE_ERROR_STRING; /* indicates that buffer should be freed later */
}
extensions->largePageFailedToSatisfy = true;
break;
}
case MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_NO_ERROR:
case MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_METRONOME_DOES_NOT_SUPPORT_4BIT_SHIFT:
default:
Assert_MM_unreachable();
break;
}
/* Handle split heap failures cases */
if (NULL != splitFailure) {
const char *format = j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_INSTANTIATE_SPLIT_HEAP, "Failed to instantiate split heap: %s (new size %zu%s, old size %zu%s)");
UDATA oldSpaceSize = extensions->oldSpaceSize;
const char* oldQualifier = NULL;
qualifiedSize(&oldSpaceSize, &oldQualifier);
UDATA newSpaceSize = extensions->newSpaceSize;
const char* newQualifier = NULL;
qualifiedSize(&newSpaceSize, &newQualifier);
UDATA formatLength = j9str_printf(PORTLIB, NULL, 0, format, splitFailure, newSpaceSize, newQualifier, oldSpaceSize, oldQualifier);
loadInfo->fatalErrorStr = (char *)j9mem_allocate_memory(formatLength, OMRMEM_CATEGORY_MM);
if (loadInfo->fatalErrorStr) {
j9str_printf(PORTLIB, loadInfo->fatalErrorStr, formatLength, format, splitFailure, newSpaceSize, newQualifier, oldSpaceSize, oldQualifier);
loadInfo->loadFlags |= FREE_ERROR_STRING; /* indicates that buffer should be freed later */
}
}
/* failed to generate error string - use default */
if(NULL == loadInfo->fatalErrorStr) {
loadInfo->fatalErrorStr = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_INSTANTIATE_HEAP, "Failed to instantiate heap.");
}
goto error_no_memory;
}
extensions->dispatcher = extensions->configuration->createParallelDispatcher(&env, (omrsig_handler_fn)vm->internalVMFunctions->structuredSignalHandlerVM, vm, vm->defaultOSStackSize);
if (NULL == extensions->dispatcher) {
loadInfo->fatalErrorStr = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_INSTANTIATE_TASK_DISPATCHER, "Failed to instantiate task dispatcher.");
goto error_no_memory;
}
/* Initialize VM interface extensions */
GC_OMRVMInterface::initializeExtensions(extensions);
/* Initialize the global collector */
globalCollector = extensions->configuration->createGlobalCollector(&env);
if (NULL == globalCollector) {
if(MM_GCExtensionsBase::HEAP_INITIALIZATION_FAILURE_REASON_METRONOME_DOES_NOT_SUPPORT_4BIT_SHIFT == extensions->heapInitializationFailureReason) {
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_GC_OPTION_OVERFLOW, displayXmxOrMaxRAMPercentage(memoryParameterTable));
}
loadInfo->fatalErrorStr = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_INSTANTIATE_GLOBAL_GARBAGE_COLLECTOR, "Failed to instantiate global garbage collector.");
goto error_no_memory;
}
/* Mark this collector as a global collector so that we will check for excessive gc after it collects */
globalCollector->setGlobalCollector(true);
extensions->setGlobalCollector(globalCollector);
/* Create the environments pool */
extensions->environments = extensions->configuration->createEnvironmentPool(&env);
if (NULL == extensions->environments) {
goto error_no_memory;
}
extensions->classLoaderManager = MM_ClassLoaderManager::newInstance(&env, globalCollector);
if (NULL == extensions->classLoaderManager) {
goto error_no_memory;
}
extensions->stringTable = MM_StringTable::newInstance(&env, extensions->dispatcher->threadCountMaximum());
if (NULL == extensions->stringTable) {
goto error_no_memory;
}
/* Initialize statistic locks */
if (omrthread_monitor_init_with_name(&extensions->gcStatsMutex, 0, "MM_GCExtensions::gcStats")) {
loadInfo->fatalErrorStr = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_INITIALIZE_MUTEX, "Failed to initialize mutex for GC statistics.");
goto error_no_memory;
}
#if defined(OMR_GC_IDLE_HEAP_MANAGER)
if (extensions->gcOnIdle) {
/* Enable idle tuning only for gencon policy */
if (gc_policy_gencon == extensions->configurationOptions._gcPolicy) {
extensions->idleGCManager = MM_IdleGCManager::newInstance(&env);
if (NULL == extensions->idleGCManager) {
goto error_no_memory;
}
}
}
#endif
return JNI_OK;
error_no_memory:
return JNI_ENOMEM;
}
/**
* Creates and initialized VM owned structures related to the heap
* Calls low level heap initialization function
* @return J9VMDLLMAIN_OK or J9VMDLLMAIN_FAILED
*/
jint
gcInitializeHeapStructures(J9JavaVM *vm)
{
PORT_ACCESS_FROM_JAVAVM(vm);
MM_EnvironmentBase env(vm->omrVM);
MM_MemorySpace *defaultMemorySpace;
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(vm);
J9VMDllLoadInfo *loadInfo = getGCDllLoadInfo(vm);
/* For now, number of segments to default in pool */
if ((vm->memorySegments = vm->internalVMFunctions->allocateMemorySegmentList(vm, 10, OMRMEM_CATEGORY_VM)) == NULL) {
loadInfo->fatalErrorStr = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_ALLOCATE_VM_MEMORY_SEGMENTS, "Failed to allocate VM memory segments.");
goto error;
}
/* For now, number of segments to default in pool */
if ((vm->classMemorySegments = vm->internalVMFunctions->allocateMemorySegmentListWithFlags(vm, 10, MEMORY_SEGMENT_LIST_FLAG_SORT, J9MEM_CATEGORY_CLASSES)) == NULL) {
loadInfo->fatalErrorStr = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_ALLOCATE_VM_CLASS_MEMORY_SEGMENTS, "Failed to allocate VM class memory segments.");
goto error;
}
/* j9gc_initialize_heap is now called from gcInitializeDefaults */
/* Create and initialize the default memory space */
defaultMemorySpace = internalAllocateMemorySpaceWithMaximum(vm, extensions->initialMemorySize, extensions->minNewSpaceSize, extensions->newSpaceSize, extensions->maxNewSpaceSize, extensions->minOldSpaceSize, extensions->oldSpaceSize, extensions->maxOldSpaceSize, extensions->maxSizeDefaultMemorySpace, 0, MEMORY_TYPE_DISCARDABLE);
if (defaultMemorySpace == NULL) {
loadInfo->fatalErrorStr = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_ALLOCATE_DEFAULT_MEMORY_SPACE, "Failed to allocate default memory space.");
goto error;
}
extensions->configuration->defaultMemorySpaceAllocated(extensions, defaultMemorySpace);
#if defined(J9VM_GC_FINALIZATION)
if(!(extensions->finalizeListManager = GC_FinalizeListManager::newInstance(&env))) {
loadInfo->fatalErrorStr = (char *)j9nls_lookup_message(J9NLS_DO_NOT_PRINT_MESSAGE_TAG | J9NLS_DO_NOT_APPEND_NEWLINE, J9NLS_GC_FAILED_TO_INITIALIZE_FINALIZER_MANAGEMENT, "Failed to initialize finalizer management.");
goto error;
}
#endif /* J9VM_GC_FINALIZATION */
/* install hooks for the Validator */
if (!gcInitializeVMHooks(extensions)) {
goto error;
}
vm->defaultMemorySpace = defaultMemorySpace;
return J9VMDLLMAIN_OK;
error:
return J9VMDLLMAIN_FAILED;
}
/**
* Starts the Finalizer and the Heap management components
* @return 0 if OK, non zero if error
*/
int
gcStartupHeapManagement(J9JavaVM *javaVM)
{
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(javaVM);
int result = 0;
#if defined(J9VM_GC_FINALIZATION)
result = j9gc_finalizer_startup(javaVM);
if (JNI_OK != result) {
PORT_ACCESS_FROM_JAVAVM(javaVM);
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_GC_FAILED_TO_INITIALIZE_FINALIZE_SUPPORT);
return result;
}
#endif /* J9VM_GC_FINALIZATION */
/* Kickoff secondary initialization for the global collector */
if (!extensions->getGlobalCollector()->collectorStartup(extensions)) {
result = JNI_ENOMEM;
}
if (!extensions->dispatcher->startUpThreads()) {
extensions->dispatcher->shutDownThreads();
result = JNI_ENOMEM;
}
if (JNI_OK != result) {
PORT_ACCESS_FROM_JAVAVM(javaVM);
extensions->getGlobalCollector()->collectorShutdown(extensions);
j9nls_printf(PORTLIB, J9NLS_ERROR, J9NLS_GC_FAILED_TO_STARTUP_GARBAGE_COLLECTOR);
return result;
}
return result;
}
void j9gc_jvmPhaseChange(J9VMThread *currentThread, UDATA phase)
{
J9JavaVM *vm = currentThread->javaVM;
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(vm);
MM_EnvironmentBase env(currentThread->omrVMThread);
if (J9VM_PHASE_NOT_STARTUP == phase) {
if ((NULL != vm->sharedClassConfig) && extensions->useGCStartupHints) {
if (extensions->isStandardGC()) {
/* read old values from SC */
uintptr_t hintDefaultOld = 0;
uintptr_t hintTenureOld = 0;
vm->sharedClassConfig->findGCHints(currentThread, &hintDefaultOld, &hintTenureOld);
/* Nothing to do if read fails, we'll just assume the old values are 0 */
/* Get the current heap size values.
* Default/Tenure MemorySubSpace is of type Generic (which is MemoryPool owner, while the parents are of type Flat/SemiSpace).
* For SemiSpace the latter (parent) ones are what we want to deal with (expand), since it's what includes both Allocate And Survivor children.
* For Flat it would probably make no difference if we used parent or child, but let's be consistent and use parent, too.
*/
MM_MemorySubSpace *defaultMemorySubSpace = extensions->heap->getDefaultMemorySpace()->getDefaultMemorySubSpace()->getParent();
MM_MemorySubSpace *tenureMemorySubspace = extensions->heap->getDefaultMemorySpace()->getTenureMemorySubSpace()->getParent();
uintptr_t hintDefault = defaultMemorySubSpace->getActiveMemorySize();
uintptr_t hintTenure = 0;
/* Standard GCs always have Default MSS (which is equal to Tenure for flat heap configuration).
* So the simplest is always fetch Default, regardless if's generational haep configuration or not.
* We fetch Tenure only if only not equal to Default (which implies it's generational) */
if (defaultMemorySubSpace != tenureMemorySubspace) {
hintTenure = tenureMemorySubspace->getActiveMemorySize();
}
/* Gradually learn, by averaging new values with old values - it may take a few restarts before hint converge to stable values */
hintDefault = (uintptr_t)MM_Math::weightedAverage((float)hintDefaultOld, (float)hintDefault, (1.0f - extensions->heapSizeStartupHintWeightNewValue));
hintTenure = (uintptr_t)MM_Math::weightedAverage((float)hintTenureOld, (float)hintTenure, (1.0f - extensions->heapSizeStartupHintWeightNewValue));
vm->sharedClassConfig->storeGCHints(currentThread, hintDefault, hintTenure, true);
/* Nothing to do if store fails, storeGCHints already issues a trace point */
}
}
}
}
void
gcExpandHeapOnStartup(J9JavaVM *javaVM)
{
J9SharedClassConfig *sharedClassConfig = javaVM->sharedClassConfig;
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(javaVM);
J9VMThread *currentThread = javaVM->internalVMFunctions->currentVMThread(javaVM);
MM_EnvironmentBase env(currentThread->omrVMThread);
if ((NULL != sharedClassConfig) && extensions->useGCStartupHints) {
if (extensions->isStandardGC()) {
uintptr_t hintDefault = 0;
uintptr_t hintTenure = 0;
if (0 == sharedClassConfig->findGCHints(currentThread, &hintDefault, &hintTenure)) {
/* Default/Tenure MemorySubSpace is of type Generic (which is MemoryPool owner, while the parents are of type Flat/SemiSpace).
* For SemiSpace the latter (parent) ones are what we want to deal with (expand), since it's what includes both Allocate And Survivor children.
* For Flat it would probably make no difference if we used parent or child, but let's be consistent and use parent, too.
*/
MM_MemorySubSpace *defaultMemorySubSpace = extensions->heap->getDefaultMemorySpace()->getDefaultMemorySubSpace()->getParent();
MM_MemorySubSpace *tenureMemorySubspace = extensions->heap->getDefaultMemorySpace()->getTenureMemorySubSpace()->getParent();
/* Standard GCs always have Default MSS (which is equal to Tenure for flat heap configuration).
* So the simplest is always deal with Default, regardless if's generational heap configuration or not.
* We deal with Tenure only if only not equal to Default (which implies it's generational)
* We are a bit conservative and aim for slightly lower values that historically recorded by hints.
*/
uintptr_t hintDefaultAdjusted = (uintptr_t)(hintDefault * extensions->heapSizeStartupHintConservativeFactor);
uintptr_t defaultCurrent = defaultMemorySubSpace->getActiveMemorySize();
if (hintDefaultAdjusted > defaultCurrent) {
extensions->heap->getResizeStats()->setLastExpandReason(HINT_PREVIOUS_RUNS);
defaultMemorySubSpace->expand(&env, hintDefaultAdjusted - defaultCurrent);
}
if (defaultMemorySubSpace != tenureMemorySubspace) {
uintptr_t hintTenureAdjusted = (uintptr_t)(hintTenure * extensions->heapSizeStartupHintConservativeFactor);
uintptr_t tenureCurrent = tenureMemorySubspace->getActiveMemorySize();
if (hintTenureAdjusted > tenureCurrent) {
extensions->heap->getResizeStats()->setLastExpandReason(HINT_PREVIOUS_RUNS);
tenureMemorySubspace->expand(&env, hintTenureAdjusted - tenureCurrent);
}
}
}
/* Nothing to do if findGCHints failed. It already issues a trace point - no need to duplicate it here */
}
/* todo: Balanced GC */
}
}
/**
* Cleanup Finalizer and Heap components
*/
void
gcShutdownHeapManagement(J9JavaVM *javaVM)
{
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(javaVM);
MM_Collector *globalCollector = extensions->getGlobalCollector();
#if defined(J9VM_GC_FINALIZATION)
/* wait for finalizer shutdown */
j9gc_finalizer_shutdown(javaVM);
#endif /* J9VM_GC_FINALIZATION */
/* Kickoff shutdown of global collector */
if (NULL != globalCollector) {
globalCollector->collectorShutdown(extensions);
}
if (extensions->dispatcher) {
extensions->dispatcher->shutDownThreads();
}
}
/**
* Free any resources allocated by gcInitializeWithDefaultValues
*/
void
gcCleanupInitializeDefaults(OMR_VM* omrVM)
{
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(omrVM);
MM_EnvironmentBase env(omrVM);
J9JavaVM *vm = (J9JavaVM*) omrVM->_language_vm;
if (NULL == extensions) {
return;
}
if (vm->defaultMemorySpace) {
reportPrivateHeapDelete(vm, vm->defaultMemorySpace);
}
/* defaultMemorySpace is cleared as part of configuration tear down */
if (NULL != extensions->configuration) {
extensions->configuration->kill(&env);
}
extensions->kill(&env);
omrVM->_gcOmrVMExtensions = NULL;
((J9JavaVM*)omrVM->_language_vm)->gcExtensions = NULL;
}
static UDATA
normalizeParameter(UDATA parameter, UDATA numerator, UDATA denominator, UDATA max, UDATA min, UDATA roundTo)
{
UDATA value = (parameter / denominator) * numerator;
value = MM_Math::roundToCeiling(roundTo, value);
value = (value > max) ? max : value;
value = (value < min) ? min : value;
return value;
}
/**
* Calculate the memory parameter value.
* Calculate and store memory parameters in destinationStruct based on the data found in sourceStruct
* @param parameterInfo pointer to parameter info structure
* @param memoryParameters array of parameter values
*/
static void
gcCalculateAndStoreMemoryParameter(MM_GCExtensions *destinationStruct, MM_GCExtensions *sourceStruct, const J9GcMemoryParameter *parameterInfo, IDATA *memoryParameters)
{
if (-1 == memoryParameters[parameterInfo->optionName]) {
/* Only parameters not specified by the user may be massaged based on other values. */
destinationStruct->*(parameterInfo->fieldOffset) =
normalizeParameter(sourceStruct->*(parameterInfo->valueBaseOffset),
parameterInfo->scaleNumerator,
parameterInfo->scaleDenominator,
parameterInfo->valueMax,
parameterInfo->valueMin,
parameterInfo->valueRound);
}
}
/**
* Calculate memory parameter values.
* Only parameters not specified by the user may be massaged based on other values.
* @param memoryParameters array of parameter values
*/
static jint
gcInitializeCalculatedValues(J9JavaVM *javaVM, IDATA* memoryParameters)
{
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(javaVM);
jint result = JNI_OK;
/* Set initial Xms value: 8M
*
* Note: Will need to verify Xms/Xmos/Xmns fit in user provided values of Xmx.
* This used to be for free, calculations based on Xmx, now it is a manual check
* in setConfigurationSpecificMemoryParameters
*/
/* TODO aryoung: eventually segregated heaps will allow heap expansion, although metronome
* itself will still require a fully expanded heap on startup */
const bool shouldMaximizeInitialHeap = (extensions->isSegregatedHeap() || extensions->isMetronomeGC());
const UDATA initialXmsValueMax = shouldMaximizeInitialHeap ? J9_MEMORY_MAX : (8 * 1024 * 1024);
const UDATA initialXmsValueMin = shouldMaximizeInitialHeap ? UDATA_MAX : (8 * 1024 * 1024);
/**
* GC memory parameters to be store in GCExtensions
* opt_Xms will be set to initialXmsValue due to valueMax and valueMin being set
* opt_Xmns will be 50% of Xms
* opt_Xmos will be 50% of Xms
*
* Note: MM_GCExtensions::newSpaceSize should be set here based on opt_Xmns option
*/
const struct J9GcMemoryParameter GCExtensionsParameterTable [] = {
{ &MM_GCExtensions::initialMemorySize, opt_Xms, initialXmsValueMax, initialXmsValueMin, &MM_GCExtensions::maxSizeDefaultMemorySpace, 1, 1, extensions->regionSize },
{ &MM_GCExtensions::minNewSpaceSize, opt_Xmns, (UDATA)-1, 2*MINIMUM_NEW_SPACE_SIZE, &MM_GCExtensions::initialMemorySize, 1, 4, 2*extensions->regionSize },
{ &MM_GCExtensions::newSpaceSize, opt_Xmns, (UDATA)-1, 2*MINIMUM_NEW_SPACE_SIZE, &MM_GCExtensions::initialMemorySize, 1, 4, 2*extensions->regionSize },
{ &MM_GCExtensions::maxNewSpaceSize, opt_Xmnx, (UDATA)-1, 2*MINIMUM_NEW_SPACE_SIZE, &MM_GCExtensions::maxSizeDefaultMemorySpace, 1, 4, 2*extensions->regionSize },
{ &MM_GCExtensions::minOldSpaceSize, opt_Xmos, initialXmsValueMax, MINIMUM_OLD_SPACE_SIZE, &MM_GCExtensions::initialMemorySize, 3, 4, extensions->regionSize },
{ &MM_GCExtensions::oldSpaceSize, opt_Xmos, initialXmsValueMax, MINIMUM_OLD_SPACE_SIZE, &MM_GCExtensions::initialMemorySize, 3, 4, extensions->regionSize },
{ &MM_GCExtensions::maxOldSpaceSize, opt_Xmox, (UDATA)-1, MINIMUM_OLD_SPACE_SIZE, &MM_GCExtensions::maxSizeDefaultMemorySpace, 1, 1, extensions->regionSize },
{ &MM_GCExtensions::allocationIncrement, opt_Xmoi, J9_ALLOCATION_INCREMENT_MAX, J9_ALLOCATION_INCREMENT_MIN, &MM_GCExtensions::maxSizeDefaultMemorySpace, J9_ALLOCATION_INCREMENT_NUMERATOR, J9_ALLOCATION_INCREMENT_DENOMINATOR, extensions->regionSize },
{ &MM_GCExtensions::fixedAllocationIncrement, opt_none, J9_FIXED_SPACE_SIZE_MAX, J9_FIXED_SPACE_SIZE_MIN, &MM_GCExtensions::maxSizeDefaultMemorySpace, J9_FIXED_SPACE_SIZE_NUMERATOR, J9_FIXED_SPACE_SIZE_DENOMINATOR, extensions->regionSize },
};
const IDATA GCExtensionsParameterTableSize = (sizeof(GCExtensionsParameterTable) / sizeof(struct J9GcMemoryParameter));
IDATA tableIndex;
/* Set the values which live in the JavaVM since they can't use the common GCExtensions member pointer approach */
if (-1 == memoryParameters[opt_Xmca]) {
javaVM->ramClassAllocationIncrement = normalizeParameter(extensions->maxSizeDefaultMemorySpace, J9_RAM_CLASS_ALLOCATION_INCREMENT_NUMERATOR, J9_RAM_CLASS_ALLOCATION_INCREMENT_DENOMINATOR, J9_RAM_CLASS_ALLOCATION_INCREMENT_MAX, J9_RAM_CLASS_ALLOCATION_INCREMENT_MIN, J9_RAM_CLASS_ALLOCATION_INCREMENT_ROUND_TO);
}
if (-1 == memoryParameters[opt_Xmco]) {
javaVM->romClassAllocationIncrement = normalizeParameter(extensions->maxSizeDefaultMemorySpace, J9_ROM_CLASS_ALLOCATION_INCREMENT_NUMERATOR, J9_ROM_CLASS_ALLOCATION_INCREMENT_DENOMINATOR, J9_ROM_CLASS_ALLOCATION_INCREMENT_MAX, J9_ROM_CLASS_ALLOCATION_INCREMENT_MIN, J9_ROM_CLASS_ALLOCATION_INCREMENT_ROUND_TO);
}
/* Walk the dependency table fixing unspecified parameters to calculated defaults (mapping GCExtensions values to other GCExtensions values) */
for(tableIndex=0; tableIndex < GCExtensionsParameterTableSize; tableIndex++) {
gcCalculateAndStoreMemoryParameter(extensions, extensions, &(GCExtensionsParameterTable[tableIndex]), memoryParameters);
}
#if defined (J9VM_GC_VLHGC)
if (0 == extensions->tarokRememberedSetCardListSize) {
uintptr_t cardSize = MM_RememberedSetCard::cardSize(extensions->compressObjectReferences());
/* 4% of region size is allocated for region's RSCL memory */
extensions->tarokRememberedSetCardListSize = extensions->regionSize * 4 / 100 / cardSize;
}
if (0 == extensions->tarokRememberedSetCardListMaxSize) {
/* Individual RSCL can grow up to 8x of its memory size */
extensions->tarokRememberedSetCardListMaxSize = 8 * extensions->tarokRememberedSetCardListSize;
}
#endif /* defined (J9VM_GC_VLHGC) */
/* Number of GC threads must be initialized at this point */
Assert_MM_true(0 < extensions->gcThreadCount);
/* initialize the size of Local Object Buffer */
if (0 == extensions->objectListFragmentCount) {
extensions->objectListFragmentCount = (4 * extensions->gcThreadCount) + 4;
}
return result;
}
/**
* Verify memory parameters.
*
* Some configurations do not honour all memory parameters provided by the user. Set these
* parameters to default values and make it appear the user did not specify any values for these
* parameters. A routine that thus checks for user provided input will not validate these
* parameters. Routines that modify configuration specific parameters will need to ensure
* they do not modify these same parameters.
*
* For a flat configuration -Xmn is ignored:
* -Xmn/-Xmns are set to 0
* -Xmnx is set to -Xmx
* memoryParameters structure is modified to make it look like the user did not specify these values.
*
* @param memoryParameters array of parameter values
* @return JNI_OK on success, JNI_ERR on failure
*/
jint
setConfigurationSpecificMemoryParameters(J9JavaVM *javaVM, IDATA* memoryParameters, bool flatConfiguration)
{
MM_GCExtensions *extensions = MM_GCExtensions::getExtensions(javaVM);
bool opt_XmsSet = (-1 != memoryParameters[opt_Xms]);
bool opt_XmnsSet = (-1 != memoryParameters[opt_Xmns]);
bool opt_XmosSet = (-1 != memoryParameters[opt_Xmos]);
bool opt_XmnxSet = (-1 != memoryParameters[opt_Xmnx]);
if (flatConfiguration) {
/* Xmns = 0, override fact user may have provided a value */
extensions->minNewSpaceSize = 0;
extensions->newSpaceSize = 0;
extensions->maxNewSpaceSize = 0;
memoryParameters[opt_Xmns] = memoryParameters[opt_Xmnx] = memoryParameters[opt_Xmn] = -1;
extensions->absoluteMinimumOldSubSpaceSize = MINIMUM_VM_SIZE;
}
/* Emulation of sovereign behaviour results in Xmx, and Xms being hardcoded. If a value smaller than
* the hardcoded minimum for Xmx is supplied, and this value is less than the hardcoded value of Xms
* then Xms, Xmns and Xmos need to be re-calculated.
*/
/* If Xms was set by the user, then initial guesses for Xmos and Xmns will
* be used in final calculations of those values (i.e. the current values
* are good enough).
*/
if (!opt_XmsSet) {
if (extensions->initialMemorySize > extensions->maxSizeDefaultMemorySpace) {
extensions->initialMemorySize = extensions->maxSizeDefaultMemorySpace;
if (!opt_XmosSet) {
extensions->oldSpaceSize = MM_Math::roundToFloor(extensions->heapAlignment, extensions->initialMemorySize/2);
extensions->oldSpaceSize = MM_Math::roundToFloor(extensions->regionSize, extensions->oldSpaceSize);
extensions->oldSpaceSize = (extensions->oldSpaceSize >= extensions->absoluteMinimumOldSubSpaceSize) ? extensions->oldSpaceSize : extensions->absoluteMinimumOldSubSpaceSize;
extensions->minOldSpaceSize = extensions->oldSpaceSize;
}
if (!flatConfiguration) {
if (!opt_XmnsSet) {
extensions->newSpaceSize = MM_Math::roundToFloor(extensions->heapAlignment, extensions->initialMemorySize/2);
extensions->newSpaceSize = MM_Math::roundToFloor(extensions->regionSize, extensions->newSpaceSize);
extensions->newSpaceSize = (extensions->newSpaceSize >= (2*extensions->absoluteMinimumNewSubSpaceSize)) ? extensions->newSpaceSize : (2*extensions->absoluteMinimumNewSubSpaceSize);
extensions->minNewSpaceSize = extensions->newSpaceSize;
}
}
}
}
if (!flatConfiguration && !opt_XmnxSet) {
/* If Xmnx is not set by the user, limit it to the 1/4 of the maximum heap size */
extensions->maxNewSpaceSize = MM_Math::roundToFloor(extensions->heapAlignment * 2,extensions->memoryMax / 4);
extensions->maxNewSpaceSize = MM_Math::roundToFloor(extensions->regionSize * 2, extensions->maxNewSpaceSize);
}
return JNI_OK;
}
/**
* Verify memory parameters.
*
* Determine which memory parameter to display to the user in the event of an error.
* @param memoryParameters array of parameter values
* @return pointer to "-Xmx" or "-XX:MaxRAMPercentage"
*/
static const char *
displayXmxOrMaxRAMPercentage(IDATA* memoryParameters)
{
if ((-1 != memoryParameters[opt_maxRAMPercent])
&& (memoryParameters[opt_Xmx] == memoryParameters[opt_maxRAMPercent])
) {
return "-Xmx (as set by -XX:MaxRAMPercentage)";
} else {
return "-Xmx";
}
}
/**
* Verify memory parameters.
*
* Determine which memory parameter to display to the user in the event of an error.
* @param memoryParameters array of parameter values
* @return pointer to "-Xms" or "-XX:InitialRAMPercentage"
*/
static const char *
displayXmsOrInitialRAMPercentage(IDATA* memoryParameters)
{
if ((-1 != memoryParameters[opt_initialRAMPercent])
&& (memoryParameters[opt_Xms] == memoryParameters[opt_initialRAMPercent])
) {
return "-Xms (as set by -XX:InitialRAMPercentage)";
} else {
return "-Xms";
}
}
/**
* Verify memory parameters.
*
* Determine which memory parameter to display to the user in the event of an error.
* @param memoryParameters array of parameter values
* @return pointer to "-Xmn" or "-Xmns"
*/
const char *
displayXmnOrXmns(IDATA* memoryParameters)
{
return (memoryParameters[opt_Xmn] == memoryParameters[opt_Xmns]) ? "-Xmn" : "-Xmns";
}
/**
* Verify memory parameters.
*
* Determine which memory parameter to display to the user in the event of an error.
* @param memoryParameters array of parameter values
* @return pointer to "-Xmn" or "-Xmnx" *
*/
const char *
displayXmnOrXmnx(IDATA* memoryParameters)
{
return (memoryParameters[opt_Xmn] == memoryParameters[opt_Xmnx]) ? "-Xmn" : "-Xmnx";
}