Adding in jfr thread statistics event.

runtime/oti/j9consts.h

@@ -953,6 +953,7 @@ extern "C" {
 #define J9JFR_EVENT_TYPE_CLASS_LOADING_STATISTICS 7
 #define J9JFR_EVENT_TYPE_THREAD_CONTEXT_SWITCH_RATE 8
 #define J9JFR_EVENT_TYPE_THREAD_PARK 9
+#define J9JFR_EVENT_TYPE_THREAD_STATISTICS 10
 
 /* JFR thread states */
 

runtime/oti/j9nonbuilder.h

@@ -453,6 +453,14 @@ typedef struct J9JFRClassLoadingStatistics {
 	I_64 unloadedClassCount;
 } J9JFRClassLoadingStatistics;
 
+typedef struct J9JFRThreadStatistics {
+	J9JFR_EVENT_COMMON_FIELDS
+	U_32 activeThreadCount;
+	U_32 daemonThreadCount;
+	U_32 accumulatedThreadCount;
+	U_32 peakThreadCount;
+} J9JFRThreadStatistics;
+
 typedef struct J9JFRThreadContextSwitchRate {
 	J9JFR_EVENT_COMMON_FIELDS
 	float switchRate;
@@ -5873,6 +5881,8 @@ typedef struct J9JavaVM {
 	UDATA anonClassCount;
 	UDATA totalThreadCount;
 	UDATA daemonThreadCount;
+	UDATA accumulatedThreadCount;
+	UDATA peakThreadCount;
 	omrthread_t finalizeMainThread;
 	omrthread_monitor_t finalizeMainMonitor;
 	omrthread_monitor_t processReferenceMonitor; /* the monitor for synchronizing between reference process and j9gc_wait_for_reference_processing() (only for Java 9 and later) */

runtime/vm/JFRChunkWriter.cpp

@@ -911,4 +911,35 @@ VM_JFRChunkWriter::writeThreadContextSwitchRateEvent(void *anElement, void *user
 	_bufferWriter->writeLEB128PaddedU32(dataStart, (U_32)(_bufferWriter->getCursor() - dataStart));
 }
 
+void
+VM_JFRChunkWriter::writeThreadStatisticsEvent(void *anElement, void *userData)
+{
+	ThreadStatisticsEntry *entry = (ThreadStatisticsEntry *)anElement;
+	VM_BufferWriter *_bufferWriter = (VM_BufferWriter *)userData;
+
+	/* reserve event size */
+	U_8 *dataStart = _bufferWriter->getAndIncCursor(sizeof(U_32));
+
+	/* write event type */
+	_bufferWriter->writeLEB128(ThreadStatisticsID);
+
+	/* write start ticks */
+	_bufferWriter->writeLEB128(entry->ticks);
+
+	/* write active thread count */
+	_bufferWriter->writeLEB128(entry->activeThreadCount);
+
+	/* write daemon thread count */
+	_bufferWriter->writeLEB128(entry->daemonThreadCount);
+
+	/* write accumulated thread count */
+	_bufferWriter->writeLEB128(entry->accumulatedThreadCount);
+
+	/* write peak thread count */
+	_bufferWriter->writeLEB128(entry->peakThreadCount);
+
+	/* write size */
+	_bufferWriter->writeLEB128PaddedU32(dataStart, _bufferWriter->getCursor() - dataStart);
+}
+
 #endif /* defined(J9VM_OPT_JFR) */

runtime/vm/JFRChunkWriter.hpp

@@ -76,6 +76,7 @@ enum MetadataTypeID {
 	CPULoadID = 95,
 	ThreadCPULoadID = 96,
 	ThreadContextSwitchRateID = 97,
+	ThreadStatisticsID = 99,
 	ClassLoadingStatisticsID = 100,
 	PhysicalMemoryID = 108,
 	ExecutionSampleID = 109,
@@ -169,6 +170,7 @@ class VM_JFRChunkWriter {
 	static constexpr int INITIAL_ENVIRONMENT_VARIABLE_EVENT_SIZE = 6000;
 	static constexpr int CLASS_LOADING_STATISTICS_EVENT_SIZE = 5 * sizeof(I_64);
 	static constexpr int THREAD_CONTEXT_SWITCH_RATE_SIZE = sizeof(float) + (3 * sizeof(I_64));
+	static constexpr int THREAD_STATISTICS_EVENT_SIZE = (6 * sizeof(U_64)) + sizeof(U_32);
 
 	static constexpr int METADATA_ID = 1;
 
@@ -350,6 +352,8 @@ class VM_JFRChunkWriter {
 
 			pool_do(_constantPoolTypes.getThreadContextSwitchRateTable(), &writeThreadContextSwitchRateEvent, _bufferWriter);
 
+			pool_do(_constantPoolTypes.getThreadStatisticsTable(), &writeThreadStatisticsEvent, _bufferWriter);
+
 			/* Only write constant events in first chunk */
 			if (0 == _vm->jfrState.jfrChunkCount) {
 				writeJVMInformationEvent();
@@ -597,7 +601,6 @@ class VM_JFRChunkWriter {
 		_bufferWriter->writeLEB128PaddedU32(dataStart, _bufferWriter->getCursor() - dataStart);
 	}
 
-
 	static void
 	writeCPULoadEvent(void *anElement, void *userData)
 	{
@@ -726,6 +729,8 @@ class VM_JFRChunkWriter {
 
 	static void writeThreadContextSwitchRateEvent(void *anElement, void *userData);
 
+	static void writeThreadStatisticsEvent(void *anElement, void *userData);
+
 	UDATA
 	calculateRequiredBufferSize()
 	{
@@ -790,6 +795,8 @@ class VM_JFRChunkWriter {
 
 		requiredBufferSize += _constantPoolTypes.getThreadContextSwitchRateCount() * THREAD_CONTEXT_SWITCH_RATE_SIZE;
 
+		requiredBufferSize += (_constantPoolTypes.getThreadStatisticsCount() * THREAD_STATISTICS_EVENT_SIZE);
+
 		return requiredBufferSize;
 	}
 

runtime/vm/JFRConstantPoolTypes.cpp

@@ -1126,6 +1126,8 @@ VM_JFRConstantPoolTypes::addThreadParkEntry(J9JFRThreadParked* threadParkData)
 	entry->timeOut = threadParkData->timeOut;
 	entry->untilTime = threadParkData->untilTime;
 
+	_threadParkCount += 1;
+
 done:
 	return;
 }
@@ -1217,6 +1219,28 @@ VM_JFRConstantPoolTypes::addThreadContextSwitchRateEntry(J9JFRThreadContextSwitc
 	_threadContextSwitchRateCount += 1;
 }
 
+void
+VM_JFRConstantPoolTypes::addThreadStatisticsEntry(J9JFRThreadStatistics *threadStatisticsData)
+{
+	ThreadStatisticsEntry *entry = (ThreadStatisticsEntry *)pool_newElement(_threadStatisticsTable);
+
+	if (NULL == entry) {
+		_buildResult = OutOfMemory;
+		goto done;
+	}
+
+	entry->ticks = threadStatisticsData->startTicks;
+	entry->activeThreadCount = threadStatisticsData->activeThreadCount;
+	entry->daemonThreadCount = threadStatisticsData->daemonThreadCount;
+	entry->accumulatedThreadCount = threadStatisticsData->accumulatedThreadCount;
+	entry->peakThreadCount = threadStatisticsData->peakThreadCount;
+
+	_threadStatisticsCount += 1;
+
+done:
+	return;
+}
+
 void
 VM_JFRConstantPoolTypes::printTables()
 {

runtime/vm/JFRConstantPoolTypes.hpp

@@ -251,6 +251,14 @@ struct ThreadContextSwitchRateEntry {
 	float switchRate;
 };
 
+struct ThreadStatisticsEntry {
+	I_64 ticks;
+	U_32 activeThreadCount;
+	U_32 daemonThreadCount;
+	U_32 accumulatedThreadCount;
+	U_32 peakThreadCount;
+};
+
 struct JVMInformationEntry {
 	const char *jvmName;
 	const char *jvmVersion;
@@ -338,6 +346,8 @@ class VM_JFRConstantPoolTypes {
 	UDATA _classLoadingStatisticsCount;
 	J9Pool *_threadContextSwitchRateTable;
 	U_32 _threadContextSwitchRateCount;
+	J9Pool *_threadStatisticsTable;
+	UDATA _threadStatisticsCount;
 
 	/* Processing buffers */
 	StackFrame *_currentStackFrameBuffer;
@@ -611,6 +621,8 @@ class VM_JFRConstantPoolTypes {
 
 	void addThreadContextSwitchRateEntry(J9JFRThreadContextSwitchRate *threadContextSwitchRateData);
 
+	void addThreadStatisticsEntry(J9JFRThreadStatistics *threadStatisticsData);
+
 	J9Pool *getExecutionSampleTable()
 	{
 		return _executionSampleTable;
@@ -661,6 +673,11 @@ class VM_JFRConstantPoolTypes {
 		return _threadContextSwitchRateTable;
 	}
 
+	J9Pool *getThreadStatisticsTable()
+	{
+		return _threadStatisticsTable;
+	}
+
 	UDATA getExecutionSampleCount()
 	{
 		return _executionSampleCount;
@@ -711,6 +728,11 @@ class VM_JFRConstantPoolTypes {
 		return _threadContextSwitchRateCount;
 	}
 
+	UDATA getThreadStatisticsCount()
+	{
+		return _threadStatisticsCount;
+	}
+
 	ClassloaderEntry *getClassloaderEntry()
 	{
 		return _firstClassloaderEntry;
@@ -869,6 +891,9 @@ class VM_JFRConstantPoolTypes {
 			case J9JFR_EVENT_TYPE_THREAD_CONTEXT_SWITCH_RATE:
 				addThreadContextSwitchRateEntry((J9JFRThreadContextSwitchRate *)event);
 				break;
+			case J9JFR_EVENT_TYPE_THREAD_STATISTICS:
+				addThreadStatisticsEntry((J9JFRThreadStatistics *)event);
+				break;
 			default:
 				Assert_VM_unreachable();
 				break;
@@ -1201,6 +1226,8 @@ class VM_JFRConstantPoolTypes {
 		, _classLoadingStatisticsCount(0)
 		, _threadContextSwitchRateTable(NULL)
 		, _threadContextSwitchRateCount(0)
+		, _threadStatisticsTable(NULL)
+		, _threadStatisticsCount(0)
 		, _previousStackTraceEntry(NULL)
 		, _firstStackTraceEntry(NULL)
 		, _previousThreadEntry(NULL)
@@ -1333,6 +1360,12 @@ class VM_JFRConstantPoolTypes {
 			goto done;
 		}
 
+		_threadStatisticsTable = pool_new(sizeof(ThreadStatisticsEntry), 0, sizeof(U_64), 0, J9_GET_CALLSITE(), OMRMEM_CATEGORY_VM, POOL_FOR_PORT(privatePortLibrary));
+		if (NULL == _threadStatisticsTable ) {
+			_buildResult = OutOfMemory;
+			goto done;
+		}
+
 		/* Add reserved index for default entries. For strings zero is the empty or NUll string.
 		 * For package zero is the deafult package, for Module zero is the unnamed module. ThreadGroup
 		 * zero is NULL threadGroup.
@@ -1424,6 +1457,7 @@ class VM_JFRConstantPoolTypes {
 		pool_kill(_threadCPULoadTable);
 		pool_kill(_classLoadingStatisticsTable);
 		pool_kill(_threadContextSwitchRateTable);
+		pool_kill(_threadStatisticsTable);
 		j9mem_free_memory(_globalStringTable);
 	}
 

runtime/vm/jfr.cpp

@@ -103,6 +103,9 @@ jfrEventSize(J9JFREvent *jfrEvent)
 	case J9JFR_EVENT_TYPE_THREAD_CONTEXT_SWITCH_RATE:
 		size = sizeof(J9JFRThreadContextSwitchRate);
 		break;
+	case J9JFR_EVENT_TYPE_THREAD_STATISTICS:
+		size = sizeof(J9JFRThreadStatistics);
+		break;
 	default:
 		Assert_VM_unreachable();
 		break;
@@ -1078,6 +1081,23 @@ jfrThreadContextSwitchRate(J9VMThread *currentThread)
 	}
 }
 
+void
+jfrThreadStatistics(J9VMThread *currentThread)
+{
+	J9JavaVM *vm = currentThread->javaVM;
+	J9JFRThreadStatistics *jfrEvent = (J9JFRThreadStatistics *)reserveBuffer(currentThread, sizeof(J9JFRThreadStatistics));
+
+	if (NULL != jfrEvent) {
+		initializeEventFields(currentThread, (J9JFREvent *)jfrEvent, J9JFR_EVENT_TYPE_THREAD_STATISTICS);
+
+		jfrEvent->activeThreadCount = vm->totalThreadCount;
+		jfrEvent->daemonThreadCount = vm->daemonThreadCount;
+		jfrEvent->accumulatedThreadCount = vm->accumulatedThreadCount;
+		jfrEvent->peakThreadCount = vm->peakThreadCount;
+	}
+
+}
+
 static int J9THREAD_PROC
 jfrSamplingThreadProc(void *entryArg)
 {
@@ -1096,6 +1116,7 @@ jfrSamplingThreadProc(void *entryArg)
 				internalAcquireVMAccess(currentThread);
 				jfrCPULoad(currentThread);
 				jfrClassLoadingStatistics(currentThread);
+				jfrThreadStatistics(currentThread);
 				if (0 == (count % 1000)) { // 10 seconds
 					J9SignalAsyncEvent(vm, NULL, vm->jfrThreadCPULoadAsyncKey);
 					jfrThreadContextSwitchRate(currentThread);

runtime/vm/vmthread.cpp

@@ -348,6 +348,11 @@ allocateVMThread(J9JavaVM *vm, omrthread_t osThread, UDATA privateFlags, void *m
 	/* Update counters for total # of threads and daemon threads and notify anyone waiting */
 
 	++(vm->totalThreadCount);
+	++(vm->accumulatedThreadCount);
+	if (vm->totalThreadCount > vm->peakThreadCount) {
+		vm->peakThreadCount = vm->totalThreadCount;
+	}
+
 	if (privateFlags & J9_PRIVATE_FLAGS_DAEMON_THREAD) {
 		++(vm->daemonThreadCount);
 	}