Get the process start time

Get the process start time on linux, windows, osx, aix and
z/os.

Issue: eclipse#7201
Signed-off-by: Amarpreet Singh <Amarpreet.A.Singh@ibm.com>

fvtest/porttest/si.cpp

@@ -52,6 +52,12 @@
 #endif /* defined(J9ZOS390) */
 #include <sys/resource.h> /* For RLIM_INFINITY */
 #endif /* !defined(OMR_OS_WINDOWS) */
+#if defined(OMR_OS_WINDOWS)
+#include <windows.h>
+#else /* defined(OMR_OS_WINDOWS) */
+#include <sys/wait.h>
+#include <unistd.h>
+#endif /* defined(OMR_OS_WINDOWS) */
 
 #if defined(J9ZOS390) && !defined(OMR_EBCDIC)
 #include "atoe.h"
@@ -3119,3 +3125,71 @@ TEST(PortSysinfoTest, GetProcessorDescription)
 		ASSERT_TRUE(feature == TRUE || feature == FALSE);
 	}
 }
+
+/* The method omrsysinfo_get_process_start_time is not implemented on z/TPF. */
+#if !defined(OMRZTPF)
+/**
+ * Test: GetProcessorStartTimeOfNonExistingProcessTest.
+ * Description: Verify that getting the process start time for a non-existing process (UINTPTR_MAX) results in 0 nanoseconds.
+ * Passing Condition: The expected process start time is 0 nanoseconds, and the actual process start time matches this value.
+ */
+TEST(PortSysinfoTest, GetProcessorStartTimeOfNonExistingProcessTest)
+{
+	OMRPORT_ACCESS_FROM_OMRPORT(portTestEnv->getPortLibrary());
+	/*
+	 * If a pid of UINTPTR_MAX exists in the future then the test will need to be modified.
+	 * UINTPTR_MAX represents the maximum unsigned integer value, which can be a 32-bit or a 64-bit depending on the system.
+	 * On unix systems, a pid is represented by pid_t, which can be a 32-bit or a 64-bit signed integer.
+	 * On windows systems, a pid is represented by DWORD, which is a 32-bit unsigned integer, and
+	 * the maximum value of DWORD is not a valid pid as it is reserved for use by the ASFW_ANY parameter.
+	 */
+	uintptr_t pid = UINTPTR_MAX;
+	uint64_t expectedProcessStartTimeInNanoseconds = 0;
+	uint64_t actualProcessStartTimeInNanoseconds = omrsysinfo_get_process_start_time(pid);
+	ASSERT_EQ(expectedProcessStartTimeInNanoseconds, actualProcessStartTimeInNanoseconds);
+}
+
+/**
+ * Test: GetProcessorStartTimeOfExistingProcessTest.
+ * Description: Verify that getting the process start time for an existing process results in a valid timestamp.
+ * Passing Condition: The process start time is greater than the test start time and less than the current time at the end of the test.
+ */
+TEST(PortSysinfoTest, GetProcessorStartTimeOfExistingProcessTest)
+{
+	OMRPORT_ACCESS_FROM_OMRPORT(portTestEnv->getPortLibrary());
+	uintptr_t pid = UINTPTR_MAX;
+	uintptr_t success = 0;
+	uint64_t testStartTimeInNanoseconds = omrtime_current_time_nanos(&success);
+	uint64_t processStartTimeInNanoseconds = 0;
+#if defined(LINUX) || defined(OSX) || defined(AIXPPC) || defined(J9ZOS390)
+	int status = 0;
+	sleep(3);
+	pid = fork();
+	ASSERT_NE(pid, -1);
+	/* The if block will only be invoked by the child process. */
+	if (0 == pid) {
+		sleep(10);
+		/* A call to exit allows the child process to stop and avoids a timeout on x86-64 macOS. */
+		exit(0);
+	}
+	processStartTimeInNanoseconds = omrsysinfo_get_process_start_time(pid);
+	waitpid(pid, &status, 0);
+#elif defined(OMR_OS_WINDOWS) /* defined(LINUX) || defined(OSX) || defined(AIXPPC) || defined(J9ZOS390) */
+	STARTUPINFO si;
+	PROCESS_INFORMATION pi;
+	BOOL ret = FALSE;
+	ZeroMemory(&si, sizeof(si));
+	si.cb = sizeof(si);
+	ZeroMemory(&pi, sizeof(pi));
+	ret = CreateProcess(NULL, "cmd.exe /c timeout /t 10", NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
+	ASSERT_EQ(ret, TRUE);
+	pid = (uintptr_t)GetProcessId(pi.hProcess);
+	processStartTimeInNanoseconds = omrsysinfo_get_process_start_time(pid);
+	WaitForSingleObject(pi.hProcess, INFINITE);
+	CloseHandle(pi.hProcess);
+	CloseHandle(pi.hThread);
+#endif /* defined(LINUX) || defined(OSX) || defined(AIXPPC) || defined(J9ZOS390) */
+	ASSERT_GT(processStartTimeInNanoseconds, testStartTimeInNanoseconds);
+	ASSERT_LT(processStartTimeInNanoseconds, omrtime_current_time_nanos(&success));
+}
+#endif /* !defined(OMRZTPF) */

include_core/omrport.h

@@ -2459,6 +2459,8 @@ typedef struct OMRPortLibrary {
 	int32_t (*sysinfo_cgroup_subsystem_iterator_next)(struct OMRPortLibrary *portLibrary, struct OMRCgroupMetricIteratorState *state, struct OMRCgroupMetricElement *metricElement);
 	/** see @ref omrsysinfo.c::omrsysinfo_cgroup_subsystem_iterator_destroy "omrsysinfo_cgroup_subsystem_iterator_destroy"*/
 	void (*sysinfo_cgroup_subsystem_iterator_destroy)(struct OMRPortLibrary *portLibrary, struct OMRCgroupMetricIteratorState *state);
+	/** see @ref omrsysinfo.c::omrsysinfo_get_process_start_time "omrsysinfo_get_process_start_time"*/
+	uint64_t (*sysinfo_get_process_start_time)(struct OMRPortLibrary *portLibrary, uintptr_t pid);
 	/** see @ref omrport.c::omrport_init_library "omrport_init_library"*/
 	int32_t (*port_init_library)(struct OMRPortLibrary *portLibrary, uintptr_t size) ;
 	/** see @ref omrport.c::omrport_startup_library "omrport_startup_library"*/
@@ -3102,6 +3104,7 @@ extern J9_CFUNC int32_t omrport_getVersion(struct OMRPortLibrary *portLibrary);
 #define omrsysinfo_cgroup_subsystem_iterator_metricKey(param1, param2) privateOmrPortLibrary->sysinfo_cgroup_subsystem_iterator_metricKey(privateOmrPortLibrary, param1, param2)
 #define omrsysinfo_cgroup_subsystem_iterator_next(param1, param2) privateOmrPortLibrary->sysinfo_cgroup_subsystem_iterator_next(privateOmrPortLibrary, param1, param2)
 #define omrsysinfo_cgroup_subsystem_iterator_destroy(param1) privateOmrPortLibrary->sysinfo_cgroup_subsystem_iterator_destroy(privateOmrPortLibrary, param1)
+#define omrsysinfo_get_process_start_time(param1) privateOmrPortLibrary->sysinfo_get_process_start_time(privateOmrPortLibrary, param1)
 #define omrintrospect_startup() privateOmrPortLibrary->introspect_startup(privateOmrPortLibrary)
 #define omrintrospect_shutdown() privateOmrPortLibrary->introspect_shutdown(privateOmrPortLibrary)
 #define omrintrospect_set_suspend_signal_offset(param1) privateOmrPortLibrary->introspect_set_suspend_signal_offset(privateOmrPortLibrary, param1)

nls/portnls.h

@@ -176,5 +176,8 @@
 #define J9NLS_PORT_RUNNING_IN_CONTAINER_FAILURE__MODULE 0x504f5254
 #define J9NLS_PORT_RUNNING_IN_CONTAINER_FAILURE__ID 50
 #define J9NLS_PORT_RUNNING_IN_CONTAINER_FAILURE J9NLS_PORT_RUNNING_IN_CONTAINER_FAILURE__MODULE, J9NLS_PORT_RUNNING_IN_CONTAINER_FAILURE__ID
+#define J9NLS_PORT_SYSINFO_UNSUPPORTED_PLATFORM_ERROR__MODULE 0x504f5254
+#define J9NLS_PORT_SYSINFO_UNSUPPORTED_PLATFORM_ERROR__ID 51
+#define J9NLS_PORT_SYSINFO_UNSUPPORTED_PLATFORM_ERROR J9NLS_PORT_SYSINFO_UNSUPPORTED_PLATFORM_ERROR__MODULE, J9NLS_PORT_SYSINFO_UNSUPPORTED_PLATFORM_ERROR__ID
 
 #endif

port/common/omrport.c

@@ -335,6 +335,7 @@ static OMRPortLibrary MainPortLibraryTable = {
 	omrsysinfo_cgroup_subsystem_iterator_metricKey, /* sysinfo_cgroup_subsystem_iterator_metricKey */
 	omrsysinfo_cgroup_subsystem_iterator_next, /* sysinfo_cgroup_subsystem_iterator_next */
 	omrsysinfo_cgroup_subsystem_iterator_destroy, /* sysinfo_cgroup_subsystem_iterator_destroy */
+	omrsysinfo_get_process_start_time, /* sysinfo_get_process_start_time */
 	omrport_init_library, /* port_init_library */
 	omrport_startup_library, /* port_startup_library */
 	omrport_create_library, /* port_create_library */

port/common/omrport.tdf

@@ -1630,3 +1630,13 @@ TraceEvent=Trc_PRT_sl_open_shared_library_noload Group=sl Overhead=1 Level=3 NoE
 TraceException=Trc_PRT_retrieveLinuxMemoryStats_failedOpeningSwappinessFs Group=sysinfo Overhead=1 Level=1 NoEnv Template="retrieveLinuxMemoryStats: Failed to open /proc/sys/vm/swappiness. Error code = %d."
 TraceException=Trc_PRT_retrieveLinuxMemoryStats_failedReadingSwappiness Group=sysinfo Overhead=1 Level=1 NoEnv Template="retrieveLinuxMemoryStats: Failed to read /proc/sys/vm/swappiness. Error code = %d."
 TraceException=Trc_PRT_retrieveLinuxMemoryStats_unexpectedSwappinessFormat Group=sysinfo Overhead=1 Level=1 NoEnv Template="retrieveLinuxMemoryStats: Expected %d items to read, but read %d items."
+
+TraceEntry=Trc_PRT_sysinfo_get_process_start_time_enter Group=sysinfo Overhead=1 Level=1 NoEnv Template="Enter omrsysinfo_get_process_start_time for pid %llu"
+TraceEntry=Trc_PRT_sysinfo_get_process_start_time_stat_error Group=sysinfo Overhead=1 Level=1 NoEnv Template="omrsysinfo_get_process_start_time stat error for pid %llu"
+TraceEntry=Trc_PRT_sysinfo_get_process_start_time_sysctl_error Group=sysinfo Overhead=1 Level=1 NoEnv Template="omrsysinfo_get_process_start_time sysctl error for pid %llu"
+TraceEntry=Trc_PRT_sysinfo_get_process_start_time_pid_does_not_exist Group=sysinfo Overhead=1 Level=1 NoEnv Template="omrsysinfo_get_process_start_time pid %llu does not exist"
+TraceEntry=Trc_PRT_sysinfo_get_process_start_time_getprocs_error Group=sysinfo Overhead=1 Level=1 NoEnv Template="omrsysinfo_get_process_start_time getprocs error for pid %llu"
+TraceEntry=Trc_PRT_sysinfo_get_process_start_time_getthent_error Group=sysinfo Overhead=1 Level=1 NoEnv Template="omrsysinfo_get_process_start_time getthent error for pid %llu"
+TraceEntry=Trc_PRT_sysinfo_get_process_start_time_OpenProcess_error Group=sysinfo Overhead=1 Level=1 NoEnv Template="omrsysinfo_get_process_start_time OpenProcess error for pid %llu"
+TraceEntry=Trc_PRT_sysinfo_get_process_start_time_GetProcessTimes_error Group=sysinfo Overhead=1 Level=1 NoEnv Template="omrsysinfo_get_process_start_time GetProcessTimes error for pid %llu"
+TraceExit=Trc_PRT_sysinfo_get_process_start_time_exit Group=sysinfo Overhead=1 Level=1 NoEnv Template="Exit omrsysinfo_get_process_start_time for pid %llu"

port/common/omrsysinfo.c

@@ -1178,3 +1178,15 @@ omrsysinfo_cgroup_subsystem_iterator_destroy(struct OMRPortLibrary *portLibrary,
 {
 	return;
 }
+
+/**
+ * Get the process start time in ns precision epoch time.
+ * @param[in] portLibrary The port library
+ * @param[in] pid The process ID
+ * @return 0 if the process does not exist, process start time in ns precision epoch time if the process exists
+ */
+uint64_t
+omrsysinfo_get_process_start_time(struct OMRPortLibrary *portLibrary, uintptr_t pid)
+{
+	return 0;
+}

port/omrportpriv.h

@@ -661,6 +661,8 @@ extern J9_CFUNC int32_t
 omrsysinfo_cgroup_subsystem_iterator_next(struct OMRPortLibrary *portLibrary, struct OMRCgroupMetricIteratorState *state, struct OMRCgroupMetricElement *metricElement);
 extern J9_CFUNC void
 omrsysinfo_cgroup_subsystem_iterator_destroy(struct OMRPortLibrary *portLibrary, struct OMRCgroupMetricIteratorState *state);
+extern J9_CFUNC uint64_t
+omrsysinfo_get_process_start_time(struct OMRPortLibrary *portLibrary, uintptr_t pid);
 
 /* J9SourceJ9Signal*/
 extern J9_CFUNC int32_t

port/unix/omrsysinfo.c

@@ -80,6 +80,7 @@
 
 
 #if defined(J9ZOS390)
+#include "omrgetthent.h"
 #include "omrsimap.h"
 #endif /* defined(J9ZOS390) */
 
@@ -95,6 +96,7 @@
 
 #if defined(AIXPPC)
 #include <fcntl.h>
+#include <procinfo.h>
 #include <sys/procfs.h>
 #include <sys/systemcfg.h>
 #endif /* defined(AIXPPC) */
@@ -195,6 +197,19 @@ uintptr_t Get_Number_Of_CPUs();
 #define JIFFIES         100
 #define USECS_PER_SEC   1000000
 #define TICKS_TO_USEC   ((uint64_t)(USECS_PER_SEC/JIFFIES))
+#define OMRPORT_SYSINFO_PROC_DIR_BUFFER_SIZE 256
+#define OMRPORT_SYSINFO_STAT_ERROR -1
+#define OMRPORT_SYSINFO_NUM_SYSCTL_ARGS 4
+#define OMRPORT_SYSINFO_SYSCTL_ERROR -1
+#define OMRPORT_SYSINFO_NANOSECONDS_PER_MICROSECOND 1000ULL
+#define OMRPORT_SYSINFO_GETPROCS_ERROR -1
+#define OMRPORT_SYSINFO_GETPROCS_NONEXISTING_PID_ERROR 0
+#define OMRPORT_SYSINFO_GETTHENT_ERROR -1
+#if defined(_LP64)
+#define GETTHENT BPX4GTH
+#else /* defined(_LP64) */
+#define GETTHENT BPX1GTH
+#endif /* defined(_LP64) */
 
 static uintptr_t copyEnvToBuffer(struct OMRPortLibrary *portLibrary, void *args);
 static uintptr_t copyEnvToBufferSignalHandler(struct OMRPortLibrary *portLib, uint32_t gpType, void *gpInfo, void *unUsed);
@@ -598,6 +613,19 @@ static intptr_t searchSystemPath(struct OMRPortLibrary *portLibrary, char *filen
 #if defined(J9ZOS390)
 static void setOSFeature(struct OMROSDesc *desc, uint32_t feature);
 static intptr_t getZOSDescription(struct OMRPortLibrary *portLibrary, struct OMROSDesc *desc);
+#if defined(_LP64)
+#pragma linkage(BPX4GTH,OS)
+#else /* defined(_LP64) */
+#pragma linkage(BPX1GTH,OS)
+#endif /* defined(_LP64) */
+void GETTHENT(
+	unsigned int *inputSize,
+	unsigned char **input,
+	unsigned int *outputSize,
+	unsigned char **output,
+	unsigned int *ret,
+	unsigned int *retCode,
+	unsigned int *reasonCode);
 #endif /* defined(J9ZOS390) */
 
 #if !defined(RS6000) && !defined(J9ZOS390) && !defined(OSX) && !defined(OMRZTPF)
@@ -7354,3 +7382,84 @@ get_Dispatch_IstreamCount(void) {
 	return (uintptr_t)numberOfIStreams;
 }
 #endif /* defined(OMRZTPF) */
+
+uint64_t
+omrsysinfo_get_process_start_time(struct OMRPortLibrary *portLibrary, uintptr_t pid)
+{
+	Trc_PRT_sysinfo_get_process_start_time_enter((unsigned long long)pid);
+	uint64_t processStartTimeInNanoseconds = 0;
+	if (0 != omrsysinfo_process_exists(portLibrary, pid)) {
+#if defined(LINUX)
+		char procDir[OMRPORT_SYSINFO_PROC_DIR_BUFFER_SIZE] = {0};
+		struct stat st;
+		snprintf(procDir, sizeof(procDir), "/proc/%" PRIuPTR, pid);
+		if (OMRPORT_SYSINFO_STAT_ERROR == stat(procDir, &st)) {
+			Trc_PRT_sysinfo_get_process_start_time_stat_error((unsigned long long)pid);
+			goto done;
+		}
+		processStartTimeInNanoseconds = (uint64_t)st.st_mtime * OMRPORT_TIME_DELTA_IN_NANOSECONDS + st.st_mtim.tv_nsec;
+#elif defined(OSX) /* defined(LINUX) */
+		int mib[OMRPORT_SYSINFO_NUM_SYSCTL_ARGS] = {CTL_KERN, KERN_PROC, KERN_PROC_PID, pid};
+		size_t len = sizeof(struct kinfo_proc);
+		struct kinfo_proc procInfo;
+		if (OMRPORT_SYSINFO_SYSCTL_ERROR == sysctl(mib, OMRPORT_SYSINFO_NUM_SYSCTL_ARGS, &procInfo, &len, NULL, 0)) {
+			Trc_PRT_sysinfo_get_process_start_time_sysctl_error((unsigned long long)pid);
+			goto done;
+		}
+		if (0 == len) {
+			Trc_PRT_sysinfo_get_process_start_time_pid_does_not_exist((unsigned long long)pid);
+			goto done;
+		}
+		processStartTimeInNanoseconds =
+			((uint64_t)procInfo.kp_proc.p_starttime.tv_sec * OMRPORT_TIME_DELTA_IN_NANOSECONDS) +
+			((uint64_t)procInfo.kp_proc.p_starttime.tv_usec * OMRPORT_SYSINFO_NANOSECONDS_PER_MICROSECOND);
+#elif defined(AIXPPC) /* defined(OSX) */
+		pid_t convertedPid = (pid_t)pid;
+		struct procsinfo procInfos[] = {0};
+		int ret = getprocs(procInfos, sizeof(procInfos[0]), NULL, 0, &convertedPid, sizeof(procInfos) / sizeof(procInfos[0]));
+		if (OMRPORT_SYSINFO_GETPROCS_ERROR == ret) {
+			Trc_PRT_sysinfo_get_process_start_time_getprocs_error((unsigned long long)pid);
+			goto done;
+		} else if (OMRPORT_SYSINFO_GETPROCS_NONEXISTING_PID_ERROR == ret) {
+			Trc_PRT_sysinfo_get_process_start_time_pid_does_not_exist((unsigned long long)pid);
+			goto done;
+		}
+		processStartTimeInNanoseconds = (uint64_t)(procInfos[0].pi_start) * OMRPORT_TIME_DELTA_IN_NANOSECONDS;
+#elif defined(J9ZOS390) /* defined(AIXPPC) */
+		pgtha pgtha;
+		ProcessData processData;
+		pgthc *currentProcessInfo = NULL;
+		uint32_t dataOffset = 0;
+		uint32_t inputSize = sizeof(pgtha);
+		unsigned char *input = (unsigned char *)&pgtha;
+		uint32_t outputSize = sizeof(ProcessData);
+		unsigned char *output = (unsigned char *)&processData;
+		uint32_t ret = 0;
+		uint32_t retCode = 0;
+		uint32_t reasonCode = 0;
+		memset(input, 0, sizeof(pgtha));
+		memset(output, 0, sizeof(processData));
+		pgtha.pid = pid;
+		pgtha.accesspid = PGTHA_ACCESS_CURRENT;
+		pgtha.flag1 = PGTHA_FLAG_PROCESS_DATA;
+		GETTHENT(&inputSize, &input, &outputSize, &output, &ret, &retCode, &reasonCode);
+		if (OMRPORT_SYSINFO_GETTHENT_ERROR == ret) {
+			Trc_PRT_sysinfo_get_process_start_time_getthent_error((unsigned long long)pid);
+			goto done;
+		}
+		dataOffset = *((unsigned int *)processData.pgthb.offc);
+		dataOffset = (dataOffset & I_32_MAX) >> 8;
+		currentProcessInfo = (pgthc *)(((char *)&processData) + dataOffset);
+		processStartTimeInNanoseconds = (uint64_t)currentProcessInfo->starttime * OMRPORT_TIME_DELTA_IN_NANOSECONDS;
+#else /* defined(J9ZOS390) */
+		portLibrary->nls_printf(
+			portLibrary,
+			J9NLS_WARNING,
+			J9NLS_PORT_SYSINFO_UNSUPPORTED_PLATFORM_ERROR,
+			"omrsysinfo_get_process_start_time is unsupported on this platform.");
+#endif /* defined(LINUX) */
+	}
+done:
+	Trc_PRT_sysinfo_get_process_start_time_exit((unsigned long long)pid);
+	return processStartTimeInNanoseconds;
+}

port/win32/omrsysinfo.c

@@ -46,6 +46,10 @@
 #include "ut_omrport.h"
 #include "omrsysinfo_helpers.h"
 
+#define OMRPORT_SYSINFO_WINDOWS_TICK 10000000ULL
+#define OMRPORT_SYSINFO_SEC_TO_UNIX_EPOCH 11644473600ULL
+#define OMRPORT_SYSINFO_NS100_PER_SEC 10000000ULL
+
 static int32_t copyEnvToBuffer(struct OMRPortLibrary *portLibrary, void *args);
 
 typedef struct CopyEnvToBufferArgs {
@@ -1990,3 +1994,30 @@ omrsysinfo_cgroup_subsystem_iterator_destroy(struct OMRPortLibrary *portLibrary,
 	return;
 }
 
+uint64_t
+omrsysinfo_get_process_start_time(struct OMRPortLibrary *portLibrary, uintptr_t pid)
+{
+	Trc_PRT_sysinfo_get_process_start_time_enter((unsigned long long)pid);
+	uint64_t processStartTimeInNanoseconds = 0;
+	if (0 != omrsysinfo_process_exists(portLibrary, pid)) {
+		double seconds = 0;
+		FILETIME createTime, exitTime, kernelTime, userTime;
+		HANDLE process = OpenProcess(PROCESS_QUERY_INFORMATION, FALSE, (DWORD)pid);
+		if (NULL == process) {
+			Trc_PRT_sysinfo_get_process_start_time_OpenProcess_error((unsigned long long)pid);
+			goto done;
+		}
+		if (!GetProcessTimes(process, &createTime, &exitTime, &kernelTime, &userTime)) {
+			Trc_PRT_sysinfo_get_process_start_time_GetProcessTimes_error((unsigned long long)pid);
+			goto cleanup;
+		}
+		seconds = (double)(*(LONGLONG*)&(createTime)) / OMRPORT_SYSINFO_WINDOWS_TICK;
+		processStartTimeInNanoseconds = (uint64_t)((seconds - OMRPORT_SYSINFO_SEC_TO_UNIX_EPOCH) * OMRPORT_SYSINFO_NS100_PER_SEC);
+		processStartTimeInNanoseconds *= 100;
+cleanup:
+		CloseHandle(process);
+	}
+done:
+	Trc_PRT_sysinfo_get_process_start_time_exit((unsigned long long)pid);
+	return processStartTimeInNanoseconds;
+}

port/win32/omrtime.c

@@ -181,7 +181,7 @@ omrtime_nano_time(struct OMRPortLibrary *portLibrary)
 	if (PPG_time_hiresClockFrequency == OMRTIME_NANOSECONDS_PER_SECOND) {
 		nanos = ticks;
 	} else if (PPG_time_hiresClockFrequency < OMRTIME_NANOSECONDS_PER_SECOND) {
-		nanos = (int64_t)(ticks * (OMRTIME_NANOSECONDS_PER_SECOND / PPG_time_hiresClockFrequency));
+		nanos = (int64_t)(ticks * (OMRPORT_TIME_DELTA_IN_NANOSECONDS / PPG_time_hiresClockFrequency));
 	} else {
 		nanos = (int64_t)(ticks / (PPG_time_hiresClockFrequency / OMRTIME_NANOSECONDS_PER_SECOND));
 	}