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kfdtest: Convert KFDExceptionTest into multi-GPU test framework

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Signed-off-by: Xiaogang Chen <Xiaogang.Chen@amd.com>
Change-Id: I545ac485d13a3a56a3b352926ec71daa5b074862
Cette révision appartient à :
Xiaogang Chen
2024-09-22 19:35:19 -05:00
révisé par Xiaogang Chen
Parent 0357e2e139
révision dbccf11ef8
2 fichiers modifiés avec 156 ajouts et 103 suppressions
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libhsakmt/tests/kfdtest/src/KFDExceptionTest.cpp
+148 -101
Voir le fichier
@@ -58,31 +58,32 @@ void KFDExceptionTest::TearDown() {
* Should be called from a Child Process since the Memory Fault causes
* all the queues to be halted.
*/
void KFDExceptionTest::TestMemoryException(int defaultGPUNode, HSAuint64 pSrc,
void KFDExceptionTest::TestMemoryException(int gpuNode, HSAuint64 pSrc,
HSAuint64 pDst, unsigned int dimX,
unsigned int dimY, unsigned int dimZ) {
PM4Queue queue;
HsaEvent *vmFaultEvent;
HsaMemoryBuffer isaBuffer(PAGE_SIZE, defaultGPUNode, true/*zero*/, false/*local*/, true/*exec*/);
HsaMemoryBuffer isaBuffer(PAGE_SIZE, gpuNode, true/*zero*/, false/*local*/, true/*exec*/);
HSAuint64 faultAddress, page_mask = ~((HSAuint64)PAGE_SIZE - 1);
Dispatch dispatch(isaBuffer, false);
HsaEventDescriptor eventDesc;
eventDesc.EventType = HSA_EVENTTYPE_MEMORY;
eventDesc.NodeId = defaultGPUNode;
eventDesc.NodeId = gpuNode;
eventDesc.SyncVar.SyncVar.UserData = NULL;
eventDesc.SyncVar.SyncVarSize = 0;
ASSERT_SUCCESS(m_pAsm->RunAssembleBuf(CopyDwordIsa, isaBuffer.As<char*>()));
ASSERT_SUCCESS_GPU(GetAssemblerFromNodeId(
gpuNode)->RunAssembleBuf(CopyDwordIsa, isaBuffer.As<char*>()), gpuNode);
m_ChildStatus = queue.Create(defaultGPUNode);
m_ChildStatus = queue.Create(gpuNode);
if (m_ChildStatus != HSAKMT_STATUS_SUCCESS) {
WARN() << "Queue create failed" << std::endl;
WARN() << "Queue create failed, on gpuNode: " << gpuNode << std::endl;
return;
}
m_ChildStatus = hsaKmtCreateEvent(&eventDesc, true, false, &vmFaultEvent);
if (m_ChildStatus != HSAKMT_STATUS_SUCCESS) {
WARN() << "Event create failed" << std::endl;
WARN() << "Event create failed on gpuNode: " << gpuNode << std::endl;
goto queuefail;
}
@@ -92,12 +93,12 @@ void KFDExceptionTest::TestMemoryException(int defaultGPUNode, HSAuint64 pSrc,
m_ChildStatus = hsaKmtWaitOnEvent(vmFaultEvent, g_TestTimeOut);
if (m_ChildStatus != HSAKMT_STATUS_SUCCESS) {
WARN() << "Wait failed. No Exception triggered" << std::endl;
WARN() << "Wait failed. No Exception triggered on gpuNode: " << gpuNode << std::endl;
goto eventfail;
}
if (vmFaultEvent->EventData.EventType != HSA_EVENTTYPE_MEMORY) {
WARN() << "Unexpected Event Received " << vmFaultEvent->EventData.EventType
WARN() << "Unexpected Event Received on gpuNode: " << gpuNode << vmFaultEvent->EventData.EventType
<< std::endl;
m_ChildStatus = HSAKMT_STATUS_ERROR;
goto eventfail;
@@ -105,7 +106,7 @@ void KFDExceptionTest::TestMemoryException(int defaultGPUNode, HSAuint64 pSrc,
faultAddress = vmFaultEvent->EventData.EventData.MemoryAccessFault.VirtualAddress;
if (faultAddress != (pSrc & page_mask) &&
faultAddress != (pDst & page_mask) ) {
WARN() << "Unexpected Fault Address " << faultAddress
WARN() << "gpuNode: " << gpuNode << " Unexpected Fault Address " << faultAddress
<< " expected " << (pSrc & page_mask) << " or "
<< (pDst & page_mask) << std::endl;
m_ChildStatus = HSAKMT_STATUS_ERROR;
@@ -117,7 +118,7 @@ queuefail:
queue.Destroy();
}
void KFDExceptionTest::TestSdmaException(int defaultGPUNode, void *pDst) {
void KFDExceptionTest::TestSdmaException(int gpuNode, void *pDst) {
SDMAQueue queue;
HsaEvent *vmFaultEvent;
HSAuint64 faultAddress, page_mask = ~((HSAuint64)PAGE_SIZE - 1);
@@ -125,19 +126,19 @@ void KFDExceptionTest::TestSdmaException(int defaultGPUNode, void *pDst) {
HsaEventDescriptor eventDesc;
eventDesc.EventType = HSA_EVENTTYPE_MEMORY;
eventDesc.NodeId = defaultGPUNode;
eventDesc.NodeId = gpuNode;
eventDesc.SyncVar.SyncVar.UserData = NULL;
eventDesc.SyncVar.SyncVarSize = 0;
m_ChildStatus = queue.Create(defaultGPUNode);
m_ChildStatus = queue.Create(gpuNode);
if (m_ChildStatus != HSAKMT_STATUS_SUCCESS) {
WARN() << "Queue create failed" << std::endl;
WARN() << "Queue create failed on gpuNode: " << gpuNode << std::endl;
return;
}
m_ChildStatus = hsaKmtCreateEvent(&eventDesc, true, false, &vmFaultEvent);
if (m_ChildStatus != HSAKMT_STATUS_SUCCESS) {
WARN() << "Event create failed" << std::endl;
WARN() << "Event create failed on gpuNode: " << gpuNode << std::endl;
goto queuefail;
}
@@ -147,7 +148,7 @@ void KFDExceptionTest::TestSdmaException(int defaultGPUNode, void *pDst) {
m_ChildStatus = hsaKmtWaitOnEvent(vmFaultEvent, g_TestTimeOut);
if (m_ChildStatus != HSAKMT_STATUS_SUCCESS) {
WARN() << "Wait failed. No Exception triggered" << std::endl;
WARN() << "Wait failed. No Exception triggered on gpuNode: " << gpuNode << std::endl;
goto eventfail;
}
@@ -159,7 +160,7 @@ void KFDExceptionTest::TestSdmaException(int defaultGPUNode, void *pDst) {
}
faultAddress = vmFaultEvent->EventData.EventData.MemoryAccessFault.VirtualAddress;
if (faultAddress != ((HSAuint64)pDst & page_mask) ) {
WARN() << "Unexpected Fault Address " << faultAddress
WARN() << "gpuNode: " << gpuNode << "Unexpected Fault Address " << faultAddress
<< " expected " << ((HSAuint64)pDst & page_mask) << std::endl;
m_ChildStatus = HSAKMT_STATUS_ERROR;
}
@@ -170,41 +171,49 @@ queuefail:
queue.Destroy();
}
/* Test Bad Address access in a child process */
TEST_F(KFDExceptionTest, AddressFault) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL);
void AddressFault(KFDTEST_PARAMETERS* pTestParamters) {
int defaultGPUNode = m_NodeInfo.HsaDefaultGPUNode();
ASSERT_GE(defaultGPUNode, 0) << "failed to get default GPU Node";
int gpuNode = pTestParamters->gpuNode;
KFDExceptionTest* pKFDExceptionTest = (KFDExceptionTest*)pTestParamters->pTestObject;
const HSAuint32 m_FamilyId = pKFDExceptionTest->GetFamilyIdFromNodeId(gpuNode);
if (m_FamilyId == FAMILY_RV) {
LOG() << "Skipping test: IOMMU issues on Raven." << std::endl;
return;
}
m_ChildPid = fork();
pid_t m_ChildPid = fork();
if (m_ChildPid == 0) {
KFDBaseComponentTest::TearDown();
KFDBaseComponentTest::SetUp();
pKFDExceptionTest->TearDown();
pKFDExceptionTest->SetUp();
HsaMemoryBuffer srcBuffer(PAGE_SIZE, defaultGPUNode, false);
HsaMemoryBuffer srcBuffer(PAGE_SIZE, gpuNode, false);
srcBuffer.Fill(0xAA55AA55);
TestMemoryException(defaultGPUNode, srcBuffer.As<HSAuint64>(),
0x12345678ULL);
} else {
pKFDExceptionTest->TestMemoryException(gpuNode, srcBuffer.As<HSAuint64>(),
0x12345678ULL);
exit(0);
} else {
int childStatus;
waitpid(m_ChildPid, &childStatus, 0);
if (hsakmt_is_dgpu()) {
EXPECT_EQ(WIFEXITED(childStatus), true);
EXPECT_EQ(WEXITSTATUS(childStatus), HSAKMT_STATUS_SUCCESS);
EXPECT_EQ_GPU(WIFEXITED(childStatus), true, gpuNode);
EXPECT_EQ_GPU(WEXITSTATUS(childStatus), HSAKMT_STATUS_SUCCESS, gpuNode);
} else {
EXPECT_EQ(WIFSIGNALED(childStatus), true);
EXPECT_EQ(WTERMSIG(childStatus), SIGSEGV);
EXPECT_EQ_GPU(WIFSIGNALED(childStatus), true, gpuNode);
EXPECT_EQ_GPU(WTERMSIG(childStatus), SIGSEGV, gpuNode);
}
}
}
}
/* Test Bad Address access in a child process */
TEST_F(KFDExceptionTest, AddressFault) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL);
ASSERT_SUCCESS(KFDTest_Launch(AddressFault));
TEST_END
}
@@ -212,32 +221,33 @@ TEST_F(KFDExceptionTest, AddressFault) {
/* Allocate Read Only buffer. Test Memory Exception failure by
* attempting to write to that buffer in the child process.
*/
TEST_F(KFDExceptionTest, PermissionFault) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL)
void PermissionFault(KFDTEST_PARAMETERS* pTestParamters) {
int defaultGPUNode = m_NodeInfo.HsaDefaultGPUNode();
ASSERT_GE(defaultGPUNode, 0) << "failed to get default GPU Node";
int gpuNode = pTestParamters->gpuNode;
KFDExceptionTest* pKFDExceptionTest = (KFDExceptionTest*)pTestParamters->pTestObject;
const HSAuint32 m_FamilyId = pKFDExceptionTest->GetFamilyIdFromNodeId(gpuNode);
if (m_FamilyId == FAMILY_RV) {
LOG() << "Skipping test: IOMMU issues on Raven." << std::endl;
return;
}
m_ChildPid = fork();
pid_t m_ChildPid = fork();
if (m_ChildPid == 0) {
KFDBaseComponentTest::TearDown();
KFDBaseComponentTest::SetUp();
pKFDExceptionTest->TearDown();
pKFDExceptionTest->SetUp();
HsaMemoryBuffer readOnlyBuffer(PAGE_SIZE, defaultGPUNode, false /*zero*/,
HsaMemoryBuffer readOnlyBuffer(PAGE_SIZE, gpuNode, false /*zero*/,
false /*isLocal*/, true /*isExec*/,
false /*isScratch*/, true /*isReadOnly*/);
HsaMemoryBuffer srcSysBuffer(PAGE_SIZE, defaultGPUNode, false);
HsaMemoryBuffer srcSysBuffer(PAGE_SIZE, gpuNode, false);
srcSysBuffer.Fill(0xAA55AA55);
TestMemoryException(defaultGPUNode, srcSysBuffer.As<HSAuint64>(),
pKFDExceptionTest->TestMemoryException(gpuNode, srcSysBuffer.As<HSAuint64>(),
readOnlyBuffer.As<HSAuint64>());
exit(0);
} else {
int childStatus;
@@ -251,40 +261,49 @@ TEST_F(KFDExceptionTest, PermissionFault) {
}
}
}
TEST_F(KFDExceptionTest, PermissionFault) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL)
ASSERT_SUCCESS(KFDTest_Launch(PermissionFault));
TEST_END
}
/* Allocate Read Only user pointer buffer. Test Memory Exception failure by
* attempting to write to that buffer in the child process.
*/
TEST_F(KFDExceptionTest, PermissionFaultUserPointer) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL)
void PermissionFaultUserPointer(KFDTEST_PARAMETERS* pTestParamters) {
int defaultGPUNode = m_NodeInfo.HsaDefaultGPUNode();
ASSERT_GE(defaultGPUNode, 0) << "failed to get default GPU Node";
int gpuNode = pTestParamters->gpuNode;
KFDExceptionTest* pKFDExceptionTest = (KFDExceptionTest*)pTestParamters->pTestObject;
const HSAuint32 m_FamilyId = pKFDExceptionTest->GetFamilyIdFromNodeId(gpuNode);
if (m_FamilyId == FAMILY_RV) {
LOG() << "Skipping test: IOMMU issues on Raven." << std::endl;
return;
}
m_ChildPid = fork();
pid_t m_ChildPid = fork();
if (m_ChildPid == 0) {
KFDBaseComponentTest::TearDown();
KFDBaseComponentTest::SetUp();
pKFDExceptionTest->TearDown();
pKFDExceptionTest->SetUp();
void *pBuf = mmap(NULL, PAGE_SIZE, PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
ASSERT_NE(pBuf, MAP_FAILED);
EXPECT_SUCCESS(hsaKmtRegisterMemory(pBuf, PAGE_SIZE));
EXPECT_SUCCESS(hsaKmtMapMemoryToGPU(pBuf, PAGE_SIZE, NULL));
HsaMemoryBuffer srcSysBuffer(PAGE_SIZE, defaultGPUNode, false);
void *pBuf = mmap(NULL, PAGE_SIZE, PROT_READ,
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
ASSERT_NE(pBuf, MAP_FAILED);
EXPECT_SUCCESS(hsaKmtRegisterMemory(pBuf, PAGE_SIZE));
EXPECT_SUCCESS(hsaKmtMapMemoryToGPU(pBuf, PAGE_SIZE, NULL));
HsaMemoryBuffer srcSysBuffer(PAGE_SIZE, gpuNode, false);
srcSysBuffer.Fill(0xAA55AA55);
srcSysBuffer.Fill(0xAA55AA55);
TestMemoryException(defaultGPUNode, srcSysBuffer.As<HSAuint64>(),
(HSAuint64)pBuf);
pKFDExceptionTest->TestMemoryException(gpuNode, srcSysBuffer.As<HSAuint64>(),
(HSAuint64)pBuf);
exit(0);
} else {
int childStatus;
@@ -296,7 +315,15 @@ TEST_F(KFDExceptionTest, PermissionFaultUserPointer) {
EXPECT_EQ(WIFSIGNALED(childStatus), true);
EXPECT_EQ(WTERMSIG(childStatus), SIGSEGV);
}
}
}
}
TEST_F(KFDExceptionTest, PermissionFaultUserPointer) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL)
ASSERT_SUCCESS(KFDTest_Launch(PermissionFault));
TEST_END
}
@@ -304,13 +331,12 @@ TEST_F(KFDExceptionTest, PermissionFaultUserPointer) {
/* Test VM fault storm handling by copying to/from invalid pointers
* with lots of work items at the same time
*/
TEST_F(KFDExceptionTest, FaultStorm) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL)
void FaultStorm(KFDTEST_PARAMETERS* pTestParamters) {
int defaultGPUNode = m_NodeInfo.HsaDefaultGPUNode();
ASSERT_GE(defaultGPUNode, 0) << "failed to get default GPU Node";
int gpuNode = pTestParamters->gpuNode;
KFDExceptionTest* pKFDExceptionTest = (KFDExceptionTest*)pTestParamters->pTestObject;
const HSAuint32 m_FamilyId = pKFDExceptionTest->GetFamilyIdFromNodeId(gpuNode);
if (m_FamilyId == FAMILY_RV) {
LOG() << "Skipping test: IOMMU issues on Raven." << std::endl;
return;
@@ -318,37 +344,46 @@ TEST_F(KFDExceptionTest, FaultStorm) {
HSAKMT_STATUS status;
m_ChildPid = fork();
pid_t m_ChildPid = fork();
if (m_ChildPid == 0) {
KFDBaseComponentTest::TearDown();
KFDBaseComponentTest::SetUp();
pKFDExceptionTest->TearDown();
pKFDExceptionTest->SetUp();
TestMemoryException(defaultGPUNode, 0x12345678, 0x76543210, 1024, 1024, 1);
pKFDExceptionTest->TestMemoryException(gpuNode, 0x12345678, 0x76543210, 1024, 1024, 1);
exit(0);
} else {
int childStatus;
waitpid(m_ChildPid, &childStatus, 0);
if (hsakmt_is_dgpu()) {
EXPECT_EQ(WIFEXITED(childStatus), true);
EXPECT_EQ(WEXITSTATUS(childStatus), HSAKMT_STATUS_SUCCESS);
EXPECT_EQ_GPU(WIFEXITED(childStatus), true, gpuNode);
EXPECT_EQ_GPU(WEXITSTATUS(childStatus), HSAKMT_STATUS_SUCCESS, gpuNode);
} else {
EXPECT_EQ(WIFSIGNALED(childStatus), true);
EXPECT_EQ(WTERMSIG(childStatus), SIGSEGV);
EXPECT_EQ_GPU(WIFSIGNALED(childStatus), true, gpuNode);
EXPECT_EQ_GPU(WTERMSIG(childStatus), SIGSEGV, gpuNode);
}
}
}
TEST_F(KFDExceptionTest, FaultStorm) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL)
ASSERT_SUCCESS(KFDTest_Launch(FaultStorm));
TEST_END
}
/*
*/
TEST_F(KFDExceptionTest, SdmaQueueException) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL)
void SdmaQueueException(KFDTEST_PARAMETERS* pTestParamters) {
int defaultGPUNode = m_NodeInfo.HsaDefaultGPUNode();
ASSERT_GE(defaultGPUNode, 0) << "failed to get default GPU Node";
int gpuNode = pTestParamters->gpuNode;
KFDExceptionTest* pKFDExceptionTest = (KFDExceptionTest*)pTestParamters->pTestObject;
const HSAuint32 m_FamilyId = pKFDExceptionTest->GetFamilyIdFromNodeId(gpuNode);
if (m_FamilyId == FAMILY_RV) {
LOG() << "Skipping test: IOMMU issues on Raven." << std::endl;
return;
@@ -356,37 +391,49 @@ TEST_F(KFDExceptionTest, SdmaQueueException) {
HSAKMT_STATUS status;
m_ChildPid = fork();
pid_t m_ChildPid = fork();
if (m_ChildPid == 0) {
unsigned int* pDb = NULL;
unsigned int *nullPtr = NULL;
unsigned int* pDb = NULL;
unsigned int *nullPtr = NULL;
KFDBaseComponentTest::TearDown();
KFDBaseComponentTest::SetUp();
pKFDExceptionTest->TearDown();
pKFDExceptionTest->SetUp();
m_MemoryFlags.ui32.NonPaged = 1;
m_MemoryFlags.ui32.HostAccess = 0;
ASSERT_SUCCESS(hsaKmtAllocMemory(defaultGPUNode, PAGE_SIZE, m_MemoryFlags,
reinterpret_cast<void**>(&pDb)));
// verify that pDb is not null before it's being used
ASSERT_NE(nullPtr, pDb) << "hsaKmtAllocMemory returned a null pointer";
ASSERT_SUCCESS(hsaKmtMapMemoryToGPU(pDb, PAGE_SIZE, NULL));
EXPECT_SUCCESS(hsaKmtUnmapMemoryToGPU(pDb));
HsaMemFlags m_MemoryFlags;
m_MemoryFlags.Value = 0;
// setting memory flags with default values , can be modified according to needs
m_MemoryFlags.ui32.NonPaged = 1; // Paged
m_MemoryFlags.ui32.HostAccess = 0; // Host accessible
ASSERT_SUCCESS_GPU(hsaKmtAllocMemory(gpuNode, PAGE_SIZE, m_MemoryFlags,
reinterpret_cast<void**>(&pDb)), gpuNode);
// verify that pDb is not null before it's being used
ASSERT_NE_GPU(nullPtr, pDb, gpuNode) << "hsaKmtAllocMemory returned a null pointer";
ASSERT_SUCCESS_GPU(hsaKmtMapMemoryToGPU(pDb, PAGE_SIZE, NULL), gpuNode);
EXPECT_SUCCESS_GPU(hsaKmtUnmapMemoryToGPU(pDb), gpuNode);
TestSdmaException(defaultGPUNode, pDb);
EXPECT_SUCCESS(hsaKmtFreeMemory(pDb, PAGE_SIZE));
pKFDExceptionTest->TestSdmaException(gpuNode, pDb);
EXPECT_SUCCESS_GPU(hsaKmtFreeMemory(pDb, PAGE_SIZE), gpuNode);
exit(0);
} else {
int childStatus;
waitpid(m_ChildPid, &childStatus, 0);
if (hsakmt_is_dgpu()) {
EXPECT_EQ(WIFEXITED(childStatus), true);
EXPECT_EQ(WEXITSTATUS(childStatus), HSAKMT_STATUS_SUCCESS);
EXPECT_EQ_GPU(WIFEXITED(childStatus), true, gpuNode);
EXPECT_EQ_GPU(WEXITSTATUS(childStatus), HSAKMT_STATUS_SUCCESS, gpuNode);
} else {
EXPECT_EQ(WIFSIGNALED(childStatus), true);
EXPECT_EQ(WTERMSIG(childStatus), SIGSEGV);
EXPECT_EQ_GPU(WIFSIGNALED(childStatus), true, gpuNode);
EXPECT_EQ_GPU(WTERMSIG(childStatus), SIGSEGV, gpuNode);
}
}
}
TEST_F(KFDExceptionTest, SdmaQueueException) {
TEST_REQUIRE_ENV_CAPABILITIES(ENVCAPS_64BITLINUX);
TEST_START(TESTPROFILE_RUNALL)
ASSERT_SUCCESS(KFDTest_Launch(SdmaQueueException));
TEST_END
}
libhsakmt/tests/kfdtest/src/KFDExceptionTest.hpp
+8 -2
Voir le fichier
@@ -49,14 +49,20 @@ class KFDExceptionTest : public KFDBaseComponentTest {
}
}
friend void AddressFault(KFDTEST_PARAMETERS* pTestParamters);
friend void PermissionFault(KFDTEST_PARAMETERS* pTestParamters);
friend void PermissionFaultUserPointer(KFDTEST_PARAMETERS* pTestParamters);
friend void FaultStorm(KFDTEST_PARAMETERS* pTestParamters);
friend void SdmaQueueException(KFDTEST_PARAMETERS* pTestParamters);
protected:
virtual void SetUp();
virtual void TearDown();
void TestMemoryException(int defaultGPUNode, HSAuint64 pSrc, HSAuint64 pDst,
void TestMemoryException(int gpuNode, HSAuint64 pSrc, HSAuint64 pDst,
unsigned int dimX = 1, unsigned int dimY = 1,
unsigned int dimZ = 1);
void TestSdmaException(int defaultGPUNode, void *pDst);
void TestSdmaException(int gpuNode, void *pDst);
protected: // Members
pid_t m_ChildPid;