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ParallelMarkTask.cpp
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ParallelMarkTask.cpp
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/*******************************************************************************
* Copyright (c) 1991, 2020 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
*******************************************************************************/
#include "omrcfg.h"
#include "omrmodroncore.h"
#include "omrport.h"
#include "modronopt.h"
#include "ut_j9mm.h"
#include "ParallelMarkTask.hpp"
#include "EnvironmentBase.hpp"
#include "MarkingScheme.hpp"
#include "WorkStack.hpp"
uintptr_t
MM_ParallelMarkTask::getVMStateID()
{
return OMRVMSTATE_GC_MARK;
}
void
MM_ParallelMarkTask::run(MM_EnvironmentBase *env)
{
env->_workStack.prepareForWork(env, (MM_WorkPackets *)(_markingScheme->getWorkPackets()));
_markingScheme->markLiveObjectsInit(env, _initMarkMap);
switch (_action) {
case MARK_ALL:
_markingScheme->markLiveObjectsRoots(env, true);
_markingScheme->markLiveObjectsScan(env);
_markingScheme->markLiveObjectsComplete(env);
break;
case MARK_ROOTS:
_markingScheme->markLiveObjectsRoots(env, false);
break;
default:
Assert_MM_unreachable();
}
env->_workStack.flush(env);
}
void
MM_ParallelMarkTask::setup(MM_EnvironmentBase *env)
{
if(env->isMainThread()) {
Assert_MM_true(_cycleState == env->_cycleState);
} else {
Assert_MM_true(NULL == env->_cycleState);
env->_cycleState = _cycleState;
}
}
void
MM_ParallelMarkTask::cleanup(MM_EnvironmentBase *env)
{
_markingScheme->workerCleanupAfterGC(env);
if (env->isMainThread()) {
Assert_MM_true(_cycleState == env->_cycleState);
} else {
env->_cycleState = NULL;
}
/* record the thread-specific parallelism stats in the trace buffer. This partially duplicates info in -Xtgc:parallel */
OMRPORT_ACCESS_FROM_OMRPORT(env->getPortLibrary());
Trc_MM_ParallelMarkTask_parallelStats(
env->getLanguageVMThread(),
(uint32_t)env->getWorkerID(),
(uint32_t)omrtime_hires_delta(0, env->_workPacketStats._workStallTime, OMRPORT_TIME_DELTA_IN_MILLISECONDS),
(uint32_t)omrtime_hires_delta(0, env->_workPacketStats._completeStallTime, OMRPORT_TIME_DELTA_IN_MILLISECONDS),
(uint32_t)omrtime_hires_delta(0, env->_markStats._syncStallTime, OMRPORT_TIME_DELTA_IN_MILLISECONDS),
(uint32_t)env->_workPacketStats._workStallCount,
(uint32_t)env->_workPacketStats._completeStallCount,
(uint32_t)env->_markStats._syncStallCount,
env->_workPacketStats.workPacketsAcquired,
env->_workPacketStats.workPacketsReleased,
env->_workPacketStats.workPacketsExchanged,
0/* TODO CRG figure out to get the array split size*/);
}
#if defined(J9MODRON_TGC_PARALLEL_STATISTICS)
void
MM_ParallelMarkTask::synchronizeGCThreads(MM_EnvironmentBase *env, const char *id)
{
OMRPORT_ACCESS_FROM_OMRPORT(env->getPortLibrary());
uint64_t startTime = omrtime_hires_clock();
MM_ParallelTask::synchronizeGCThreads(env, id);
uint64_t endTime = omrtime_hires_clock();
env->_markStats.addToSyncStallTime(startTime, endTime);
}
bool
MM_ParallelMarkTask::synchronizeGCThreadsAndReleaseMain(MM_EnvironmentBase *env, const char *id)
{
OMRPORT_ACCESS_FROM_OMRPORT(env->getPortLibrary());
uint64_t startTime = omrtime_hires_clock();
bool result = MM_ParallelTask::synchronizeGCThreadsAndReleaseMain(env, id);
uint64_t endTime = omrtime_hires_clock();
env->_markStats.addToSyncStallTime(startTime, endTime);
return result;
}
bool
MM_ParallelMarkTask::synchronizeGCThreadsAndReleaseSingleThread(MM_EnvironmentBase *env, const char *id)
{
OMRPORT_ACCESS_FROM_OMRPORT(env->getPortLibrary());
uint64_t startTime = omrtime_hires_clock();
bool result = MM_ParallelTask::synchronizeGCThreadsAndReleaseSingleThread(env, id);
uint64_t endTime = omrtime_hires_clock();
env->_markStats.addToSyncStallTime(startTime, endTime);
return result;
}
#endif /* J9MODRON_TGC_PARALLEL_STATISTICS */