author | chegar |
Thu, 17 Oct 2019 20:53:35 +0100 | |
branch | datagramsocketimpl-branch |
changeset 58678 | 9cf78a70fa4f |
parent 55002 | da9840e2f7da |
child 58679 | 9c3209ff7550 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "gc/shared/gcId.hpp" |
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#include "gc/shared/gcLocker.hpp" |
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#include "gc/shared/isGCActiveMark.hpp" |
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#include "gc/z/zCollectedHeap.hpp" |
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#include "gc/z/zDriver.hpp" |
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#include "gc/z/zHeap.inline.hpp" |
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#include "gc/z/zMessagePort.inline.hpp" |
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#include "gc/z/zServiceability.hpp" |
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#include "gc/z/zStat.hpp" |
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#include "gc/z/zVerify.hpp" |
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#include "logging/log.hpp" |
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#include "memory/universe.hpp" |
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#include "runtime/vmOperations.hpp" |
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#include "runtime/vmThread.hpp" |
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static const ZStatPhaseCycle ZPhaseCycle("Garbage Collection Cycle"); |
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static const ZStatPhasePause ZPhasePauseMarkStart("Pause Mark Start"); |
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static const ZStatPhaseConcurrent ZPhaseConcurrentMark("Concurrent Mark"); |
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static const ZStatPhaseConcurrent ZPhaseConcurrentMarkContinue("Concurrent Mark Continue"); |
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static const ZStatPhasePause ZPhasePauseMarkEnd("Pause Mark End"); |
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static const ZStatPhaseConcurrent ZPhaseConcurrentProcessNonStrongReferences("Concurrent Process Non-Strong References"); |
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static const ZStatPhaseConcurrent ZPhaseConcurrentResetRelocationSet("Concurrent Reset Relocation Set"); |
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static const ZStatPhaseConcurrent ZPhaseConcurrentSelectRelocationSet("Concurrent Select Relocation Set"); |
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static const ZStatPhasePause ZPhasePauseRelocateStart("Pause Relocate Start"); |
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static const ZStatPhaseConcurrent ZPhaseConcurrentRelocated("Concurrent Relocate"); |
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static const ZStatCriticalPhase ZCriticalPhaseGCLockerStall("GC Locker Stall", false /* verbose */); |
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static const ZStatSampler ZSamplerJavaThreads("System", "Java Threads", ZStatUnitThreads); |
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class VM_ZOperation : public VM_Operation { |
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private: |
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const uint _gc_id; |
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bool _gc_locked; |
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bool _success; |
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public: |
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VM_ZOperation() : |
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_gc_id(GCId::current()), |
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_gc_locked(false), |
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_success(false) {} |
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virtual bool needs_inactive_gc_locker() const { |
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// An inactive GC locker is needed in operations where we change the bad |
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// mask or move objects. Changing the bad mask will invalidate all oops, |
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// which makes it conceptually the same thing as moving all objects. |
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return false; |
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} |
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virtual bool do_operation() = 0; |
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virtual bool doit_prologue() { |
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Heap_lock->lock(); |
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return true; |
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} |
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virtual void doit() { |
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// Abort if GC locker state is incompatible |
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if (needs_inactive_gc_locker() && GCLocker::check_active_before_gc()) { |
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_gc_locked = true; |
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return; |
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} |
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// Setup GC id and active marker |
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GCIdMark gc_id_mark(_gc_id); |
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IsGCActiveMark gc_active_mark; |
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// Verify before operation |
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ZVerify::before_zoperation(); |
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// Execute operation |
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_success = do_operation(); |
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// Update statistics |
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ZStatSample(ZSamplerJavaThreads, Threads::number_of_threads()); |
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} |
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virtual void doit_epilogue() { |
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Heap_lock->unlock(); |
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} |
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bool gc_locked() const { |
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return _gc_locked; |
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} |
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bool success() const { |
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return _success; |
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} |
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}; |
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static bool should_clear_soft_references() { |
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// Clear if one or more allocations have stalled |
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const bool stalled = ZHeap::heap()->is_alloc_stalled(); |
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if (stalled) { |
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// Clear |
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return true; |
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} |
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// Clear if implied by the GC cause |
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const GCCause::Cause cause = ZCollectedHeap::heap()->gc_cause(); |
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if (cause == GCCause::_wb_full_gc || |
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cause == GCCause::_metadata_GC_clear_soft_refs) { |
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// Clear |
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return true; |
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} |
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// Don't clear |
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return false; |
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} |
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static bool should_boost_worker_threads() { |
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// Boost worker threads if one or more allocations have stalled |
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const bool stalled = ZHeap::heap()->is_alloc_stalled(); |
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if (stalled) { |
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// Boost |
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return true; |
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} |
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140 |
|
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// Boost worker threads if implied by the GC cause |
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const GCCause::Cause cause = ZCollectedHeap::heap()->gc_cause(); |
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if (cause == GCCause::_wb_full_gc || |
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cause == GCCause::_java_lang_system_gc || |
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145 |
cause == GCCause::_metadata_GC_clear_soft_refs) { |
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146 |
// Boost |
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|
147 |
return true; |
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|
148 |
} |
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|
149 |
|
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|
150 |
// Don't boost |
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|
151 |
return false; |
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|
152 |
} |
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153 |
|
53541 | 154 |
class VM_ZMarkStart : public VM_ZOperation { |
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public: |
53541 | 156 |
virtual VMOp_Type type() const { |
157 |
return VMOp_ZMarkStart; |
|
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} |
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|
159 |
|
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160 |
virtual bool needs_inactive_gc_locker() const { |
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|
161 |
return true; |
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162 |
} |
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|
163 |
|
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virtual bool do_operation() { |
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|
165 |
ZStatTimer timer(ZPhasePauseMarkStart); |
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ZServiceabilityMarkStartTracer tracer; |
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|
167 |
|
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|
168 |
// Set up soft reference policy |
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169 |
const bool clear = should_clear_soft_references(); |
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170 |
ZHeap::heap()->set_soft_reference_policy(clear); |
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171 |
|
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172 |
// Set up boost mode |
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173 |
const bool boost = should_boost_worker_threads(); |
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|
174 |
ZHeap::heap()->set_boost_worker_threads(boost); |
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|
175 |
|
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|
176 |
ZCollectedHeap::heap()->increment_total_collections(true /* full */); |
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|
177 |
|
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|
178 |
ZHeap::heap()->mark_start(); |
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|
179 |
return true; |
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|
180 |
} |
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|
181 |
}; |
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182 |
|
53541 | 183 |
class VM_ZMarkEnd : public VM_ZOperation { |
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public: |
53541 | 185 |
virtual VMOp_Type type() const { |
186 |
return VMOp_ZMarkEnd; |
|
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187 |
} |
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|
188 |
|
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189 |
virtual bool do_operation() { |
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|
190 |
ZStatTimer timer(ZPhasePauseMarkEnd); |
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|
191 |
ZServiceabilityMarkEndTracer tracer; |
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|
192 |
return ZHeap::heap()->mark_end(); |
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|
193 |
} |
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|
194 |
}; |
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|
195 |
|
53541 | 196 |
class VM_ZRelocateStart : public VM_ZOperation { |
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|
197 |
public: |
53541 | 198 |
virtual VMOp_Type type() const { |
199 |
return VMOp_ZRelocateStart; |
|
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|
200 |
} |
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|
201 |
|
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|
202 |
virtual bool needs_inactive_gc_locker() const { |
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|
203 |
return true; |
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|
204 |
} |
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|
205 |
|
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|
206 |
virtual bool do_operation() { |
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|
207 |
ZStatTimer timer(ZPhasePauseRelocateStart); |
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|
208 |
ZServiceabilityRelocateStartTracer tracer; |
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|
209 |
ZHeap::heap()->relocate_start(); |
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|
210 |
return true; |
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|
211 |
} |
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|
212 |
}; |
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|
213 |
|
58678 | 214 |
class VM_ZVerify : public VM_Operation { |
215 |
public: |
|
216 |
virtual VMOp_Type type() const { |
|
217 |
return VMOp_ZVerify; |
|
218 |
} |
|
219 |
||
220 |
virtual void doit() { |
|
221 |
ZVerify::after_weak_processing(); |
|
222 |
} |
|
223 |
}; |
|
224 |
||
50525
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|
225 |
ZDriver::ZDriver() : |
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|
226 |
_gc_cycle_port(), |
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|
227 |
_gc_locker_port() { |
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|
228 |
set_name("ZDriver"); |
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|
229 |
create_and_start(); |
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|
230 |
} |
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|
231 |
|
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|
232 |
void ZDriver::collect(GCCause::Cause cause) { |
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|
233 |
switch (cause) { |
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|
234 |
case GCCause::_wb_young_gc: |
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|
235 |
case GCCause::_wb_conc_mark: |
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|
236 |
case GCCause::_wb_full_gc: |
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|
237 |
case GCCause::_dcmd_gc_run: |
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|
238 |
case GCCause::_java_lang_system_gc: |
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|
239 |
case GCCause::_full_gc_alot: |
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|
240 |
case GCCause::_scavenge_alot: |
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|
241 |
case GCCause::_jvmti_force_gc: |
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|
242 |
case GCCause::_metadata_GC_clear_soft_refs: |
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|
243 |
// Start synchronous GC |
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|
244 |
_gc_cycle_port.send_sync(cause); |
767cdb97f103
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|
245 |
break; |
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|
246 |
|
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|
247 |
case GCCause::_z_timer: |
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|
248 |
case GCCause::_z_warmup: |
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|
249 |
case GCCause::_z_allocation_rate: |
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|
250 |
case GCCause::_z_allocation_stall: |
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|
251 |
case GCCause::_z_proactive: |
55002 | 252 |
case GCCause::_z_high_usage: |
50525
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|
253 |
case GCCause::_metadata_GC_threshold: |
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|
254 |
// Start asynchronous GC |
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|
255 |
_gc_cycle_port.send_async(cause); |
767cdb97f103
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|
256 |
break; |
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|
257 |
|
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|
258 |
case GCCause::_gc_locker: |
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|
259 |
// Restart VM operation previously blocked by the GC locker |
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|
260 |
_gc_locker_port.signal(); |
767cdb97f103
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|
261 |
break; |
767cdb97f103
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parents:
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|
262 |
|
767cdb97f103
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|
263 |
default: |
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|
264 |
// Other causes not supported |
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|
265 |
fatal("Unsupported GC cause (%s)", GCCause::to_string(cause)); |
767cdb97f103
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|
266 |
break; |
767cdb97f103
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|
267 |
} |
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|
268 |
} |
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|
269 |
|
53541 | 270 |
template <typename T> |
271 |
bool ZDriver::pause() { |
|
272 |
for (;;) { |
|
273 |
T op; |
|
274 |
VMThread::execute(&op); |
|
275 |
if (op.gc_locked()) { |
|
276 |
// Wait for GC to become unlocked and restart the VM operation |
|
277 |
ZStatTimer timer(ZCriticalPhaseGCLockerStall); |
|
278 |
_gc_locker_port.wait(); |
|
279 |
continue; |
|
280 |
} |
|
281 |
||
282 |
// Notify VM operation completed |
|
283 |
_gc_locker_port.ack(); |
|
284 |
||
285 |
return op.success(); |
|
286 |
} |
|
287 |
} |
|
288 |
||
289 |
void ZDriver::pause_mark_start() { |
|
290 |
pause<VM_ZMarkStart>(); |
|
291 |
} |
|
292 |
||
293 |
void ZDriver::concurrent_mark() { |
|
294 |
ZStatTimer timer(ZPhaseConcurrentMark); |
|
295 |
ZHeap::heap()->mark(true /* initial */); |
|
296 |
} |
|
297 |
||
298 |
bool ZDriver::pause_mark_end() { |
|
299 |
return pause<VM_ZMarkEnd>(); |
|
300 |
} |
|
301 |
||
302 |
void ZDriver::concurrent_mark_continue() { |
|
303 |
ZStatTimer timer(ZPhaseConcurrentMarkContinue); |
|
304 |
ZHeap::heap()->mark(false /* initial */); |
|
305 |
} |
|
306 |
||
307 |
void ZDriver::concurrent_process_non_strong_references() { |
|
308 |
ZStatTimer timer(ZPhaseConcurrentProcessNonStrongReferences); |
|
309 |
ZHeap::heap()->process_non_strong_references(); |
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} |
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void ZDriver::concurrent_reset_relocation_set() { |
313 |
ZStatTimer timer(ZPhaseConcurrentResetRelocationSet); |
|
314 |
ZHeap::heap()->reset_relocation_set(); |
|
315 |
} |
|
316 |
||
317 |
void ZDriver::pause_verify() { |
|
318 |
if (VerifyBeforeGC || VerifyDuringGC || VerifyAfterGC) { |
|
58678 | 319 |
// Full verification |
53541 | 320 |
VM_Verify op; |
321 |
VMThread::execute(&op); |
|
58678 | 322 |
} else if (ZVerifyRoots || ZVerifyObjects) { |
323 |
// Limited verification |
|
324 |
VM_ZVerify op; |
|
325 |
VMThread::execute(&op); |
|
53541 | 326 |
} |
327 |
} |
|
328 |
||
329 |
void ZDriver::concurrent_select_relocation_set() { |
|
330 |
ZStatTimer timer(ZPhaseConcurrentSelectRelocationSet); |
|
331 |
ZHeap::heap()->select_relocation_set(); |
|
332 |
} |
|
333 |
||
334 |
void ZDriver::pause_relocate_start() { |
|
335 |
pause<VM_ZRelocateStart>(); |
|
336 |
} |
|
337 |
||
338 |
void ZDriver::concurrent_relocate() { |
|
339 |
ZStatTimer timer(ZPhaseConcurrentRelocated); |
|
340 |
ZHeap::heap()->relocate(); |
|
341 |
} |
|
342 |
||
343 |
void ZDriver::check_out_of_memory() { |
|
344 |
ZHeap::heap()->check_out_of_memory(); |
|
345 |
} |
|
346 |
||
347 |
class ZDriverGCScope : public StackObj { |
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private: |
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GCIdMark _gc_id; |
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GCCauseSetter _gc_cause_setter; |
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ZStatTimer _timer; |
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|
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public: |
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ZDriverGCScope(GCCause::Cause cause) : |
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_gc_id(), |
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_gc_cause_setter(ZCollectedHeap::heap(), cause), |
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_timer(ZPhaseCycle) { |
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// Update statistics |
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ZStatCycle::at_start(); |
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} |
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|
53541 | 362 |
~ZDriverGCScope() { |
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// Calculate boost factor |
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const double boost_factor = (double)ZHeap::heap()->nconcurrent_worker_threads() / |
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(double)ZHeap::heap()->nconcurrent_no_boost_worker_threads(); |
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366 |
|
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// Update statistics |
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ZStatCycle::at_end(boost_factor); |
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369 |
|
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// Update data used by soft reference policy |
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Universe::update_heap_info_at_gc(); |
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} |
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}; |
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374 |
|
53541 | 375 |
void ZDriver::gc(GCCause::Cause cause) { |
376 |
ZDriverGCScope scope(cause); |
|
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377 |
|
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// Phase 1: Pause Mark Start |
53541 | 379 |
pause_mark_start(); |
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380 |
|
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381 |
// Phase 2: Concurrent Mark |
53541 | 382 |
concurrent_mark(); |
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383 |
|
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384 |
// Phase 3: Pause Mark End |
53541 | 385 |
while (!pause_mark_end()) { |
386 |
// Phase 3.5: Concurrent Mark Continue |
|
387 |
concurrent_mark_continue(); |
|
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} |
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|
389 |
|
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390 |
// Phase 4: Concurrent Process Non-Strong References |
53541 | 391 |
concurrent_process_non_strong_references(); |
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|
392 |
|
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393 |
// Phase 5: Concurrent Reset Relocation Set |
53541 | 394 |
concurrent_reset_relocation_set(); |
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395 |
|
54174 | 396 |
// Phase 6: Pause Verify |
53541 | 397 |
pause_verify(); |
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398 |
|
54174 | 399 |
// Phase 7: Concurrent Select Relocation Set |
53541 | 400 |
concurrent_select_relocation_set(); |
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401 |
|
54174 | 402 |
// Phase 8: Pause Relocate Start |
53541 | 403 |
pause_relocate_start(); |
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404 |
|
54174 | 405 |
// Phase 9: Concurrent Relocate |
53541 | 406 |
concurrent_relocate(); |
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407 |
} |
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|
408 |
|
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409 |
void ZDriver::run_service() { |
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410 |
// Main loop |
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411 |
while (!should_terminate()) { |
53541 | 412 |
// Wait for GC request |
413 |
const GCCause::Cause cause = _gc_cycle_port.receive(); |
|
414 |
if (cause == GCCause::_no_gc) { |
|
415 |
continue; |
|
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} |
53541 | 417 |
|
418 |
// Run GC |
|
419 |
gc(cause); |
|
420 |
||
421 |
// Notify GC completed |
|
422 |
_gc_cycle_port.ack(); |
|
423 |
||
424 |
// Check for out of memory condition |
|
425 |
check_out_of_memory(); |
|
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426 |
} |
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|
427 |
} |
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|
428 |
|
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429 |
void ZDriver::stop_service() { |
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430 |
_gc_cycle_port.send_async(GCCause::_no_gc); |
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431 |
} |