0f583c7817
Regularly try to drain task queues. This helps memory usage and performance during garbage collection. Reviewed-by: sjohanss, sangheki
227 lines
7.6 KiB
C++
227 lines
7.6 KiB
C++
/*
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* Copyright (c) 2001, 2018, 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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#ifndef SHARE_VM_GC_G1_G1OOPCLOSURES_HPP
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#define SHARE_VM_GC_G1_G1OOPCLOSURES_HPP
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#include "gc/g1/g1InCSetState.hpp"
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#include "memory/iterator.hpp"
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#include "oops/markOop.hpp"
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class HeapRegion;
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class G1CollectedHeap;
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class G1RemSet;
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class G1ConcurrentMark;
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class DirtyCardToOopClosure;
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class G1CMBitMap;
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class G1ParScanThreadState;
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class G1CMTask;
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class ReferenceProcessor;
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class G1ScanClosureBase : public ExtendedOopClosure {
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protected:
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G1CollectedHeap* _g1h;
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G1ParScanThreadState* _par_scan_state;
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HeapRegion* _from;
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G1ScanClosureBase(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state);
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~G1ScanClosureBase() { }
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template <class T>
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inline void prefetch_and_push(T* p, oop const obj);
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template <class T>
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inline void handle_non_cset_obj_common(InCSetState const state, T* p, oop const obj);
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public:
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// This closure needs special handling for InstanceRefKlass.
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virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
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void set_region(HeapRegion* from) { _from = from; }
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inline void trim_queue_partially();
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};
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// Used during the Update RS phase to refine remaining cards in the DCQ during garbage collection.
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class G1ScanObjsDuringUpdateRSClosure: public G1ScanClosureBase {
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uint _worker_i;
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public:
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G1ScanObjsDuringUpdateRSClosure(G1CollectedHeap* g1h,
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G1ParScanThreadState* pss,
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uint worker_i) :
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G1ScanClosureBase(g1h, pss), _worker_i(worker_i) { }
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template <class T> void do_oop_nv(T* p);
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virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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virtual void do_oop(oop* p) { do_oop_nv(p); }
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};
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// Used during the Scan RS phase to scan cards from the remembered set during garbage collection.
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class G1ScanObjsDuringScanRSClosure : public G1ScanClosureBase {
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public:
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G1ScanObjsDuringScanRSClosure(G1CollectedHeap* g1h,
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G1ParScanThreadState* par_scan_state):
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G1ScanClosureBase(g1h, par_scan_state) { }
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template <class T> void do_oop_nv(T* p);
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virtual void do_oop(oop* p) { do_oop_nv(p); }
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virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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};
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// This closure is applied to the fields of the objects that have just been copied during evacuation.
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class G1ScanEvacuatedObjClosure : public G1ScanClosureBase {
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public:
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G1ScanEvacuatedObjClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
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G1ScanClosureBase(g1h, par_scan_state) { }
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template <class T> void do_oop_nv(T* p);
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virtual void do_oop(oop* p) { do_oop_nv(p); }
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virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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void set_ref_discoverer(ReferenceDiscoverer* rd) {
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set_ref_discoverer_internal(rd);
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}
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};
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// Add back base class for metadata
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class G1ParCopyHelper : public OopClosure {
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protected:
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G1CollectedHeap* _g1h;
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G1ParScanThreadState* _par_scan_state;
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uint _worker_id; // Cache value from par_scan_state.
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ClassLoaderData* _scanned_cld;
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G1ConcurrentMark* _cm;
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// Mark the object if it's not already marked. This is used to mark
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// objects pointed to by roots that are guaranteed not to move
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// during the GC (i.e., non-CSet objects). It is MT-safe.
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inline void mark_object(oop obj);
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// Mark the object if it's not already marked. This is used to mark
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// objects pointed to by roots that have been forwarded during a
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// GC. It is MT-safe.
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inline void mark_forwarded_object(oop from_obj, oop to_obj);
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G1ParCopyHelper(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state);
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~G1ParCopyHelper() { }
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public:
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void set_scanned_cld(ClassLoaderData* cld) { _scanned_cld = cld; }
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inline void do_cld_barrier(oop new_obj);
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inline void trim_queue_partially();
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};
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enum G1Barrier {
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G1BarrierNone,
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G1BarrierCLD
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};
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enum G1Mark {
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G1MarkNone,
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G1MarkFromRoot,
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G1MarkPromotedFromRoot
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};
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template <G1Barrier barrier, G1Mark do_mark_object>
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class G1ParCopyClosure : public G1ParCopyHelper {
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public:
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G1ParCopyClosure(G1CollectedHeap* g1h, G1ParScanThreadState* par_scan_state) :
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G1ParCopyHelper(g1h, par_scan_state) { }
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template <class T> void do_oop_work(T* p);
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virtual void do_oop(oop* p) { do_oop_work(p); }
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virtual void do_oop(narrowOop* p) { do_oop_work(p); }
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};
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class G1CLDScanClosure : public CLDClosure {
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G1ParCopyHelper* _closure;
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bool _process_only_dirty;
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bool _must_claim;
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int _count;
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public:
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G1CLDScanClosure(G1ParCopyHelper* closure,
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bool process_only_dirty, bool must_claim)
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: _process_only_dirty(process_only_dirty), _must_claim(must_claim), _closure(closure), _count(0) {}
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void do_cld(ClassLoaderData* cld);
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};
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// Closure for iterating over object fields during concurrent marking
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class G1CMOopClosure : public MetadataAwareOopClosure {
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G1CollectedHeap* _g1h;
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G1CMTask* _task;
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public:
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G1CMOopClosure(G1CollectedHeap* g1h,G1CMTask* task);
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template <class T> void do_oop_nv(T* p);
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virtual void do_oop( oop* p) { do_oop_nv(p); }
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virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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};
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// Closure to scan the root regions during concurrent marking
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class G1RootRegionScanClosure : public MetadataAwareOopClosure {
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private:
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G1CollectedHeap* _g1h;
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G1ConcurrentMark* _cm;
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uint _worker_id;
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public:
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G1RootRegionScanClosure(G1CollectedHeap* g1h, G1ConcurrentMark* cm, uint worker_id) :
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_g1h(g1h), _cm(cm), _worker_id(worker_id) { }
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template <class T> void do_oop_nv(T* p);
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virtual void do_oop( oop* p) { do_oop_nv(p); }
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virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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};
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class G1ConcurrentRefineOopClosure: public ExtendedOopClosure {
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G1CollectedHeap* _g1h;
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uint _worker_i;
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public:
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G1ConcurrentRefineOopClosure(G1CollectedHeap* g1h, uint worker_i) :
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_g1h(g1h),
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_worker_i(worker_i) {
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}
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// This closure needs special handling for InstanceRefKlass.
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virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
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template <class T> void do_oop_nv(T* p);
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virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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virtual void do_oop(oop* p) { do_oop_nv(p); }
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};
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class G1RebuildRemSetClosure : public ExtendedOopClosure {
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G1CollectedHeap* _g1h;
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uint _worker_id;
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public:
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G1RebuildRemSetClosure(G1CollectedHeap* g1h, uint worker_id) : _g1h(g1h), _worker_id(worker_id) {
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}
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template <class T> void do_oop_nv(T* p);
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virtual void do_oop(oop* p) { do_oop_nv(p); }
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virtual void do_oop(narrowOop* p) { do_oop_nv(p); }
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// This closure needs special handling for InstanceRefKlass.
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virtual ReferenceIterationMode reference_iteration_mode() { return DO_DISCOVERED_AND_DISCOVERY; }
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};
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#endif // SHARE_VM_GC_G1_G1OOPCLOSURES_HPP
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