author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 20309 | 7445302daff6 |
child 22234 | da823d78ad65 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2012, 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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|
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP |
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#include "gc_implementation/g1/concurrentMark.inline.hpp" |
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#include "gc_implementation/g1/dirtyCardQueue.hpp" |
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#include "gc_implementation/g1/g1CollectedHeap.inline.hpp" |
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#include "gc_implementation/g1/g1_globals.hpp" |
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#include "gc_implementation/g1/g1OopClosures.inline.hpp" |
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#include "gc_implementation/g1/heapRegion.hpp" |
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#include "gc_implementation/g1/heapRegionRemSet.hpp" |
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#include "utilities/workgroup.hpp" |
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// Closures and tasks associated with any self-forwarding pointers |
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// installed as a result of an evacuation failure. |
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class UpdateRSetDeferred : public OopsInHeapRegionClosure { |
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private: |
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G1CollectedHeap* _g1; |
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DirtyCardQueue *_dcq; |
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G1SATBCardTableModRefBS* _ct_bs; |
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|
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public: |
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UpdateRSetDeferred(G1CollectedHeap* g1, DirtyCardQueue* dcq) : |
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_g1(g1), _ct_bs(_g1->g1_barrier_set()), _dcq(dcq) {} |
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virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
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virtual void do_oop( oop* p) { do_oop_work(p); } |
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template <class T> void do_oop_work(T* p) { |
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assert(_from->is_in_reserved(p), "paranoia"); |
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if (!_from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && |
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!_from->is_survivor()) { |
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size_t card_index = _ct_bs->index_for(p); |
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if (_ct_bs->mark_card_deferred(card_index)) { |
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_dcq->enqueue((jbyte*)_ct_bs->byte_for_index(card_index)); |
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} |
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} |
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} |
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}; |
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class RemoveSelfForwardPtrObjClosure: public ObjectClosure { |
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private: |
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G1CollectedHeap* _g1; |
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ConcurrentMark* _cm; |
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HeapRegion* _hr; |
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size_t _marked_bytes; |
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OopsInHeapRegionClosure *_update_rset_cl; |
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bool _during_initial_mark; |
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bool _during_conc_mark; |
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uint _worker_id; |
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public: |
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RemoveSelfForwardPtrObjClosure(G1CollectedHeap* g1, ConcurrentMark* cm, |
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HeapRegion* hr, |
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OopsInHeapRegionClosure* update_rset_cl, |
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bool during_initial_mark, |
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bool during_conc_mark, |
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uint worker_id) : |
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_g1(g1), _cm(cm), _hr(hr), _marked_bytes(0), |
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_update_rset_cl(update_rset_cl), |
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_during_initial_mark(during_initial_mark), |
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_during_conc_mark(during_conc_mark), |
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_worker_id(worker_id) { } |
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size_t marked_bytes() { return _marked_bytes; } |
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// <original comment> |
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// The original idea here was to coalesce evacuated and dead objects. |
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// However that caused complications with the block offset table (BOT). |
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// In particular if there were two TLABs, one of them partially refined. |
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// |----- TLAB_1--------|----TLAB_2-~~~(partially refined part)~~~| |
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// The BOT entries of the unrefined part of TLAB_2 point to the start |
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// of TLAB_2. If the last object of the TLAB_1 and the first object |
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// of TLAB_2 are coalesced, then the cards of the unrefined part |
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// would point into middle of the filler object. |
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// The current approach is to not coalesce and leave the BOT contents intact. |
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// </original comment> |
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// |
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// We now reset the BOT when we start the object iteration over the |
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// region and refine its entries for every object we come across. So |
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// the above comment is not really relevant and we should be able |
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// to coalesce dead objects if we want to. |
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void do_object(oop obj) { |
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HeapWord* obj_addr = (HeapWord*) obj; |
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assert(_hr->is_in(obj_addr), "sanity"); |
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size_t obj_size = obj->size(); |
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_hr->update_bot_for_object(obj_addr, obj_size); |
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if (obj->is_forwarded() && obj->forwardee() == obj) { |
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// The object failed to move. |
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// We consider all objects that we find self-forwarded to be |
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// live. What we'll do is that we'll update the prev marking |
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// info so that they are all under PTAMS and explicitly marked. |
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_cm->markPrev(obj); |
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if (_during_initial_mark) { |
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// For the next marking info we'll only mark the |
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// self-forwarded objects explicitly if we are during |
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// initial-mark (since, normally, we only mark objects pointed |
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// to by roots if we succeed in copying them). By marking all |
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// self-forwarded objects we ensure that we mark any that are |
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// still pointed to be roots. During concurrent marking, and |
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// after initial-mark, we don't need to mark any objects |
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// explicitly and all objects in the CSet are considered |
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// (implicitly) live. So, we won't mark them explicitly and |
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// we'll leave them over NTAMS. |
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_cm->grayRoot(obj, obj_size, _worker_id, _hr); |
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} |
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_marked_bytes += (obj_size * HeapWordSize); |
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obj->set_mark(markOopDesc::prototype()); |
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|
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// While we were processing RSet buffers during the collection, |
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// we actually didn't scan any cards on the collection set, |
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// since we didn't want to update remembered sets with entries |
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// that point into the collection set, given that live objects |
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// from the collection set are about to move and such entries |
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// will be stale very soon. |
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// This change also dealt with a reliability issue which |
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// involved scanning a card in the collection set and coming |
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// across an array that was being chunked and looking malformed. |
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// The problem is that, if evacuation fails, we might have |
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// remembered set entries missing given that we skipped cards on |
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// the collection set. So, we'll recreate such entries now. |
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obj->oop_iterate(_update_rset_cl); |
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assert(_cm->isPrevMarked(obj), "Should be marked!"); |
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} else { |
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// The object has been either evacuated or is dead. Fill it with a |
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// dummy object. |
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MemRegion mr((HeapWord*) obj, obj_size); |
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CollectedHeap::fill_with_object(mr); |
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} |
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} |
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}; |
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class RemoveSelfForwardPtrHRClosure: public HeapRegionClosure { |
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G1CollectedHeap* _g1h; |
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ConcurrentMark* _cm; |
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OopsInHeapRegionClosure *_update_rset_cl; |
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uint _worker_id; |
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|
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public: |
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RemoveSelfForwardPtrHRClosure(G1CollectedHeap* g1h, |
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OopsInHeapRegionClosure* update_rset_cl, |
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uint worker_id) : |
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_g1h(g1h), _update_rset_cl(update_rset_cl), |
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_worker_id(worker_id), _cm(_g1h->concurrent_mark()) { } |
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|
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bool doHeapRegion(HeapRegion *hr) { |
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bool during_initial_mark = _g1h->g1_policy()->during_initial_mark_pause(); |
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bool during_conc_mark = _g1h->mark_in_progress(); |
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|
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assert(!hr->isHumongous(), "sanity"); |
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assert(hr->in_collection_set(), "bad CS"); |
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|
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if (hr->claimHeapRegion(HeapRegion::ParEvacFailureClaimValue)) { |
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if (hr->evacuation_failed()) { |
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RemoveSelfForwardPtrObjClosure rspc(_g1h, _cm, hr, _update_rset_cl, |
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during_initial_mark, |
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during_conc_mark, |
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_worker_id); |
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|
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MemRegion mr(hr->bottom(), hr->end()); |
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// We'll recreate the prev marking info so we'll first clear |
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// the prev bitmap range for this region. We never mark any |
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// CSet objects explicitly so the next bitmap range should be |
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// cleared anyway. |
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_cm->clearRangePrevBitmap(mr); |
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191 |
|
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hr->note_self_forwarding_removal_start(during_initial_mark, |
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during_conc_mark); |
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|
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// In the common case (i.e. when there is no evacuation |
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// failure) we make sure that the following is done when |
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// the region is freed so that it is "ready-to-go" when it's |
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// re-allocated. However, when evacuation failure happens, a |
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// region will remain in the heap and might ultimately be added |
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// to a CSet in the future. So we have to be careful here and |
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// make sure the region's RSet is ready for parallel iteration |
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// whenever this might be required in the future. |
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hr->rem_set()->reset_for_par_iteration(); |
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hr->reset_bot(); |
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_update_rset_cl->set_region(hr); |
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hr->object_iterate(&rspc); |
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|
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hr->note_self_forwarding_removal_end(during_initial_mark, |
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during_conc_mark, |
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rspc.marked_bytes()); |
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} |
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} |
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return false; |
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} |
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}; |
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|
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class G1ParRemoveSelfForwardPtrsTask: public AbstractGangTask { |
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protected: |
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G1CollectedHeap* _g1h; |
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|
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public: |
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G1ParRemoveSelfForwardPtrsTask(G1CollectedHeap* g1h) : |
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AbstractGangTask("G1 Remove Self-forwarding Pointers"), |
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_g1h(g1h) { } |
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|
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void work(uint worker_id) { |
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UpdateRSetImmediate immediate_update(_g1h->g1_rem_set()); |
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DirtyCardQueue dcq(&_g1h->dirty_card_queue_set()); |
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UpdateRSetDeferred deferred_update(_g1h, &dcq); |
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|
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OopsInHeapRegionClosure *update_rset_cl = &deferred_update; |
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if (!G1DeferredRSUpdate) { |
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update_rset_cl = &immediate_update; |
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} |
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RemoveSelfForwardPtrHRClosure rsfp_cl(_g1h, update_rset_cl, worker_id); |
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|
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HeapRegion* hr = _g1h->start_cset_region_for_worker(worker_id); |
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_g1h->collection_set_iterate_from(hr, &rsfp_cl); |
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} |
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}; |
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7121496: G1: do the per-region evacuation failure handling work in parallel
johnc
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1EVACFAILURE_HPP |