author | sjohanss |
Tue, 09 Sep 2014 00:05:25 +0200 | |
changeset 26839 | 021bfc544c6f |
parent 26837 | 72a43d3841e7 |
child 26846 | 7d4376f8560e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2014, 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_HEAPREGION_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |
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#include "gc_implementation/g1/g1AllocationContext.hpp" |
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#include "gc_implementation/g1/g1BlockOffsetTable.hpp" |
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#include "gc_implementation/g1/g1_specialized_oop_closures.hpp" |
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#include "gc_implementation/g1/heapRegionType.hpp" |
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#include "gc_implementation/g1/survRateGroup.hpp" |
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#include "gc_implementation/shared/ageTable.hpp" |
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#include "gc_implementation/shared/spaceDecorator.hpp" |
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#include "memory/space.inline.hpp" |
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#include "memory/watermark.hpp" |
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#include "utilities/macros.hpp" |
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// A HeapRegion is the smallest piece of a G1CollectedHeap that |
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// can be collected independently. |
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// NOTE: Although a HeapRegion is a Space, its |
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// Space::initDirtyCardClosure method must not be called. |
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// The problem is that the existence of this method breaks |
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// the independence of barrier sets from remembered sets. |
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// The solution is to remove this method from the definition |
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// of a Space. |
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class HeapRegionRemSet; |
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class HeapRegionRemSetIterator; |
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class HeapRegion; |
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class HeapRegionSetBase; |
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class nmethod; |
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#define HR_FORMAT "%u:(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
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#define HR_FORMAT_PARAMS(_hr_) \ |
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(_hr_)->hrm_index(), \ |
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(_hr_)->get_short_type_str(), \ |
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p2i((_hr_)->bottom()), p2i((_hr_)->top()), p2i((_hr_)->end()) |
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// sentinel value for hrm_index |
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#define G1_NO_HRM_INDEX ((uint) -1) |
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// A dirty card to oop closure for heap regions. It |
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// knows how to get the G1 heap and how to use the bitmap |
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// in the concurrent marker used by G1 to filter remembered |
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// sets. |
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class HeapRegionDCTOC : public DirtyCardToOopClosure { |
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public: |
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// Specification of possible DirtyCardToOopClosure filtering. |
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enum FilterKind { |
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NoFilterKind, |
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IntoCSFilterKind, |
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OutOfRegionFilterKind |
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}; |
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protected: |
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HeapRegion* _hr; |
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FilterKind _fk; |
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G1CollectedHeap* _g1; |
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// Walk the given memory region from bottom to (actual) top |
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// looking for objects and applying the oop closure (_cl) to |
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// them. The base implementation of this treats the area as |
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// blocks, where a block may or may not be an object. Sub- |
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// classes should override this to provide more accurate |
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// or possibly more efficient walking. |
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void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top); |
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public: |
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HeapRegionDCTOC(G1CollectedHeap* g1, |
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HeapRegion* hr, ExtendedOopClosure* cl, |
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CardTableModRefBS::PrecisionStyle precision, |
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FilterKind fk); |
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}; |
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// The complicating factor is that BlockOffsetTable diverged |
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// significantly, and we need functionality that is only in the G1 version. |
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// So I copied that code, which led to an alternate G1 version of |
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// OffsetTableContigSpace. If the two versions of BlockOffsetTable could |
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// be reconciled, then G1OffsetTableContigSpace could go away. |
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// The idea behind time stamps is the following. Doing a save_marks on |
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// all regions at every GC pause is time consuming (if I remember |
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// well, 10ms or so). So, we would like to do that only for regions |
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// that are GC alloc regions. To achieve this, we use time |
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// stamps. For every evacuation pause, G1CollectedHeap generates a |
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// unique time stamp (essentially a counter that gets |
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// incremented). Every time we want to call save_marks on a region, |
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// we set the saved_mark_word to top and also copy the current GC |
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// time stamp to the time stamp field of the space. Reading the |
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// saved_mark_word involves checking the time stamp of the |
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// region. If it is the same as the current GC time stamp, then we |
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// can safely read the saved_mark_word field, as it is valid. If the |
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// time stamp of the region is not the same as the current GC time |
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// stamp, then we instead read top, as the saved_mark_word field is |
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// invalid. Time stamps (on the regions and also on the |
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// G1CollectedHeap) are reset at every cleanup (we iterate over |
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// the regions anyway) and at the end of a Full GC. The current scheme |
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// that uses sequential unsigned ints will fail only if we have 4b |
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// evacuation pauses between two cleanups, which is _highly_ unlikely. |
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class G1OffsetTableContigSpace: public CompactibleSpace { |
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friend class VMStructs; |
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HeapWord* _top; |
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protected: |
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G1BlockOffsetArrayContigSpace _offsets; |
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Mutex _par_alloc_lock; |
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volatile unsigned _gc_time_stamp; |
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// When we need to retire an allocation region, while other threads |
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// are also concurrently trying to allocate into it, we typically |
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// allocate a dummy object at the end of the region to ensure that |
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// no more allocations can take place in it. However, sometimes we |
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// want to know where the end of the last "real" object we allocated |
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// into the region was and this is what this keeps track. |
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HeapWord* _pre_dummy_top; |
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public: |
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G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, |
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MemRegion mr); |
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void set_top(HeapWord* value) { _top = value; } |
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HeapWord* top() const { return _top; } |
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protected: |
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// Reset the G1OffsetTableContigSpace. |
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virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
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HeapWord** top_addr() { return &_top; } |
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// Allocation helpers (return NULL if full). |
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inline HeapWord* allocate_impl(size_t word_size, HeapWord* end_value); |
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inline HeapWord* par_allocate_impl(size_t word_size, HeapWord* end_value); |
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public: |
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void reset_after_compaction() { set_top(compaction_top()); } |
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size_t used() const { return byte_size(bottom(), top()); } |
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size_t free() const { return byte_size(top(), end()); } |
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bool is_free_block(const HeapWord* p) const { return p >= top(); } |
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MemRegion used_region() const { return MemRegion(bottom(), top()); } |
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void object_iterate(ObjectClosure* blk); |
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void safe_object_iterate(ObjectClosure* blk); |
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void set_bottom(HeapWord* value); |
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void set_end(HeapWord* value); |
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virtual HeapWord* saved_mark_word() const; |
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void record_top_and_timestamp(); |
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void reset_gc_time_stamp() { _gc_time_stamp = 0; } |
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unsigned get_gc_time_stamp() { return _gc_time_stamp; } |
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// See the comment above in the declaration of _pre_dummy_top for an |
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// explanation of what it is. |
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void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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_pre_dummy_top = pre_dummy_top; |
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} |
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HeapWord* pre_dummy_top() { |
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return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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} |
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void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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virtual void clear(bool mangle_space); |
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HeapWord* block_start(const void* p); |
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HeapWord* block_start_const(const void* p) const; |
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void prepare_for_compaction(CompactPoint* cp); |
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// Add offset table update. |
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virtual HeapWord* allocate(size_t word_size); |
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HeapWord* par_allocate(size_t word_size); |
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// MarkSweep support phase3 |
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virtual HeapWord* initialize_threshold(); |
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virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); |
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virtual void print() const; |
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void reset_bot() { |
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_offsets.reset_bot(); |
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} |
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void print_bot_on(outputStream* out) { |
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_offsets.print_on(out); |
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} |
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}; |
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class HeapRegion: public G1OffsetTableContigSpace { |
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friend class VMStructs; |
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private: |
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// The remembered set for this region. |
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// (Might want to make this "inline" later, to avoid some alloc failure |
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// issues.) |
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HeapRegionRemSet* _rem_set; |
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G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } |
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221 |
||
222 |
protected: |
|
9989 | 223 |
// The index of this region in the heap region sequence. |
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uint _hrm_index; |
1374 | 225 |
|
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226 |
AllocationContext_t _allocation_context; |
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227 |
|
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228 |
HeapRegionType _type; |
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229 |
|
1374 | 230 |
// For a humongous region, region in which it starts. |
231 |
HeapRegion* _humongous_start_region; |
|
232 |
// True iff the region is in current collection_set. |
|
233 |
bool _in_collection_set; |
|
234 |
||
235 |
// True iff an attempt to evacuate an object in the region failed. |
|
236 |
bool _evacuation_failed; |
|
237 |
||
238 |
// A heap region may be a member one of a number of special subsets, each |
|
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239 |
// represented as linked lists through the field below. Currently, there |
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240 |
// is only one set: |
1374 | 241 |
// The collection set. |
242 |
HeapRegion* _next_in_special_set; |
|
243 |
||
244 |
// next region in the young "generation" region set |
|
245 |
HeapRegion* _next_young_region; |
|
246 |
||
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// Next region whose cards need cleaning |
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248 |
HeapRegion* _next_dirty_cards_region; |
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249 |
|
7923 | 250 |
// Fields used by the HeapRegionSetBase class and subclasses. |
251 |
HeapRegion* _next; |
|
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252 |
HeapRegion* _prev; |
7923 | 253 |
#ifdef ASSERT |
254 |
HeapRegionSetBase* _containing_set; |
|
255 |
#endif // ASSERT |
|
256 |
||
1374 | 257 |
// For parallel heapRegion traversal. |
258 |
jint _claimed; |
|
259 |
||
260 |
// We use concurrent marking to determine the amount of live data |
|
261 |
// in each heap region. |
|
262 |
size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. |
|
263 |
size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. |
|
264 |
||
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// The calculated GC efficiency of the region. |
1374 | 266 |
double _gc_efficiency; |
267 |
||
268 |
int _young_index_in_cset; |
|
269 |
SurvRateGroup* _surv_rate_group; |
|
270 |
int _age_index; |
|
271 |
||
272 |
// The start of the unmarked area. The unmarked area extends from this |
|
273 |
// word until the top and/or end of the region, and is the part |
|
274 |
// of the region for which no marking was done, i.e. objects may |
|
275 |
// have been allocated in this part since the last mark phase. |
|
276 |
// "prev" is the top at the start of the last completed marking. |
|
277 |
// "next" is the top at the start of the in-progress marking (if any.) |
|
278 |
HeapWord* _prev_top_at_mark_start; |
|
279 |
HeapWord* _next_top_at_mark_start; |
|
280 |
// If a collection pause is in progress, this is the top at the start |
|
281 |
// of that pause. |
|
282 |
||
283 |
void init_top_at_mark_start() { |
|
284 |
assert(_prev_marked_bytes == 0 && |
|
285 |
_next_marked_bytes == 0, |
|
286 |
"Must be called after zero_marked_bytes."); |
|
287 |
HeapWord* bot = bottom(); |
|
288 |
_prev_top_at_mark_start = bot; |
|
289 |
_next_top_at_mark_start = bot; |
|
290 |
} |
|
291 |
||
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|
292 |
// Cached attributes used in the collection set policy information |
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|
293 |
|
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|
294 |
// The RSet length that was added to the total value |
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|
295 |
// for the collection set. |
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|
296 |
size_t _recorded_rs_length; |
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|
297 |
|
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|
298 |
// The predicted elapsed time that was added to total value |
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|
299 |
// for the collection set. |
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|
300 |
double _predicted_elapsed_time_ms; |
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|
301 |
|
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|
302 |
// The predicted number of bytes to copy that was added to |
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|
303 |
// the total value for the collection set. |
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|
304 |
size_t _predicted_bytes_to_copy; |
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|
305 |
|
1374 | 306 |
public: |
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|
307 |
HeapRegion(uint hrm_index, |
9989 | 308 |
G1BlockOffsetSharedArray* sharedOffsetArray, |
26839 | 309 |
MemRegion mr); |
1374 | 310 |
|
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|
311 |
// Initializing the HeapRegion not only resets the data structure, but also |
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|
312 |
// resets the BOT for that heap region. |
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|
313 |
// The default values for clear_space means that we will do the clearing if |
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|
314 |
// there's clearing to be done ourselves. We also always mangle the space. |
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|
315 |
virtual void initialize(MemRegion mr, bool clear_space = false, bool mangle_space = SpaceDecorator::Mangle); |
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|
316 |
|
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|
317 |
static int LogOfHRGrainBytes; |
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|
318 |
static int LogOfHRGrainWords; |
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|
319 |
|
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|
320 |
static size_t GrainBytes; |
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changeset
|
321 |
static size_t GrainWords; |
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changeset
|
322 |
static size_t CardsPerRegion; |
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|
323 |
|
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|
324 |
static size_t align_up_to_region_byte_size(size_t sz) { |
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|
325 |
return (sz + (size_t) GrainBytes - 1) & |
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|
326 |
~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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|
327 |
} |
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changeset
|
328 |
|
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|
329 |
static size_t max_region_size(); |
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|
330 |
|
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|
331 |
// It sets up the heap region size (GrainBytes / GrainWords), as |
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|
332 |
// well as other related fields that are based on the heap region |
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diff
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|
333 |
// size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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diff
changeset
|
334 |
// CardsPerRegion). All those fields are considered constant |
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diff
changeset
|
335 |
// throughout the JVM's execution, therefore they should only be set |
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|
336 |
// up once during initialization time. |
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|
337 |
static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size); |
1374 | 338 |
|
1387 | 339 |
enum ClaimValues { |
11176
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|
340 |
InitialClaimValue = 0, |
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|
341 |
FinalCountClaimValue = 1, |
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|
342 |
NoteEndClaimValue = 2, |
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changeset
|
343 |
ScrubRemSetClaimValue = 3, |
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|
344 |
ParVerifyClaimValue = 4, |
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|
345 |
RebuildRSClaimValue = 5, |
12272
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|
346 |
ParEvacFailureClaimValue = 6, |
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diff
changeset
|
347 |
AggregateCountClaimValue = 7, |
19339 | 348 |
VerifyCountClaimValue = 8, |
349 |
ParMarkRootClaimValue = 9 |
|
1387 | 350 |
}; |
351 |
||
25481
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diff
changeset
|
352 |
// All allocated blocks are occupied by objects in a HeapRegion |
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diff
changeset
|
353 |
bool block_is_obj(const HeapWord* p) const; |
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diff
changeset
|
354 |
|
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diff
changeset
|
355 |
// Returns the object size for all valid block starts |
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diff
changeset
|
356 |
// and the amount of unallocated words if called on top() |
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diff
changeset
|
357 |
size_t block_size(const HeapWord* p) const; |
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diff
changeset
|
358 |
|
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diff
changeset
|
359 |
inline HeapWord* par_allocate_no_bot_updates(size_t word_size); |
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diff
changeset
|
360 |
inline HeapWord* allocate_no_bot_updates(size_t word_size); |
7905
cc7740616b03
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diff
changeset
|
361 |
|
26316
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8054819: Rename HeapRegionSeq to HeapRegionManager
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diff
changeset
|
362 |
// If this region is a member of a HeapRegionManager, the index in that |
1374 | 363 |
// sequence, otherwise -1. |
26316
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diff
changeset
|
364 |
uint hrm_index() const { return _hrm_index; } |
1374 | 365 |
|
366 |
// The number of bytes marked live in the region in the last marking phase. |
|
367 |
size_t marked_bytes() { return _prev_marked_bytes; } |
|
8930
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|
368 |
size_t live_bytes() { |
52368505ee8e
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changeset
|
369 |
return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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changeset
|
370 |
} |
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diff
changeset
|
371 |
|
1374 | 372 |
// The number of bytes counted in the next marking. |
373 |
size_t next_marked_bytes() { return _next_marked_bytes; } |
|
374 |
// The number of bytes live wrt the next marking. |
|
375 |
size_t next_live_bytes() { |
|
8930
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|
376 |
return |
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diff
changeset
|
377 |
(top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
1374 | 378 |
} |
379 |
||
380 |
// A lower bound on the amount of garbage bytes in the region. |
|
381 |
size_t garbage_bytes() { |
|
382 |
size_t used_at_mark_start_bytes = |
|
383 |
(prev_top_at_mark_start() - bottom()) * HeapWordSize; |
|
384 |
assert(used_at_mark_start_bytes >= marked_bytes(), |
|
385 |
"Can't mark more than we have."); |
|
386 |
return used_at_mark_start_bytes - marked_bytes(); |
|
387 |
} |
|
388 |
||
11756
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diff
changeset
|
389 |
// Return the amount of bytes we'll reclaim if we collect this |
28b6fe22e43d
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diff
changeset
|
390 |
// region. This includes not only the known garbage bytes in the |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
391 |
// region but also any unallocated space in it, i.e., [top, end), |
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7132029: G1: mixed GC phase lasts for longer than it should
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parents:
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diff
changeset
|
392 |
// since it will also be reclaimed if we collect the region. |
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7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
393 |
size_t reclaimable_bytes() { |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
394 |
size_t known_live_bytes = live_bytes(); |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
395 |
assert(known_live_bytes <= capacity(), "sanity"); |
28b6fe22e43d
7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
396 |
return capacity() - known_live_bytes; |
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7132029: G1: mixed GC phase lasts for longer than it should
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diff
changeset
|
397 |
} |
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7132029: G1: mixed GC phase lasts for longer than it should
tonyp
parents:
11583
diff
changeset
|
398 |
|
1374 | 399 |
// An upper bound on the number of live bytes in the region. |
400 |
size_t max_live_bytes() { return used() - garbage_bytes(); } |
|
401 |
||
402 |
void add_to_marked_bytes(size_t incr_bytes) { |
|
403 |
_next_marked_bytes = _next_marked_bytes + incr_bytes; |
|
11172
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7111795: G1: Various cleanups identified during walk through of changes for 6484965
johnc
parents:
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diff
changeset
|
404 |
assert(_next_marked_bytes <= used(), "invariant" ); |
1374 | 405 |
} |
406 |
||
407 |
void zero_marked_bytes() { |
|
408 |
_prev_marked_bytes = _next_marked_bytes = 0; |
|
409 |
} |
|
410 |
||
26696
623a25e6c686
8057768: Make heap region region type in G1 HeapRegion explicit
tonyp
parents:
26422
diff
changeset
|
411 |
const char* get_type_str() const { return _type.get_str(); } |
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|
412 |
const char* get_short_type_str() const { return _type.get_short_str(); } |
623a25e6c686
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|
413 |
|
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changeset
|
414 |
bool is_free() const { return _type.is_free(); } |
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changeset
|
415 |
|
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changeset
|
416 |
bool is_young() const { return _type.is_young(); } |
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|
417 |
bool is_eden() const { return _type.is_eden(); } |
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|
418 |
bool is_survivor() const { return _type.is_survivor(); } |
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changeset
|
419 |
|
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|
420 |
bool isHumongous() const { return _type.is_humongous(); } |
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|
421 |
bool startsHumongous() const { return _type.is_starts_humongous(); } |
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|
422 |
bool continuesHumongous() const { return _type.is_continues_humongous(); } |
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changeset
|
423 |
|
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changeset
|
424 |
bool is_old() const { return _type.is_old(); } |
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|
425 |
|
1374 | 426 |
// For a humongous region, region in which it starts. |
427 |
HeapRegion* humongous_start_region() const { |
|
428 |
return _humongous_start_region; |
|
429 |
} |
|
430 |
||
13336
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|
431 |
// Return the number of distinct regions that are covered by this region: |
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|
432 |
// 1 if the region is not humongous, >= 1 if the region is humongous. |
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|
433 |
uint region_num() const { |
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|
434 |
if (!isHumongous()) { |
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|
435 |
return 1U; |
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changeset
|
436 |
} else { |
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changeset
|
437 |
assert(startsHumongous(), "doesn't make sense on HC regions"); |
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|
438 |
assert(capacity() % HeapRegion::GrainBytes == 0, "sanity"); |
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|
439 |
return (uint) (capacity() >> HeapRegion::LogOfHRGrainBytes); |
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|
440 |
} |
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changeset
|
441 |
} |
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changeset
|
442 |
|
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|
443 |
// Return the index + 1 of the last HC regions that's associated |
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|
444 |
// with this HS region. |
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|
445 |
uint last_hc_index() const { |
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|
446 |
assert(startsHumongous(), "don't call this otherwise"); |
26316
93f6b40c038b
8054819: Rename HeapRegionSeq to HeapRegionManager
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|
447 |
return hrm_index() + region_num(); |
13336
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|
448 |
} |
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|
449 |
|
10767
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7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
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|
450 |
// Same as Space::is_in_reserved, but will use the original size of the region. |
4ce4a9b10523
7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
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changeset
|
451 |
// The original size is different only for start humongous regions. They get |
4ce4a9b10523
7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
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changeset
|
452 |
// their _end set up to be the end of the last continues region of the |
4ce4a9b10523
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|
453 |
// corresponding humongous object. |
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7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
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changeset
|
454 |
bool is_in_reserved_raw(const void* p) const { |
26827 | 455 |
return _bottom <= p && p < orig_end(); |
10767
4ce4a9b10523
7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
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parents:
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changeset
|
456 |
} |
4ce4a9b10523
7097516: G1: assert(0<= from_card && from_card<HeapRegion::CardsPerRegion) failed: Must be in range.
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diff
changeset
|
457 |
|
7904
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7007068: G1: refine the BOT during evac failure handling
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changeset
|
458 |
// Makes the current region be a "starts humongous" region, i.e., |
e90e097fced4
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changeset
|
459 |
// the first region in a series of one or more contiguous regions |
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|
460 |
// that will contain a single "humongous" object. The two parameters |
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|
461 |
// are as follows: |
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changeset
|
462 |
// |
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|
463 |
// new_top : The new value of the top field of this region which |
e90e097fced4
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diff
changeset
|
464 |
// points to the end of the humongous object that's being |
e90e097fced4
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changeset
|
465 |
// allocated. If there is more than one region in the series, top |
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tonyp
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changeset
|
466 |
// will lie beyond this region's original end field and on the last |
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|
467 |
// region in the series. |
e90e097fced4
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changeset
|
468 |
// |
e90e097fced4
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changeset
|
469 |
// new_end : The new value of the end field of this region which |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
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changeset
|
470 |
// points to the end of the last region in the series. If there is |
e90e097fced4
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diff
changeset
|
471 |
// one region in the series (namely: this one) end will be the same |
e90e097fced4
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parents:
7397
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changeset
|
472 |
// as the original end of this region. |
e90e097fced4
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7397
diff
changeset
|
473 |
// |
e90e097fced4
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tonyp
parents:
7397
diff
changeset
|
474 |
// Updating top and end as described above makes this region look as |
e90e097fced4
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tonyp
parents:
7397
diff
changeset
|
475 |
// if it spans the entire space taken up by all the regions in the |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
476 |
// series and an single allocation moved its top to new_top. This |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
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changeset
|
477 |
// ensures that the space (capacity / allocated) taken up by all |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
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diff
changeset
|
478 |
// humongous regions can be calculated by just looking at the |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
479 |
// "starts humongous" regions and by ignoring the "continues |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
480 |
// humongous" regions. |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
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parents:
7397
diff
changeset
|
481 |
void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
1374 | 482 |
|
7904
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
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parents:
7397
diff
changeset
|
483 |
// Makes the current region be a "continues humongous' |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
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diff
changeset
|
484 |
// region. first_hr is the "start humongous" region of the series |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
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parents:
7397
diff
changeset
|
485 |
// which this region will be part of. |
e90e097fced4
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tonyp
parents:
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diff
changeset
|
486 |
void set_continuesHumongous(HeapRegion* first_hr); |
1374 | 487 |
|
7923 | 488 |
// Unsets the humongous-related fields on the region. |
26696
623a25e6c686
8057768: Make heap region region type in G1 HeapRegion explicit
tonyp
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26422
diff
changeset
|
489 |
void clear_humongous(); |
7923 | 490 |
|
1374 | 491 |
// If the region has a remembered set, return a pointer to it. |
492 |
HeapRegionRemSet* rem_set() const { |
|
493 |
return _rem_set; |
|
494 |
} |
|
495 |
||
496 |
// True iff the region is in current collection_set. |
|
497 |
bool in_collection_set() const { |
|
498 |
return _in_collection_set; |
|
499 |
} |
|
500 |
void set_in_collection_set(bool b) { |
|
501 |
_in_collection_set = b; |
|
502 |
} |
|
503 |
HeapRegion* next_in_collection_set() { |
|
504 |
assert(in_collection_set(), "should only invoke on member of CS."); |
|
505 |
assert(_next_in_special_set == NULL || |
|
506 |
_next_in_special_set->in_collection_set(), |
|
507 |
"Malformed CS."); |
|
508 |
return _next_in_special_set; |
|
509 |
} |
|
510 |
void set_next_in_collection_set(HeapRegion* r) { |
|
511 |
assert(in_collection_set(), "should only invoke on member of CS."); |
|
512 |
assert(r == NULL || r->in_collection_set(), "Malformed CS."); |
|
513 |
_next_in_special_set = r; |
|
514 |
} |
|
515 |
||
26837
72a43d3841e7
8057536: Refactor G1 to allow context specific allocations
sjohanss
parents:
26827
diff
changeset
|
516 |
void set_allocation_context(AllocationContext_t context) { |
72a43d3841e7
8057536: Refactor G1 to allow context specific allocations
sjohanss
parents:
26827
diff
changeset
|
517 |
_allocation_context = context; |
72a43d3841e7
8057536: Refactor G1 to allow context specific allocations
sjohanss
parents:
26827
diff
changeset
|
518 |
} |
72a43d3841e7
8057536: Refactor G1 to allow context specific allocations
sjohanss
parents:
26827
diff
changeset
|
519 |
|
72a43d3841e7
8057536: Refactor G1 to allow context specific allocations
sjohanss
parents:
26827
diff
changeset
|
520 |
AllocationContext_t allocation_context() const { |
72a43d3841e7
8057536: Refactor G1 to allow context specific allocations
sjohanss
parents:
26827
diff
changeset
|
521 |
return _allocation_context; |
72a43d3841e7
8057536: Refactor G1 to allow context specific allocations
sjohanss
parents:
26827
diff
changeset
|
522 |
} |
72a43d3841e7
8057536: Refactor G1 to allow context specific allocations
sjohanss
parents:
26827
diff
changeset
|
523 |
|
7923 | 524 |
// Methods used by the HeapRegionSetBase class and subclasses. |
1374 | 525 |
|
23471
ec9427262f0a
8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents:
23453
diff
changeset
|
526 |
// Getter and setter for the next and prev fields used to link regions into |
7923 | 527 |
// linked lists. |
528 |
HeapRegion* next() { return _next; } |
|
23471
ec9427262f0a
8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents:
23453
diff
changeset
|
529 |
HeapRegion* prev() { return _prev; } |
7923 | 530 |
|
531 |
void set_next(HeapRegion* next) { _next = next; } |
|
23471
ec9427262f0a
8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents:
23453
diff
changeset
|
532 |
void set_prev(HeapRegion* prev) { _prev = prev; } |
1374 | 533 |
|
7923 | 534 |
// Every region added to a set is tagged with a reference to that |
535 |
// set. This is used for doing consistency checking to make sure that |
|
536 |
// the contents of a set are as they should be and it's only |
|
537 |
// available in non-product builds. |
|
538 |
#ifdef ASSERT |
|
539 |
void set_containing_set(HeapRegionSetBase* containing_set) { |
|
540 |
assert((containing_set == NULL && _containing_set != NULL) || |
|
541 |
(containing_set != NULL && _containing_set == NULL), |
|
542 |
err_msg("containing_set: "PTR_FORMAT" " |
|
543 |
"_containing_set: "PTR_FORMAT, |
|
24424
2658d7834c6e
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
23471
diff
changeset
|
544 |
p2i(containing_set), p2i(_containing_set))); |
7923 | 545 |
|
546 |
_containing_set = containing_set; |
|
8680 | 547 |
} |
1374 | 548 |
|
7923 | 549 |
HeapRegionSetBase* containing_set() { return _containing_set; } |
550 |
#else // ASSERT |
|
551 |
void set_containing_set(HeapRegionSetBase* containing_set) { } |
|
1374 | 552 |
|
8680 | 553 |
// containing_set() is only used in asserts so there's no reason |
7923 | 554 |
// to provide a dummy version of it. |
555 |
#endif // ASSERT |
|
1374 | 556 |
|
557 |
HeapRegion* get_next_young_region() { return _next_young_region; } |
|
558 |
void set_next_young_region(HeapRegion* hr) { |
|
559 |
_next_young_region = hr; |
|
560 |
} |
|
561 |
||
2883
406d1e6d1aa1
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
2344
diff
changeset
|
562 |
HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
406d1e6d1aa1
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
2344
diff
changeset
|
563 |
HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
406d1e6d1aa1
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
2344
diff
changeset
|
564 |
void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
406d1e6d1aa1
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
2344
diff
changeset
|
565 |
bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
406d1e6d1aa1
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
2344
diff
changeset
|
566 |
|
26827 | 567 |
// For the start region of a humongous sequence, it's original end(). |
568 |
HeapWord* orig_end() const { return _bottom + GrainWords; } |
|
9989 | 569 |
|
1374 | 570 |
// Reset HR stuff to default values. |
23453
09cfb0164acf
8027295: Free CSet takes ~50% of young pause time
tschatzl
parents:
19986
diff
changeset
|
571 |
void hr_clear(bool par, bool clear_space, bool locked = false); |
9418
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
8930
diff
changeset
|
572 |
void par_clear(); |
1374 | 573 |
|
574 |
// Get the start of the unmarked area in this region. |
|
575 |
HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } |
|
576 |
HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } |
|
577 |
||
578 |
// Note the start or end of marking. This tells the heap region |
|
579 |
// that the collector is about to start or has finished (concurrently) |
|
580 |
// marking the heap. |
|
581 |
||
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
582 |
// Notify the region that concurrent marking is starting. Initialize |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
583 |
// all fields related to the next marking info. |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
584 |
inline void note_start_of_marking(); |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
585 |
|
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
586 |
// Notify the region that concurrent marking has finished. Copy the |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
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|
587 |
// (now finalized) next marking info fields into the prev marking |
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|
588 |
// info fields. |
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|
589 |
inline void note_end_of_marking(); |
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changeset
|
590 |
|
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changeset
|
591 |
// Notify the region that it will be used as to-space during a GC |
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|
592 |
// and we are about to start copying objects into it. |
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changeset
|
593 |
inline void note_start_of_copying(bool during_initial_mark); |
1374 | 594 |
|
11455
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|
595 |
// Notify the region that it ceases being to-space during a GC and |
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changeset
|
596 |
// we will not copy objects into it any more. |
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|
597 |
inline void note_end_of_copying(bool during_initial_mark); |
1374 | 598 |
|
11455
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|
599 |
// Notify the region that we are about to start processing |
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|
600 |
// self-forwarded objects during evac failure handling. |
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|
601 |
void note_self_forwarding_removal_start(bool during_initial_mark, |
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|
602 |
bool during_conc_mark); |
1374 | 603 |
|
11455
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changeset
|
604 |
// Notify the region that we have finished processing self-forwarded |
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|
605 |
// objects during evac failure handling. |
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changeset
|
606 |
void note_self_forwarding_removal_end(bool during_initial_mark, |
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|
607 |
bool during_conc_mark, |
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|
608 |
size_t marked_bytes); |
1374 | 609 |
|
610 |
// Returns "false" iff no object in the region was allocated when the |
|
611 |
// last mark phase ended. |
|
612 |
bool is_marked() { return _prev_top_at_mark_start != bottom(); } |
|
613 |
||
614 |
void reset_during_compaction() { |
|
13336
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|
615 |
assert(isHumongous() && startsHumongous(), |
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|
616 |
"should only be called for starts humongous regions"); |
1374 | 617 |
|
618 |
zero_marked_bytes(); |
|
619 |
init_top_at_mark_start(); |
|
620 |
} |
|
621 |
||
622 |
void calc_gc_efficiency(void); |
|
623 |
double gc_efficiency() { return _gc_efficiency;} |
|
624 |
||
625 |
int young_index_in_cset() const { return _young_index_in_cset; } |
|
626 |
void set_young_index_in_cset(int index) { |
|
627 |
assert( (index == -1) || is_young(), "pre-condition" ); |
|
628 |
_young_index_in_cset = index; |
|
629 |
} |
|
630 |
||
631 |
int age_in_surv_rate_group() { |
|
632 |
assert( _surv_rate_group != NULL, "pre-condition" ); |
|
633 |
assert( _age_index > -1, "pre-condition" ); |
|
634 |
return _surv_rate_group->age_in_group(_age_index); |
|
635 |
} |
|
636 |
||
637 |
void record_surv_words_in_group(size_t words_survived) { |
|
638 |
assert( _surv_rate_group != NULL, "pre-condition" ); |
|
639 |
assert( _age_index > -1, "pre-condition" ); |
|
640 |
int age_in_group = age_in_surv_rate_group(); |
|
641 |
_surv_rate_group->record_surviving_words(age_in_group, words_survived); |
|
642 |
} |
|
643 |
||
644 |
int age_in_surv_rate_group_cond() { |
|
645 |
if (_surv_rate_group != NULL) |
|
646 |
return age_in_surv_rate_group(); |
|
647 |
else |
|
648 |
return -1; |
|
649 |
} |
|
650 |
||
651 |
SurvRateGroup* surv_rate_group() { |
|
652 |
return _surv_rate_group; |
|
653 |
} |
|
654 |
||
655 |
void install_surv_rate_group(SurvRateGroup* surv_rate_group) { |
|
656 |
assert( surv_rate_group != NULL, "pre-condition" ); |
|
657 |
assert( _surv_rate_group == NULL, "pre-condition" ); |
|
658 |
assert( is_young(), "pre-condition" ); |
|
659 |
||
660 |
_surv_rate_group = surv_rate_group; |
|
661 |
_age_index = surv_rate_group->next_age_index(); |
|
662 |
} |
|
663 |
||
664 |
void uninstall_surv_rate_group() { |
|
665 |
if (_surv_rate_group != NULL) { |
|
666 |
assert( _age_index > -1, "pre-condition" ); |
|
667 |
assert( is_young(), "pre-condition" ); |
|
668 |
||
669 |
_surv_rate_group = NULL; |
|
670 |
_age_index = -1; |
|
671 |
} else { |
|
672 |
assert( _age_index == -1, "pre-condition" ); |
|
673 |
} |
|
674 |
} |
|
675 |
||
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changeset
|
676 |
void set_free() { _type.set_free(); } |
1374 | 677 |
|
26696
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8057768: Make heap region region type in G1 HeapRegion explicit
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changeset
|
678 |
void set_eden() { _type.set_eden(); } |
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changeset
|
679 |
void set_eden_pre_gc() { _type.set_eden_pre_gc(); } |
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changeset
|
680 |
void set_survivor() { _type.set_survivor(); } |
1374 | 681 |
|
26696
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changeset
|
682 |
void set_old() { _type.set_old(); } |
1374 | 683 |
|
684 |
// Determine if an object has been allocated since the last |
|
685 |
// mark performed by the collector. This returns true iff the object |
|
686 |
// is within the unmarked area of the region. |
|
687 |
bool obj_allocated_since_prev_marking(oop obj) const { |
|
688 |
return (HeapWord *) obj >= prev_top_at_mark_start(); |
|
689 |
} |
|
690 |
bool obj_allocated_since_next_marking(oop obj) const { |
|
691 |
return (HeapWord *) obj >= next_top_at_mark_start(); |
|
692 |
} |
|
693 |
||
694 |
// For parallel heapRegion traversal. |
|
695 |
bool claimHeapRegion(int claimValue); |
|
696 |
jint claim_value() { return _claimed; } |
|
697 |
// Use this carefully: only when you're sure no one is claiming... |
|
698 |
void set_claim_value(int claimValue) { _claimed = claimValue; } |
|
699 |
||
700 |
// Returns the "evacuation_failed" property of the region. |
|
701 |
bool evacuation_failed() { return _evacuation_failed; } |
|
702 |
||
703 |
// Sets the "evacuation_failed" property of the region. |
|
704 |
void set_evacuation_failed(bool b) { |
|
705 |
_evacuation_failed = b; |
|
706 |
||
707 |
if (b) { |
|
708 |
_next_marked_bytes = 0; |
|
709 |
} |
|
710 |
} |
|
711 |
||
712 |
// Requires that "mr" be entirely within the region. |
|
713 |
// Apply "cl->do_object" to all objects that intersect with "mr". |
|
714 |
// If the iteration encounters an unparseable portion of the region, |
|
715 |
// or if "cl->abort()" is true after a closure application, |
|
716 |
// terminate the iteration and return the address of the start of the |
|
717 |
// subregion that isn't done. (The two can be distinguished by querying |
|
718 |
// "cl->abort()".) Return of "NULL" indicates that the iteration |
|
719 |
// completed. |
|
720 |
HeapWord* |
|
721 |
object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); |
|
722 |
||
9418
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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diff
changeset
|
723 |
// filter_young: if true and the region is a young region then we |
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7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
724 |
// skip the iteration. |
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
725 |
// card_ptr: if not NULL, and we decide that the card is not young |
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
726 |
// and we iterate over it, we'll clean the card before we start the |
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
727 |
// iteration. |
1374 | 728 |
HeapWord* |
729 |
oops_on_card_seq_iterate_careful(MemRegion mr, |
|
6068
80ef41e75a2d
6956639: G1: assert(cached_ptr != card_ptr) failed: shouldn't be, concurrentG1Refine.cpp:307
johnc
parents:
5547
diff
changeset
|
730 |
FilterOutOfRegionClosure* cl, |
9418
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
731 |
bool filter_young, |
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
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parents:
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diff
changeset
|
732 |
jbyte* card_ptr); |
1374 | 733 |
|
5350
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
734 |
size_t recorded_rs_length() const { return _recorded_rs_length; } |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
735 |
double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
736 |
size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
737 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
738 |
void set_recorded_rs_length(size_t rs_length) { |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
739 |
_recorded_rs_length = rs_length; |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
740 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
741 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
742 |
void set_predicted_elapsed_time_ms(double ms) { |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
743 |
_predicted_elapsed_time_ms = ms; |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
744 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
745 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
746 |
void set_predicted_bytes_to_copy(size_t bytes) { |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
747 |
_predicted_bytes_to_copy = bytes; |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
748 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
749 |
|
13336
e582172ff6ff
7114678: G1: various small fixes, code cleanup, and refactoring
tonyp
parents:
12508
diff
changeset
|
750 |
virtual CompactibleSpace* next_compaction_space() const; |
1374 | 751 |
|
752 |
virtual void reset_after_compaction(); |
|
753 |
||
19339 | 754 |
// Routines for managing a list of code roots (attached to the |
755 |
// this region's RSet) that point into this heap region. |
|
756 |
void add_strong_code_root(nmethod* nm); |
|
26422 | 757 |
void add_strong_code_root_locked(nmethod* nm); |
19339 | 758 |
void remove_strong_code_root(nmethod* nm); |
759 |
||
760 |
// Applies blk->do_code_blob() to each of the entries in |
|
761 |
// the strong code roots list for this region |
|
762 |
void strong_code_roots_do(CodeBlobClosure* blk) const; |
|
763 |
||
764 |
// Verify that the entries on the strong code root list for this |
|
765 |
// region are live and include at least one pointer into this region. |
|
766 |
void verify_strong_code_roots(VerifyOption vo, bool* failures) const; |
|
767 |
||
1374 | 768 |
void print() const; |
769 |
void print_on(outputStream* st) const; |
|
770 |
||
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
771 |
// vo == UsePrevMarking -> use "prev" marking information, |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
772 |
// vo == UseNextMarking -> use "next" marking information |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
773 |
// vo == UseMarkWord -> use the mark word in the object header |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
774 |
// |
3000 | 775 |
// NOTE: Only the "prev" marking information is guaranteed to be |
776 |
// consistent most of the time, so most calls to this should use |
|
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
777 |
// vo == UsePrevMarking. |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
778 |
// Currently, there is only one case where this is called with |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
779 |
// vo == UseNextMarking, which is to verify the "next" marking |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
780 |
// information at the end of remark. |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
781 |
// Currently there is only one place where this is called with |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
782 |
// vo == UseMarkWord, which is to verify the marking during a |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
783 |
// full GC. |
12379 | 784 |
void verify(VerifyOption vo, bool *failures) const; |
3000 | 785 |
|
786 |
// Override; it uses the "prev" marking information |
|
12379 | 787 |
virtual void verify() const; |
1374 | 788 |
}; |
789 |
||
790 |
// HeapRegionClosure is used for iterating over regions. |
|
791 |
// Terminates the iteration when the "doHeapRegion" method returns "true". |
|
792 |
class HeapRegionClosure : public StackObj { |
|
26316
93f6b40c038b
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
26157
diff
changeset
|
793 |
friend class HeapRegionManager; |
1374 | 794 |
friend class G1CollectedHeap; |
795 |
||
796 |
bool _complete; |
|
797 |
void incomplete() { _complete = false; } |
|
798 |
||
799 |
public: |
|
800 |
HeapRegionClosure(): _complete(true) {} |
|
801 |
||
802 |
// Typically called on each region until it returns true. |
|
803 |
virtual bool doHeapRegion(HeapRegion* r) = 0; |
|
804 |
||
805 |
// True after iteration if the closure was applied to all heap regions |
|
806 |
// and returned "false" in all cases. |
|
807 |
bool complete() { return _complete; } |
|
808 |
}; |
|
809 |
||
7397 | 810 |
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |