author | tschatzl |
Fri, 22 Nov 2019 10:03:38 +0100 | |
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/* |
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* Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_GC_G1_HEAPREGION_HPP |
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#define SHARE_GC_G1_HEAPREGION_HPP |
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#include "gc/g1/g1BlockOffsetTable.hpp" |
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#include "gc/g1/g1HeapRegionTraceType.hpp" |
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#include "gc/g1/heapRegionTracer.hpp" |
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#include "gc/g1/heapRegionType.hpp" |
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#include "gc/g1/survRateGroup.hpp" |
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#include "gc/shared/ageTable.hpp" |
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#include "gc/shared/spaceDecorator.hpp" |
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#include "gc/shared/verifyOption.hpp" |
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#include "runtime/mutex.hpp" |
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#include "utilities/macros.hpp" |
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class G1CollectedHeap; |
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class G1CMBitMap; |
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class HeapRegionRemSet; |
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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 HeapRegion is the smallest piece of a G1CollectedHeap that |
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// can be collected independently. |
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// Each heap region is self contained. top() and end() can never |
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// be set beyond the end of the region. For humongous objects, |
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// the first region is a StartsHumongous region. If the humongous |
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// object is larger than a heap region, the following regions will |
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// be of type ContinuesHumongous. In this case the top() of the |
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// StartHumongous region and all ContinuesHumongous regions except |
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// the last will point to their own end. The last ContinuesHumongous |
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// region may have top() equal the end of object if there isn't |
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// room for filler objects to pad out to the end of the region. |
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class HeapRegion : public CHeapObj<mtGC> { |
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friend class VMStructs; |
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HeapWord* const _bottom; |
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HeapWord* const _end; |
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HeapWord* volatile _top; |
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HeapWord* _compaction_top; |
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G1BlockOffsetTablePart _bot_part; |
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Mutex _par_alloc_lock; |
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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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HeapWord* bottom() const { return _bottom; } |
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HeapWord* end() const { return _end; } |
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void set_compaction_top(HeapWord* compaction_top) { _compaction_top = compaction_top; } |
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HeapWord* compaction_top() const { return _compaction_top; } |
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void set_top(HeapWord* value) { _top = value; } |
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HeapWord* top() const { return _top; } |
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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() { return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; } |
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void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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// Returns true iff the given the heap region contains the |
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// given address as part of an allocated object. This may |
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// be a potentially, so we restrict its use to assertion checks only. |
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bool is_in(const void* p) const { |
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return is_in_reserved(p); |
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} |
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bool is_in(oop obj) const { |
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return is_in((void*)obj); |
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} |
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// Returns true iff the given reserved memory of the space contains the |
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// given address. |
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bool is_in_reserved(const void* p) const { return _bottom <= p && p < _end; } |
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size_t capacity() const { return byte_size(bottom(), end()); } |
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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_empty() const { return used() == 0; } |
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private: |
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void reset_after_compaction() { set_top(compaction_top()); } |
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void clear(bool mangle_space); |
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HeapWord* block_start_const(const void* p) const; |
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void mangle_unused_area() PRODUCT_RETURN; |
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// Try to allocate at least min_word_size and up to desired_size from this region. |
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// Returns NULL if not possible, otherwise sets actual_word_size to the amount of |
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// space allocated. |
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// This version assumes that all allocation requests to this HeapRegion are properly |
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// synchronized. |
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inline HeapWord* allocate_impl(size_t min_word_size, size_t desired_word_size, size_t* actual_word_size); |
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// Try to allocate at least min_word_size and up to desired_size from this HeapRegion. |
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// Returns NULL if not possible, otherwise sets actual_word_size to the amount of |
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// space allocated. |
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// This version synchronizes with other calls to par_allocate_impl(). |
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inline HeapWord* par_allocate_impl(size_t min_word_size, size_t desired_word_size, size_t* actual_word_size); |
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public: |
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HeapWord* block_start(const void* p); |
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void object_iterate(ObjectClosure* blk); |
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// Allocation (return NULL if full). Assumes the caller has established |
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// mutually exclusive access to the HeapRegion. |
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HeapWord* allocate(size_t min_word_size, size_t desired_word_size, size_t* actual_word_size); |
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// Allocation (return NULL if full). Enforces mutual exclusion internally. |
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HeapWord* par_allocate(size_t min_word_size, size_t desired_word_size, size_t* actual_word_size); |
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HeapWord* allocate(size_t word_size); |
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HeapWord* par_allocate(size_t word_size); |
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inline HeapWord* par_allocate_no_bot_updates(size_t min_word_size, size_t desired_word_size, size_t* word_size); |
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inline HeapWord* allocate_no_bot_updates(size_t word_size); |
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inline HeapWord* allocate_no_bot_updates(size_t min_word_size, size_t desired_word_size, size_t* actual_size); |
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// Full GC support methods. |
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HeapWord* initialize_threshold(); |
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HeapWord* cross_threshold(HeapWord* start, HeapWord* end); |
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// Update heap region to be consistent after Full GC compaction. |
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void reset_humongous_during_compaction() { |
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assert(is_humongous(), |
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"should only be called for humongous regions"); |
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zero_marked_bytes(); |
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init_top_at_mark_start(); |
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} |
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// Update heap region to be consistent after Full GC compaction. |
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void complete_compaction(); |
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// All allocated blocks are occupied by objects in a HeapRegion |
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bool block_is_obj(const HeapWord* p) const; |
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// Returns whether the given object is dead based on TAMS and bitmap. |
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bool is_obj_dead(const oop obj, const G1CMBitMap* const prev_bitmap) const; |
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// Returns the object size for all valid block starts |
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// and the amount of unallocated words if called on top() |
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size_t block_size(const HeapWord* p) const; |
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// Scans through the region using the bitmap to determine what |
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// objects to call size_t ApplyToMarkedClosure::apply(oop) for. |
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template<typename ApplyToMarkedClosure> |
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inline void apply_to_marked_objects(G1CMBitMap* bitmap, ApplyToMarkedClosure* closure); |
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void reset_bot() { |
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_bot_part.reset_bot(); |
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} |
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private: |
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// The remembered set for this region. |
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HeapRegionRemSet* _rem_set; |
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// Cached index of this region in the heap region sequence. |
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const uint _hrm_index; |
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HeapRegionType _type; |
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// For a humongous region, region in which it starts. |
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HeapRegion* _humongous_start_region; |
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// True iff an attempt to evacuate an object in the region failed. |
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bool _evacuation_failed; |
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static const uint InvalidCSetIndex = UINT_MAX; |
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// The index in the optional regions array, if this region |
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// is considered optional during a mixed collections. |
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uint _index_in_opt_cset; |
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|
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// Fields used by the HeapRegionSetBase class and subclasses. |
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HeapRegion* _next; |
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HeapRegion* _prev; |
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#ifdef ASSERT |
222 |
HeapRegionSetBase* _containing_set; |
|
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#endif // ASSERT |
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||
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// The start of the unmarked area. The unmarked area extends from this |
226 |
// word until the top and/or end of the region, and is the part |
|
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// of the region for which no marking was done, i.e. objects may |
|
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// have been allocated in this part since the last mark phase. |
|
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// "prev" is the top at the start of the last completed marking. |
|
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// "next" is the top at the start of the in-progress marking (if any.) |
|
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HeapWord* _prev_top_at_mark_start; |
|
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HeapWord* _next_top_at_mark_start; |
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// We use concurrent marking to determine the amount of live data |
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// in each heap region. |
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size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. |
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size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. |
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238 |
|
1374 | 239 |
void init_top_at_mark_start() { |
240 |
assert(_prev_marked_bytes == 0 && |
|
241 |
_next_marked_bytes == 0, |
|
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"Must be called after zero_marked_bytes."); |
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_prev_top_at_mark_start = _next_top_at_mark_start = bottom(); |
1374 | 244 |
} |
245 |
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// Data for young region survivor prediction. |
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uint _young_index_in_cset; |
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SurvRateGroup* _surv_rate_group; |
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int _age_index; |
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|
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// Cached attributes used in the collection set policy information |
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// The calculated GC efficiency of the region. |
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double _gc_efficiency; |
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255 |
|
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// The remembered set length that was added to the total value |
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// for the collection set. |
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size_t _recorded_rs_length; |
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|
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// The predicted elapsed time that was added to total value |
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// for the collection set. |
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double _predicted_elapsed_time_ms; |
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263 |
|
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uint _node_index; |
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void report_region_type_change(G1HeapRegionTraceType::Type to); |
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267 |
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// Returns whether the given object address refers to a dead object, and either the |
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// size of the object (if live) or the size of the block (if dead) in size. |
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// May |
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// - only called with obj < top() |
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// - not called on humongous objects or archive regions |
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273 |
inline bool is_obj_dead_with_size(const oop obj, const G1CMBitMap* const prev_bitmap, size_t* size) const; |
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274 |
|
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// Iterate over the references covered by the given MemRegion in a humongous |
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// object and apply the given closure to them. |
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// Humongous objects are allocated directly in the old-gen. So we need special |
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// handling for concurrent processing encountering an in-progress allocation. |
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// Returns the address after the last actually scanned or NULL if the area could |
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// not be scanned (That should only happen when invoked concurrently with the |
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// mutator). |
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282 |
template <class Closure, bool is_gc_active> |
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283 |
inline HeapWord* do_oops_on_memregion_in_humongous(MemRegion mr, |
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284 |
Closure* cl, |
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285 |
G1CollectedHeap* g1h); |
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286 |
|
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287 |
// Returns the block size of the given (dead, potentially having its class unloaded) object |
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288 |
// starting at p extending to at most the prev TAMS using the given mark bitmap. |
46750 | 289 |
inline size_t block_size_using_bitmap(const HeapWord* p, const G1CMBitMap* const prev_bitmap) const; |
58980 | 290 |
public: |
291 |
HeapRegion(uint hrm_index, G1BlockOffsetTable* bot, MemRegion mr); |
|
1374 | 292 |
|
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// If this region is a member of a HeapRegionManager, the index in that |
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// sequence, otherwise -1. |
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295 |
uint hrm_index() const { return _hrm_index; } |
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296 |
|
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// Initializing the HeapRegion not only resets the data structure, but also |
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// resets the BOT for that heap region. |
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// The default values for clear_space means that we will do the clearing if |
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300 |
// there's clearing to be done ourselves. We also always mangle the space. |
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void initialize(bool clear_space = false, bool mangle_space = SpaceDecorator::Mangle); |
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302 |
|
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static int LogOfHRGrainBytes; |
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static int LogOfHRGrainWords; |
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static int LogCardsPerRegion; |
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|
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static size_t GrainBytes; |
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static size_t GrainWords; |
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static size_t CardsPerRegion; |
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|
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static size_t align_up_to_region_byte_size(size_t sz) { |
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return (sz + (size_t) GrainBytes - 1) & |
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~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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} |
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|
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// Returns whether a field is in the same region as the obj it points to. |
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template <typename T> |
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static bool is_in_same_region(T* p, oop obj) { |
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assert(p != NULL, "p can't be NULL"); |
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assert(obj != NULL, "obj can't be NULL"); |
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return (((uintptr_t) p ^ cast_from_oop<uintptr_t>(obj)) >> LogOfHRGrainBytes) == 0; |
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} |
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323 |
|
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static size_t max_region_size(); |
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325 |
static size_t min_region_size_in_words(); |
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|
326 |
|
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|
327 |
// It sets up the heap region size (GrainBytes / GrainWords), as |
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|
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// well as other related fields that are based on the heap region |
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|
329 |
// size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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|
330 |
// CardsPerRegion). All those fields are considered constant |
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|
331 |
// throughout the JVM's execution, therefore they should only be set |
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|
332 |
// up once during initialization time. |
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|
333 |
static void setup_heap_region_size(size_t initial_heap_size, size_t max_heap_size); |
1374 | 334 |
|
335 |
// The number of bytes marked live in the region in the last marking phase. |
|
336 |
size_t marked_bytes() { return _prev_marked_bytes; } |
|
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|
337 |
size_t live_bytes() { |
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|
338 |
return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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|
339 |
} |
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|
340 |
|
1374 | 341 |
// The number of bytes counted in the next marking. |
342 |
size_t next_marked_bytes() { return _next_marked_bytes; } |
|
343 |
// The number of bytes live wrt the next marking. |
|
344 |
size_t next_live_bytes() { |
|
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|
345 |
return |
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|
346 |
(top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
1374 | 347 |
} |
348 |
||
349 |
// A lower bound on the amount of garbage bytes in the region. |
|
350 |
size_t garbage_bytes() { |
|
351 |
size_t used_at_mark_start_bytes = |
|
352 |
(prev_top_at_mark_start() - bottom()) * HeapWordSize; |
|
353 |
return used_at_mark_start_bytes - marked_bytes(); |
|
354 |
} |
|
355 |
||
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|
356 |
// Return the amount of bytes we'll reclaim if we collect this |
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|
357 |
// region. This includes not only the known garbage bytes in the |
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|
358 |
// region but also any unallocated space in it, i.e., [top, end), |
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|
359 |
// since it will also be reclaimed if we collect the region. |
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|
360 |
size_t reclaimable_bytes() { |
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|
361 |
size_t known_live_bytes = live_bytes(); |
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|
362 |
assert(known_live_bytes <= capacity(), "sanity"); |
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|
363 |
return capacity() - known_live_bytes; |
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|
364 |
} |
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|
365 |
|
1374 | 366 |
// An upper bound on the number of live bytes in the region. |
367 |
size_t max_live_bytes() { return used() - garbage_bytes(); } |
|
368 |
||
369 |
void add_to_marked_bytes(size_t incr_bytes) { |
|
370 |
_next_marked_bytes = _next_marked_bytes + incr_bytes; |
|
371 |
} |
|
372 |
||
373 |
void zero_marked_bytes() { |
|
374 |
_prev_marked_bytes = _next_marked_bytes = 0; |
|
375 |
} |
|
59218
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|
376 |
// Get the start of the unmarked area in this region. |
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|
377 |
HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } |
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|
378 |
HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } |
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|
379 |
|
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changeset
|
380 |
// Note the start or end of marking. This tells the heap region |
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|
381 |
// that the collector is about to start or has finished (concurrently) |
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|
382 |
// marking the heap. |
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|
383 |
|
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changeset
|
384 |
// Notify the region that concurrent marking is starting. Initialize |
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|
385 |
// all fields related to the next marking info. |
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changeset
|
386 |
inline void note_start_of_marking(); |
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changeset
|
387 |
|
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changeset
|
388 |
// Notify the region that concurrent marking has finished. Copy the |
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changeset
|
389 |
// (now finalized) next marking info fields into the prev marking |
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|
390 |
// info fields. |
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changeset
|
391 |
inline void note_end_of_marking(); |
1374 | 392 |
|
26696
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diff
changeset
|
393 |
const char* get_type_str() const { return _type.get_str(); } |
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changeset
|
394 |
const char* get_short_type_str() const { return _type.get_short_str(); } |
36098
e056a98ac7ca
8149650: Create a trace event for G1 heap region type transitions
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parents:
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diff
changeset
|
395 |
G1HeapRegionTraceType::Type get_trace_type() { return _type.get_trace_type(); } |
26696
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changeset
|
396 |
|
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changeset
|
397 |
bool is_free() const { return _type.is_free(); } |
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changeset
|
398 |
|
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diff
changeset
|
399 |
bool is_young() const { return _type.is_young(); } |
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changeset
|
400 |
bool is_eden() const { return _type.is_eden(); } |
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changeset
|
401 |
bool is_survivor() const { return _type.is_survivor(); } |
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changeset
|
402 |
|
26846
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8058495: G1: normalize names for isHumongous() and friends
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diff
changeset
|
403 |
bool is_humongous() const { return _type.is_humongous(); } |
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8058495: G1: normalize names for isHumongous() and friends
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diff
changeset
|
404 |
bool is_starts_humongous() const { return _type.is_starts_humongous(); } |
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8058495: G1: normalize names for isHumongous() and friends
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diff
changeset
|
405 |
bool is_continues_humongous() const { return _type.is_continues_humongous(); } |
26696
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changeset
|
406 |
|
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diff
changeset
|
407 |
bool is_old() const { return _type.is_old(); } |
623a25e6c686
8057768: Make heap region region type in G1 HeapRegion explicit
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parents:
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diff
changeset
|
408 |
|
42589
037b433e8069
8166811: Missing memory fences between memory allocation and refinement
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parents:
42588
diff
changeset
|
409 |
bool is_old_or_humongous() const { return _type.is_old_or_humongous(); } |
037b433e8069
8166811: Missing memory fences between memory allocation and refinement
kbarrett
parents:
42588
diff
changeset
|
410 |
|
51494
1906adbef2dc
8208498: Put archive regions into a first-class HeapRegionSet
tschatzl
parents:
50441
diff
changeset
|
411 |
bool is_old_or_humongous_or_archive() const { return _type.is_old_or_humongous_or_archive(); } |
1906adbef2dc
8208498: Put archive regions into a first-class HeapRegionSet
tschatzl
parents:
50441
diff
changeset
|
412 |
|
31346
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jiangli
parents:
30764
diff
changeset
|
413 |
// A pinned region contains objects which are not moved by garbage collections. |
a70d45c06136
8042668: GC Support for shared heap ranges in CDS
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parents:
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diff
changeset
|
414 |
// Humongous regions and archive regions are pinned. |
a70d45c06136
8042668: GC Support for shared heap ranges in CDS
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parents:
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diff
changeset
|
415 |
bool is_pinned() const { return _type.is_pinned(); } |
a70d45c06136
8042668: GC Support for shared heap ranges in CDS
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parents:
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diff
changeset
|
416 |
|
a70d45c06136
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jiangli
parents:
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diff
changeset
|
417 |
// An archive region is a pinned region, also tagged as old, which |
a70d45c06136
8042668: GC Support for shared heap ranges in CDS
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parents:
30764
diff
changeset
|
418 |
// should not be marked during mark/sweep. This allows the address |
a70d45c06136
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parents:
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diff
changeset
|
419 |
// space to be shared by JVM instances. |
46810
7dad333205cd
8179302: Pre-resolve constant pool string entries and cache resolved_reference arrays in CDS archive.
jiangli
parents:
46750
diff
changeset
|
420 |
bool is_archive() const { return _type.is_archive(); } |
7dad333205cd
8179302: Pre-resolve constant pool string entries and cache resolved_reference arrays in CDS archive.
jiangli
parents:
46750
diff
changeset
|
421 |
bool is_open_archive() const { return _type.is_open_archive(); } |
7dad333205cd
8179302: Pre-resolve constant pool string entries and cache resolved_reference arrays in CDS archive.
jiangli
parents:
46750
diff
changeset
|
422 |
bool is_closed_archive() const { return _type.is_closed_archive(); } |
31346
a70d45c06136
8042668: GC Support for shared heap ranges in CDS
jiangli
parents:
30764
diff
changeset
|
423 |
|
59218
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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parents:
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diff
changeset
|
424 |
void set_free(); |
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8233306: Sort members in G1's HeapRegion after removal of Space dependency
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diff
changeset
|
425 |
|
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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diff
changeset
|
426 |
void set_eden(); |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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parents:
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diff
changeset
|
427 |
void set_eden_pre_gc(); |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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diff
changeset
|
428 |
void set_survivor(); |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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parents:
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diff
changeset
|
429 |
|
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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parents:
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diff
changeset
|
430 |
void move_to_old(); |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
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diff
changeset
|
431 |
void set_old(); |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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diff
changeset
|
432 |
|
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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diff
changeset
|
433 |
void set_open_archive(); |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
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diff
changeset
|
434 |
void set_closed_archive(); |
a1155217a563
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diff
changeset
|
435 |
|
1374 | 436 |
// For a humongous region, region in which it starts. |
437 |
HeapRegion* humongous_start_region() const { |
|
438 |
return _humongous_start_region; |
|
439 |
} |
|
440 |
||
7904
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
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diff
changeset
|
441 |
// Makes the current region be a "starts humongous" region, i.e., |
e90e097fced4
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diff
changeset
|
442 |
// the first region in a series of one or more contiguous regions |
33786
ac8da6513351
8139867: Change how startsHumongous and continuesHumongous regions work in G1.
david
parents:
33205
diff
changeset
|
443 |
// that will contain a single "humongous" object. |
7904
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7007068: G1: refine the BOT during evac failure handling
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diff
changeset
|
444 |
// |
34249
a015a11067a2
8138681: Runtime.getFreeMemory() reports wrong value after humongous allocation.
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parents:
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diff
changeset
|
445 |
// obj_top : points to the top of the humongous object. |
a015a11067a2
8138681: Runtime.getFreeMemory() reports wrong value after humongous allocation.
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diff
changeset
|
446 |
// fill_size : size of the filler object at the end of the region series. |
a015a11067a2
8138681: Runtime.getFreeMemory() reports wrong value after humongous allocation.
david
parents:
33786
diff
changeset
|
447 |
void set_starts_humongous(HeapWord* obj_top, size_t fill_size); |
1374 | 448 |
|
7904
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7007068: G1: refine the BOT during evac failure handling
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diff
changeset
|
449 |
// Makes the current region be a "continues humongous' |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
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parents:
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diff
changeset
|
450 |
// 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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diff
changeset
|
451 |
// which this region will be part of. |
26846
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8058495: G1: normalize names for isHumongous() and friends
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diff
changeset
|
452 |
void set_continues_humongous(HeapRegion* first_hr); |
1374 | 453 |
|
7923 | 454 |
// Unsets the humongous-related fields on the region. |
26696
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diff
changeset
|
455 |
void clear_humongous(); |
7923 | 456 |
|
1374 | 457 |
// If the region has a remembered set, return a pointer to it. |
458 |
HeapRegionRemSet* rem_set() const { |
|
459 |
return _rem_set; |
|
460 |
} |
|
461 |
||
32185
49a57ff2c3cb
8073052: Rename and clean up the allocation manager hierarchy in g1Allocator.?pp
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31592
diff
changeset
|
462 |
inline bool in_collection_set() const; |
29470
e34bbcd36e53
8030646: track collection set membership in one place
ehelin
parents:
28207
diff
changeset
|
463 |
|
7923 | 464 |
// Methods used by the HeapRegionSetBase class and subclasses. |
1374 | 465 |
|
23471
ec9427262f0a
8036025: Sort the freelist in order to shrink the heap
jwilhelm
parents:
23453
diff
changeset
|
466 |
// Getter and setter for the next and prev fields used to link regions into |
7923 | 467 |
// linked lists. |
59218
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diff
changeset
|
468 |
void set_next(HeapRegion* next) { _next = next; } |
7923 | 469 |
HeapRegion* next() { return _next; } |
470 |
||
23471
ec9427262f0a
8036025: Sort the freelist in order to shrink the heap
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23453
diff
changeset
|
471 |
void set_prev(HeapRegion* prev) { _prev = prev; } |
59218
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diff
changeset
|
472 |
HeapRegion* prev() { return _prev; } |
1374 | 473 |
|
7923 | 474 |
// Every region added to a set is tagged with a reference to that |
475 |
// set. This is used for doing consistency checking to make sure that |
|
476 |
// the contents of a set are as they should be and it's only |
|
477 |
// available in non-product builds. |
|
478 |
#ifdef ASSERT |
|
479 |
void set_containing_set(HeapRegionSetBase* containing_set) { |
|
480 |
assert((containing_set == NULL && _containing_set != NULL) || |
|
481 |
(containing_set != NULL && _containing_set == NULL), |
|
33105
294e48b4f704
8080775: Better argument formatting for assert() and friends
david
parents:
32389
diff
changeset
|
482 |
"containing_set: " PTR_FORMAT " " |
294e48b4f704
8080775: Better argument formatting for assert() and friends
david
parents:
32389
diff
changeset
|
483 |
"_containing_set: " PTR_FORMAT, |
294e48b4f704
8080775: Better argument formatting for assert() and friends
david
parents:
32389
diff
changeset
|
484 |
p2i(containing_set), p2i(_containing_set)); |
7923 | 485 |
|
486 |
_containing_set = containing_set; |
|
8680 | 487 |
} |
1374 | 488 |
|
7923 | 489 |
HeapRegionSetBase* containing_set() { return _containing_set; } |
490 |
#else // ASSERT |
|
491 |
void set_containing_set(HeapRegionSetBase* containing_set) { } |
|
1374 | 492 |
|
8680 | 493 |
// containing_set() is only used in asserts so there's no reason |
7923 | 494 |
// to provide a dummy version of it. |
495 |
#endif // ASSERT |
|
1374 | 496 |
|
497 |
||
39979 | 498 |
// Reset the HeapRegion to default values. |
499 |
// If skip_remset is true, do not clear the remembered set. |
|
49632
64f9ebc85e67
8197573: Remove concurrent cleanup and secondary free list handling
tschatzl
parents:
49605
diff
changeset
|
500 |
// If clear_space is true, clear the HeapRegion's memory. |
64f9ebc85e67
8197573: Remove concurrent cleanup and secondary free list handling
tschatzl
parents:
49605
diff
changeset
|
501 |
// If locked is true, assume we are the only thread doing this operation. |
39979 | 502 |
void hr_clear(bool skip_remset, bool clear_space, bool locked = false); |
49632
64f9ebc85e67
8197573: Remove concurrent cleanup and secondary free list handling
tschatzl
parents:
49605
diff
changeset
|
503 |
// Clear the card table corresponding to this region. |
64f9ebc85e67
8197573: Remove concurrent cleanup and secondary free list handling
tschatzl
parents:
49605
diff
changeset
|
504 |
void clear_cardtable(); |
1374 | 505 |
|
59218
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
506 |
// Returns the "evacuation_failed" property of the region. |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
507 |
bool evacuation_failed() { return _evacuation_failed; } |
1374 | 508 |
|
59218
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
509 |
// Sets the "evacuation_failed" property of the region. |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
510 |
void set_evacuation_failed(bool b) { |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
511 |
_evacuation_failed = b; |
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
512 |
|
59218
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
513 |
if (b) { |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
514 |
_next_marked_bytes = 0; |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
515 |
} |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
516 |
} |
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
517 |
|
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
518 |
// Notify the region that we are about to start processing |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
519 |
// self-forwarded objects during evac failure handling. |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
520 |
void note_self_forwarding_removal_start(bool during_initial_mark, |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
521 |
bool during_conc_mark); |
1374 | 522 |
|
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
523 |
// Notify the region that we have finished processing self-forwarded |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11451
diff
changeset
|
524 |
// objects during evac failure handling. |
46258
d26ebd7e2f10
8142749: HeapRegion::_predicted_bytes_to_copy is unused and can be removed
fzhinkin
parents:
42589
diff
changeset
|
525 |
void note_self_forwarding_removal_end(size_t marked_bytes); |
1374 | 526 |
|
54465
c4f16445675a
8218668: Clean up evacuation of optional collection set
tschatzl
parents:
53703
diff
changeset
|
527 |
uint index_in_opt_cset() const { |
c4f16445675a
8218668: Clean up evacuation of optional collection set
tschatzl
parents:
53703
diff
changeset
|
528 |
assert(has_index_in_opt_cset(), "Opt cset index not set."); |
c4f16445675a
8218668: Clean up evacuation of optional collection set
tschatzl
parents:
53703
diff
changeset
|
529 |
return _index_in_opt_cset; |
c4f16445675a
8218668: Clean up evacuation of optional collection set
tschatzl
parents:
53703
diff
changeset
|
530 |
} |
c4f16445675a
8218668: Clean up evacuation of optional collection set
tschatzl
parents:
53703
diff
changeset
|
531 |
bool has_index_in_opt_cset() const { return _index_in_opt_cset != InvalidCSetIndex; } |
52897
495c05ee2a9a
8213890: Implementation of JEP 344: Abortable Mixed Collections for G1
sjohanss
parents:
52875
diff
changeset
|
532 |
void set_index_in_opt_cset(uint index) { _index_in_opt_cset = index; } |
54465
c4f16445675a
8218668: Clean up evacuation of optional collection set
tschatzl
parents:
53703
diff
changeset
|
533 |
void clear_index_in_opt_cset() { _index_in_opt_cset = InvalidCSetIndex; } |
52897
495c05ee2a9a
8213890: Implementation of JEP 344: Abortable Mixed Collections for G1
sjohanss
parents:
52875
diff
changeset
|
534 |
|
59218
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
535 |
void calc_gc_efficiency(void); |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
536 |
double gc_efficiency() const { return _gc_efficiency;} |
a1155217a563
8233306: Sort members in G1's HeapRegion after removal of Space dependency
tschatzl
parents:
59060
diff
changeset
|
537 |
|
57802 | 538 |
uint young_index_in_cset() const { return _young_index_in_cset; } |
539 |
void clear_young_index_in_cset() { _young_index_in_cset = 0; } |
|
540 |
void set_young_index_in_cset(uint index) { |
|
541 |
assert(index != UINT_MAX, "just checking"); |
|
542 |
assert(index != 0, "just checking"); |
|
543 |
assert(is_young(), "pre-condition"); |
|
1374 | 544 |
_young_index_in_cset = index; |
545 |
} |
|
546 |
||
547 |
int age_in_surv_rate_group() { |
|
57802 | 548 |
assert(_surv_rate_group != NULL, "pre-condition"); |
549 |
assert(_age_index > -1, "pre-condition"); |
|
1374 | 550 |
return _surv_rate_group->age_in_group(_age_index); |
551 |
} |
|
552 |
||
553 |
void record_surv_words_in_group(size_t words_survived) { |
|
57802 | 554 |
assert(_surv_rate_group != NULL, "pre-condition"); |
555 |
assert(_age_index > -1, "pre-condition"); |
|
1374 | 556 |
int age_in_group = age_in_surv_rate_group(); |
557 |
_surv_rate_group->record_surviving_words(age_in_group, words_survived); |
|
558 |
} |
|
559 |
||
560 |
int age_in_surv_rate_group_cond() { |
|
561 |
if (_surv_rate_group != NULL) |
|
562 |
return age_in_surv_rate_group(); |
|
563 |
else |
|
564 |
return -1; |
|
565 |
} |
|
566 |
||
567 |
SurvRateGroup* surv_rate_group() { |
|
568 |
return _surv_rate_group; |
|
569 |
} |
|
570 |
||
571 |
void install_surv_rate_group(SurvRateGroup* surv_rate_group) { |
|
57802 | 572 |
assert(surv_rate_group != NULL, "pre-condition"); |
573 |
assert(_surv_rate_group == NULL, "pre-condition"); |
|
574 |
assert(is_young(), "pre-condition"); |
|
1374 | 575 |
|
576 |
_surv_rate_group = surv_rate_group; |
|
577 |
_age_index = surv_rate_group->next_age_index(); |
|
578 |
} |
|
579 |
||
580 |
void uninstall_surv_rate_group() { |
|
581 |
if (_surv_rate_group != NULL) { |
|
57802 | 582 |
assert(_age_index > -1, "pre-condition"); |
583 |
assert(is_young(), "pre-condition"); |
|
1374 | 584 |
|
585 |
_surv_rate_group = NULL; |
|
586 |
_age_index = -1; |
|
587 |
} else { |
|
57802 | 588 |
assert(_age_index == -1, "pre-condition"); |
1374 | 589 |
} |
590 |
} |
|
591 |
||
592 |
// Determine if an object has been allocated since the last |
|
593 |
// mark performed by the collector. This returns true iff the object |
|
594 |
// is within the unmarked area of the region. |
|
595 |
bool obj_allocated_since_prev_marking(oop obj) const { |
|
596 |
return (HeapWord *) obj >= prev_top_at_mark_start(); |
|
597 |
} |
|
598 |
bool obj_allocated_since_next_marking(oop obj) const { |
|
599 |
return (HeapWord *) obj >= next_top_at_mark_start(); |
|
600 |
} |
|
601 |
||
55607
5919b273def6
8224741: Optimize the scan area during the Scan Heap Roots phase
tschatzl
parents:
55510
diff
changeset
|
602 |
// Iterate over the objects overlapping the given memory region, applying cl |
42589
037b433e8069
8166811: Missing memory fences between memory allocation and refinement
kbarrett
parents:
42588
diff
changeset
|
603 |
// to all references in the region. This is a helper for |
46517
14de3e5151a9
8071280: Specialize HeapRegion::oops_on_card_seq_iterate_careful() for use during concurrent refinement and updating the rset
tschatzl
parents:
46307
diff
changeset
|
604 |
// G1RemSet::refine_card*, and is tightly coupled with them. |
55607
5919b273def6
8224741: Optimize the scan area during the Scan Heap Roots phase
tschatzl
parents:
55510
diff
changeset
|
605 |
// mr must not be empty. Must be trimmed to the allocated/parseable space in this region. |
42589
037b433e8069
8166811: Missing memory fences between memory allocation and refinement
kbarrett
parents:
42588
diff
changeset
|
606 |
// This region must be old or humongous. |
55607
5919b273def6
8224741: Optimize the scan area during the Scan Heap Roots phase
tschatzl
parents:
55510
diff
changeset
|
607 |
// Returns the next unscanned address if the designated objects were successfully |
5919b273def6
8224741: Optimize the scan area during the Scan Heap Roots phase
tschatzl
parents:
55510
diff
changeset
|
608 |
// processed, NULL if an unparseable part of the heap was encountered (That should |
5919b273def6
8224741: Optimize the scan area during the Scan Heap Roots phase
tschatzl
parents:
55510
diff
changeset
|
609 |
// only happen when invoked concurrently with the mutator). |
46517
14de3e5151a9
8071280: Specialize HeapRegion::oops_on_card_seq_iterate_careful() for use during concurrent refinement and updating the rset
tschatzl
parents:
46307
diff
changeset
|
610 |
template <bool is_gc_active, class Closure> |
55607
5919b273def6
8224741: Optimize the scan area during the Scan Heap Roots phase
tschatzl
parents:
55510
diff
changeset
|
611 |
inline HeapWord* oops_on_memregion_seq_iterate_careful(MemRegion mr, Closure* cl); |
1374 | 612 |
|
5350
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
613 |
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
johnc
parents:
4024
diff
changeset
|
614 |
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:
4024
diff
changeset
|
615 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
616 |
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:
4024
diff
changeset
|
617 |
_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
|
618 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
619 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
620 |
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
|
621 |
_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
|
622 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
623 |
|
19339 | 624 |
// Routines for managing a list of code roots (attached to the |
625 |
// this region's RSet) that point into this heap region. |
|
626 |
void add_strong_code_root(nmethod* nm); |
|
26422 | 627 |
void add_strong_code_root_locked(nmethod* nm); |
19339 | 628 |
void remove_strong_code_root(nmethod* nm); |
629 |
||
630 |
// Applies blk->do_code_blob() to each of the entries in |
|
631 |
// the strong code roots list for this region |
|
632 |
void strong_code_roots_do(CodeBlobClosure* blk) const; |
|
633 |
||
59060
fce1fa1bdc91
8220310: Implementation: NUMA-Aware Memory Allocation for G1, Mutator (1/3)
sangheki
parents:
58980
diff
changeset
|
634 |
uint node_index() const { return _node_index; } |
fce1fa1bdc91
8220310: Implementation: NUMA-Aware Memory Allocation for G1, Mutator (1/3)
sangheki
parents:
58980
diff
changeset
|
635 |
void set_node_index(uint node_index) { _node_index = node_index; } |
fce1fa1bdc91
8220310: Implementation: NUMA-Aware Memory Allocation for G1, Mutator (1/3)
sangheki
parents:
58980
diff
changeset
|
636 |
|
19339 | 637 |
// Verify that the entries on the strong code root list for this |
638 |
// region are live and include at least one pointer into this region. |
|
639 |
void verify_strong_code_roots(VerifyOption vo, bool* failures) const; |
|
640 |
||
1374 | 641 |
void print() const; |
642 |
void print_on(outputStream* st) const; |
|
643 |
||
47885
5caa1d5f74c1
8186571: Implementation: JEP 307: Parallel Full GC for G1
sjohanss
parents:
47216
diff
changeset
|
644 |
// vo == UsePrevMarking -> use "prev" marking information, |
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
645 |
// vo == UseNextMarking -> use "next" marking information |
47885
5caa1d5f74c1
8186571: Implementation: JEP 307: Parallel Full GC for G1
sjohanss
parents:
47216
diff
changeset
|
646 |
// vo == UseFullMarking -> use "next" marking bitmap but no TAMS |
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
647 |
// |
3000 | 648 |
// NOTE: Only the "prev" marking information is guaranteed to be |
649 |
// 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
|
650 |
// vo == UsePrevMarking. |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
651 |
// 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
|
652 |
// vo == UseNextMarking, which is to verify the "next" marking |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
653 |
// information at the end of remark. |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
654 |
// Currently there is only one place where this is called with |
47885
5caa1d5f74c1
8186571: Implementation: JEP 307: Parallel Full GC for G1
sjohanss
parents:
47216
diff
changeset
|
655 |
// vo == UseFullMarking, which is to verify the marking during a |
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9989
diff
changeset
|
656 |
// full GC. |
12379 | 657 |
void verify(VerifyOption vo, bool *failures) const; |
3000 | 658 |
|
58980 | 659 |
// Verify using the "prev" marking information |
660 |
void verify() const; |
|
35507
aa2affc60a2f
8145442: Add the facility to verify remembered sets for G1
poonam
parents:
35461
diff
changeset
|
661 |
|
aa2affc60a2f
8145442: Add the facility to verify remembered sets for G1
poonam
parents:
35461
diff
changeset
|
662 |
void verify_rem_set(VerifyOption vo, bool *failures) const; |
aa2affc60a2f
8145442: Add the facility to verify remembered sets for G1
poonam
parents:
35461
diff
changeset
|
663 |
void verify_rem_set() const; |
1374 | 664 |
}; |
665 |
||
666 |
// HeapRegionClosure is used for iterating over regions. |
|
48969 | 667 |
// Terminates the iteration when the "do_heap_region" method returns "true". |
1374 | 668 |
class HeapRegionClosure : public StackObj { |
26316
93f6b40c038b
8054819: Rename HeapRegionSeq to HeapRegionManager
tschatzl
parents:
26157
diff
changeset
|
669 |
friend class HeapRegionManager; |
39698
4016de4e596b
8159978: Use an array to store the collection set regions instead of linking through regions
tschatzl
parents:
38183
diff
changeset
|
670 |
friend class G1CollectionSet; |
53703
24341625d8f2
8217330: Split G1CollectionSetChooser into collection set candidate container and the chooser algorithm
tschatzl
parents:
53244
diff
changeset
|
671 |
friend class G1CollectionSetCandidates; |
1374 | 672 |
|
48969 | 673 |
bool _is_complete; |
674 |
void set_incomplete() { _is_complete = false; } |
|
1374 | 675 |
|
58980 | 676 |
public: |
48969 | 677 |
HeapRegionClosure(): _is_complete(true) {} |
1374 | 678 |
|
679 |
// Typically called on each region until it returns true. |
|
48969 | 680 |
virtual bool do_heap_region(HeapRegion* r) = 0; |
1374 | 681 |
|
682 |
// True after iteration if the closure was applied to all heap regions |
|
683 |
// and returned "false" in all cases. |
|
48969 | 684 |
bool is_complete() { return _is_complete; } |
1374 | 685 |
}; |
686 |
||
53244
9807daeb47c4
8216167: Update include guards to reflect correct directories
coleenp
parents:
52897
diff
changeset
|
687 |
#endif // SHARE_GC_G1_HEAPREGION_HPP |