author | tonyp |
Fri, 10 Jun 2011 13:16:40 -0400 | |
changeset 9989 | 305a76435cf1 |
parent 9418 | 32a87dd6b746 |
child 9995 | 290620c08233 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |
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#include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
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#include "gc_implementation/g1/g1_specialized_oop_closures.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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#ifndef SERIALGC |
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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 CompactibleSpace; |
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class ContiguousSpace; |
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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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#define HR_FORMAT SIZE_FORMAT":(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
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#define HR_FORMAT_PARAMS(_hr_) \ |
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(_hr_)->hrs_index(), \ |
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(_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : "-", \ |
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(_hr_)->bottom(), (_hr_)->top(), (_hr_)->end() |
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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 ContiguousSpaceDCTOC { |
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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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void walk_mem_region_with_cl(MemRegion mr, |
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HeapWord* bottom, HeapWord* top, |
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OopClosure* cl); |
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// We don't specialize this for FilteringClosure; filtering is handled by |
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// the "FilterKind" mechanism. But we provide this to avoid a compiler |
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// warning. |
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void walk_mem_region_with_cl(MemRegion mr, |
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HeapWord* bottom, HeapWord* top, |
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FilteringClosure* cl) { |
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HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, |
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(OopClosure*)cl); |
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} |
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// Get the actual top of the area on which the closure will |
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// operate, given where the top is assumed to be (the end of the |
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// memory region passed to do_MemRegion) and where the object |
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// at the top is assumed to start. For example, an object may |
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// start at the top but actually extend past the assumed top, |
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// in which case the top becomes the end of the object. |
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HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { |
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return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); |
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} |
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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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Filtering_DCTOC::walk_mem_region(mr, bottom, top); |
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} |
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public: |
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HeapRegionDCTOC(G1CollectedHeap* g1, |
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HeapRegion* hr, OopClosure* 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 ContiguousSpace { |
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friend class VMStructs; |
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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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// Constructor. If "is_zeroed" is true, the MemRegion "mr" may be |
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// assumed to contain zeros. |
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G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, |
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MemRegion mr, bool is_zeroed = false); |
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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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virtual void set_saved_mark(); |
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void reset_gc_time_stamp() { _gc_time_stamp = 0; } |
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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 initialize(MemRegion mr, bool clear_space, bool mangle_space); |
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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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// 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.zero_bottom_entry(); |
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_offsets.initialize_threshold(); |
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} |
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void update_bot_for_object(HeapWord* start, size_t word_size) { |
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_offsets.alloc_block(start, word_size); |
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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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enum HumongousType { |
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NotHumongous = 0, |
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StartsHumongous, |
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ContinuesHumongous |
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}; |
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225 |
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// The next filter kind that should be used for a "new_dcto_cl" call with |
227 |
// the "traditional" signature. |
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HeapRegionDCTOC::FilterKind _next_fk; |
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230 |
// Requires that the region "mr" be dense with objects, and begin and end |
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// with an object. |
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void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); |
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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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||
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G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } |
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protected: |
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// The index of this region in the heap region sequence. |
243 |
size_t _hrs_index; |
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HumongousType _humongous_type; |
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// For a humongous region, region in which it starts. |
247 |
HeapRegion* _humongous_start_region; |
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// For the start region of a humongous sequence, it's original end(). |
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HeapWord* _orig_end; |
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// True iff the region is in current collection_set. |
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bool _in_collection_set; |
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// Is this or has it been an allocation region in the current collection |
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// pause. |
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bool _is_gc_alloc_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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// A heap region may be a member one of a number of special subsets, each |
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// represented as linked lists through the field below. Currently, these |
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// sets include: |
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// The collection set. |
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// The set of allocation regions used in a collection pause. |
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// Spaces that may contain gray objects. |
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HeapRegion* _next_in_special_set; |
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268 |
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// next region in the young "generation" region set |
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HeapRegion* _next_young_region; |
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// Next region whose cards need cleaning |
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HeapRegion* _next_dirty_cards_region; |
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// Fields used by the HeapRegionSetBase class and subclasses. |
276 |
HeapRegion* _next; |
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277 |
#ifdef ASSERT |
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278 |
HeapRegionSetBase* _containing_set; |
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#endif // ASSERT |
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bool _pending_removal; |
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281 |
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// For parallel heapRegion traversal. |
283 |
jint _claimed; |
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284 |
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285 |
// 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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290 |
// See "sort_index" method. -1 means is not in the array. |
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int _sort_index; |
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292 |
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293 |
// <PREDICTION> |
|
294 |
double _gc_efficiency; |
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// </PREDICTION> |
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296 |
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297 |
enum YoungType { |
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298 |
NotYoung, // a region is not young |
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Young, // a region is young |
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Survivor // a region is young and it contains survivors |
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}; |
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volatile YoungType _young_type; |
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int _young_index_in_cset; |
305 |
SurvRateGroup* _surv_rate_group; |
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int _age_index; |
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||
308 |
// The start of the unmarked area. The unmarked area extends from this |
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// 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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311 |
// 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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314 |
HeapWord* _prev_top_at_mark_start; |
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315 |
HeapWord* _next_top_at_mark_start; |
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316 |
// If a collection pause is in progress, this is the top at the start |
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// of that pause. |
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||
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// We've counted the marked bytes of objects below here. |
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320 |
HeapWord* _top_at_conc_mark_count; |
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321 |
||
322 |
void init_top_at_mark_start() { |
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323 |
assert(_prev_marked_bytes == 0 && |
|
324 |
_next_marked_bytes == 0, |
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325 |
"Must be called after zero_marked_bytes."); |
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326 |
HeapWord* bot = bottom(); |
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327 |
_prev_top_at_mark_start = bot; |
|
328 |
_next_top_at_mark_start = bot; |
|
329 |
_top_at_conc_mark_count = bot; |
|
330 |
} |
|
331 |
||
332 |
void set_young_type(YoungType new_type) { |
|
333 |
//assert(_young_type != new_type, "setting the same type" ); |
|
334 |
// TODO: add more assertions here |
|
335 |
_young_type = new_type; |
|
336 |
} |
|
337 |
||
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|
338 |
// Cached attributes used in the collection set policy information |
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|
339 |
|
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|
340 |
// The RSet length that was added to the total value |
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|
341 |
// for the collection set. |
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|
342 |
size_t _recorded_rs_length; |
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diff
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|
343 |
|
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|
344 |
// The predicted elapsed time that was added to total value |
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|
345 |
// for the collection set. |
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|
346 |
double _predicted_elapsed_time_ms; |
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|
347 |
|
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changeset
|
348 |
// The predicted number of bytes to copy that was added to |
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|
349 |
// the total value for the collection set. |
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|
350 |
size_t _predicted_bytes_to_copy; |
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|
351 |
|
1374 | 352 |
public: |
353 |
// If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. |
|
9989 | 354 |
HeapRegion(size_t hrs_index, |
355 |
G1BlockOffsetSharedArray* sharedOffsetArray, |
|
1374 | 356 |
MemRegion mr, bool is_zeroed); |
357 |
||
3697
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|
358 |
static int LogOfHRGrainBytes; |
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diff
changeset
|
359 |
static int LogOfHRGrainWords; |
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diff
changeset
|
360 |
// The normal type of these should be size_t. However, they used to |
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diff
changeset
|
361 |
// be members of an enum before and they are assumed by the |
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diff
changeset
|
362 |
// compilers to be ints. To avoid going and fixing all their uses, |
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diff
changeset
|
363 |
// I'm declaring them as ints. I'm not anticipating heap region |
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diff
changeset
|
364 |
// sizes to reach anywhere near 2g, so using an int here is safe. |
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diff
changeset
|
365 |
static int GrainBytes; |
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diff
changeset
|
366 |
static int GrainWords; |
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diff
changeset
|
367 |
static int CardsPerRegion; |
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diff
changeset
|
368 |
|
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diff
changeset
|
369 |
// It sets up the heap region size (GrainBytes / GrainWords), as |
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diff
changeset
|
370 |
// well as other related fields that are based on the heap region |
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diff
changeset
|
371 |
// size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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diff
changeset
|
372 |
// CardsPerRegion). All those fields are considered constant |
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diff
changeset
|
373 |
// throughout the JVM's execution, therefore they should only be set |
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parents:
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diff
changeset
|
374 |
// up once during initialization time. |
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diff
changeset
|
375 |
static void setup_heap_region_size(uintx min_heap_size); |
1374 | 376 |
|
1387 | 377 |
enum ClaimValues { |
378 |
InitialClaimValue = 0, |
|
379 |
FinalCountClaimValue = 1, |
|
380 |
NoteEndClaimValue = 2, |
|
1422 | 381 |
ScrubRemSetClaimValue = 3, |
2152
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6760309: G1: update remembered sets during Full GCs
apetrusenko
parents:
2013
diff
changeset
|
382 |
ParVerifyClaimValue = 4, |
99356e7f31b1
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apetrusenko
parents:
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diff
changeset
|
383 |
RebuildRSClaimValue = 5 |
1387 | 384 |
}; |
385 |
||
7905
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changeset
|
386 |
inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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parents:
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changeset
|
387 |
assert(is_young(), "we can only skip BOT updates on young regions"); |
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tonyp
parents:
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diff
changeset
|
388 |
return ContiguousSpace::par_allocate(word_size); |
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parents:
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changeset
|
389 |
} |
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diff
changeset
|
390 |
inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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tonyp
parents:
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diff
changeset
|
391 |
assert(is_young(), "we can only skip BOT updates on young regions"); |
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tonyp
parents:
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diff
changeset
|
392 |
return ContiguousSpace::allocate(word_size); |
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tonyp
parents:
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diff
changeset
|
393 |
} |
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changeset
|
394 |
|
1374 | 395 |
// If this region is a member of a HeapRegionSeq, the index in that |
396 |
// sequence, otherwise -1. |
|
9989 | 397 |
size_t hrs_index() const { return _hrs_index; } |
1374 | 398 |
|
399 |
// The number of bytes marked live in the region in the last marking phase. |
|
400 |
size_t marked_bytes() { return _prev_marked_bytes; } |
|
8930
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
401 |
size_t live_bytes() { |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
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diff
changeset
|
402 |
return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
52368505ee8e
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tonyp
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diff
changeset
|
403 |
} |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
404 |
|
1374 | 405 |
// The number of bytes counted in the next marking. |
406 |
size_t next_marked_bytes() { return _next_marked_bytes; } |
|
407 |
// The number of bytes live wrt the next marking. |
|
408 |
size_t next_live_bytes() { |
|
8930
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
409 |
return |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8928
diff
changeset
|
410 |
(top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
1374 | 411 |
} |
412 |
||
413 |
// A lower bound on the amount of garbage bytes in the region. |
|
414 |
size_t garbage_bytes() { |
|
415 |
size_t used_at_mark_start_bytes = |
|
416 |
(prev_top_at_mark_start() - bottom()) * HeapWordSize; |
|
417 |
assert(used_at_mark_start_bytes >= marked_bytes(), |
|
418 |
"Can't mark more than we have."); |
|
419 |
return used_at_mark_start_bytes - marked_bytes(); |
|
420 |
} |
|
421 |
||
422 |
// An upper bound on the number of live bytes in the region. |
|
423 |
size_t max_live_bytes() { return used() - garbage_bytes(); } |
|
424 |
||
425 |
void add_to_marked_bytes(size_t incr_bytes) { |
|
426 |
_next_marked_bytes = _next_marked_bytes + incr_bytes; |
|
427 |
guarantee( _next_marked_bytes <= used(), "invariant" ); |
|
428 |
} |
|
429 |
||
430 |
void zero_marked_bytes() { |
|
431 |
_prev_marked_bytes = _next_marked_bytes = 0; |
|
432 |
} |
|
433 |
||
1387 | 434 |
bool isHumongous() const { return _humongous_type != NotHumongous; } |
435 |
bool startsHumongous() const { return _humongous_type == StartsHumongous; } |
|
436 |
bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } |
|
1374 | 437 |
// For a humongous region, region in which it starts. |
438 |
HeapRegion* humongous_start_region() const { |
|
439 |
return _humongous_start_region; |
|
440 |
} |
|
441 |
||
7904
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
442 |
// Makes the current region be a "starts humongous" region, i.e., |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
443 |
// the first region in a series of one or more contiguous regions |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
444 |
// that will contain a single "humongous" object. The two parameters |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
445 |
// are as follows: |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
446 |
// |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
447 |
// new_top : The new value of the top field of this region which |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
448 |
// points to the end of the humongous object that's being |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
449 |
// allocated. If there is more than one region in the series, top |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
450 |
// will lie beyond this region's original end field and on the last |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
451 |
// region in the series. |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
452 |
// |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
453 |
// new_end : The new value of the end field of this region which |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
454 |
// points to the end of the last region in the series. If there is |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
455 |
// one region in the series (namely: this one) end will be the same |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
456 |
// as the original end of this region. |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
457 |
// |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
458 |
// Updating top and end as described above makes this region look as |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
459 |
// 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
|
460 |
// 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
diff
changeset
|
461 |
// ensures that the space (capacity / allocated) taken up by all |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
462 |
// 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
|
463 |
// "starts humongous" regions and by ignoring the "continues |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
464 |
// humongous" regions. |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
465 |
void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
1374 | 466 |
|
7904
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
467 |
// Makes the current region be a "continues humongous' |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
468 |
// region. first_hr is the "start humongous" region of the series |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
469 |
// which this region will be part of. |
e90e097fced4
7007068: G1: refine the BOT during evac failure handling
tonyp
parents:
7397
diff
changeset
|
470 |
void set_continuesHumongous(HeapRegion* first_hr); |
1374 | 471 |
|
7923 | 472 |
// Unsets the humongous-related fields on the region. |
473 |
void set_notHumongous(); |
|
474 |
||
1374 | 475 |
// If the region has a remembered set, return a pointer to it. |
476 |
HeapRegionRemSet* rem_set() const { |
|
477 |
return _rem_set; |
|
478 |
} |
|
479 |
||
480 |
// True iff the region is in current collection_set. |
|
481 |
bool in_collection_set() const { |
|
482 |
return _in_collection_set; |
|
483 |
} |
|
484 |
void set_in_collection_set(bool b) { |
|
485 |
_in_collection_set = b; |
|
486 |
} |
|
487 |
HeapRegion* next_in_collection_set() { |
|
488 |
assert(in_collection_set(), "should only invoke on member of CS."); |
|
489 |
assert(_next_in_special_set == NULL || |
|
490 |
_next_in_special_set->in_collection_set(), |
|
491 |
"Malformed CS."); |
|
492 |
return _next_in_special_set; |
|
493 |
} |
|
494 |
void set_next_in_collection_set(HeapRegion* r) { |
|
495 |
assert(in_collection_set(), "should only invoke on member of CS."); |
|
496 |
assert(r == NULL || r->in_collection_set(), "Malformed CS."); |
|
497 |
_next_in_special_set = r; |
|
498 |
} |
|
499 |
||
500 |
// True iff it is or has been an allocation region in the current |
|
501 |
// collection pause. |
|
502 |
bool is_gc_alloc_region() const { |
|
503 |
return _is_gc_alloc_region; |
|
504 |
} |
|
505 |
void set_is_gc_alloc_region(bool b) { |
|
506 |
_is_gc_alloc_region = b; |
|
507 |
} |
|
508 |
HeapRegion* next_gc_alloc_region() { |
|
509 |
assert(is_gc_alloc_region(), "should only invoke on member of CS."); |
|
510 |
assert(_next_in_special_set == NULL || |
|
511 |
_next_in_special_set->is_gc_alloc_region(), |
|
512 |
"Malformed CS."); |
|
513 |
return _next_in_special_set; |
|
514 |
} |
|
515 |
void set_next_gc_alloc_region(HeapRegion* r) { |
|
516 |
assert(is_gc_alloc_region(), "should only invoke on member of CS."); |
|
517 |
assert(r == NULL || r->is_gc_alloc_region(), "Malformed CS."); |
|
518 |
_next_in_special_set = r; |
|
519 |
} |
|
520 |
||
7923 | 521 |
// Methods used by the HeapRegionSetBase class and subclasses. |
1374 | 522 |
|
7923 | 523 |
// Getter and setter for the next field used to link regions into |
524 |
// linked lists. |
|
525 |
HeapRegion* next() { return _next; } |
|
526 |
||
527 |
void set_next(HeapRegion* next) { _next = next; } |
|
1374 | 528 |
|
7923 | 529 |
// Every region added to a set is tagged with a reference to that |
530 |
// set. This is used for doing consistency checking to make sure that |
|
531 |
// the contents of a set are as they should be and it's only |
|
532 |
// available in non-product builds. |
|
533 |
#ifdef ASSERT |
|
534 |
void set_containing_set(HeapRegionSetBase* containing_set) { |
|
535 |
assert((containing_set == NULL && _containing_set != NULL) || |
|
536 |
(containing_set != NULL && _containing_set == NULL), |
|
537 |
err_msg("containing_set: "PTR_FORMAT" " |
|
538 |
"_containing_set: "PTR_FORMAT, |
|
539 |
containing_set, _containing_set)); |
|
540 |
||
541 |
_containing_set = containing_set; |
|
8680 | 542 |
} |
1374 | 543 |
|
7923 | 544 |
HeapRegionSetBase* containing_set() { return _containing_set; } |
545 |
#else // ASSERT |
|
546 |
void set_containing_set(HeapRegionSetBase* containing_set) { } |
|
1374 | 547 |
|
8680 | 548 |
// containing_set() is only used in asserts so there's no reason |
7923 | 549 |
// to provide a dummy version of it. |
550 |
#endif // ASSERT |
|
1374 | 551 |
|
7923 | 552 |
// If we want to remove regions from a list in bulk we can simply tag |
553 |
// them with the pending_removal tag and call the |
|
554 |
// remove_all_pending() method on the list. |
|
1374 | 555 |
|
7923 | 556 |
bool pending_removal() { return _pending_removal; } |
557 |
||
558 |
void set_pending_removal(bool pending_removal) { |
|
8680 | 559 |
if (pending_removal) { |
560 |
assert(!_pending_removal && containing_set() != NULL, |
|
561 |
"can only set pending removal to true if it's false and " |
|
562 |
"the region belongs to a region set"); |
|
563 |
} else { |
|
564 |
assert( _pending_removal && containing_set() == NULL, |
|
565 |
"can only set pending removal to false if it's true and " |
|
566 |
"the region does not belong to a region set"); |
|
567 |
} |
|
7923 | 568 |
|
569 |
_pending_removal = pending_removal; |
|
1374 | 570 |
} |
571 |
||
572 |
HeapRegion* get_next_young_region() { return _next_young_region; } |
|
573 |
void set_next_young_region(HeapRegion* hr) { |
|
574 |
_next_young_region = hr; |
|
575 |
} |
|
576 |
||
2883
406d1e6d1aa1
6819065: G1: eliminate high serial card table clearing time
apetrusenko
parents:
2344
diff
changeset
|
577 |
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
|
578 |
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
|
579 |
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
|
580 |
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
|
581 |
|
9989 | 582 |
HeapWord* orig_end() { return _orig_end; } |
583 |
||
1374 | 584 |
// Allows logical separation between objects allocated before and after. |
585 |
void save_marks(); |
|
586 |
||
587 |
// Reset HR stuff to default values. |
|
588 |
void hr_clear(bool par, bool clear_space); |
|
9418
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
8930
diff
changeset
|
589 |
void par_clear(); |
1374 | 590 |
|
1388 | 591 |
void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
1374 | 592 |
|
593 |
// Get the start of the unmarked area in this region. |
|
594 |
HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } |
|
595 |
HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } |
|
596 |
||
597 |
// Apply "cl->do_oop" to (the addresses of) all reference fields in objects |
|
598 |
// allocated in the current region before the last call to "save_mark". |
|
599 |
void oop_before_save_marks_iterate(OopClosure* cl); |
|
600 |
||
601 |
// This call determines the "filter kind" argument that will be used for |
|
602 |
// the next call to "new_dcto_cl" on this region with the "traditional" |
|
603 |
// signature (i.e., the call below.) The default, in the absence of a |
|
604 |
// preceding call to this method, is "NoFilterKind", and a call to this |
|
605 |
// method is necessary for each such call, or else it reverts to the |
|
606 |
// default. |
|
607 |
// (This is really ugly, but all other methods I could think of changed a |
|
608 |
// lot of main-line code for G1.) |
|
609 |
void set_next_filter_kind(HeapRegionDCTOC::FilterKind nfk) { |
|
610 |
_next_fk = nfk; |
|
611 |
} |
|
612 |
||
613 |
DirtyCardToOopClosure* |
|
614 |
new_dcto_closure(OopClosure* cl, |
|
615 |
CardTableModRefBS::PrecisionStyle precision, |
|
616 |
HeapRegionDCTOC::FilterKind fk); |
|
617 |
||
618 |
#if WHASSUP |
|
619 |
DirtyCardToOopClosure* |
|
620 |
new_dcto_closure(OopClosure* cl, |
|
621 |
CardTableModRefBS::PrecisionStyle precision, |
|
622 |
HeapWord* boundary) { |
|
623 |
assert(boundary == NULL, "This arg doesn't make sense here."); |
|
624 |
DirtyCardToOopClosure* res = new_dcto_closure(cl, precision, _next_fk); |
|
625 |
_next_fk = HeapRegionDCTOC::NoFilterKind; |
|
626 |
return res; |
|
627 |
} |
|
628 |
#endif |
|
629 |
||
630 |
// |
|
631 |
// Note the start or end of marking. This tells the heap region |
|
632 |
// that the collector is about to start or has finished (concurrently) |
|
633 |
// marking the heap. |
|
634 |
// |
|
635 |
||
636 |
// Note the start of a marking phase. Record the |
|
637 |
// start of the unmarked area of the region here. |
|
638 |
void note_start_of_marking(bool during_initial_mark) { |
|
639 |
init_top_at_conc_mark_count(); |
|
640 |
_next_marked_bytes = 0; |
|
641 |
if (during_initial_mark && is_young() && !is_survivor()) |
|
642 |
_next_top_at_mark_start = bottom(); |
|
643 |
else |
|
644 |
_next_top_at_mark_start = top(); |
|
645 |
} |
|
646 |
||
647 |
// Note the end of a marking phase. Install the start of |
|
648 |
// the unmarked area that was captured at start of marking. |
|
649 |
void note_end_of_marking() { |
|
650 |
_prev_top_at_mark_start = _next_top_at_mark_start; |
|
651 |
_prev_marked_bytes = _next_marked_bytes; |
|
652 |
_next_marked_bytes = 0; |
|
653 |
||
654 |
guarantee(_prev_marked_bytes <= |
|
655 |
(size_t) (prev_top_at_mark_start() - bottom()) * HeapWordSize, |
|
656 |
"invariant"); |
|
657 |
} |
|
658 |
||
659 |
// After an evacuation, we need to update _next_top_at_mark_start |
|
660 |
// to be the current top. Note this is only valid if we have only |
|
661 |
// ever evacuated into this region. If we evacuate, allocate, and |
|
662 |
// then evacuate we are in deep doodoo. |
|
663 |
void note_end_of_copying() { |
|
4024
b90cfcea7031
6847956: G1: crash in oopDesc*G1ParCopyHelper::copy_to_survivor_space(oopDesc*)
tonyp
parents:
4023
diff
changeset
|
664 |
assert(top() >= _next_top_at_mark_start, "Increase only"); |
b90cfcea7031
6847956: G1: crash in oopDesc*G1ParCopyHelper::copy_to_survivor_space(oopDesc*)
tonyp
parents:
4023
diff
changeset
|
665 |
_next_top_at_mark_start = top(); |
1374 | 666 |
} |
667 |
||
668 |
// Returns "false" iff no object in the region was allocated when the |
|
669 |
// last mark phase ended. |
|
670 |
bool is_marked() { return _prev_top_at_mark_start != bottom(); } |
|
671 |
||
672 |
// If "is_marked()" is true, then this is the index of the region in |
|
673 |
// an array constructed at the end of marking of the regions in a |
|
674 |
// "desirability" order. |
|
675 |
int sort_index() { |
|
676 |
return _sort_index; |
|
677 |
} |
|
678 |
void set_sort_index(int i) { |
|
679 |
_sort_index = i; |
|
680 |
} |
|
681 |
||
682 |
void init_top_at_conc_mark_count() { |
|
683 |
_top_at_conc_mark_count = bottom(); |
|
684 |
} |
|
685 |
||
686 |
void set_top_at_conc_mark_count(HeapWord *cur) { |
|
687 |
assert(bottom() <= cur && cur <= end(), "Sanity."); |
|
688 |
_top_at_conc_mark_count = cur; |
|
689 |
} |
|
690 |
||
691 |
HeapWord* top_at_conc_mark_count() { |
|
692 |
return _top_at_conc_mark_count; |
|
693 |
} |
|
694 |
||
695 |
void reset_during_compaction() { |
|
696 |
guarantee( isHumongous() && startsHumongous(), |
|
697 |
"should only be called for humongous regions"); |
|
698 |
||
699 |
zero_marked_bytes(); |
|
700 |
init_top_at_mark_start(); |
|
701 |
} |
|
702 |
||
703 |
// <PREDICTION> |
|
704 |
void calc_gc_efficiency(void); |
|
705 |
double gc_efficiency() { return _gc_efficiency;} |
|
706 |
// </PREDICTION> |
|
707 |
||
708 |
bool is_young() const { return _young_type != NotYoung; } |
|
709 |
bool is_survivor() const { return _young_type == Survivor; } |
|
710 |
||
711 |
int young_index_in_cset() const { return _young_index_in_cset; } |
|
712 |
void set_young_index_in_cset(int index) { |
|
713 |
assert( (index == -1) || is_young(), "pre-condition" ); |
|
714 |
_young_index_in_cset = index; |
|
715 |
} |
|
716 |
||
717 |
int age_in_surv_rate_group() { |
|
718 |
assert( _surv_rate_group != NULL, "pre-condition" ); |
|
719 |
assert( _age_index > -1, "pre-condition" ); |
|
720 |
return _surv_rate_group->age_in_group(_age_index); |
|
721 |
} |
|
722 |
||
723 |
void record_surv_words_in_group(size_t words_survived) { |
|
724 |
assert( _surv_rate_group != NULL, "pre-condition" ); |
|
725 |
assert( _age_index > -1, "pre-condition" ); |
|
726 |
int age_in_group = age_in_surv_rate_group(); |
|
727 |
_surv_rate_group->record_surviving_words(age_in_group, words_survived); |
|
728 |
} |
|
729 |
||
730 |
int age_in_surv_rate_group_cond() { |
|
731 |
if (_surv_rate_group != NULL) |
|
732 |
return age_in_surv_rate_group(); |
|
733 |
else |
|
734 |
return -1; |
|
735 |
} |
|
736 |
||
737 |
SurvRateGroup* surv_rate_group() { |
|
738 |
return _surv_rate_group; |
|
739 |
} |
|
740 |
||
741 |
void install_surv_rate_group(SurvRateGroup* surv_rate_group) { |
|
742 |
assert( surv_rate_group != NULL, "pre-condition" ); |
|
743 |
assert( _surv_rate_group == NULL, "pre-condition" ); |
|
744 |
assert( is_young(), "pre-condition" ); |
|
745 |
||
746 |
_surv_rate_group = surv_rate_group; |
|
747 |
_age_index = surv_rate_group->next_age_index(); |
|
748 |
} |
|
749 |
||
750 |
void uninstall_surv_rate_group() { |
|
751 |
if (_surv_rate_group != NULL) { |
|
752 |
assert( _age_index > -1, "pre-condition" ); |
|
753 |
assert( is_young(), "pre-condition" ); |
|
754 |
||
755 |
_surv_rate_group = NULL; |
|
756 |
_age_index = -1; |
|
757 |
} else { |
|
758 |
assert( _age_index == -1, "pre-condition" ); |
|
759 |
} |
|
760 |
} |
|
761 |
||
762 |
void set_young() { set_young_type(Young); } |
|
763 |
||
764 |
void set_survivor() { set_young_type(Survivor); } |
|
765 |
||
766 |
void set_not_young() { set_young_type(NotYoung); } |
|
767 |
||
768 |
// Determine if an object has been allocated since the last |
|
769 |
// mark performed by the collector. This returns true iff the object |
|
770 |
// is within the unmarked area of the region. |
|
771 |
bool obj_allocated_since_prev_marking(oop obj) const { |
|
772 |
return (HeapWord *) obj >= prev_top_at_mark_start(); |
|
773 |
} |
|
774 |
bool obj_allocated_since_next_marking(oop obj) const { |
|
775 |
return (HeapWord *) obj >= next_top_at_mark_start(); |
|
776 |
} |
|
777 |
||
778 |
// For parallel heapRegion traversal. |
|
779 |
bool claimHeapRegion(int claimValue); |
|
780 |
jint claim_value() { return _claimed; } |
|
781 |
// Use this carefully: only when you're sure no one is claiming... |
|
782 |
void set_claim_value(int claimValue) { _claimed = claimValue; } |
|
783 |
||
784 |
// Returns the "evacuation_failed" property of the region. |
|
785 |
bool evacuation_failed() { return _evacuation_failed; } |
|
786 |
||
787 |
// Sets the "evacuation_failed" property of the region. |
|
788 |
void set_evacuation_failed(bool b) { |
|
789 |
_evacuation_failed = b; |
|
790 |
||
791 |
if (b) { |
|
792 |
init_top_at_conc_mark_count(); |
|
793 |
_next_marked_bytes = 0; |
|
794 |
} |
|
795 |
} |
|
796 |
||
797 |
// Requires that "mr" be entirely within the region. |
|
798 |
// Apply "cl->do_object" to all objects that intersect with "mr". |
|
799 |
// If the iteration encounters an unparseable portion of the region, |
|
800 |
// or if "cl->abort()" is true after a closure application, |
|
801 |
// terminate the iteration and return the address of the start of the |
|
802 |
// subregion that isn't done. (The two can be distinguished by querying |
|
803 |
// "cl->abort()".) Return of "NULL" indicates that the iteration |
|
804 |
// completed. |
|
805 |
HeapWord* |
|
806 |
object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); |
|
807 |
||
9418
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
8930
diff
changeset
|
808 |
// filter_young: if true and the region is a young region then we |
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
8930
diff
changeset
|
809 |
// skip the iteration. |
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
8930
diff
changeset
|
810 |
// 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...)
tonyp
parents:
8930
diff
changeset
|
811 |
// 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...)
tonyp
parents:
8930
diff
changeset
|
812 |
// iteration. |
1374 | 813 |
HeapWord* |
814 |
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
|
815 |
FilterOutOfRegionClosure* cl, |
9418
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
8930
diff
changeset
|
816 |
bool filter_young, |
32a87dd6b746
7035144: G1: nightly failure: Non-dirty cards in region that should be dirty (failures still exist...)
tonyp
parents:
8930
diff
changeset
|
817 |
jbyte* card_ptr); |
1374 | 818 |
|
819 |
// A version of block start that is guaranteed to find *some* block |
|
820 |
// boundary at or before "p", but does not object iteration, and may |
|
821 |
// therefore be used safely when the heap is unparseable. |
|
822 |
HeapWord* block_start_careful(const void* p) const { |
|
823 |
return _offsets.block_start_careful(p); |
|
824 |
} |
|
825 |
||
826 |
// Requires that "addr" is within the region. Returns the start of the |
|
827 |
// first ("careful") block that starts at or after "addr", or else the |
|
828 |
// "end" of the region if there is no such block. |
|
829 |
HeapWord* next_block_start_careful(HeapWord* addr); |
|
830 |
||
5350
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
831 |
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
|
832 |
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
|
833 |
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:
4024
diff
changeset
|
834 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
835 |
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
|
836 |
_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
|
837 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
838 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
839 |
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
|
840 |
_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
|
841 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
842 |
|
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
843 |
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
|
844 |
_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
|
845 |
} |
cccf0925702e
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
4024
diff
changeset
|
846 |
|
1374 | 847 |
#define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
848 |
virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); |
|
849 |
SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) |
|
850 |
||
851 |
CompactibleSpace* next_compaction_space() const; |
|
852 |
||
853 |
virtual void reset_after_compaction(); |
|
854 |
||
855 |
void print() const; |
|
856 |
void print_on(outputStream* st) const; |
|
857 |
||
3000 | 858 |
// use_prev_marking == true -> use "prev" marking information, |
859 |
// use_prev_marking == false -> use "next" marking information |
|
860 |
// NOTE: Only the "prev" marking information is guaranteed to be |
|
861 |
// consistent most of the time, so most calls to this should use |
|
862 |
// use_prev_marking == true. Currently, there is only one case where |
|
863 |
// this is called with use_prev_marking == false, which is to verify |
|
864 |
// the "next" marking information at the end of remark. |
|
4023
6c3401503290
6882730: G1: parallel heap verification messes up region dump
tonyp
parents:
3697
diff
changeset
|
865 |
void verify(bool allow_dirty, bool use_prev_marking, bool *failures) const; |
3000 | 866 |
|
867 |
// Override; it uses the "prev" marking information |
|
1374 | 868 |
virtual void verify(bool allow_dirty) const; |
869 |
}; |
|
870 |
||
871 |
// HeapRegionClosure is used for iterating over regions. |
|
872 |
// Terminates the iteration when the "doHeapRegion" method returns "true". |
|
873 |
class HeapRegionClosure : public StackObj { |
|
874 |
friend class HeapRegionSeq; |
|
875 |
friend class G1CollectedHeap; |
|
876 |
||
877 |
bool _complete; |
|
878 |
void incomplete() { _complete = false; } |
|
879 |
||
880 |
public: |
|
881 |
HeapRegionClosure(): _complete(true) {} |
|
882 |
||
883 |
// Typically called on each region until it returns true. |
|
884 |
virtual bool doHeapRegion(HeapRegion* r) = 0; |
|
885 |
||
886 |
// True after iteration if the closure was applied to all heap regions |
|
887 |
// and returned "false" in all cases. |
|
888 |
bool complete() { return _complete; } |
|
889 |
}; |
|
890 |
||
891 |
#endif // SERIALGC |
|
7397 | 892 |
|
893 |
#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |