author | kbarrett |
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/* |
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* Copyright (c) 2001, 2015, 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_CONCURRENTMARK_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |
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#include "classfile/javaClasses.hpp" |
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#include "gc_implementation/g1/heapRegionSet.hpp" |
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#include "gc_implementation/g1/g1RegionToSpaceMapper.hpp" |
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#include "gc_implementation/shared/gcId.hpp" |
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#include "utilities/taskqueue.hpp" |
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class G1CollectedHeap; |
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class CMBitMap; |
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class CMTask; |
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class ConcurrentMark; |
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typedef GenericTaskQueue<oop, mtGC> CMTaskQueue; |
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typedef GenericTaskQueueSet<CMTaskQueue, mtGC> CMTaskQueueSet; |
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// Closure used by CM during concurrent reference discovery |
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// and reference processing (during remarking) to determine |
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// if a particular object is alive. It is primarily used |
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// to determine if referents of discovered reference objects |
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// are alive. An instance is also embedded into the |
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// reference processor as the _is_alive_non_header field |
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class G1CMIsAliveClosure: public BoolObjectClosure { |
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G1CollectedHeap* _g1; |
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public: |
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G1CMIsAliveClosure(G1CollectedHeap* g1) : _g1(g1) { } |
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bool do_object_b(oop obj); |
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}; |
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// A generic CM bit map. This is essentially a wrapper around the BitMap |
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// class, with one bit per (1<<_shifter) HeapWords. |
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class CMBitMapRO VALUE_OBJ_CLASS_SPEC { |
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protected: |
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HeapWord* _bmStartWord; // base address of range covered by map |
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size_t _bmWordSize; // map size (in #HeapWords covered) |
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const int _shifter; // map to char or bit |
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BitMap _bm; // the bit map itself |
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public: |
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// constructor |
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CMBitMapRO(int shifter); |
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enum { do_yield = true }; |
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// inquiries |
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HeapWord* startWord() const { return _bmStartWord; } |
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size_t sizeInWords() const { return _bmWordSize; } |
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// the following is one past the last word in space |
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HeapWord* endWord() const { return _bmStartWord + _bmWordSize; } |
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// read marks |
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bool isMarked(HeapWord* addr) const { |
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assert(_bmStartWord <= addr && addr < (_bmStartWord + _bmWordSize), |
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"outside underlying space?"); |
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return _bm.at(heapWordToOffset(addr)); |
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} |
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// iteration |
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inline bool iterate(BitMapClosure* cl, MemRegion mr); |
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inline bool iterate(BitMapClosure* cl); |
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// Return the address corresponding to the next marked bit at or after |
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// "addr", and before "limit", if "limit" is non-NULL. If there is no |
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// such bit, returns "limit" if that is non-NULL, or else "endWord()". |
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HeapWord* getNextMarkedWordAddress(const HeapWord* addr, |
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const HeapWord* limit = NULL) const; |
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// Return the address corresponding to the next unmarked bit at or after |
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// "addr", and before "limit", if "limit" is non-NULL. If there is no |
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// such bit, returns "limit" if that is non-NULL, or else "endWord()". |
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HeapWord* getNextUnmarkedWordAddress(const HeapWord* addr, |
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const HeapWord* limit = NULL) const; |
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// conversion utilities |
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HeapWord* offsetToHeapWord(size_t offset) const { |
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return _bmStartWord + (offset << _shifter); |
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} |
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size_t heapWordToOffset(const HeapWord* addr) const { |
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return pointer_delta(addr, _bmStartWord) >> _shifter; |
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} |
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int heapWordDiffToOffsetDiff(size_t diff) const; |
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// The argument addr should be the start address of a valid object |
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HeapWord* nextObject(HeapWord* addr) { |
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oop obj = (oop) addr; |
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HeapWord* res = addr + obj->size(); |
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assert(offsetToHeapWord(heapWordToOffset(res)) == res, "sanity"); |
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return res; |
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} |
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void print_on_error(outputStream* st, const char* prefix) const; |
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// debugging |
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NOT_PRODUCT(bool covers(MemRegion rs) const;) |
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}; |
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class CMBitMapMappingChangedListener : public G1MappingChangedListener { |
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private: |
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CMBitMap* _bm; |
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public: |
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CMBitMapMappingChangedListener() : _bm(NULL) {} |
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void set_bitmap(CMBitMap* bm) { _bm = bm; } |
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virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled); |
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}; |
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class CMBitMap : public CMBitMapRO { |
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private: |
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CMBitMapMappingChangedListener _listener; |
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public: |
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static size_t compute_size(size_t heap_size); |
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// Returns the amount of bytes on the heap between two marks in the bitmap. |
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static size_t mark_distance(); |
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// Returns how many bytes (or bits) of the heap a single byte (or bit) of the |
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// mark bitmap corresponds to. This is the same as the mark distance above. |
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static size_t heap_map_factor() { |
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return mark_distance(); |
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} |
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CMBitMap() : CMBitMapRO(LogMinObjAlignment), _listener() { _listener.set_bitmap(this); } |
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// Initializes the underlying BitMap to cover the given area. |
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void initialize(MemRegion heap, G1RegionToSpaceMapper* storage); |
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// Write marks. |
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inline void mark(HeapWord* addr); |
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inline void clear(HeapWord* addr); |
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inline bool parMark(HeapWord* addr); |
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inline bool parClear(HeapWord* addr); |
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void markRange(MemRegion mr); |
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void clearRange(MemRegion mr); |
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// Starting at the bit corresponding to "addr" (inclusive), find the next |
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// "1" bit, if any. This bit starts some run of consecutive "1"'s; find |
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// the end of this run (stopping at "end_addr"). Return the MemRegion |
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// covering from the start of the region corresponding to the first bit |
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// of the run to the end of the region corresponding to the last bit of |
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// the run. If there is no "1" bit at or after "addr", return an empty |
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// MemRegion. |
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MemRegion getAndClearMarkedRegion(HeapWord* addr, HeapWord* end_addr); |
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// Clear the whole mark bitmap. |
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void clearAll(); |
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}; |
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// Represents a marking stack used by ConcurrentMarking in the G1 collector. |
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class CMMarkStack VALUE_OBJ_CLASS_SPEC { |
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VirtualSpace _virtual_space; // Underlying backing store for actual stack |
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ConcurrentMark* _cm; |
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oop* _base; // bottom of stack |
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jint _index; // one more than last occupied index |
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jint _capacity; // max #elements |
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jint _saved_index; // value of _index saved at start of GC |
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bool _overflow; |
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bool _should_expand; |
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DEBUG_ONLY(bool _drain_in_progress;) |
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DEBUG_ONLY(bool _drain_in_progress_yields;) |
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oop pop() { |
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if (!isEmpty()) { |
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return _base[--_index] ; |
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} |
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return NULL; |
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} |
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public: |
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CMMarkStack(ConcurrentMark* cm); |
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~CMMarkStack(); |
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bool allocate(size_t capacity); |
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// Pushes the first "n" elements of "ptr_arr" on the stack. |
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// Locking impl: concurrency is allowed only with |
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// "par_push_arr" and/or "par_pop_arr" operations, which use the same |
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// locking strategy. |
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void par_push_arr(oop* ptr_arr, int n); |
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// If returns false, the array was empty. Otherwise, removes up to "max" |
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// elements from the stack, and transfers them to "ptr_arr" in an |
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// unspecified order. The actual number transferred is given in "n" ("n |
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// == 0" is deliberately redundant with the return value.) Locking impl: |
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// concurrency is allowed only with "par_push_arr" and/or "par_pop_arr" |
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// operations, which use the same locking strategy. |
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bool par_pop_arr(oop* ptr_arr, int max, int* n); |
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// Drain the mark stack, applying the given closure to all fields of |
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// objects on the stack. (That is, continue until the stack is empty, |
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// even if closure applications add entries to the stack.) The "bm" |
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// argument, if non-null, may be used to verify that only marked objects |
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// are on the mark stack. If "yield_after" is "true", then the |
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// concurrent marker performing the drain offers to yield after |
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// processing each object. If a yield occurs, stops the drain operation |
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// and returns false. Otherwise, returns true. |
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template<class OopClosureClass> |
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bool drain(OopClosureClass* cl, CMBitMap* bm, bool yield_after = false); |
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bool isEmpty() { return _index == 0; } |
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int maxElems() { return _capacity; } |
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bool overflow() { return _overflow; } |
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void clear_overflow() { _overflow = false; } |
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bool should_expand() const { return _should_expand; } |
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void set_should_expand(); |
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// Expand the stack, typically in response to an overflow condition |
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void expand(); |
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int size() { return _index; } |
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void setEmpty() { _index = 0; clear_overflow(); } |
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// Record the current index. |
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void note_start_of_gc(); |
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|
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// Make sure that we have not added any entries to the stack during GC. |
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void note_end_of_gc(); |
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|
1374 | 249 |
// iterate over the oops in the mark stack, up to the bound recorded via |
250 |
// the call above. |
|
251 |
void oops_do(OopClosure* f); |
|
252 |
}; |
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class ForceOverflowSettings VALUE_OBJ_CLASS_SPEC { |
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private: |
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#ifndef PRODUCT |
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uintx _num_remaining; |
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bool _force; |
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#endif // !defined(PRODUCT) |
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|
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public: |
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void init() PRODUCT_RETURN; |
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void update() PRODUCT_RETURN; |
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bool should_force() PRODUCT_RETURN_( return false; ); |
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}; |
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|
1374 | 267 |
// this will enable a variety of different statistics per GC task |
268 |
#define _MARKING_STATS_ 0 |
|
269 |
// this will enable the higher verbose levels |
|
270 |
#define _MARKING_VERBOSE_ 0 |
|
271 |
||
272 |
#if _MARKING_STATS_ |
|
273 |
#define statsOnly(statement) \ |
|
274 |
do { \ |
|
275 |
statement ; \ |
|
276 |
} while (0) |
|
277 |
#else // _MARKING_STATS_ |
|
278 |
#define statsOnly(statement) \ |
|
279 |
do { \ |
|
280 |
} while (0) |
|
281 |
#endif // _MARKING_STATS_ |
|
282 |
||
283 |
typedef enum { |
|
284 |
no_verbose = 0, // verbose turned off |
|
285 |
stats_verbose, // only prints stats at the end of marking |
|
286 |
low_verbose, // low verbose, mostly per region and per major event |
|
287 |
medium_verbose, // a bit more detailed than low |
|
288 |
high_verbose // per object verbose |
|
289 |
} CMVerboseLevel; |
|
290 |
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class YoungList; |
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// Root Regions are regions that are not empty at the beginning of a |
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// marking cycle and which we might collect during an evacuation pause |
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// while the cycle is active. Given that, during evacuation pauses, we |
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// do not copy objects that are explicitly marked, what we have to do |
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// for the root regions is to scan them and mark all objects reachable |
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// from them. According to the SATB assumptions, we only need to visit |
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// each object once during marking. So, as long as we finish this scan |
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300 |
// before the next evacuation pause, we can copy the objects from the |
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// root regions without having to mark them or do anything else to them. |
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// |
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// Currently, we only support root region scanning once (at the start |
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// of the marking cycle) and the root regions are all the survivor |
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// regions populated during the initial-mark pause. |
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class CMRootRegions VALUE_OBJ_CLASS_SPEC { |
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private: |
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YoungList* _young_list; |
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ConcurrentMark* _cm; |
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|
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volatile bool _scan_in_progress; |
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volatile bool _should_abort; |
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HeapRegion* volatile _next_survivor; |
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314 |
|
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public: |
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316 |
CMRootRegions(); |
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// We actually do most of the initialization in this method. |
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void init(G1CollectedHeap* g1h, ConcurrentMark* cm); |
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319 |
|
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320 |
// Reset the claiming / scanning of the root regions. |
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321 |
void prepare_for_scan(); |
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322 |
|
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323 |
// Forces get_next() to return NULL so that the iteration aborts early. |
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324 |
void abort() { _should_abort = true; } |
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325 |
|
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326 |
// Return true if the CM thread are actively scanning root regions, |
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327 |
// false otherwise. |
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328 |
bool scan_in_progress() { return _scan_in_progress; } |
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329 |
|
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330 |
// Claim the next root region to scan atomically, or return NULL if |
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331 |
// all have been claimed. |
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332 |
HeapRegion* claim_next(); |
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333 |
|
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334 |
// Flag that we're done with root region scanning and notify anyone |
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335 |
// who's waiting on it. If aborted is false, assume that all regions |
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336 |
// have been claimed. |
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337 |
void scan_finished(); |
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338 |
|
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339 |
// If CM threads are still scanning root regions, wait until they |
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340 |
// are done. Return true if we had to wait, false otherwise. |
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341 |
bool wait_until_scan_finished(); |
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342 |
}; |
1374 | 343 |
|
344 |
class ConcurrentMarkThread; |
|
345 |
||
13195 | 346 |
class ConcurrentMark: public CHeapObj<mtGC> { |
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347 |
friend class CMMarkStack; |
1374 | 348 |
friend class ConcurrentMarkThread; |
349 |
friend class CMTask; |
|
350 |
friend class CMBitMapClosure; |
|
351 |
friend class CMRemarkTask; |
|
352 |
friend class CMConcurrentMarkingTask; |
|
353 |
friend class G1ParNoteEndTask; |
|
354 |
friend class CalcLiveObjectsClosure; |
|
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friend class G1CMRefProcTaskProxy; |
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friend class G1CMRefProcTaskExecutor; |
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friend class G1CMKeepAliveAndDrainClosure; |
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friend class G1CMDrainMarkingStackClosure; |
1374 | 359 |
|
360 |
protected: |
|
22551 | 361 |
ConcurrentMarkThread* _cmThread; // The thread doing the work |
362 |
G1CollectedHeap* _g1h; // The heap |
|
363 |
uint _parallel_marking_threads; // The number of marking |
|
364 |
// threads we're using |
|
365 |
uint _max_parallel_marking_threads; // Max number of marking |
|
366 |
// threads we'll ever use |
|
367 |
double _sleep_factor; // How much we have to sleep, with |
|
1374 | 368 |
// respect to the work we just did, to |
369 |
// meet the marking overhead goal |
|
22551 | 370 |
double _marking_task_overhead; // Marking target overhead for |
1374 | 371 |
// a single task |
372 |
||
22551 | 373 |
// Same as the two above, but for the cleanup task |
1374 | 374 |
double _cleanup_sleep_factor; |
375 |
double _cleanup_task_overhead; |
|
376 |
||
7923 | 377 |
FreeRegionList _cleanup_list; |
1374 | 378 |
|
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379 |
// Concurrent marking support structures |
1374 | 380 |
CMBitMap _markBitMap1; |
381 |
CMBitMap _markBitMap2; |
|
22551 | 382 |
CMBitMapRO* _prevMarkBitMap; // Completed mark bitmap |
383 |
CMBitMap* _nextMarkBitMap; // Under-construction mark bitmap |
|
1374 | 384 |
|
385 |
BitMap _region_bm; |
|
386 |
BitMap _card_bm; |
|
387 |
||
388 |
// Heap bounds |
|
389 |
HeapWord* _heap_start; |
|
390 |
HeapWord* _heap_end; |
|
391 |
||
22551 | 392 |
// Root region tracking and claiming |
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393 |
CMRootRegions _root_regions; |
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394 |
|
1374 | 395 |
// For gray objects |
22551 | 396 |
CMMarkStack _markStack; // Grey objects behind global finger |
397 |
HeapWord* volatile _finger; // The global finger, region aligned, |
|
1374 | 398 |
// always points to the end of the |
399 |
// last claimed region |
|
400 |
||
22551 | 401 |
// Marking tasks |
402 |
uint _max_worker_id;// Maximum worker id |
|
403 |
uint _active_tasks; // Task num currently active |
|
404 |
CMTask** _tasks; // Task queue array (max_worker_id len) |
|
405 |
CMTaskQueueSet* _task_queues; // Task queue set |
|
406 |
ParallelTaskTerminator _terminator; // For termination |
|
1374 | 407 |
|
22551 | 408 |
// Two sync barriers that are used to synchronize tasks when an |
1374 | 409 |
// overflow occurs. The algorithm is the following. All tasks enter |
410 |
// the first one to ensure that they have all stopped manipulating |
|
22551 | 411 |
// the global data structures. After they exit it, they re-initialize |
412 |
// their data structures and task 0 re-initializes the global data |
|
1374 | 413 |
// structures. Then, they enter the second sync barrier. This |
414 |
// ensure, that no task starts doing work before all data |
|
22551 | 415 |
// structures (local and global) have been re-initialized. When they |
1374 | 416 |
// exit it, they are free to start working again. |
417 |
WorkGangBarrierSync _first_overflow_barrier_sync; |
|
418 |
WorkGangBarrierSync _second_overflow_barrier_sync; |
|
419 |
||
22551 | 420 |
// This is set by any task, when an overflow on the global data |
421 |
// structures is detected |
|
1374 | 422 |
volatile bool _has_overflown; |
22551 | 423 |
// True: marking is concurrent, false: we're in remark |
1374 | 424 |
volatile bool _concurrent; |
22551 | 425 |
// Set at the end of a Full GC so that marking aborts |
1374 | 426 |
volatile bool _has_aborted; |
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427 |
GCId _aborted_gc_id; |
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|
428 |
|
22551 | 429 |
// Used when remark aborts due to an overflow to indicate that |
1374 | 430 |
// another concurrent marking phase should start |
431 |
volatile bool _restart_for_overflow; |
|
432 |
||
433 |
// This is true from the very start of concurrent marking until the |
|
434 |
// point when all the tasks complete their work. It is really used |
|
435 |
// to determine the points between the end of concurrent marking and |
|
436 |
// time of remark. |
|
437 |
volatile bool _concurrent_marking_in_progress; |
|
438 |
||
22551 | 439 |
// Verbose level |
1374 | 440 |
CMVerboseLevel _verbose_level; |
441 |
||
22551 | 442 |
// All of these times are in ms |
1374 | 443 |
NumberSeq _init_times; |
444 |
NumberSeq _remark_times; |
|
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445 |
NumberSeq _remark_mark_times; |
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446 |
NumberSeq _remark_weak_ref_times; |
1374 | 447 |
NumberSeq _cleanup_times; |
448 |
double _total_counting_time; |
|
449 |
double _total_rs_scrub_time; |
|
450 |
||
22551 | 451 |
double* _accum_task_vtime; // Accumulated task vtime |
1374 | 452 |
|
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453 |
FlexibleWorkGang* _parallel_workers; |
1374 | 454 |
|
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455 |
ForceOverflowSettings _force_overflow_conc; |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
456 |
ForceOverflowSettings _force_overflow_stw; |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
457 |
|
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
458 |
void weakRefsWorkParallelPart(BoolObjectClosure* is_alive, bool purged_classes); |
1374 | 459 |
void weakRefsWork(bool clear_all_soft_refs); |
460 |
||
461 |
void swapMarkBitMaps(); |
|
462 |
||
463 |
// It resets the global marking data structures, as well as the |
|
464 |
// task local ones; should be called during initial mark. |
|
465 |
void reset(); |
|
15090
18bfcc1bbe39
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
14740
diff
changeset
|
466 |
|
18bfcc1bbe39
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
14740
diff
changeset
|
467 |
// Resets all the marking data structures. Called when we have to restart |
18bfcc1bbe39
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
14740
diff
changeset
|
468 |
// marking or when marking completes (via set_non_marking_state below). |
18bfcc1bbe39
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
14740
diff
changeset
|
469 |
void reset_marking_state(bool clear_overflow = true); |
18bfcc1bbe39
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
14740
diff
changeset
|
470 |
|
18bfcc1bbe39
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
14740
diff
changeset
|
471 |
// We do this after we're done with marking so that the marking data |
22551 | 472 |
// structures are initialized to a sensible and predictable state. |
15090
18bfcc1bbe39
8004816: G1: Kitchensink failures after marking stack changes
johnc
parents:
14740
diff
changeset
|
473 |
void set_non_marking_state(); |
1374 | 474 |
|
16389
70f98431dd29
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
16388
diff
changeset
|
475 |
// Called to indicate how many threads are currently active. |
70f98431dd29
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
16388
diff
changeset
|
476 |
void set_concurrency(uint active_tasks); |
70f98431dd29
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
16388
diff
changeset
|
477 |
|
1374 | 478 |
// It should be called to indicate which phase we're in (concurrent |
479 |
// mark or remark) and how many threads are currently active. |
|
16389
70f98431dd29
8009940: G1: assert(_finger == _heap_end) failed, concurrentMark.cpp:809
johnc
parents:
16388
diff
changeset
|
480 |
void set_concurrency_and_phase(uint active_tasks, bool concurrent); |
1374 | 481 |
|
22551 | 482 |
// Prints all gathered CM-related statistics |
1374 | 483 |
void print_stats(); |
484 |
||
7923 | 485 |
bool cleanup_list_is_empty() { |
486 |
return _cleanup_list.is_empty(); |
|
487 |
} |
|
488 |
||
22551 | 489 |
// Accessor methods |
15489
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
490 |
uint parallel_marking_threads() const { return _parallel_marking_threads; } |
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
491 |
uint max_parallel_marking_threads() const { return _max_parallel_marking_threads;} |
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
492 |
double sleep_factor() { return _sleep_factor; } |
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
493 |
double marking_task_overhead() { return _marking_task_overhead;} |
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
494 |
double cleanup_sleep_factor() { return _cleanup_sleep_factor; } |
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
495 |
double cleanup_task_overhead() { return _cleanup_task_overhead;} |
1374 | 496 |
|
15489
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
497 |
HeapWord* finger() { return _finger; } |
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
498 |
bool concurrent() { return _concurrent; } |
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
499 |
uint active_tasks() { return _active_tasks; } |
0f2bd608c4f2
8005875: G1: Kitchensink fails with ParallelGCThreads=0
johnc
parents:
15090
diff
changeset
|
500 |
ParallelTaskTerminator* terminator() { return &_terminator; } |
1374 | 501 |
|
502 |
// It claims the next available region to be scanned by a marking |
|
14073
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
13919
diff
changeset
|
503 |
// task/thread. It might return NULL if the next region is empty or |
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
13919
diff
changeset
|
504 |
// we have run out of regions. In the latter case, out_of_regions() |
1374 | 505 |
// determines whether we've really run out of regions or the task |
14073
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
13919
diff
changeset
|
506 |
// should call claim_region() again. This might seem a bit |
1374 | 507 |
// awkward. Originally, the code was written so that claim_region() |
508 |
// either successfully returned with a non-empty region or there |
|
509 |
// were no more regions to be claimed. The problem with this was |
|
510 |
// that, in certain circumstances, it iterated over large chunks of |
|
511 |
// the heap finding only empty regions and, while it was working, it |
|
512 |
// was preventing the calling task to call its regular clock |
|
513 |
// method. So, this way, each task will spend very little time in |
|
514 |
// claim_region() and is allowed to call the regular clock method |
|
515 |
// frequently. |
|
14073
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
13919
diff
changeset
|
516 |
HeapRegion* claim_region(uint worker_id); |
1374 | 517 |
|
24469
33e039f8ee55
8040804: G1: Concurrent mark stuck in loop calling os::elapsedVTime()
pliden
parents:
24094
diff
changeset
|
518 |
// It determines whether we've run out of regions to scan. Note that |
33e039f8ee55
8040804: G1: Concurrent mark stuck in loop calling os::elapsedVTime()
pliden
parents:
24094
diff
changeset
|
519 |
// the finger can point past the heap end in case the heap was expanded |
33e039f8ee55
8040804: G1: Concurrent mark stuck in loop calling os::elapsedVTime()
pliden
parents:
24094
diff
changeset
|
520 |
// to satisfy an allocation without doing a GC. This is fine, because all |
33e039f8ee55
8040804: G1: Concurrent mark stuck in loop calling os::elapsedVTime()
pliden
parents:
24094
diff
changeset
|
521 |
// objects in those regions will be considered live anyway because of |
33e039f8ee55
8040804: G1: Concurrent mark stuck in loop calling os::elapsedVTime()
pliden
parents:
24094
diff
changeset
|
522 |
// SATB guarantees (i.e. their TAMS will be equal to bottom). |
33e039f8ee55
8040804: G1: Concurrent mark stuck in loop calling os::elapsedVTime()
pliden
parents:
24094
diff
changeset
|
523 |
bool out_of_regions() { return _finger >= _heap_end; } |
1374 | 524 |
|
525 |
// Returns the task with the given id |
|
526 |
CMTask* task(int id) { |
|
4026
10386ea70fe5
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
4022
diff
changeset
|
527 |
assert(0 <= id && id < (int) _active_tasks, |
10386ea70fe5
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
4022
diff
changeset
|
528 |
"task id not within active bounds"); |
1374 | 529 |
return _tasks[id]; |
530 |
} |
|
531 |
||
532 |
// Returns the task queue with the given id |
|
533 |
CMTaskQueue* task_queue(int id) { |
|
4026
10386ea70fe5
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
4022
diff
changeset
|
534 |
assert(0 <= id && id < (int) _active_tasks, |
10386ea70fe5
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
4022
diff
changeset
|
535 |
"task queue id not within active bounds"); |
1374 | 536 |
return (CMTaskQueue*) _task_queues->queue(id); |
537 |
} |
|
538 |
||
539 |
// Returns the task queue set |
|
540 |
CMTaskQueueSet* task_queues() { return _task_queues; } |
|
541 |
||
542 |
// Access / manipulation of the overflow flag which is set to |
|
12272
f87fd1292095
7127697: G1: remove dead code after recent concurrent mark changes
tonyp
parents:
11584
diff
changeset
|
543 |
// indicate that the global stack has overflown |
1374 | 544 |
bool has_overflown() { return _has_overflown; } |
545 |
void set_has_overflown() { _has_overflown = true; } |
|
546 |
void clear_has_overflown() { _has_overflown = false; } |
|
11584
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
547 |
bool restart_for_overflow() { return _restart_for_overflow; } |
1374 | 548 |
|
549 |
// Methods to enter the two overflow sync barriers |
|
14073
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
13919
diff
changeset
|
550 |
void enter_first_sync_barrier(uint worker_id); |
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
13919
diff
changeset
|
551 |
void enter_second_sync_barrier(uint worker_id); |
1374 | 552 |
|
9417
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
553 |
ForceOverflowSettings* force_overflow_conc() { |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
554 |
return &_force_overflow_conc; |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
555 |
} |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
556 |
|
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
557 |
ForceOverflowSettings* force_overflow_stw() { |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
558 |
return &_force_overflow_stw; |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
559 |
} |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
560 |
|
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
561 |
ForceOverflowSettings* force_overflow() { |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
562 |
if (concurrent()) { |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
563 |
return force_overflow_conc(); |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
564 |
} else { |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
565 |
return force_overflow_stw(); |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
566 |
} |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
567 |
} |
6719a2e727c0
7034139: G1: assert(Thread::current()->is_ConcurrentGC_thread()) failed: only a conc GC thread can call this.
tonyp
parents:
8930
diff
changeset
|
568 |
|
11583
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
569 |
// Live Data Counting data structures... |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
570 |
// These data structures are initialized at the start of |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
571 |
// marking. They are written to while marking is active. |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
572 |
// They are aggregated during remark; the aggregated values |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
573 |
// are then used to populate the _region_bm, _card_bm, and |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
574 |
// the total live bytes, which are then subsequently updated |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
575 |
// during cleanup. |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
576 |
|
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
577 |
// An array of bitmaps (one bit map per task). Each bitmap |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
578 |
// is used to record the cards spanned by the live objects |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
579 |
// marked by that task/worker. |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
580 |
BitMap* _count_card_bitmaps; |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
581 |
|
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
582 |
// Used to record the number of marked live bytes |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
583 |
// (for each region, by worker thread). |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
584 |
size_t** _count_marked_bytes; |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
585 |
|
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
586 |
// Card index of the bottom of the G1 heap. Used for biasing indices into |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
587 |
// the card bitmaps. |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
588 |
intptr_t _heap_bottom_card_num; |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
589 |
|
14740
1431ef92fed1
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
14073
diff
changeset
|
590 |
// Set to true when initialization is complete |
1431ef92fed1
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
14073
diff
changeset
|
591 |
bool _completed_initialization; |
1431ef92fed1
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
14073
diff
changeset
|
592 |
|
1374 | 593 |
public: |
594 |
// Manipulation of the global mark stack. |
|
30611
6f7f529bdeed
8079080: ConcurrentMark::mark_stack_push(oop) is unused
kbarrett
parents:
30577
diff
changeset
|
595 |
// The push and pop operations are used by tasks for transfers |
6f7f529bdeed
8079080: ConcurrentMark::mark_stack_push(oop) is unused
kbarrett
parents:
30577
diff
changeset
|
596 |
// between task-local queues and the global mark stack, and use |
6f7f529bdeed
8079080: ConcurrentMark::mark_stack_push(oop) is unused
kbarrett
parents:
30577
diff
changeset
|
597 |
// locking for concurrency safety. |
1374 | 598 |
bool mark_stack_push(oop* arr, int n) { |
599 |
_markStack.par_push_arr(arr, n); |
|
600 |
if (_markStack.overflow()) { |
|
601 |
set_has_overflown(); |
|
602 |
return false; |
|
603 |
} |
|
604 |
return true; |
|
605 |
} |
|
606 |
void mark_stack_pop(oop* arr, int max, int* n) { |
|
607 |
_markStack.par_pop_arr(arr, max, n); |
|
608 |
} |
|
9999
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
609 |
size_t mark_stack_size() { return _markStack.size(); } |
1374 | 610 |
size_t partial_mark_stack_size_target() { return _markStack.maxElems()/3; } |
9999
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
611 |
bool mark_stack_overflow() { return _markStack.overflow(); } |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
612 |
bool mark_stack_empty() { return _markStack.isEmpty(); } |
1374 | 613 |
|
11584
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
614 |
CMRootRegions* root_regions() { return &_root_regions; } |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
615 |
|
1374 | 616 |
bool concurrent_marking_in_progress() { |
617 |
return _concurrent_marking_in_progress; |
|
618 |
} |
|
619 |
void set_concurrent_marking_in_progress() { |
|
620 |
_concurrent_marking_in_progress = true; |
|
621 |
} |
|
622 |
void clear_concurrent_marking_in_progress() { |
|
623 |
_concurrent_marking_in_progress = false; |
|
624 |
} |
|
625 |
||
626 |
void update_accum_task_vtime(int i, double vtime) { |
|
627 |
_accum_task_vtime[i] += vtime; |
|
628 |
} |
|
629 |
||
630 |
double all_task_accum_vtime() { |
|
631 |
double ret = 0.0; |
|
14073
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
13919
diff
changeset
|
632 |
for (uint i = 0; i < _max_worker_id; ++i) |
1374 | 633 |
ret += _accum_task_vtime[i]; |
634 |
return ret; |
|
635 |
} |
|
636 |
||
637 |
// Attempts to steal an object from the task queues of other tasks |
|
30566
18eb9aa972d0
8076177: Remove usage of stack.inline.hpp functions from taskqueue.hpp
stefank
parents:
30279
diff
changeset
|
638 |
bool try_stealing(uint worker_id, int* hash_seed, oop& obj); |
1374 | 639 |
|
26320
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
640 |
ConcurrentMark(G1CollectedHeap* g1h, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
641 |
G1RegionToSpaceMapper* prev_bitmap_storage, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
642 |
G1RegionToSpaceMapper* next_bitmap_storage); |
1374 | 643 |
~ConcurrentMark(); |
11583
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
644 |
|
1374 | 645 |
ConcurrentMarkThread* cmThread() { return _cmThread; } |
646 |
||
647 |
CMBitMapRO* prevMarkBitMap() const { return _prevMarkBitMap; } |
|
648 |
CMBitMap* nextMarkBitMap() const { return _nextMarkBitMap; } |
|
649 |
||
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
10670
diff
changeset
|
650 |
// Returns the number of GC threads to be used in a concurrent |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
10670
diff
changeset
|
651 |
// phase based on the number of GC threads being used in a STW |
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
10670
diff
changeset
|
652 |
// phase. |
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11250
diff
changeset
|
653 |
uint scale_parallel_threads(uint n_par_threads); |
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
10670
diff
changeset
|
654 |
|
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
10670
diff
changeset
|
655 |
// Calculates the number of GC threads to be used in a concurrent phase. |
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11250
diff
changeset
|
656 |
uint calc_parallel_marking_threads(); |
11174
fccee5238e70
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
10670
diff
changeset
|
657 |
|
1374 | 658 |
// The following three are interaction between CM and |
659 |
// G1CollectedHeap |
|
660 |
||
661 |
// This notifies CM that a root during initial-mark needs to be |
|
11584
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
662 |
// grayed. It is MT-safe. word_size is the size of the object in |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
663 |
// words. It is passed explicitly as sometimes we cannot calculate |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
664 |
// it from the given object because it might be in an inconsistent |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
665 |
// state (e.g., in to-space and being copied). So the caller is |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
666 |
// responsible for dealing with this issue (e.g., get the size from |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
667 |
// the from-space image when the to-space image might be |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
668 |
// inconsistent) and always passing the size. hr is the region that |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
669 |
// contains the object and it's passed optionally from callers who |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
670 |
// might already have it (no point in recalculating it). |
26320
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
671 |
inline void grayRoot(oop obj, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
672 |
size_t word_size, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
673 |
uint worker_id, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
674 |
HeapRegion* hr = NULL); |
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
675 |
|
5344 | 676 |
// It iterates over the heap and for each object it comes across it |
677 |
// will dump the contents of its reference fields, as well as |
|
678 |
// liveness information for the object and its referents. The dump |
|
679 |
// will be written to a file with the following name: |
|
9995
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9994
diff
changeset
|
680 |
// G1PrintReachableBaseFile + "." + str. |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9994
diff
changeset
|
681 |
// vo decides whether the prev (vo == UsePrevMarking), the next |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9994
diff
changeset
|
682 |
// (vo == UseNextMarking) marking information, or the mark word |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9994
diff
changeset
|
683 |
// (vo == UseMarkWord) will be used to determine the liveness of |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9994
diff
changeset
|
684 |
// each object / referent. |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9994
diff
changeset
|
685 |
// If all is true, all objects in the heap will be dumped, otherwise |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9994
diff
changeset
|
686 |
// only the live ones. In the dump the following symbols / breviations |
290620c08233
7004681: G1: Extend marking verification to Full GCs
johnc
parents:
9994
diff
changeset
|
687 |
// are used: |
5344 | 688 |
// M : an explicitly live object (its bitmap bit is set) |
689 |
// > : an implicitly live object (over tams) |
|
690 |
// O : an object outside the G1 heap (typically: in the perm gen) |
|
691 |
// NOT : a reference field whose referent is not live |
|
692 |
// AND MARKED : indicates that an object is both explicitly and |
|
693 |
// implicitly live (it should be one or the other, not both) |
|
694 |
void print_reachable(const char* str, |
|
26320
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
695 |
VerifyOption vo, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
696 |
bool all) PRODUCT_RETURN; |
1374 | 697 |
|
698 |
// Clear the next marking bitmap (will be called concurrently). |
|
699 |
void clearNextBitmap(); |
|
700 |
||
26160 | 701 |
// Return whether the next mark bitmap has no marks set. To be used for assertions |
702 |
// only. Will not yield to pause requests. |
|
25728
7f8a76e3baa8
8048085: Aborting marking just before remark results in useless additional clearing of the next mark bitmap
tschatzl
parents:
25492
diff
changeset
|
703 |
bool nextMarkBitmapIsClear(); |
7f8a76e3baa8
8048085: Aborting marking just before remark results in useless additional clearing of the next mark bitmap
tschatzl
parents:
25492
diff
changeset
|
704 |
|
1374 | 705 |
// These two do the work that needs to be done before and after the |
706 |
// initial root checkpoint. Since this checkpoint can be done at two |
|
707 |
// different points (i.e. an explicit pause or piggy-backed on a |
|
708 |
// young collection), then it's nice to be able to easily share the |
|
709 |
// pre/post code. It might be the case that we can put everything in |
|
710 |
// the post method. TP |
|
711 |
void checkpointRootsInitialPre(); |
|
712 |
void checkpointRootsInitialPost(); |
|
713 |
||
11584
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
714 |
// Scan all the root regions and mark everything reachable from |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
715 |
// them. |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
716 |
void scanRootRegions(); |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
717 |
|
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
718 |
// Scan a single root region and mark everything reachable from it. |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
719 |
void scanRootRegion(HeapRegion* hr, uint worker_id); |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
11583
diff
changeset
|
720 |
|
1374 | 721 |
// Do concurrent phase of marking, to a tentative transitive closure. |
722 |
void markFromRoots(); |
|
723 |
||
724 |
void checkpointRootsFinal(bool clear_all_soft_refs); |
|
725 |
void checkpointRootsFinalWork(); |
|
726 |
void cleanup(); |
|
727 |
void completeCleanup(); |
|
728 |
||
729 |
// Mark in the previous bitmap. NB: this is usually read-only, so use |
|
730 |
// this carefully! |
|
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
731 |
inline void markPrev(oop p); |
11583
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
732 |
|
26320
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
733 |
// Clears marks for all objects in the given range, for the prev or |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
734 |
// next bitmaps. NB: the previous bitmap is usually |
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
735 |
// read-only, so use this carefully! |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
736 |
void clearRangePrevBitmap(MemRegion mr); |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
737 |
void clearRangeNextBitmap(MemRegion mr); |
1374 | 738 |
|
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
739 |
// Notify data structures that a GC has started. |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
740 |
void note_start_of_gc() { |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
741 |
_markStack.note_start_of_gc(); |
1374 | 742 |
} |
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
743 |
|
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
744 |
// Notify data structures that a GC is finished. |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
745 |
void note_end_of_gc() { |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
746 |
_markStack.note_end_of_gc(); |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
747 |
} |
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
748 |
|
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
749 |
// Verify that there are no CSet oops on the stacks (taskqueues / |
30279
c3b8486760aa
8078023: verify_no_cset_oops found reclaimed humongous object in SATB buffer
kbarrett
parents:
30182
diff
changeset
|
750 |
// global mark stack) and fingers (global / per-task). |
c3b8486760aa
8078023: verify_no_cset_oops found reclaimed humongous object in SATB buffer
kbarrett
parents:
30182
diff
changeset
|
751 |
// If marking is not in progress, it's a no-op. |
c3b8486760aa
8078023: verify_no_cset_oops found reclaimed humongous object in SATB buffer
kbarrett
parents:
30182
diff
changeset
|
752 |
void verify_no_cset_oops() PRODUCT_RETURN; |
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
753 |
|
1374 | 754 |
bool isPrevMarked(oop p) const { |
755 |
assert(p != NULL && p->is_oop(), "expected an oop"); |
|
756 |
HeapWord* addr = (HeapWord*)p; |
|
757 |
assert(addr >= _prevMarkBitMap->startWord() || |
|
758 |
addr < _prevMarkBitMap->endWord(), "in a region"); |
|
759 |
||
760 |
return _prevMarkBitMap->isMarked(addr); |
|
761 |
} |
|
762 |
||
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11250
diff
changeset
|
763 |
inline bool do_yield_check(uint worker_i = 0); |
1374 | 764 |
|
22551 | 765 |
// Called to abort the marking cycle after a Full GC takes place. |
1374 | 766 |
void abort(); |
767 |
||
24848 | 768 |
bool has_aborted() { return _has_aborted; } |
18025 | 769 |
|
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24848
diff
changeset
|
770 |
const GCId& concurrent_gc_id(); |
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24848
diff
changeset
|
771 |
|
1374 | 772 |
// This prints the global/local fingers. It is used for debugging. |
773 |
NOT_PRODUCT(void print_finger();) |
|
774 |
||
775 |
void print_summary_info(); |
|
776 |
||
4022 | 777 |
void print_worker_threads_on(outputStream* st) const; |
778 |
||
16685
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16389
diff
changeset
|
779 |
void print_on_error(outputStream* st) const; |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16389
diff
changeset
|
780 |
|
1374 | 781 |
// The following indicate whether a given verbose level has been |
782 |
// set. Notice that anything above stats is conditional to |
|
783 |
// _MARKING_VERBOSE_ having been set to 1 |
|
9999
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
784 |
bool verbose_stats() { |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
785 |
return _verbose_level >= stats_verbose; |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
786 |
} |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
787 |
bool verbose_low() { |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
788 |
return _MARKING_VERBOSE_ && _verbose_level >= low_verbose; |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
789 |
} |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
790 |
bool verbose_medium() { |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
791 |
return _MARKING_VERBOSE_ && _verbose_level >= medium_verbose; |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
792 |
} |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
793 |
bool verbose_high() { |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
794 |
return _MARKING_VERBOSE_ && _verbose_level >= high_verbose; |
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
795 |
} |
11583
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
796 |
|
13919
01f6d01a9004
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
13195
diff
changeset
|
797 |
// Liveness counting |
01f6d01a9004
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
13195
diff
changeset
|
798 |
|
01f6d01a9004
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
13195
diff
changeset
|
799 |
// Utility routine to set an exclusive range of cards on the given |
01f6d01a9004
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
13195
diff
changeset
|
800 |
// card liveness bitmap |
01f6d01a9004
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
13195
diff
changeset
|
801 |
inline void set_card_bitmap_range(BitMap* card_bm, |
01f6d01a9004
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
13195
diff
changeset
|
802 |
BitMap::idx_t start_idx, |
01f6d01a9004
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
13195
diff
changeset
|
803 |
BitMap::idx_t end_idx, |
01f6d01a9004
7200261: G1: Liveness counting inconsistencies during marking verification
johnc
parents:
13195
diff
changeset
|
804 |
bool is_par); |
11583
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
805 |
|
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
806 |
// Returns the card number of the bottom of the G1 heap. |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
807 |
// Used in biasing indices into accounting card bitmaps. |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
808 |
intptr_t heap_bottom_card_num() const { |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
11575
diff
changeset
|
809 |
return _heap_bottom_card_num; |
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6484965: G1: piggy-back liveness accounting phase on marking
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|
810 |
} |
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changeset
|
811 |
|
83a7383de44c
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changeset
|
812 |
// Returns the card bitmap for a given task or worker id. |
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|
813 |
BitMap* count_card_bitmap_for(uint worker_id) { |
29580
a67a581cfe11
8073315: Enable gcc -Wtype-limits and fix upcoming issues.
goetz
parents:
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diff
changeset
|
814 |
assert(worker_id < _max_worker_id, "oob"); |
11583
83a7383de44c
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|
815 |
assert(_count_card_bitmaps != NULL, "uninitialized"); |
83a7383de44c
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|
816 |
BitMap* task_card_bm = &_count_card_bitmaps[worker_id]; |
83a7383de44c
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changeset
|
817 |
assert(task_card_bm->size() == _card_bm.size(), "size mismatch"); |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
818 |
return task_card_bm; |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
819 |
} |
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changeset
|
820 |
|
83a7383de44c
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changeset
|
821 |
// Returns the array containing the marked bytes for each region, |
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|
822 |
// for the given worker or task id. |
83a7383de44c
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changeset
|
823 |
size_t* count_marked_bytes_array_for(uint worker_id) { |
29580
a67a581cfe11
8073315: Enable gcc -Wtype-limits and fix upcoming issues.
goetz
parents:
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diff
changeset
|
824 |
assert(worker_id < _max_worker_id, "oob"); |
11583
83a7383de44c
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changeset
|
825 |
assert(_count_marked_bytes != NULL, "uninitialized"); |
83a7383de44c
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changeset
|
826 |
size_t* marked_bytes_array = _count_marked_bytes[worker_id]; |
83a7383de44c
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changeset
|
827 |
assert(marked_bytes_array != NULL, "uninitialized"); |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
828 |
return marked_bytes_array; |
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changeset
|
829 |
} |
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changeset
|
830 |
|
83a7383de44c
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changeset
|
831 |
// Returns the index in the liveness accounting card table bitmap |
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changeset
|
832 |
// for the given address |
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changeset
|
833 |
inline BitMap::idx_t card_bitmap_index_for(HeapWord* addr); |
83a7383de44c
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changeset
|
834 |
|
83a7383de44c
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changeset
|
835 |
// Counts the size of the given memory region in the the given |
83a7383de44c
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changeset
|
836 |
// marked_bytes array slot for the given HeapRegion. |
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|
837 |
// Sets the bits in the given card bitmap that are associated with the |
83a7383de44c
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|
838 |
// cards that are spanned by the memory region. |
26320
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8055919: Remove dead code in G1 concurrent marking code
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parents:
26160
diff
changeset
|
839 |
inline void count_region(MemRegion mr, |
fc0a95c692f5
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changeset
|
840 |
HeapRegion* hr, |
11583
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|
841 |
size_t* marked_bytes_array, |
83a7383de44c
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changeset
|
842 |
BitMap* task_card_bm); |
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changeset
|
843 |
|
83a7383de44c
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changeset
|
844 |
// Counts the given memory region in the task/worker counting |
83a7383de44c
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changeset
|
845 |
// data structures for the given worker id. |
11584
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
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diff
changeset
|
846 |
inline void count_region(MemRegion mr, HeapRegion* hr, uint worker_id); |
e1df4d08a1f4
7127706: G1: re-enable survivors during the initial-mark pause
tonyp
parents:
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diff
changeset
|
847 |
|
11583
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
848 |
// Counts the given object in the given task/worker counting |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
849 |
// data structures. |
26320
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parents:
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diff
changeset
|
850 |
inline void count_object(oop obj, |
fc0a95c692f5
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changeset
|
851 |
HeapRegion* hr, |
11583
83a7383de44c
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changeset
|
852 |
size_t* marked_bytes_array, |
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changeset
|
853 |
BitMap* task_card_bm); |
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changeset
|
854 |
|
83a7383de44c
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changeset
|
855 |
// Attempts to mark the given object and, if successful, counts |
83a7383de44c
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changeset
|
856 |
// the object in the given task/worker counting structures. |
26320
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parents:
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diff
changeset
|
857 |
inline bool par_mark_and_count(oop obj, |
fc0a95c692f5
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parents:
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diff
changeset
|
858 |
HeapRegion* hr, |
11583
83a7383de44c
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changeset
|
859 |
size_t* marked_bytes_array, |
83a7383de44c
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changeset
|
860 |
BitMap* task_card_bm); |
83a7383de44c
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diff
changeset
|
861 |
|
83a7383de44c
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changeset
|
862 |
// Attempts to mark the given object and, if successful, counts |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
863 |
// the object in the task/worker counting structures for the |
83a7383de44c
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changeset
|
864 |
// given worker id. |
26320
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parents:
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diff
changeset
|
865 |
inline bool par_mark_and_count(oop obj, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
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diff
changeset
|
866 |
size_t word_size, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
867 |
HeapRegion* hr, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
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diff
changeset
|
868 |
uint worker_id); |
11583
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
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diff
changeset
|
869 |
|
14740
1431ef92fed1
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
14073
diff
changeset
|
870 |
// Returns true if initialization was successfully completed. |
1431ef92fed1
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
871 |
bool completed_initialization() const { |
1431ef92fed1
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
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diff
changeset
|
872 |
return _completed_initialization; |
1431ef92fed1
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
14073
diff
changeset
|
873 |
} |
1431ef92fed1
8000244: G1: Ergonomically set MarkStackSize and use virtual space for global marking stack
johnc
parents:
14073
diff
changeset
|
874 |
|
11583
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diff
changeset
|
875 |
protected: |
83a7383de44c
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diff
changeset
|
876 |
// Clear all the per-task bitmaps and arrays used to store the |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
parents:
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diff
changeset
|
877 |
// counting data. |
83a7383de44c
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diff
changeset
|
878 |
void clear_all_count_data(); |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
johnc
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diff
changeset
|
879 |
|
83a7383de44c
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diff
changeset
|
880 |
// Aggregates the counting data for each worker/task |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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parents:
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changeset
|
881 |
// that was constructed while marking. Also sets |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
882 |
// the amount of marked bytes for each region and |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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changeset
|
883 |
// the top at concurrent mark count. |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
884 |
void aggregate_count_data(); |
83a7383de44c
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diff
changeset
|
885 |
|
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
886 |
// Verification routine |
83a7383de44c
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changeset
|
887 |
void verify_count_data(); |
1374 | 888 |
}; |
889 |
||
890 |
// A class representing a marking task. |
|
891 |
class CMTask : public TerminatorTerminator { |
|
892 |
private: |
|
893 |
enum PrivateConstants { |
|
894 |
// the regular clock call is called once the scanned words reaches |
|
895 |
// this limit |
|
896 |
words_scanned_period = 12*1024, |
|
897 |
// the regular clock call is called once the number of visited |
|
898 |
// references reaches this limit |
|
899 |
refs_reached_period = 384, |
|
900 |
// initial value for the hash seed, used in the work stealing code |
|
901 |
init_hash_seed = 17, |
|
902 |
// how many entries will be transferred between global stack and |
|
903 |
// local queues |
|
904 |
global_stack_transfer_size = 16 |
|
905 |
}; |
|
906 |
||
14073
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
johnc
parents:
13919
diff
changeset
|
907 |
uint _worker_id; |
1374 | 908 |
G1CollectedHeap* _g1h; |
909 |
ConcurrentMark* _cm; |
|
910 |
CMBitMap* _nextMarkBitMap; |
|
911 |
// the task queue of this task |
|
912 |
CMTaskQueue* _task_queue; |
|
3262
30d1c247fc25
6700789: G1: Enable use of compressed oops with G1 heaps
ysr
parents:
2105
diff
changeset
|
913 |
private: |
1374 | 914 |
// the task queue set---needed for stealing |
915 |
CMTaskQueueSet* _task_queues; |
|
916 |
// indicates whether the task has been claimed---this is only for |
|
917 |
// debugging purposes |
|
918 |
bool _claimed; |
|
919 |
||
920 |
// number of calls to this task |
|
921 |
int _calls; |
|
922 |
||
923 |
// when the virtual timer reaches this time, the marking step should |
|
924 |
// exit |
|
925 |
double _time_target_ms; |
|
926 |
// the start time of the current marking step |
|
927 |
double _start_time_ms; |
|
928 |
||
929 |
// the oop closure used for iterations over oops |
|
9994 | 930 |
G1CMOopClosure* _cm_oop_closure; |
1374 | 931 |
|
932 |
// the region this task is scanning, NULL if we're not scanning any |
|
933 |
HeapRegion* _curr_region; |
|
934 |
// the local finger of this task, NULL if we're not scanning a region |
|
935 |
HeapWord* _finger; |
|
936 |
// limit of the region this task is scanning, NULL if we're not scanning one |
|
937 |
HeapWord* _region_limit; |
|
938 |
||
939 |
// the number of words this task has scanned |
|
940 |
size_t _words_scanned; |
|
941 |
// When _words_scanned reaches this limit, the regular clock is |
|
942 |
// called. Notice that this might be decreased under certain |
|
943 |
// circumstances (i.e. when we believe that we did an expensive |
|
944 |
// operation). |
|
945 |
size_t _words_scanned_limit; |
|
946 |
// the initial value of _words_scanned_limit (i.e. what it was |
|
947 |
// before it was decreased). |
|
948 |
size_t _real_words_scanned_limit; |
|
949 |
||
950 |
// the number of references this task has visited |
|
951 |
size_t _refs_reached; |
|
952 |
// When _refs_reached reaches this limit, the regular clock is |
|
953 |
// called. Notice this this might be decreased under certain |
|
954 |
// circumstances (i.e. when we believe that we did an expensive |
|
955 |
// operation). |
|
956 |
size_t _refs_reached_limit; |
|
957 |
// the initial value of _refs_reached_limit (i.e. what it was before |
|
958 |
// it was decreased). |
|
959 |
size_t _real_refs_reached_limit; |
|
960 |
||
961 |
// used by the work stealing stuff |
|
962 |
int _hash_seed; |
|
963 |
// if this is true, then the task has aborted for some reason |
|
964 |
bool _has_aborted; |
|
965 |
// set when the task aborts because it has met its time quota |
|
8073
a14dc27842dc
6608385: G1: need to support parallel reference processing
johnc
parents:
7923
diff
changeset
|
966 |
bool _has_timed_out; |
1374 | 967 |
// true when we're draining SATB buffers; this avoids the task |
968 |
// aborting due to SATB buffers being available (as we're already |
|
969 |
// dealing with them) |
|
970 |
bool _draining_satb_buffers; |
|
971 |
||
972 |
// number sequence of past step times |
|
973 |
NumberSeq _step_times_ms; |
|
974 |
// elapsed time of this task |
|
975 |
double _elapsed_time_ms; |
|
976 |
// termination time of this task |
|
977 |
double _termination_time_ms; |
|
978 |
// when this task got into the termination protocol |
|
979 |
double _termination_start_time_ms; |
|
980 |
||
981 |
// true when the task is during a concurrent phase, false when it is |
|
982 |
// in the remark phase (so, in the latter case, we do not have to |
|
983 |
// check all the things that we have to check during the concurrent |
|
984 |
// phase, i.e. SATB buffer availability...) |
|
985 |
bool _concurrent; |
|
986 |
||
987 |
TruncatedSeq _marking_step_diffs_ms; |
|
988 |
||
11583
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changeset
|
989 |
// Counting data structures. Embedding the task's marked_bytes_array |
83a7383de44c
6484965: G1: piggy-back liveness accounting phase on marking
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diff
changeset
|
990 |
// and card bitmap into the actual task saves having to go through |
83a7383de44c
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diff
changeset
|
991 |
// the ConcurrentMark object. |
83a7383de44c
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diff
changeset
|
992 |
size_t* _marked_bytes_array; |
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changeset
|
993 |
BitMap* _card_bm; |
83a7383de44c
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changeset
|
994 |
|
1374 | 995 |
// LOTS of statistics related with this task |
996 |
#if _MARKING_STATS_ |
|
997 |
NumberSeq _all_clock_intervals_ms; |
|
998 |
double _interval_start_time_ms; |
|
999 |
||
29472 | 1000 |
size_t _aborted; |
1001 |
size_t _aborted_overflow; |
|
1002 |
size_t _aborted_cm_aborted; |
|
1003 |
size_t _aborted_yield; |
|
1004 |
size_t _aborted_timed_out; |
|
1005 |
size_t _aborted_satb; |
|
1006 |
size_t _aborted_termination; |
|
1374 | 1007 |
|
29472 | 1008 |
size_t _steal_attempts; |
1009 |
size_t _steals; |
|
1374 | 1010 |
|
29472 | 1011 |
size_t _clock_due_to_marking; |
1012 |
size_t _clock_due_to_scanning; |
|
1374 | 1013 |
|
29472 | 1014 |
size_t _local_pushes; |
1015 |
size_t _local_pops; |
|
1016 |
size_t _local_max_size; |
|
1017 |
size_t _objs_scanned; |
|
1374 | 1018 |
|
29472 | 1019 |
size_t _global_pushes; |
1020 |
size_t _global_pops; |
|
1021 |
size_t _global_max_size; |
|
1374 | 1022 |
|
29472 | 1023 |
size_t _global_transfers_to; |
1024 |
size_t _global_transfers_from; |
|
1374 | 1025 |
|
29472 | 1026 |
size_t _regions_claimed; |
1027 |
size_t _objs_found_on_bitmap; |
|
1374 | 1028 |
|
29472 | 1029 |
size_t _satb_buffers_processed; |
1374 | 1030 |
#endif // _MARKING_STATS_ |
1031 |
||
1032 |
// it updates the local fields after this task has claimed |
|
1033 |
// a new region to scan |
|
1034 |
void setup_for_region(HeapRegion* hr); |
|
1035 |
// it brings up-to-date the limit of the region |
|
1036 |
void update_region_limit(); |
|
1037 |
||
1038 |
// called when either the words scanned or the refs visited limit |
|
1039 |
// has been reached |
|
1040 |
void reached_limit(); |
|
1041 |
// recalculates the words scanned and refs visited limits |
|
1042 |
void recalculate_limits(); |
|
1043 |
// decreases the words scanned and refs visited limits when we reach |
|
1044 |
// an expensive operation |
|
1045 |
void decrease_limits(); |
|
1046 |
// it checks whether the words scanned or refs visited reached their |
|
1047 |
// respective limit and calls reached_limit() if they have |
|
1048 |
void check_limits() { |
|
1049 |
if (_words_scanned >= _words_scanned_limit || |
|
9999
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
1050 |
_refs_reached >= _refs_reached_limit) { |
1374 | 1051 |
reached_limit(); |
9999
5f0b78217054
7055073: G1: code cleanup in the concurrentMark.* files
tonyp
parents:
9995
diff
changeset
|
1052 |
} |
1374 | 1053 |
} |
1054 |
// this is supposed to be called regularly during a marking step as |
|
1055 |
// it checks a bunch of conditions that might cause the marking step |
|
1056 |
// to abort |
|
1057 |
void regular_clock_call(); |
|
1058 |
bool concurrent() { return _concurrent; } |
|
1059 |
||
30577
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changeset
|
1060 |
// Test whether obj might have already been passed over by the |
30162 | 1061 |
// mark bitmap scan, and so needs to be pushed onto the mark stack. |
30577
de9fa7ccc1bc
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parents:
30568
diff
changeset
|
1062 |
bool is_below_finger(oop obj, HeapWord* global_finger) const; |
30162 | 1063 |
|
30182
1c980a880941
8069367: Eagerly reclaimed humongous objects left on mark stack
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diff
changeset
|
1064 |
template<bool scan> void process_grey_object(oop obj); |
1c980a880941
8069367: Eagerly reclaimed humongous objects left on mark stack
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diff
changeset
|
1065 |
|
1374 | 1066 |
public: |
1067 |
// It resets the task; it should be called right at the beginning of |
|
1068 |
// a marking phase. |
|
1069 |
void reset(CMBitMap* _nextMarkBitMap); |
|
1070 |
// it clears all the fields that correspond to a claimed region. |
|
1071 |
void clear_region_fields(); |
|
1072 |
||
1073 |
void set_concurrent(bool concurrent) { _concurrent = concurrent; } |
|
1074 |
||
1075 |
// The main method of this class which performs a marking step |
|
1076 |
// trying not to exceed the given duration. However, it might exit |
|
1077 |
// prematurely, according to some conditions (i.e. SATB buffers are |
|
1078 |
// available for processing). |
|
16388
60de0264afe8
8009536: G1: Apache Lucene hang during reference processing
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diff
changeset
|
1079 |
void do_marking_step(double target_ms, |
60de0264afe8
8009536: G1: Apache Lucene hang during reference processing
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parents:
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diff
changeset
|
1080 |
bool do_termination, |
60de0264afe8
8009536: G1: Apache Lucene hang during reference processing
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parents:
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diff
changeset
|
1081 |
bool is_serial); |
1374 | 1082 |
|
1083 |
// These two calls start and stop the timer |
|
1084 |
void record_start_time() { |
|
1085 |
_elapsed_time_ms = os::elapsedTime() * 1000.0; |
|
1086 |
} |
|
1087 |
void record_end_time() { |
|
1088 |
_elapsed_time_ms = os::elapsedTime() * 1000.0 - _elapsed_time_ms; |
|
1089 |
} |
|
1090 |
||
14073
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
13919
diff
changeset
|
1091 |
// returns the worker ID associated with this task. |
6012178c0c19
7127708: G1: change task num types from int to uint in concurrent mark
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parents:
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diff
changeset
|
1092 |
uint worker_id() { return _worker_id; } |
1374 | 1093 |
|
1094 |
// From TerminatorTerminator. It determines whether this task should |
|
1095 |
// exit the termination protocol after it's entered it. |
|
1096 |
virtual bool should_exit_termination(); |
|
1097 |
||
9936
59dac2950cc7
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
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diff
changeset
|
1098 |
// Resets the local region fields after a task has finished scanning a |
59dac2950cc7
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
9417
diff
changeset
|
1099 |
// region; or when they have become stale as a result of the region |
59dac2950cc7
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
9417
diff
changeset
|
1100 |
// being evacuated. |
59dac2950cc7
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
9417
diff
changeset
|
1101 |
void giveup_current_region(); |
59dac2950cc7
7041440: G1: assert(obj->is_oop_or_null(true )) failed: Error #
johnc
parents:
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diff
changeset
|
1102 |
|
1374 | 1103 |
HeapWord* finger() { return _finger; } |
1104 |
||
1105 |
bool has_aborted() { return _has_aborted; } |
|
1106 |
void set_has_aborted() { _has_aborted = true; } |
|
1107 |
void clear_has_aborted() { _has_aborted = false; } |
|
8073
a14dc27842dc
6608385: G1: need to support parallel reference processing
johnc
parents:
7923
diff
changeset
|
1108 |
bool has_timed_out() { return _has_timed_out; } |
a14dc27842dc
6608385: G1: need to support parallel reference processing
johnc
parents:
7923
diff
changeset
|
1109 |
bool claimed() { return _claimed; } |
1374 | 1110 |
|
9994 | 1111 |
void set_cm_oop_closure(G1CMOopClosure* cm_oop_closure); |
1374 | 1112 |
|
30577
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8075215: SATB buffer processing found reclaimed humongous object
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parents:
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diff
changeset
|
1113 |
// Increment the number of references this task has visited. |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1114 |
void increment_refs_reached() { ++_refs_reached; } |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1115 |
|
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1116 |
// Grey the object by marking it. If not already marked, push it on |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1117 |
// the local queue if below the finger. |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1118 |
// Precondition: obj is in region. |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1119 |
// Precondition: obj is below region's NTAMS. |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1120 |
inline void make_reference_grey(oop obj, HeapRegion* region); |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1121 |
|
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1122 |
// Grey the object (by calling make_grey_reference) if required, |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1123 |
// e.g. obj is below its containing region's NTAMS. |
de9fa7ccc1bc
8075215: SATB buffer processing found reclaimed humongous object
kbarrett
parents:
30568
diff
changeset
|
1124 |
// Precondition: obj is a valid heap object. |
9994 | 1125 |
inline void deal_with_reference(oop obj); |
1374 | 1126 |
|
1127 |
// It scans an object and visits its children. |
|
30182
1c980a880941
8069367: Eagerly reclaimed humongous objects left on mark stack
kbarrett
parents:
30162
diff
changeset
|
1128 |
void scan_object(oop obj) { process_grey_object<true>(obj); } |
1374 | 1129 |
|
1130 |
// It pushes an object on the local queue. |
|
9994 | 1131 |
inline void push(oop obj); |
1374 | 1132 |
|
1133 |
// These two move entries to/from the global stack. |
|
1134 |
void move_entries_to_global_stack(); |
|
1135 |
void get_entries_from_global_stack(); |
|
1136 |
||
1137 |
// It pops and scans objects from the local queue. If partially is |
|
1138 |
// true, then it stops when the queue size is of a given limit. If |
|
1139 |
// partially is false, then it stops when the queue is empty. |
|
1140 |
void drain_local_queue(bool partially); |
|
1141 |
// It moves entries from the global stack to the local queue and |
|
1142 |
// drains the local queue. If partially is true, then it stops when |
|
1143 |
// both the global stack and the local queue reach a given size. If |
|
1144 |
// partially if false, it tries to empty them totally. |
|
1145 |
void drain_global_stack(bool partially); |
|
1146 |
// It keeps picking SATB buffers and processing them until no SATB |
|
1147 |
// buffers are available. |
|
1148 |
void drain_satb_buffers(); |
|
11455
a6ab3d8b9a4c
6888336: G1: avoid explicitly marking and pushing objects in survivor spaces
tonyp
parents:
11396
diff
changeset
|
1149 |
|
1374 | 1150 |
// moves the local finger to a new location |
1151 |
inline void move_finger_to(HeapWord* new_finger) { |
|
4026
10386ea70fe5
6888619: G1: too many guarantees in concurrent marking
tonyp
parents:
4022
diff
changeset
|
1152 |
assert(new_finger >= _finger && new_finger < _region_limit, "invariant"); |
1374 | 1153 |
_finger = new_finger; |
1154 |
} |
|
1155 |
||
26320
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
1156 |
CMTask(uint worker_id, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
1157 |
ConcurrentMark *cm, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
1158 |
size_t* marked_bytes, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
1159 |
BitMap* card_bm, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
1160 |
CMTaskQueue* task_queue, |
fc0a95c692f5
8055919: Remove dead code in G1 concurrent marking code
tschatzl
parents:
26160
diff
changeset
|
1161 |
CMTaskQueueSet* task_queues); |
1374 | 1162 |
|
1163 |
// it prints statistics associated with this task |
|
1164 |
void print_stats(); |
|
1165 |
||
1166 |
#if _MARKING_STATS_ |
|
1167 |
void increase_objs_found_on_bitmap() { ++_objs_found_on_bitmap; } |
|
1168 |
#endif // _MARKING_STATS_ |
|
1169 |
}; |
|
7397 | 1170 |
|
8930
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1171 |
// Class that's used to to print out per-region liveness |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1172 |
// information. It's currently used at the end of marking and also |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1173 |
// after we sort the old regions at the end of the cleanup operation. |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1174 |
class G1PrintRegionLivenessInfoClosure: public HeapRegionClosure { |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1175 |
private: |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1176 |
outputStream* _out; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1177 |
|
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1178 |
// Accumulators for these values. |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1179 |
size_t _total_used_bytes; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1180 |
size_t _total_capacity_bytes; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1181 |
size_t _total_prev_live_bytes; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1182 |
size_t _total_next_live_bytes; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1183 |
|
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1184 |
// These are set up when we come across a "stars humongous" region |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1185 |
// (as this is where most of this information is stored, not in the |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1186 |
// subsequent "continues humongous" regions). After that, for every |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1187 |
// region in a given humongous region series we deduce the right |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1188 |
// values for it by simply subtracting the appropriate amount from |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1189 |
// these fields. All these values should reach 0 after we've visited |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1190 |
// the last region in the series. |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1191 |
size_t _hum_used_bytes; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1192 |
size_t _hum_capacity_bytes; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1193 |
size_t _hum_prev_live_bytes; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1194 |
size_t _hum_next_live_bytes; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1195 |
|
17395
2cd3ef1be718
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
16685
diff
changeset
|
1196 |
// Accumulator for the remembered set size |
2cd3ef1be718
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
16685
diff
changeset
|
1197 |
size_t _total_remset_bytes; |
2cd3ef1be718
8014240: G1: Add remembered set size information to output of G1PrintRegionLivenessInfo
tschatzl
parents:
16685
diff
changeset
|
1198 |
|
19339 | 1199 |
// Accumulator for strong code roots memory size |
1200 |
size_t _total_strong_code_roots_bytes; |
|
1201 |
||
8930
52368505ee8e
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8073
diff
changeset
|
1202 |
static double perc(size_t val, size_t total) { |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1203 |
if (total == 0) { |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1204 |
return 0.0; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1205 |
} else { |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1206 |
return 100.0 * ((double) val / (double) total); |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1207 |
} |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1208 |
} |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1209 |
|
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1210 |
static double bytes_to_mb(size_t val) { |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1211 |
return (double) val / (double) M; |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1212 |
} |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1213 |
|
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1214 |
// See the .cpp file. |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1215 |
size_t get_hum_bytes(size_t* hum_bytes); |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1216 |
void get_hum_bytes(size_t* used_bytes, size_t* capacity_bytes, |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1217 |
size_t* prev_live_bytes, size_t* next_live_bytes); |
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1218 |
|
52368505ee8e
7027766: G1: introduce flag to dump the liveness information per region at the end of marking
tonyp
parents:
8073
diff
changeset
|
1219 |
public: |
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// The header and footer are printed in the constructor and |
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// destructor respectively. |
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G1PrintRegionLivenessInfoClosure(outputStream* out, const char* phase_name); |
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virtual bool doHeapRegion(HeapRegion* r); |
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~G1PrintRegionLivenessInfoClosure(); |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTMARK_HPP |