author | stefank |
Mon, 25 Nov 2019 12:33:15 +0100 | |
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/* |
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* Copyright (c) 2001, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#ifndef SHARE_GC_G1_HEAPREGIONREMSET_HPP |
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#define SHARE_GC_G1_HEAPREGIONREMSET_HPP |
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#include "gc/g1/g1CodeCacheRemSet.hpp" |
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#include "gc/g1/g1FromCardCache.hpp" |
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#include "gc/g1/sparsePRT.hpp" |
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#include "utilities/bitMap.hpp" |
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// Remembered set for a heap region. Represent a set of "cards" that |
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// contain pointers into the owner heap region. Cards are defined somewhat |
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// abstractly, in terms of what the "BlockOffsetTable" in use can parse. |
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class G1CollectedHeap; |
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class G1BlockOffsetTable; |
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class G1CardLiveData; |
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class HeapRegion; |
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class PerRegionTable; |
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class SparsePRT; |
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class nmethod; |
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// The "_coarse_map" is a bitmap with one bit for each region, where set |
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// bits indicate that the corresponding region may contain some pointer |
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// into the owning region. |
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// The "_fine_grain_entries" array is an open hash table of PerRegionTables |
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// (PRTs), indicating regions for which we're keeping the RS as a set of |
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// cards. The strategy is to cap the size of the fine-grain table, |
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// deleting an entry and setting the corresponding coarse-grained bit when |
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// we would overflow this cap. |
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// We use a mixture of locking and lock-free techniques here. We allow |
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// threads to locate PRTs without locking, but threads attempting to alter |
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// a bucket list obtain a lock. This means that any failing attempt to |
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// find a PRT must be retried with the lock. It might seem dangerous that |
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// a read can find a PRT that is concurrently deleted. This is all right, |
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// because: |
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// |
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// 1) We only actually free PRT's at safe points (though we reuse them at |
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// other times). |
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// 2) We find PRT's in an attempt to add entries. If a PRT is deleted, |
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// it's _coarse_map bit is set, so the that we were attempting to add |
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// is represented. If a deleted PRT is re-used, a thread adding a bit, |
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// thinking the PRT is for a different region, does no harm. |
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class OtherRegionsTable { |
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G1CollectedHeap* _g1h; |
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Mutex* _m; |
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// These are protected by "_m". |
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CHeapBitMap _coarse_map; |
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size_t _n_coarse_entries; |
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static jint _n_coarsenings; |
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PerRegionTable** _fine_grain_regions; |
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size_t _n_fine_entries; |
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// The fine grain remembered sets are doubly linked together using |
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// their 'next' and 'prev' fields. |
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// This allows fast bulk freeing of all the fine grain remembered |
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// set entries, and fast finding of all of them without iterating |
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// over the _fine_grain_regions table. |
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PerRegionTable * _first_all_fine_prts; |
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PerRegionTable * _last_all_fine_prts; |
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// Used to sample a subset of the fine grain PRTs to determine which |
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// PRT to evict and coarsen. |
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size_t _fine_eviction_start; |
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static size_t _fine_eviction_stride; |
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static size_t _fine_eviction_sample_size; |
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SparsePRT _sparse_table; |
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// These are static after init. |
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static size_t _max_fine_entries; |
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static size_t _mod_max_fine_entries_mask; |
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// Requires "prt" to be the first element of the bucket list appropriate |
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// for "hr". If this list contains an entry for "hr", return it, |
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// otherwise return "NULL". |
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PerRegionTable* find_region_table(size_t ind, HeapRegion* hr) const; |
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// Find, delete, and return a candidate PerRegionTable, if any exists, |
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// adding the deleted region to the coarse bitmap. Requires the caller |
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// to hold _m, and the fine-grain table to be full. |
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PerRegionTable* delete_region_table(); |
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// link/add the given fine grain remembered set into the "all" list |
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void link_to_all(PerRegionTable * prt); |
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// unlink/remove the given fine grain remembered set into the "all" list |
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void unlink_from_all(PerRegionTable * prt); |
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bool contains_reference_locked(OopOrNarrowOopStar from) const; |
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size_t occ_fine() const; |
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size_t occ_coarse() const; |
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size_t occ_sparse() const; |
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public: |
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// Create a new remembered set. The given mutex is used to ensure consistency. |
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OtherRegionsTable(Mutex* m); |
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template <class Closure> |
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void iterate(Closure& v); |
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// Returns the card index of the given within_region pointer relative to the bottom |
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// of the given heap region. |
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static CardIdx_t card_within_region(OopOrNarrowOopStar within_region, HeapRegion* hr); |
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// Adds the reference from "from to this remembered set. |
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void add_reference(OopOrNarrowOopStar from, uint tid); |
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// Returns whether the remembered set contains the given reference. |
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bool contains_reference(OopOrNarrowOopStar from) const; |
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// Returns whether this remembered set (and all sub-sets) have an occupancy |
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// that is less or equal than the given occupancy. |
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bool occupancy_less_or_equal_than(size_t limit) const; |
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// Returns whether this remembered set (and all sub-sets) does not contain any entry. |
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bool is_empty() const; |
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// Returns the number of cards contained in this remembered set. |
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size_t occupied() const; |
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static jint n_coarsenings() { return _n_coarsenings; } |
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// Returns size of the actual remembered set containers in bytes. |
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size_t mem_size() const; |
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// Returns the size of static data in bytes. |
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static size_t static_mem_size(); |
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// Returns the size of the free list content in bytes. |
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static size_t fl_mem_size(); |
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// Clear the entire contents of this remembered set. |
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void clear(); |
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}; |
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class PerRegionTable: public CHeapObj<mtGC> { |
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friend class OtherRegionsTable; |
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HeapRegion* _hr; |
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CHeapBitMap _bm; |
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jint _occupied; |
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// next pointer for free/allocated 'all' list |
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PerRegionTable* _next; |
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// prev pointer for the allocated 'all' list |
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PerRegionTable* _prev; |
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// next pointer in collision list |
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PerRegionTable * _collision_list_next; |
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// Global free list of PRTs |
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static PerRegionTable* volatile _free_list; |
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protected: |
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PerRegionTable(HeapRegion* hr) : |
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_hr(hr), |
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_bm(HeapRegion::CardsPerRegion, mtGC), |
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_occupied(0), |
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_next(NULL), _prev(NULL), |
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_collision_list_next(NULL) |
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{} |
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public: |
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// We need access in order to union things into the base table. |
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BitMap* bm() { return &_bm; } |
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HeapRegion* hr() const { return Atomic::load_acquire(&_hr); } |
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jint occupied() const { |
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// Overkill, but if we ever need it... |
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// guarantee(_occupied == _bm.count_one_bits(), "Check"); |
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return _occupied; |
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} |
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void init(HeapRegion* hr, bool clear_links_to_all_list); |
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inline void add_reference(OopOrNarrowOopStar from); |
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inline void add_card(CardIdx_t from_card_index); |
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// (Destructively) union the bitmap of the current table into the given |
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// bitmap (which is assumed to be of the same size.) |
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void union_bitmap_into(BitMap* bm) { |
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bm->set_union(_bm); |
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} |
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|
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// Mem size in bytes. |
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size_t mem_size() const { |
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return sizeof(PerRegionTable) + _bm.size_in_words() * HeapWordSize; |
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} |
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|
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// Requires "from" to be in "hr()". |
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bool contains_reference(OopOrNarrowOopStar from) const { |
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assert(hr()->is_in_reserved(from), "Precondition."); |
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size_t card_ind = pointer_delta(from, hr()->bottom(), |
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G1CardTable::card_size); |
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return _bm.at(card_ind); |
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} |
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|
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// Bulk-free the PRTs from prt to last, assumes that they are |
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// linked together using their _next field. |
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static void bulk_free(PerRegionTable* prt, PerRegionTable* last) { |
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while (true) { |
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PerRegionTable* fl = _free_list; |
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last->set_next(fl); |
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PerRegionTable* res = Atomic::cmpxchg(&_free_list, fl, prt); |
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if (res == fl) { |
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return; |
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} |
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} |
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ShouldNotReachHere(); |
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} |
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|
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static void free(PerRegionTable* prt) { |
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bulk_free(prt, prt); |
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} |
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|
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// Returns an initialized PerRegionTable instance. |
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static PerRegionTable* alloc(HeapRegion* hr); |
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|
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PerRegionTable* next() const { return _next; } |
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void set_next(PerRegionTable* next) { _next = next; } |
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PerRegionTable* prev() const { return _prev; } |
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void set_prev(PerRegionTable* prev) { _prev = prev; } |
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|
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// Accessor and Modification routines for the pointer for the |
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// singly linked collision list that links the PRTs within the |
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// OtherRegionsTable::_fine_grain_regions hash table. |
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// |
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// It might be useful to also make the collision list doubly linked |
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// to avoid iteration over the collisions list during scrubbing/deletion. |
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// OTOH there might not be many collisions. |
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|
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PerRegionTable* collision_list_next() const { |
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return _collision_list_next; |
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} |
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|
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void set_collision_list_next(PerRegionTable* next) { |
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_collision_list_next = next; |
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} |
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|
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PerRegionTable** collision_list_next_addr() { |
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return &_collision_list_next; |
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} |
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|
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static size_t fl_mem_size() { |
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PerRegionTable* cur = _free_list; |
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size_t res = 0; |
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while (cur != NULL) { |
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res += cur->mem_size(); |
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cur = cur->next(); |
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} |
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return res; |
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} |
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281 |
|
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static void test_fl_mem_size(); |
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283 |
}; |
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284 |
|
13195 | 285 |
class HeapRegionRemSet : public CHeapObj<mtGC> { |
1374 | 286 |
friend class VMStructs; |
287 |
||
288 |
private: |
|
35461 | 289 |
G1BlockOffsetTable* _bot; |
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|
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// A set of code blobs (nmethods) whose code contains pointers into |
19339 | 292 |
// the region that owns this RSet. |
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G1CodeRootSet _code_roots; |
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|
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Mutex _m; |
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|
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OtherRegionsTable _other_regions; |
298 |
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HeapRegion* _hr; |
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300 |
|
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void clear_fcc(); |
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|
1374 | 303 |
public: |
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HeapRegionRemSet(G1BlockOffsetTable* bot, HeapRegion* hr); |
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// Setup sparse and fine-grain tables sizes. |
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static void setup_remset_size(); |
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|
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bool is_empty() const { |
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return (strong_code_roots_list_length() == 0) && _other_regions.is_empty(); |
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} |
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312 |
|
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bool occupancy_less_or_equal_than(size_t occ) const { |
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return (strong_code_roots_list_length() == 0) && _other_regions.occupancy_less_or_equal_than(occ); |
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} |
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|
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// For each PRT in the card (remembered) set call one of the following methods |
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// of the given closure: |
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// |
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// set_full_region_dirty(uint region_idx) - pass the region index for coarse PRTs |
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// set_bitmap_dirty(uint region_idx, BitMap* bitmap) - pass the region index and bitmap for fine PRTs |
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// set_cards_dirty(uint region_idx, elem_t* cards, uint num_cards) - pass region index and cards for sparse PRTs |
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323 |
template <class Closure> |
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inline void iterate_prts(Closure& cl); |
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325 |
|
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size_t occupied() { |
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MutexLocker x(&_m, Mutex::_no_safepoint_check_flag); |
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return occupied_locked(); |
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} |
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330 |
size_t occupied_locked() { |
1374 | 331 |
return _other_regions.occupied(); |
332 |
} |
|
333 |
||
334 |
static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); } |
|
335 |
||
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private: |
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enum RemSetState { |
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338 |
Untracked, |
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339 |
Updating, |
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340 |
Complete |
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}; |
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342 |
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RemSetState _state; |
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344 |
|
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static const char* _state_strings[]; |
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static const char* _short_state_strings[]; |
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public: |
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348 |
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const char* get_state_str() const { return _state_strings[_state]; } |
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const char* get_short_state_str() const { return _short_state_strings[_state]; } |
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351 |
|
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bool is_tracked() { return _state != Untracked; } |
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bool is_updating() { return _state == Updating; } |
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bool is_complete() { return _state == Complete; } |
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355 |
|
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void set_state_empty() { |
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guarantee(SafepointSynchronize::is_at_safepoint() || !is_tracked(), "Should only set to Untracked during safepoint but is %s.", get_state_str()); |
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if (_state == Untracked) { |
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return; |
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} |
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clear_fcc(); |
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_state = Untracked; |
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} |
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364 |
|
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void set_state_updating() { |
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guarantee(SafepointSynchronize::is_at_safepoint() && !is_tracked(), "Should only set to Updating from Untracked during safepoint but is %s", get_state_str()); |
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clear_fcc(); |
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_state = Updating; |
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} |
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370 |
|
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void set_state_complete() { |
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clear_fcc(); |
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_state = Complete; |
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} |
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375 |
|
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void add_reference(OopOrNarrowOopStar from, uint tid) { |
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RemSetState state = _state; |
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if (state == Untracked) { |
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return; |
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} |
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|
381 |
|
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uint cur_idx = _hr->hrm_index(); |
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uintptr_t from_card = uintptr_t(from) >> CardTable::card_shift; |
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384 |
|
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if (G1FromCardCache::contains_or_replace(tid, cur_idx, from_card)) { |
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assert(contains_reference(from), "We just found " PTR_FORMAT " in the FromCardCache", p2i(from)); |
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|
387 |
return; |
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|
388 |
} |
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389 |
|
1374 | 390 |
_other_regions.add_reference(from, tid); |
391 |
} |
|
392 |
||
393 |
// The region is being reclaimed; clear its remset, and any mention of |
|
394 |
// entries for this region in other remsets. |
|
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void clear(bool only_cardset = false); |
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void clear_locked(bool only_cardset = false); |
1374 | 397 |
|
398 |
// The actual # of bytes this hr_remset takes up. |
|
19339 | 399 |
// Note also includes the strong code root set. |
1374 | 400 |
size_t mem_size() { |
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MutexLocker x(&_m, Mutex::_no_safepoint_check_flag); |
1374 | 402 |
return _other_regions.mem_size() |
403 |
// This correction is necessary because the above includes the second |
|
404 |
// part. |
|
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+ (sizeof(HeapRegionRemSet) - sizeof(OtherRegionsTable)) |
19339 | 406 |
+ strong_code_roots_mem_size(); |
1374 | 407 |
} |
408 |
||
409 |
// Returns the memory occupancy of all static data structures associated |
|
410 |
// with remembered sets. |
|
411 |
static size_t static_mem_size() { |
|
26422 | 412 |
return OtherRegionsTable::static_mem_size() + G1CodeRootSet::static_mem_size(); |
1374 | 413 |
} |
414 |
||
415 |
// Returns the memory occupancy of all free_list data structures associated |
|
416 |
// with remembered sets. |
|
417 |
static size_t fl_mem_size() { |
|
26422 | 418 |
return OtherRegionsTable::fl_mem_size(); |
1374 | 419 |
} |
420 |
||
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|
421 |
bool contains_reference(OopOrNarrowOopStar from) const { |
1374 | 422 |
return _other_regions.contains_reference(from); |
423 |
} |
|
19339 | 424 |
|
425 |
// Routines for managing the list of code roots that point into |
|
426 |
// the heap region that owns this RSet. |
|
427 |
void add_strong_code_root(nmethod* nm); |
|
26422 | 428 |
void add_strong_code_root_locked(nmethod* nm); |
19339 | 429 |
void remove_strong_code_root(nmethod* nm); |
430 |
||
431 |
// Applies blk->do_code_blob() to each of the entries in |
|
432 |
// the strong code roots list |
|
433 |
void strong_code_roots_do(CodeBlobClosure* blk) const; |
|
434 |
||
26422 | 435 |
void clean_strong_code_roots(HeapRegion* hr); |
436 |
||
19339 | 437 |
// Returns the number of elements in the strong code roots list |
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size_t strong_code_roots_list_length() const { |
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return _code_roots.length(); |
19339 | 440 |
} |
441 |
||
442 |
// Returns true if the strong code roots contains the given |
|
443 |
// nmethod. |
|
444 |
bool strong_code_roots_list_contains(nmethod* nm) { |
|
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return _code_roots.contains(nm); |
19339 | 446 |
} |
447 |
||
448 |
// Returns the amount of memory, in bytes, currently |
|
449 |
// consumed by the strong code roots. |
|
450 |
size_t strong_code_roots_mem_size(); |
|
451 |
||
28030 | 452 |
static void invalidate_from_card_cache(uint start_idx, size_t num_regions) { |
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|
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G1FromCardCache::invalidate(start_idx, num_regions); |
1374 | 454 |
} |
455 |
||
456 |
#ifndef PRODUCT |
|
457 |
static void print_from_card_cache() { |
|
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|
458 |
G1FromCardCache::print(); |
1374 | 459 |
} |
460 |
||
461 |
static void test(); |
|
462 |
#endif |
|
463 |
}; |
|
464 |
||
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465 |
#endif // SHARE_GC_G1_HEAPREGIONREMSET_HPP |