author | jcoomes |
Tue, 30 Sep 2008 13:15:27 -0700 | |
changeset 1408 | e9c4f37aed49 |
parent 1407 | 9006b01ba3fd |
child 1668 | 8ec481b8f514 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2005-2008 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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* |
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*/ |
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class ParallelScavengeHeap; |
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class PSAdaptiveSizePolicy; |
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class PSYoungGen; |
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class PSOldGen; |
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class PSPermGen; |
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class ParCompactionManager; |
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class ParallelTaskTerminator; |
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class PSParallelCompact; |
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class GCTaskManager; |
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class GCTaskQueue; |
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class PreGCValues; |
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class MoveAndUpdateClosure; |
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class RefProcTaskExecutor; |
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class SpaceInfo |
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{ |
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public: |
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MutableSpace* space() const { return _space; } |
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// Where the free space will start after the collection. Valid only after the |
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// summary phase completes. |
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HeapWord* new_top() const { return _new_top; } |
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// Allows new_top to be set. |
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HeapWord** new_top_addr() { return &_new_top; } |
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// Where the smallest allowable dense prefix ends (used only for perm gen). |
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HeapWord* min_dense_prefix() const { return _min_dense_prefix; } |
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// Where the dense prefix ends, or the compacted region begins. |
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HeapWord* dense_prefix() const { return _dense_prefix; } |
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// The start array for the (generation containing the) space, or NULL if there |
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// is no start array. |
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ObjectStartArray* start_array() const { return _start_array; } |
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void set_space(MutableSpace* s) { _space = s; } |
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void set_new_top(HeapWord* addr) { _new_top = addr; } |
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void set_min_dense_prefix(HeapWord* addr) { _min_dense_prefix = addr; } |
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void set_dense_prefix(HeapWord* addr) { _dense_prefix = addr; } |
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void set_start_array(ObjectStartArray* s) { _start_array = s; } |
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private: |
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MutableSpace* _space; |
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HeapWord* _new_top; |
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HeapWord* _min_dense_prefix; |
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HeapWord* _dense_prefix; |
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ObjectStartArray* _start_array; |
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}; |
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class ParallelCompactData |
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{ |
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public: |
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// Sizes are in HeapWords, unless indicated otherwise. |
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static const size_t Log2RegionSize; |
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static const size_t RegionSize; |
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static const size_t RegionSizeBytes; |
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// Mask for the bits in a size_t to get an offset within a region. |
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static const size_t RegionSizeOffsetMask; |
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// Mask for the bits in a pointer to get an offset within a region. |
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static const size_t RegionAddrOffsetMask; |
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// Mask for the bits in a pointer to get the address of the start of a region. |
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static const size_t RegionAddrMask; |
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class RegionData |
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{ |
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public: |
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// Destination address of the region. |
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HeapWord* destination() const { return _destination; } |
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// The first region containing data destined for this region. |
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size_t source_region() const { return _source_region; } |
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// The object (if any) starting in this region and ending in a different |
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// region that could not be updated during the main (parallel) compaction |
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// phase. This is different from _partial_obj_addr, which is an object that |
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// extends onto a source region. However, the two uses do not overlap in |
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// time, so the same field is used to save space. |
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HeapWord* deferred_obj_addr() const { return _partial_obj_addr; } |
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// The starting address of the partial object extending onto the region. |
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HeapWord* partial_obj_addr() const { return _partial_obj_addr; } |
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// Size of the partial object extending onto the region (words). |
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size_t partial_obj_size() const { return _partial_obj_size; } |
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// Size of live data that lies within this region due to objects that start |
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// in this region (words). This does not include the partial object |
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// extending onto the region (if any), or the part of an object that extends |
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// onto the next region (if any). |
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size_t live_obj_size() const { return _dc_and_los & los_mask; } |
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// Total live data that lies within the region (words). |
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size_t data_size() const { return partial_obj_size() + live_obj_size(); } |
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// The destination_count is the number of other regions to which data from |
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// this region will be copied. At the end of the summary phase, the valid |
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// values of destination_count are |
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// |
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// 0 - data from the region will be compacted completely into itself, or the |
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// region is empty. The region can be claimed and then filled. |
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// 1 - data from the region will be compacted into 1 other region; some |
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// data from the region may also be compacted into the region itself. |
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// 2 - data from the region will be copied to 2 other regions. |
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// |
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// During compaction as regions are emptied, the destination_count is |
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// decremented (atomically) and when it reaches 0, it can be claimed and |
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// then filled. |
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// |
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// A region is claimed for processing by atomically changing the |
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// destination_count to the claimed value (dc_claimed). After a region has |
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// been filled, the destination_count should be set to the completed value |
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// (dc_completed). |
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inline uint destination_count() const; |
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inline uint destination_count_raw() const; |
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// The location of the java heap data that corresponds to this region. |
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inline HeapWord* data_location() const; |
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// The highest address referenced by objects in this region. |
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inline HeapWord* highest_ref() const; |
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// Whether this region is available to be claimed, has been claimed, or has |
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// been completed. |
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// |
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// Minor subtlety: claimed() returns true if the region is marked |
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// completed(), which is desirable since a region must be claimed before it |
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// can be completed. |
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bool available() const { return _dc_and_los < dc_one; } |
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bool claimed() const { return _dc_and_los >= dc_claimed; } |
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bool completed() const { return _dc_and_los >= dc_completed; } |
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// These are not atomic. |
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void set_destination(HeapWord* addr) { _destination = addr; } |
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void set_source_region(size_t region) { _source_region = region; } |
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void set_deferred_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
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void set_partial_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
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void set_partial_obj_size(size_t words) { |
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_partial_obj_size = (region_sz_t) words; |
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} |
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inline void set_destination_count(uint count); |
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inline void set_live_obj_size(size_t words); |
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inline void set_data_location(HeapWord* addr); |
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inline void set_completed(); |
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inline bool claim_unsafe(); |
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// These are atomic. |
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inline void add_live_obj(size_t words); |
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inline void set_highest_ref(HeapWord* addr); |
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inline void decrement_destination_count(); |
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inline bool claim(); |
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private: |
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// The type used to represent object sizes within a region. |
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typedef uint region_sz_t; |
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// Constants for manipulating the _dc_and_los field, which holds both the |
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// destination count and live obj size. The live obj size lives at the |
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// least significant end so no masking is necessary when adding. |
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static const region_sz_t dc_shift; // Shift amount. |
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static const region_sz_t dc_mask; // Mask for destination count. |
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static const region_sz_t dc_one; // 1, shifted appropriately. |
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static const region_sz_t dc_claimed; // Region has been claimed. |
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static const region_sz_t dc_completed; // Region has been completed. |
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static const region_sz_t los_mask; // Mask for live obj size. |
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HeapWord* _destination; |
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size_t _source_region; |
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HeapWord* _partial_obj_addr; |
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region_sz_t _partial_obj_size; |
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region_sz_t volatile _dc_and_los; |
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#ifdef ASSERT |
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// These enable optimizations that are only partially implemented. Use |
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// debug builds to prevent the code fragments from breaking. |
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HeapWord* _data_location; |
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HeapWord* _highest_ref; |
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#endif // #ifdef ASSERT |
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#ifdef ASSERT |
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public: |
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uint _pushed; // 0 until region is pushed onto a worker's stack |
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private: |
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#endif |
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}; |
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public: |
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ParallelCompactData(); |
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bool initialize(MemRegion covered_region); |
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size_t region_count() const { return _region_count; } |
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// Convert region indices to/from RegionData pointers. |
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inline RegionData* region(size_t region_idx) const; |
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inline size_t region(const RegionData* const region_ptr) const; |
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// Returns true if the given address is contained within the region |
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bool region_contains(size_t region_index, HeapWord* addr); |
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void add_obj(HeapWord* addr, size_t len); |
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void add_obj(oop p, size_t len) { add_obj((HeapWord*)p, len); } |
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// Fill in the regions covering [beg, end) so that no data moves; i.e., the |
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// destination of region n is simply the start of region n. The argument beg |
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// must be region-aligned; end need not be. |
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void summarize_dense_prefix(HeapWord* beg, HeapWord* end); |
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bool summarize(HeapWord* target_beg, HeapWord* target_end, |
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HeapWord* source_beg, HeapWord* source_end, |
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HeapWord** target_next, HeapWord** source_next = 0); |
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void clear(); |
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void clear_range(size_t beg_region, size_t end_region); |
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void clear_range(HeapWord* beg, HeapWord* end) { |
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clear_range(addr_to_region_idx(beg), addr_to_region_idx(end)); |
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} |
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// Return the number of words between addr and the start of the region |
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// containing addr. |
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inline size_t region_offset(const HeapWord* addr) const; |
1 | 246 |
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// Convert addresses to/from a region index or region pointer. |
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inline size_t addr_to_region_idx(const HeapWord* addr) const; |
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249 |
inline RegionData* addr_to_region_ptr(const HeapWord* addr) const; |
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250 |
inline HeapWord* region_to_addr(size_t region) const; |
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251 |
inline HeapWord* region_to_addr(size_t region, size_t offset) const; |
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252 |
inline HeapWord* region_to_addr(const RegionData* region) const; |
1 | 253 |
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254 |
inline HeapWord* region_align_down(HeapWord* addr) const; |
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255 |
inline HeapWord* region_align_up(HeapWord* addr) const; |
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256 |
inline bool is_region_aligned(HeapWord* addr) const; |
1 | 257 |
|
258 |
// Return the address one past the end of the partial object. |
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259 |
HeapWord* partial_obj_end(size_t region_idx) const; |
1 | 260 |
|
261 |
// Return the new location of the object p after the |
|
262 |
// the compaction. |
|
263 |
HeapWord* calc_new_pointer(HeapWord* addr); |
|
264 |
||
265 |
HeapWord* calc_new_pointer(oop p) { |
|
266 |
return calc_new_pointer((HeapWord*) p); |
|
267 |
} |
|
268 |
||
269 |
// Return the updated address for the given klass |
|
270 |
klassOop calc_new_klass(klassOop); |
|
271 |
||
272 |
#ifdef ASSERT |
|
273 |
void verify_clear(const PSVirtualSpace* vspace); |
|
274 |
void verify_clear(); |
|
275 |
#endif // #ifdef ASSERT |
|
276 |
||
277 |
private: |
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bool initialize_region_data(size_t region_size); |
1 | 279 |
PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
280 |
||
281 |
private: |
|
282 |
HeapWord* _region_start; |
|
283 |
#ifdef ASSERT |
|
284 |
HeapWord* _region_end; |
|
285 |
#endif // #ifdef ASSERT |
|
286 |
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287 |
PSVirtualSpace* _region_vspace; |
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RegionData* _region_data; |
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289 |
size_t _region_count; |
1 | 290 |
}; |
291 |
||
292 |
inline uint |
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293 |
ParallelCompactData::RegionData::destination_count_raw() const |
1 | 294 |
{ |
295 |
return _dc_and_los & dc_mask; |
|
296 |
} |
|
297 |
||
298 |
inline uint |
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|
299 |
ParallelCompactData::RegionData::destination_count() const |
1 | 300 |
{ |
301 |
return destination_count_raw() >> dc_shift; |
|
302 |
} |
|
303 |
||
304 |
inline void |
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|
305 |
ParallelCompactData::RegionData::set_destination_count(uint count) |
1 | 306 |
{ |
307 |
assert(count <= (dc_completed >> dc_shift), "count too large"); |
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308 |
const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
1 | 309 |
_dc_and_los = (count << dc_shift) | live_sz; |
310 |
} |
|
311 |
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312 |
inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
1 | 313 |
{ |
314 |
assert(words <= los_mask, "would overflow"); |
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315 |
_dc_and_los = destination_count_raw() | (region_sz_t)words; |
1 | 316 |
} |
317 |
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318 |
inline void ParallelCompactData::RegionData::decrement_destination_count() |
1 | 319 |
{ |
320 |
assert(_dc_and_los < dc_claimed, "already claimed"); |
|
321 |
assert(_dc_and_los >= dc_one, "count would go negative"); |
|
322 |
Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); |
|
323 |
} |
|
324 |
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|
325 |
inline HeapWord* ParallelCompactData::RegionData::data_location() const |
1 | 326 |
{ |
327 |
DEBUG_ONLY(return _data_location;) |
|
328 |
NOT_DEBUG(return NULL;) |
|
329 |
} |
|
330 |
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|
331 |
inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
1 | 332 |
{ |
333 |
DEBUG_ONLY(return _highest_ref;) |
|
334 |
NOT_DEBUG(return NULL;) |
|
335 |
} |
|
336 |
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|
337 |
inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
1 | 338 |
{ |
339 |
DEBUG_ONLY(_data_location = addr;) |
|
340 |
} |
|
341 |
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|
342 |
inline void ParallelCompactData::RegionData::set_completed() |
1 | 343 |
{ |
344 |
assert(claimed(), "must be claimed first"); |
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|
345 |
_dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
1 | 346 |
} |
347 |
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348 |
// MT-unsafe claiming of a region. Should only be used during single threaded |
1 | 349 |
// execution. |
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|
350 |
inline bool ParallelCompactData::RegionData::claim_unsafe() |
1 | 351 |
{ |
352 |
if (available()) { |
|
353 |
_dc_and_los |= dc_claimed; |
|
354 |
return true; |
|
355 |
} |
|
356 |
return false; |
|
357 |
} |
|
358 |
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|
359 |
inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
1 | 360 |
{ |
361 |
assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); |
|
362 |
Atomic::add((int) words, (volatile int*) &_dc_and_los); |
|
363 |
} |
|
364 |
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|
365 |
inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
1 | 366 |
{ |
367 |
#ifdef ASSERT |
|
368 |
HeapWord* tmp = _highest_ref; |
|
369 |
while (addr > tmp) { |
|
370 |
tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); |
|
371 |
} |
|
372 |
#endif // #ifdef ASSERT |
|
373 |
} |
|
374 |
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|
375 |
inline bool ParallelCompactData::RegionData::claim() |
1 | 376 |
{ |
377 |
const int los = (int) live_obj_size(); |
|
378 |
const int old = Atomic::cmpxchg(dc_claimed | los, |
|
379 |
(volatile int*) &_dc_and_los, los); |
|
380 |
return old == los; |
|
381 |
} |
|
382 |
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|
383 |
inline ParallelCompactData::RegionData* |
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384 |
ParallelCompactData::region(size_t region_idx) const |
1 | 385 |
{ |
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|
386 |
assert(region_idx <= region_count(), "bad arg"); |
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|
387 |
return _region_data + region_idx; |
1 | 388 |
} |
389 |
||
390 |
inline size_t |
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|
391 |
ParallelCompactData::region(const RegionData* const region_ptr) const |
1 | 392 |
{ |
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|
393 |
assert(region_ptr >= _region_data, "bad arg"); |
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|
394 |
assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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|
395 |
return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
1 | 396 |
} |
397 |
||
398 |
inline size_t |
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|
399 |
ParallelCompactData::region_offset(const HeapWord* addr) const |
1 | 400 |
{ |
401 |
assert(addr >= _region_start, "bad addr"); |
|
402 |
assert(addr <= _region_end, "bad addr"); |
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|
403 |
return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
1 | 404 |
} |
405 |
||
406 |
inline size_t |
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|
407 |
ParallelCompactData::addr_to_region_idx(const HeapWord* addr) const |
1 | 408 |
{ |
409 |
assert(addr >= _region_start, "bad addr"); |
|
410 |
assert(addr <= _region_end, "bad addr"); |
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|
411 |
return pointer_delta(addr, _region_start) >> Log2RegionSize; |
1 | 412 |
} |
413 |
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|
414 |
inline ParallelCompactData::RegionData* |
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|
415 |
ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
1 | 416 |
{ |
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|
417 |
return region(addr_to_region_idx(addr)); |
1 | 418 |
} |
419 |
||
420 |
inline HeapWord* |
|
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|
421 |
ParallelCompactData::region_to_addr(size_t region) const |
1 | 422 |
{ |
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|
423 |
assert(region <= _region_count, "region out of range"); |
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|
424 |
return _region_start + (region << Log2RegionSize); |
1 | 425 |
} |
426 |
||
427 |
inline HeapWord* |
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|
428 |
ParallelCompactData::region_to_addr(const RegionData* region) const |
1 | 429 |
{ |
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|
430 |
return region_to_addr(pointer_delta(region, _region_data, |
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|
431 |
sizeof(RegionData))); |
1 | 432 |
} |
433 |
||
434 |
inline HeapWord* |
|
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|
435 |
ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
1 | 436 |
{ |
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|
437 |
assert(region <= _region_count, "region out of range"); |
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|
438 |
assert(offset < RegionSize, "offset too big"); // This may be too strict. |
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|
439 |
return region_to_addr(region) + offset; |
1 | 440 |
} |
441 |
||
442 |
inline HeapWord* |
|
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|
443 |
ParallelCompactData::region_align_down(HeapWord* addr) const |
1 | 444 |
{ |
445 |
assert(addr >= _region_start, "bad addr"); |
|
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|
446 |
assert(addr < _region_end + RegionSize, "bad addr"); |
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|
447 |
return (HeapWord*)(size_t(addr) & RegionAddrMask); |
1 | 448 |
} |
449 |
||
450 |
inline HeapWord* |
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|
451 |
ParallelCompactData::region_align_up(HeapWord* addr) const |
1 | 452 |
{ |
453 |
assert(addr >= _region_start, "bad addr"); |
|
454 |
assert(addr <= _region_end, "bad addr"); |
|
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|
455 |
return region_align_down(addr + RegionSizeOffsetMask); |
1 | 456 |
} |
457 |
||
458 |
inline bool |
|
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|
459 |
ParallelCompactData::is_region_aligned(HeapWord* addr) const |
1 | 460 |
{ |
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|
461 |
return region_offset(addr) == 0; |
1 | 462 |
} |
463 |
||
464 |
// Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the |
|
465 |
// do_addr() method. |
|
466 |
// |
|
467 |
// The closure is initialized with the number of heap words to process |
|
468 |
// (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() |
|
469 |
// methods in subclasses should update the total as words are processed. Since |
|
470 |
// only one subclass actually uses this mechanism to terminate iteration, the |
|
471 |
// default initial value is > 0. The implementation is here and not in the |
|
472 |
// single subclass that uses it to avoid making is_full() virtual, and thus |
|
473 |
// adding a virtual call per live object. |
|
474 |
||
475 |
class ParMarkBitMapClosure: public StackObj { |
|
476 |
public: |
|
477 |
typedef ParMarkBitMap::idx_t idx_t; |
|
478 |
typedef ParMarkBitMap::IterationStatus IterationStatus; |
|
479 |
||
480 |
public: |
|
481 |
inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, |
|
482 |
size_t words = max_uintx); |
|
483 |
||
484 |
inline ParCompactionManager* compaction_manager() const; |
|
485 |
inline ParMarkBitMap* bitmap() const; |
|
486 |
inline size_t words_remaining() const; |
|
487 |
inline bool is_full() const; |
|
488 |
inline HeapWord* source() const; |
|
489 |
||
490 |
inline void set_source(HeapWord* addr); |
|
491 |
||
492 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; |
|
493 |
||
494 |
protected: |
|
495 |
inline void decrement_words_remaining(size_t words); |
|
496 |
||
497 |
private: |
|
498 |
ParMarkBitMap* const _bitmap; |
|
499 |
ParCompactionManager* const _compaction_manager; |
|
500 |
DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. |
|
501 |
size_t _words_remaining; // Words left to copy. |
|
502 |
||
503 |
protected: |
|
504 |
HeapWord* _source; // Next addr that would be read. |
|
505 |
}; |
|
506 |
||
507 |
inline |
|
508 |
ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, |
|
509 |
ParCompactionManager* cm, |
|
510 |
size_t words): |
|
511 |
_bitmap(bitmap), _compaction_manager(cm) |
|
512 |
#ifdef ASSERT |
|
513 |
, _initial_words_remaining(words) |
|
514 |
#endif |
|
515 |
{ |
|
516 |
_words_remaining = words; |
|
517 |
_source = NULL; |
|
518 |
} |
|
519 |
||
520 |
inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { |
|
521 |
return _compaction_manager; |
|
522 |
} |
|
523 |
||
524 |
inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { |
|
525 |
return _bitmap; |
|
526 |
} |
|
527 |
||
528 |
inline size_t ParMarkBitMapClosure::words_remaining() const { |
|
529 |
return _words_remaining; |
|
530 |
} |
|
531 |
||
532 |
inline bool ParMarkBitMapClosure::is_full() const { |
|
533 |
return words_remaining() == 0; |
|
534 |
} |
|
535 |
||
536 |
inline HeapWord* ParMarkBitMapClosure::source() const { |
|
537 |
return _source; |
|
538 |
} |
|
539 |
||
540 |
inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { |
|
541 |
_source = addr; |
|
542 |
} |
|
543 |
||
544 |
inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { |
|
545 |
assert(_words_remaining >= words, "processed too many words"); |
|
546 |
_words_remaining -= words; |
|
547 |
} |
|
548 |
||
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|
549 |
// The UseParallelOldGC collector is a stop-the-world garbage collector that |
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|
550 |
// does parts of the collection using parallel threads. The collection includes |
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|
551 |
// the tenured generation and the young generation. The permanent generation is |
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|
552 |
// collected at the same time as the other two generations but the permanent |
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|
553 |
// generation is collect by a single GC thread. The permanent generation is |
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|
554 |
// collected serially because of the requirement that during the processing of a |
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|
555 |
// klass AAA, any objects reference by AAA must already have been processed. |
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|
556 |
// This requirement is enforced by a left (lower address) to right (higher |
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|
557 |
// address) sliding compaction. |
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|
558 |
// |
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|
559 |
// There are four phases of the collection. |
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|
560 |
// |
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|
561 |
// - marking phase |
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|
562 |
// - summary phase |
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|
563 |
// - compacting phase |
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|
564 |
// - clean up phase |
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|
565 |
// |
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|
566 |
// Roughly speaking these phases correspond, respectively, to |
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|
567 |
// - mark all the live objects |
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|
568 |
// - calculate the destination of each object at the end of the collection |
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|
569 |
// - move the objects to their destination |
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|
570 |
// - update some references and reinitialize some variables |
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|
571 |
// |
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|
572 |
// These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
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|
573 |
// marking phase is implemented in PSParallelCompact::marking_phase() and does a |
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|
574 |
// complete marking of the heap. The summary phase is implemented in |
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|
575 |
// PSParallelCompact::summary_phase(). The move and update phase is implemented |
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|
576 |
// in PSParallelCompact::compact(). |
971
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|
577 |
// |
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|
578 |
// A space that is being collected is divided into regions and with each region |
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|
579 |
// is associated an object of type ParallelCompactData. Each region is of a |
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|
580 |
// fixed size and typically will contain more than 1 object and may have parts |
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changeset
|
581 |
// of objects at the front and back of the region. |
971
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|
582 |
// |
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|
583 |
// region -----+---------------------+---------- |
971
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|
584 |
// objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
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|
585 |
// |
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|
586 |
// The marking phase does a complete marking of all live objects in the heap. |
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|
587 |
// The marking also compiles the size of the data for all live objects covered |
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changeset
|
588 |
// by the region. This size includes the part of any live object spanning onto |
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changeset
|
589 |
// the region (part of AAA if it is live) from the front, all live objects |
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changeset
|
590 |
// contained in the region (BBB and/or CCC if they are live), and the part of |
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changeset
|
591 |
// any live objects covered by the region that extends off the region (part of |
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changeset
|
592 |
// DDD if it is live). The marking phase uses multiple GC threads and marking |
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changeset
|
593 |
// is done in a bit array of type ParMarkBitMap. The marking of the bit map is |
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changeset
|
594 |
// done atomically as is the accumulation of the size of the live objects |
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changeset
|
595 |
// covered by a region. |
971
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|
596 |
// |
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changeset
|
597 |
// The summary phase calculates the total live data to the left of each region |
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changeset
|
598 |
// XXX. Based on that total and the bottom of the space, it can calculate the |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
599 |
// starting location of the live data in XXX. The summary phase calculates for |
9006b01ba3fd
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diff
changeset
|
600 |
// each region XXX quantites such as |
971
f0b20be4165d
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diff
changeset
|
601 |
// |
1407
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diff
changeset
|
602 |
// - the amount of live data at the beginning of a region from an object |
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diff
changeset
|
603 |
// entering the region. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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977
diff
changeset
|
604 |
// - the location of the first live data on the region |
9006b01ba3fd
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changeset
|
605 |
// - a count of the number of regions receiving live data from XXX. |
971
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changeset
|
606 |
// |
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changeset
|
607 |
// See ParallelCompactData for precise details. The summary phase also |
1407
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diff
changeset
|
608 |
// calculates the dense prefix for the compaction. The dense prefix is a |
9006b01ba3fd
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diff
changeset
|
609 |
// portion at the beginning of the space that is not moved. The objects in the |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
610 |
// dense prefix do need to have their object references updated. See method |
9006b01ba3fd
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diff
changeset
|
611 |
// summarize_dense_prefix(). |
971
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changeset
|
612 |
// |
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changeset
|
613 |
// The summary phase is done using 1 GC thread. |
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diff
changeset
|
614 |
// |
1407
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diff
changeset
|
615 |
// The compaction phase moves objects to their new location and updates all |
9006b01ba3fd
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diff
changeset
|
616 |
// references in the object. |
971
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diff
changeset
|
617 |
// |
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diff
changeset
|
618 |
// A current exception is that objects that cross a region boundary are moved |
9006b01ba3fd
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diff
changeset
|
619 |
// but do not have their references updated. References are not updated because |
9006b01ba3fd
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diff
changeset
|
620 |
// it cannot easily be determined if the klass pointer KKK for the object AAA |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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977
diff
changeset
|
621 |
// has been updated. KKK likely resides in a region to the left of the region |
9006b01ba3fd
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977
diff
changeset
|
622 |
// containing AAA. These AAA's have there references updated at the end in a |
9006b01ba3fd
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diff
changeset
|
623 |
// clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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977
diff
changeset
|
624 |
// An alternate strategy is being investigated for this deferral of updating. |
971
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diff
changeset
|
625 |
// |
1407
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diff
changeset
|
626 |
// Compaction is done on a region basis. A region that is ready to be filled is |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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977
diff
changeset
|
627 |
// put on a ready list and GC threads take region off the list and fill them. A |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
628 |
// region is ready to be filled if it empty of live objects. Such a region may |
9006b01ba3fd
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diff
changeset
|
629 |
// have been initially empty (only contained dead objects) or may have had all |
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977
diff
changeset
|
630 |
// its live objects copied out already. A region that compacts into itself is |
9006b01ba3fd
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diff
changeset
|
631 |
// also ready for filling. The ready list is initially filled with empty |
9006b01ba3fd
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diff
changeset
|
632 |
// regions and regions compacting into themselves. There is always at least 1 |
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977
diff
changeset
|
633 |
// region that can be put on the ready list. The regions are atomically added |
9006b01ba3fd
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diff
changeset
|
634 |
// and removed from the ready list. |
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changeset
|
635 |
|
1 | 636 |
class PSParallelCompact : AllStatic { |
637 |
public: |
|
638 |
// Convenient access to type names. |
|
639 |
typedef ParMarkBitMap::idx_t idx_t; |
|
1407
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changeset
|
640 |
typedef ParallelCompactData::RegionData RegionData; |
1 | 641 |
|
642 |
typedef enum { |
|
643 |
perm_space_id, old_space_id, eden_space_id, |
|
644 |
from_space_id, to_space_id, last_space_id |
|
645 |
} SpaceId; |
|
646 |
||
647 |
public: |
|
360
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changeset
|
648 |
// Inline closure decls |
1 | 649 |
// |
650 |
class IsAliveClosure: public BoolObjectClosure { |
|
651 |
public: |
|
360
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|
652 |
virtual void do_object(oop p); |
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changeset
|
653 |
virtual bool do_object_b(oop p); |
1 | 654 |
}; |
655 |
||
656 |
class KeepAliveClosure: public OopClosure { |
|
360
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changeset
|
657 |
private: |
1 | 658 |
ParCompactionManager* _compaction_manager; |
360
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changeset
|
659 |
protected: |
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changeset
|
660 |
template <class T> inline void do_oop_work(T* p); |
1 | 661 |
public: |
360
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|
662 |
KeepAliveClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
21d113ecbf6a
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changeset
|
663 |
virtual void do_oop(oop* p); |
21d113ecbf6a
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changeset
|
664 |
virtual void do_oop(narrowOop* p); |
1 | 665 |
}; |
666 |
||
360
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|
667 |
// Current unused |
21d113ecbf6a
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changeset
|
668 |
class FollowRootClosure: public OopsInGenClosure { |
21d113ecbf6a
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changeset
|
669 |
private: |
1 | 670 |
ParCompactionManager* _compaction_manager; |
671 |
public: |
|
360
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|
672 |
FollowRootClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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changeset
|
673 |
virtual void do_oop(oop* p); |
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changeset
|
674 |
virtual void do_oop(narrowOop* p); |
1 | 675 |
virtual const bool do_nmethods() const { return true; } |
676 |
}; |
|
677 |
||
678 |
class FollowStackClosure: public VoidClosure { |
|
360
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changeset
|
679 |
private: |
1 | 680 |
ParCompactionManager* _compaction_manager; |
681 |
public: |
|
360
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|
682 |
FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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|
683 |
virtual void do_void(); |
1 | 684 |
}; |
685 |
||
686 |
class AdjustPointerClosure: public OopsInGenClosure { |
|
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687 |
private: |
1 | 688 |
bool _is_root; |
689 |
public: |
|
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|
690 |
AdjustPointerClosure(bool is_root) : _is_root(is_root) { } |
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|
691 |
virtual void do_oop(oop* p); |
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|
692 |
virtual void do_oop(narrowOop* p); |
1 | 693 |
}; |
694 |
||
695 |
// Closure for verifying update of pointers. Does not |
|
696 |
// have any side effects. |
|
697 |
class VerifyUpdateClosure: public ParMarkBitMapClosure { |
|
698 |
const MutableSpace* _space; // Is this ever used? |
|
699 |
||
700 |
public: |
|
701 |
VerifyUpdateClosure(ParCompactionManager* cm, const MutableSpace* sp) : |
|
702 |
ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), _space(sp) |
|
703 |
{ } |
|
704 |
||
705 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words); |
|
706 |
||
707 |
const MutableSpace* space() { return _space; } |
|
708 |
}; |
|
709 |
||
710 |
// Closure for updating objects altered for debug checking |
|
711 |
class ResetObjectsClosure: public ParMarkBitMapClosure { |
|
712 |
public: |
|
713 |
ResetObjectsClosure(ParCompactionManager* cm): |
|
714 |
ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm) |
|
715 |
{ } |
|
716 |
||
717 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words); |
|
718 |
}; |
|
719 |
||
720 |
friend class KeepAliveClosure; |
|
721 |
friend class FollowStackClosure; |
|
722 |
friend class AdjustPointerClosure; |
|
723 |
friend class FollowRootClosure; |
|
724 |
friend class instanceKlassKlass; |
|
725 |
friend class RefProcTaskProxy; |
|
726 |
||
727 |
private: |
|
728 |
static elapsedTimer _accumulated_time; |
|
729 |
static unsigned int _total_invocations; |
|
730 |
static unsigned int _maximum_compaction_gc_num; |
|
731 |
static jlong _time_of_last_gc; // ms |
|
732 |
static CollectorCounters* _counters; |
|
733 |
static ParMarkBitMap _mark_bitmap; |
|
734 |
static ParallelCompactData _summary_data; |
|
735 |
static IsAliveClosure _is_alive_closure; |
|
736 |
static SpaceInfo _space_info[last_space_id]; |
|
737 |
static bool _print_phases; |
|
738 |
static AdjustPointerClosure _adjust_root_pointer_closure; |
|
739 |
static AdjustPointerClosure _adjust_pointer_closure; |
|
740 |
||
741 |
// Reference processing (used in ...follow_contents) |
|
742 |
static ReferenceProcessor* _ref_processor; |
|
743 |
||
744 |
// Updated location of intArrayKlassObj. |
|
745 |
static klassOop _updated_int_array_klass_obj; |
|
746 |
||
747 |
// Values computed at initialization and used by dead_wood_limiter(). |
|
748 |
static double _dwl_mean; |
|
749 |
static double _dwl_std_dev; |
|
750 |
static double _dwl_first_term; |
|
751 |
static double _dwl_adjustment; |
|
752 |
#ifdef ASSERT |
|
753 |
static bool _dwl_initialized; |
|
754 |
#endif // #ifdef ASSERT |
|
755 |
||
756 |
private: |
|
757 |
// Closure accessors |
|
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|
758 |
static OopClosure* adjust_pointer_closure() { return (OopClosure*)&_adjust_pointer_closure; } |
1 | 759 |
static OopClosure* adjust_root_pointer_closure() { return (OopClosure*)&_adjust_root_pointer_closure; } |
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|
760 |
static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
1 | 761 |
|
762 |
static void initialize_space_info(); |
|
763 |
||
764 |
// Return true if details about individual phases should be printed. |
|
765 |
static inline bool print_phases(); |
|
766 |
||
767 |
// Clear the marking bitmap and summary data that cover the specified space. |
|
768 |
static void clear_data_covering_space(SpaceId id); |
|
769 |
||
770 |
static void pre_compact(PreGCValues* pre_gc_values); |
|
771 |
static void post_compact(); |
|
772 |
||
773 |
// Mark live objects |
|
774 |
static void marking_phase(ParCompactionManager* cm, |
|
775 |
bool maximum_heap_compaction); |
|
776 |
static void follow_stack(ParCompactionManager* cm); |
|
777 |
static void follow_weak_klass_links(ParCompactionManager* cm); |
|
778 |
||
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|
779 |
template <class T> static inline void adjust_pointer(T* p, bool is_root); |
1 | 780 |
static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
781 |
||
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|
782 |
template <class T> |
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|
783 |
static inline void follow_root(ParCompactionManager* cm, T* p); |
1 | 784 |
|
785 |
// Compute the dense prefix for the designated space. This is an experimental |
|
786 |
// implementation currently not used in production. |
|
787 |
static HeapWord* compute_dense_prefix_via_density(const SpaceId id, |
|
788 |
bool maximum_compaction); |
|
789 |
||
790 |
// Methods used to compute the dense prefix. |
|
791 |
||
792 |
// Compute the value of the normal distribution at x = density. The mean and |
|
793 |
// standard deviation are values saved by initialize_dead_wood_limiter(). |
|
794 |
static inline double normal_distribution(double density); |
|
795 |
||
796 |
// Initialize the static vars used by dead_wood_limiter(). |
|
797 |
static void initialize_dead_wood_limiter(); |
|
798 |
||
799 |
// Return the percentage of space that can be treated as "dead wood" (i.e., |
|
800 |
// not reclaimed). |
|
801 |
static double dead_wood_limiter(double density, size_t min_percent); |
|
802 |
||
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|
803 |
// Find the first (left-most) region in the range [beg, end) that has at least |
1 | 804 |
// dead_words of dead space to the left. The argument beg must be the first |
1407
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changeset
|
805 |
// region in the space that is not completely live. |
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changeset
|
806 |
static RegionData* dead_wood_limit_region(const RegionData* beg, |
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changeset
|
807 |
const RegionData* end, |
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changeset
|
808 |
size_t dead_words); |
1 | 809 |
|
1407
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changeset
|
810 |
// Return a pointer to the first region in the range [beg, end) that is not |
1 | 811 |
// completely full. |
1407
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changeset
|
812 |
static RegionData* first_dead_space_region(const RegionData* beg, |
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changeset
|
813 |
const RegionData* end); |
1 | 814 |
|
815 |
// Return a value indicating the benefit or 'yield' if the compacted region |
|
816 |
// were to start (or equivalently if the dense prefix were to end) at the |
|
1407
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diff
changeset
|
817 |
// candidate region. Higher values are better. |
1 | 818 |
// |
819 |
// The value is based on the amount of space reclaimed vs. the costs of (a) |
|
820 |
// updating references in the dense prefix plus (b) copying objects and |
|
821 |
// updating references in the compacted region. |
|
1407
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diff
changeset
|
822 |
static inline double reclaimed_ratio(const RegionData* const candidate, |
1 | 823 |
HeapWord* const bottom, |
824 |
HeapWord* const top, |
|
825 |
HeapWord* const new_top); |
|
826 |
||
827 |
// Compute the dense prefix for the designated space. |
|
828 |
static HeapWord* compute_dense_prefix(const SpaceId id, |
|
829 |
bool maximum_compaction); |
|
830 |
||
1407
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977
diff
changeset
|
831 |
// Return true if dead space crosses onto the specified Region; bit must be |
9006b01ba3fd
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977
diff
changeset
|
832 |
// the bit index corresponding to the first word of the Region. |
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diff
changeset
|
833 |
static inline bool dead_space_crosses_boundary(const RegionData* region, |
1 | 834 |
idx_t bit); |
835 |
||
836 |
// Summary phase utility routine to fill dead space (if any) at the dense |
|
837 |
// prefix boundary. Should only be called if the the dense prefix is |
|
838 |
// non-empty. |
|
839 |
static void fill_dense_prefix_end(SpaceId id); |
|
840 |
||
841 |
static void summarize_spaces_quick(); |
|
842 |
static void summarize_space(SpaceId id, bool maximum_compaction); |
|
843 |
static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); |
|
844 |
||
845 |
// The space that is compacted after space_id. |
|
846 |
static SpaceId next_compaction_space_id(SpaceId space_id); |
|
847 |
||
848 |
// Adjust addresses in roots. Does not adjust addresses in heap. |
|
849 |
static void adjust_roots(); |
|
850 |
||
851 |
// Serial code executed in preparation for the compaction phase. |
|
852 |
static void compact_prologue(); |
|
853 |
||
854 |
// Move objects to new locations. |
|
855 |
static void compact_perm(ParCompactionManager* cm); |
|
856 |
static void compact(); |
|
857 |
||
1407
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977
diff
changeset
|
858 |
// Add available regions to the stack and draining tasks to the task queue. |
9006b01ba3fd
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977
diff
changeset
|
859 |
static void enqueue_region_draining_tasks(GCTaskQueue* q, |
9006b01ba3fd
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977
diff
changeset
|
860 |
uint parallel_gc_threads); |
1 | 861 |
|
862 |
// Add dense prefix update tasks to the task queue. |
|
863 |
static void enqueue_dense_prefix_tasks(GCTaskQueue* q, |
|
864 |
uint parallel_gc_threads); |
|
865 |
||
1407
9006b01ba3fd
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parents:
977
diff
changeset
|
866 |
// Add region stealing tasks to the task queue. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
867 |
static void enqueue_region_stealing_tasks( |
1 | 868 |
GCTaskQueue* q, |
869 |
ParallelTaskTerminator* terminator_ptr, |
|
870 |
uint parallel_gc_threads); |
|
871 |
||
872 |
// For debugging only - compacts the old gen serially |
|
873 |
static void compact_serial(ParCompactionManager* cm); |
|
874 |
||
875 |
// If objects are left in eden after a collection, try to move the boundary |
|
876 |
// and absorb them into the old gen. Returns true if eden was emptied. |
|
877 |
static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, |
|
878 |
PSYoungGen* young_gen, |
|
879 |
PSOldGen* old_gen); |
|
880 |
||
881 |
// Reset time since last full gc |
|
882 |
static void reset_millis_since_last_gc(); |
|
883 |
||
884 |
protected: |
|
885 |
#ifdef VALIDATE_MARK_SWEEP |
|
360
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|
886 |
static GrowableArray<void*>* _root_refs_stack; |
1 | 887 |
static GrowableArray<oop> * _live_oops; |
888 |
static GrowableArray<oop> * _live_oops_moved_to; |
|
889 |
static GrowableArray<size_t>* _live_oops_size; |
|
890 |
static size_t _live_oops_index; |
|
891 |
static size_t _live_oops_index_at_perm; |
|
360
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|
892 |
static GrowableArray<void*>* _other_refs_stack; |
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diff
changeset
|
893 |
static GrowableArray<void*>* _adjusted_pointers; |
1 | 894 |
static bool _pointer_tracking; |
895 |
static bool _root_tracking; |
|
896 |
||
897 |
// The following arrays are saved since the time of the last GC and |
|
898 |
// assist in tracking down problems where someone has done an errant |
|
899 |
// store into the heap, usually to an oop that wasn't properly |
|
900 |
// handleized across a GC. If we crash or otherwise fail before the |
|
901 |
// next GC, we can query these arrays to find out the object we had |
|
902 |
// intended to do the store to (assuming it is still alive) and the |
|
903 |
// offset within that object. Covered under RecordMarkSweepCompaction. |
|
904 |
static GrowableArray<HeapWord*> * _cur_gc_live_oops; |
|
905 |
static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; |
|
906 |
static GrowableArray<size_t>* _cur_gc_live_oops_size; |
|
907 |
static GrowableArray<HeapWord*> * _last_gc_live_oops; |
|
908 |
static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; |
|
909 |
static GrowableArray<size_t>* _last_gc_live_oops_size; |
|
910 |
#endif |
|
911 |
||
912 |
public: |
|
913 |
class MarkAndPushClosure: public OopClosure { |
|
360
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|
914 |
private: |
1 | 915 |
ParCompactionManager* _compaction_manager; |
916 |
public: |
|
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|
917 |
MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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|
918 |
virtual void do_oop(oop* p); |
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|
919 |
virtual void do_oop(narrowOop* p); |
1 | 920 |
virtual const bool do_nmethods() const { return true; } |
921 |
}; |
|
922 |
||
923 |
PSParallelCompact(); |
|
924 |
||
925 |
// Convenient accessor for Universe::heap(). |
|
926 |
static ParallelScavengeHeap* gc_heap() { |
|
927 |
return (ParallelScavengeHeap*)Universe::heap(); |
|
928 |
} |
|
929 |
||
930 |
static void invoke(bool maximum_heap_compaction); |
|
931 |
static void invoke_no_policy(bool maximum_heap_compaction); |
|
932 |
||
933 |
static void post_initialize(); |
|
934 |
// Perform initialization for PSParallelCompact that requires |
|
935 |
// allocations. This should be called during the VM initialization |
|
936 |
// at a pointer where it would be appropriate to return a JNI_ENOMEM |
|
937 |
// in the event of a failure. |
|
938 |
static bool initialize(); |
|
939 |
||
940 |
// Public accessors |
|
941 |
static elapsedTimer* accumulated_time() { return &_accumulated_time; } |
|
942 |
static unsigned int total_invocations() { return _total_invocations; } |
|
943 |
static CollectorCounters* counters() { return _counters; } |
|
944 |
||
945 |
// Used to add tasks |
|
946 |
static GCTaskManager* const gc_task_manager(); |
|
947 |
static klassOop updated_int_array_klass_obj() { |
|
948 |
return _updated_int_array_klass_obj; |
|
949 |
} |
|
950 |
||
951 |
// Marking support |
|
952 |
static inline bool mark_obj(oop obj); |
|
360
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|
953 |
// Check mark and maybe push on marking stack |
21d113ecbf6a
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changeset
|
954 |
template <class T> static inline void mark_and_push(ParCompactionManager* cm, |
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changeset
|
955 |
T* p); |
1 | 956 |
|
957 |
// Compaction support. |
|
958 |
// Return true if p is in the range [beg_addr, end_addr). |
|
959 |
static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); |
|
960 |
static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); |
|
961 |
||
962 |
// Convenience wrappers for per-space data kept in _space_info. |
|
963 |
static inline MutableSpace* space(SpaceId space_id); |
|
964 |
static inline HeapWord* new_top(SpaceId space_id); |
|
965 |
static inline HeapWord* dense_prefix(SpaceId space_id); |
|
966 |
static inline ObjectStartArray* start_array(SpaceId space_id); |
|
967 |
||
968 |
// Return true if the klass should be updated. |
|
969 |
static inline bool should_update_klass(klassOop k); |
|
970 |
||
971 |
// Move and update the live objects in the specified space. |
|
972 |
static void move_and_update(ParCompactionManager* cm, SpaceId space_id); |
|
973 |
||
1407
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changeset
|
974 |
// Process the end of the given region range in the dense prefix. |
1 | 975 |
// This includes saving any object not updated. |
1407
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changeset
|
976 |
static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
9006b01ba3fd
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diff
changeset
|
977 |
size_t region_start_index, |
9006b01ba3fd
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diff
changeset
|
978 |
size_t region_end_index, |
9006b01ba3fd
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changeset
|
979 |
idx_t exiting_object_offset, |
9006b01ba3fd
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977
diff
changeset
|
980 |
idx_t region_offset_start, |
9006b01ba3fd
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changeset
|
981 |
idx_t region_offset_end); |
1 | 982 |
|
1407
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977
diff
changeset
|
983 |
// Update a region in the dense prefix. For each live object |
9006b01ba3fd
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changeset
|
984 |
// in the region, update it's interior references. For each |
1 | 985 |
// dead object, fill it with deadwood. Dead space at the end |
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986 |
// of a region range will be filled to the start of the next |
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|
987 |
// live object regardless of the region_index_end. None of the |
1 | 988 |
// objects in the dense prefix move and dead space is dead |
989 |
// (holds only dead objects that don't need any processing), so |
|
990 |
// dead space can be filled in any order. |
|
991 |
static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, |
|
992 |
SpaceId space_id, |
|
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|
993 |
size_t region_index_start, |
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|
994 |
size_t region_index_end); |
1 | 995 |
|
996 |
// Return the address of the count + 1st live word in the range [beg, end). |
|
997 |
static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); |
|
998 |
||
999 |
// Return the address of the word to be copied to dest_addr, which must be |
|
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|
1000 |
// aligned to a region boundary. |
1 | 1001 |
static HeapWord* first_src_addr(HeapWord* const dest_addr, |
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|
1002 |
size_t src_region_idx); |
1 | 1003 |
|
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|
1004 |
// Determine the next source region, set closure.source() to the start of the |
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|
1005 |
// new region return the region index. Parameter end_addr is the address one |
1 | 1006 |
// beyond the end of source range just processed. If necessary, switch to a |
1007 |
// new source space and set src_space_id (in-out parameter) and src_space_top |
|
1008 |
// (out parameter) accordingly. |
|
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|
1009 |
static size_t next_src_region(MoveAndUpdateClosure& closure, |
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|
1010 |
SpaceId& src_space_id, |
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|
1011 |
HeapWord*& src_space_top, |
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|
1012 |
HeapWord* end_addr); |
1 | 1013 |
|
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|
1014 |
// Decrement the destination count for each non-empty source region in the |
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|
1015 |
// range [beg_region, region(region_align_up(end_addr))). |
1 | 1016 |
static void decrement_destination_counts(ParCompactionManager* cm, |
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|
1017 |
size_t beg_region, |
1 | 1018 |
HeapWord* end_addr); |
1019 |
||
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|
1020 |
// Fill a region, copying objects from one or more source regions. |
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|
1021 |
static void fill_region(ParCompactionManager* cm, size_t region_idx); |
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|
1022 |
static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
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|
1023 |
fill_region(cm, region); |
1 | 1024 |
} |
1025 |
||
1026 |
// Update the deferred objects in the space. |
|
1027 |
static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); |
|
1028 |
||
1029 |
// Mark pointer and follow contents. |
|
360
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|
1030 |
template <class T> |
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|
1031 |
static inline void mark_and_follow(ParCompactionManager* cm, T* p); |
1 | 1032 |
|
1033 |
static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } |
|
1034 |
static ParallelCompactData& summary_data() { return _summary_data; } |
|
1035 |
||
360
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|
1036 |
static inline void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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|
1037 |
static inline void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
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|
1038 |
|
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|
1039 |
template <class T> |
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|
1040 |
static inline void adjust_pointer(T* p, |
1 | 1041 |
HeapWord* beg_addr, |
1042 |
HeapWord* end_addr); |
|
1043 |
||
1044 |
// Reference Processing |
|
1045 |
static ReferenceProcessor* const ref_processor() { return _ref_processor; } |
|
1046 |
||
1047 |
// Return the SpaceId for the given address. |
|
1048 |
static SpaceId space_id(HeapWord* addr); |
|
1049 |
||
1050 |
// Time since last full gc (in milliseconds). |
|
1051 |
static jlong millis_since_last_gc(); |
|
1052 |
||
1053 |
#ifdef VALIDATE_MARK_SWEEP |
|
360
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|
1054 |
static void track_adjusted_pointer(void* p, bool isroot); |
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|
1055 |
static void check_adjust_pointer(void* p); |
1 | 1056 |
static void track_interior_pointers(oop obj); |
1057 |
static void check_interior_pointers(); |
|
1058 |
||
1059 |
static void reset_live_oop_tracking(bool at_perm); |
|
1060 |
static void register_live_oop(oop p, size_t size); |
|
1061 |
static void validate_live_oop(oop p, size_t size); |
|
1062 |
static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); |
|
1063 |
static void compaction_complete(); |
|
1064 |
||
1065 |
// Querying operation of RecordMarkSweepCompaction results. |
|
1066 |
// Finds and prints the current base oop and offset for a word |
|
1067 |
// within an oop that was live during the last GC. Helpful for |
|
1068 |
// tracking down heap stomps. |
|
1069 |
static void print_new_location_of_heap_address(HeapWord* q); |
|
1070 |
#endif // #ifdef VALIDATE_MARK_SWEEP |
|
1071 |
||
1072 |
// Call backs for class unloading |
|
1073 |
// Update subklass/sibling/implementor links at end of marking. |
|
1074 |
static void revisit_weak_klass_link(ParCompactionManager* cm, Klass* k); |
|
1075 |
||
1076 |
#ifndef PRODUCT |
|
1077 |
// Debugging support. |
|
1078 |
static const char* space_names[last_space_id]; |
|
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|
1079 |
static void print_region_ranges(); |
1 | 1080 |
static void print_dense_prefix_stats(const char* const algorithm, |
1081 |
const SpaceId id, |
|
1082 |
const bool maximum_compaction, |
|
1083 |
HeapWord* const addr); |
|
1084 |
#endif // #ifndef PRODUCT |
|
1085 |
||
1086 |
#ifdef ASSERT |
|
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|
1087 |
// Verify that all the regions have been emptied. |
1 | 1088 |
static void verify_complete(SpaceId space_id); |
1089 |
#endif // #ifdef ASSERT |
|
1090 |
}; |
|
1091 |
||
360
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|
1092 |
inline bool PSParallelCompact::mark_obj(oop obj) { |
1 | 1093 |
const int obj_size = obj->size(); |
1094 |
if (mark_bitmap()->mark_obj(obj, obj_size)) { |
|
1095 |
_summary_data.add_obj(obj, obj_size); |
|
1096 |
return true; |
|
1097 |
} else { |
|
1098 |
return false; |
|
1099 |
} |
|
1100 |
} |
|
1101 |
||
360
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|
1102 |
template <class T> |
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|
1103 |
inline void PSParallelCompact::follow_root(ParCompactionManager* cm, T* p) { |
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|
1104 |
assert(!Universe::heap()->is_in_reserved(p), |
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|
1105 |
"roots shouldn't be things within the heap"); |
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|
1106 |
#ifdef VALIDATE_MARK_SWEEP |
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|
1107 |
if (ValidateMarkSweep) { |
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|
1108 |
guarantee(!_root_refs_stack->contains(p), "should only be in here once"); |
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|
1109 |
_root_refs_stack->push(p); |
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|
1110 |
} |
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|
1111 |
#endif |
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|
1112 |
T heap_oop = oopDesc::load_heap_oop(p); |
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|
1113 |
if (!oopDesc::is_null(heap_oop)) { |
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|
1114 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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|
1115 |
if (mark_bitmap()->is_unmarked(obj)) { |
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|
1116 |
if (mark_obj(obj)) { |
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|
1117 |
obj->follow_contents(cm); |
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|
1118 |
} |
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|
1119 |
} |
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|
1120 |
} |
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|
1121 |
follow_stack(cm); |
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|
1122 |
} |
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|
1123 |
|
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|
1124 |
template <class T> |
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|
1125 |
inline void PSParallelCompact::mark_and_follow(ParCompactionManager* cm, |
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|
1126 |
T* p) { |
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|
1127 |
T heap_oop = oopDesc::load_heap_oop(p); |
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|
1128 |
if (!oopDesc::is_null(heap_oop)) { |
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|
1129 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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|
1130 |
if (mark_bitmap()->is_unmarked(obj)) { |
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|
1131 |
if (mark_obj(obj)) { |
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|
1132 |
obj->follow_contents(cm); |
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|
1133 |
} |
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|
1134 |
} |
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|
1135 |
} |
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|
1136 |
} |
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|
1137 |
|
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|
1138 |
template <class T> |
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|
1139 |
inline void PSParallelCompact::mark_and_push(ParCompactionManager* cm, T* p) { |
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|
1140 |
T heap_oop = oopDesc::load_heap_oop(p); |
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|
1141 |
if (!oopDesc::is_null(heap_oop)) { |
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|
1142 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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|
1143 |
if (mark_bitmap()->is_unmarked(obj)) { |
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|
1144 |
if (mark_obj(obj)) { |
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|
1145 |
// This thread marked the object and owns the subsequent processing of it. |
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|
1146 |
cm->save_for_scanning(obj); |
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changeset
|
1147 |
} |
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changeset
|
1148 |
} |
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changeset
|
1149 |
} |
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|
1150 |
} |
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|
1151 |
|
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|
1152 |
template <class T> |
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|
1153 |
inline void PSParallelCompact::adjust_pointer(T* p, bool isroot) { |
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|
1154 |
T heap_oop = oopDesc::load_heap_oop(p); |
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|
1155 |
if (!oopDesc::is_null(heap_oop)) { |
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changeset
|
1156 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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|
1157 |
oop new_obj = (oop)summary_data().calc_new_pointer(obj); |
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|
1158 |
assert(new_obj != NULL || // is forwarding ptr? |
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|
1159 |
obj->is_shared(), // never forwarded? |
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|
1160 |
"should be forwarded"); |
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|
1161 |
// Just always do the update unconditionally? |
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|
1162 |
if (new_obj != NULL) { |
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|
1163 |
assert(Universe::heap()->is_in_reserved(new_obj), |
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|
1164 |
"should be in object space"); |
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|
1165 |
oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
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|
1166 |
} |
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|
1167 |
} |
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|
1168 |
VALIDATE_MARK_SWEEP_ONLY(track_adjusted_pointer(p, isroot)); |
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|
1169 |
} |
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|
1170 |
|
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|
1171 |
template <class T> |
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|
1172 |
inline void PSParallelCompact::KeepAliveClosure::do_oop_work(T* p) { |
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|
1173 |
#ifdef VALIDATE_MARK_SWEEP |
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|
1174 |
if (ValidateMarkSweep) { |
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|
1175 |
if (!Universe::heap()->is_in_reserved(p)) { |
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|
1176 |
_root_refs_stack->push(p); |
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|
1177 |
} else { |
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|
1178 |
_other_refs_stack->push(p); |
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|
1179 |
} |
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|
1180 |
} |
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|
1181 |
#endif |
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|
1182 |
mark_and_push(_compaction_manager, p); |
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|
1183 |
} |
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|
1184 |
|
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|
1185 |
inline bool PSParallelCompact::print_phases() { |
1 | 1186 |
return _print_phases; |
1187 |
} |
|
1188 |
||
360
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|
1189 |
inline double PSParallelCompact::normal_distribution(double density) { |
1 | 1190 |
assert(_dwl_initialized, "uninitialized"); |
1191 |
const double squared_term = (density - _dwl_mean) / _dwl_std_dev; |
|
1192 |
return _dwl_first_term * exp(-0.5 * squared_term * squared_term); |
|
1193 |
} |
|
1194 |
||
1195 |
inline bool |
|
1407
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|
1196 |
PSParallelCompact::dead_space_crosses_boundary(const RegionData* region, |
1 | 1197 |
idx_t bit) |
1198 |
{ |
|
1407
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|
1199 |
assert(bit > 0, "cannot call this for the first bit/region"); |
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|
1200 |
assert(_summary_data.region_to_addr(region) == _mark_bitmap.bit_to_addr(bit), |
1 | 1201 |
"sanity check"); |
1202 |
||
1203 |
// Dead space crosses the boundary if (1) a partial object does not extend |
|
1407
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|
1204 |
// onto the region, (2) an object does not start at the beginning of the |
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|
1205 |
// region, and (3) an object does not end at the end of the prior region. |
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|
1206 |
return region->partial_obj_size() == 0 && |
1 | 1207 |
!_mark_bitmap.is_obj_beg(bit) && |
1208 |
!_mark_bitmap.is_obj_end(bit - 1); |
|
1209 |
} |
|
1210 |
||
1211 |
inline bool |
|
1212 |
PSParallelCompact::is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr) { |
|
1213 |
return p >= beg_addr && p < end_addr; |
|
1214 |
} |
|
1215 |
||
1216 |
inline bool |
|
1217 |
PSParallelCompact::is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr) { |
|
1218 |
return is_in((HeapWord*)p, beg_addr, end_addr); |
|
1219 |
} |
|
1220 |
||
1221 |
inline MutableSpace* PSParallelCompact::space(SpaceId id) { |
|
1222 |
assert(id < last_space_id, "id out of range"); |
|
1223 |
return _space_info[id].space(); |
|
1224 |
} |
|
1225 |
||
1226 |
inline HeapWord* PSParallelCompact::new_top(SpaceId id) { |
|
1227 |
assert(id < last_space_id, "id out of range"); |
|
1228 |
return _space_info[id].new_top(); |
|
1229 |
} |
|
1230 |
||
1231 |
inline HeapWord* PSParallelCompact::dense_prefix(SpaceId id) { |
|
1232 |
assert(id < last_space_id, "id out of range"); |
|
1233 |
return _space_info[id].dense_prefix(); |
|
1234 |
} |
|
1235 |
||
1236 |
inline ObjectStartArray* PSParallelCompact::start_array(SpaceId id) { |
|
1237 |
assert(id < last_space_id, "id out of range"); |
|
1238 |
return _space_info[id].start_array(); |
|
1239 |
} |
|
1240 |
||
1241 |
inline bool PSParallelCompact::should_update_klass(klassOop k) { |
|
1242 |
return ((HeapWord*) k) >= dense_prefix(perm_space_id); |
|
1243 |
} |
|
1244 |
||
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|
1245 |
template <class T> |
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|
1246 |
inline void PSParallelCompact::adjust_pointer(T* p, |
1 | 1247 |
HeapWord* beg_addr, |
1248 |
HeapWord* end_addr) { |
|
360
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|
1249 |
if (is_in((HeapWord*)p, beg_addr, end_addr)) { |
1 | 1250 |
adjust_pointer(p); |
1251 |
} |
|
1252 |
} |
|
1253 |
||
1254 |
class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
|
1255 |
public: |
|
1256 |
inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, |
|
1257 |
ObjectStartArray* start_array, |
|
1258 |
HeapWord* destination, size_t words); |
|
1259 |
||
1260 |
// Accessors. |
|
1261 |
HeapWord* destination() const { return _destination; } |
|
1262 |
||
1263 |
// If the object will fit (size <= words_remaining()), copy it to the current |
|
1264 |
// destination, update the interior oops and the start array and return either |
|
1265 |
// full (if the closure is full) or incomplete. If the object will not fit, |
|
1266 |
// return would_overflow. |
|
1267 |
virtual IterationStatus do_addr(HeapWord* addr, size_t size); |
|
1268 |
||
1269 |
// Copy enough words to fill this closure, starting at source(). Interior |
|
1270 |
// oops and the start array are not updated. Return full. |
|
1271 |
IterationStatus copy_until_full(); |
|
1272 |
||
1273 |
// Copy enough words to fill this closure or to the end of an object, |
|
1274 |
// whichever is smaller, starting at source(). Interior oops and the start |
|
1275 |
// array are not updated. |
|
1276 |
void copy_partial_obj(); |
|
1277 |
||
1278 |
protected: |
|
1279 |
// Update variables to indicate that word_count words were processed. |
|
1280 |
inline void update_state(size_t word_count); |
|
1281 |
||
1282 |
protected: |
|
1283 |
ObjectStartArray* const _start_array; |
|
1284 |
HeapWord* _destination; // Next addr to be written. |
|
1285 |
}; |
|
1286 |
||
1287 |
inline |
|
1288 |
MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, |
|
1289 |
ParCompactionManager* cm, |
|
1290 |
ObjectStartArray* start_array, |
|
1291 |
HeapWord* destination, |
|
1292 |
size_t words) : |
|
1293 |
ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) |
|
1294 |
{ |
|
1295 |
_destination = destination; |
|
1296 |
} |
|
1297 |
||
1298 |
inline void MoveAndUpdateClosure::update_state(size_t words) |
|
1299 |
{ |
|
1300 |
decrement_words_remaining(words); |
|
1301 |
_source += words; |
|
1302 |
_destination += words; |
|
1303 |
} |
|
1304 |
||
1305 |
class UpdateOnlyClosure: public ParMarkBitMapClosure { |
|
1306 |
private: |
|
1307 |
const PSParallelCompact::SpaceId _space_id; |
|
1308 |
ObjectStartArray* const _start_array; |
|
1309 |
||
1310 |
public: |
|
1311 |
UpdateOnlyClosure(ParMarkBitMap* mbm, |
|
1312 |
ParCompactionManager* cm, |
|
1313 |
PSParallelCompact::SpaceId space_id); |
|
1314 |
||
1315 |
// Update the object. |
|
1316 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words); |
|
1317 |
||
1318 |
inline void do_addr(HeapWord* addr); |
|
1319 |
}; |
|
1320 |
||
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|
1321 |
inline void UpdateOnlyClosure::do_addr(HeapWord* addr) |
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|
1322 |
{ |
1 | 1323 |
_start_array->allocate_block(addr); |
1324 |
oop(addr)->update_contents(compaction_manager()); |
|
1325 |
} |
|
1326 |
||
1327 |
class FillClosure: public ParMarkBitMapClosure { |
|
360
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|
1328 |
public: |
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|
1329 |
FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id) : |
1 | 1330 |
ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), |
1331 |
_space_id(space_id), |
|
360
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|
1332 |
_start_array(PSParallelCompact::start_array(space_id)) { |
1 | 1333 |
assert(_space_id == PSParallelCompact::perm_space_id || |
1334 |
_space_id == PSParallelCompact::old_space_id, |
|
1335 |
"cannot use FillClosure in the young gen"); |
|
1336 |
assert(bitmap() != NULL, "need a bitmap"); |
|
1337 |
assert(_start_array != NULL, "need a start array"); |
|
1338 |
} |
|
1339 |
||
1340 |
void fill_region(HeapWord* addr, size_t size) { |
|
1341 |
MemRegion region(addr, size); |
|
1342 |
SharedHeap::fill_region_with_object(region); |
|
1343 |
_start_array->allocate_block(addr); |
|
1344 |
} |
|
1345 |
||
1346 |
virtual IterationStatus do_addr(HeapWord* addr, size_t size) { |
|
1347 |
fill_region(addr, size); |
|
1348 |
return ParMarkBitMap::incomplete; |
|
1349 |
} |
|
1350 |
||
1351 |
private: |
|
1352 |
const PSParallelCompact::SpaceId _space_id; |
|
1353 |
ObjectStartArray* const _start_array; |
|
1354 |
}; |