author | jcoomes |
Tue, 30 Sep 2008 12:20:22 -0700 | |
changeset 1407 | 9006b01ba3fd |
parent 977 | b90650e2a9f7 |
child 1408 | e9c4f37aed49 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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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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static const size_t Log2BlockSize; |
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static const size_t BlockSize; |
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static const size_t BlockOffsetMask; |
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static const size_t BlockMask; |
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static const size_t BlocksPerRegion; |
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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. |
1 | 199 |
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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; |
1 | 205 |
#ifdef ASSERT |
206 |
// 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; |
1 | 210 |
#endif // #ifdef ASSERT |
211 |
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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 |
1 | 215 |
private: |
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#endif |
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}; |
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// 'Blocks' allow shorter sections of the bitmap to be searched. Each Block |
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// holds an offset, which is the amount of live data in the Region to the left |
1 | 221 |
// of the first live object in the Block. This amount of live data will |
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// include any object extending into the block. The first block in |
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// a region does not include any partial object extending into the |
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// the region. |
1 | 225 |
// |
226 |
// The offset also encodes the |
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// 'parity' of the first 1 bit in the Block: a positive offset means the |
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// first 1 bit marks the start of an object, a negative offset means the first |
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// 1 bit marks the end of an object. |
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class BlockData |
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{ |
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public: |
1 | 233 |
typedef short int blk_ofs_t; |
234 |
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blk_ofs_t offset() const { return _offset >= 0 ? _offset : -_offset; } |
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blk_ofs_t raw_offset() const { return _offset; } |
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void set_first_is_start_bit(bool v) { _first_is_start_bit = v; } |
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#if 0 |
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// The need for this method was anticipated but it is |
|
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// never actually used. Do not include it for now. If |
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// it is needed, consider the problem of what is passed |
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// as "v". To avoid warning errors the method set_start_bit_offset() |
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// was changed to take a size_t as the parameter and to do the |
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// check for the possible overflow. Doing the cast in these |
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// methods better limits the potential problems because of |
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// the size of the field to this class. |
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void set_raw_offset(blk_ofs_t v) { _offset = v; } |
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#endif |
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250 |
void set_start_bit_offset(size_t val) { |
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assert(val >= 0, "sanity"); |
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_offset = (blk_ofs_t) val; |
|
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assert(val == (size_t) _offset, "Value is too large"); |
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_first_is_start_bit = true; |
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} |
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void set_end_bit_offset(size_t val) { |
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assert(val >= 0, "sanity"); |
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_offset = (blk_ofs_t) val; |
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assert(val == (size_t) _offset, "Value is too large"); |
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_offset = - _offset; |
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261 |
_first_is_start_bit = false; |
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} |
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bool first_is_start_bit() { |
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assert(_set_phase > 0, "Not initialized"); |
|
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return _first_is_start_bit; |
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} |
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bool first_is_end_bit() { |
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268 |
assert(_set_phase > 0, "Not initialized"); |
|
269 |
return !_first_is_start_bit; |
|
270 |
} |
|
271 |
||
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private: |
1 | 273 |
blk_ofs_t _offset; |
274 |
// This is temporary until the mark_bitmap is separated into |
|
275 |
// a start bit array and an end bit array. |
|
276 |
bool _first_is_start_bit; |
|
277 |
#ifdef ASSERT |
|
278 |
short _set_phase; |
|
279 |
static short _cur_phase; |
|
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280 |
public: |
1 | 281 |
static void set_cur_phase(short v) { _cur_phase = v; } |
282 |
#endif |
|
283 |
}; |
|
284 |
||
285 |
public: |
|
286 |
ParallelCompactData(); |
|
287 |
bool initialize(MemRegion covered_region); |
|
288 |
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size_t region_count() const { return _region_count; } |
1 | 290 |
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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; |
1 | 294 |
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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); |
1 | 297 |
|
298 |
size_t block_count() const { return _block_count; } |
|
299 |
inline BlockData* block(size_t n) const; |
|
300 |
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301 |
// Returns true if the given block is in the given region. |
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static bool region_contains_block(size_t region_index, size_t block_index); |
1 | 303 |
|
304 |
void add_obj(HeapWord* addr, size_t len); |
|
305 |
void add_obj(oop p, size_t len) { add_obj((HeapWord*)p, len); } |
|
306 |
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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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309 |
// must be region-aligned; end need not be. |
1 | 310 |
void summarize_dense_prefix(HeapWord* beg, HeapWord* end); |
311 |
||
312 |
bool summarize(HeapWord* target_beg, HeapWord* target_end, |
|
313 |
HeapWord* source_beg, HeapWord* source_end, |
|
314 |
HeapWord** target_next, HeapWord** source_next = 0); |
|
315 |
||
316 |
void clear(); |
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317 |
void clear_range(size_t beg_region, size_t end_region); |
1 | 318 |
void clear_range(HeapWord* beg, HeapWord* end) { |
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319 |
clear_range(addr_to_region_idx(beg), addr_to_region_idx(end)); |
1 | 320 |
} |
321 |
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// Return the number of words between addr and the start of the region |
1 | 323 |
// containing addr. |
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inline size_t region_offset(const HeapWord* addr) const; |
1 | 325 |
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326 |
// Convert addresses to/from a region index or region pointer. |
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327 |
inline size_t addr_to_region_idx(const HeapWord* addr) const; |
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328 |
inline RegionData* addr_to_region_ptr(const HeapWord* addr) const; |
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329 |
inline HeapWord* region_to_addr(size_t region) const; |
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330 |
inline HeapWord* region_to_addr(size_t region, size_t offset) const; |
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331 |
inline HeapWord* region_to_addr(const RegionData* region) const; |
1 | 332 |
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333 |
inline HeapWord* region_align_down(HeapWord* addr) const; |
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334 |
inline HeapWord* region_align_up(HeapWord* addr) const; |
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335 |
inline bool is_region_aligned(HeapWord* addr) const; |
1 | 336 |
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337 |
// Analogous to region_offset() for blocks. |
1 | 338 |
size_t block_offset(const HeapWord* addr) const; |
339 |
size_t addr_to_block_idx(const HeapWord* addr) const; |
|
340 |
size_t addr_to_block_idx(const oop obj) const { |
|
341 |
return addr_to_block_idx((HeapWord*) obj); |
|
342 |
} |
|
343 |
inline BlockData* addr_to_block_ptr(const HeapWord* addr) const; |
|
344 |
inline HeapWord* block_to_addr(size_t block) const; |
|
345 |
||
346 |
// Return the address one past the end of the partial object. |
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HeapWord* partial_obj_end(size_t region_idx) const; |
1 | 348 |
|
349 |
// Return the new location of the object p after the |
|
350 |
// the compaction. |
|
351 |
HeapWord* calc_new_pointer(HeapWord* addr); |
|
352 |
||
353 |
// Same as calc_new_pointer() using blocks. |
|
354 |
HeapWord* block_calc_new_pointer(HeapWord* addr); |
|
355 |
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356 |
// Same as calc_new_pointer() using regions. |
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357 |
HeapWord* region_calc_new_pointer(HeapWord* addr); |
1 | 358 |
|
359 |
HeapWord* calc_new_pointer(oop p) { |
|
360 |
return calc_new_pointer((HeapWord*) p); |
|
361 |
} |
|
362 |
||
363 |
// Return the updated address for the given klass |
|
364 |
klassOop calc_new_klass(klassOop); |
|
365 |
||
366 |
// Given a block returns true if the partial object for the |
|
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367 |
// corresponding region ends in the block. Returns false, otherwise |
1 | 368 |
// If there is no partial object, returns false. |
369 |
bool partial_obj_ends_in_block(size_t block_index); |
|
370 |
||
371 |
// Returns the block index for the block |
|
372 |
static size_t block_idx(BlockData* block); |
|
373 |
||
374 |
#ifdef ASSERT |
|
375 |
void verify_clear(const PSVirtualSpace* vspace); |
|
376 |
void verify_clear(); |
|
377 |
#endif // #ifdef ASSERT |
|
378 |
||
379 |
private: |
|
380 |
bool initialize_block_data(size_t region_size); |
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381 |
bool initialize_region_data(size_t region_size); |
1 | 382 |
PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
383 |
||
384 |
private: |
|
385 |
HeapWord* _region_start; |
|
386 |
#ifdef ASSERT |
|
387 |
HeapWord* _region_end; |
|
388 |
#endif // #ifdef ASSERT |
|
389 |
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|
390 |
PSVirtualSpace* _region_vspace; |
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|
391 |
RegionData* _region_data; |
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|
392 |
size_t _region_count; |
1 | 393 |
|
394 |
PSVirtualSpace* _block_vspace; |
|
395 |
BlockData* _block_data; |
|
396 |
size_t _block_count; |
|
397 |
}; |
|
398 |
||
399 |
inline uint |
|
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|
400 |
ParallelCompactData::RegionData::destination_count_raw() const |
1 | 401 |
{ |
402 |
return _dc_and_los & dc_mask; |
|
403 |
} |
|
404 |
||
405 |
inline uint |
|
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|
406 |
ParallelCompactData::RegionData::destination_count() const |
1 | 407 |
{ |
408 |
return destination_count_raw() >> dc_shift; |
|
409 |
} |
|
410 |
||
411 |
inline void |
|
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|
412 |
ParallelCompactData::RegionData::set_destination_count(uint count) |
1 | 413 |
{ |
414 |
assert(count <= (dc_completed >> dc_shift), "count too large"); |
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|
415 |
const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
1 | 416 |
_dc_and_los = (count << dc_shift) | live_sz; |
417 |
} |
|
418 |
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|
419 |
inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
1 | 420 |
{ |
421 |
assert(words <= los_mask, "would overflow"); |
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|
422 |
_dc_and_los = destination_count_raw() | (region_sz_t)words; |
1 | 423 |
} |
424 |
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|
425 |
inline void ParallelCompactData::RegionData::decrement_destination_count() |
1 | 426 |
{ |
427 |
assert(_dc_and_los < dc_claimed, "already claimed"); |
|
428 |
assert(_dc_and_los >= dc_one, "count would go negative"); |
|
429 |
Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); |
|
430 |
} |
|
431 |
||
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|
432 |
inline HeapWord* ParallelCompactData::RegionData::data_location() const |
1 | 433 |
{ |
434 |
DEBUG_ONLY(return _data_location;) |
|
435 |
NOT_DEBUG(return NULL;) |
|
436 |
} |
|
437 |
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|
438 |
inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
1 | 439 |
{ |
440 |
DEBUG_ONLY(return _highest_ref;) |
|
441 |
NOT_DEBUG(return NULL;) |
|
442 |
} |
|
443 |
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|
444 |
inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
1 | 445 |
{ |
446 |
DEBUG_ONLY(_data_location = addr;) |
|
447 |
} |
|
448 |
||
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|
449 |
inline void ParallelCompactData::RegionData::set_completed() |
1 | 450 |
{ |
451 |
assert(claimed(), "must be claimed first"); |
|
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|
452 |
_dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
1 | 453 |
} |
454 |
||
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|
455 |
// MT-unsafe claiming of a region. Should only be used during single threaded |
1 | 456 |
// execution. |
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|
457 |
inline bool ParallelCompactData::RegionData::claim_unsafe() |
1 | 458 |
{ |
459 |
if (available()) { |
|
460 |
_dc_and_los |= dc_claimed; |
|
461 |
return true; |
|
462 |
} |
|
463 |
return false; |
|
464 |
} |
|
465 |
||
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|
466 |
inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
1 | 467 |
{ |
468 |
assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); |
|
469 |
Atomic::add((int) words, (volatile int*) &_dc_and_los); |
|
470 |
} |
|
471 |
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|
472 |
inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
1 | 473 |
{ |
474 |
#ifdef ASSERT |
|
475 |
HeapWord* tmp = _highest_ref; |
|
476 |
while (addr > tmp) { |
|
477 |
tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); |
|
478 |
} |
|
479 |
#endif // #ifdef ASSERT |
|
480 |
} |
|
481 |
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|
482 |
inline bool ParallelCompactData::RegionData::claim() |
1 | 483 |
{ |
484 |
const int los = (int) live_obj_size(); |
|
485 |
const int old = Atomic::cmpxchg(dc_claimed | los, |
|
486 |
(volatile int*) &_dc_and_los, los); |
|
487 |
return old == los; |
|
488 |
} |
|
489 |
||
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|
490 |
inline ParallelCompactData::RegionData* |
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|
491 |
ParallelCompactData::region(size_t region_idx) const |
1 | 492 |
{ |
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|
493 |
assert(region_idx <= region_count(), "bad arg"); |
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|
494 |
return _region_data + region_idx; |
1 | 495 |
} |
496 |
||
497 |
inline size_t |
|
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|
498 |
ParallelCompactData::region(const RegionData* const region_ptr) const |
1 | 499 |
{ |
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|
500 |
assert(region_ptr >= _region_data, "bad arg"); |
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|
501 |
assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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|
502 |
return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
1 | 503 |
} |
504 |
||
505 |
inline ParallelCompactData::BlockData* |
|
506 |
ParallelCompactData::block(size_t n) const { |
|
507 |
assert(n < block_count(), "bad arg"); |
|
508 |
return _block_data + n; |
|
509 |
} |
|
510 |
||
511 |
inline size_t |
|
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|
512 |
ParallelCompactData::region_offset(const HeapWord* addr) const |
1 | 513 |
{ |
514 |
assert(addr >= _region_start, "bad addr"); |
|
515 |
assert(addr <= _region_end, "bad addr"); |
|
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|
516 |
return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
1 | 517 |
} |
518 |
||
519 |
inline size_t |
|
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|
520 |
ParallelCompactData::addr_to_region_idx(const HeapWord* addr) const |
1 | 521 |
{ |
522 |
assert(addr >= _region_start, "bad addr"); |
|
523 |
assert(addr <= _region_end, "bad addr"); |
|
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|
524 |
return pointer_delta(addr, _region_start) >> Log2RegionSize; |
1 | 525 |
} |
526 |
||
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|
527 |
inline ParallelCompactData::RegionData* |
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|
528 |
ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
1 | 529 |
{ |
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|
530 |
return region(addr_to_region_idx(addr)); |
1 | 531 |
} |
532 |
||
533 |
inline HeapWord* |
|
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|
534 |
ParallelCompactData::region_to_addr(size_t region) const |
1 | 535 |
{ |
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|
536 |
assert(region <= _region_count, "region out of range"); |
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|
537 |
return _region_start + (region << Log2RegionSize); |
1 | 538 |
} |
539 |
||
540 |
inline HeapWord* |
|
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|
541 |
ParallelCompactData::region_to_addr(const RegionData* region) const |
1 | 542 |
{ |
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|
543 |
return region_to_addr(pointer_delta(region, _region_data, |
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changeset
|
544 |
sizeof(RegionData))); |
1 | 545 |
} |
546 |
||
547 |
inline HeapWord* |
|
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|
548 |
ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
1 | 549 |
{ |
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|
550 |
assert(region <= _region_count, "region out of range"); |
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|
551 |
assert(offset < RegionSize, "offset too big"); // This may be too strict. |
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|
552 |
return region_to_addr(region) + offset; |
1 | 553 |
} |
554 |
||
555 |
inline HeapWord* |
|
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|
556 |
ParallelCompactData::region_align_down(HeapWord* addr) const |
1 | 557 |
{ |
558 |
assert(addr >= _region_start, "bad addr"); |
|
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|
559 |
assert(addr < _region_end + RegionSize, "bad addr"); |
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|
560 |
return (HeapWord*)(size_t(addr) & RegionAddrMask); |
1 | 561 |
} |
562 |
||
563 |
inline HeapWord* |
|
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|
564 |
ParallelCompactData::region_align_up(HeapWord* addr) const |
1 | 565 |
{ |
566 |
assert(addr >= _region_start, "bad addr"); |
|
567 |
assert(addr <= _region_end, "bad addr"); |
|
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|
568 |
return region_align_down(addr + RegionSizeOffsetMask); |
1 | 569 |
} |
570 |
||
571 |
inline bool |
|
1407
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|
572 |
ParallelCompactData::is_region_aligned(HeapWord* addr) const |
1 | 573 |
{ |
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|
574 |
return region_offset(addr) == 0; |
1 | 575 |
} |
576 |
||
577 |
inline size_t |
|
578 |
ParallelCompactData::block_offset(const HeapWord* addr) const |
|
579 |
{ |
|
580 |
assert(addr >= _region_start, "bad addr"); |
|
581 |
assert(addr <= _region_end, "bad addr"); |
|
582 |
return pointer_delta(addr, _region_start) & BlockOffsetMask; |
|
583 |
} |
|
584 |
||
585 |
inline size_t |
|
586 |
ParallelCompactData::addr_to_block_idx(const HeapWord* addr) const |
|
587 |
{ |
|
588 |
assert(addr >= _region_start, "bad addr"); |
|
589 |
assert(addr <= _region_end, "bad addr"); |
|
590 |
return pointer_delta(addr, _region_start) >> Log2BlockSize; |
|
591 |
} |
|
592 |
||
593 |
inline ParallelCompactData::BlockData* |
|
594 |
ParallelCompactData::addr_to_block_ptr(const HeapWord* addr) const |
|
595 |
{ |
|
596 |
return block(addr_to_block_idx(addr)); |
|
597 |
} |
|
598 |
||
599 |
inline HeapWord* |
|
600 |
ParallelCompactData::block_to_addr(size_t block) const |
|
601 |
{ |
|
602 |
assert(block < _block_count, "block out of range"); |
|
603 |
return _region_start + (block << Log2BlockSize); |
|
604 |
} |
|
605 |
||
606 |
// Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the |
|
607 |
// do_addr() method. |
|
608 |
// |
|
609 |
// The closure is initialized with the number of heap words to process |
|
610 |
// (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() |
|
611 |
// methods in subclasses should update the total as words are processed. Since |
|
612 |
// only one subclass actually uses this mechanism to terminate iteration, the |
|
613 |
// default initial value is > 0. The implementation is here and not in the |
|
614 |
// single subclass that uses it to avoid making is_full() virtual, and thus |
|
615 |
// adding a virtual call per live object. |
|
616 |
||
617 |
class ParMarkBitMapClosure: public StackObj { |
|
618 |
public: |
|
619 |
typedef ParMarkBitMap::idx_t idx_t; |
|
620 |
typedef ParMarkBitMap::IterationStatus IterationStatus; |
|
621 |
||
622 |
public: |
|
623 |
inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, |
|
624 |
size_t words = max_uintx); |
|
625 |
||
626 |
inline ParCompactionManager* compaction_manager() const; |
|
627 |
inline ParMarkBitMap* bitmap() const; |
|
628 |
inline size_t words_remaining() const; |
|
629 |
inline bool is_full() const; |
|
630 |
inline HeapWord* source() const; |
|
631 |
||
632 |
inline void set_source(HeapWord* addr); |
|
633 |
||
634 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; |
|
635 |
||
636 |
protected: |
|
637 |
inline void decrement_words_remaining(size_t words); |
|
638 |
||
639 |
private: |
|
640 |
ParMarkBitMap* const _bitmap; |
|
641 |
ParCompactionManager* const _compaction_manager; |
|
642 |
DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. |
|
643 |
size_t _words_remaining; // Words left to copy. |
|
644 |
||
645 |
protected: |
|
646 |
HeapWord* _source; // Next addr that would be read. |
|
647 |
}; |
|
648 |
||
649 |
inline |
|
650 |
ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, |
|
651 |
ParCompactionManager* cm, |
|
652 |
size_t words): |
|
653 |
_bitmap(bitmap), _compaction_manager(cm) |
|
654 |
#ifdef ASSERT |
|
655 |
, _initial_words_remaining(words) |
|
656 |
#endif |
|
657 |
{ |
|
658 |
_words_remaining = words; |
|
659 |
_source = NULL; |
|
660 |
} |
|
661 |
||
662 |
inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { |
|
663 |
return _compaction_manager; |
|
664 |
} |
|
665 |
||
666 |
inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { |
|
667 |
return _bitmap; |
|
668 |
} |
|
669 |
||
670 |
inline size_t ParMarkBitMapClosure::words_remaining() const { |
|
671 |
return _words_remaining; |
|
672 |
} |
|
673 |
||
674 |
inline bool ParMarkBitMapClosure::is_full() const { |
|
675 |
return words_remaining() == 0; |
|
676 |
} |
|
677 |
||
678 |
inline HeapWord* ParMarkBitMapClosure::source() const { |
|
679 |
return _source; |
|
680 |
} |
|
681 |
||
682 |
inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { |
|
683 |
_source = addr; |
|
684 |
} |
|
685 |
||
686 |
inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { |
|
687 |
assert(_words_remaining >= words, "processed too many words"); |
|
688 |
_words_remaining -= words; |
|
689 |
} |
|
690 |
||
691 |
// Closure for updating the block data during the summary phase. |
|
692 |
class BitBlockUpdateClosure: public ParMarkBitMapClosure { |
|
693 |
// ParallelCompactData::BlockData::blk_ofs_t _live_data_left; |
|
694 |
size_t _live_data_left; |
|
695 |
size_t _cur_block; |
|
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|
696 |
HeapWord* _region_start; |
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diff
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|
697 |
HeapWord* _region_end; |
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diff
changeset
|
698 |
size_t _region_index; |
1 | 699 |
|
700 |
public: |
|
701 |
BitBlockUpdateClosure(ParMarkBitMap* mbm, |
|
702 |
ParCompactionManager* cm, |
|
1407
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diff
changeset
|
703 |
size_t region_index); |
1 | 704 |
|
705 |
size_t cur_block() { return _cur_block; } |
|
1407
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977
diff
changeset
|
706 |
size_t region_index() { return _region_index; } |
1 | 707 |
size_t live_data_left() { return _live_data_left; } |
708 |
// Returns true the first bit in the current block (cur_block) is |
|
709 |
// a start bit. |
|
1407
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977
diff
changeset
|
710 |
// Returns true if the current block is within the region for the closure; |
9006b01ba3fd
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977
diff
changeset
|
711 |
bool region_contains_cur_block(); |
1 | 712 |
|
1407
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parents:
977
diff
changeset
|
713 |
// Set the region index and related region values for |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
714 |
// a new region. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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977
diff
changeset
|
715 |
void reset_region(size_t region_index); |
1 | 716 |
|
717 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words); |
|
718 |
}; |
|
719 |
||
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
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977
diff
changeset
|
720 |
// The UseParallelOldGC collector is a stop-the-world garbage collector that |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
721 |
// does parts of the collection using parallel threads. The collection includes |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
722 |
// the tenured generation and the young generation. The permanent generation is |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
723 |
// collected at the same time as the other two generations but the permanent |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
724 |
// generation is collect by a single GC thread. The permanent generation is |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
725 |
// collected serially because of the requirement that during the processing of a |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
726 |
// klass AAA, any objects reference by AAA must already have been processed. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
727 |
// This requirement is enforced by a left (lower address) to right (higher |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
728 |
// address) sliding compaction. |
971
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360
diff
changeset
|
729 |
// |
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diff
changeset
|
730 |
// There are four phases of the collection. |
f0b20be4165d
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360
diff
changeset
|
731 |
// |
f0b20be4165d
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diff
changeset
|
732 |
// - marking phase |
f0b20be4165d
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360
diff
changeset
|
733 |
// - summary phase |
f0b20be4165d
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diff
changeset
|
734 |
// - compacting phase |
f0b20be4165d
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360
diff
changeset
|
735 |
// - clean up phase |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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360
diff
changeset
|
736 |
// |
f0b20be4165d
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360
diff
changeset
|
737 |
// Roughly speaking these phases correspond, respectively, to |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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360
diff
changeset
|
738 |
// - mark all the live objects |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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360
diff
changeset
|
739 |
// - calculate the destination of each object at the end of the collection |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
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360
diff
changeset
|
740 |
// - move the objects to their destination |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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360
diff
changeset
|
741 |
// - update some references and reinitialize some variables |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
742 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
743 |
// These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
744 |
// marking phase is implemented in PSParallelCompact::marking_phase() and does a |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
745 |
// complete marking of the heap. The summary phase is implemented in |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
746 |
// PSParallelCompact::summary_phase(). The move and update phase is implemented |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
747 |
// in PSParallelCompact::compact(). |
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
748 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
749 |
// A space that is being collected is divided into regions and with each region |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
750 |
// is associated an object of type ParallelCompactData. Each region is of a |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
751 |
// fixed size and typically will contain more than 1 object and may have parts |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
752 |
// of objects at the front and back of the region. |
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
753 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
754 |
// region -----+---------------------+---------- |
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
755 |
// objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
756 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
757 |
// The marking phase does a complete marking of all live objects in the heap. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
758 |
// The marking also compiles the size of the data for all live objects covered |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
759 |
// by the region. This size includes the part of any live object spanning onto |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
760 |
// the region (part of AAA if it is live) from the front, all live objects |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
761 |
// contained in the region (BBB and/or CCC if they are live), and the part of |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
762 |
// any live objects covered by the region that extends off the region (part of |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
763 |
// DDD if it is live). The marking phase uses multiple GC threads and marking |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
764 |
// is done in a bit array of type ParMarkBitMap. The marking of the bit map is |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
765 |
// done atomically as is the accumulation of the size of the live objects |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
766 |
// covered by a region. |
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
767 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
768 |
// The summary phase calculates the total live data to the left of each region |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
769 |
// XXX. Based on that total and the bottom of the space, it can calculate the |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
770 |
// starting location of the live data in XXX. The summary phase calculates for |
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|
771 |
// each region XXX quantites such as |
971
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|
772 |
// |
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|
773 |
// - the amount of live data at the beginning of a region from an object |
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|
774 |
// entering the region. |
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|
775 |
// - the location of the first live data on the region |
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|
776 |
// - a count of the number of regions receiving live data from XXX. |
971
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|
777 |
// |
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|
778 |
// See ParallelCompactData for precise details. The summary phase also |
1407
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|
779 |
// calculates the dense prefix for the compaction. The dense prefix is a |
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|
780 |
// portion at the beginning of the space that is not moved. The objects in the |
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|
781 |
// dense prefix do need to have their object references updated. See method |
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|
782 |
// summarize_dense_prefix(). |
971
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|
783 |
// |
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|
784 |
// The summary phase is done using 1 GC thread. |
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|
785 |
// |
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|
786 |
// The compaction phase moves objects to their new location and updates all |
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|
787 |
// references in the object. |
971
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|
788 |
// |
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|
789 |
// A current exception is that objects that cross a region boundary are moved |
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|
790 |
// but do not have their references updated. References are not updated because |
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|
791 |
// it cannot easily be determined if the klass pointer KKK for the object AAA |
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|
792 |
// has been updated. KKK likely resides in a region to the left of the region |
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|
793 |
// containing AAA. These AAA's have there references updated at the end in a |
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|
794 |
// clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
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|
795 |
// An alternate strategy is being investigated for this deferral of updating. |
971
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|
796 |
// |
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|
797 |
// Compaction is done on a region basis. A region that is ready to be filled is |
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|
798 |
// put on a ready list and GC threads take region off the list and fill them. A |
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|
799 |
// region is ready to be filled if it empty of live objects. Such a region may |
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|
800 |
// have been initially empty (only contained dead objects) or may have had all |
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|
801 |
// its live objects copied out already. A region that compacts into itself is |
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|
802 |
// also ready for filling. The ready list is initially filled with empty |
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changeset
|
803 |
// regions and regions compacting into themselves. There is always at least 1 |
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changeset
|
804 |
// region that can be put on the ready list. The regions are atomically added |
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changeset
|
805 |
// and removed from the ready list. |
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|
806 |
|
1 | 807 |
class PSParallelCompact : AllStatic { |
808 |
public: |
|
809 |
// Convenient access to type names. |
|
810 |
typedef ParMarkBitMap::idx_t idx_t; |
|
1407
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|
811 |
typedef ParallelCompactData::RegionData RegionData; |
1 | 812 |
typedef ParallelCompactData::BlockData BlockData; |
813 |
||
814 |
typedef enum { |
|
815 |
perm_space_id, old_space_id, eden_space_id, |
|
816 |
from_space_id, to_space_id, last_space_id |
|
817 |
} SpaceId; |
|
818 |
||
819 |
public: |
|
360
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|
820 |
// Inline closure decls |
1 | 821 |
// |
822 |
class IsAliveClosure: public BoolObjectClosure { |
|
823 |
public: |
|
360
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|
824 |
virtual void do_object(oop p); |
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|
825 |
virtual bool do_object_b(oop p); |
1 | 826 |
}; |
827 |
||
828 |
class KeepAliveClosure: public OopClosure { |
|
360
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|
829 |
private: |
1 | 830 |
ParCompactionManager* _compaction_manager; |
360
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|
831 |
protected: |
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changeset
|
832 |
template <class T> inline void do_oop_work(T* p); |
1 | 833 |
public: |
360
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|
834 |
KeepAliveClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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|
835 |
virtual void do_oop(oop* p); |
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|
836 |
virtual void do_oop(narrowOop* p); |
1 | 837 |
}; |
838 |
||
360
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|
839 |
// Current unused |
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|
840 |
class FollowRootClosure: public OopsInGenClosure { |
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|
841 |
private: |
1 | 842 |
ParCompactionManager* _compaction_manager; |
843 |
public: |
|
360
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|
844 |
FollowRootClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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|
845 |
virtual void do_oop(oop* p); |
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|
846 |
virtual void do_oop(narrowOop* p); |
1 | 847 |
virtual const bool do_nmethods() const { return true; } |
848 |
}; |
|
849 |
||
850 |
class FollowStackClosure: public VoidClosure { |
|
360
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|
851 |
private: |
1 | 852 |
ParCompactionManager* _compaction_manager; |
853 |
public: |
|
360
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|
854 |
FollowStackClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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|
855 |
virtual void do_void(); |
1 | 856 |
}; |
857 |
||
858 |
class AdjustPointerClosure: public OopsInGenClosure { |
|
360
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|
859 |
private: |
1 | 860 |
bool _is_root; |
861 |
public: |
|
360
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|
862 |
AdjustPointerClosure(bool is_root) : _is_root(is_root) { } |
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|
863 |
virtual void do_oop(oop* p); |
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|
864 |
virtual void do_oop(narrowOop* p); |
1 | 865 |
}; |
866 |
||
867 |
// Closure for verifying update of pointers. Does not |
|
868 |
// have any side effects. |
|
869 |
class VerifyUpdateClosure: public ParMarkBitMapClosure { |
|
870 |
const MutableSpace* _space; // Is this ever used? |
|
871 |
||
872 |
public: |
|
873 |
VerifyUpdateClosure(ParCompactionManager* cm, const MutableSpace* sp) : |
|
874 |
ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), _space(sp) |
|
875 |
{ } |
|
876 |
||
877 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words); |
|
878 |
||
879 |
const MutableSpace* space() { return _space; } |
|
880 |
}; |
|
881 |
||
882 |
// Closure for updating objects altered for debug checking |
|
883 |
class ResetObjectsClosure: public ParMarkBitMapClosure { |
|
884 |
public: |
|
885 |
ResetObjectsClosure(ParCompactionManager* cm): |
|
886 |
ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm) |
|
887 |
{ } |
|
888 |
||
889 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words); |
|
890 |
}; |
|
891 |
||
892 |
friend class KeepAliveClosure; |
|
893 |
friend class FollowStackClosure; |
|
894 |
friend class AdjustPointerClosure; |
|
895 |
friend class FollowRootClosure; |
|
896 |
friend class instanceKlassKlass; |
|
897 |
friend class RefProcTaskProxy; |
|
898 |
||
899 |
private: |
|
900 |
static elapsedTimer _accumulated_time; |
|
901 |
static unsigned int _total_invocations; |
|
902 |
static unsigned int _maximum_compaction_gc_num; |
|
903 |
static jlong _time_of_last_gc; // ms |
|
904 |
static CollectorCounters* _counters; |
|
905 |
static ParMarkBitMap _mark_bitmap; |
|
906 |
static ParallelCompactData _summary_data; |
|
907 |
static IsAliveClosure _is_alive_closure; |
|
908 |
static SpaceInfo _space_info[last_space_id]; |
|
909 |
static bool _print_phases; |
|
910 |
static AdjustPointerClosure _adjust_root_pointer_closure; |
|
911 |
static AdjustPointerClosure _adjust_pointer_closure; |
|
912 |
||
913 |
// Reference processing (used in ...follow_contents) |
|
914 |
static ReferenceProcessor* _ref_processor; |
|
915 |
||
916 |
// Updated location of intArrayKlassObj. |
|
917 |
static klassOop _updated_int_array_klass_obj; |
|
918 |
||
919 |
// Values computed at initialization and used by dead_wood_limiter(). |
|
920 |
static double _dwl_mean; |
|
921 |
static double _dwl_std_dev; |
|
922 |
static double _dwl_first_term; |
|
923 |
static double _dwl_adjustment; |
|
924 |
#ifdef ASSERT |
|
925 |
static bool _dwl_initialized; |
|
926 |
#endif // #ifdef ASSERT |
|
927 |
||
928 |
private: |
|
929 |
// Closure accessors |
|
360
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|
930 |
static OopClosure* adjust_pointer_closure() { return (OopClosure*)&_adjust_pointer_closure; } |
1 | 931 |
static OopClosure* adjust_root_pointer_closure() { return (OopClosure*)&_adjust_root_pointer_closure; } |
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|
932 |
static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
1 | 933 |
|
934 |
static void initialize_space_info(); |
|
935 |
||
936 |
// Return true if details about individual phases should be printed. |
|
937 |
static inline bool print_phases(); |
|
938 |
||
939 |
// Clear the marking bitmap and summary data that cover the specified space. |
|
940 |
static void clear_data_covering_space(SpaceId id); |
|
941 |
||
942 |
static void pre_compact(PreGCValues* pre_gc_values); |
|
943 |
static void post_compact(); |
|
944 |
||
945 |
// Mark live objects |
|
946 |
static void marking_phase(ParCompactionManager* cm, |
|
947 |
bool maximum_heap_compaction); |
|
948 |
static void follow_stack(ParCompactionManager* cm); |
|
949 |
static void follow_weak_klass_links(ParCompactionManager* cm); |
|
950 |
||
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|
951 |
template <class T> static inline void adjust_pointer(T* p, bool is_root); |
1 | 952 |
static void adjust_root_pointer(oop* p) { adjust_pointer(p, true); } |
953 |
||
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|
954 |
template <class T> |
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|
955 |
static inline void follow_root(ParCompactionManager* cm, T* p); |
1 | 956 |
|
957 |
// Compute the dense prefix for the designated space. This is an experimental |
|
958 |
// implementation currently not used in production. |
|
959 |
static HeapWord* compute_dense_prefix_via_density(const SpaceId id, |
|
960 |
bool maximum_compaction); |
|
961 |
||
962 |
// Methods used to compute the dense prefix. |
|
963 |
||
964 |
// Compute the value of the normal distribution at x = density. The mean and |
|
965 |
// standard deviation are values saved by initialize_dead_wood_limiter(). |
|
966 |
static inline double normal_distribution(double density); |
|
967 |
||
968 |
// Initialize the static vars used by dead_wood_limiter(). |
|
969 |
static void initialize_dead_wood_limiter(); |
|
970 |
||
971 |
// Return the percentage of space that can be treated as "dead wood" (i.e., |
|
972 |
// not reclaimed). |
|
973 |
static double dead_wood_limiter(double density, size_t min_percent); |
|
974 |
||
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|
975 |
// Find the first (left-most) region in the range [beg, end) that has at least |
1 | 976 |
// dead_words of dead space to the left. The argument beg must be the first |
1407
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|
977 |
// region in the space that is not completely live. |
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|
978 |
static RegionData* dead_wood_limit_region(const RegionData* beg, |
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|
979 |
const RegionData* end, |
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changeset
|
980 |
size_t dead_words); |
1 | 981 |
|
1407
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|
982 |
// Return a pointer to the first region in the range [beg, end) that is not |
1 | 983 |
// completely full. |
1407
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|
984 |
static RegionData* first_dead_space_region(const RegionData* beg, |
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|
985 |
const RegionData* end); |
1 | 986 |
|
987 |
// Return a value indicating the benefit or 'yield' if the compacted region |
|
988 |
// were to start (or equivalently if the dense prefix were to end) at the |
|
1407
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|
989 |
// candidate region. Higher values are better. |
1 | 990 |
// |
991 |
// The value is based on the amount of space reclaimed vs. the costs of (a) |
|
992 |
// updating references in the dense prefix plus (b) copying objects and |
|
993 |
// updating references in the compacted region. |
|
1407
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|
994 |
static inline double reclaimed_ratio(const RegionData* const candidate, |
1 | 995 |
HeapWord* const bottom, |
996 |
HeapWord* const top, |
|
997 |
HeapWord* const new_top); |
|
998 |
||
999 |
// Compute the dense prefix for the designated space. |
|
1000 |
static HeapWord* compute_dense_prefix(const SpaceId id, |
|
1001 |
bool maximum_compaction); |
|
1002 |
||
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|
1003 |
// Return true if dead space crosses onto the specified Region; bit must be |
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|
1004 |
// the bit index corresponding to the first word of the Region. |
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|
1005 |
static inline bool dead_space_crosses_boundary(const RegionData* region, |
1 | 1006 |
idx_t bit); |
1007 |
||
1008 |
// Summary phase utility routine to fill dead space (if any) at the dense |
|
1009 |
// prefix boundary. Should only be called if the the dense prefix is |
|
1010 |
// non-empty. |
|
1011 |
static void fill_dense_prefix_end(SpaceId id); |
|
1012 |
||
1013 |
static void summarize_spaces_quick(); |
|
1014 |
static void summarize_space(SpaceId id, bool maximum_compaction); |
|
1015 |
static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); |
|
1016 |
||
1017 |
static bool block_first_offset(size_t block_index, idx_t* block_offset_ptr); |
|
1018 |
||
1019 |
// Fill in the BlockData |
|
1020 |
static void summarize_blocks(ParCompactionManager* cm, |
|
1021 |
SpaceId first_compaction_space_id); |
|
1022 |
||
1023 |
// The space that is compacted after space_id. |
|
1024 |
static SpaceId next_compaction_space_id(SpaceId space_id); |
|
1025 |
||
1026 |
// Adjust addresses in roots. Does not adjust addresses in heap. |
|
1027 |
static void adjust_roots(); |
|
1028 |
||
1029 |
// Serial code executed in preparation for the compaction phase. |
|
1030 |
static void compact_prologue(); |
|
1031 |
||
1032 |
// Move objects to new locations. |
|
1033 |
static void compact_perm(ParCompactionManager* cm); |
|
1034 |
static void compact(); |
|
1035 |
||
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|
1036 |
// Add available regions to the stack and draining tasks to the task queue. |
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|
1037 |
static void enqueue_region_draining_tasks(GCTaskQueue* q, |
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|
1038 |
uint parallel_gc_threads); |
1 | 1039 |
|
1040 |
// Add dense prefix update tasks to the task queue. |
|
1041 |
static void enqueue_dense_prefix_tasks(GCTaskQueue* q, |
|
1042 |
uint parallel_gc_threads); |
|
1043 |
||
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|
1044 |
// Add region stealing tasks to the task queue. |
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|
1045 |
static void enqueue_region_stealing_tasks( |
1 | 1046 |
GCTaskQueue* q, |
1047 |
ParallelTaskTerminator* terminator_ptr, |
|
1048 |
uint parallel_gc_threads); |
|
1049 |
||
1050 |
// For debugging only - compacts the old gen serially |
|
1051 |
static void compact_serial(ParCompactionManager* cm); |
|
1052 |
||
1053 |
// If objects are left in eden after a collection, try to move the boundary |
|
1054 |
// and absorb them into the old gen. Returns true if eden was emptied. |
|
1055 |
static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, |
|
1056 |
PSYoungGen* young_gen, |
|
1057 |
PSOldGen* old_gen); |
|
1058 |
||
1059 |
// Reset time since last full gc |
|
1060 |
static void reset_millis_since_last_gc(); |
|
1061 |
||
1062 |
protected: |
|
1063 |
#ifdef VALIDATE_MARK_SWEEP |
|
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|
1064 |
static GrowableArray<void*>* _root_refs_stack; |
1 | 1065 |
static GrowableArray<oop> * _live_oops; |
1066 |
static GrowableArray<oop> * _live_oops_moved_to; |
|
1067 |
static GrowableArray<size_t>* _live_oops_size; |
|
1068 |
static size_t _live_oops_index; |
|
1069 |
static size_t _live_oops_index_at_perm; |
|
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|
1070 |
static GrowableArray<void*>* _other_refs_stack; |
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|
1071 |
static GrowableArray<void*>* _adjusted_pointers; |
1 | 1072 |
static bool _pointer_tracking; |
1073 |
static bool _root_tracking; |
|
1074 |
||
1075 |
// The following arrays are saved since the time of the last GC and |
|
1076 |
// assist in tracking down problems where someone has done an errant |
|
1077 |
// store into the heap, usually to an oop that wasn't properly |
|
1078 |
// handleized across a GC. If we crash or otherwise fail before the |
|
1079 |
// next GC, we can query these arrays to find out the object we had |
|
1080 |
// intended to do the store to (assuming it is still alive) and the |
|
1081 |
// offset within that object. Covered under RecordMarkSweepCompaction. |
|
1082 |
static GrowableArray<HeapWord*> * _cur_gc_live_oops; |
|
1083 |
static GrowableArray<HeapWord*> * _cur_gc_live_oops_moved_to; |
|
1084 |
static GrowableArray<size_t>* _cur_gc_live_oops_size; |
|
1085 |
static GrowableArray<HeapWord*> * _last_gc_live_oops; |
|
1086 |
static GrowableArray<HeapWord*> * _last_gc_live_oops_moved_to; |
|
1087 |
static GrowableArray<size_t>* _last_gc_live_oops_size; |
|
1088 |
#endif |
|
1089 |
||
1090 |
public: |
|
1091 |
class MarkAndPushClosure: public OopClosure { |
|
360
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|
1092 |
private: |
1 | 1093 |
ParCompactionManager* _compaction_manager; |
1094 |
public: |
|
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|
1095 |
MarkAndPushClosure(ParCompactionManager* cm) : _compaction_manager(cm) { } |
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|
1096 |
virtual void do_oop(oop* p); |
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|
1097 |
virtual void do_oop(narrowOop* p); |
1 | 1098 |
virtual const bool do_nmethods() const { return true; } |
1099 |
}; |
|
1100 |
||
1101 |
PSParallelCompact(); |
|
1102 |
||
1103 |
// Convenient accessor for Universe::heap(). |
|
1104 |
static ParallelScavengeHeap* gc_heap() { |
|
1105 |
return (ParallelScavengeHeap*)Universe::heap(); |
|
1106 |
} |
|
1107 |
||
1108 |
static void invoke(bool maximum_heap_compaction); |
|
1109 |
static void invoke_no_policy(bool maximum_heap_compaction); |
|
1110 |
||
1111 |
static void post_initialize(); |
|
1112 |
// Perform initialization for PSParallelCompact that requires |
|
1113 |
// allocations. This should be called during the VM initialization |
|
1114 |
// at a pointer where it would be appropriate to return a JNI_ENOMEM |
|
1115 |
// in the event of a failure. |
|
1116 |
static bool initialize(); |
|
1117 |
||
1118 |
// Public accessors |
|
1119 |
static elapsedTimer* accumulated_time() { return &_accumulated_time; } |
|
1120 |
static unsigned int total_invocations() { return _total_invocations; } |
|
1121 |
static CollectorCounters* counters() { return _counters; } |
|
1122 |
||
1123 |
// Used to add tasks |
|
1124 |
static GCTaskManager* const gc_task_manager(); |
|
1125 |
static klassOop updated_int_array_klass_obj() { |
|
1126 |
return _updated_int_array_klass_obj; |
|
1127 |
} |
|
1128 |
||
1129 |
// Marking support |
|
1130 |
static inline bool mark_obj(oop obj); |
|
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|
1131 |
// Check mark and maybe push on marking stack |
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|
1132 |
template <class T> static inline void mark_and_push(ParCompactionManager* cm, |
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|
1133 |
T* p); |
1 | 1134 |
|
1135 |
// Compaction support. |
|
1136 |
// Return true if p is in the range [beg_addr, end_addr). |
|
1137 |
static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); |
|
1138 |
static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); |
|
1139 |
||
1140 |
// Convenience wrappers for per-space data kept in _space_info. |
|
1141 |
static inline MutableSpace* space(SpaceId space_id); |
|
1142 |
static inline HeapWord* new_top(SpaceId space_id); |
|
1143 |
static inline HeapWord* dense_prefix(SpaceId space_id); |
|
1144 |
static inline ObjectStartArray* start_array(SpaceId space_id); |
|
1145 |
||
1146 |
// Return true if the klass should be updated. |
|
1147 |
static inline bool should_update_klass(klassOop k); |
|
1148 |
||
1149 |
// Move and update the live objects in the specified space. |
|
1150 |
static void move_and_update(ParCompactionManager* cm, SpaceId space_id); |
|
1151 |
||
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|
1152 |
// Process the end of the given region range in the dense prefix. |
1 | 1153 |
// This includes saving any object not updated. |
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|
1154 |
static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
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|
1155 |
size_t region_start_index, |
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changeset
|
1156 |
size_t region_end_index, |
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changeset
|
1157 |
idx_t exiting_object_offset, |
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changeset
|
1158 |
idx_t region_offset_start, |
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changeset
|
1159 |
idx_t region_offset_end); |
1 | 1160 |
|
1407
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|
1161 |
// Update a region in the dense prefix. For each live object |
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changeset
|
1162 |
// in the region, update it's interior references. For each |
1 | 1163 |
// dead object, fill it with deadwood. Dead space at the end |
1407
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|
1164 |
// of a region range will be filled to the start of the next |
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changeset
|
1165 |
// live object regardless of the region_index_end. None of the |
1 | 1166 |
// objects in the dense prefix move and dead space is dead |
1167 |
// (holds only dead objects that don't need any processing), so |
|
1168 |
// dead space can be filled in any order. |
|
1169 |
static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, |
|
1170 |
SpaceId space_id, |
|
1407
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changeset
|
1171 |
size_t region_index_start, |
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changeset
|
1172 |
size_t region_index_end); |
1 | 1173 |
|
1174 |
// Return the address of the count + 1st live word in the range [beg, end). |
|
1175 |
static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); |
|
1176 |
||
1177 |
// Return the address of the word to be copied to dest_addr, which must be |
|
1407
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diff
changeset
|
1178 |
// aligned to a region boundary. |
1 | 1179 |
static HeapWord* first_src_addr(HeapWord* const dest_addr, |
1407
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changeset
|
1180 |
size_t src_region_idx); |
1 | 1181 |
|
1407
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changeset
|
1182 |
// Determine the next source region, set closure.source() to the start of the |
9006b01ba3fd
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diff
changeset
|
1183 |
// new region return the region index. Parameter end_addr is the address one |
1 | 1184 |
// beyond the end of source range just processed. If necessary, switch to a |
1185 |
// new source space and set src_space_id (in-out parameter) and src_space_top |
|
1186 |
// (out parameter) accordingly. |
|
1407
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diff
changeset
|
1187 |
static size_t next_src_region(MoveAndUpdateClosure& closure, |
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diff
changeset
|
1188 |
SpaceId& src_space_id, |
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diff
changeset
|
1189 |
HeapWord*& src_space_top, |
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changeset
|
1190 |
HeapWord* end_addr); |
1 | 1191 |
|
1407
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changeset
|
1192 |
// Decrement the destination count for each non-empty source region in the |
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changeset
|
1193 |
// range [beg_region, region(region_align_up(end_addr))). |
1 | 1194 |
static void decrement_destination_counts(ParCompactionManager* cm, |
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|
1195 |
size_t beg_region, |
1 | 1196 |
HeapWord* end_addr); |
1197 |
||
1407
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changeset
|
1198 |
// Fill a region, copying objects from one or more source regions. |
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|
1199 |
static void fill_region(ParCompactionManager* cm, size_t region_idx); |
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|
1200 |
static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
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changeset
|
1201 |
fill_region(cm, region); |
1 | 1202 |
} |
1203 |
||
1204 |
// Update the deferred objects in the space. |
|
1205 |
static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); |
|
1206 |
||
1207 |
// Mark pointer and follow contents. |
|
360
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|
1208 |
template <class T> |
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changeset
|
1209 |
static inline void mark_and_follow(ParCompactionManager* cm, T* p); |
1 | 1210 |
|
1211 |
static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } |
|
1212 |
static ParallelCompactData& summary_data() { return _summary_data; } |
|
1213 |
||
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|
1214 |
static inline void adjust_pointer(oop* p) { adjust_pointer(p, false); } |
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changeset
|
1215 |
static inline void adjust_pointer(narrowOop* p) { adjust_pointer(p, false); } |
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changeset
|
1216 |
|
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changeset
|
1217 |
template <class T> |
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changeset
|
1218 |
static inline void adjust_pointer(T* p, |
1 | 1219 |
HeapWord* beg_addr, |
1220 |
HeapWord* end_addr); |
|
1221 |
||
1222 |
// Reference Processing |
|
1223 |
static ReferenceProcessor* const ref_processor() { return _ref_processor; } |
|
1224 |
||
1225 |
// Return the SpaceId for the given address. |
|
1226 |
static SpaceId space_id(HeapWord* addr); |
|
1227 |
||
1228 |
// Time since last full gc (in milliseconds). |
|
1229 |
static jlong millis_since_last_gc(); |
|
1230 |
||
1231 |
#ifdef VALIDATE_MARK_SWEEP |
|
360
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|
1232 |
static void track_adjusted_pointer(void* p, bool isroot); |
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changeset
|
1233 |
static void check_adjust_pointer(void* p); |
1 | 1234 |
static void track_interior_pointers(oop obj); |
1235 |
static void check_interior_pointers(); |
|
1236 |
||
1237 |
static void reset_live_oop_tracking(bool at_perm); |
|
1238 |
static void register_live_oop(oop p, size_t size); |
|
1239 |
static void validate_live_oop(oop p, size_t size); |
|
1240 |
static void live_oop_moved_to(HeapWord* q, size_t size, HeapWord* compaction_top); |
|
1241 |
static void compaction_complete(); |
|
1242 |
||
1243 |
// Querying operation of RecordMarkSweepCompaction results. |
|
1244 |
// Finds and prints the current base oop and offset for a word |
|
1245 |
// within an oop that was live during the last GC. Helpful for |
|
1246 |
// tracking down heap stomps. |
|
1247 |
static void print_new_location_of_heap_address(HeapWord* q); |
|
1248 |
#endif // #ifdef VALIDATE_MARK_SWEEP |
|
1249 |
||
1250 |
// Call backs for class unloading |
|
1251 |
// Update subklass/sibling/implementor links at end of marking. |
|
1252 |
static void revisit_weak_klass_link(ParCompactionManager* cm, Klass* k); |
|
1253 |
||
1254 |
#ifndef PRODUCT |
|
1255 |
// Debugging support. |
|
1256 |
static const char* space_names[last_space_id]; |
|
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|
1257 |
static void print_region_ranges(); |
1 | 1258 |
static void print_dense_prefix_stats(const char* const algorithm, |
1259 |
const SpaceId id, |
|
1260 |
const bool maximum_compaction, |
|
1261 |
HeapWord* const addr); |
|
1262 |
#endif // #ifndef PRODUCT |
|
1263 |
||
1264 |
#ifdef ASSERT |
|
1407
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|
1265 |
// Verify that all the regions have been emptied. |
1 | 1266 |
static void verify_complete(SpaceId space_id); |
1267 |
#endif // #ifdef ASSERT |
|
1268 |
}; |
|
1269 |
||
360
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|
1270 |
inline bool PSParallelCompact::mark_obj(oop obj) { |
1 | 1271 |
const int obj_size = obj->size(); |
1272 |
if (mark_bitmap()->mark_obj(obj, obj_size)) { |
|
1273 |
_summary_data.add_obj(obj, obj_size); |
|
1274 |
return true; |
|
1275 |
} else { |
|
1276 |
return false; |
|
1277 |
} |
|
1278 |
} |
|
1279 |
||
360
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|
1280 |
template <class T> |
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|
1281 |
inline void PSParallelCompact::follow_root(ParCompactionManager* cm, T* p) { |
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changeset
|
1282 |
assert(!Universe::heap()->is_in_reserved(p), |
21d113ecbf6a
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changeset
|
1283 |
"roots shouldn't be things within the heap"); |
21d113ecbf6a
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changeset
|
1284 |
#ifdef VALIDATE_MARK_SWEEP |
21d113ecbf6a
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changeset
|
1285 |
if (ValidateMarkSweep) { |
21d113ecbf6a
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diff
changeset
|
1286 |
guarantee(!_root_refs_stack->contains(p), "should only be in here once"); |
21d113ecbf6a
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changeset
|
1287 |
_root_refs_stack->push(p); |
21d113ecbf6a
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diff
changeset
|
1288 |
} |
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diff
changeset
|
1289 |
#endif |
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diff
changeset
|
1290 |
T heap_oop = oopDesc::load_heap_oop(p); |
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changeset
|
1291 |
if (!oopDesc::is_null(heap_oop)) { |
21d113ecbf6a
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changeset
|
1292 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
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changeset
|
1293 |
if (mark_bitmap()->is_unmarked(obj)) { |
21d113ecbf6a
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changeset
|
1294 |
if (mark_obj(obj)) { |
21d113ecbf6a
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diff
changeset
|
1295 |
obj->follow_contents(cm); |
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diff
changeset
|
1296 |
} |
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diff
changeset
|
1297 |
} |
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diff
changeset
|
1298 |
} |
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changeset
|
1299 |
follow_stack(cm); |
21d113ecbf6a
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changeset
|
1300 |
} |
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changeset
|
1301 |
|
21d113ecbf6a
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changeset
|
1302 |
template <class T> |
21d113ecbf6a
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changeset
|
1303 |
inline void PSParallelCompact::mark_and_follow(ParCompactionManager* cm, |
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changeset
|
1304 |
T* p) { |
21d113ecbf6a
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changeset
|
1305 |
T heap_oop = oopDesc::load_heap_oop(p); |
21d113ecbf6a
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changeset
|
1306 |
if (!oopDesc::is_null(heap_oop)) { |
21d113ecbf6a
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diff
changeset
|
1307 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
21d113ecbf6a
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diff
changeset
|
1308 |
if (mark_bitmap()->is_unmarked(obj)) { |
21d113ecbf6a
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diff
changeset
|
1309 |
if (mark_obj(obj)) { |
21d113ecbf6a
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parents:
1
diff
changeset
|
1310 |
obj->follow_contents(cm); |
21d113ecbf6a
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parents:
1
diff
changeset
|
1311 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1312 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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parents:
1
diff
changeset
|
1313 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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parents:
1
diff
changeset
|
1314 |
} |
21d113ecbf6a
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coleenp
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1
diff
changeset
|
1315 |
|
21d113ecbf6a
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diff
changeset
|
1316 |
template <class T> |
21d113ecbf6a
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diff
changeset
|
1317 |
inline void PSParallelCompact::mark_and_push(ParCompactionManager* cm, T* p) { |
21d113ecbf6a
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diff
changeset
|
1318 |
T heap_oop = oopDesc::load_heap_oop(p); |
21d113ecbf6a
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diff
changeset
|
1319 |
if (!oopDesc::is_null(heap_oop)) { |
21d113ecbf6a
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1
diff
changeset
|
1320 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
21d113ecbf6a
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changeset
|
1321 |
if (mark_bitmap()->is_unmarked(obj)) { |
21d113ecbf6a
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1
diff
changeset
|
1322 |
if (mark_obj(obj)) { |
21d113ecbf6a
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1
diff
changeset
|
1323 |
// This thread marked the object and owns the subsequent processing of it. |
21d113ecbf6a
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1
diff
changeset
|
1324 |
cm->save_for_scanning(obj); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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parents:
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diff
changeset
|
1325 |
} |
21d113ecbf6a
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coleenp
parents:
1
diff
changeset
|
1326 |
} |
21d113ecbf6a
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coleenp
parents:
1
diff
changeset
|
1327 |
} |
21d113ecbf6a
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coleenp
parents:
1
diff
changeset
|
1328 |
} |
21d113ecbf6a
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coleenp
parents:
1
diff
changeset
|
1329 |
|
21d113ecbf6a
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1
diff
changeset
|
1330 |
template <class T> |
21d113ecbf6a
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diff
changeset
|
1331 |
inline void PSParallelCompact::adjust_pointer(T* p, bool isroot) { |
21d113ecbf6a
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diff
changeset
|
1332 |
T heap_oop = oopDesc::load_heap_oop(p); |
21d113ecbf6a
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diff
changeset
|
1333 |
if (!oopDesc::is_null(heap_oop)) { |
21d113ecbf6a
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diff
changeset
|
1334 |
oop obj = oopDesc::decode_heap_oop_not_null(heap_oop); |
21d113ecbf6a
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diff
changeset
|
1335 |
oop new_obj = (oop)summary_data().calc_new_pointer(obj); |
21d113ecbf6a
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diff
changeset
|
1336 |
assert(new_obj != NULL || // is forwarding ptr? |
21d113ecbf6a
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1
diff
changeset
|
1337 |
obj->is_shared(), // never forwarded? |
21d113ecbf6a
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1
diff
changeset
|
1338 |
"should be forwarded"); |
21d113ecbf6a
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1
diff
changeset
|
1339 |
// Just always do the update unconditionally? |
21d113ecbf6a
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1
diff
changeset
|
1340 |
if (new_obj != NULL) { |
21d113ecbf6a
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1
diff
changeset
|
1341 |
assert(Universe::heap()->is_in_reserved(new_obj), |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1342 |
"should be in object space"); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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1
diff
changeset
|
1343 |
oopDesc::encode_store_heap_oop_not_null(p, new_obj); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1344 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1345 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1346 |
VALIDATE_MARK_SWEEP_ONLY(track_adjusted_pointer(p, isroot)); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1347 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1348 |
|
21d113ecbf6a
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1
diff
changeset
|
1349 |
template <class T> |
21d113ecbf6a
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1
diff
changeset
|
1350 |
inline void PSParallelCompact::KeepAliveClosure::do_oop_work(T* p) { |
21d113ecbf6a
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diff
changeset
|
1351 |
#ifdef VALIDATE_MARK_SWEEP |
21d113ecbf6a
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1
diff
changeset
|
1352 |
if (ValidateMarkSweep) { |
21d113ecbf6a
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1
diff
changeset
|
1353 |
if (!Universe::heap()->is_in_reserved(p)) { |
21d113ecbf6a
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1
diff
changeset
|
1354 |
_root_refs_stack->push(p); |
21d113ecbf6a
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diff
changeset
|
1355 |
} else { |
21d113ecbf6a
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diff
changeset
|
1356 |
_other_refs_stack->push(p); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1357 |
} |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1358 |
} |
21d113ecbf6a
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coleenp
parents:
1
diff
changeset
|
1359 |
#endif |
21d113ecbf6a
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parents:
1
diff
changeset
|
1360 |
mark_and_push(_compaction_manager, p); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
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parents:
1
diff
changeset
|
1361 |
} |
21d113ecbf6a
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diff
changeset
|
1362 |
|
21d113ecbf6a
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diff
changeset
|
1363 |
inline bool PSParallelCompact::print_phases() { |
1 | 1364 |
return _print_phases; |
1365 |
} |
|
1366 |
||
360
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changeset
|
1367 |
inline double PSParallelCompact::normal_distribution(double density) { |
1 | 1368 |
assert(_dwl_initialized, "uninitialized"); |
1369 |
const double squared_term = (density - _dwl_mean) / _dwl_std_dev; |
|
1370 |
return _dwl_first_term * exp(-0.5 * squared_term * squared_term); |
|
1371 |
} |
|
1372 |
||
1373 |
inline bool |
|
1407
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977
diff
changeset
|
1374 |
PSParallelCompact::dead_space_crosses_boundary(const RegionData* region, |
1 | 1375 |
idx_t bit) |
1376 |
{ |
|
1407
9006b01ba3fd
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parents:
977
diff
changeset
|
1377 |
assert(bit > 0, "cannot call this for the first bit/region"); |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
1378 |
assert(_summary_data.region_to_addr(region) == _mark_bitmap.bit_to_addr(bit), |
1 | 1379 |
"sanity check"); |
1380 |
||
1381 |
// Dead space crosses the boundary if (1) a partial object does not extend |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1382 |
// onto the region, (2) an object does not start at the beginning of the |
9006b01ba3fd
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parents:
977
diff
changeset
|
1383 |
// region, and (3) an object does not end at the end of the prior region. |
9006b01ba3fd
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parents:
977
diff
changeset
|
1384 |
return region->partial_obj_size() == 0 && |
1 | 1385 |
!_mark_bitmap.is_obj_beg(bit) && |
1386 |
!_mark_bitmap.is_obj_end(bit - 1); |
|
1387 |
} |
|
1388 |
||
1389 |
inline bool |
|
1390 |
PSParallelCompact::is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr) { |
|
1391 |
return p >= beg_addr && p < end_addr; |
|
1392 |
} |
|
1393 |
||
1394 |
inline bool |
|
1395 |
PSParallelCompact::is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr) { |
|
1396 |
return is_in((HeapWord*)p, beg_addr, end_addr); |
|
1397 |
} |
|
1398 |
||
1399 |
inline MutableSpace* PSParallelCompact::space(SpaceId id) { |
|
1400 |
assert(id < last_space_id, "id out of range"); |
|
1401 |
return _space_info[id].space(); |
|
1402 |
} |
|
1403 |
||
1404 |
inline HeapWord* PSParallelCompact::new_top(SpaceId id) { |
|
1405 |
assert(id < last_space_id, "id out of range"); |
|
1406 |
return _space_info[id].new_top(); |
|
1407 |
} |
|
1408 |
||
1409 |
inline HeapWord* PSParallelCompact::dense_prefix(SpaceId id) { |
|
1410 |
assert(id < last_space_id, "id out of range"); |
|
1411 |
return _space_info[id].dense_prefix(); |
|
1412 |
} |
|
1413 |
||
1414 |
inline ObjectStartArray* PSParallelCompact::start_array(SpaceId id) { |
|
1415 |
assert(id < last_space_id, "id out of range"); |
|
1416 |
return _space_info[id].start_array(); |
|
1417 |
} |
|
1418 |
||
1419 |
inline bool PSParallelCompact::should_update_klass(klassOop k) { |
|
1420 |
return ((HeapWord*) k) >= dense_prefix(perm_space_id); |
|
1421 |
} |
|
1422 |
||
360
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changeset
|
1423 |
template <class T> |
21d113ecbf6a
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1
diff
changeset
|
1424 |
inline void PSParallelCompact::adjust_pointer(T* p, |
1 | 1425 |
HeapWord* beg_addr, |
1426 |
HeapWord* end_addr) { |
|
360
21d113ecbf6a
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diff
changeset
|
1427 |
if (is_in((HeapWord*)p, beg_addr, end_addr)) { |
1 | 1428 |
adjust_pointer(p); |
1429 |
} |
|
1430 |
} |
|
1431 |
||
1432 |
class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
|
1433 |
public: |
|
1434 |
inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, |
|
1435 |
ObjectStartArray* start_array, |
|
1436 |
HeapWord* destination, size_t words); |
|
1437 |
||
1438 |
// Accessors. |
|
1439 |
HeapWord* destination() const { return _destination; } |
|
1440 |
||
1441 |
// If the object will fit (size <= words_remaining()), copy it to the current |
|
1442 |
// destination, update the interior oops and the start array and return either |
|
1443 |
// full (if the closure is full) or incomplete. If the object will not fit, |
|
1444 |
// return would_overflow. |
|
1445 |
virtual IterationStatus do_addr(HeapWord* addr, size_t size); |
|
1446 |
||
1447 |
// Copy enough words to fill this closure, starting at source(). Interior |
|
1448 |
// oops and the start array are not updated. Return full. |
|
1449 |
IterationStatus copy_until_full(); |
|
1450 |
||
1451 |
// Copy enough words to fill this closure or to the end of an object, |
|
1452 |
// whichever is smaller, starting at source(). Interior oops and the start |
|
1453 |
// array are not updated. |
|
1454 |
void copy_partial_obj(); |
|
1455 |
||
1456 |
protected: |
|
1457 |
// Update variables to indicate that word_count words were processed. |
|
1458 |
inline void update_state(size_t word_count); |
|
1459 |
||
1460 |
protected: |
|
1461 |
ObjectStartArray* const _start_array; |
|
1462 |
HeapWord* _destination; // Next addr to be written. |
|
1463 |
}; |
|
1464 |
||
1465 |
inline |
|
1466 |
MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, |
|
1467 |
ParCompactionManager* cm, |
|
1468 |
ObjectStartArray* start_array, |
|
1469 |
HeapWord* destination, |
|
1470 |
size_t words) : |
|
1471 |
ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) |
|
1472 |
{ |
|
1473 |
_destination = destination; |
|
1474 |
} |
|
1475 |
||
1476 |
inline void MoveAndUpdateClosure::update_state(size_t words) |
|
1477 |
{ |
|
1478 |
decrement_words_remaining(words); |
|
1479 |
_source += words; |
|
1480 |
_destination += words; |
|
1481 |
} |
|
1482 |
||
1483 |
class UpdateOnlyClosure: public ParMarkBitMapClosure { |
|
1484 |
private: |
|
1485 |
const PSParallelCompact::SpaceId _space_id; |
|
1486 |
ObjectStartArray* const _start_array; |
|
1487 |
||
1488 |
public: |
|
1489 |
UpdateOnlyClosure(ParMarkBitMap* mbm, |
|
1490 |
ParCompactionManager* cm, |
|
1491 |
PSParallelCompact::SpaceId space_id); |
|
1492 |
||
1493 |
// Update the object. |
|
1494 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words); |
|
1495 |
||
1496 |
inline void do_addr(HeapWord* addr); |
|
1497 |
}; |
|
1498 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1499 |
inline void UpdateOnlyClosure::do_addr(HeapWord* addr) |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1500 |
{ |
1 | 1501 |
_start_array->allocate_block(addr); |
1502 |
oop(addr)->update_contents(compaction_manager()); |
|
1503 |
} |
|
1504 |
||
1505 |
class FillClosure: public ParMarkBitMapClosure { |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1506 |
public: |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1507 |
FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id) : |
1 | 1508 |
ParMarkBitMapClosure(PSParallelCompact::mark_bitmap(), cm), |
1509 |
_space_id(space_id), |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1510 |
_start_array(PSParallelCompact::start_array(space_id)) { |
1 | 1511 |
assert(_space_id == PSParallelCompact::perm_space_id || |
1512 |
_space_id == PSParallelCompact::old_space_id, |
|
1513 |
"cannot use FillClosure in the young gen"); |
|
1514 |
assert(bitmap() != NULL, "need a bitmap"); |
|
1515 |
assert(_start_array != NULL, "need a start array"); |
|
1516 |
} |
|
1517 |
||
1518 |
void fill_region(HeapWord* addr, size_t size) { |
|
1519 |
MemRegion region(addr, size); |
|
1520 |
SharedHeap::fill_region_with_object(region); |
|
1521 |
_start_array->allocate_block(addr); |
|
1522 |
} |
|
1523 |
||
1524 |
virtual IterationStatus do_addr(HeapWord* addr, size_t size) { |
|
1525 |
fill_region(addr, size); |
|
1526 |
return ParMarkBitMap::incomplete; |
|
1527 |
} |
|
1528 |
||
1529 |
private: |
|
1530 |
const PSParallelCompact::SpaceId _space_id; |
|
1531 |
ObjectStartArray* const _start_array; |
|
1532 |
}; |