author | eosterlund |
Wed, 23 Aug 2017 14:01:17 +0200 | |
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/* |
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* Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_PARALLEL_PSPARALLELCOMPACT_HPP |
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#define SHARE_VM_GC_PARALLEL_PSPARALLELCOMPACT_HPP |
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#include "gc/parallel/mutableSpace.hpp" |
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#include "gc/parallel/objectStartArray.hpp" |
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#include "gc/parallel/parMarkBitMap.hpp" |
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#include "gc/parallel/parallelScavengeHeap.hpp" |
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#include "gc/shared/collectedHeap.hpp" |
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#include "gc/shared/collectorCounters.hpp" |
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#include "oops/oop.hpp" |
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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 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 ParallelOldTracer; |
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class STWGCTimer; |
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// The SplitInfo class holds the information needed to 'split' a source region |
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// so that the live data can be copied to two destination *spaces*. Normally, |
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// all the live data in a region is copied to a single destination space (e.g., |
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// everything live in a region in eden is copied entirely into the old gen). |
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// However, when the heap is nearly full, all the live data in eden may not fit |
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// into the old gen. Copying only some of the regions from eden to old gen |
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// requires finding a region that does not contain a partial object (i.e., no |
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// live object crosses the region boundary) somewhere near the last object that |
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// does fit into the old gen. Since it's not always possible to find such a |
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// region, splitting is necessary for predictable behavior. |
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// |
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// A region is always split at the end of the partial object. This avoids |
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// additional tests when calculating the new location of a pointer, which is a |
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// very hot code path. The partial object and everything to its left will be |
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// copied to another space (call it dest_space_1). The live data to the right |
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// of the partial object will be copied either within the space itself, or to a |
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// different destination space (distinct from dest_space_1). |
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// |
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// Split points are identified during the summary phase, when region |
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// destinations are computed: data about the split, including the |
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// partial_object_size, is recorded in a SplitInfo record and the |
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// partial_object_size field in the summary data is set to zero. The zeroing is |
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// possible (and necessary) since the partial object will move to a different |
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// destination space than anything to its right, thus the partial object should |
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// not affect the locations of any objects to its right. |
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// |
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// The recorded data is used during the compaction phase, but only rarely: when |
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// the partial object on the split region will be copied across a destination |
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// region boundary. This test is made once each time a region is filled, and is |
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// a simple address comparison, so the overhead is negligible (see |
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// PSParallelCompact::first_src_addr()). |
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// |
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// Notes: |
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// |
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// Only regions with partial objects are split; a region without a partial |
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// object does not need any extra bookkeeping. |
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// |
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// At most one region is split per space, so the amount of data required is |
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// constant. |
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// |
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// A region is split only when the destination space would overflow. Once that |
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// happens, the destination space is abandoned and no other data (even from |
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// other source spaces) is targeted to that destination space. Abandoning the |
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// destination space may leave a somewhat large unused area at the end, if a |
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// large object caused the overflow. |
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// |
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// Future work: |
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// |
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// More bookkeeping would be required to continue to use the destination space. |
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// The most general solution would allow data from regions in two different |
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// source spaces to be "joined" in a single destination region. At the very |
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// least, additional code would be required in next_src_region() to detect the |
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// join and skip to an out-of-order source region. If the join region was also |
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// the last destination region to which a split region was copied (the most |
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// likely case), then additional work would be needed to get fill_region() to |
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// stop iteration and switch to a new source region at the right point. Basic |
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// idea would be to use a fake value for the top of the source space. It is |
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// doable, if a bit tricky. |
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// |
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// A simpler (but less general) solution would fill the remainder of the |
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// destination region with a dummy object and continue filling the next |
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// destination region. |
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class SplitInfo |
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{ |
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public: |
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// Return true if this split info is valid (i.e., if a split has been |
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// recorded). The very first region cannot have a partial object and thus is |
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// never split, so 0 is the 'invalid' value. |
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bool is_valid() const { return _src_region_idx > 0; } |
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// Return true if this split holds data for the specified source region. |
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inline bool is_split(size_t source_region) const; |
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// The index of the split region, the size of the partial object on that |
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// region and the destination of the partial object. |
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size_t src_region_idx() const { return _src_region_idx; } |
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size_t partial_obj_size() const { return _partial_obj_size; } |
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HeapWord* destination() const { return _destination; } |
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// The destination count of the partial object referenced by this split |
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// (either 1 or 2). This must be added to the destination count of the |
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// remainder of the source region. |
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unsigned int destination_count() const { return _destination_count; } |
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// If a word within the partial object will be written to the first word of a |
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// destination region, this is the address of the destination region; |
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// otherwise this is NULL. |
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HeapWord* dest_region_addr() const { return _dest_region_addr; } |
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|
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// If a word within the partial object will be written to the first word of a |
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// destination region, this is the address of that word within the partial |
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// object; otherwise this is NULL. |
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HeapWord* first_src_addr() const { return _first_src_addr; } |
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// Record the data necessary to split the region src_region_idx. |
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void record(size_t src_region_idx, size_t partial_obj_size, |
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HeapWord* destination); |
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void clear(); |
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DEBUG_ONLY(void verify_clear();) |
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private: |
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size_t _src_region_idx; |
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size_t _partial_obj_size; |
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HeapWord* _destination; |
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unsigned int _destination_count; |
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HeapWord* _dest_region_addr; |
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HeapWord* _first_src_addr; |
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}; |
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|
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inline bool SplitInfo::is_split(size_t region_idx) const |
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{ |
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return _src_region_idx == region_idx && is_valid(); |
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} |
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1 | 168 |
class SpaceInfo |
169 |
{ |
|
170 |
public: |
|
171 |
MutableSpace* space() const { return _space; } |
|
172 |
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173 |
// Where the free space will start after the collection. Valid only after the |
|
174 |
// summary phase completes. |
|
175 |
HeapWord* new_top() const { return _new_top; } |
|
176 |
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177 |
// Allows new_top to be set. |
|
178 |
HeapWord** new_top_addr() { return &_new_top; } |
|
179 |
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180 |
// Where the smallest allowable dense prefix ends (used only for perm gen). |
|
181 |
HeapWord* min_dense_prefix() const { return _min_dense_prefix; } |
|
182 |
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183 |
// Where the dense prefix ends, or the compacted region begins. |
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184 |
HeapWord* dense_prefix() const { return _dense_prefix; } |
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185 |
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186 |
// The start array for the (generation containing the) space, or NULL if there |
|
187 |
// is no start array. |
|
188 |
ObjectStartArray* start_array() const { return _start_array; } |
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189 |
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SplitInfo& split_info() { return _split_info; } |
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|
1 | 192 |
void set_space(MutableSpace* s) { _space = s; } |
193 |
void set_new_top(HeapWord* addr) { _new_top = addr; } |
|
194 |
void set_min_dense_prefix(HeapWord* addr) { _min_dense_prefix = addr; } |
|
195 |
void set_dense_prefix(HeapWord* addr) { _dense_prefix = addr; } |
|
196 |
void set_start_array(ObjectStartArray* s) { _start_array = s; } |
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197 |
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void publish_new_top() const { _space->set_top(_new_top); } |
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|
1 | 200 |
private: |
201 |
MutableSpace* _space; |
|
202 |
HeapWord* _new_top; |
|
203 |
HeapWord* _min_dense_prefix; |
|
204 |
HeapWord* _dense_prefix; |
|
205 |
ObjectStartArray* _start_array; |
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SplitInfo _split_info; |
1 | 207 |
}; |
208 |
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209 |
class ParallelCompactData |
|
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{ |
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211 |
public: |
|
212 |
// 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; |
1 | 216 |
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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; |
1 | 223 |
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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 BlockSizeBytes; |
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227 |
|
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static const size_t BlockSizeOffsetMask; |
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static const size_t BlockAddrOffsetMask; |
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static const size_t BlockAddrMask; |
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231 |
|
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static const size_t BlocksPerRegion; |
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static const size_t Log2BlocksPerRegion; |
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234 |
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class RegionData |
1 | 236 |
{ |
237 |
public: |
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// Destination address of the region. |
1 | 239 |
HeapWord* destination() const { return _destination; } |
240 |
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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; } |
1 | 243 |
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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 |
1 | 246 |
// 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 |
1 | 248 |
// time, so the same field is used to save space. |
249 |
HeapWord* deferred_obj_addr() const { return _partial_obj_addr; } |
|
250 |
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// The starting address of the partial object extending onto the region. |
1 | 252 |
HeapWord* partial_obj_addr() const { return _partial_obj_addr; } |
253 |
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// Size of the partial object extending onto the region (words). |
1 | 255 |
size_t partial_obj_size() const { return _partial_obj_size; } |
256 |
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// Size of live data that lies within this region due to objects that start |
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258 |
// 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). |
1 | 261 |
size_t live_obj_size() const { return _dc_and_los & los_mask; } |
262 |
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// Total live data that lies within the region (words). |
1 | 264 |
size_t data_size() const { return partial_obj_size() + live_obj_size(); } |
265 |
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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 |
1 | 268 |
// values of destination_count are |
269 |
// |
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270 |
// 0 - data from the region will be compacted completely into itself, or the |
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271 |
// region is empty. The region can be claimed and then filled. |
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272 |
// 1 - data from the region will be compacted into 1 other region; some |
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273 |
// data from the region may also be compacted into the region itself. |
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274 |
// 2 - data from the region will be copied to 2 other regions. |
1 | 275 |
// |
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276 |
// During compaction as regions are emptied, the destination_count is |
1 | 277 |
// decremented (atomically) and when it reaches 0, it can be claimed and |
278 |
// then filled. |
|
279 |
// |
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280 |
// A region is claimed for processing by atomically changing the |
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281 |
// destination_count to the claimed value (dc_claimed). After a region has |
1 | 282 |
// been filled, the destination_count should be set to the completed value |
283 |
// (dc_completed). |
|
284 |
inline uint destination_count() const; |
|
285 |
inline uint destination_count_raw() const; |
|
286 |
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// Whether the block table for this region has been filled. |
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288 |
inline bool blocks_filled() const; |
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289 |
|
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290 |
// Number of times the block table was filled. |
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291 |
DEBUG_ONLY(inline size_t blocks_filled_count() const;) |
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292 |
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293 |
// The location of the java heap data that corresponds to this region. |
1 | 294 |
inline HeapWord* data_location() const; |
295 |
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296 |
// The highest address referenced by objects in this region. |
1 | 297 |
inline HeapWord* highest_ref() const; |
298 |
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299 |
// Whether this region is available to be claimed, has been claimed, or has |
1 | 300 |
// been completed. |
301 |
// |
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302 |
// Minor subtlety: claimed() returns true if the region is marked |
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303 |
// completed(), which is desirable since a region must be claimed before it |
1 | 304 |
// can be completed. |
305 |
bool available() const { return _dc_and_los < dc_one; } |
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306 |
bool claimed() const { return _dc_and_los >= dc_claimed; } |
1 | 307 |
bool completed() const { return _dc_and_los >= dc_completed; } |
308 |
||
309 |
// These are not atomic. |
|
310 |
void set_destination(HeapWord* addr) { _destination = addr; } |
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311 |
void set_source_region(size_t region) { _source_region = region; } |
1 | 312 |
void set_deferred_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
313 |
void set_partial_obj_addr(HeapWord* addr) { _partial_obj_addr = addr; } |
|
314 |
void set_partial_obj_size(size_t words) { |
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_partial_obj_size = (region_sz_t) words; |
1 | 316 |
} |
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317 |
inline void set_blocks_filled(); |
1 | 318 |
|
319 |
inline void set_destination_count(uint count); |
|
320 |
inline void set_live_obj_size(size_t words); |
|
321 |
inline void set_data_location(HeapWord* addr); |
|
322 |
inline void set_completed(); |
|
323 |
inline bool claim_unsafe(); |
|
324 |
||
325 |
// These are atomic. |
|
326 |
inline void add_live_obj(size_t words); |
|
327 |
inline void set_highest_ref(HeapWord* addr); |
|
328 |
inline void decrement_destination_count(); |
|
329 |
inline bool claim(); |
|
330 |
||
331 |
private: |
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332 |
// The type used to represent object sizes within a region. |
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333 |
typedef uint region_sz_t; |
1 | 334 |
|
335 |
// Constants for manipulating the _dc_and_los field, which holds both the |
|
336 |
// destination count and live obj size. The live obj size lives at the |
|
337 |
// least significant end so no masking is necessary when adding. |
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338 |
static const region_sz_t dc_shift; // Shift amount. |
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339 |
static const region_sz_t dc_mask; // Mask for destination count. |
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340 |
static const region_sz_t dc_one; // 1, shifted appropriately. |
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341 |
static const region_sz_t dc_claimed; // Region has been claimed. |
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342 |
static const region_sz_t dc_completed; // Region has been completed. |
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343 |
static const region_sz_t los_mask; // Mask for live obj size. |
1 | 344 |
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345 |
HeapWord* _destination; |
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346 |
size_t _source_region; |
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347 |
HeapWord* _partial_obj_addr; |
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348 |
region_sz_t _partial_obj_size; |
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349 |
region_sz_t volatile _dc_and_los; |
33758 | 350 |
bool volatile _blocks_filled; |
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351 |
|
1 | 352 |
#ifdef ASSERT |
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353 |
size_t _blocks_filled_count; // Number of block table fills. |
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354 |
|
1 | 355 |
// These enable optimizations that are only partially implemented. Use |
356 |
// debug builds to prevent the code fragments from breaking. |
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357 |
HeapWord* _data_location; |
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358 |
HeapWord* _highest_ref; |
1 | 359 |
#endif // #ifdef ASSERT |
360 |
||
361 |
#ifdef ASSERT |
|
362 |
public: |
|
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363 |
uint _pushed; // 0 until region is pushed onto a stack |
1 | 364 |
private: |
365 |
#endif |
|
366 |
}; |
|
367 |
||
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368 |
// "Blocks" allow shorter sections of the bitmap to be searched. Each Block |
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369 |
// holds an offset, which is the amount of live data in the Region to the left |
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370 |
// of the first live object that starts in the Block. |
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371 |
class BlockData |
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372 |
{ |
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373 |
public: |
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374 |
typedef unsigned short int blk_ofs_t; |
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375 |
|
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376 |
blk_ofs_t offset() const { return _offset; } |
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377 |
void set_offset(size_t val) { _offset = (blk_ofs_t)val; } |
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378 |
|
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379 |
private: |
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380 |
blk_ofs_t _offset; |
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381 |
}; |
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382 |
|
1 | 383 |
public: |
384 |
ParallelCompactData(); |
|
385 |
bool initialize(MemRegion covered_region); |
|
386 |
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387 |
size_t region_count() const { return _region_count; } |
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388 |
size_t reserved_byte_size() const { return _reserved_byte_size; } |
1 | 389 |
|
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390 |
// Convert region indices to/from RegionData pointers. |
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391 |
inline RegionData* region(size_t region_idx) const; |
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392 |
inline size_t region(const RegionData* const region_ptr) const; |
1 | 393 |
|
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394 |
size_t block_count() const { return _block_count; } |
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395 |
inline BlockData* block(size_t block_idx) const; |
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396 |
inline size_t block(const BlockData* block_ptr) const; |
1 | 397 |
|
398 |
void add_obj(HeapWord* addr, size_t len); |
|
399 |
void add_obj(oop p, size_t len) { add_obj((HeapWord*)p, len); } |
|
400 |
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401 |
// Fill in the regions covering [beg, end) so that no data moves; i.e., the |
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402 |
// destination of region n is simply the start of region n. The argument beg |
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403 |
// must be region-aligned; end need not be. |
1 | 404 |
void summarize_dense_prefix(HeapWord* beg, HeapWord* end); |
405 |
||
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|
406 |
HeapWord* summarize_split_space(size_t src_region, SplitInfo& split_info, |
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|
407 |
HeapWord* destination, HeapWord* target_end, |
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|
408 |
HeapWord** target_next); |
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|
409 |
bool summarize(SplitInfo& split_info, |
1 | 410 |
HeapWord* source_beg, HeapWord* source_end, |
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|
411 |
HeapWord** source_next, |
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|
412 |
HeapWord* target_beg, HeapWord* target_end, |
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|
413 |
HeapWord** target_next); |
1 | 414 |
|
415 |
void clear(); |
|
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|
416 |
void clear_range(size_t beg_region, size_t end_region); |
1 | 417 |
void clear_range(HeapWord* beg, HeapWord* end) { |
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|
418 |
clear_range(addr_to_region_idx(beg), addr_to_region_idx(end)); |
1 | 419 |
} |
420 |
||
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|
421 |
// Return the number of words between addr and the start of the region |
1 | 422 |
// containing addr. |
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|
423 |
inline size_t region_offset(const HeapWord* addr) const; |
1 | 424 |
|
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425 |
// Convert addresses to/from a region index or region pointer. |
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426 |
inline size_t addr_to_region_idx(const HeapWord* addr) const; |
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|
427 |
inline RegionData* addr_to_region_ptr(const HeapWord* addr) const; |
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|
428 |
inline HeapWord* region_to_addr(size_t region) const; |
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|
429 |
inline HeapWord* region_to_addr(size_t region, size_t offset) const; |
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|
430 |
inline HeapWord* region_to_addr(const RegionData* region) const; |
1 | 431 |
|
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432 |
inline HeapWord* region_align_down(HeapWord* addr) const; |
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|
433 |
inline HeapWord* region_align_up(HeapWord* addr) const; |
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434 |
inline bool is_region_aligned(HeapWord* addr) const; |
1 | 435 |
|
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436 |
// Analogous to region_offset() for blocks. |
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437 |
size_t block_offset(const HeapWord* addr) const; |
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438 |
size_t addr_to_block_idx(const HeapWord* addr) const; |
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439 |
size_t addr_to_block_idx(const oop obj) const { |
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|
440 |
return addr_to_block_idx((HeapWord*) obj); |
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|
441 |
} |
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442 |
inline BlockData* addr_to_block_ptr(const HeapWord* addr) const; |
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443 |
inline HeapWord* block_to_addr(size_t block) const; |
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|
444 |
inline size_t region_to_block_idx(size_t region) const; |
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|
445 |
|
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|
446 |
inline HeapWord* block_align_down(HeapWord* addr) const; |
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|
447 |
inline HeapWord* block_align_up(HeapWord* addr) const; |
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|
448 |
inline bool is_block_aligned(HeapWord* addr) const; |
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|
449 |
|
1 | 450 |
// Return the address one past the end of the partial object. |
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|
451 |
HeapWord* partial_obj_end(size_t region_idx) const; |
1 | 452 |
|
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453 |
// Return the location of the object after compaction. |
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|
454 |
HeapWord* calc_new_pointer(HeapWord* addr, ParCompactionManager* cm); |
1 | 455 |
|
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|
456 |
HeapWord* calc_new_pointer(oop p, ParCompactionManager* cm) { |
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|
457 |
return calc_new_pointer((HeapWord*) p, cm); |
1 | 458 |
} |
459 |
||
460 |
#ifdef ASSERT |
|
461 |
void verify_clear(const PSVirtualSpace* vspace); |
|
462 |
void verify_clear(); |
|
463 |
#endif // #ifdef ASSERT |
|
464 |
||
465 |
private: |
|
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|
466 |
bool initialize_block_data(); |
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|
467 |
bool initialize_region_data(size_t region_size); |
1 | 468 |
PSVirtualSpace* create_vspace(size_t count, size_t element_size); |
469 |
||
470 |
private: |
|
471 |
HeapWord* _region_start; |
|
472 |
#ifdef ASSERT |
|
473 |
HeapWord* _region_end; |
|
474 |
#endif // #ifdef ASSERT |
|
475 |
||
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|
476 |
PSVirtualSpace* _region_vspace; |
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|
477 |
size_t _reserved_byte_size; |
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|
478 |
RegionData* _region_data; |
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|
479 |
size_t _region_count; |
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|
480 |
|
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|
481 |
PSVirtualSpace* _block_vspace; |
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|
482 |
BlockData* _block_data; |
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|
483 |
size_t _block_count; |
1 | 484 |
}; |
485 |
||
486 |
inline uint |
|
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|
487 |
ParallelCompactData::RegionData::destination_count_raw() const |
1 | 488 |
{ |
489 |
return _dc_and_los & dc_mask; |
|
490 |
} |
|
491 |
||
492 |
inline uint |
|
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|
493 |
ParallelCompactData::RegionData::destination_count() const |
1 | 494 |
{ |
495 |
return destination_count_raw() >> dc_shift; |
|
496 |
} |
|
497 |
||
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|
498 |
inline bool |
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|
499 |
ParallelCompactData::RegionData::blocks_filled() const |
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|
500 |
{ |
33758 | 501 |
bool result = _blocks_filled; |
502 |
OrderAccess::acquire(); |
|
503 |
return result; |
|
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|
504 |
} |
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|
505 |
|
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|
506 |
#ifdef ASSERT |
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|
507 |
inline size_t |
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|
508 |
ParallelCompactData::RegionData::blocks_filled_count() const |
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|
509 |
{ |
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|
510 |
return _blocks_filled_count; |
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|
511 |
} |
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|
512 |
#endif // #ifdef ASSERT |
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|
513 |
|
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|
514 |
inline void |
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|
515 |
ParallelCompactData::RegionData::set_blocks_filled() |
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|
516 |
{ |
33758 | 517 |
OrderAccess::release(); |
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|
518 |
_blocks_filled = true; |
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|
519 |
// Debug builds count the number of times the table was filled. |
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|
520 |
DEBUG_ONLY(Atomic::inc_ptr(&_blocks_filled_count)); |
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|
521 |
} |
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|
522 |
|
1 | 523 |
inline void |
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|
524 |
ParallelCompactData::RegionData::set_destination_count(uint count) |
1 | 525 |
{ |
526 |
assert(count <= (dc_completed >> dc_shift), "count too large"); |
|
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|
527 |
const region_sz_t live_sz = (region_sz_t) live_obj_size(); |
1 | 528 |
_dc_and_los = (count << dc_shift) | live_sz; |
529 |
} |
|
530 |
||
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|
531 |
inline void ParallelCompactData::RegionData::set_live_obj_size(size_t words) |
1 | 532 |
{ |
533 |
assert(words <= los_mask, "would overflow"); |
|
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|
534 |
_dc_and_los = destination_count_raw() | (region_sz_t)words; |
1 | 535 |
} |
536 |
||
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|
537 |
inline void ParallelCompactData::RegionData::decrement_destination_count() |
1 | 538 |
{ |
539 |
assert(_dc_and_los < dc_claimed, "already claimed"); |
|
540 |
assert(_dc_and_los >= dc_one, "count would go negative"); |
|
541 |
Atomic::add((int)dc_mask, (volatile int*)&_dc_and_los); |
|
542 |
} |
|
543 |
||
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|
544 |
inline HeapWord* ParallelCompactData::RegionData::data_location() const |
1 | 545 |
{ |
546 |
DEBUG_ONLY(return _data_location;) |
|
547 |
NOT_DEBUG(return NULL;) |
|
548 |
} |
|
549 |
||
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|
550 |
inline HeapWord* ParallelCompactData::RegionData::highest_ref() const |
1 | 551 |
{ |
552 |
DEBUG_ONLY(return _highest_ref;) |
|
553 |
NOT_DEBUG(return NULL;) |
|
554 |
} |
|
555 |
||
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|
556 |
inline void ParallelCompactData::RegionData::set_data_location(HeapWord* addr) |
1 | 557 |
{ |
558 |
DEBUG_ONLY(_data_location = addr;) |
|
559 |
} |
|
560 |
||
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|
561 |
inline void ParallelCompactData::RegionData::set_completed() |
1 | 562 |
{ |
563 |
assert(claimed(), "must be claimed first"); |
|
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|
564 |
_dc_and_los = dc_completed | (region_sz_t) live_obj_size(); |
1 | 565 |
} |
566 |
||
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|
567 |
// MT-unsafe claiming of a region. Should only be used during single threaded |
1 | 568 |
// execution. |
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|
569 |
inline bool ParallelCompactData::RegionData::claim_unsafe() |
1 | 570 |
{ |
571 |
if (available()) { |
|
572 |
_dc_and_los |= dc_claimed; |
|
573 |
return true; |
|
574 |
} |
|
575 |
return false; |
|
576 |
} |
|
577 |
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|
578 |
inline void ParallelCompactData::RegionData::add_live_obj(size_t words) |
1 | 579 |
{ |
580 |
assert(words <= (size_t)los_mask - live_obj_size(), "overflow"); |
|
581 |
Atomic::add((int) words, (volatile int*) &_dc_and_los); |
|
582 |
} |
|
583 |
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|
584 |
inline void ParallelCompactData::RegionData::set_highest_ref(HeapWord* addr) |
1 | 585 |
{ |
586 |
#ifdef ASSERT |
|
587 |
HeapWord* tmp = _highest_ref; |
|
588 |
while (addr > tmp) { |
|
589 |
tmp = (HeapWord*)Atomic::cmpxchg_ptr(addr, &_highest_ref, tmp); |
|
590 |
} |
|
591 |
#endif // #ifdef ASSERT |
|
592 |
} |
|
593 |
||
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|
594 |
inline bool ParallelCompactData::RegionData::claim() |
1 | 595 |
{ |
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|
596 |
const region_sz_t los = static_cast<region_sz_t>(live_obj_size()); |
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|
597 |
const region_sz_t old = Atomic::cmpxchg(dc_claimed | los, &_dc_and_los, los); |
1 | 598 |
return old == los; |
599 |
} |
|
600 |
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|
601 |
inline ParallelCompactData::RegionData* |
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|
602 |
ParallelCompactData::region(size_t region_idx) const |
1 | 603 |
{ |
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|
604 |
assert(region_idx <= region_count(), "bad arg"); |
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|
605 |
return _region_data + region_idx; |
1 | 606 |
} |
607 |
||
608 |
inline size_t |
|
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|
609 |
ParallelCompactData::region(const RegionData* const region_ptr) const |
1 | 610 |
{ |
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|
611 |
assert(region_ptr >= _region_data, "bad arg"); |
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changeset
|
612 |
assert(region_ptr <= _region_data + region_count(), "bad arg"); |
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|
613 |
return pointer_delta(region_ptr, _region_data, sizeof(RegionData)); |
1 | 614 |
} |
615 |
||
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|
616 |
inline ParallelCompactData::BlockData* |
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|
617 |
ParallelCompactData::block(size_t n) const { |
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|
618 |
assert(n < block_count(), "bad arg"); |
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|
619 |
return _block_data + n; |
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|
620 |
} |
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|
621 |
|
1 | 622 |
inline size_t |
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changeset
|
623 |
ParallelCompactData::region_offset(const HeapWord* addr) const |
1 | 624 |
{ |
625 |
assert(addr >= _region_start, "bad addr"); |
|
626 |
assert(addr <= _region_end, "bad addr"); |
|
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changeset
|
627 |
return (size_t(addr) & RegionAddrOffsetMask) >> LogHeapWordSize; |
1 | 628 |
} |
629 |
||
630 |
inline size_t |
|
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|
631 |
ParallelCompactData::addr_to_region_idx(const HeapWord* addr) const |
1 | 632 |
{ |
38149
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8154743: Internal Error: psParallelCompact.hpp assert(addr >= _region_start) failed: bad addr
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changeset
|
633 |
assert(addr >= _region_start, "bad addr " PTR_FORMAT " _region_start " PTR_FORMAT, p2i(addr), p2i(_region_start)); |
f0f1c01a930c
8154743: Internal Error: psParallelCompact.hpp assert(addr >= _region_start) failed: bad addr
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changeset
|
634 |
assert(addr <= _region_end, "bad addr " PTR_FORMAT " _region_end " PTR_FORMAT, p2i(addr), p2i(_region_end)); |
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|
635 |
return pointer_delta(addr, _region_start) >> Log2RegionSize; |
1 | 636 |
} |
637 |
||
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changeset
|
638 |
inline ParallelCompactData::RegionData* |
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|
639 |
ParallelCompactData::addr_to_region_ptr(const HeapWord* addr) const |
1 | 640 |
{ |
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changeset
|
641 |
return region(addr_to_region_idx(addr)); |
1 | 642 |
} |
643 |
||
644 |
inline HeapWord* |
|
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changeset
|
645 |
ParallelCompactData::region_to_addr(size_t region) const |
1 | 646 |
{ |
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changeset
|
647 |
assert(region <= _region_count, "region out of range"); |
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changeset
|
648 |
return _region_start + (region << Log2RegionSize); |
1 | 649 |
} |
650 |
||
651 |
inline HeapWord* |
|
1407
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changeset
|
652 |
ParallelCompactData::region_to_addr(const RegionData* region) const |
1 | 653 |
{ |
1407
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diff
changeset
|
654 |
return region_to_addr(pointer_delta(region, _region_data, |
9006b01ba3fd
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changeset
|
655 |
sizeof(RegionData))); |
1 | 656 |
} |
657 |
||
658 |
inline HeapWord* |
|
1407
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diff
changeset
|
659 |
ParallelCompactData::region_to_addr(size_t region, size_t offset) const |
1 | 660 |
{ |
1407
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diff
changeset
|
661 |
assert(region <= _region_count, "region out of range"); |
9006b01ba3fd
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diff
changeset
|
662 |
assert(offset < RegionSize, "offset too big"); // This may be too strict. |
9006b01ba3fd
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changeset
|
663 |
return region_to_addr(region) + offset; |
1 | 664 |
} |
665 |
||
666 |
inline HeapWord* |
|
1407
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changeset
|
667 |
ParallelCompactData::region_align_down(HeapWord* addr) const |
1 | 668 |
{ |
669 |
assert(addr >= _region_start, "bad addr"); |
|
1407
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diff
changeset
|
670 |
assert(addr < _region_end + RegionSize, "bad addr"); |
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changeset
|
671 |
return (HeapWord*)(size_t(addr) & RegionAddrMask); |
1 | 672 |
} |
673 |
||
674 |
inline HeapWord* |
|
1407
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changeset
|
675 |
ParallelCompactData::region_align_up(HeapWord* addr) const |
1 | 676 |
{ |
677 |
assert(addr >= _region_start, "bad addr"); |
|
678 |
assert(addr <= _region_end, "bad addr"); |
|
1407
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diff
changeset
|
679 |
return region_align_down(addr + RegionSizeOffsetMask); |
1 | 680 |
} |
681 |
||
682 |
inline bool |
|
1407
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diff
changeset
|
683 |
ParallelCompactData::is_region_aligned(HeapWord* addr) const |
1 | 684 |
{ |
1407
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diff
changeset
|
685 |
return region_offset(addr) == 0; |
1 | 686 |
} |
687 |
||
17851
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changeset
|
688 |
inline size_t |
04e698940f8a
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diff
changeset
|
689 |
ParallelCompactData::block_offset(const HeapWord* addr) const |
04e698940f8a
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diff
changeset
|
690 |
{ |
04e698940f8a
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diff
changeset
|
691 |
assert(addr >= _region_start, "bad addr"); |
04e698940f8a
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diff
changeset
|
692 |
assert(addr <= _region_end, "bad addr"); |
04e698940f8a
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diff
changeset
|
693 |
return (size_t(addr) & BlockAddrOffsetMask) >> LogHeapWordSize; |
04e698940f8a
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diff
changeset
|
694 |
} |
04e698940f8a
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diff
changeset
|
695 |
|
04e698940f8a
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diff
changeset
|
696 |
inline size_t |
04e698940f8a
6725714: par compact - add a table to speed up bitmap searches
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diff
changeset
|
697 |
ParallelCompactData::addr_to_block_idx(const HeapWord* addr) const |
04e698940f8a
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parents:
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diff
changeset
|
698 |
{ |
04e698940f8a
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diff
changeset
|
699 |
assert(addr >= _region_start, "bad addr"); |
04e698940f8a
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diff
changeset
|
700 |
assert(addr <= _region_end, "bad addr"); |
04e698940f8a
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diff
changeset
|
701 |
return pointer_delta(addr, _region_start) >> Log2BlockSize; |
04e698940f8a
6725714: par compact - add a table to speed up bitmap searches
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diff
changeset
|
702 |
} |
04e698940f8a
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diff
changeset
|
703 |
|
04e698940f8a
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diff
changeset
|
704 |
inline ParallelCompactData::BlockData* |
04e698940f8a
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changeset
|
705 |
ParallelCompactData::addr_to_block_ptr(const HeapWord* addr) const |
04e698940f8a
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changeset
|
706 |
{ |
04e698940f8a
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diff
changeset
|
707 |
return block(addr_to_block_idx(addr)); |
04e698940f8a
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parents:
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diff
changeset
|
708 |
} |
04e698940f8a
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diff
changeset
|
709 |
|
04e698940f8a
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diff
changeset
|
710 |
inline HeapWord* |
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diff
changeset
|
711 |
ParallelCompactData::block_to_addr(size_t block) const |
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diff
changeset
|
712 |
{ |
04e698940f8a
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changeset
|
713 |
assert(block < _block_count, "block out of range"); |
04e698940f8a
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changeset
|
714 |
return _region_start + (block << Log2BlockSize); |
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changeset
|
715 |
} |
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changeset
|
716 |
|
04e698940f8a
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changeset
|
717 |
inline size_t |
04e698940f8a
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changeset
|
718 |
ParallelCompactData::region_to_block_idx(size_t region) const |
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diff
changeset
|
719 |
{ |
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changeset
|
720 |
return region << Log2BlocksPerRegion; |
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changeset
|
721 |
} |
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changeset
|
722 |
|
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changeset
|
723 |
inline HeapWord* |
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changeset
|
724 |
ParallelCompactData::block_align_down(HeapWord* addr) const |
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changeset
|
725 |
{ |
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changeset
|
726 |
assert(addr >= _region_start, "bad addr"); |
04e698940f8a
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changeset
|
727 |
assert(addr < _region_end + RegionSize, "bad addr"); |
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|
728 |
return (HeapWord*)(size_t(addr) & BlockAddrMask); |
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|
729 |
} |
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|
730 |
|
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|
731 |
inline HeapWord* |
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|
732 |
ParallelCompactData::block_align_up(HeapWord* addr) const |
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|
733 |
{ |
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|
734 |
assert(addr >= _region_start, "bad addr"); |
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|
735 |
assert(addr <= _region_end, "bad addr"); |
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|
736 |
return block_align_down(addr + BlockSizeOffsetMask); |
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|
737 |
} |
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|
738 |
|
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|
739 |
inline bool |
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|
740 |
ParallelCompactData::is_block_aligned(HeapWord* addr) const |
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|
741 |
{ |
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changeset
|
742 |
return block_offset(addr) == 0; |
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changeset
|
743 |
} |
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|
744 |
|
1 | 745 |
// Abstract closure for use with ParMarkBitMap::iterate(), which will invoke the |
746 |
// do_addr() method. |
|
747 |
// |
|
748 |
// The closure is initialized with the number of heap words to process |
|
749 |
// (words_remaining()), and becomes 'full' when it reaches 0. The do_addr() |
|
750 |
// methods in subclasses should update the total as words are processed. Since |
|
751 |
// only one subclass actually uses this mechanism to terminate iteration, the |
|
752 |
// default initial value is > 0. The implementation is here and not in the |
|
753 |
// single subclass that uses it to avoid making is_full() virtual, and thus |
|
754 |
// adding a virtual call per live object. |
|
755 |
||
756 |
class ParMarkBitMapClosure: public StackObj { |
|
757 |
public: |
|
758 |
typedef ParMarkBitMap::idx_t idx_t; |
|
759 |
typedef ParMarkBitMap::IterationStatus IterationStatus; |
|
760 |
||
761 |
public: |
|
762 |
inline ParMarkBitMapClosure(ParMarkBitMap* mbm, ParCompactionManager* cm, |
|
763 |
size_t words = max_uintx); |
|
764 |
||
765 |
inline ParCompactionManager* compaction_manager() const; |
|
766 |
inline ParMarkBitMap* bitmap() const; |
|
767 |
inline size_t words_remaining() const; |
|
768 |
inline bool is_full() const; |
|
769 |
inline HeapWord* source() const; |
|
770 |
||
771 |
inline void set_source(HeapWord* addr); |
|
772 |
||
773 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words) = 0; |
|
774 |
||
775 |
protected: |
|
776 |
inline void decrement_words_remaining(size_t words); |
|
777 |
||
778 |
private: |
|
779 |
ParMarkBitMap* const _bitmap; |
|
780 |
ParCompactionManager* const _compaction_manager; |
|
781 |
DEBUG_ONLY(const size_t _initial_words_remaining;) // Useful in debugger. |
|
782 |
size_t _words_remaining; // Words left to copy. |
|
783 |
||
784 |
protected: |
|
785 |
HeapWord* _source; // Next addr that would be read. |
|
786 |
}; |
|
787 |
||
788 |
inline |
|
789 |
ParMarkBitMapClosure::ParMarkBitMapClosure(ParMarkBitMap* bitmap, |
|
790 |
ParCompactionManager* cm, |
|
791 |
size_t words): |
|
792 |
_bitmap(bitmap), _compaction_manager(cm) |
|
793 |
#ifdef ASSERT |
|
794 |
, _initial_words_remaining(words) |
|
795 |
#endif |
|
796 |
{ |
|
797 |
_words_remaining = words; |
|
798 |
_source = NULL; |
|
799 |
} |
|
800 |
||
801 |
inline ParCompactionManager* ParMarkBitMapClosure::compaction_manager() const { |
|
802 |
return _compaction_manager; |
|
803 |
} |
|
804 |
||
805 |
inline ParMarkBitMap* ParMarkBitMapClosure::bitmap() const { |
|
806 |
return _bitmap; |
|
807 |
} |
|
808 |
||
809 |
inline size_t ParMarkBitMapClosure::words_remaining() const { |
|
810 |
return _words_remaining; |
|
811 |
} |
|
812 |
||
813 |
inline bool ParMarkBitMapClosure::is_full() const { |
|
814 |
return words_remaining() == 0; |
|
815 |
} |
|
816 |
||
817 |
inline HeapWord* ParMarkBitMapClosure::source() const { |
|
818 |
return _source; |
|
819 |
} |
|
820 |
||
821 |
inline void ParMarkBitMapClosure::set_source(HeapWord* addr) { |
|
822 |
_source = addr; |
|
823 |
} |
|
824 |
||
825 |
inline void ParMarkBitMapClosure::decrement_words_remaining(size_t words) { |
|
826 |
assert(_words_remaining >= words, "processed too many words"); |
|
827 |
_words_remaining -= words; |
|
828 |
} |
|
829 |
||
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|
830 |
// The UseParallelOldGC collector is a stop-the-world garbage collector that |
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|
831 |
// does parts of the collection using parallel threads. The collection includes |
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|
832 |
// the tenured generation and the young generation. The permanent generation is |
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|
833 |
// collected at the same time as the other two generations but the permanent |
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changeset
|
834 |
// generation is collect by a single GC thread. The permanent generation is |
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|
835 |
// collected serially because of the requirement that during the processing of a |
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|
836 |
// klass AAA, any objects reference by AAA must already have been processed. |
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|
837 |
// This requirement is enforced by a left (lower address) to right (higher |
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|
838 |
// address) sliding compaction. |
971
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|
839 |
// |
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|
840 |
// There are four phases of the collection. |
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|
841 |
// |
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|
842 |
// - marking phase |
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|
843 |
// - summary phase |
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|
844 |
// - compacting phase |
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|
845 |
// - clean up phase |
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|
846 |
// |
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|
847 |
// Roughly speaking these phases correspond, respectively, to |
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|
848 |
// - mark all the live objects |
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|
849 |
// - calculate the destination of each object at the end of the collection |
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|
850 |
// - move the objects to their destination |
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|
851 |
// - update some references and reinitialize some variables |
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|
852 |
// |
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changeset
|
853 |
// These three phases are invoked in PSParallelCompact::invoke_no_policy(). The |
9006b01ba3fd
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parents:
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diff
changeset
|
854 |
// marking phase is implemented in PSParallelCompact::marking_phase() and does a |
9006b01ba3fd
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diff
changeset
|
855 |
// complete marking of the heap. The summary phase is implemented in |
9006b01ba3fd
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parents:
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diff
changeset
|
856 |
// PSParallelCompact::summary_phase(). The move and update phase is implemented |
9006b01ba3fd
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diff
changeset
|
857 |
// in PSParallelCompact::compact(). |
971
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|
858 |
// |
1407
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diff
changeset
|
859 |
// A space that is being collected is divided into regions and with each region |
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changeset
|
860 |
// is associated an object of type ParallelCompactData. Each region is of a |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
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diff
changeset
|
861 |
// fixed size and typically will contain more than 1 object and may have parts |
9006b01ba3fd
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parents:
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diff
changeset
|
862 |
// of objects at the front and back of the region. |
971
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diff
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|
863 |
// |
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diff
changeset
|
864 |
// region -----+---------------------+---------- |
971
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diff
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|
865 |
// objects covered [ AAA )[ BBB )[ CCC )[ DDD ) |
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|
866 |
// |
1407
9006b01ba3fd
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diff
changeset
|
867 |
// The marking phase does a complete marking of all live objects in the heap. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
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diff
changeset
|
868 |
// 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:
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diff
changeset
|
869 |
// by the region. This size includes the part of any live object spanning onto |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
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diff
changeset
|
870 |
// the region (part of AAA if it is live) from the front, all live objects |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
871 |
// 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
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parents:
977
diff
changeset
|
872 |
// any live objects covered by the region that extends off the region (part of |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
873 |
// DDD if it is live). The marking phase uses multiple GC threads and marking |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
874 |
// 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
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parents:
977
diff
changeset
|
875 |
// 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
|
876 |
// covered by a region. |
971
f0b20be4165d
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diff
changeset
|
877 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
878 |
// 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
|
879 |
// XXX. Based on that total and the bottom of the space, it can calculate the |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
880 |
// starting location of the live data in XXX. The summary phase calculates for |
22551 | 881 |
// each region XXX quantities such as |
971
f0b20be4165d
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diff
changeset
|
882 |
// |
1407
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diff
changeset
|
883 |
// - the amount of live data at the beginning of a region from an object |
9006b01ba3fd
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diff
changeset
|
884 |
// entering the region. |
9006b01ba3fd
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parents:
977
diff
changeset
|
885 |
// - the location of the first live data on the region |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
886 |
// - a count of the number of regions receiving live data from XXX. |
971
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diff
changeset
|
887 |
// |
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changeset
|
888 |
// See ParallelCompactData for precise details. The summary phase also |
1407
9006b01ba3fd
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977
diff
changeset
|
889 |
// calculates the dense prefix for the compaction. The dense prefix is a |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
890 |
// portion at the beginning of the space that is not moved. The objects in the |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
891 |
// dense prefix do need to have their object references updated. See method |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
892 |
// summarize_dense_prefix(). |
971
f0b20be4165d
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diff
changeset
|
893 |
// |
f0b20be4165d
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360
diff
changeset
|
894 |
// The summary phase is done using 1 GC thread. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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diff
changeset
|
895 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
896 |
// The compaction phase moves objects to their new location and updates all |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
897 |
// references in the object. |
971
f0b20be4165d
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360
diff
changeset
|
898 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
899 |
// A current exception is that objects that cross a region boundary are moved |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
900 |
// but do not have their references updated. References are not updated because |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
901 |
// it cannot easily be determined if the klass pointer KKK for the object AAA |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
902 |
// has been updated. KKK likely resides in a region to the left of the region |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
903 |
// containing AAA. These AAA's have there references updated at the end in a |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
904 |
// clean up phase. See the method PSParallelCompact::update_deferred_objects(). |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
905 |
// An alternate strategy is being investigated for this deferral of updating. |
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
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360
diff
changeset
|
906 |
// |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
907 |
// Compaction is done on a region basis. A region that is ready to be filled is |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
908 |
// put on a ready list and GC threads take region off the list and fill them. A |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
909 |
// region is ready to be filled if it empty of live objects. Such a region may |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
910 |
// have been initially empty (only contained dead objects) or may have had all |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
911 |
// its live objects copied out already. A region that compacts into itself is |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
912 |
// also ready for filling. The ready list is initially filled with empty |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
913 |
// regions and regions compacting into themselves. There is always at least 1 |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
914 |
// region that can be put on the ready list. The regions are atomically added |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
915 |
// and removed from the ready list. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
916 |
|
1 | 917 |
class PSParallelCompact : AllStatic { |
918 |
public: |
|
919 |
// Convenient access to type names. |
|
920 |
typedef ParMarkBitMap::idx_t idx_t; |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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977
diff
changeset
|
921 |
typedef ParallelCompactData::RegionData RegionData; |
17851
04e698940f8a
6725714: par compact - add a table to speed up bitmap searches
jcoomes
parents:
17627
diff
changeset
|
922 |
typedef ParallelCompactData::BlockData BlockData; |
1 | 923 |
|
924 |
typedef enum { |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
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diff
changeset
|
925 |
old_space_id, eden_space_id, |
1 | 926 |
from_space_id, to_space_id, last_space_id |
927 |
} SpaceId; |
|
928 |
||
929 |
public: |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
930 |
// Inline closure decls |
1 | 931 |
// |
932 |
class IsAliveClosure: public BoolObjectClosure { |
|
933 |
public: |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
934 |
virtual bool do_object_b(oop p); |
1 | 935 |
}; |
936 |
||
30150
d9c940aa42ef
8075955: Replace the macro based implementation of oop_oop_iterate with a template based solution
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parents:
29792
diff
changeset
|
937 |
class AdjustPointerClosure: public ExtendedOopClosure { |
1 | 938 |
public: |
35877
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
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parents:
35862
diff
changeset
|
939 |
AdjustPointerClosure(ParCompactionManager* cm) { |
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
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parents:
35862
diff
changeset
|
940 |
assert(cm != NULL, "associate ParCompactionManage should not be NULL"); |
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
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parents:
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diff
changeset
|
941 |
_cm = cm; |
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
35862
diff
changeset
|
942 |
} |
30150
d9c940aa42ef
8075955: Replace the macro based implementation of oop_oop_iterate with a template based solution
stefank
parents:
29792
diff
changeset
|
943 |
template <typename T> void do_oop_nv(T* p); |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
944 |
virtual void do_oop(oop* p); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
945 |
virtual void do_oop(narrowOop* p); |
30150
d9c940aa42ef
8075955: Replace the macro based implementation of oop_oop_iterate with a template based solution
stefank
parents:
29792
diff
changeset
|
946 |
|
d9c940aa42ef
8075955: Replace the macro based implementation of oop_oop_iterate with a template based solution
stefank
parents:
29792
diff
changeset
|
947 |
// This closure provides its own oop verification code. |
d9c940aa42ef
8075955: Replace the macro based implementation of oop_oop_iterate with a template based solution
stefank
parents:
29792
diff
changeset
|
948 |
debug_only(virtual bool should_verify_oops() { return false; }) |
35877
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
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parents:
35862
diff
changeset
|
949 |
private: |
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
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diff
changeset
|
950 |
ParCompactionManager* _cm; |
1 | 951 |
}; |
952 |
||
13728
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changeset
|
953 |
class AdjustKlassClosure : public KlassClosure { |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
954 |
public: |
35877
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
35862
diff
changeset
|
955 |
AdjustKlassClosure(ParCompactionManager* cm) { |
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
35862
diff
changeset
|
956 |
assert(cm != NULL, "associate ParCompactionManage should not be NULL"); |
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
35862
diff
changeset
|
957 |
_cm = cm; |
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
35862
diff
changeset
|
958 |
} |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
959 |
void do_klass(Klass* klass); |
35877
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
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parents:
35862
diff
changeset
|
960 |
private: |
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
35862
diff
changeset
|
961 |
ParCompactionManager* _cm; |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
962 |
}; |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
963 |
|
1 | 964 |
friend class AdjustPointerClosure; |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
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11757
diff
changeset
|
965 |
friend class AdjustKlassClosure; |
1 | 966 |
friend class RefProcTaskProxy; |
42638 | 967 |
friend class PSParallelCompactTest; |
1 | 968 |
|
969 |
private: |
|
18025 | 970 |
static STWGCTimer _gc_timer; |
971 |
static ParallelOldTracer _gc_tracer; |
|
1 | 972 |
static elapsedTimer _accumulated_time; |
973 |
static unsigned int _total_invocations; |
|
974 |
static unsigned int _maximum_compaction_gc_num; |
|
975 |
static jlong _time_of_last_gc; // ms |
|
976 |
static CollectorCounters* _counters; |
|
977 |
static ParMarkBitMap _mark_bitmap; |
|
978 |
static ParallelCompactData _summary_data; |
|
979 |
static IsAliveClosure _is_alive_closure; |
|
980 |
static SpaceInfo _space_info[last_space_id]; |
|
981 |
||
982 |
// Reference processing (used in ...follow_contents) |
|
983 |
static ReferenceProcessor* _ref_processor; |
|
984 |
||
985 |
// Values computed at initialization and used by dead_wood_limiter(). |
|
986 |
static double _dwl_mean; |
|
987 |
static double _dwl_std_dev; |
|
988 |
static double _dwl_first_term; |
|
989 |
static double _dwl_adjustment; |
|
990 |
#ifdef ASSERT |
|
991 |
static bool _dwl_initialized; |
|
992 |
#endif // #ifdef ASSERT |
|
993 |
||
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
22551
diff
changeset
|
994 |
public: |
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
22551
diff
changeset
|
995 |
static ParallelOldTracer* gc_tracer() { return &_gc_tracer; } |
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
22551
diff
changeset
|
996 |
|
1 | 997 |
private: |
998 |
||
999 |
static void initialize_space_info(); |
|
1000 |
||
1001 |
// Clear the marking bitmap and summary data that cover the specified space. |
|
1002 |
static void clear_data_covering_space(SpaceId id); |
|
1003 |
||
35061 | 1004 |
static void pre_compact(); |
1 | 1005 |
static void post_compact(); |
1006 |
||
1007 |
// Mark live objects |
|
1008 |
static void marking_phase(ParCompactionManager* cm, |
|
18025 | 1009 |
bool maximum_heap_compaction, |
1010 |
ParallelOldTracer *gc_tracer); |
|
1 | 1011 |
|
1012 |
// Compute the dense prefix for the designated space. This is an experimental |
|
1013 |
// implementation currently not used in production. |
|
1014 |
static HeapWord* compute_dense_prefix_via_density(const SpaceId id, |
|
1015 |
bool maximum_compaction); |
|
1016 |
||
1017 |
// Methods used to compute the dense prefix. |
|
1018 |
||
1019 |
// Compute the value of the normal distribution at x = density. The mean and |
|
1020 |
// standard deviation are values saved by initialize_dead_wood_limiter(). |
|
1021 |
static inline double normal_distribution(double density); |
|
1022 |
||
1023 |
// Initialize the static vars used by dead_wood_limiter(). |
|
1024 |
static void initialize_dead_wood_limiter(); |
|
1025 |
||
1026 |
// Return the percentage of space that can be treated as "dead wood" (i.e., |
|
1027 |
// not reclaimed). |
|
1028 |
static double dead_wood_limiter(double density, size_t min_percent); |
|
1029 |
||
1407
9006b01ba3fd
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jcoomes
parents:
977
diff
changeset
|
1030 |
// Find the first (left-most) region in the range [beg, end) that has at least |
1 | 1031 |
// dead_words of dead space to the left. The argument beg must be the first |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1032 |
// region in the space that is not completely live. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1033 |
static RegionData* dead_wood_limit_region(const RegionData* beg, |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1034 |
const RegionData* end, |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1035 |
size_t dead_words); |
1 | 1036 |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1037 |
// Return a pointer to the first region in the range [beg, end) that is not |
1 | 1038 |
// completely full. |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1039 |
static RegionData* first_dead_space_region(const RegionData* beg, |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1040 |
const RegionData* end); |
1 | 1041 |
|
1042 |
// Return a value indicating the benefit or 'yield' if the compacted region |
|
1043 |
// were to start (or equivalently if the dense prefix were to end) at the |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1044 |
// candidate region. Higher values are better. |
1 | 1045 |
// |
1046 |
// The value is based on the amount of space reclaimed vs. the costs of (a) |
|
1047 |
// updating references in the dense prefix plus (b) copying objects and |
|
1048 |
// updating references in the compacted region. |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1049 |
static inline double reclaimed_ratio(const RegionData* const candidate, |
1 | 1050 |
HeapWord* const bottom, |
1051 |
HeapWord* const top, |
|
1052 |
HeapWord* const new_top); |
|
1053 |
||
1054 |
// Compute the dense prefix for the designated space. |
|
1055 |
static HeapWord* compute_dense_prefix(const SpaceId id, |
|
1056 |
bool maximum_compaction); |
|
1057 |
||
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1058 |
// Return true if dead space crosses onto the specified Region; bit must be |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1059 |
// the bit index corresponding to the first word of the Region. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1060 |
static inline bool dead_space_crosses_boundary(const RegionData* region, |
1 | 1061 |
idx_t bit); |
1062 |
||
1063 |
// Summary phase utility routine to fill dead space (if any) at the dense |
|
1064 |
// prefix boundary. Should only be called if the the dense prefix is |
|
1065 |
// non-empty. |
|
1066 |
static void fill_dense_prefix_end(SpaceId id); |
|
1067 |
||
1068 |
static void summarize_spaces_quick(); |
|
1069 |
static void summarize_space(SpaceId id, bool maximum_compaction); |
|
1070 |
static void summary_phase(ParCompactionManager* cm, bool maximum_compaction); |
|
1071 |
||
1072 |
// Adjust addresses in roots. Does not adjust addresses in heap. |
|
35877
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
35862
diff
changeset
|
1073 |
static void adjust_roots(ParCompactionManager* cm); |
1 | 1074 |
|
35061 | 1075 |
DEBUG_ONLY(static void write_block_fill_histogram();) |
17851
04e698940f8a
6725714: par compact - add a table to speed up bitmap searches
jcoomes
parents:
17627
diff
changeset
|
1076 |
|
1 | 1077 |
// Move objects to new locations. |
1078 |
static void compact_perm(ParCompactionManager* cm); |
|
1079 |
static void compact(); |
|
1080 |
||
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1081 |
// Add available regions to the stack and draining tasks to the task queue. |
38170
ff88a25a7799
8150994: UseParallelGC fails with UseDynamicNumberOfGCThreads with specjbb2005
jmasa
parents:
38149
diff
changeset
|
1082 |
static void prepare_region_draining_tasks(GCTaskQueue* q, |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1083 |
uint parallel_gc_threads); |
1 | 1084 |
|
1085 |
// Add dense prefix update tasks to the task queue. |
|
1086 |
static void enqueue_dense_prefix_tasks(GCTaskQueue* q, |
|
1087 |
uint parallel_gc_threads); |
|
1088 |
||
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1089 |
// Add region stealing tasks to the task queue. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1090 |
static void enqueue_region_stealing_tasks( |
1 | 1091 |
GCTaskQueue* q, |
1092 |
ParallelTaskTerminator* terminator_ptr, |
|
1093 |
uint parallel_gc_threads); |
|
1094 |
||
1095 |
// If objects are left in eden after a collection, try to move the boundary |
|
1096 |
// and absorb them into the old gen. Returns true if eden was emptied. |
|
1097 |
static bool absorb_live_data_from_eden(PSAdaptiveSizePolicy* size_policy, |
|
1098 |
PSYoungGen* young_gen, |
|
1099 |
PSOldGen* old_gen); |
|
1100 |
||
1101 |
// Reset time since last full gc |
|
1102 |
static void reset_millis_since_last_gc(); |
|
1103 |
||
42638 | 1104 |
#ifndef PRODUCT |
1105 |
// Print generic summary data |
|
1106 |
static void print_generic_summary_data(ParallelCompactData& summary_data, |
|
1107 |
HeapWord* const beg_addr, |
|
1108 |
HeapWord* const end_addr); |
|
1109 |
#endif // #ifndef PRODUCT |
|
1110 |
||
1 | 1111 |
public: |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
1112 |
|
1 | 1113 |
PSParallelCompact(); |
1114 |
||
1115 |
static void invoke(bool maximum_heap_compaction); |
|
11757
cdf6204b114a
7146343: PS invoke methods should indicate the type of gc done
jcoomes
parents:
11178
diff
changeset
|
1116 |
static bool invoke_no_policy(bool maximum_heap_compaction); |
1 | 1117 |
|
1118 |
static void post_initialize(); |
|
1119 |
// Perform initialization for PSParallelCompact that requires |
|
1120 |
// allocations. This should be called during the VM initialization |
|
1121 |
// at a pointer where it would be appropriate to return a JNI_ENOMEM |
|
1122 |
// in the event of a failure. |
|
1123 |
static bool initialize(); |
|
1124 |
||
13728
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6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
1125 |
// Closure accessors |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
1126 |
static BoolObjectClosure* is_alive_closure() { return (BoolObjectClosure*)&_is_alive_closure; } |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
1127 |
|
1 | 1128 |
// Public accessors |
1129 |
static elapsedTimer* accumulated_time() { return &_accumulated_time; } |
|
1130 |
static unsigned int total_invocations() { return _total_invocations; } |
|
1131 |
static CollectorCounters* counters() { return _counters; } |
|
1132 |
||
1133 |
// Used to add tasks |
|
1134 |
static GCTaskManager* const gc_task_manager(); |
|
1135 |
||
1136 |
// Marking support |
|
1137 |
static inline bool mark_obj(oop obj); |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
11757
diff
changeset
|
1138 |
static inline bool is_marked(oop obj); |
30556
750fee2bdb45
8078345: Move PSParallelCompact::mark_and_push to ParCompactionManager
stefank
parents:
30555
diff
changeset
|
1139 |
|
35877
a2a62511d0f8
8146987: Improve Parallel GC Full GC by caching results of live_words_in_range()
tschatzl
parents:
35862
diff
changeset
|
1140 |
template <class T> static inline void adjust_pointer(T* p, ParCompactionManager* cm); |
1 | 1141 |
|
1142 |
// Compaction support. |
|
1143 |
// Return true if p is in the range [beg_addr, end_addr). |
|
1144 |
static inline bool is_in(HeapWord* p, HeapWord* beg_addr, HeapWord* end_addr); |
|
1145 |
static inline bool is_in(oop* p, HeapWord* beg_addr, HeapWord* end_addr); |
|
1146 |
||
1147 |
// Convenience wrappers for per-space data kept in _space_info. |
|
1148 |
static inline MutableSpace* space(SpaceId space_id); |
|
1149 |
static inline HeapWord* new_top(SpaceId space_id); |
|
1150 |
static inline HeapWord* dense_prefix(SpaceId space_id); |
|
1151 |
static inline ObjectStartArray* start_array(SpaceId space_id); |
|
1152 |
||
1153 |
// Move and update the live objects in the specified space. |
|
1154 |
static void move_and_update(ParCompactionManager* cm, SpaceId space_id); |
|
1155 |
||
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|
1156 |
// Process the end of the given region range in the dense prefix. |
1 | 1157 |
// This includes saving any object not updated. |
1407
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|
1158 |
static void dense_prefix_regions_epilogue(ParCompactionManager* cm, |
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changeset
|
1159 |
size_t region_start_index, |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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changeset
|
1160 |
size_t region_end_index, |
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changeset
|
1161 |
idx_t exiting_object_offset, |
9006b01ba3fd
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diff
changeset
|
1162 |
idx_t region_offset_start, |
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6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
1163 |
idx_t region_offset_end); |
1 | 1164 |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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changeset
|
1165 |
// Update a region in the dense prefix. For each live object |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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changeset
|
1166 |
// in the region, update it's interior references. For each |
1 | 1167 |
// dead object, fill it with deadwood. Dead space at the end |
1407
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diff
changeset
|
1168 |
// of a region range will be filled to the start of the next |
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changeset
|
1169 |
// live object regardless of the region_index_end. None of the |
1 | 1170 |
// objects in the dense prefix move and dead space is dead |
1171 |
// (holds only dead objects that don't need any processing), so |
|
1172 |
// dead space can be filled in any order. |
|
1173 |
static void update_and_deadwood_in_dense_prefix(ParCompactionManager* cm, |
|
1174 |
SpaceId space_id, |
|
1407
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diff
changeset
|
1175 |
size_t region_index_start, |
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changeset
|
1176 |
size_t region_index_end); |
1 | 1177 |
|
1178 |
// Return the address of the count + 1st live word in the range [beg, end). |
|
1179 |
static HeapWord* skip_live_words(HeapWord* beg, HeapWord* end, size_t count); |
|
1180 |
||
1181 |
// Return the address of the word to be copied to dest_addr, which must be |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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977
diff
changeset
|
1182 |
// aligned to a region boundary. |
1 | 1183 |
static HeapWord* first_src_addr(HeapWord* const dest_addr, |
1669
c921639400dd
6765745: par compact - allow young gen spaces to be split
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parents:
1668
diff
changeset
|
1184 |
SpaceId src_space_id, |
1407
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6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
1185 |
size_t src_region_idx); |
1 | 1186 |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
parents:
977
diff
changeset
|
1187 |
// Determine the next source region, set closure.source() to the start of the |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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977
diff
changeset
|
1188 |
// new region return the region index. Parameter end_addr is the address one |
1 | 1189 |
// beyond the end of source range just processed. If necessary, switch to a |
1190 |
// new source space and set src_space_id (in-out parameter) and src_space_top |
|
1191 |
// (out parameter) accordingly. |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
1192 |
static size_t next_src_region(MoveAndUpdateClosure& closure, |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
1193 |
SpaceId& src_space_id, |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
1194 |
HeapWord*& src_space_top, |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
1195 |
HeapWord* end_addr); |
1 | 1196 |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
1197 |
// Decrement the destination count for each non-empty source region in the |
1682
94ad5692b3a7
6784849: par compact - can fail when to_space is non-empty
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diff
changeset
|
1198 |
// range [beg_region, region(region_align_up(end_addr))). If the destination |
94ad5692b3a7
6784849: par compact - can fail when to_space is non-empty
jcoomes
parents:
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diff
changeset
|
1199 |
// count for a region goes to 0 and it needs to be filled, enqueue it. |
1 | 1200 |
static void decrement_destination_counts(ParCompactionManager* cm, |
1682
94ad5692b3a7
6784849: par compact - can fail when to_space is non-empty
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diff
changeset
|
1201 |
SpaceId src_space_id, |
1407
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6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
1202 |
size_t beg_region, |
1 | 1203 |
HeapWord* end_addr); |
1204 |
||
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
1205 |
// Fill a region, copying objects from one or more source regions. |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
1206 |
static void fill_region(ParCompactionManager* cm, size_t region_idx); |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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diff
changeset
|
1207 |
static void fill_and_update_region(ParCompactionManager* cm, size_t region) { |
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
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parents:
977
diff
changeset
|
1208 |
fill_region(cm, region); |
1 | 1209 |
} |
1210 |
||
17851
04e698940f8a
6725714: par compact - add a table to speed up bitmap searches
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17627
diff
changeset
|
1211 |
// Fill in the block table for the specified region. |
04e698940f8a
6725714: par compact - add a table to speed up bitmap searches
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parents:
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diff
changeset
|
1212 |
static void fill_blocks(size_t region_idx); |
04e698940f8a
6725714: par compact - add a table to speed up bitmap searches
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17627
diff
changeset
|
1213 |
|
1 | 1214 |
// Update the deferred objects in the space. |
1215 |
static void update_deferred_objects(ParCompactionManager* cm, SpaceId id); |
|
1216 |
||
1217 |
static ParMarkBitMap* mark_bitmap() { return &_mark_bitmap; } |
|
1218 |
static ParallelCompactData& summary_data() { return _summary_data; } |
|
1219 |
||
1220 |
// Reference Processing |
|
1221 |
static ReferenceProcessor* const ref_processor() { return _ref_processor; } |
|
1222 |
||
18025 | 1223 |
static STWGCTimer* gc_timer() { return &_gc_timer; } |
1224 |
||
1 | 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 |
||
16685
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
15088
diff
changeset
|
1231 |
static void print_on_error(outputStream* st); |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
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15088
diff
changeset
|
1232 |
|
1 | 1233 |
#ifndef PRODUCT |
1234 |
// Debugging support. |
|
1235 |
static const char* space_names[last_space_id]; |
|
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
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977
diff
changeset
|
1236 |
static void print_region_ranges(); |
1 | 1237 |
static void print_dense_prefix_stats(const char* const algorithm, |
1238 |
const SpaceId id, |
|
1239 |
const bool maximum_compaction, |
|
1240 |
HeapWord* const addr); |
|
1669
c921639400dd
6765745: par compact - allow young gen spaces to be split
jcoomes
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1668
diff
changeset
|
1241 |
static void summary_phase_msg(SpaceId dst_space_id, |
c921639400dd
6765745: par compact - allow young gen spaces to be split
jcoomes
parents:
1668
diff
changeset
|
1242 |
HeapWord* dst_beg, HeapWord* dst_end, |
c921639400dd
6765745: par compact - allow young gen spaces to be split
jcoomes
parents:
1668
diff
changeset
|
1243 |
SpaceId src_space_id, |
c921639400dd
6765745: par compact - allow young gen spaces to be split
jcoomes
parents:
1668
diff
changeset
|
1244 |
HeapWord* src_beg, HeapWord* src_end); |
1 | 1245 |
#endif // #ifndef PRODUCT |
1246 |
||
1247 |
#ifdef ASSERT |
|
1682
94ad5692b3a7
6784849: par compact - can fail when to_space is non-empty
jcoomes
parents:
1670
diff
changeset
|
1248 |
// Sanity check the new location of a word in the heap. |
94ad5692b3a7
6784849: par compact - can fail when to_space is non-empty
jcoomes
parents:
1670
diff
changeset
|
1249 |
static inline void check_new_location(HeapWord* old_addr, HeapWord* new_addr); |
1407
9006b01ba3fd
6725697: par compact - rename class ChunkData to RegionData
jcoomes
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977
diff
changeset
|
1250 |
// Verify that all the regions have been emptied. |
1 | 1251 |
static void verify_complete(SpaceId space_id); |
1252 |
#endif // #ifdef ASSERT |
|
1253 |
}; |
|
1254 |
||
1255 |
class MoveAndUpdateClosure: public ParMarkBitMapClosure { |
|
1256 |
public: |
|
1257 |
inline MoveAndUpdateClosure(ParMarkBitMap* bitmap, ParCompactionManager* cm, |
|
1258 |
ObjectStartArray* start_array, |
|
1259 |
HeapWord* destination, size_t words); |
|
1260 |
||
1261 |
// Accessors. |
|
1262 |
HeapWord* destination() const { return _destination; } |
|
1263 |
||
1264 |
// If the object will fit (size <= words_remaining()), copy it to the current |
|
1265 |
// destination, update the interior oops and the start array and return either |
|
1266 |
// full (if the closure is full) or incomplete. If the object will not fit, |
|
1267 |
// return would_overflow. |
|
1268 |
virtual IterationStatus do_addr(HeapWord* addr, size_t size); |
|
1269 |
||
1270 |
// Copy enough words to fill this closure, starting at source(). Interior |
|
1271 |
// oops and the start array are not updated. Return full. |
|
1272 |
IterationStatus copy_until_full(); |
|
1273 |
||
1274 |
// Copy enough words to fill this closure or to the end of an object, |
|
1275 |
// whichever is smaller, starting at source(). Interior oops and the start |
|
1276 |
// array are not updated. |
|
1277 |
void copy_partial_obj(); |
|
1278 |
||
1279 |
protected: |
|
1280 |
// Update variables to indicate that word_count words were processed. |
|
1281 |
inline void update_state(size_t word_count); |
|
1282 |
||
1283 |
protected: |
|
1284 |
ObjectStartArray* const _start_array; |
|
1285 |
HeapWord* _destination; // Next addr to be written. |
|
1286 |
}; |
|
1287 |
||
1288 |
inline |
|
1289 |
MoveAndUpdateClosure::MoveAndUpdateClosure(ParMarkBitMap* bitmap, |
|
1290 |
ParCompactionManager* cm, |
|
1291 |
ObjectStartArray* start_array, |
|
1292 |
HeapWord* destination, |
|
1293 |
size_t words) : |
|
1294 |
ParMarkBitMapClosure(bitmap, cm, words), _start_array(start_array) |
|
1295 |
{ |
|
1296 |
_destination = destination; |
|
1297 |
} |
|
1298 |
||
1299 |
inline void MoveAndUpdateClosure::update_state(size_t words) |
|
1300 |
{ |
|
1301 |
decrement_words_remaining(words); |
|
1302 |
_source += words; |
|
1303 |
_destination += words; |
|
1304 |
} |
|
1305 |
||
1306 |
class UpdateOnlyClosure: public ParMarkBitMapClosure { |
|
1307 |
private: |
|
1308 |
const PSParallelCompact::SpaceId _space_id; |
|
1309 |
ObjectStartArray* const _start_array; |
|
1310 |
||
1311 |
public: |
|
1312 |
UpdateOnlyClosure(ParMarkBitMap* mbm, |
|
1313 |
ParCompactionManager* cm, |
|
1314 |
PSParallelCompact::SpaceId space_id); |
|
1315 |
||
1316 |
// Update the object. |
|
1317 |
virtual IterationStatus do_addr(HeapWord* addr, size_t words); |
|
1318 |
||
1319 |
inline void do_addr(HeapWord* addr); |
|
1320 |
}; |
|
1321 |
||
35862
411842d0c882
8146395: Add inline qualifier in oop.hpp and fix inlining in gc files
goetz
parents:
35061
diff
changeset
|
1322 |
class FillClosure: public ParMarkBitMapClosure { |
411842d0c882
8146395: Add inline qualifier in oop.hpp and fix inlining in gc files
goetz
parents:
35061
diff
changeset
|
1323 |
public: |
46502
116a09d8f142
8180755: Remove use of bitMap.inline.hpp include from instanceKlass.hpp and c1_ValueSet.hpp
tschatzl
parents:
42638
diff
changeset
|
1324 |
FillClosure(ParCompactionManager* cm, PSParallelCompact::SpaceId space_id); |
1 | 1325 |
|
35862
411842d0c882
8146395: Add inline qualifier in oop.hpp and fix inlining in gc files
goetz
parents:
35061
diff
changeset
|
1326 |
virtual IterationStatus do_addr(HeapWord* addr, size_t size); |
1 | 1327 |
|
35862
411842d0c882
8146395: Add inline qualifier in oop.hpp and fix inlining in gc files
goetz
parents:
35061
diff
changeset
|
1328 |
private: |
1668
8ec481b8f514
6578152: fill_region_with_object has usability and safety issues
jcoomes
parents:
1408
diff
changeset
|
1329 |
ObjectStartArray* const _start_array; |
1 | 1330 |
}; |
7397 | 1331 |
|
30764 | 1332 |
#endif // SHARE_VM_GC_PARALLEL_PSPARALLELCOMPACT_HPP |