author | mgronlun |
Sat, 24 Aug 2019 14:30:27 +0200 | |
branch | JEP-349-branch |
changeset 57870 | 00860d9caf4d |
child 57983 | a57907813a83 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "gc/shared/collectedHeap.hpp" |
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#include "jfr/leakprofiler/leakProfiler.hpp" |
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#include "jfr/leakprofiler/chains/bfsClosure.hpp" |
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#include "jfr/leakprofiler/chains/bitset.hpp" |
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#include "jfr/leakprofiler/chains/dfsClosure.hpp" |
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#include "jfr/leakprofiler/chains/edge.hpp" |
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#include "jfr/leakprofiler/chains/edgeQueue.hpp" |
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#include "jfr/leakprofiler/chains/edgeStore.hpp" |
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#include "jfr/leakprofiler/chains/objectSampleMarker.hpp" |
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#include "jfr/leakprofiler/chains/rootSetClosure.hpp" |
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#include "jfr/leakprofiler/chains/edgeStore.hpp" |
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#include "jfr/leakprofiler/chains/objectSampleMarker.hpp" |
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#include "jfr/leakprofiler/chains/pathToGcRootsOperation.hpp" |
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#include "jfr/leakprofiler/checkpoint/eventEmitter.hpp" |
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#include "jfr/leakprofiler/checkpoint/objectSampleCheckpoint.hpp" |
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#include "jfr/leakprofiler/sampling/objectSample.hpp" |
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#include "jfr/leakprofiler/sampling/objectSampler.hpp" |
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#include "jfr/leakprofiler/utilities/granularTimer.hpp" |
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#include "logging/log.hpp" |
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#include "memory/universe.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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PathToGcRootsOperation::PathToGcRootsOperation(ObjectSampler* sampler, EdgeStore* edge_store, int64_t cutoff, bool emit_all) : |
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_sampler(sampler),_edge_store(edge_store), _cutoff_ticks(cutoff), _emit_all(emit_all) {} |
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/* The EdgeQueue is backed by directly managed virtual memory. |
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* We will attempt to dimension an initial reservation |
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* in proportion to the size of the heap (represented by heap_region). |
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* Initial memory reservation: 5% of the heap OR at least 32 Mb |
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* Commit ratio: 1 : 10 (subject to allocation granularties) |
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*/ |
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static size_t edge_queue_memory_reservation(const MemRegion& heap_region) { |
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const size_t memory_reservation_bytes = MAX2(heap_region.byte_size() / 20, 32*M); |
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assert(memory_reservation_bytes >= (size_t)32*M, "invariant"); |
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return memory_reservation_bytes; |
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} |
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static size_t edge_queue_memory_commit_size(size_t memory_reservation_bytes) { |
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const size_t memory_commit_block_size_bytes = memory_reservation_bytes / 10; |
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assert(memory_commit_block_size_bytes >= (size_t)3*M, "invariant"); |
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return memory_commit_block_size_bytes; |
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} |
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static void log_edge_queue_summary(const EdgeQueue& edge_queue) { |
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log_trace(jfr, system)("EdgeQueue reserved size total: " SIZE_FORMAT " [KB]", edge_queue.reserved_size() / K); |
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log_trace(jfr, system)("EdgeQueue edges total: " SIZE_FORMAT, edge_queue.top()); |
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log_trace(jfr, system)("EdgeQueue liveset total: " SIZE_FORMAT " [KB]", edge_queue.live_set() / K); |
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if (edge_queue.reserved_size() > 0) { |
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log_trace(jfr, system)("EdgeQueue commit reserve ratio: %f\n", |
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((double)edge_queue.live_set() / (double)edge_queue.reserved_size())); |
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} |
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} |
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void PathToGcRootsOperation::doit() { |
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assert(SafepointSynchronize::is_at_safepoint(), "invariant"); |
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assert(_cutoff_ticks > 0, "invariant"); |
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// The bitset used for marking is dimensioned as a function of the heap size |
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const MemRegion heap_region = Universe::heap()->reserved_region(); |
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BitSet mark_bits(heap_region); |
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// The edge queue is dimensioned as a fraction of the heap size |
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const size_t edge_queue_reservation_size = edge_queue_memory_reservation(heap_region); |
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EdgeQueue edge_queue(edge_queue_reservation_size, edge_queue_memory_commit_size(edge_queue_reservation_size)); |
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// The initialize() routines will attempt to reserve and allocate backing storage memory. |
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// Failure to accommodate will render root chain processing impossible. |
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// As a fallback on failure, just write out the existing samples, flat, without chains. |
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New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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97 |
if (!(mark_bits.initialize() && edge_queue.initialize())) { |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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98 |
log_warning(jfr)("Unable to allocate memory for root chain processing"); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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99 |
return; |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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100 |
} |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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101 |
|
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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102 |
// Save the original markWord for the potential leak objects, |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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103 |
// to be restored on function exit |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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104 |
ObjectSampleMarker marker; |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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105 |
if (ObjectSampleCheckpoint::save_mark_words(_sampler, marker, _emit_all) == 0) { |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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106 |
// no valid samples to process |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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107 |
return; |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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108 |
} |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
parents:
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|
109 |
|
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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110 |
// Necessary condition for attempting a root set iteration |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
parents:
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111 |
Universe::heap()->ensure_parsability(false); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
parents:
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112 |
|
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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|
113 |
BFSClosure bfs(&edge_queue, _edge_store, &mark_bits); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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114 |
RootSetClosure<BFSClosure> roots(&bfs); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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115 |
|
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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116 |
GranularTimer::start(_cutoff_ticks, 1000000); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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117 |
roots.process(); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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118 |
if (edge_queue.is_full()) { |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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119 |
// Pathological case where roots don't fit in queue |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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120 |
// Do a depth-first search, but mark roots first |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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121 |
// to avoid walking sideways over roots |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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|
122 |
DFSClosure::find_leaks_from_root_set(_edge_store, &mark_bits); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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|
123 |
} else { |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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|
124 |
bfs.process(); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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125 |
} |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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|
126 |
GranularTimer::stop(); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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|
127 |
log_edge_queue_summary(edge_queue); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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|
128 |
|
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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|
129 |
// Emit old objects including their reference chains as events |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
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|
130 |
EventEmitter emitter(GranularTimer::start_time(), GranularTimer::end_time()); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
mgronlun
parents:
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|
131 |
emitter.write_events(_sampler, _edge_store, _emit_all); |
00860d9caf4d
New metadata system for oldobjects built on top of simplified tagging model. Caching and serialization improvements. Flushpoint checkpoint with chunkheader contents.
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|
132 |
} |