author | kbarrett |
Thu, 23 Apr 2015 11:26:32 -0400 | |
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/* |
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* Copyright (c) 2001, 2015, 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_MEMORY_REFERENCEPROCESSOR_HPP |
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#define SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP |
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#include "gc_implementation/shared/gcTrace.hpp" |
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#include "memory/referencePolicy.hpp" |
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#include "memory/referenceProcessorStats.hpp" |
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#include "memory/referenceType.hpp" |
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#include "oops/instanceRefKlass.hpp" |
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class GCTimer; |
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// ReferenceProcessor class encapsulates the per-"collector" processing |
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// of java.lang.Reference objects for GC. The interface is useful for supporting |
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// a generational abstraction, in particular when there are multiple |
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// generations that are being independently collected -- possibly |
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// concurrently and/or incrementally. Note, however, that the |
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// ReferenceProcessor class abstracts away from a generational setting |
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// by using only a heap interval (called "span" below), thus allowing |
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// its use in a straightforward manner in a general, non-generational |
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// setting. |
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// |
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// The basic idea is that each ReferenceProcessor object concerns |
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// itself with ("weak") reference processing in a specific "span" |
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// of the heap of interest to a specific collector. Currently, |
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// the span is a convex interval of the heap, but, efficiency |
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// apart, there seems to be no reason it couldn't be extended |
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// (with appropriate modifications) to any "non-convex interval". |
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// forward references |
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class ReferencePolicy; |
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class AbstractRefProcTaskExecutor; |
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// List of discovered references. |
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class DiscoveredList { |
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public: |
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DiscoveredList() : _len(0), _compressed_head(0), _oop_head(NULL) { } |
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oop head() const { |
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return UseCompressedOops ? oopDesc::decode_heap_oop(_compressed_head) : |
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_oop_head; |
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} |
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HeapWord* adr_head() { |
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return UseCompressedOops ? (HeapWord*)&_compressed_head : |
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(HeapWord*)&_oop_head; |
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} |
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void set_head(oop o) { |
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if (UseCompressedOops) { |
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// Must compress the head ptr. |
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_compressed_head = oopDesc::encode_heap_oop(o); |
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} else { |
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_oop_head = o; |
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} |
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} |
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bool is_empty() const { return head() == NULL; } |
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size_t length() { return _len; } |
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void set_length(size_t len) { _len = len; } |
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void inc_length(size_t inc) { _len += inc; assert(_len > 0, "Error"); } |
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void dec_length(size_t dec) { _len -= dec; } |
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private: |
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// Set value depending on UseCompressedOops. This could be a template class |
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// but then we have to fix all the instantiations and declarations that use this class. |
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oop _oop_head; |
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narrowOop _compressed_head; |
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size_t _len; |
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}; |
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// Iterator for the list of discovered references. |
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class DiscoveredListIterator { |
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private: |
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DiscoveredList& _refs_list; |
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HeapWord* _prev_next; |
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oop _prev; |
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oop _ref; |
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HeapWord* _discovered_addr; |
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oop _next; |
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HeapWord* _referent_addr; |
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oop _referent; |
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OopClosure* _keep_alive; |
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BoolObjectClosure* _is_alive; |
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DEBUG_ONLY( |
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oop _first_seen; // cyclic linked list check |
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) |
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NOT_PRODUCT( |
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size_t _processed; |
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size_t _removed; |
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) |
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public: |
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inline DiscoveredListIterator(DiscoveredList& refs_list, |
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OopClosure* keep_alive, |
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BoolObjectClosure* is_alive): |
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_refs_list(refs_list), |
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_prev_next(refs_list.adr_head()), |
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_prev(NULL), |
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_ref(refs_list.head()), |
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#ifdef ASSERT |
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_first_seen(refs_list.head()), |
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#endif |
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#ifndef PRODUCT |
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_processed(0), |
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_removed(0), |
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#endif |
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_next(NULL), |
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_keep_alive(keep_alive), |
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_is_alive(is_alive) |
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{ } |
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// End Of List. |
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inline bool has_next() const { return _ref != NULL; } |
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// Get oop to the Reference object. |
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inline oop obj() const { return _ref; } |
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// Get oop to the referent object. |
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inline oop referent() const { return _referent; } |
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// Returns true if referent is alive. |
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inline bool is_referent_alive() const { |
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return _is_alive->do_object_b(_referent); |
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} |
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// Loads data for the current reference. |
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// The "allow_null_referent" argument tells us to allow for the possibility |
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// of a NULL referent in the discovered Reference object. This typically |
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// happens in the case of concurrent collectors that may have done the |
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// discovery concurrently, or interleaved, with mutator execution. |
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void load_ptrs(DEBUG_ONLY(bool allow_null_referent)); |
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// Move to the next discovered reference. |
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inline void next() { |
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_prev_next = _discovered_addr; |
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_prev = _ref; |
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move_to_next(); |
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} |
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// Remove the current reference from the list |
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void remove(); |
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|
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// Make the referent alive. |
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inline void make_referent_alive() { |
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if (UseCompressedOops) { |
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_keep_alive->do_oop((narrowOop*)_referent_addr); |
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} else { |
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_keep_alive->do_oop((oop*)_referent_addr); |
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} |
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} |
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|
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// NULL out referent pointer. |
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void clear_referent(); |
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|
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// Statistics |
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NOT_PRODUCT( |
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inline size_t processed() const { return _processed; } |
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inline size_t removed() const { return _removed; } |
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180 |
) |
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181 |
|
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inline void move_to_next() { |
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if (_ref == _next) { |
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// End of the list. |
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_ref = NULL; |
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} else { |
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_ref = _next; |
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} |
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assert(_ref != _first_seen, "cyclic ref_list found"); |
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NOT_PRODUCT(_processed++); |
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} |
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}; |
1 | 193 |
|
13195 | 194 |
class ReferenceProcessor : public CHeapObj<mtGC> { |
18025 | 195 |
|
196 |
private: |
|
197 |
size_t total_count(DiscoveredList lists[]); |
|
198 |
||
1 | 199 |
protected: |
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// The SoftReference master timestamp clock |
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static jlong _soft_ref_timestamp_clock; |
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202 |
|
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MemRegion _span; // (right-open) interval of heap |
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// subject to wkref discovery |
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205 |
|
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bool _discovering_refs; // true when discovery enabled |
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bool _discovery_is_atomic; // if discovery is atomic wrt |
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// other collectors in configuration |
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bool _discovery_is_mt; // true if reference discovery is MT. |
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210 |
|
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bool _enqueuing_is_done; // true if all weak references enqueued |
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bool _processing_is_mt; // true during phases when |
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// reference processing is MT. |
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uint _next_id; // round-robin mod _num_q counter in |
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// support of work distribution |
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216 |
|
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// For collectors that do not keep GC liveness information |
1 | 218 |
// in the object header, this field holds a closure that |
219 |
// helps the reference processor determine the reachability |
|
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// of an oop. It is currently initialized to NULL for all |
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// collectors except for CMS and G1. |
1 | 222 |
BoolObjectClosure* _is_alive_non_header; |
223 |
||
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// Soft ref clearing policies |
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// . the default policy |
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static ReferencePolicy* _default_soft_ref_policy; |
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// . the "clear all" policy |
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static ReferencePolicy* _always_clear_soft_ref_policy; |
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// . the current policy below is either one of the above |
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ReferencePolicy* _current_soft_ref_policy; |
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231 |
|
1 | 232 |
// The discovered ref lists themselves |
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233 |
|
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// The active MT'ness degree of the queues below |
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uint _num_q; |
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236 |
// The maximum MT'ness degree of the queues below |
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uint _max_num_q; |
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238 |
|
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239 |
// Master array of discovered oops |
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240 |
DiscoveredList* _discovered_refs; |
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241 |
|
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// Arrays of lists of oops, one per thread (pointers into master array above) |
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DiscoveredList* _discoveredSoftRefs; |
1 | 244 |
DiscoveredList* _discoveredWeakRefs; |
245 |
DiscoveredList* _discoveredFinalRefs; |
|
246 |
DiscoveredList* _discoveredPhantomRefs; |
|
28510 | 247 |
DiscoveredList* _discoveredCleanerRefs; |
1 | 248 |
|
249 |
public: |
|
28510 | 250 |
static int number_of_subclasses_of_ref() { return (REF_CLEANER - REF_OTHER); } |
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251 |
|
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252 |
uint num_q() { return _num_q; } |
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253 |
uint max_num_q() { return _max_num_q; } |
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254 |
void set_active_mt_degree(uint v) { _num_q = v; } |
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255 |
|
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256 |
DiscoveredList* discovered_refs() { return _discovered_refs; } |
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257 |
|
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258 |
ReferencePolicy* setup_policy(bool always_clear) { |
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259 |
_current_soft_ref_policy = always_clear ? |
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_always_clear_soft_ref_policy : _default_soft_ref_policy; |
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261 |
_current_soft_ref_policy->setup(); // snapshot the policy threshold |
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262 |
return _current_soft_ref_policy; |
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263 |
} |
1 | 264 |
|
265 |
// Process references with a certain reachability level. |
|
18025 | 266 |
size_t process_discovered_reflist(DiscoveredList refs_lists[], |
267 |
ReferencePolicy* policy, |
|
268 |
bool clear_referent, |
|
269 |
BoolObjectClosure* is_alive, |
|
270 |
OopClosure* keep_alive, |
|
271 |
VoidClosure* complete_gc, |
|
272 |
AbstractRefProcTaskExecutor* task_executor); |
|
1 | 273 |
|
274 |
void process_phaseJNI(BoolObjectClosure* is_alive, |
|
275 |
OopClosure* keep_alive, |
|
276 |
VoidClosure* complete_gc); |
|
277 |
||
278 |
// Work methods used by the method process_discovered_reflist |
|
279 |
// Phase1: keep alive all those referents that are otherwise |
|
280 |
// dead but which must be kept alive by policy (and their closure). |
|
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281 |
void process_phase1(DiscoveredList& refs_list, |
1 | 282 |
ReferencePolicy* policy, |
283 |
BoolObjectClosure* is_alive, |
|
284 |
OopClosure* keep_alive, |
|
285 |
VoidClosure* complete_gc); |
|
286 |
// Phase2: remove all those references whose referents are |
|
287 |
// reachable. |
|
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|
288 |
inline void process_phase2(DiscoveredList& refs_list, |
1 | 289 |
BoolObjectClosure* is_alive, |
290 |
OopClosure* keep_alive, |
|
291 |
VoidClosure* complete_gc) { |
|
292 |
if (discovery_is_atomic()) { |
|
293 |
// complete_gc is ignored in this case for this phase |
|
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294 |
pp2_work(refs_list, is_alive, keep_alive); |
1 | 295 |
} else { |
296 |
assert(complete_gc != NULL, "Error"); |
|
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|
297 |
pp2_work_concurrent_discovery(refs_list, is_alive, |
1 | 298 |
keep_alive, complete_gc); |
299 |
} |
|
300 |
} |
|
301 |
// Work methods in support of process_phase2 |
|
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302 |
void pp2_work(DiscoveredList& refs_list, |
1 | 303 |
BoolObjectClosure* is_alive, |
304 |
OopClosure* keep_alive); |
|
305 |
void pp2_work_concurrent_discovery( |
|
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306 |
DiscoveredList& refs_list, |
1 | 307 |
BoolObjectClosure* is_alive, |
308 |
OopClosure* keep_alive, |
|
309 |
VoidClosure* complete_gc); |
|
310 |
// Phase3: process the referents by either clearing them |
|
311 |
// or keeping them alive (and their closure) |
|
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312 |
void process_phase3(DiscoveredList& refs_list, |
1 | 313 |
bool clear_referent, |
314 |
BoolObjectClosure* is_alive, |
|
315 |
OopClosure* keep_alive, |
|
316 |
VoidClosure* complete_gc); |
|
317 |
||
318 |
// Enqueue references with a certain reachability level |
|
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319 |
void enqueue_discovered_reflist(DiscoveredList& refs_list, HeapWord* pending_list_addr); |
1 | 320 |
|
321 |
// "Preclean" all the discovered reference lists |
|
322 |
// by removing references with strongly reachable referents. |
|
323 |
// The first argument is a predicate on an oop that indicates |
|
324 |
// its (strong) reachability and the second is a closure that |
|
325 |
// may be used to incrementalize or abort the precleaning process. |
|
326 |
// The caller is responsible for taking care of potential |
|
327 |
// interference with concurrent operations on these lists |
|
328 |
// (or predicates involved) by other threads. Currently |
|
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329 |
// only used by the CMS collector. |
1 | 330 |
void preclean_discovered_references(BoolObjectClosure* is_alive, |
331 |
OopClosure* keep_alive, |
|
332 |
VoidClosure* complete_gc, |
|
18025 | 333 |
YieldClosure* yield, |
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334 |
GCTimer* gc_timer, |
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335 |
GCId gc_id); |
1 | 336 |
|
337 |
// Returns the name of the discovered reference list |
|
338 |
// occupying the i / _num_q slot. |
|
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339 |
const char* list_name(uint i); |
1 | 340 |
|
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341 |
void enqueue_discovered_reflists(HeapWord* pending_list_addr, AbstractRefProcTaskExecutor* task_executor); |
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342 |
|
1 | 343 |
protected: |
344 |
// "Preclean" the given discovered reference list |
|
345 |
// by removing references with strongly reachable referents. |
|
346 |
// Currently used in support of CMS only. |
|
347 |
void preclean_discovered_reflist(DiscoveredList& refs_list, |
|
348 |
BoolObjectClosure* is_alive, |
|
349 |
OopClosure* keep_alive, |
|
350 |
VoidClosure* complete_gc, |
|
351 |
YieldClosure* yield); |
|
352 |
||
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353 |
// round-robin mod _num_q (not: _not_ mode _max_num_q) |
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|
354 |
uint next_id() { |
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|
355 |
uint id = _next_id; |
1 | 356 |
if (++_next_id == _num_q) { |
357 |
_next_id = 0; |
|
358 |
} |
|
359 |
return id; |
|
360 |
} |
|
361 |
DiscoveredList* get_discovered_list(ReferenceType rt); |
|
362 |
inline void add_to_discovered_list_mt(DiscoveredList& refs_list, oop obj, |
|
360
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|
363 |
HeapWord* discovered_addr); |
1 | 364 |
void verify_ok_to_handle_reflists() PRODUCT_RETURN; |
365 |
||
10524
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|
366 |
void clear_discovered_references(DiscoveredList& refs_list); |
1 | 367 |
void abandon_partial_discovered_list(DiscoveredList& refs_list); |
368 |
||
369 |
// Calculate the number of jni handles. |
|
370 |
unsigned int count_jni_refs(); |
|
371 |
||
372 |
// Balances reference queues. |
|
373 |
void balance_queues(DiscoveredList ref_lists[]); |
|
374 |
||
375 |
// Update (advance) the soft ref master clock field. |
|
376 |
void update_soft_ref_master_clock(); |
|
377 |
||
378 |
public: |
|
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|
379 |
// Default parameters give you a vanilla reference processor. |
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|
380 |
ReferenceProcessor(MemRegion span, |
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|
381 |
bool mt_processing = false, uint mt_processing_degree = 1, |
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|
382 |
bool mt_discovery = false, uint mt_discovery_degree = 1, |
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|
383 |
bool atomic_discovery = true, |
24845
e8b8894a77df
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|
384 |
BoolObjectClosure* is_alive_non_header = NULL); |
4885
cee90a57b58f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
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|
385 |
|
1 | 386 |
// RefDiscoveryPolicy values |
4885
cee90a57b58f
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changeset
|
387 |
enum DiscoveryPolicy { |
1 | 388 |
ReferenceBasedDiscovery = 0, |
4885
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changeset
|
389 |
ReferentBasedDiscovery = 1, |
cee90a57b58f
6885297: java -XX:RefDiscoveryPolicy=2 or -XX:TLABWasteTargetPercent=0 cause VM crash
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diff
changeset
|
390 |
DiscoveryPolicyMin = ReferenceBasedDiscovery, |
cee90a57b58f
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|
391 |
DiscoveryPolicyMax = ReferentBasedDiscovery |
1 | 392 |
}; |
393 |
||
394 |
static void init_statics(); |
|
395 |
||
396 |
public: |
|
397 |
// get and set "is_alive_non_header" field |
|
398 |
BoolObjectClosure* is_alive_non_header() { |
|
399 |
return _is_alive_non_header; |
|
400 |
} |
|
401 |
void set_is_alive_non_header(BoolObjectClosure* is_alive_non_header) { |
|
402 |
_is_alive_non_header = is_alive_non_header; |
|
403 |
} |
|
404 |
||
405 |
// get and set span |
|
406 |
MemRegion span() { return _span; } |
|
407 |
void set_span(MemRegion span) { _span = span; } |
|
408 |
||
409 |
// start and stop weak ref discovery |
|
28212
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changeset
|
410 |
void enable_discovery(bool check_no_refs = true); |
1 | 411 |
void disable_discovery() { _discovering_refs = false; } |
412 |
bool discovery_enabled() { return _discovering_refs; } |
|
413 |
||
414 |
// whether discovery is atomic wrt other collectors |
|
415 |
bool discovery_is_atomic() const { return _discovery_is_atomic; } |
|
416 |
void set_atomic_discovery(bool atomic) { _discovery_is_atomic = atomic; } |
|
417 |
||
418 |
// whether discovery is done by multiple threads same-old-timeously |
|
419 |
bool discovery_is_mt() const { return _discovery_is_mt; } |
|
420 |
void set_mt_discovery(bool mt) { _discovery_is_mt = mt; } |
|
421 |
||
422 |
// Whether we are in a phase when _processing_ is MT. |
|
423 |
bool processing_is_mt() const { return _processing_is_mt; } |
|
424 |
void set_mt_processing(bool mt) { _processing_is_mt = mt; } |
|
425 |
||
22551 | 426 |
// whether all enqueueing of weak references is complete |
1 | 427 |
bool enqueuing_is_done() { return _enqueuing_is_done; } |
428 |
void set_enqueuing_is_done(bool v) { _enqueuing_is_done = v; } |
|
429 |
||
430 |
// iterate over oops |
|
431 |
void weak_oops_do(OopClosure* f); // weak roots |
|
432 |
||
6759
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|
433 |
// Balance each of the discovered lists. |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
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diff
changeset
|
434 |
void balance_all_queues(); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
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13195
diff
changeset
|
435 |
void verify_list(DiscoveredList& ref_list); |
6759
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|
436 |
|
1 | 437 |
// Discover a Reference object, using appropriate discovery criteria |
438 |
bool discover_reference(oop obj, ReferenceType rt); |
|
439 |
||
440 |
// Process references found during GC (called by the garbage collector) |
|
18025 | 441 |
ReferenceProcessorStats |
442 |
process_discovered_references(BoolObjectClosure* is_alive, |
|
443 |
OopClosure* keep_alive, |
|
444 |
VoidClosure* complete_gc, |
|
445 |
AbstractRefProcTaskExecutor* task_executor, |
|
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
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parents:
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diff
changeset
|
446 |
GCTimer *gc_timer, |
6423a57e5451
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diff
changeset
|
447 |
GCId gc_id); |
1 | 448 |
|
449 |
// Enqueue references at end of GC (called by the garbage collector) |
|
450 |
bool enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor = NULL); |
|
451 |
||
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
452 |
// If a discovery is in process that is being superceded, abandon it: all |
4c24294029a9
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360
diff
changeset
|
453 |
// the discovered lists will be empty, and all the objects on them will |
4c24294029a9
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360
diff
changeset
|
454 |
// have NULL discovered fields. Must be called only at a safepoint. |
4c24294029a9
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360
diff
changeset
|
455 |
void abandon_partial_discovery(); |
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360
diff
changeset
|
456 |
|
1 | 457 |
// debugging |
458 |
void verify_no_references_recorded() PRODUCT_RETURN; |
|
7420
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7397
diff
changeset
|
459 |
void verify_referent(oop obj) PRODUCT_RETURN; |
1 | 460 |
|
461 |
// clear the discovered lists (unlinking each entry). |
|
462 |
void clear_discovered_references() PRODUCT_RETURN; |
|
463 |
}; |
|
464 |
||
465 |
// A utility class to disable reference discovery in |
|
466 |
// the scope which contains it, for given ReferenceProcessor. |
|
467 |
class NoRefDiscovery: StackObj { |
|
468 |
private: |
|
469 |
ReferenceProcessor* _rp; |
|
470 |
bool _was_discovering_refs; |
|
471 |
public: |
|
472 |
NoRefDiscovery(ReferenceProcessor* rp) : _rp(rp) { |
|
6459
3d75ed40a975
6934483: GCC 4.5 errors "suggest parentheses around something..." when compiling with -Werror and -Wall
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parents:
5547
diff
changeset
|
473 |
_was_discovering_refs = _rp->discovery_enabled(); |
3d75ed40a975
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changeset
|
474 |
if (_was_discovering_refs) { |
1 | 475 |
_rp->disable_discovery(); |
476 |
} |
|
477 |
} |
|
478 |
||
479 |
~NoRefDiscovery() { |
|
480 |
if (_was_discovering_refs) { |
|
28212
647b7d0efb88
8066827: Remove ReferenceProcessor::clean_up_discovered_references()
kbarrett
parents:
25350
diff
changeset
|
481 |
_rp->enable_discovery(false /*check_no_refs*/); |
1 | 482 |
} |
483 |
} |
|
484 |
}; |
|
485 |
||
486 |
||
487 |
// A utility class to temporarily mutate the span of the |
|
488 |
// given ReferenceProcessor in the scope that contains it. |
|
489 |
class ReferenceProcessorSpanMutator: StackObj { |
|
490 |
private: |
|
491 |
ReferenceProcessor* _rp; |
|
492 |
MemRegion _saved_span; |
|
493 |
||
494 |
public: |
|
495 |
ReferenceProcessorSpanMutator(ReferenceProcessor* rp, |
|
496 |
MemRegion span): |
|
497 |
_rp(rp) { |
|
498 |
_saved_span = _rp->span(); |
|
499 |
_rp->set_span(span); |
|
500 |
} |
|
501 |
||
502 |
~ReferenceProcessorSpanMutator() { |
|
503 |
_rp->set_span(_saved_span); |
|
504 |
} |
|
505 |
}; |
|
506 |
||
507 |
// A utility class to temporarily change the MT'ness of |
|
508 |
// reference discovery for the given ReferenceProcessor |
|
509 |
// in the scope that contains it. |
|
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7420
diff
changeset
|
510 |
class ReferenceProcessorMTDiscoveryMutator: StackObj { |
1 | 511 |
private: |
512 |
ReferenceProcessor* _rp; |
|
513 |
bool _saved_mt; |
|
514 |
||
515 |
public: |
|
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7420
diff
changeset
|
516 |
ReferenceProcessorMTDiscoveryMutator(ReferenceProcessor* rp, |
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7420
diff
changeset
|
517 |
bool mt): |
1 | 518 |
_rp(rp) { |
519 |
_saved_mt = _rp->discovery_is_mt(); |
|
520 |
_rp->set_mt_discovery(mt); |
|
521 |
} |
|
522 |
||
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7420
diff
changeset
|
523 |
~ReferenceProcessorMTDiscoveryMutator() { |
1 | 524 |
_rp->set_mt_discovery(_saved_mt); |
525 |
} |
|
526 |
}; |
|
527 |
||
528 |
||
529 |
// A utility class to temporarily change the disposition |
|
530 |
// of the "is_alive_non_header" closure field of the |
|
531 |
// given ReferenceProcessor in the scope that contains it. |
|
532 |
class ReferenceProcessorIsAliveMutator: StackObj { |
|
533 |
private: |
|
534 |
ReferenceProcessor* _rp; |
|
535 |
BoolObjectClosure* _saved_cl; |
|
536 |
||
537 |
public: |
|
538 |
ReferenceProcessorIsAliveMutator(ReferenceProcessor* rp, |
|
539 |
BoolObjectClosure* cl): |
|
540 |
_rp(rp) { |
|
541 |
_saved_cl = _rp->is_alive_non_header(); |
|
542 |
_rp->set_is_alive_non_header(cl); |
|
543 |
} |
|
544 |
||
545 |
~ReferenceProcessorIsAliveMutator() { |
|
546 |
_rp->set_is_alive_non_header(_saved_cl); |
|
547 |
} |
|
548 |
}; |
|
549 |
||
550 |
// A utility class to temporarily change the disposition |
|
551 |
// of the "discovery_is_atomic" field of the |
|
552 |
// given ReferenceProcessor in the scope that contains it. |
|
553 |
class ReferenceProcessorAtomicMutator: StackObj { |
|
554 |
private: |
|
555 |
ReferenceProcessor* _rp; |
|
556 |
bool _saved_atomic_discovery; |
|
557 |
||
558 |
public: |
|
559 |
ReferenceProcessorAtomicMutator(ReferenceProcessor* rp, |
|
560 |
bool atomic): |
|
561 |
_rp(rp) { |
|
562 |
_saved_atomic_discovery = _rp->discovery_is_atomic(); |
|
563 |
_rp->set_atomic_discovery(atomic); |
|
564 |
} |
|
565 |
||
566 |
~ReferenceProcessorAtomicMutator() { |
|
567 |
_rp->set_atomic_discovery(_saved_atomic_discovery); |
|
568 |
} |
|
569 |
}; |
|
570 |
||
571 |
||
572 |
// A utility class to temporarily change the MT processing |
|
573 |
// disposition of the given ReferenceProcessor instance |
|
574 |
// in the scope that contains it. |
|
575 |
class ReferenceProcessorMTProcMutator: StackObj { |
|
576 |
private: |
|
577 |
ReferenceProcessor* _rp; |
|
578 |
bool _saved_mt; |
|
579 |
||
580 |
public: |
|
581 |
ReferenceProcessorMTProcMutator(ReferenceProcessor* rp, |
|
582 |
bool mt): |
|
583 |
_rp(rp) { |
|
584 |
_saved_mt = _rp->processing_is_mt(); |
|
585 |
_rp->set_mt_processing(mt); |
|
586 |
} |
|
587 |
||
588 |
~ReferenceProcessorMTProcMutator() { |
|
589 |
_rp->set_mt_processing(_saved_mt); |
|
590 |
} |
|
591 |
}; |
|
592 |
||
593 |
||
594 |
// This class is an interface used to implement task execution for the |
|
595 |
// reference processing. |
|
596 |
class AbstractRefProcTaskExecutor { |
|
597 |
public: |
|
598 |
||
599 |
// Abstract tasks to execute. |
|
600 |
class ProcessTask; |
|
601 |
class EnqueueTask; |
|
602 |
||
603 |
// Executes a task using worker threads. |
|
604 |
virtual void execute(ProcessTask& task) = 0; |
|
605 |
virtual void execute(EnqueueTask& task) = 0; |
|
606 |
||
607 |
// Switch to single threaded mode. |
|
608 |
virtual void set_single_threaded_mode() { }; |
|
609 |
}; |
|
610 |
||
611 |
// Abstract reference processing task to execute. |
|
612 |
class AbstractRefProcTaskExecutor::ProcessTask { |
|
613 |
protected: |
|
614 |
ProcessTask(ReferenceProcessor& ref_processor, |
|
615 |
DiscoveredList refs_lists[], |
|
616 |
bool marks_oops_alive) |
|
617 |
: _ref_processor(ref_processor), |
|
618 |
_refs_lists(refs_lists), |
|
619 |
_marks_oops_alive(marks_oops_alive) |
|
620 |
{ } |
|
621 |
||
622 |
public: |
|
623 |
virtual void work(unsigned int work_id, BoolObjectClosure& is_alive, |
|
624 |
OopClosure& keep_alive, |
|
625 |
VoidClosure& complete_gc) = 0; |
|
626 |
||
627 |
// Returns true if a task marks some oops as alive. |
|
628 |
bool marks_oops_alive() const |
|
629 |
{ return _marks_oops_alive; } |
|
630 |
||
631 |
protected: |
|
632 |
ReferenceProcessor& _ref_processor; |
|
633 |
DiscoveredList* _refs_lists; |
|
634 |
const bool _marks_oops_alive; |
|
635 |
}; |
|
636 |
||
637 |
// Abstract reference processing task to execute. |
|
638 |
class AbstractRefProcTaskExecutor::EnqueueTask { |
|
639 |
protected: |
|
640 |
EnqueueTask(ReferenceProcessor& ref_processor, |
|
641 |
DiscoveredList refs_lists[], |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
642 |
HeapWord* pending_list_addr, |
1 | 643 |
int n_queues) |
644 |
: _ref_processor(ref_processor), |
|
645 |
_refs_lists(refs_lists), |
|
646 |
_pending_list_addr(pending_list_addr), |
|
647 |
_n_queues(n_queues) |
|
648 |
{ } |
|
649 |
||
650 |
public: |
|
651 |
virtual void work(unsigned int work_id) = 0; |
|
652 |
||
653 |
protected: |
|
654 |
ReferenceProcessor& _ref_processor; |
|
655 |
DiscoveredList* _refs_lists; |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
656 |
HeapWord* _pending_list_addr; |
1 | 657 |
int _n_queues; |
658 |
}; |
|
7397 | 659 |
|
660 |
#endif // SHARE_VM_MEMORY_REFERENCEPROCESSOR_HPP |