author | brutisso |
Tue, 03 Jun 2014 10:44:36 +0200 | |
changeset 24845 | e8b8894a77df |
parent 24424 | 2658d7834c6e |
child 25350 | 6423a57e5451 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2014, 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 "classfile/javaClasses.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "gc_implementation/shared/gcTimer.hpp" |
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#include "gc_implementation/shared/gcTraceTime.hpp" |
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#include "gc_interface/collectedHeap.hpp" |
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#include "gc_interface/collectedHeap.inline.hpp" |
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#include "memory/referencePolicy.hpp" |
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#include "memory/referenceProcessor.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "runtime/jniHandles.hpp" |
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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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ReferencePolicy* ReferenceProcessor::_always_clear_soft_ref_policy = NULL; |
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ReferencePolicy* ReferenceProcessor::_default_soft_ref_policy = NULL; |
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bool ReferenceProcessor::_pending_list_uses_discovered_field = false; |
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jlong ReferenceProcessor::_soft_ref_timestamp_clock = 0; |
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void referenceProcessor_init() { |
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ReferenceProcessor::init_statics(); |
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} |
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void ReferenceProcessor::init_statics() { |
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// We need a monotonically non-decreasing time in ms but |
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// os::javaTimeMillis() does not guarantee monotonicity. |
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jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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// Initialize the soft ref timestamp clock. |
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_soft_ref_timestamp_clock = now; |
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// Also update the soft ref clock in j.l.r.SoftReference |
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java_lang_ref_SoftReference::set_clock(_soft_ref_timestamp_clock); |
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_always_clear_soft_ref_policy = new AlwaysClearPolicy(); |
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_default_soft_ref_policy = new COMPILER2_PRESENT(LRUMaxHeapPolicy()) |
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NOT_COMPILER2(LRUCurrentHeapPolicy()); |
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if (_always_clear_soft_ref_policy == NULL || _default_soft_ref_policy == NULL) { |
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vm_exit_during_initialization("Could not allocate reference policy object"); |
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} |
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guarantee(RefDiscoveryPolicy == ReferenceBasedDiscovery || |
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RefDiscoveryPolicy == ReferentBasedDiscovery, |
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"Unrecognized RefDiscoveryPolicy"); |
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_pending_list_uses_discovered_field = JDK_Version::current().pending_list_uses_discovered_field(); |
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} |
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void ReferenceProcessor::enable_discovery(bool verify_disabled, bool check_no_refs) { |
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#ifdef ASSERT |
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// Verify that we're not currently discovering refs |
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assert(!verify_disabled || !_discovering_refs, "nested call?"); |
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if (check_no_refs) { |
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// Verify that the discovered lists are empty |
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verify_no_references_recorded(); |
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} |
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#endif // ASSERT |
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// Someone could have modified the value of the static |
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// field in the j.l.r.SoftReference class that holds the |
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// soft reference timestamp clock using reflection or |
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// Unsafe between GCs. Unconditionally update the static |
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// field in ReferenceProcessor here so that we use the new |
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// value during reference discovery. |
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_soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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_discovering_refs = true; |
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} |
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ReferenceProcessor::ReferenceProcessor(MemRegion span, |
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bool mt_processing, |
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uint mt_processing_degree, |
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bool mt_discovery, |
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uint mt_discovery_degree, |
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bool atomic_discovery, |
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BoolObjectClosure* is_alive_non_header) : |
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_discovering_refs(false), |
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_enqueuing_is_done(false), |
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_is_alive_non_header(is_alive_non_header), |
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_processing_is_mt(mt_processing), |
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_next_id(0) |
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{ |
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_span = span; |
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_discovery_is_atomic = atomic_discovery; |
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_discovery_is_mt = mt_discovery; |
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_num_q = MAX2(1U, mt_processing_degree); |
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_max_num_q = MAX2(_num_q, mt_discovery_degree); |
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_discovered_refs = NEW_C_HEAP_ARRAY(DiscoveredList, |
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_max_num_q * number_of_subclasses_of_ref(), mtGC); |
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if (_discovered_refs == NULL) { |
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vm_exit_during_initialization("Could not allocated RefProc Array"); |
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} |
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_discoveredSoftRefs = &_discovered_refs[0]; |
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_discoveredWeakRefs = &_discoveredSoftRefs[_max_num_q]; |
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_discoveredFinalRefs = &_discoveredWeakRefs[_max_num_q]; |
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_discoveredPhantomRefs = &_discoveredFinalRefs[_max_num_q]; |
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// Initialize all entries to NULL |
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for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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_discovered_refs[i].set_head(NULL); |
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_discovered_refs[i].set_length(0); |
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} |
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setup_policy(false /* default soft ref policy */); |
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} |
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#ifndef PRODUCT |
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void ReferenceProcessor::verify_no_references_recorded() { |
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guarantee(!_discovering_refs, "Discovering refs?"); |
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for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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guarantee(_discovered_refs[i].is_empty(), |
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"Found non-empty discovered list"); |
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} |
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} |
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#endif |
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void ReferenceProcessor::weak_oops_do(OopClosure* f) { |
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for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
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if (UseCompressedOops) { |
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f->do_oop((narrowOop*)_discovered_refs[i].adr_head()); |
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} else { |
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f->do_oop((oop*)_discovered_refs[i].adr_head()); |
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} |
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} |
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} |
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void ReferenceProcessor::update_soft_ref_master_clock() { |
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// Update (advance) the soft ref master clock field. This must be done |
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// after processing the soft ref list. |
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// We need a monotonically non-decreasing time in ms but |
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// os::javaTimeMillis() does not guarantee monotonicity. |
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jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
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jlong soft_ref_clock = java_lang_ref_SoftReference::clock(); |
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assert(soft_ref_clock == _soft_ref_timestamp_clock, "soft ref clocks out of sync"); |
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1 | 161 |
NOT_PRODUCT( |
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if (now < _soft_ref_timestamp_clock) { |
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warning("time warp: "INT64_FORMAT" to "INT64_FORMAT, |
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_soft_ref_timestamp_clock, now); |
1 | 165 |
} |
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) |
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// The values of now and _soft_ref_timestamp_clock are set using |
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// javaTimeNanos(), which is guaranteed to be monotonically |
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// non-decreasing provided the underlying platform provides such |
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// a time source (and it is bug free). |
22551 | 171 |
// In product mode, however, protect ourselves from non-monotonicity. |
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172 |
if (now > _soft_ref_timestamp_clock) { |
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173 |
_soft_ref_timestamp_clock = now; |
1 | 174 |
java_lang_ref_SoftReference::set_clock(now); |
175 |
} |
|
176 |
// Else leave clock stalled at its old value until time progresses |
|
177 |
// past clock value. |
|
178 |
} |
|
179 |
||
18025 | 180 |
size_t ReferenceProcessor::total_count(DiscoveredList lists[]) { |
181 |
size_t total = 0; |
|
182 |
for (uint i = 0; i < _max_num_q; ++i) { |
|
183 |
total += lists[i].length(); |
|
184 |
} |
|
185 |
return total; |
|
186 |
} |
|
187 |
||
188 |
ReferenceProcessorStats ReferenceProcessor::process_discovered_references( |
|
1 | 189 |
BoolObjectClosure* is_alive, |
190 |
OopClosure* keep_alive, |
|
191 |
VoidClosure* complete_gc, |
|
18025 | 192 |
AbstractRefProcTaskExecutor* task_executor, |
193 |
GCTimer* gc_timer) { |
|
1 | 194 |
NOT_PRODUCT(verify_ok_to_handle_reflists()); |
195 |
||
196 |
assert(!enqueuing_is_done(), "If here enqueuing should not be complete"); |
|
197 |
// Stop treating discovered references specially. |
|
198 |
disable_discovery(); |
|
199 |
||
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// If discovery was concurrent, someone could have modified |
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// the value of the static field in the j.l.r.SoftReference |
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// class that holds the soft reference timestamp clock using |
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// reflection or Unsafe between when discovery was enabled and |
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// now. Unconditionally update the static field in ReferenceProcessor |
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|
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// here so that we use the new value during processing of the |
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|
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// discovered soft refs. |
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|
207 |
|
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|
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_soft_ref_timestamp_clock = java_lang_ref_SoftReference::clock(); |
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209 |
|
1 | 210 |
bool trace_time = PrintGCDetails && PrintReferenceGC; |
18025 | 211 |
|
1 | 212 |
// Soft references |
18025 | 213 |
size_t soft_count = 0; |
1 | 214 |
{ |
18025 | 215 |
GCTraceTime tt("SoftReference", trace_time, false, gc_timer); |
216 |
soft_count = |
|
217 |
process_discovered_reflist(_discoveredSoftRefs, _current_soft_ref_policy, true, |
|
218 |
is_alive, keep_alive, complete_gc, task_executor); |
|
1 | 219 |
} |
220 |
||
221 |
update_soft_ref_master_clock(); |
|
222 |
||
223 |
// Weak references |
|
18025 | 224 |
size_t weak_count = 0; |
1 | 225 |
{ |
18025 | 226 |
GCTraceTime tt("WeakReference", trace_time, false, gc_timer); |
227 |
weak_count = |
|
228 |
process_discovered_reflist(_discoveredWeakRefs, NULL, true, |
|
229 |
is_alive, keep_alive, complete_gc, task_executor); |
|
1 | 230 |
} |
231 |
||
232 |
// Final references |
|
18025 | 233 |
size_t final_count = 0; |
1 | 234 |
{ |
18025 | 235 |
GCTraceTime tt("FinalReference", trace_time, false, gc_timer); |
236 |
final_count = |
|
237 |
process_discovered_reflist(_discoveredFinalRefs, NULL, false, |
|
238 |
is_alive, keep_alive, complete_gc, task_executor); |
|
1 | 239 |
} |
240 |
||
241 |
// Phantom references |
|
18025 | 242 |
size_t phantom_count = 0; |
1 | 243 |
{ |
18025 | 244 |
GCTraceTime tt("PhantomReference", trace_time, false, gc_timer); |
245 |
phantom_count = |
|
246 |
process_discovered_reflist(_discoveredPhantomRefs, NULL, false, |
|
247 |
is_alive, keep_alive, complete_gc, task_executor); |
|
1 | 248 |
} |
249 |
||
250 |
// Weak global JNI references. It would make more sense (semantically) to |
|
251 |
// traverse these simultaneously with the regular weak references above, but |
|
252 |
// that is not how the JDK1.2 specification is. See #4126360. Native code can |
|
253 |
// thus use JNI weak references to circumvent the phantom references and |
|
254 |
// resurrect a "post-mortem" object. |
|
255 |
{ |
|
18025 | 256 |
GCTraceTime tt("JNI Weak Reference", trace_time, false, gc_timer); |
1 | 257 |
if (task_executor != NULL) { |
258 |
task_executor->set_single_threaded_mode(); |
|
259 |
} |
|
260 |
process_phaseJNI(is_alive, keep_alive, complete_gc); |
|
261 |
} |
|
18025 | 262 |
|
263 |
return ReferenceProcessorStats(soft_count, weak_count, final_count, phantom_count); |
|
1 | 264 |
} |
265 |
||
266 |
#ifndef PRODUCT |
|
267 |
// Calculate the number of jni handles. |
|
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uint ReferenceProcessor::count_jni_refs() { |
1 | 269 |
class AlwaysAliveClosure: public BoolObjectClosure { |
270 |
public: |
|
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271 |
virtual bool do_object_b(oop obj) { return true; } |
1 | 272 |
}; |
273 |
||
274 |
class CountHandleClosure: public OopClosure { |
|
275 |
private: |
|
276 |
int _count; |
|
277 |
public: |
|
278 |
CountHandleClosure(): _count(0) {} |
|
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void do_oop(oop* unused) { _count++; } |
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280 |
void do_oop(narrowOop* unused) { ShouldNotReachHere(); } |
1 | 281 |
int count() { return _count; } |
282 |
}; |
|
283 |
CountHandleClosure global_handle_count; |
|
284 |
AlwaysAliveClosure always_alive; |
|
285 |
JNIHandles::weak_oops_do(&always_alive, &global_handle_count); |
|
286 |
return global_handle_count.count(); |
|
287 |
} |
|
288 |
#endif |
|
289 |
||
290 |
void ReferenceProcessor::process_phaseJNI(BoolObjectClosure* is_alive, |
|
291 |
OopClosure* keep_alive, |
|
292 |
VoidClosure* complete_gc) { |
|
293 |
#ifndef PRODUCT |
|
294 |
if (PrintGCDetails && PrintReferenceGC) { |
|
295 |
unsigned int count = count_jni_refs(); |
|
296 |
gclog_or_tty->print(", %u refs", count); |
|
297 |
} |
|
298 |
#endif |
|
299 |
JNIHandles::weak_oops_do(is_alive, keep_alive); |
|
300 |
complete_gc->do_void(); |
|
301 |
} |
|
302 |
||
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|
303 |
|
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|
304 |
template <class T> |
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305 |
bool enqueue_discovered_ref_helper(ReferenceProcessor* ref, |
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AbstractRefProcTaskExecutor* task_executor) { |
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307 |
|
1 | 308 |
// Remember old value of pending references list |
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T* pending_list_addr = (T*)java_lang_ref_Reference::pending_list_addr(); |
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|
310 |
T old_pending_list_value = *pending_list_addr; |
1 | 311 |
|
312 |
// Enqueue references that are not made active again, and |
|
313 |
// clear the decks for the next collection (cycle). |
|
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|
314 |
ref->enqueue_discovered_reflists((HeapWord*)pending_list_addr, task_executor); |
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|
315 |
// Do the post-barrier on pending_list_addr missed in |
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|
316 |
// enqueue_discovered_reflist. |
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|
317 |
oopDesc::bs()->write_ref_field(pending_list_addr, oopDesc::load_decode_heap_oop(pending_list_addr)); |
1 | 318 |
|
319 |
// Stop treating discovered references specially. |
|
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|
320 |
ref->disable_discovery(); |
1 | 321 |
|
322 |
// Return true if new pending references were added |
|
323 |
return old_pending_list_value != *pending_list_addr; |
|
324 |
} |
|
325 |
||
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|
326 |
bool ReferenceProcessor::enqueue_discovered_references(AbstractRefProcTaskExecutor* task_executor) { |
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|
327 |
NOT_PRODUCT(verify_ok_to_handle_reflists()); |
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|
328 |
if (UseCompressedOops) { |
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|
329 |
return enqueue_discovered_ref_helper<narrowOop>(this, task_executor); |
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|
330 |
} else { |
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|
331 |
return enqueue_discovered_ref_helper<oop>(this, task_executor); |
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|
332 |
} |
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|
333 |
} |
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|
334 |
|
1 | 335 |
void ReferenceProcessor::enqueue_discovered_reflist(DiscoveredList& refs_list, |
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|
336 |
HeapWord* pending_list_addr) { |
1 | 337 |
// Given a list of refs linked through the "discovered" field |
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|
338 |
// (java.lang.ref.Reference.discovered), self-loop their "next" field |
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|
339 |
// thus distinguishing them from active References, then |
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|
340 |
// prepend them to the pending list. |
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|
341 |
// |
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|
342 |
// The Java threads will see the Reference objects linked together through |
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|
343 |
// the discovered field. Instead of trying to do the write barrier updates |
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|
344 |
// in all places in the reference processor where we manipulate the discovered |
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|
345 |
// field we make sure to do the barrier here where we anyway iterate through |
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|
346 |
// all linked Reference objects. Note that it is important to not dirty any |
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|
347 |
// cards during reference processing since this will cause card table |
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|
348 |
// verification to fail for G1. |
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|
349 |
// |
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|
350 |
// BKWRD COMPATIBILITY NOTE: For older JDKs (prior to the fix for 4956777), |
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|
351 |
// the "next" field is used to chain the pending list, not the discovered |
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|
352 |
// field. |
1 | 353 |
if (TraceReferenceGC && PrintGCDetails) { |
354 |
gclog_or_tty->print_cr("ReferenceProcessor::enqueue_discovered_reflist list " |
|
355 |
INTPTR_FORMAT, (address)refs_list.head()); |
|
356 |
} |
|
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|
357 |
|
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|
358 |
oop obj = NULL; |
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|
359 |
oop next_d = refs_list.head(); |
22551 | 360 |
if (pending_list_uses_discovered_field()) { // New behavior |
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|
361 |
// Walk down the list, self-looping the next field |
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|
362 |
// so that the References are not considered active. |
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|
363 |
while (obj != next_d) { |
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|
364 |
obj = next_d; |
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|
365 |
assert(obj->is_instanceRef(), "should be reference object"); |
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|
366 |
next_d = java_lang_ref_Reference::discovered(obj); |
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|
367 |
if (TraceReferenceGC && PrintGCDetails) { |
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|
368 |
gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
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|
369 |
(void *)obj, (void *)next_d); |
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|
370 |
} |
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|
371 |
assert(java_lang_ref_Reference::next(obj) == NULL, |
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|
372 |
"Reference not active; should not be discovered"); |
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|
373 |
// Self-loop next, so as to make Ref not active. |
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|
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java_lang_ref_Reference::set_next_raw(obj, obj); |
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|
375 |
if (next_d != obj) { |
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|
376 |
oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), next_d); |
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|
377 |
} else { |
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|
378 |
// This is the last object. |
22551 | 379 |
// Swap refs_list into pending_list_addr and |
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|
380 |
// set obj's discovered to what we read from pending_list_addr. |
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|
381 |
oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
24845
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changeset
|
382 |
// Need post-barrier on pending_list_addr. See enqueue_discovered_ref_helper() above. |
22496
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parents:
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changeset
|
383 |
java_lang_ref_Reference::set_discovered_raw(obj, old); // old may be NULL |
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changeset
|
384 |
oopDesc::bs()->write_ref_field(java_lang_ref_Reference::discovered_addr(obj), old); |
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|
385 |
} |
1 | 386 |
} |
22551 | 387 |
} else { // Old behavior |
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changeset
|
388 |
// Walk down the list, copying the discovered field into |
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changeset
|
389 |
// the next field and clearing the discovered field. |
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changeset
|
390 |
while (obj != next_d) { |
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|
391 |
obj = next_d; |
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diff
changeset
|
392 |
assert(obj->is_instanceRef(), "should be reference object"); |
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changeset
|
393 |
next_d = java_lang_ref_Reference::discovered(obj); |
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|
394 |
if (TraceReferenceGC && PrintGCDetails) { |
3e92f211533f
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changeset
|
395 |
gclog_or_tty->print_cr(" obj " INTPTR_FORMAT "/next_d " INTPTR_FORMAT, |
20282
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|
396 |
(void *)obj, (void *)next_d); |
10526
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|
397 |
} |
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changeset
|
398 |
assert(java_lang_ref_Reference::next(obj) == NULL, |
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changeset
|
399 |
"The reference should not be enqueued"); |
3e92f211533f
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changeset
|
400 |
if (next_d == obj) { // obj is last |
22551 | 401 |
// Swap refs_list into pending_list_addr and |
10526
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|
402 |
// set obj's next to what we read from pending_list_addr. |
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|
403 |
oop old = oopDesc::atomic_exchange_oop(refs_list.head(), pending_list_addr); |
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changeset
|
404 |
// Need oop_check on pending_list_addr above; |
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changeset
|
405 |
// see special oop-check code at the end of |
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changeset
|
406 |
// enqueue_discovered_reflists() further below. |
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diff
changeset
|
407 |
if (old == NULL) { |
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changeset
|
408 |
// obj should be made to point to itself, since |
3e92f211533f
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changeset
|
409 |
// pending list was empty. |
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changeset
|
410 |
java_lang_ref_Reference::set_next(obj, obj); |
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changeset
|
411 |
} else { |
3e92f211533f
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diff
changeset
|
412 |
java_lang_ref_Reference::set_next(obj, old); |
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changeset
|
413 |
} |
1 | 414 |
} else { |
10526
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changeset
|
415 |
java_lang_ref_Reference::set_next(obj, next_d); |
1 | 416 |
} |
10526
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changeset
|
417 |
java_lang_ref_Reference::set_discovered(obj, (oop) NULL); |
1 | 418 |
} |
419 |
} |
|
420 |
} |
|
421 |
||
422 |
// Parallel enqueue task |
|
423 |
class RefProcEnqueueTask: public AbstractRefProcTaskExecutor::EnqueueTask { |
|
424 |
public: |
|
425 |
RefProcEnqueueTask(ReferenceProcessor& ref_processor, |
|
426 |
DiscoveredList discovered_refs[], |
|
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|
427 |
HeapWord* pending_list_addr, |
1 | 428 |
int n_queues) |
429 |
: EnqueueTask(ref_processor, discovered_refs, |
|
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|
430 |
pending_list_addr, n_queues) |
1 | 431 |
{ } |
432 |
||
360
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|
433 |
virtual void work(unsigned int work_id) { |
8688
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changeset
|
434 |
assert(work_id < (unsigned int)_ref_processor.max_num_q(), "Index out-of-bounds"); |
1 | 435 |
// Simplest first cut: static partitioning. |
436 |
int index = work_id; |
|
6759
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5547
diff
changeset
|
437 |
// The increment on "index" must correspond to the maximum number of queues |
67b1a69ef5aa
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parents:
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diff
changeset
|
438 |
// (n_queues) with which that ReferenceProcessor was created. That |
67b1a69ef5aa
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parents:
5547
diff
changeset
|
439 |
// is because of the "clever" way the discovered references lists were |
8688
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parents:
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diff
changeset
|
440 |
// allocated and are indexed into. |
493d12ccc6db
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parents:
7420
diff
changeset
|
441 |
assert(_n_queues == (int) _ref_processor.max_num_q(), "Different number not expected"); |
6759
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changeset
|
442 |
for (int j = 0; |
10670
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changeset
|
443 |
j < ReferenceProcessor::number_of_subclasses_of_ref(); |
6759
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6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
444 |
j++, index += _n_queues) { |
1 | 445 |
_ref_processor.enqueue_discovered_reflist( |
446 |
_refs_lists[index], _pending_list_addr); |
|
10524
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diff
changeset
|
447 |
_refs_lists[index].set_head(NULL); |
1 | 448 |
_refs_lists[index].set_length(0); |
449 |
} |
|
450 |
} |
|
451 |
}; |
|
452 |
||
453 |
// Enqueue references that are not made active again |
|
360
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|
454 |
void ReferenceProcessor::enqueue_discovered_reflists(HeapWord* pending_list_addr, |
1 | 455 |
AbstractRefProcTaskExecutor* task_executor) { |
456 |
if (_processing_is_mt && task_executor != NULL) { |
|
457 |
// Parallel code |
|
10747
dfdb9eb56e49
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
10683
diff
changeset
|
458 |
RefProcEnqueueTask tsk(*this, _discovered_refs, |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
459 |
pending_list_addr, _max_num_q); |
1 | 460 |
task_executor->execute(tsk); |
461 |
} else { |
|
462 |
// Serial code: call the parent class's implementation |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
463 |
for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
10747
dfdb9eb56e49
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
10683
diff
changeset
|
464 |
enqueue_discovered_reflist(_discovered_refs[i], pending_list_addr); |
dfdb9eb56e49
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
10683
diff
changeset
|
465 |
_discovered_refs[i].set_head(NULL); |
dfdb9eb56e49
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
10683
diff
changeset
|
466 |
_discovered_refs[i].set_length(0); |
1 | 467 |
} |
468 |
} |
|
469 |
} |
|
470 |
||
10670
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changeset
|
471 |
void DiscoveredListIterator::load_ptrs(DEBUG_ONLY(bool allow_null_referent)) { |
1 | 472 |
_discovered_addr = java_lang_ref_Reference::discovered_addr(_ref); |
360
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|
473 |
oop discovered = java_lang_ref_Reference::discovered(_ref); |
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diff
changeset
|
474 |
assert(_discovered_addr && discovered->is_oop_or_null(), |
1 | 475 |
"discovered field is bad"); |
360
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changeset
|
476 |
_next = discovered; |
1 | 477 |
_referent_addr = java_lang_ref_Reference::referent_addr(_ref); |
360
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changeset
|
478 |
_referent = java_lang_ref_Reference::referent(_ref); |
1 | 479 |
assert(Universe::heap()->is_in_reserved_or_null(_referent), |
480 |
"Wrong oop found in java.lang.Reference object"); |
|
481 |
assert(allow_null_referent ? |
|
482 |
_referent->is_oop_or_null() |
|
483 |
: _referent->is_oop(), |
|
484 |
"bad referent"); |
|
485 |
} |
|
486 |
||
10670
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6484982: G1: process references during evacuation pauses
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parents:
10526
diff
changeset
|
487 |
void DiscoveredListIterator::remove() { |
1 | 488 |
assert(_ref->is_oop(), "Dropping a bad reference"); |
360
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diff
changeset
|
489 |
oop_store_raw(_discovered_addr, NULL); |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
490 |
|
360
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diff
changeset
|
491 |
// First _prev_next ref actually points into DiscoveredList (gross). |
10524
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7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
492 |
oop new_next; |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
493 |
if (_next == _ref) { |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
494 |
// At the end of the list, we should make _prev point to itself. |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
495 |
// If _ref is the first ref, then _prev_next will be in the DiscoveredList, |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
496 |
// and _prev will be NULL. |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
497 |
new_next = _prev; |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
498 |
} else { |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
499 |
new_next = _next; |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
500 |
} |
22768
363a44995a71
8031703: Missing post-barrier in ReferenceProcessor
pliden
parents:
22551
diff
changeset
|
501 |
// Remove Reference object from discovered list. Note that G1 does not need a |
363a44995a71
8031703: Missing post-barrier in ReferenceProcessor
pliden
parents:
22551
diff
changeset
|
502 |
// pre-barrier here because we know the Reference has already been found/marked, |
363a44995a71
8031703: Missing post-barrier in ReferenceProcessor
pliden
parents:
22551
diff
changeset
|
503 |
// that's how it ended up in the discovered list in the first place. |
363a44995a71
8031703: Missing post-barrier in ReferenceProcessor
pliden
parents:
22551
diff
changeset
|
504 |
oop_store_raw(_prev_next, new_next); |
1 | 505 |
NOT_PRODUCT(_removed++); |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
506 |
_refs_list.dec_length(1); |
1 | 507 |
} |
508 |
||
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
509 |
// Make the Reference object active again. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
510 |
void DiscoveredListIterator::make_active() { |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
511 |
// The pre barrier for G1 is probably just needed for the old |
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
512 |
// reference processing behavior. Should we guard this with |
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
513 |
// ReferenceProcessor::pending_list_uses_discovered_field() ? |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
514 |
if (UseG1GC) { |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
515 |
HeapWord* next_addr = java_lang_ref_Reference::next_addr(_ref); |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
516 |
if (UseCompressedOops) { |
22496
383a5bdef99d
8029255: G1: Reference processing should not enqueue references on the shared SATB queue
pliden
parents:
20282
diff
changeset
|
517 |
oopDesc::bs()->write_ref_field_pre((narrowOop*)next_addr, NULL); |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
518 |
} else { |
22496
383a5bdef99d
8029255: G1: Reference processing should not enqueue references on the shared SATB queue
pliden
parents:
20282
diff
changeset
|
519 |
oopDesc::bs()->write_ref_field_pre((oop*)next_addr, NULL); |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
520 |
} |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
521 |
} |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
522 |
java_lang_ref_Reference::set_next_raw(_ref, NULL); |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
523 |
} |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
524 |
|
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
525 |
void DiscoveredListIterator::clear_referent() { |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
526 |
oop_store_raw(_referent_addr, NULL); |
1 | 527 |
} |
528 |
||
529 |
// NOTE: process_phase*() are largely similar, and at a high level |
|
530 |
// merely iterate over the extant list applying a predicate to |
|
531 |
// each of its elements and possibly removing that element from the |
|
532 |
// list and applying some further closures to that element. |
|
533 |
// We should consider the possibility of replacing these |
|
534 |
// process_phase*() methods by abstracting them into |
|
535 |
// a single general iterator invocation that receives appropriate |
|
536 |
// closures that accomplish this work. |
|
537 |
||
538 |
// (SoftReferences only) Traverse the list and remove any SoftReferences whose |
|
539 |
// referents are not alive, but that should be kept alive for policy reasons. |
|
540 |
// Keep alive the transitive closure of all such referents. |
|
541 |
void |
|
360
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178
diff
changeset
|
542 |
ReferenceProcessor::process_phase1(DiscoveredList& refs_list, |
1 | 543 |
ReferencePolicy* policy, |
544 |
BoolObjectClosure* is_alive, |
|
545 |
OopClosure* keep_alive, |
|
546 |
VoidClosure* complete_gc) { |
|
547 |
assert(policy != NULL, "Must have a non-NULL policy"); |
|
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
548 |
DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1 | 549 |
// Decide which softly reachable refs should be kept alive. |
550 |
while (iter.has_next()) { |
|
551 |
iter.load_ptrs(DEBUG_ONLY(!discovery_is_atomic() /* allow_null_referent */)); |
|
552 |
bool referent_is_dead = (iter.referent() != NULL) && !iter.is_referent_alive(); |
|
10683
4b5a5a507864
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
10670
diff
changeset
|
553 |
if (referent_is_dead && |
4b5a5a507864
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
10670
diff
changeset
|
554 |
!policy->should_clear_reference(iter.obj(), _soft_ref_timestamp_clock)) { |
1 | 555 |
if (TraceReferenceGC) { |
556 |
gclog_or_tty->print_cr("Dropping reference (" INTPTR_FORMAT ": %s" ") by policy", |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
557 |
(void *)iter.obj(), iter.obj()->klass()->internal_name()); |
1 | 558 |
} |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
559 |
// Remove Reference object from list |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
560 |
iter.remove(); |
1 | 561 |
// Make the Reference object active again |
562 |
iter.make_active(); |
|
563 |
// keep the referent around |
|
564 |
iter.make_referent_alive(); |
|
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
565 |
iter.move_to_next(); |
1 | 566 |
} else { |
567 |
iter.next(); |
|
568 |
} |
|
569 |
} |
|
570 |
// Close the reachable set |
|
571 |
complete_gc->do_void(); |
|
572 |
NOT_PRODUCT( |
|
573 |
if (PrintGCDetails && TraceReferenceGC) { |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
574 |
gclog_or_tty->print_cr(" Dropped %d dead Refs out of %d " |
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
575 |
"discovered Refs by policy, from list " INTPTR_FORMAT, |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
576 |
iter.removed(), iter.processed(), (address)refs_list.head()); |
1 | 577 |
} |
578 |
) |
|
579 |
} |
|
580 |
||
581 |
// Traverse the list and remove any Refs that are not active, or |
|
582 |
// whose referents are either alive or NULL. |
|
583 |
void |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
584 |
ReferenceProcessor::pp2_work(DiscoveredList& refs_list, |
1 | 585 |
BoolObjectClosure* is_alive, |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
586 |
OopClosure* keep_alive) { |
1 | 587 |
assert(discovery_is_atomic(), "Error"); |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
588 |
DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1 | 589 |
while (iter.has_next()) { |
590 |
iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
591 |
DEBUG_ONLY(oop next = java_lang_ref_Reference::next(iter.obj());) |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
592 |
assert(next == NULL, "Should not discover inactive Reference"); |
1 | 593 |
if (iter.is_referent_alive()) { |
594 |
if (TraceReferenceGC) { |
|
595 |
gclog_or_tty->print_cr("Dropping strongly reachable reference (" INTPTR_FORMAT ": %s)", |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
596 |
(void *)iter.obj(), iter.obj()->klass()->internal_name()); |
1 | 597 |
} |
598 |
// The referent is reachable after all. |
|
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
599 |
// Remove Reference object from list. |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
600 |
iter.remove(); |
1 | 601 |
// Update the referent pointer as necessary: Note that this |
602 |
// should not entail any recursive marking because the |
|
603 |
// referent must already have been traversed. |
|
604 |
iter.make_referent_alive(); |
|
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
605 |
iter.move_to_next(); |
1 | 606 |
} else { |
607 |
iter.next(); |
|
608 |
} |
|
609 |
} |
|
610 |
NOT_PRODUCT( |
|
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7420
diff
changeset
|
611 |
if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
612 |
gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
613 |
"Refs in discovered list " INTPTR_FORMAT, |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
614 |
iter.removed(), iter.processed(), (address)refs_list.head()); |
1 | 615 |
} |
616 |
) |
|
617 |
} |
|
618 |
||
619 |
void |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
620 |
ReferenceProcessor::pp2_work_concurrent_discovery(DiscoveredList& refs_list, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
621 |
BoolObjectClosure* is_alive, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
622 |
OopClosure* keep_alive, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
623 |
VoidClosure* complete_gc) { |
1 | 624 |
assert(!discovery_is_atomic(), "Error"); |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
625 |
DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1 | 626 |
while (iter.has_next()) { |
627 |
iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
628 |
HeapWord* next_addr = java_lang_ref_Reference::next_addr(iter.obj()); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
629 |
oop next = java_lang_ref_Reference::next(iter.obj()); |
1 | 630 |
if ((iter.referent() == NULL || iter.is_referent_alive() || |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
631 |
next != NULL)) { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
632 |
assert(next->is_oop_or_null(), "bad next field"); |
1 | 633 |
// Remove Reference object from list |
634 |
iter.remove(); |
|
635 |
// Trace the cohorts |
|
636 |
iter.make_referent_alive(); |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
637 |
if (UseCompressedOops) { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
638 |
keep_alive->do_oop((narrowOop*)next_addr); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
639 |
} else { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
640 |
keep_alive->do_oop((oop*)next_addr); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
641 |
} |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
642 |
iter.move_to_next(); |
1 | 643 |
} else { |
644 |
iter.next(); |
|
645 |
} |
|
646 |
} |
|
647 |
// Now close the newly reachable set |
|
648 |
complete_gc->do_void(); |
|
649 |
NOT_PRODUCT( |
|
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7420
diff
changeset
|
650 |
if (PrintGCDetails && TraceReferenceGC && (iter.processed() > 0)) { |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
651 |
gclog_or_tty->print_cr(" Dropped %d active Refs out of %d " |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
652 |
"Refs in discovered list " INTPTR_FORMAT, |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
653 |
iter.removed(), iter.processed(), (address)refs_list.head()); |
1 | 654 |
} |
655 |
) |
|
656 |
} |
|
657 |
||
658 |
// Traverse the list and process the referents, by either |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
659 |
// clearing them or keeping them (and their reachable |
1 | 660 |
// closure) alive. |
661 |
void |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
662 |
ReferenceProcessor::process_phase3(DiscoveredList& refs_list, |
1 | 663 |
bool clear_referent, |
664 |
BoolObjectClosure* is_alive, |
|
665 |
OopClosure* keep_alive, |
|
666 |
VoidClosure* complete_gc) { |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
667 |
ResourceMark rm; |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
668 |
DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1 | 669 |
while (iter.has_next()) { |
670 |
iter.update_discovered(); |
|
671 |
iter.load_ptrs(DEBUG_ONLY(false /* allow_null_referent */)); |
|
672 |
if (clear_referent) { |
|
673 |
// NULL out referent pointer |
|
674 |
iter.clear_referent(); |
|
675 |
} else { |
|
676 |
// keep the referent around |
|
677 |
iter.make_referent_alive(); |
|
678 |
} |
|
679 |
if (TraceReferenceGC) { |
|
680 |
gclog_or_tty->print_cr("Adding %sreference (" INTPTR_FORMAT ": %s) as pending", |
|
681 |
clear_referent ? "cleared " : "", |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
682 |
(void *)iter.obj(), iter.obj()->klass()->internal_name()); |
1 | 683 |
} |
684 |
assert(iter.obj()->is_oop(UseConcMarkSweepGC), "Adding a bad reference"); |
|
685 |
iter.next(); |
|
686 |
} |
|
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
687 |
// Remember to update the next pointer of the last ref. |
1 | 688 |
iter.update_discovered(); |
689 |
// Close the reachable set |
|
690 |
complete_gc->do_void(); |
|
691 |
} |
|
692 |
||
693 |
void |
|
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
694 |
ReferenceProcessor::clear_discovered_references(DiscoveredList& refs_list) { |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
695 |
oop obj = NULL; |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
696 |
oop next = refs_list.head(); |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
697 |
while (next != obj) { |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
698 |
obj = next; |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
699 |
next = java_lang_ref_Reference::discovered(obj); |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
700 |
java_lang_ref_Reference::set_discovered_raw(obj, NULL); |
1 | 701 |
} |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
702 |
refs_list.set_head(NULL); |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
703 |
refs_list.set_length(0); |
1 | 704 |
} |
705 |
||
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
706 |
void |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
707 |
ReferenceProcessor::abandon_partial_discovered_list(DiscoveredList& refs_list) { |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
708 |
clear_discovered_references(refs_list); |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
709 |
} |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
710 |
|
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
711 |
void ReferenceProcessor::abandon_partial_discovery() { |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
712 |
// loop over the lists |
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
713 |
for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
714 |
if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
715 |
gclog_or_tty->print_cr("\nAbandoning %s discovered list", list_name(i)); |
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
716 |
} |
10747
dfdb9eb56e49
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
10683
diff
changeset
|
717 |
abandon_partial_discovered_list(_discovered_refs[i]); |
1 | 718 |
} |
719 |
} |
|
720 |
||
721 |
class RefProcPhase1Task: public AbstractRefProcTaskExecutor::ProcessTask { |
|
722 |
public: |
|
723 |
RefProcPhase1Task(ReferenceProcessor& ref_processor, |
|
724 |
DiscoveredList refs_lists[], |
|
725 |
ReferencePolicy* policy, |
|
726 |
bool marks_oops_alive) |
|
727 |
: ProcessTask(ref_processor, refs_lists, marks_oops_alive), |
|
728 |
_policy(policy) |
|
729 |
{ } |
|
730 |
virtual void work(unsigned int i, BoolObjectClosure& is_alive, |
|
731 |
OopClosure& keep_alive, |
|
732 |
VoidClosure& complete_gc) |
|
733 |
{ |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
734 |
Thread* thr = Thread::current(); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
735 |
int refs_list_index = ((WorkerThread*)thr)->id(); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
736 |
_ref_processor.process_phase1(_refs_lists[refs_list_index], _policy, |
1 | 737 |
&is_alive, &keep_alive, &complete_gc); |
738 |
} |
|
739 |
private: |
|
740 |
ReferencePolicy* _policy; |
|
741 |
}; |
|
742 |
||
743 |
class RefProcPhase2Task: public AbstractRefProcTaskExecutor::ProcessTask { |
|
744 |
public: |
|
745 |
RefProcPhase2Task(ReferenceProcessor& ref_processor, |
|
746 |
DiscoveredList refs_lists[], |
|
747 |
bool marks_oops_alive) |
|
748 |
: ProcessTask(ref_processor, refs_lists, marks_oops_alive) |
|
749 |
{ } |
|
750 |
virtual void work(unsigned int i, BoolObjectClosure& is_alive, |
|
751 |
OopClosure& keep_alive, |
|
752 |
VoidClosure& complete_gc) |
|
753 |
{ |
|
754 |
_ref_processor.process_phase2(_refs_lists[i], |
|
755 |
&is_alive, &keep_alive, &complete_gc); |
|
756 |
} |
|
757 |
}; |
|
758 |
||
759 |
class RefProcPhase3Task: public AbstractRefProcTaskExecutor::ProcessTask { |
|
760 |
public: |
|
761 |
RefProcPhase3Task(ReferenceProcessor& ref_processor, |
|
762 |
DiscoveredList refs_lists[], |
|
763 |
bool clear_referent, |
|
764 |
bool marks_oops_alive) |
|
765 |
: ProcessTask(ref_processor, refs_lists, marks_oops_alive), |
|
766 |
_clear_referent(clear_referent) |
|
767 |
{ } |
|
768 |
virtual void work(unsigned int i, BoolObjectClosure& is_alive, |
|
769 |
OopClosure& keep_alive, |
|
770 |
VoidClosure& complete_gc) |
|
771 |
{ |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
772 |
// Don't use "refs_list_index" calculated in this way because |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
773 |
// balance_queues() has moved the Ref's into the first n queues. |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
774 |
// Thread* thr = Thread::current(); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
775 |
// int refs_list_index = ((WorkerThread*)thr)->id(); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
776 |
// _ref_processor.process_phase3(_refs_lists[refs_list_index], _clear_referent, |
1 | 777 |
_ref_processor.process_phase3(_refs_lists[i], _clear_referent, |
778 |
&is_alive, &keep_alive, &complete_gc); |
|
779 |
} |
|
780 |
private: |
|
781 |
bool _clear_referent; |
|
782 |
}; |
|
783 |
||
784 |
// Balances reference queues. |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
785 |
// Move entries from all queues[0, 1, ..., _max_num_q-1] to |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
786 |
// queues[0, 1, ..., _num_q-1] because only the first _num_q |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
787 |
// corresponding to the active workers will be processed. |
1 | 788 |
void ReferenceProcessor::balance_queues(DiscoveredList ref_lists[]) |
789 |
{ |
|
790 |
// calculate total length |
|
791 |
size_t total_refs = 0; |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
792 |
if (TraceReferenceGC && PrintGCDetails) { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
793 |
gclog_or_tty->print_cr("\nBalance ref_lists "); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
794 |
} |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
795 |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
796 |
for (uint i = 0; i < _max_num_q; ++i) { |
1 | 797 |
total_refs += ref_lists[i].length(); |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
798 |
if (TraceReferenceGC && PrintGCDetails) { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
799 |
gclog_or_tty->print("%d ", ref_lists[i].length()); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
800 |
} |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
801 |
} |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
802 |
if (TraceReferenceGC && PrintGCDetails) { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
803 |
gclog_or_tty->print_cr(" = %d", total_refs); |
1 | 804 |
} |
805 |
size_t avg_refs = total_refs / _num_q + 1; |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
806 |
uint to_idx = 0; |
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
807 |
for (uint from_idx = 0; from_idx < _max_num_q; from_idx++) { |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
808 |
bool move_all = false; |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
809 |
if (from_idx >= _num_q) { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
810 |
move_all = ref_lists[from_idx].length() > 0; |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
811 |
} |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
812 |
while ((ref_lists[from_idx].length() > avg_refs) || |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
813 |
move_all) { |
1 | 814 |
assert(to_idx < _num_q, "Sanity Check!"); |
815 |
if (ref_lists[to_idx].length() < avg_refs) { |
|
816 |
// move superfluous refs |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
817 |
size_t refs_to_move; |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
818 |
// Move all the Ref's if the from queue will not be processed. |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
819 |
if (move_all) { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
820 |
refs_to_move = MIN2(ref_lists[from_idx].length(), |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
821 |
avg_refs - ref_lists[to_idx].length()); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
822 |
} else { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
823 |
refs_to_move = MIN2(ref_lists[from_idx].length() - avg_refs, |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
824 |
avg_refs - ref_lists[to_idx].length()); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
825 |
} |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
826 |
|
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
827 |
assert(refs_to_move > 0, "otherwise the code below will fail"); |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
828 |
|
1 | 829 |
oop move_head = ref_lists[from_idx].head(); |
830 |
oop move_tail = move_head; |
|
831 |
oop new_head = move_head; |
|
832 |
// find an element to split the list on |
|
833 |
for (size_t j = 0; j < refs_to_move; ++j) { |
|
834 |
move_tail = new_head; |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
835 |
new_head = java_lang_ref_Reference::discovered(new_head); |
1 | 836 |
} |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
837 |
|
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
838 |
// Add the chain to the to list. |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
839 |
if (ref_lists[to_idx].head() == NULL) { |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
840 |
// to list is empty. Make a loop at the end. |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
841 |
java_lang_ref_Reference::set_discovered_raw(move_tail, move_tail); |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
842 |
} else { |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
843 |
java_lang_ref_Reference::set_discovered_raw(move_tail, ref_lists[to_idx].head()); |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
844 |
} |
1 | 845 |
ref_lists[to_idx].set_head(move_head); |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
846 |
ref_lists[to_idx].inc_length(refs_to_move); |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
847 |
|
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
848 |
// Remove the chain from the from list. |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
849 |
if (move_tail == new_head) { |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
850 |
// We found the end of the from list. |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
851 |
ref_lists[from_idx].set_head(NULL); |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
852 |
} else { |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
853 |
ref_lists[from_idx].set_head(new_head); |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
854 |
} |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
855 |
ref_lists[from_idx].dec_length(refs_to_move); |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
856 |
if (ref_lists[from_idx].length() == 0) { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
857 |
break; |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
858 |
} |
1 | 859 |
} else { |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
860 |
to_idx = (to_idx + 1) % _num_q; |
1 | 861 |
} |
862 |
} |
|
863 |
} |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
864 |
#ifdef ASSERT |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
865 |
size_t balanced_total_refs = 0; |
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
866 |
for (uint i = 0; i < _max_num_q; ++i) { |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
867 |
balanced_total_refs += ref_lists[i].length(); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
868 |
if (TraceReferenceGC && PrintGCDetails) { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
869 |
gclog_or_tty->print("%d ", ref_lists[i].length()); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
870 |
} |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
871 |
} |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
872 |
if (TraceReferenceGC && PrintGCDetails) { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
873 |
gclog_or_tty->print_cr(" = %d", balanced_total_refs); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
874 |
gclog_or_tty->flush(); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
875 |
} |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
876 |
assert(total_refs == balanced_total_refs, "Balancing was incomplete"); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
877 |
#endif |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
878 |
} |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
879 |
|
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
880 |
void ReferenceProcessor::balance_all_queues() { |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
881 |
balance_queues(_discoveredSoftRefs); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
882 |
balance_queues(_discoveredWeakRefs); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
883 |
balance_queues(_discoveredFinalRefs); |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
884 |
balance_queues(_discoveredPhantomRefs); |
1 | 885 |
} |
886 |
||
18025 | 887 |
size_t |
1 | 888 |
ReferenceProcessor::process_discovered_reflist( |
889 |
DiscoveredList refs_lists[], |
|
890 |
ReferencePolicy* policy, |
|
891 |
bool clear_referent, |
|
892 |
BoolObjectClosure* is_alive, |
|
893 |
OopClosure* keep_alive, |
|
894 |
VoidClosure* complete_gc, |
|
895 |
AbstractRefProcTaskExecutor* task_executor) |
|
896 |
{ |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
897 |
bool mt_processing = task_executor != NULL && _processing_is_mt; |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
898 |
// If discovery used MT and a dynamic number of GC threads, then |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
899 |
// the queues must be balanced for correctness if fewer than the |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
900 |
// maximum number of queues were used. The number of queue used |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
901 |
// during discovery may be different than the number to be used |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
902 |
// for processing so don't depend of _num_q < _max_num_q as part |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
903 |
// of the test. |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
904 |
bool must_balance = _discovery_is_mt; |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
905 |
|
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
906 |
if ((mt_processing && ParallelRefProcBalancingEnabled) || |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
907 |
must_balance) { |
1 | 908 |
balance_queues(refs_lists); |
909 |
} |
|
18025 | 910 |
|
911 |
size_t total_list_count = total_count(refs_lists); |
|
912 |
||
1 | 913 |
if (PrintReferenceGC && PrintGCDetails) { |
18025 | 914 |
gclog_or_tty->print(", %u refs", total_list_count); |
1 | 915 |
} |
916 |
||
917 |
// Phase 1 (soft refs only): |
|
918 |
// . Traverse the list and remove any SoftReferences whose |
|
919 |
// referents are not alive, but that should be kept alive for |
|
920 |
// policy reasons. Keep alive the transitive closure of all |
|
921 |
// such referents. |
|
922 |
if (policy != NULL) { |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
923 |
if (mt_processing) { |
1 | 924 |
RefProcPhase1Task phase1(*this, refs_lists, policy, true /*marks_oops_alive*/); |
925 |
task_executor->execute(phase1); |
|
926 |
} else { |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
927 |
for (uint i = 0; i < _max_num_q; i++) { |
1 | 928 |
process_phase1(refs_lists[i], policy, |
929 |
is_alive, keep_alive, complete_gc); |
|
930 |
} |
|
931 |
} |
|
932 |
} else { // policy == NULL |
|
933 |
assert(refs_lists != _discoveredSoftRefs, |
|
934 |
"Policy must be specified for soft references."); |
|
935 |
} |
|
936 |
||
937 |
// Phase 2: |
|
938 |
// . Traverse the list and remove any refs whose referents are alive. |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
939 |
if (mt_processing) { |
1 | 940 |
RefProcPhase2Task phase2(*this, refs_lists, !discovery_is_atomic() /*marks_oops_alive*/); |
941 |
task_executor->execute(phase2); |
|
942 |
} else { |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
943 |
for (uint i = 0; i < _max_num_q; i++) { |
1 | 944 |
process_phase2(refs_lists[i], is_alive, keep_alive, complete_gc); |
945 |
} |
|
946 |
} |
|
947 |
||
948 |
// Phase 3: |
|
949 |
// . Traverse the list and process referents as appropriate. |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
950 |
if (mt_processing) { |
1 | 951 |
RefProcPhase3Task phase3(*this, refs_lists, clear_referent, true /*marks_oops_alive*/); |
952 |
task_executor->execute(phase3); |
|
953 |
} else { |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
954 |
for (uint i = 0; i < _max_num_q; i++) { |
1 | 955 |
process_phase3(refs_lists[i], clear_referent, |
956 |
is_alive, keep_alive, complete_gc); |
|
957 |
} |
|
958 |
} |
|
18025 | 959 |
|
960 |
return total_list_count; |
|
1 | 961 |
} |
962 |
||
963 |
void ReferenceProcessor::clean_up_discovered_references() { |
|
964 |
// loop over the lists |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
965 |
for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7420
diff
changeset
|
966 |
if (TraceReferenceGC && PrintGCDetails && ((i % _max_num_q) == 0)) { |
1 | 967 |
gclog_or_tty->print_cr( |
968 |
"\nScrubbing %s discovered list of Null referents", |
|
969 |
list_name(i)); |
|
970 |
} |
|
10747
dfdb9eb56e49
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
10683
diff
changeset
|
971 |
clean_up_discovered_reflist(_discovered_refs[i]); |
1 | 972 |
} |
973 |
} |
|
974 |
||
975 |
void ReferenceProcessor::clean_up_discovered_reflist(DiscoveredList& refs_list) { |
|
976 |
assert(!discovery_is_atomic(), "Else why call this method?"); |
|
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
977 |
DiscoveredListIterator iter(refs_list, NULL, NULL); |
1 | 978 |
while (iter.has_next()) { |
979 |
iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
980 |
oop next = java_lang_ref_Reference::next(iter.obj()); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
981 |
assert(next->is_oop_or_null(), "bad next field"); |
1 | 982 |
// If referent has been cleared or Reference is not active, |
983 |
// drop it. |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
984 |
if (iter.referent() == NULL || next != NULL) { |
1 | 985 |
debug_only( |
986 |
if (PrintGCDetails && TraceReferenceGC) { |
|
987 |
gclog_or_tty->print_cr("clean_up_discovered_list: Dropping Reference: " |
|
988 |
INTPTR_FORMAT " with next field: " INTPTR_FORMAT |
|
989 |
" and referent: " INTPTR_FORMAT, |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
990 |
(void *)iter.obj(), (void *)next, (void *)iter.referent()); |
1 | 991 |
} |
992 |
) |
|
993 |
// Remove Reference object from list |
|
994 |
iter.remove(); |
|
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
995 |
iter.move_to_next(); |
1 | 996 |
} else { |
997 |
iter.next(); |
|
998 |
} |
|
999 |
} |
|
1000 |
NOT_PRODUCT( |
|
1001 |
if (PrintGCDetails && TraceReferenceGC) { |
|
1002 |
gclog_or_tty->print( |
|
1003 |
" Removed %d Refs with NULL referents out of %d discovered Refs", |
|
1004 |
iter.removed(), iter.processed()); |
|
1005 |
} |
|
1006 |
) |
|
1007 |
} |
|
1008 |
||
1009 |
inline DiscoveredList* ReferenceProcessor::get_discovered_list(ReferenceType rt) { |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
1010 |
uint id = 0; |
1 | 1011 |
// Determine the queue index to use for this object. |
1012 |
if (_discovery_is_mt) { |
|
1013 |
// During a multi-threaded discovery phase, |
|
1014 |
// each thread saves to its "own" list. |
|
1015 |
Thread* thr = Thread::current(); |
|
7399
4ecd771fa2d1
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
7397
diff
changeset
|
1016 |
id = thr->as_Worker_thread()->id(); |
1 | 1017 |
} else { |
1018 |
// single-threaded discovery, we save in round-robin |
|
1019 |
// fashion to each of the lists. |
|
1020 |
if (_processing_is_mt) { |
|
1021 |
id = next_id(); |
|
1022 |
} |
|
1023 |
} |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
1024 |
assert(0 <= id && id < _max_num_q, "Id is out-of-bounds (call Freud?)"); |
1 | 1025 |
|
1026 |
// Get the discovered queue to which we will add |
|
1027 |
DiscoveredList* list = NULL; |
|
1028 |
switch (rt) { |
|
1029 |
case REF_OTHER: |
|
1030 |
// Unknown reference type, no special treatment |
|
1031 |
break; |
|
1032 |
case REF_SOFT: |
|
1033 |
list = &_discoveredSoftRefs[id]; |
|
1034 |
break; |
|
1035 |
case REF_WEAK: |
|
1036 |
list = &_discoveredWeakRefs[id]; |
|
1037 |
break; |
|
1038 |
case REF_FINAL: |
|
1039 |
list = &_discoveredFinalRefs[id]; |
|
1040 |
break; |
|
1041 |
case REF_PHANTOM: |
|
1042 |
list = &_discoveredPhantomRefs[id]; |
|
1043 |
break; |
|
1044 |
case REF_NONE: |
|
13738
d67be49a5beb
7195833: NPG: Rename instanceClassLoaderKlass, instanceRefKlass and instanceMirrorKlass
coleenp
parents:
13728
diff
changeset
|
1045 |
// we should not reach here if we are an InstanceRefKlass |
1 | 1046 |
default: |
1047 |
ShouldNotReachHere(); |
|
1048 |
} |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
1049 |
if (TraceReferenceGC && PrintGCDetails) { |
7399
4ecd771fa2d1
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
7397
diff
changeset
|
1050 |
gclog_or_tty->print_cr("Thread %d gets list " INTPTR_FORMAT, id, list); |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
1051 |
} |
1 | 1052 |
return list; |
1053 |
} |
|
1054 |
||
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1055 |
inline void |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1056 |
ReferenceProcessor::add_to_discovered_list_mt(DiscoveredList& refs_list, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1057 |
oop obj, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1058 |
HeapWord* discovered_addr) { |
1 | 1059 |
assert(_discovery_is_mt, "!_discovery_is_mt should have been handled by caller"); |
1060 |
// First we must make sure this object is only enqueued once. CAS in a non null |
|
1061 |
// discovered_addr. |
|
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
1062 |
oop current_head = refs_list.head(); |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
1063 |
// The last ref must have its discovered field pointing to itself. |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
1064 |
oop next_discovered = (current_head != NULL) ? current_head : obj; |
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
1065 |
|
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
1066 |
oop retest = oopDesc::atomic_compare_exchange_oop(next_discovered, discovered_addr, |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1067 |
NULL); |
1 | 1068 |
if (retest == NULL) { |
1069 |
// This thread just won the right to enqueue the object. |
|
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1070 |
// We have separate lists for enqueueing, so no synchronization |
1 | 1071 |
// is necessary. |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1072 |
refs_list.set_head(obj); |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1073 |
refs_list.inc_length(1); |
7399
4ecd771fa2d1
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
7397
diff
changeset
|
1074 |
|
4ecd771fa2d1
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
7397
diff
changeset
|
1075 |
if (TraceReferenceGC) { |
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1076 |
gclog_or_tty->print_cr("Discovered reference (mt) (" INTPTR_FORMAT ": %s)", |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
1077 |
(void *)obj, obj->klass()->internal_name()); |
7399
4ecd771fa2d1
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
7397
diff
changeset
|
1078 |
} |
1 | 1079 |
} else { |
1080 |
// If retest was non NULL, another thread beat us to it: |
|
1081 |
// The reference has already been discovered... |
|
1082 |
if (TraceReferenceGC) { |
|
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1083 |
gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
1084 |
(void *)obj, obj->klass()->internal_name()); |
1 | 1085 |
} |
1086 |
} |
|
1087 |
} |
|
1088 |
||
7420
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1089 |
#ifndef PRODUCT |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1090 |
// Non-atomic (i.e. concurrent) discovery might allow us |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1091 |
// to observe j.l.References with NULL referents, being those |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1092 |
// cleared concurrently by mutators during (or after) discovery. |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1093 |
void ReferenceProcessor::verify_referent(oop obj) { |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1094 |
bool da = discovery_is_atomic(); |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1095 |
oop referent = java_lang_ref_Reference::referent(obj); |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1096 |
assert(da ? referent->is_oop() : referent->is_oop_or_null(), |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1097 |
err_msg("Bad referent " INTPTR_FORMAT " found in Reference " |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1098 |
INTPTR_FORMAT " during %satomic discovery ", |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
1099 |
(void *)referent, (void *)obj, da ? "" : "non-")); |
7420
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1100 |
} |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1101 |
#endif |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1102 |
|
1 | 1103 |
// We mention two of several possible choices here: |
1104 |
// #0: if the reference object is not in the "originating generation" |
|
1105 |
// (or part of the heap being collected, indicated by our "span" |
|
1106 |
// we don't treat it specially (i.e. we scan it as we would |
|
1107 |
// a normal oop, treating its references as strong references). |
|
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1108 |
// This means that references can't be discovered unless their |
1 | 1109 |
// referent is also in the same span. This is the simplest, |
1110 |
// most "local" and most conservative approach, albeit one |
|
1111 |
// that may cause weak references to be enqueued least promptly. |
|
1112 |
// We call this choice the "ReferenceBasedDiscovery" policy. |
|
1113 |
// #1: the reference object may be in any generation (span), but if |
|
1114 |
// the referent is in the generation (span) being currently collected |
|
1115 |
// then we can discover the reference object, provided |
|
1116 |
// the object has not already been discovered by |
|
1117 |
// a different concurrently running collector (as may be the |
|
1118 |
// case, for instance, if the reference object is in CMS and |
|
1119 |
// the referent in DefNewGeneration), and provided the processing |
|
1120 |
// of this reference object by the current collector will |
|
1121 |
// appear atomic to every other collector in the system. |
|
1122 |
// (Thus, for instance, a concurrent collector may not |
|
1123 |
// discover references in other generations even if the |
|
1124 |
// referent is in its own generation). This policy may, |
|
1125 |
// in certain cases, enqueue references somewhat sooner than |
|
1126 |
// might Policy #0 above, but at marginally increased cost |
|
1127 |
// and complexity in processing these references. |
|
1128 |
// We call this choice the "RefeferentBasedDiscovery" policy. |
|
1129 |
bool ReferenceProcessor::discover_reference(oop obj, ReferenceType rt) { |
|
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1130 |
// Make sure we are discovering refs (rather than processing discovered refs). |
1 | 1131 |
if (!_discovering_refs || !RegisterReferences) { |
1132 |
return false; |
|
1133 |
} |
|
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1134 |
// We only discover active references. |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1135 |
oop next = java_lang_ref_Reference::next(obj); |
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1136 |
if (next != NULL) { // Ref is no longer active |
1 | 1137 |
return false; |
1138 |
} |
|
1139 |
||
1140 |
HeapWord* obj_addr = (HeapWord*)obj; |
|
1141 |
if (RefDiscoveryPolicy == ReferenceBasedDiscovery && |
|
1142 |
!_span.contains(obj_addr)) { |
|
1143 |
// Reference is not in the originating generation; |
|
1144 |
// don't treat it specially (i.e. we want to scan it as a normal |
|
1145 |
// object with strong references). |
|
1146 |
return false; |
|
1147 |
} |
|
1148 |
||
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1149 |
// We only discover references whose referents are not (yet) |
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1150 |
// known to be strongly reachable. |
1 | 1151 |
if (is_alive_non_header() != NULL) { |
7420
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1152 |
verify_referent(obj); |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1153 |
if (is_alive_non_header()->do_object_b(java_lang_ref_Reference::referent(obj))) { |
1 | 1154 |
return false; // referent is reachable |
1155 |
} |
|
1156 |
} |
|
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1157 |
if (rt == REF_SOFT) { |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1158 |
// For soft refs we can decide now if these are not |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1159 |
// current candidates for clearing, in which case we |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1160 |
// can mark through them now, rather than delaying that |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1161 |
// to the reference-processing phase. Since all current |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1162 |
// time-stamp policies advance the soft-ref clock only |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1163 |
// at a major collection cycle, this is always currently |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1164 |
// accurate. |
10683
4b5a5a507864
7098282: G1: assert(interval >= 0) failed: Sanity check, referencePolicy.cpp: 76
johnc
parents:
10670
diff
changeset
|
1165 |
if (!_current_soft_ref_policy->should_clear_reference(obj, _soft_ref_timestamp_clock)) { |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1166 |
return false; |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1167 |
} |
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
1605
diff
changeset
|
1168 |
} |
1 | 1169 |
|
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
1170 |
ResourceMark rm; // Needed for tracing. |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
1171 |
|
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
1172 |
HeapWord* const discovered_addr = java_lang_ref_Reference::discovered_addr(obj); |
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
1173 |
const oop discovered = java_lang_ref_Reference::discovered(obj); |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1174 |
assert(discovered->is_oop_or_null(), "bad discovered field"); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1175 |
if (discovered != NULL) { |
1 | 1176 |
// The reference has already been discovered... |
1177 |
if (TraceReferenceGC) { |
|
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1178 |
gclog_or_tty->print_cr("Already discovered reference (" INTPTR_FORMAT ": %s)", |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
1179 |
(void *)obj, obj->klass()->internal_name()); |
1 | 1180 |
} |
1181 |
if (RefDiscoveryPolicy == ReferentBasedDiscovery) { |
|
1182 |
// assumes that an object is not processed twice; |
|
1183 |
// if it's been already discovered it must be on another |
|
1184 |
// generation's discovered list; so we won't discover it. |
|
1185 |
return false; |
|
1186 |
} else { |
|
1187 |
assert(RefDiscoveryPolicy == ReferenceBasedDiscovery, |
|
1188 |
"Unrecognized policy"); |
|
1189 |
// Check assumption that an object is not potentially |
|
1190 |
// discovered twice except by concurrent collectors that potentially |
|
1191 |
// trace the same Reference object twice. |
|
7399
4ecd771fa2d1
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
7397
diff
changeset
|
1192 |
assert(UseConcMarkSweepGC || UseG1GC, |
4ecd771fa2d1
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
7397
diff
changeset
|
1193 |
"Only possible with a concurrent marking collector"); |
1 | 1194 |
return true; |
1195 |
} |
|
1196 |
} |
|
1197 |
||
1198 |
if (RefDiscoveryPolicy == ReferentBasedDiscovery) { |
|
7420
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1199 |
verify_referent(obj); |
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1200 |
// Discover if and only if EITHER: |
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1201 |
// .. reference is in our span, OR |
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1202 |
// .. we are an atomic collector and referent is in our span |
1 | 1203 |
if (_span.contains(obj_addr) || |
7420
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1204 |
(discovery_is_atomic() && |
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1205 |
_span.contains(java_lang_ref_Reference::referent(obj)))) { |
1 | 1206 |
// should_enqueue = true; |
1207 |
} else { |
|
1208 |
return false; |
|
1209 |
} |
|
1210 |
} else { |
|
1211 |
assert(RefDiscoveryPolicy == ReferenceBasedDiscovery && |
|
1212 |
_span.contains(obj_addr), "code inconsistency"); |
|
1213 |
} |
|
1214 |
||
1215 |
// Get the right type of discovered queue head. |
|
1216 |
DiscoveredList* list = get_discovered_list(rt); |
|
1217 |
if (list == NULL) { |
|
1218 |
return false; // nothing special needs to be done |
|
1219 |
} |
|
1220 |
||
1221 |
if (_discovery_is_mt) { |
|
1222 |
add_to_discovered_list_mt(*list, obj, discovered_addr); |
|
1223 |
} else { |
|
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
1224 |
// We do a raw store here: the field will be visited later when processing |
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
1225 |
// the discovered references. |
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
1226 |
oop current_head = list->head(); |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
1227 |
// The last ref must have its discovered field pointing to itself. |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
1228 |
oop next_discovered = (current_head != NULL) ? current_head : obj; |
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
1229 |
|
1374
4c24294029a9
6711316: Open source the Garbage-First garbage collector
ysr
parents:
360
diff
changeset
|
1230 |
assert(discovered == NULL, "control point invariant"); |
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
1231 |
oop_store_raw(discovered_addr, next_discovered); |
1 | 1232 |
list->set_head(obj); |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1233 |
list->inc_length(1); |
1 | 1234 |
|
7399
4ecd771fa2d1
6983204: G1: Nightly test nsk/regression/b4958615 failing with +ExplicitGCInvokesConcurrent
johnc
parents:
7397
diff
changeset
|
1235 |
if (TraceReferenceGC) { |
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1236 |
gclog_or_tty->print_cr("Discovered reference (" INTPTR_FORMAT ": %s)", |
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
1237 |
(void *)obj, obj->klass()->internal_name()); |
1 | 1238 |
} |
1239 |
} |
|
10526
3e92f211533f
4965777: GC changes to support use of discovered field for pending references
ysr
parents:
10524
diff
changeset
|
1240 |
assert(obj->is_oop(), "Discovered a bad reference"); |
7420
24071b15dde6
7005259: CMS: BubbleUpRef asserts referent(obj)->is_oop() failed: Enqueued a bad referent
ysr
parents:
7399
diff
changeset
|
1241 |
verify_referent(obj); |
1 | 1242 |
return true; |
1243 |
} |
|
1244 |
||
1245 |
// Preclean the discovered references by removing those |
|
1246 |
// whose referents are alive, and by marking from those that |
|
1247 |
// are not active. These lists can be handled here |
|
1248 |
// in any order and, indeed, concurrently. |
|
1249 |
void ReferenceProcessor::preclean_discovered_references( |
|
1250 |
BoolObjectClosure* is_alive, |
|
1251 |
OopClosure* keep_alive, |
|
1252 |
VoidClosure* complete_gc, |
|
18025 | 1253 |
YieldClosure* yield, |
1254 |
GCTimer* gc_timer) { |
|
1 | 1255 |
|
1256 |
NOT_PRODUCT(verify_ok_to_handle_reflists()); |
|
1257 |
||
1258 |
// Soft references |
|
1259 |
{ |
|
18025 | 1260 |
GCTraceTime tt("Preclean SoftReferences", PrintGCDetails && PrintReferenceGC, |
1261 |
false, gc_timer); |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
1262 |
for (uint i = 0; i < _max_num_q; i++) { |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1263 |
if (yield->should_return()) { |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1264 |
return; |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1265 |
} |
1 | 1266 |
preclean_discovered_reflist(_discoveredSoftRefs[i], is_alive, |
1267 |
keep_alive, complete_gc, yield); |
|
1268 |
} |
|
1269 |
} |
|
1270 |
||
1271 |
// Weak references |
|
1272 |
{ |
|
18025 | 1273 |
GCTraceTime tt("Preclean WeakReferences", PrintGCDetails && PrintReferenceGC, |
1274 |
false, gc_timer); |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
1275 |
for (uint i = 0; i < _max_num_q; i++) { |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1276 |
if (yield->should_return()) { |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1277 |
return; |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1278 |
} |
1 | 1279 |
preclean_discovered_reflist(_discoveredWeakRefs[i], is_alive, |
1280 |
keep_alive, complete_gc, yield); |
|
1281 |
} |
|
1282 |
} |
|
1283 |
||
1284 |
// Final references |
|
1285 |
{ |
|
18025 | 1286 |
GCTraceTime tt("Preclean FinalReferences", PrintGCDetails && PrintReferenceGC, |
1287 |
false, gc_timer); |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
1288 |
for (uint i = 0; i < _max_num_q; i++) { |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1289 |
if (yield->should_return()) { |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1290 |
return; |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1291 |
} |
1 | 1292 |
preclean_discovered_reflist(_discoveredFinalRefs[i], is_alive, |
1293 |
keep_alive, complete_gc, yield); |
|
1294 |
} |
|
1295 |
} |
|
1296 |
||
1297 |
// Phantom references |
|
1298 |
{ |
|
18025 | 1299 |
GCTraceTime tt("Preclean PhantomReferences", PrintGCDetails && PrintReferenceGC, |
1300 |
false, gc_timer); |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
1301 |
for (uint i = 0; i < _max_num_q; i++) { |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1302 |
if (yield->should_return()) { |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1303 |
return; |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1304 |
} |
1 | 1305 |
preclean_discovered_reflist(_discoveredPhantomRefs[i], is_alive, |
1306 |
keep_alive, complete_gc, yield); |
|
1307 |
} |
|
1308 |
} |
|
1309 |
} |
|
1310 |
||
1311 |
// Walk the given discovered ref list, and remove all reference objects |
|
1312 |
// whose referents are still alive, whose referents are NULL or which |
|
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1313 |
// are not active (have a non-NULL next field). NOTE: When we are |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1314 |
// thus precleaning the ref lists (which happens single-threaded today), |
22551 | 1315 |
// we do not disable refs discovery to honor the correct semantics of |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1316 |
// java.lang.Reference. As a result, we need to be careful below |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1317 |
// that ref removal steps interleave safely with ref discovery steps |
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1318 |
// (in this thread). |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1319 |
void |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1320 |
ReferenceProcessor::preclean_discovered_reflist(DiscoveredList& refs_list, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1321 |
BoolObjectClosure* is_alive, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1322 |
OopClosure* keep_alive, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1323 |
VoidClosure* complete_gc, |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1324 |
YieldClosure* yield) { |
24845
e8b8894a77df
8043239: G1: Missing post barrier in processing of j.l.ref.Reference objects
brutisso
parents:
24424
diff
changeset
|
1325 |
DiscoveredListIterator iter(refs_list, keep_alive, is_alive); |
1 | 1326 |
while (iter.has_next()) { |
1327 |
iter.load_ptrs(DEBUG_ONLY(true /* allow_null_referent */)); |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1328 |
oop obj = iter.obj(); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1329 |
oop next = java_lang_ref_Reference::next(obj); |
1 | 1330 |
if (iter.referent() == NULL || iter.is_referent_alive() || |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1331 |
next != NULL) { |
1 | 1332 |
// The referent has been cleared, or is alive, or the Reference is not |
1333 |
// active; we need to trace and mark its cohort. |
|
1334 |
if (TraceReferenceGC) { |
|
1335 |
gclog_or_tty->print_cr("Precleaning Reference (" INTPTR_FORMAT ": %s)", |
|
20282
7f9cbdf89af2
7195622: CheckUnhandledOops has limited usefulness now
hseigel
parents:
18025
diff
changeset
|
1336 |
(void *)iter.obj(), iter.obj()->klass()->internal_name()); |
1 | 1337 |
} |
1338 |
// Remove Reference object from list |
|
1339 |
iter.remove(); |
|
1340 |
// Keep alive its cohort. |
|
1341 |
iter.make_referent_alive(); |
|
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1342 |
if (UseCompressedOops) { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1343 |
narrowOop* next_addr = (narrowOop*)java_lang_ref_Reference::next_addr(obj); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1344 |
keep_alive->do_oop(next_addr); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1345 |
} else { |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1346 |
oop* next_addr = (oop*)java_lang_ref_Reference::next_addr(obj); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1347 |
keep_alive->do_oop(next_addr); |
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
178
diff
changeset
|
1348 |
} |
1605
6b43d186eb8d
6722113: CMS: Incorrect overflow handling during precleaning of Reference lists
ysr
parents:
1388
diff
changeset
|
1349 |
iter.move_to_next(); |
1 | 1350 |
} else { |
1351 |
iter.next(); |
|
1352 |
} |
|
1353 |
} |
|
1354 |
// Close the reachable set |
|
1355 |
complete_gc->do_void(); |
|
1356 |
||
1357 |
NOT_PRODUCT( |
|
8688
493d12ccc6db
6668573: CMS: reference processing crash if ParallelCMSThreads > ParallelGCThreads
ysr
parents:
7420
diff
changeset
|
1358 |
if (PrintGCDetails && PrintReferenceGC && (iter.processed() > 0)) { |
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
1359 |
gclog_or_tty->print_cr(" Dropped %d Refs out of %d " |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
1360 |
"Refs in discovered list " INTPTR_FORMAT, |
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
1361 |
iter.removed(), iter.processed(), (address)refs_list.head()); |
1 | 1362 |
} |
1363 |
) |
|
1364 |
} |
|
1365 |
||
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
1366 |
const char* ReferenceProcessor::list_name(uint i) { |
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
1367 |
assert(i >= 0 && i <= _max_num_q * number_of_subclasses_of_ref(), |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
1368 |
"Out of bounds index"); |
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10526
diff
changeset
|
1369 |
|
6759
67b1a69ef5aa
6984287: Regularize how GC parallel workers are specified.
jmasa
parents:
5547
diff
changeset
|
1370 |
int j = i / _max_num_q; |
1 | 1371 |
switch (j) { |
1372 |
case 0: return "SoftRef"; |
|
1373 |
case 1: return "WeakRef"; |
|
1374 |
case 2: return "FinalRef"; |
|
1375 |
case 3: return "PhantomRef"; |
|
1376 |
} |
|
1377 |
ShouldNotReachHere(); |
|
1378 |
return NULL; |
|
1379 |
} |
|
1380 |
||
1381 |
#ifndef PRODUCT |
|
1382 |
void ReferenceProcessor::verify_ok_to_handle_reflists() { |
|
1383 |
// empty for now |
|
1384 |
} |
|
1385 |
#endif |
|
1386 |
||
1387 |
#ifndef PRODUCT |
|
1388 |
void ReferenceProcessor::clear_discovered_references() { |
|
1389 |
guarantee(!_discovering_refs, "Discovering refs?"); |
|
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
1390 |
for (uint i = 0; i < _max_num_q * number_of_subclasses_of_ref(); i++) { |
10747
dfdb9eb56e49
7095243: Disambiguate ReferenceProcessor::_discoveredSoftRefs
johnc
parents:
10683
diff
changeset
|
1391 |
clear_discovered_references(_discovered_refs[i]); |
1 | 1392 |
} |
1393 |
} |
|
10524
6594ca81279a
7085906: Replace the permgen allocated sentinelRef with a self-looped end
stefank
parents:
8688
diff
changeset
|
1394 |
|
1 | 1395 |
#endif // PRODUCT |