author | tschatzl |
Mon, 21 Jul 2014 10:00:31 +0200 | |
changeset 25730 | 7eb4e685f739 |
parent 25492 | d27050bdfb04 |
child 26183 | bbe259d3c8bc |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2000, 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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||
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#include "precompiled.hpp" |
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#include "classfile/symbolTable.hpp" |
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#include "classfile/systemDictionary.hpp" |
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#include "classfile/vmSymbols.hpp" |
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#include "code/icBuffer.hpp" |
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#include "gc_implementation/shared/collectorCounters.hpp" |
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#include "gc_implementation/shared/gcTrace.hpp" |
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#include "gc_implementation/shared/gcTraceTime.hpp" |
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#include "gc_implementation/shared/vmGCOperations.hpp" |
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#include "gc_interface/collectedHeap.inline.hpp" |
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#include "memory/filemap.hpp" |
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#include "memory/gcLocker.inline.hpp" |
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#include "memory/genCollectedHeap.hpp" |
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#include "memory/genOopClosures.inline.hpp" |
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#include "memory/generation.inline.hpp" |
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#include "memory/generationSpec.hpp" |
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#include "memory/resourceArea.hpp" |
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#include "memory/sharedHeap.hpp" |
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#include "memory/space.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "oops/oop.inline2.hpp" |
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#include "runtime/biasedLocking.hpp" |
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#include "runtime/fprofiler.hpp" |
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#include "runtime/handles.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/java.hpp" |
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#include "runtime/vmThread.hpp" |
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#include "services/memoryService.hpp" |
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#include "utilities/vmError.hpp" |
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#include "utilities/workgroup.hpp" |
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#include "utilities/macros.hpp" |
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#if INCLUDE_ALL_GCS |
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#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
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#include "gc_implementation/concurrentMarkSweep/vmCMSOperations.hpp" |
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#endif // INCLUDE_ALL_GCS |
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GenCollectedHeap* GenCollectedHeap::_gch; |
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NOT_PRODUCT(size_t GenCollectedHeap::_skip_header_HeapWords = 0;) |
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// The set of potentially parallel tasks in root scanning. |
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enum GCH_strong_roots_tasks { |
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// We probably want to parallelize both of these internally, but for now... |
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GCH_PS_younger_gens, |
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// Leave this one last. |
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GCH_PS_NumElements |
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}; |
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GenCollectedHeap::GenCollectedHeap(GenCollectorPolicy *policy) : |
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SharedHeap(policy), |
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_gen_policy(policy), |
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_gen_process_roots_tasks(new SubTasksDone(GCH_PS_NumElements)), |
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_full_collections_completed(0) |
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{ |
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if (_gen_process_roots_tasks == NULL || |
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!_gen_process_roots_tasks->valid()) { |
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vm_exit_during_initialization("Failed necessary allocation."); |
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} |
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assert(policy != NULL, "Sanity check"); |
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} |
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jint GenCollectedHeap::initialize() { |
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CollectedHeap::pre_initialize(); |
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int i; |
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_n_gens = gen_policy()->number_of_generations(); |
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// While there are no constraints in the GC code that HeapWordSize |
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// be any particular value, there are multiple other areas in the |
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// system which believe this to be true (e.g. oop->object_size in some |
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// cases incorrectly returns the size in wordSize units rather than |
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// HeapWordSize). |
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guarantee(HeapWordSize == wordSize, "HeapWordSize must equal wordSize"); |
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// The heap must be at least as aligned as generations. |
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size_t gen_alignment = Generation::GenGrain; |
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_gen_specs = gen_policy()->generations(); |
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// Make sure the sizes are all aligned. |
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for (i = 0; i < _n_gens; i++) { |
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_gen_specs[i]->align(gen_alignment); |
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} |
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// Allocate space for the heap. |
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char* heap_address; |
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size_t total_reserved = 0; |
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int n_covered_regions = 0; |
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ReservedSpace heap_rs; |
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size_t heap_alignment = collector_policy()->heap_alignment(); |
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heap_address = allocate(heap_alignment, &total_reserved, |
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&n_covered_regions, &heap_rs); |
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if (!heap_rs.is_reserved()) { |
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vm_shutdown_during_initialization( |
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"Could not reserve enough space for object heap"); |
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return JNI_ENOMEM; |
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} |
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_reserved = MemRegion((HeapWord*)heap_rs.base(), |
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(HeapWord*)(heap_rs.base() + heap_rs.size())); |
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// It is important to do this in a way such that concurrent readers can't |
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// temporarily think something is in the heap. (Seen this happen in asserts.) |
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_reserved.set_word_size(0); |
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_reserved.set_start((HeapWord*)heap_rs.base()); |
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size_t actual_heap_size = heap_rs.size(); |
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_reserved.set_end((HeapWord*)(heap_rs.base() + actual_heap_size)); |
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_rem_set = collector_policy()->create_rem_set(_reserved, n_covered_regions); |
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set_barrier_set(rem_set()->bs()); |
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_gch = this; |
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for (i = 0; i < _n_gens; i++) { |
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ReservedSpace this_rs = heap_rs.first_part(_gen_specs[i]->max_size(), false, false); |
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_gens[i] = _gen_specs[i]->init(this_rs, i, rem_set()); |
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heap_rs = heap_rs.last_part(_gen_specs[i]->max_size()); |
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} |
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clear_incremental_collection_failed(); |
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#if INCLUDE_ALL_GCS |
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// If we are running CMS, create the collector responsible |
150 |
// for collecting the CMS generations. |
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151 |
if (collector_policy()->is_concurrent_mark_sweep_policy()) { |
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bool success = create_cms_collector(); |
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if (!success) return JNI_ENOMEM; |
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} |
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#endif // INCLUDE_ALL_GCS |
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return JNI_OK; |
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} |
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char* GenCollectedHeap::allocate(size_t alignment, |
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162 |
size_t* _total_reserved, |
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int* _n_covered_regions, |
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ReservedSpace* heap_rs){ |
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const char overflow_msg[] = "The size of the object heap + VM data exceeds " |
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"the maximum representable size"; |
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// Now figure out the total size. |
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169 |
size_t total_reserved = 0; |
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int n_covered_regions = 0; |
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const size_t pageSize = UseLargePages ? |
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os::large_page_size() : os::vm_page_size(); |
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assert(alignment % pageSize == 0, "Must be"); |
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for (int i = 0; i < _n_gens; i++) { |
177 |
total_reserved += _gen_specs[i]->max_size(); |
|
178 |
if (total_reserved < _gen_specs[i]->max_size()) { |
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vm_exit_during_initialization(overflow_msg); |
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} |
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n_covered_regions += _gen_specs[i]->n_covered_regions(); |
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} |
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assert(total_reserved % alignment == 0, |
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err_msg("Gen size; total_reserved=" SIZE_FORMAT ", alignment=" |
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SIZE_FORMAT, total_reserved, alignment)); |
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// Needed until the cardtable is fixed to have the right number |
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// of covered regions. |
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n_covered_regions += 2; |
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*_total_reserved = total_reserved; |
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*_n_covered_regions = n_covered_regions; |
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*heap_rs = Universe::reserve_heap(total_reserved, alignment); |
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return heap_rs->base(); |
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} |
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void GenCollectedHeap::post_initialize() { |
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SharedHeap::post_initialize(); |
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GenCollectorPolicy *policy = (GenCollectorPolicy *)collector_policy(); |
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guarantee(policy->is_generation_policy(), "Illegal policy type"); |
1 | 203 |
DefNewGeneration* def_new_gen = (DefNewGeneration*) get_gen(0); |
204 |
assert(def_new_gen->kind() == Generation::DefNew || |
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def_new_gen->kind() == Generation::ParNew, |
1 | 206 |
"Wrong generation kind"); |
207 |
||
208 |
Generation* old_gen = get_gen(1); |
|
209 |
assert(old_gen->kind() == Generation::ConcurrentMarkSweep || |
|
210 |
old_gen->kind() == Generation::MarkSweepCompact, |
|
211 |
"Wrong generation kind"); |
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212 |
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213 |
policy->initialize_size_policy(def_new_gen->eden()->capacity(), |
|
214 |
old_gen->capacity(), |
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def_new_gen->from()->capacity()); |
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216 |
policy->initialize_gc_policy_counters(); |
|
217 |
} |
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218 |
||
219 |
void GenCollectedHeap::ref_processing_init() { |
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220 |
SharedHeap::ref_processing_init(); |
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221 |
for (int i = 0; i < _n_gens; i++) { |
|
222 |
_gens[i]->ref_processor_init(); |
|
223 |
} |
|
224 |
} |
|
225 |
||
226 |
size_t GenCollectedHeap::capacity() const { |
|
227 |
size_t res = 0; |
|
228 |
for (int i = 0; i < _n_gens; i++) { |
|
229 |
res += _gens[i]->capacity(); |
|
230 |
} |
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231 |
return res; |
|
232 |
} |
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233 |
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234 |
size_t GenCollectedHeap::used() const { |
|
235 |
size_t res = 0; |
|
236 |
for (int i = 0; i < _n_gens; i++) { |
|
237 |
res += _gens[i]->used(); |
|
238 |
} |
|
239 |
return res; |
|
240 |
} |
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// Save the "used_region" for generations level and lower. |
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void GenCollectedHeap::save_used_regions(int level) { |
1 | 244 |
assert(level < _n_gens, "Illegal level parameter"); |
245 |
for (int i = level; i >= 0; i--) { |
|
246 |
_gens[i]->save_used_region(); |
|
247 |
} |
|
248 |
} |
|
249 |
||
250 |
size_t GenCollectedHeap::max_capacity() const { |
|
251 |
size_t res = 0; |
|
252 |
for (int i = 0; i < _n_gens; i++) { |
|
253 |
res += _gens[i]->max_capacity(); |
|
254 |
} |
|
255 |
return res; |
|
256 |
} |
|
257 |
||
258 |
// Update the _full_collections_completed counter |
|
259 |
// at the end of a stop-world full GC. |
|
260 |
unsigned int GenCollectedHeap::update_full_collections_completed() { |
|
261 |
MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
262 |
assert(_full_collections_completed <= _total_full_collections, |
|
263 |
"Can't complete more collections than were started"); |
|
264 |
_full_collections_completed = _total_full_collections; |
|
265 |
ml.notify_all(); |
|
266 |
return _full_collections_completed; |
|
267 |
} |
|
268 |
||
269 |
// Update the _full_collections_completed counter, as appropriate, |
|
270 |
// at the end of a concurrent GC cycle. Note the conditional update |
|
271 |
// below to allow this method to be called by a concurrent collector |
|
272 |
// without synchronizing in any manner with the VM thread (which |
|
273 |
// may already have initiated a STW full collection "concurrently"). |
|
274 |
unsigned int GenCollectedHeap::update_full_collections_completed(unsigned int count) { |
|
275 |
MonitorLockerEx ml(FullGCCount_lock, Mutex::_no_safepoint_check_flag); |
|
276 |
assert((_full_collections_completed <= _total_full_collections) && |
|
277 |
(count <= _total_full_collections), |
|
278 |
"Can't complete more collections than were started"); |
|
279 |
if (count > _full_collections_completed) { |
|
280 |
_full_collections_completed = count; |
|
281 |
ml.notify_all(); |
|
282 |
} |
|
283 |
return _full_collections_completed; |
|
284 |
} |
|
285 |
||
286 |
||
287 |
#ifndef PRODUCT |
|
288 |
// Override of memory state checking method in CollectedHeap: |
|
289 |
// Some collectors (CMS for example) can't have badHeapWordVal written |
|
290 |
// in the first two words of an object. (For instance , in the case of |
|
291 |
// CMS these words hold state used to synchronize between certain |
|
292 |
// (concurrent) GC steps and direct allocating mutators.) |
|
293 |
// The skip_header_HeapWords() method below, allows us to skip |
|
294 |
// over the requisite number of HeapWord's. Note that (for |
|
295 |
// generational collectors) this means that those many words are |
|
296 |
// skipped in each object, irrespective of the generation in which |
|
297 |
// that object lives. The resultant loss of precision seems to be |
|
298 |
// harmless and the pain of avoiding that imprecision appears somewhat |
|
299 |
// higher than we are prepared to pay for such rudimentary debugging |
|
300 |
// support. |
|
301 |
void GenCollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, |
|
302 |
size_t size) { |
|
303 |
if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
|
304 |
// We are asked to check a size in HeapWords, |
|
305 |
// but the memory is mangled in juint words. |
|
306 |
juint* start = (juint*) (addr + skip_header_HeapWords()); |
|
307 |
juint* end = (juint*) (addr + size); |
|
308 |
for (juint* slot = start; slot < end; slot += 1) { |
|
309 |
assert(*slot == badHeapWordVal, |
|
310 |
"Found non badHeapWordValue in pre-allocation check"); |
|
311 |
} |
|
312 |
} |
|
313 |
} |
|
314 |
#endif |
|
315 |
||
316 |
HeapWord* GenCollectedHeap::attempt_allocation(size_t size, |
|
317 |
bool is_tlab, |
|
318 |
bool first_only) { |
|
319 |
HeapWord* res; |
|
320 |
for (int i = 0; i < _n_gens; i++) { |
|
321 |
if (_gens[i]->should_allocate(size, is_tlab)) { |
|
322 |
res = _gens[i]->allocate(size, is_tlab); |
|
323 |
if (res != NULL) return res; |
|
324 |
else if (first_only) break; |
|
325 |
} |
|
326 |
} |
|
327 |
// Otherwise... |
|
328 |
return NULL; |
|
329 |
} |
|
330 |
||
331 |
HeapWord* GenCollectedHeap::mem_allocate(size_t size, |
|
332 |
bool* gc_overhead_limit_was_exceeded) { |
|
333 |
return collector_policy()->mem_allocate_work(size, |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
334 |
false /* is_tlab */, |
1 | 335 |
gc_overhead_limit_was_exceeded); |
336 |
} |
|
337 |
||
338 |
bool GenCollectedHeap::must_clear_all_soft_refs() { |
|
339 |
return _gc_cause == GCCause::_last_ditch_collection; |
|
340 |
} |
|
341 |
||
342 |
bool GenCollectedHeap::should_do_concurrent_full_gc(GCCause::Cause cause) { |
|
5433
c182d4c3039e
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
5343
diff
changeset
|
343 |
return UseConcMarkSweepGC && |
c182d4c3039e
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
5343
diff
changeset
|
344 |
((cause == GCCause::_gc_locker && GCLockerInvokesConcurrent) || |
c182d4c3039e
6919638: CMS: ExplicitGCInvokesConcurrent misinteracts with gc locker
ysr
parents:
5343
diff
changeset
|
345 |
(cause == GCCause::_java_lang_system_gc && ExplicitGCInvokesConcurrent)); |
1 | 346 |
} |
347 |
||
348 |
void GenCollectedHeap::do_collection(bool full, |
|
349 |
bool clear_all_soft_refs, |
|
350 |
size_t size, |
|
351 |
bool is_tlab, |
|
352 |
int max_level) { |
|
353 |
bool prepared_for_verification = false; |
|
354 |
ResourceMark rm; |
|
355 |
DEBUG_ONLY(Thread* my_thread = Thread::current();) |
|
356 |
||
357 |
assert(SafepointSynchronize::is_at_safepoint(), "should be at safepoint"); |
|
358 |
assert(my_thread->is_VM_thread() || |
|
359 |
my_thread->is_ConcurrentGC_thread(), |
|
360 |
"incorrect thread type capability"); |
|
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
361 |
assert(Heap_lock->is_locked(), |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
362 |
"the requesting thread should have the Heap_lock"); |
1 | 363 |
guarantee(!is_gc_active(), "collection is not reentrant"); |
364 |
assert(max_level < n_gens(), "sanity check"); |
|
365 |
||
366 |
if (GC_locker::check_active_before_gc()) { |
|
367 |
return; // GC is disabled (e.g. JNI GetXXXCritical operation) |
|
368 |
} |
|
369 |
||
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
370 |
const bool do_clear_all_soft_refs = clear_all_soft_refs || |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
371 |
collector_policy()->should_clear_all_soft_refs(); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
372 |
|
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
373 |
ClearedAllSoftRefs casr(do_clear_all_soft_refs, collector_policy()); |
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
374 |
|
23854
50f7f89b34e0
8038934: Remove prefix allocated_ from methods and variables in Metaspace
ehelin
parents:
23508
diff
changeset
|
375 |
const size_t metadata_prev_used = MetaspaceAux::used_bytes(); |
1 | 376 |
|
11636
3c07b54482a5
7141200: log some interesting information in ring buffers for crashes
never
parents:
11396
diff
changeset
|
377 |
print_heap_before_gc(); |
1 | 378 |
|
379 |
{ |
|
380 |
FlagSetting fl(_is_gc_active, true); |
|
381 |
||
382 |
bool complete = full && (max_level == (n_gens()-1)); |
|
12630
ddf6ee008138
7166894: Add gc cause to GC logging for all collectors
brutisso
parents:
12379
diff
changeset
|
383 |
const char* gc_cause_prefix = complete ? "Full GC" : "GC"; |
1 | 384 |
gclog_or_tty->date_stamp(PrintGC && PrintGCDateStamps); |
385 |
TraceCPUTime tcpu(PrintGCDetails, true, gclog_or_tty); |
|
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
386 |
// The PrintGCDetails logging starts before we have incremented the GC id. We will do that later |
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
387 |
// so we can assume here that the next GC id is what we want. |
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
388 |
GCTraceTime t(GCCauseString(gc_cause_prefix, gc_cause()), PrintGCDetails, false, NULL, GCId::peek()); |
1 | 389 |
|
390 |
gc_prologue(complete); |
|
391 |
increment_total_collections(complete); |
|
392 |
||
393 |
size_t gch_prev_used = used(); |
|
394 |
||
395 |
int starting_level = 0; |
|
396 |
if (full) { |
|
397 |
// Search for the oldest generation which will collect all younger |
|
398 |
// generations, and start collection loop there. |
|
399 |
for (int i = max_level; i >= 0; i--) { |
|
400 |
if (_gens[i]->full_collects_younger_generations()) { |
|
401 |
starting_level = i; |
|
402 |
break; |
|
403 |
} |
|
404 |
} |
|
405 |
} |
|
406 |
||
407 |
bool must_restore_marks_for_biased_locking = false; |
|
408 |
||
409 |
int max_level_collected = starting_level; |
|
410 |
for (int i = starting_level; i <= max_level; i++) { |
|
411 |
if (_gens[i]->should_collect(full, size, is_tlab)) { |
|
3580
55775b48f5e5
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
1610
diff
changeset
|
412 |
if (i == n_gens() - 1) { // a major collection is to happen |
55775b48f5e5
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
1610
diff
changeset
|
413 |
if (!complete) { |
55775b48f5e5
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
1610
diff
changeset
|
414 |
// The full_collections increment was missed above. |
55775b48f5e5
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
1610
diff
changeset
|
415 |
increment_total_full_collections(); |
55775b48f5e5
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
1610
diff
changeset
|
416 |
} |
18025 | 417 |
pre_full_gc_dump(NULL); // do any pre full gc dumps |
3580
55775b48f5e5
6862295: JDWP threadid changes during debugging session (leading to ingored breakpoints)
dcubed
parents:
1610
diff
changeset
|
418 |
} |
1 | 419 |
// Timer for individual generations. Last argument is false: no CR |
18025 | 420 |
// FIXME: We should try to start the timing earlier to cover more of the GC pause |
25350
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
421 |
// The PrintGCDetails logging starts before we have incremented the GC id. We will do that later |
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
422 |
// so we can assume here that the next GC id is what we want. |
6423a57e5451
8043607: Add a GC id as a log decoration similar to PrintGCTimeStamps
brutisso
parents:
24941
diff
changeset
|
423 |
GCTraceTime t1(_gens[i]->short_name(), PrintGCDetails, false, NULL, GCId::peek()); |
1 | 424 |
TraceCollectorStats tcs(_gens[i]->counters()); |
9623
151c0b638488
7036199: Adding a notification to the implementation of GarbageCollectorMXBeans
fparain
parents:
8921
diff
changeset
|
425 |
TraceMemoryManagerStats tmms(_gens[i]->kind(),gc_cause()); |
1 | 426 |
|
427 |
size_t prev_used = _gens[i]->used(); |
|
428 |
_gens[i]->stat_record()->invocations++; |
|
429 |
_gens[i]->stat_record()->accumulated_time.start(); |
|
430 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
431 |
// Must be done anew before each collection because |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
432 |
// a previous collection will do mangling and will |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
433 |
// change top of some spaces. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
434 |
record_gen_tops_before_GC(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
435 |
|
1 | 436 |
if (PrintGC && Verbose) { |
437 |
gclog_or_tty->print("level=%d invoke=%d size=" SIZE_FORMAT, |
|
438 |
i, |
|
439 |
_gens[i]->stat_record()->invocations, |
|
440 |
size*HeapWordSize); |
|
441 |
} |
|
442 |
||
443 |
if (VerifyBeforeGC && i >= VerifyGCLevel && |
|
444 |
total_collections() >= VerifyGCStartAt) { |
|
445 |
HandleMark hm; // Discard invalid handles created during verification |
|
446 |
if (!prepared_for_verification) { |
|
447 |
prepare_for_verify(); |
|
448 |
prepared_for_verification = true; |
|
449 |
} |
|
17112
e49af4ba7755
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
17109
diff
changeset
|
450 |
Universe::verify(" VerifyBeforeGC:"); |
1 | 451 |
} |
452 |
COMPILER2_PRESENT(DerivedPointerTable::clear()); |
|
453 |
||
454 |
if (!must_restore_marks_for_biased_locking && |
|
455 |
_gens[i]->performs_in_place_marking()) { |
|
456 |
// We perform this mark word preservation work lazily |
|
457 |
// because it's only at this point that we know whether we |
|
458 |
// absolutely have to do it; we want to avoid doing it for |
|
459 |
// scavenge-only collections where it's unnecessary |
|
460 |
must_restore_marks_for_biased_locking = true; |
|
461 |
BiasedLocking::preserve_marks(); |
|
462 |
} |
|
463 |
||
464 |
// Do collection work |
|
465 |
{ |
|
466 |
// Note on ref discovery: For what appear to be historical reasons, |
|
467 |
// GCH enables and disabled (by enqueing) refs discovery. |
|
468 |
// In the future this should be moved into the generation's |
|
469 |
// collect method so that ref discovery and enqueueing concerns |
|
470 |
// are local to a generation. The collect method could return |
|
471 |
// an appropriate indication in the case that notification on |
|
472 |
// the ref lock was needed. This will make the treatment of |
|
473 |
// weak refs more uniform (and indeed remove such concerns |
|
474 |
// from GCH). XXX |
|
475 |
||
476 |
HandleMark hm; // Discard invalid handles created during gc |
|
477 |
save_marks(); // save marks for all gens |
|
478 |
// We want to discover references, but not process them yet. |
|
479 |
// This mode is disabled in process_discovered_references if the |
|
480 |
// generation does some collection work, or in |
|
481 |
// enqueue_discovered_references if the generation returns |
|
482 |
// without doing any work. |
|
483 |
ReferenceProcessor* rp = _gens[i]->ref_processor(); |
|
484 |
// If the discovery of ("weak") refs in this generation is |
|
485 |
// atomic wrt other collectors in this configuration, we |
|
486 |
// are guaranteed to have empty discovered ref lists. |
|
487 |
if (rp->discovery_is_atomic()) { |
|
10670
4ea0e7d2ffbc
6484982: G1: process references during evacuation pauses
johnc
parents:
10524
diff
changeset
|
488 |
rp->enable_discovery(true /*verify_disabled*/, true /*verify_no_refs*/); |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
489 |
rp->setup_policy(do_clear_all_soft_refs); |
1 | 490 |
} else { |
1606
dcf9714addbe
6684579: SoftReference processing can be made more efficient
ysr
parents:
977
diff
changeset
|
491 |
// collect() below will enable discovery as appropriate |
1 | 492 |
} |
5343
95a5c4b89273
6858496: Clear all SoftReferences before an out-of-memory due to GC overhead limit.
jmasa
parents:
4641
diff
changeset
|
493 |
_gens[i]->collect(full, do_clear_all_soft_refs, size, is_tlab); |
1 | 494 |
if (!rp->enqueuing_is_done()) { |
495 |
rp->enqueue_discovered_references(); |
|
496 |
} else { |
|
497 |
rp->set_enqueuing_is_done(false); |
|
498 |
} |
|
499 |
rp->verify_no_references_recorded(); |
|
500 |
} |
|
501 |
max_level_collected = i; |
|
502 |
||
503 |
// Determine if allocation request was met. |
|
504 |
if (size > 0) { |
|
505 |
if (!is_tlab || _gens[i]->supports_tlab_allocation()) { |
|
506 |
if (size*HeapWordSize <= _gens[i]->unsafe_max_alloc_nogc()) { |
|
507 |
size = 0; |
|
508 |
} |
|
509 |
} |
|
510 |
} |
|
511 |
||
512 |
COMPILER2_PRESENT(DerivedPointerTable::update_pointers()); |
|
513 |
||
514 |
_gens[i]->stat_record()->accumulated_time.stop(); |
|
515 |
||
516 |
update_gc_stats(i, full); |
|
517 |
||
518 |
if (VerifyAfterGC && i >= VerifyGCLevel && |
|
519 |
total_collections() >= VerifyGCStartAt) { |
|
520 |
HandleMark hm; // Discard invalid handles created during verification |
|
17112
e49af4ba7755
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
17109
diff
changeset
|
521 |
Universe::verify(" VerifyAfterGC:"); |
1 | 522 |
} |
523 |
||
524 |
if (PrintGCDetails) { |
|
525 |
gclog_or_tty->print(":"); |
|
526 |
_gens[i]->print_heap_change(prev_used); |
|
527 |
} |
|
528 |
} |
|
529 |
} |
|
530 |
||
531 |
// Update "complete" boolean wrt what actually transpired -- |
|
532 |
// for instance, a promotion failure could have led to |
|
533 |
// a whole heap collection. |
|
534 |
complete = complete || (max_level_collected == n_gens() - 1); |
|
535 |
||
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
2010
diff
changeset
|
536 |
if (complete) { // We did a "major" collection |
18025 | 537 |
// FIXME: See comment at pre_full_gc_dump call |
538 |
post_full_gc_dump(NULL); // do any post full gc dumps |
|
2141
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
2010
diff
changeset
|
539 |
} |
e9a644aaff87
6797870: Add -XX:+{HeapDump,PrintClassHistogram}{Before,After}FullGC
ysr
parents:
2010
diff
changeset
|
540 |
|
1 | 541 |
if (PrintGCDetails) { |
542 |
print_heap_change(gch_prev_used); |
|
543 |
||
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
544 |
// Print metaspace info for full GC with PrintGCDetails flag. |
1 | 545 |
if (complete) { |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
546 |
MetaspaceAux::print_metaspace_change(metadata_prev_used); |
1 | 547 |
} |
548 |
} |
|
549 |
||
550 |
for (int j = max_level_collected; j >= 0; j -= 1) { |
|
551 |
// Adjust generation sizes. |
|
552 |
_gens[j]->compute_new_size(); |
|
553 |
} |
|
554 |
||
555 |
if (complete) { |
|
16385
4a05c6d94b04
8005602: NPG: classunloading does not happen while CMS GC with -XX:+CMSClassUnloadingEnabled is used
mgerdin
parents:
15482
diff
changeset
|
556 |
// Delete metaspaces for unloaded class loaders and clean up loader_data graph |
4a05c6d94b04
8005602: NPG: classunloading does not happen while CMS GC with -XX:+CMSClassUnloadingEnabled is used
mgerdin
parents:
15482
diff
changeset
|
557 |
ClassLoaderDataGraph::purge(); |
17109
90e6c31bbbe4
8008966: NPG: Inefficient Metaspace counter functions cause large young GC regressions
jmasa
parents:
17105
diff
changeset
|
558 |
MetaspaceAux::verify_metrics(); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
559 |
// Resize the metaspace capacity after full collections |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
560 |
MetaspaceGC::compute_new_size(); |
1 | 561 |
update_full_collections_completed(); |
562 |
} |
|
563 |
||
564 |
// Track memory usage and detect low memory after GC finishes |
|
565 |
MemoryService::track_memory_usage(); |
|
566 |
||
567 |
gc_epilogue(complete); |
|
568 |
||
569 |
if (must_restore_marks_for_biased_locking) { |
|
570 |
BiasedLocking::restore_marks(); |
|
571 |
} |
|
572 |
} |
|
573 |
||
11636
3c07b54482a5
7141200: log some interesting information in ring buffers for crashes
never
parents:
11396
diff
changeset
|
574 |
print_heap_after_gc(); |
1 | 575 |
|
2010
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1893
diff
changeset
|
576 |
#ifdef TRACESPINNING |
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1893
diff
changeset
|
577 |
ParallelTaskTerminator::print_termination_counts(); |
c13462bbad17
6690928: Use spinning in combination with yields for workstealing termination.
jmasa
parents:
1893
diff
changeset
|
578 |
#endif |
1 | 579 |
} |
580 |
||
581 |
HeapWord* GenCollectedHeap::satisfy_failed_allocation(size_t size, bool is_tlab) { |
|
582 |
return collector_policy()->satisfy_failed_allocation(size, is_tlab); |
|
583 |
} |
|
584 |
||
11396
917d8673b5ef
7121618: Change type of number of GC workers to unsigned int.
jmasa
parents:
11251
diff
changeset
|
585 |
void GenCollectedHeap::set_par_threads(uint t) { |
1 | 586 |
SharedHeap::set_par_threads(t); |
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
587 |
_gen_process_roots_tasks->set_n_threads(t); |
1 | 588 |
} |
589 |
||
590 |
void GenCollectedHeap:: |
|
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
591 |
gen_process_roots(int level, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
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changeset
|
592 |
bool younger_gens_as_roots, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
25491
diff
changeset
|
593 |
bool activate_scope, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
25491
diff
changeset
|
594 |
SharedHeap::ScanningOption so, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
595 |
OopsInGenClosure* not_older_gens, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
596 |
OopsInGenClosure* weak_roots, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
597 |
OopsInGenClosure* older_gens, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
598 |
CLDClosure* cld_closure, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
599 |
CLDClosure* weak_cld_closure, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
25491
diff
changeset
|
600 |
CodeBlobClosure* code_closure) { |
3908
24b55ad4c228
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
3581
diff
changeset
|
601 |
|
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
602 |
// General roots. |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
25491
diff
changeset
|
603 |
SharedHeap::process_roots(activate_scope, so, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
604 |
not_older_gens, weak_roots, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
605 |
cld_closure, weak_cld_closure, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
606 |
code_closure); |
1 | 607 |
|
608 |
if (younger_gens_as_roots) { |
|
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
609 |
if (!_gen_process_roots_tasks->is_task_claimed(GCH_PS_younger_gens)) { |
1 | 610 |
for (int i = 0; i < level; i++) { |
611 |
not_older_gens->set_generation(_gens[i]); |
|
612 |
_gens[i]->oop_iterate(not_older_gens); |
|
613 |
} |
|
614 |
not_older_gens->reset_generation(); |
|
615 |
} |
|
616 |
} |
|
617 |
// When collection is parallel, all threads get to cooperate to do |
|
618 |
// older-gen scanning. |
|
619 |
for (int i = level+1; i < _n_gens; i++) { |
|
620 |
older_gens->set_generation(_gens[i]); |
|
621 |
rem_set()->younger_refs_iterate(_gens[i], older_gens); |
|
622 |
older_gens->reset_generation(); |
|
623 |
} |
|
624 |
||
25492
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
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parents:
25491
diff
changeset
|
625 |
_gen_process_roots_tasks->all_tasks_completed(); |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
626 |
} |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
627 |
|
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
628 |
void GenCollectedHeap:: |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
629 |
gen_process_roots(int level, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
630 |
bool younger_gens_as_roots, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
631 |
bool activate_scope, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
632 |
SharedHeap::ScanningOption so, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
633 |
bool only_strong_roots, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
634 |
OopsInGenClosure* not_older_gens, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
635 |
OopsInGenClosure* older_gens, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
636 |
CLDClosure* cld_closure) { |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
637 |
|
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
638 |
const bool is_adjust_phase = !only_strong_roots && !younger_gens_as_roots; |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
639 |
|
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
640 |
bool is_moving_collection = false; |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
641 |
if (level == 0 || is_adjust_phase) { |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
642 |
// young collections are always moving |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
643 |
is_moving_collection = true; |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
644 |
} |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
645 |
|
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
646 |
MarkingCodeBlobClosure mark_code_closure(not_older_gens, is_moving_collection); |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
647 |
CodeBlobClosure* code_closure = &mark_code_closure; |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
648 |
|
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
649 |
gen_process_roots(level, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
650 |
younger_gens_as_roots, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
651 |
activate_scope, so, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
652 |
not_older_gens, only_strong_roots ? NULL : not_older_gens, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
653 |
older_gens, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
654 |
cld_closure, only_strong_roots ? NULL : cld_closure, |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
655 |
code_closure); |
d27050bdfb04
8049421: G1 Class Unloading after completing a concurrent mark cycle
stefank
parents:
25491
diff
changeset
|
656 |
|
1 | 657 |
} |
658 |
||
22882
195c8f70d605
8034761: Remove the do_code_roots parameter from process_strong_roots
stefank
parents:
22552
diff
changeset
|
659 |
void GenCollectedHeap::gen_process_weak_roots(OopClosure* root_closure) { |
195c8f70d605
8034761: Remove the do_code_roots parameter from process_strong_roots
stefank
parents:
22552
diff
changeset
|
660 |
SharedHeap::process_weak_roots(root_closure); |
1 | 661 |
// "Local" "weak" refs |
662 |
for (int i = 0; i < _n_gens; i++) { |
|
663 |
_gens[i]->ref_processor()->weak_oops_do(root_closure); |
|
664 |
} |
|
665 |
} |
|
666 |
||
667 |
#define GCH_SINCE_SAVE_MARKS_ITERATE_DEFN(OopClosureType, nv_suffix) \ |
|
668 |
void GenCollectedHeap:: \ |
|
669 |
oop_since_save_marks_iterate(int level, \ |
|
670 |
OopClosureType* cur, \ |
|
671 |
OopClosureType* older) { \ |
|
672 |
_gens[level]->oop_since_save_marks_iterate##nv_suffix(cur); \ |
|
673 |
for (int i = level+1; i < n_gens(); i++) { \ |
|
674 |
_gens[i]->oop_since_save_marks_iterate##nv_suffix(older); \ |
|
675 |
} \ |
|
676 |
} |
|
677 |
||
678 |
ALL_SINCE_SAVE_MARKS_CLOSURES(GCH_SINCE_SAVE_MARKS_ITERATE_DEFN) |
|
679 |
||
680 |
#undef GCH_SINCE_SAVE_MARKS_ITERATE_DEFN |
|
681 |
||
682 |
bool GenCollectedHeap::no_allocs_since_save_marks(int level) { |
|
683 |
for (int i = level; i < _n_gens; i++) { |
|
684 |
if (!_gens[i]->no_allocs_since_save_marks()) return false; |
|
685 |
} |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
686 |
return true; |
1 | 687 |
} |
688 |
||
689 |
bool GenCollectedHeap::supports_inline_contig_alloc() const { |
|
690 |
return _gens[0]->supports_inline_contig_alloc(); |
|
691 |
} |
|
692 |
||
693 |
HeapWord** GenCollectedHeap::top_addr() const { |
|
694 |
return _gens[0]->top_addr(); |
|
695 |
} |
|
696 |
||
697 |
HeapWord** GenCollectedHeap::end_addr() const { |
|
698 |
return _gens[0]->end_addr(); |
|
699 |
} |
|
700 |
||
701 |
// public collection interfaces |
|
702 |
||
703 |
void GenCollectedHeap::collect(GCCause::Cause cause) { |
|
704 |
if (should_do_concurrent_full_gc(cause)) { |
|
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
705 |
#if INCLUDE_ALL_GCS |
1 | 706 |
// mostly concurrent full collection |
707 |
collect_mostly_concurrent(cause); |
|
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
708 |
#else // INCLUDE_ALL_GCS |
1 | 709 |
ShouldNotReachHere(); |
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
710 |
#endif // INCLUDE_ALL_GCS |
1 | 711 |
} else { |
712 |
#ifdef ASSERT |
|
713 |
if (cause == GCCause::_scavenge_alot) { |
|
714 |
// minor collection only |
|
715 |
collect(cause, 0); |
|
716 |
} else { |
|
717 |
// Stop-the-world full collection |
|
718 |
collect(cause, n_gens() - 1); |
|
719 |
} |
|
720 |
#else |
|
721 |
// Stop-the-world full collection |
|
722 |
collect(cause, n_gens() - 1); |
|
723 |
#endif |
|
724 |
} |
|
725 |
} |
|
726 |
||
727 |
void GenCollectedHeap::collect(GCCause::Cause cause, int max_level) { |
|
728 |
// The caller doesn't have the Heap_lock |
|
729 |
assert(!Heap_lock->owned_by_self(), "this thread should not own the Heap_lock"); |
|
730 |
MutexLocker ml(Heap_lock); |
|
731 |
collect_locked(cause, max_level); |
|
732 |
} |
|
733 |
||
734 |
void GenCollectedHeap::collect_locked(GCCause::Cause cause) { |
|
735 |
// The caller has the Heap_lock |
|
736 |
assert(Heap_lock->owned_by_self(), "this thread should own the Heap_lock"); |
|
737 |
collect_locked(cause, n_gens() - 1); |
|
738 |
} |
|
739 |
||
740 |
// this is the private collection interface |
|
741 |
// The Heap_lock is expected to be held on entry. |
|
742 |
||
743 |
void GenCollectedHeap::collect_locked(GCCause::Cause cause, int max_level) { |
|
744 |
// Read the GC count while holding the Heap_lock |
|
745 |
unsigned int gc_count_before = total_collections(); |
|
746 |
unsigned int full_gc_count_before = total_full_collections(); |
|
747 |
{ |
|
748 |
MutexUnlocker mu(Heap_lock); // give up heap lock, execute gets it back |
|
749 |
VM_GenCollectFull op(gc_count_before, full_gc_count_before, |
|
750 |
cause, max_level); |
|
751 |
VMThread::execute(&op); |
|
752 |
} |
|
753 |
} |
|
754 |
||
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
755 |
#if INCLUDE_ALL_GCS |
1 | 756 |
bool GenCollectedHeap::create_cms_collector() { |
757 |
||
25485
9c3d427eed01
8034246: remove CMS and ParNew adaptive size policy code
jcoomes
parents:
25350
diff
changeset
|
758 |
assert(_gens[1]->kind() == Generation::ConcurrentMarkSweep, |
1 | 759 |
"Unexpected generation kinds"); |
760 |
// Skip two header words in the block content verification |
|
761 |
NOT_PRODUCT(_skip_header_HeapWords = CMSCollector::skip_header_HeapWords();) |
|
762 |
CMSCollector* collector = new CMSCollector( |
|
763 |
(ConcurrentMarkSweepGeneration*)_gens[1], |
|
764 |
_rem_set->as_CardTableRS(), |
|
765 |
(ConcurrentMarkSweepPolicy*) collector_policy()); |
|
766 |
||
767 |
if (collector == NULL || !collector->completed_initialization()) { |
|
768 |
if (collector) { |
|
769 |
delete collector; // Be nice in embedded situation |
|
770 |
} |
|
771 |
vm_shutdown_during_initialization("Could not create CMS collector"); |
|
772 |
return false; |
|
773 |
} |
|
774 |
return true; // success |
|
775 |
} |
|
776 |
||
777 |
void GenCollectedHeap::collect_mostly_concurrent(GCCause::Cause cause) { |
|
778 |
assert(!Heap_lock->owned_by_self(), "Should not own Heap_lock"); |
|
779 |
||
780 |
MutexLocker ml(Heap_lock); |
|
781 |
// Read the GC counts while holding the Heap_lock |
|
782 |
unsigned int full_gc_count_before = total_full_collections(); |
|
783 |
unsigned int gc_count_before = total_collections(); |
|
784 |
{ |
|
785 |
MutexUnlocker mu(Heap_lock); |
|
786 |
VM_GenCollectFullConcurrent op(gc_count_before, full_gc_count_before, cause); |
|
787 |
VMThread::execute(&op); |
|
788 |
} |
|
789 |
} |
|
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
790 |
#endif // INCLUDE_ALL_GCS |
1 | 791 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
792 |
void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs) { |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
793 |
do_full_collection(clear_all_soft_refs, _n_gens - 1); |
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
794 |
} |
1 | 795 |
|
796 |
void GenCollectedHeap::do_full_collection(bool clear_all_soft_refs, |
|
797 |
int max_level) { |
|
798 |
int local_max_level; |
|
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
799 |
if (!incremental_collection_will_fail(false /* don't consult_young */) && |
1 | 800 |
gc_cause() == GCCause::_gc_locker) { |
801 |
local_max_level = 0; |
|
802 |
} else { |
|
803 |
local_max_level = max_level; |
|
804 |
} |
|
805 |
||
806 |
do_collection(true /* full */, |
|
807 |
clear_all_soft_refs /* clear_all_soft_refs */, |
|
808 |
0 /* size */, |
|
809 |
false /* is_tlab */, |
|
810 |
local_max_level /* max_level */); |
|
811 |
// Hack XXX FIX ME !!! |
|
812 |
// A scavenge may not have been attempted, or may have |
|
813 |
// been attempted and failed, because the old gen was too full |
|
814 |
if (local_max_level == 0 && gc_cause() == GCCause::_gc_locker && |
|
7419
263dd4e89b9d
7001033: assert(gch->gc_cause() == GCCause::_scavenge_alot || !gch->incremental_collection_failed())
ysr
parents:
7397
diff
changeset
|
815 |
incremental_collection_will_fail(false /* don't consult_young */)) { |
1 | 816 |
if (PrintGCDetails) { |
817 |
gclog_or_tty->print_cr("GC locker: Trying a full collection " |
|
818 |
"because scavenge failed"); |
|
819 |
} |
|
820 |
// This time allow the old gen to be collected as well |
|
821 |
do_collection(true /* full */, |
|
822 |
clear_all_soft_refs /* clear_all_soft_refs */, |
|
823 |
0 /* size */, |
|
824 |
false /* is_tlab */, |
|
825 |
n_gens() - 1 /* max_level */); |
|
826 |
} |
|
827 |
} |
|
828 |
||
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
829 |
bool GenCollectedHeap::is_in_young(oop p) { |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
830 |
bool result = ((HeapWord*)p) < _gens[_n_gens - 1]->reserved().start(); |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
831 |
assert(result == _gens[0]->is_in_reserved(p), |
24424
2658d7834c6e
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
24353
diff
changeset
|
832 |
err_msg("incorrect test - result=%d, p=" INTPTR_FORMAT, result, p2i((void*)p))); |
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
833 |
return result; |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
834 |
} |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
835 |
|
11247 | 836 |
// Returns "TRUE" iff "p" points into the committed areas of the heap. |
1 | 837 |
bool GenCollectedHeap::is_in(const void* p) const { |
838 |
#ifndef ASSERT |
|
16680
960505df90e7
8011343: Add new flag for verifying the heap during startup
johnc
parents:
16385
diff
changeset
|
839 |
guarantee(VerifyBeforeGC || |
960505df90e7
8011343: Add new flag for verifying the heap during startup
johnc
parents:
16385
diff
changeset
|
840 |
VerifyDuringGC || |
960505df90e7
8011343: Add new flag for verifying the heap during startup
johnc
parents:
16385
diff
changeset
|
841 |
VerifyBeforeExit || |
960505df90e7
8011343: Add new flag for verifying the heap during startup
johnc
parents:
16385
diff
changeset
|
842 |
VerifyDuringStartup || |
960505df90e7
8011343: Add new flag for verifying the heap during startup
johnc
parents:
16385
diff
changeset
|
843 |
PrintAssembly || |
960505df90e7
8011343: Add new flag for verifying the heap during startup
johnc
parents:
16385
diff
changeset
|
844 |
tty->count() != 0 || // already printing |
960505df90e7
8011343: Add new flag for verifying the heap during startup
johnc
parents:
16385
diff
changeset
|
845 |
VerifyAfterGC || |
6176
4d9030fe341f
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
5906
diff
changeset
|
846 |
VMError::fatal_error_in_progress(), "too expensive"); |
4d9030fe341f
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
5906
diff
changeset
|
847 |
|
1 | 848 |
#endif |
849 |
// This might be sped up with a cache of the last generation that |
|
850 |
// answered yes. |
|
851 |
for (int i = 0; i < _n_gens; i++) { |
|
852 |
if (_gens[i]->is_in(p)) return true; |
|
853 |
} |
|
854 |
// Otherwise... |
|
855 |
return false; |
|
856 |
} |
|
857 |
||
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
858 |
#ifdef ASSERT |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
859 |
// Don't implement this by using is_in_young(). This method is used |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
860 |
// in some cases to check that is_in_young() is correct. |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
861 |
bool GenCollectedHeap::is_in_partial_collection(const void* p) { |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
862 |
assert(is_in_reserved(p) || p == NULL, |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
863 |
"Does not work if address is non-null and outside of the heap"); |
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
864 |
return p < _gens[_n_gens - 2]->reserved().end() && p != NULL; |
1 | 865 |
} |
9935
51267b5e1a3d
7041789: 30% perf regression with c2/arm following 7017732
jmasa
parents:
9623
diff
changeset
|
866 |
#endif |
1 | 867 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
868 |
void GenCollectedHeap::oop_iterate(ExtendedOopClosure* cl) { |
1 | 869 |
for (int i = 0; i < _n_gens; i++) { |
870 |
_gens[i]->oop_iterate(cl); |
|
871 |
} |
|
872 |
} |
|
873 |
||
874 |
void GenCollectedHeap::object_iterate(ObjectClosure* cl) { |
|
875 |
for (int i = 0; i < _n_gens; i++) { |
|
876 |
_gens[i]->object_iterate(cl); |
|
877 |
} |
|
878 |
} |
|
879 |
||
1893
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
880 |
void GenCollectedHeap::safe_object_iterate(ObjectClosure* cl) { |
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
881 |
for (int i = 0; i < _n_gens; i++) { |
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
882 |
_gens[i]->safe_object_iterate(cl); |
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
883 |
} |
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
884 |
} |
c82e388e17c5
6689653: JMapPerm fails with UseConcMarkSweepIncGC and compressed oops off
jmasa
parents:
1610
diff
changeset
|
885 |
|
1 | 886 |
Space* GenCollectedHeap::space_containing(const void* addr) const { |
887 |
for (int i = 0; i < _n_gens; i++) { |
|
888 |
Space* res = _gens[i]->space_containing(addr); |
|
889 |
if (res != NULL) return res; |
|
890 |
} |
|
891 |
// Otherwise... |
|
892 |
assert(false, "Could not find containing space"); |
|
893 |
return NULL; |
|
894 |
} |
|
895 |
||
896 |
||
897 |
HeapWord* GenCollectedHeap::block_start(const void* addr) const { |
|
898 |
assert(is_in_reserved(addr), "block_start of address outside of heap"); |
|
899 |
for (int i = 0; i < _n_gens; i++) { |
|
900 |
if (_gens[i]->is_in_reserved(addr)) { |
|
901 |
assert(_gens[i]->is_in(addr), |
|
902 |
"addr should be in allocated part of generation"); |
|
903 |
return _gens[i]->block_start(addr); |
|
904 |
} |
|
905 |
} |
|
906 |
assert(false, "Some generation should contain the address"); |
|
907 |
return NULL; |
|
908 |
} |
|
909 |
||
910 |
size_t GenCollectedHeap::block_size(const HeapWord* addr) const { |
|
911 |
assert(is_in_reserved(addr), "block_size of address outside of heap"); |
|
912 |
for (int i = 0; i < _n_gens; i++) { |
|
913 |
if (_gens[i]->is_in_reserved(addr)) { |
|
914 |
assert(_gens[i]->is_in(addr), |
|
915 |
"addr should be in allocated part of generation"); |
|
916 |
return _gens[i]->block_size(addr); |
|
917 |
} |
|
918 |
} |
|
919 |
assert(false, "Some generation should contain the address"); |
|
920 |
return 0; |
|
921 |
} |
|
922 |
||
923 |
bool GenCollectedHeap::block_is_obj(const HeapWord* addr) const { |
|
924 |
assert(is_in_reserved(addr), "block_is_obj of address outside of heap"); |
|
925 |
assert(block_start(addr) == addr, "addr must be a block start"); |
|
926 |
for (int i = 0; i < _n_gens; i++) { |
|
927 |
if (_gens[i]->is_in_reserved(addr)) { |
|
928 |
return _gens[i]->block_is_obj(addr); |
|
929 |
} |
|
930 |
} |
|
931 |
assert(false, "Some generation should contain the address"); |
|
932 |
return false; |
|
933 |
} |
|
934 |
||
935 |
bool GenCollectedHeap::supports_tlab_allocation() const { |
|
936 |
for (int i = 0; i < _n_gens; i += 1) { |
|
937 |
if (_gens[i]->supports_tlab_allocation()) { |
|
938 |
return true; |
|
939 |
} |
|
940 |
} |
|
941 |
return false; |
|
942 |
} |
|
943 |
||
944 |
size_t GenCollectedHeap::tlab_capacity(Thread* thr) const { |
|
945 |
size_t result = 0; |
|
946 |
for (int i = 0; i < _n_gens; i += 1) { |
|
947 |
if (_gens[i]->supports_tlab_allocation()) { |
|
948 |
result += _gens[i]->tlab_capacity(); |
|
949 |
} |
|
950 |
} |
|
951 |
return result; |
|
952 |
} |
|
953 |
||
22552 | 954 |
size_t GenCollectedHeap::tlab_used(Thread* thr) const { |
955 |
size_t result = 0; |
|
956 |
for (int i = 0; i < _n_gens; i += 1) { |
|
957 |
if (_gens[i]->supports_tlab_allocation()) { |
|
958 |
result += _gens[i]->tlab_used(); |
|
959 |
} |
|
960 |
} |
|
961 |
return result; |
|
962 |
} |
|
963 |
||
1 | 964 |
size_t GenCollectedHeap::unsafe_max_tlab_alloc(Thread* thr) const { |
965 |
size_t result = 0; |
|
966 |
for (int i = 0; i < _n_gens; i += 1) { |
|
967 |
if (_gens[i]->supports_tlab_allocation()) { |
|
968 |
result += _gens[i]->unsafe_max_tlab_alloc(); |
|
969 |
} |
|
970 |
} |
|
971 |
return result; |
|
972 |
} |
|
973 |
||
974 |
HeapWord* GenCollectedHeap::allocate_new_tlab(size_t size) { |
|
975 |
bool gc_overhead_limit_was_exceeded; |
|
9997
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
976 |
return collector_policy()->mem_allocate_work(size /* size */, |
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
977 |
true /* is_tlab */, |
b75b7939f448
6994322: Remove the is_tlab and is_noref / is_large_noref parameters from the CollectedHeap
tonyp
parents:
9995
diff
changeset
|
978 |
&gc_overhead_limit_was_exceeded); |
1 | 979 |
} |
980 |
||
981 |
// Requires "*prev_ptr" to be non-NULL. Deletes and a block of minimal size |
|
982 |
// from the list headed by "*prev_ptr". |
|
983 |
static ScratchBlock *removeSmallestScratch(ScratchBlock **prev_ptr) { |
|
984 |
bool first = true; |
|
985 |
size_t min_size = 0; // "first" makes this conceptually infinite. |
|
986 |
ScratchBlock **smallest_ptr, *smallest; |
|
987 |
ScratchBlock *cur = *prev_ptr; |
|
988 |
while (cur) { |
|
989 |
assert(*prev_ptr == cur, "just checking"); |
|
990 |
if (first || cur->num_words < min_size) { |
|
991 |
smallest_ptr = prev_ptr; |
|
992 |
smallest = cur; |
|
993 |
min_size = smallest->num_words; |
|
994 |
first = false; |
|
995 |
} |
|
996 |
prev_ptr = &cur->next; |
|
997 |
cur = cur->next; |
|
998 |
} |
|
999 |
smallest = *smallest_ptr; |
|
1000 |
*smallest_ptr = smallest->next; |
|
1001 |
return smallest; |
|
1002 |
} |
|
1003 |
||
1004 |
// Sort the scratch block list headed by res into decreasing size order, |
|
1005 |
// and set "res" to the result. |
|
1006 |
static void sort_scratch_list(ScratchBlock*& list) { |
|
1007 |
ScratchBlock* sorted = NULL; |
|
1008 |
ScratchBlock* unsorted = list; |
|
1009 |
while (unsorted) { |
|
1010 |
ScratchBlock *smallest = removeSmallestScratch(&unsorted); |
|
1011 |
smallest->next = sorted; |
|
1012 |
sorted = smallest; |
|
1013 |
} |
|
1014 |
list = sorted; |
|
1015 |
} |
|
1016 |
||
1017 |
ScratchBlock* GenCollectedHeap::gather_scratch(Generation* requestor, |
|
1018 |
size_t max_alloc_words) { |
|
1019 |
ScratchBlock* res = NULL; |
|
1020 |
for (int i = 0; i < _n_gens; i++) { |
|
1021 |
_gens[i]->contribute_scratch(res, requestor, max_alloc_words); |
|
1022 |
} |
|
1023 |
sort_scratch_list(res); |
|
1024 |
return res; |
|
1025 |
} |
|
1026 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1027 |
void GenCollectedHeap::release_scratch() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1028 |
for (int i = 0; i < _n_gens; i++) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1029 |
_gens[i]->reset_scratch(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1030 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1031 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1032 |
|
1 | 1033 |
class GenPrepareForVerifyClosure: public GenCollectedHeap::GenClosure { |
1034 |
void do_generation(Generation* gen) { |
|
1035 |
gen->prepare_for_verify(); |
|
1036 |
} |
|
1037 |
}; |
|
1038 |
||
1039 |
void GenCollectedHeap::prepare_for_verify() { |
|
1040 |
ensure_parsability(false); // no need to retire TLABs |
|
1041 |
GenPrepareForVerifyClosure blk; |
|
1042 |
generation_iterate(&blk, false); |
|
1043 |
} |
|
1044 |
||
1045 |
||
1046 |
void GenCollectedHeap::generation_iterate(GenClosure* cl, |
|
1047 |
bool old_to_young) { |
|
1048 |
if (old_to_young) { |
|
1049 |
for (int i = _n_gens-1; i >= 0; i--) { |
|
1050 |
cl->do_generation(_gens[i]); |
|
1051 |
} |
|
1052 |
} else { |
|
1053 |
for (int i = 0; i < _n_gens; i++) { |
|
1054 |
cl->do_generation(_gens[i]); |
|
1055 |
} |
|
1056 |
} |
|
1057 |
} |
|
1058 |
||
1059 |
void GenCollectedHeap::space_iterate(SpaceClosure* cl) { |
|
1060 |
for (int i = 0; i < _n_gens; i++) { |
|
1061 |
_gens[i]->space_iterate(cl, true); |
|
1062 |
} |
|
1063 |
} |
|
1064 |
||
1065 |
bool GenCollectedHeap::is_maximal_no_gc() const { |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
1066 |
for (int i = 0; i < _n_gens; i++) { |
1 | 1067 |
if (!_gens[i]->is_maximal_no_gc()) { |
1068 |
return false; |
|
1069 |
} |
|
1070 |
} |
|
1071 |
return true; |
|
1072 |
} |
|
1073 |
||
1074 |
void GenCollectedHeap::save_marks() { |
|
1075 |
for (int i = 0; i < _n_gens; i++) { |
|
1076 |
_gens[i]->save_marks(); |
|
1077 |
} |
|
1078 |
} |
|
1079 |
||
1080 |
GenCollectedHeap* GenCollectedHeap::heap() { |
|
1081 |
assert(_gch != NULL, "Uninitialized access to GenCollectedHeap::heap()"); |
|
1082 |
assert(_gch->kind() == CollectedHeap::GenCollectedHeap, "not a generational heap"); |
|
1083 |
return _gch; |
|
1084 |
} |
|
1085 |
||
1086 |
||
1087 |
void GenCollectedHeap::prepare_for_compaction() { |
|
19286
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1088 |
guarantee(_n_gens = 2, "Wrong number of generations"); |
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1089 |
Generation* old_gen = _gens[1]; |
1 | 1090 |
// Start by compacting into same gen. |
25730
7eb4e685f739
8048112: G1 Full GC needs to support the case when the very first region is not available
tschatzl
parents:
25492
diff
changeset
|
1091 |
CompactPoint cp(old_gen); |
19286
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1092 |
old_gen->prepare_for_compaction(&cp); |
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1093 |
Generation* young_gen = _gens[0]; |
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1094 |
young_gen->prepare_for_compaction(&cp); |
1 | 1095 |
} |
1096 |
||
1097 |
GCStats* GenCollectedHeap::gc_stats(int level) const { |
|
1098 |
return _gens[level]->gc_stats(); |
|
1099 |
} |
|
1100 |
||
12379 | 1101 |
void GenCollectedHeap::verify(bool silent, VerifyOption option /* ignored */) { |
1 | 1102 |
for (int i = _n_gens-1; i >= 0; i--) { |
1103 |
Generation* g = _gens[i]; |
|
1104 |
if (!silent) { |
|
24424
2658d7834c6e
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
24353
diff
changeset
|
1105 |
gclog_or_tty->print("%s", g->name()); |
1 | 1106 |
gclog_or_tty->print(" "); |
1107 |
} |
|
12379 | 1108 |
g->verify(); |
1 | 1109 |
} |
1110 |
if (!silent) { |
|
1111 |
gclog_or_tty->print("remset "); |
|
1112 |
} |
|
1113 |
rem_set()->verify(); |
|
1114 |
} |
|
1115 |
||
1116 |
void GenCollectedHeap::print_on(outputStream* st) const { |
|
1117 |
for (int i = 0; i < _n_gens; i++) { |
|
1118 |
_gens[i]->print_on(st); |
|
1119 |
} |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
1120 |
MetaspaceAux::print_on(st); |
1 | 1121 |
} |
1122 |
||
1123 |
void GenCollectedHeap::gc_threads_do(ThreadClosure* tc) const { |
|
1124 |
if (workers() != NULL) { |
|
1125 |
workers()->threads_do(tc); |
|
1126 |
} |
|
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
1127 |
#if INCLUDE_ALL_GCS |
1 | 1128 |
if (UseConcMarkSweepGC) { |
1129 |
ConcurrentMarkSweepThread::threads_do(tc); |
|
1130 |
} |
|
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
1131 |
#endif // INCLUDE_ALL_GCS |
1 | 1132 |
} |
1133 |
||
1134 |
void GenCollectedHeap::print_gc_threads_on(outputStream* st) const { |
|
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
1135 |
#if INCLUDE_ALL_GCS |
1 | 1136 |
if (UseParNewGC) { |
1137 |
workers()->print_worker_threads_on(st); |
|
1138 |
} |
|
1139 |
if (UseConcMarkSweepGC) { |
|
1140 |
ConcurrentMarkSweepThread::print_all_on(st); |
|
1141 |
} |
|
15482
470d0b0c09f1
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
14076
diff
changeset
|
1142 |
#endif // INCLUDE_ALL_GCS |
1 | 1143 |
} |
1144 |
||
16685
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1145 |
void GenCollectedHeap::print_on_error(outputStream* st) const { |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1146 |
this->CollectedHeap::print_on_error(st); |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1147 |
|
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1148 |
#if INCLUDE_ALL_GCS |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1149 |
if (UseConcMarkSweepGC) { |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1150 |
st->cr(); |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1151 |
CMSCollector::print_on_error(st); |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1152 |
} |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1153 |
#endif // INCLUDE_ALL_GCS |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1154 |
} |
41c34debcde0
8011872: Include Bit Map addresses in the hs_err files
stefank
parents:
16680
diff
changeset
|
1155 |
|
1 | 1156 |
void GenCollectedHeap::print_tracing_info() const { |
24941
4ebbe176a7b1
8042298: Remove the names gen0 and gen1 from the GC code
jwilhelm
parents:
24424
diff
changeset
|
1157 |
if (TraceYoungGenTime) { |
1 | 1158 |
get_gen(0)->print_summary_info(); |
1159 |
} |
|
24941
4ebbe176a7b1
8042298: Remove the names gen0 and gen1 from the GC code
jwilhelm
parents:
24424
diff
changeset
|
1160 |
if (TraceOldGenTime) { |
1 | 1161 |
get_gen(1)->print_summary_info(); |
1162 |
} |
|
1163 |
} |
|
1164 |
||
1165 |
void GenCollectedHeap::print_heap_change(size_t prev_used) const { |
|
1166 |
if (PrintGCDetails && Verbose) { |
|
1167 |
gclog_or_tty->print(" " SIZE_FORMAT |
|
1168 |
"->" SIZE_FORMAT |
|
1169 |
"(" SIZE_FORMAT ")", |
|
1170 |
prev_used, used(), capacity()); |
|
1171 |
} else { |
|
1172 |
gclog_or_tty->print(" " SIZE_FORMAT "K" |
|
1173 |
"->" SIZE_FORMAT "K" |
|
1174 |
"(" SIZE_FORMAT "K)", |
|
1175 |
prev_used / K, used() / K, capacity() / K); |
|
1176 |
} |
|
1177 |
} |
|
1178 |
||
1179 |
class GenGCPrologueClosure: public GenCollectedHeap::GenClosure { |
|
1180 |
private: |
|
1181 |
bool _full; |
|
1182 |
public: |
|
1183 |
void do_generation(Generation* gen) { |
|
1184 |
gen->gc_prologue(_full); |
|
1185 |
} |
|
1186 |
GenGCPrologueClosure(bool full) : _full(full) {}; |
|
1187 |
}; |
|
1188 |
||
1189 |
void GenCollectedHeap::gc_prologue(bool full) { |
|
1190 |
assert(InlineCacheBuffer::is_empty(), "should have cleaned up ICBuffer"); |
|
1191 |
||
1192 |
always_do_update_barrier = false; |
|
1193 |
// Fill TLAB's and such |
|
1194 |
CollectedHeap::accumulate_statistics_all_tlabs(); |
|
1195 |
ensure_parsability(true); // retire TLABs |
|
1196 |
||
1197 |
// Walk generations |
|
1198 |
GenGCPrologueClosure blk(full); |
|
1199 |
generation_iterate(&blk, false); // not old-to-young. |
|
1200 |
}; |
|
1201 |
||
1202 |
class GenGCEpilogueClosure: public GenCollectedHeap::GenClosure { |
|
1203 |
private: |
|
1204 |
bool _full; |
|
1205 |
public: |
|
1206 |
void do_generation(Generation* gen) { |
|
1207 |
gen->gc_epilogue(_full); |
|
1208 |
} |
|
1209 |
GenGCEpilogueClosure(bool full) : _full(full) {}; |
|
1210 |
}; |
|
1211 |
||
1212 |
void GenCollectedHeap::gc_epilogue(bool full) { |
|
1213 |
#ifdef COMPILER2 |
|
1214 |
assert(DerivedPointerTable::is_empty(), "derived pointer present"); |
|
1215 |
size_t actual_gap = pointer_delta((HeapWord*) (max_uintx-3), *(end_addr())); |
|
1216 |
guarantee(actual_gap > (size_t)FastAllocateSizeLimit, "inline allocation wraps"); |
|
1217 |
#endif /* COMPILER2 */ |
|
1218 |
||
1219 |
resize_all_tlabs(); |
|
1220 |
||
1221 |
GenGCEpilogueClosure blk(full); |
|
1222 |
generation_iterate(&blk, false); // not old-to-young. |
|
1223 |
||
10022
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
9997
diff
changeset
|
1224 |
if (!CleanChunkPoolAsync) { |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
9997
diff
changeset
|
1225 |
Chunk::clean_chunk_pool(); |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
9997
diff
changeset
|
1226 |
} |
377345fb5fb5
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
9997
diff
changeset
|
1227 |
|
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
1228 |
MetaspaceCounters::update_performance_counters(); |
19322
e35f9ed4f081
8014659: NPG: performance counters for compressed klass space
ehelin
parents:
19286
diff
changeset
|
1229 |
CompressedClassSpaceCounters::update_performance_counters(); |
13728
882756847a04
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
12781
diff
changeset
|
1230 |
|
1 | 1231 |
always_do_update_barrier = UseConcMarkSweepGC; |
1232 |
}; |
|
1233 |
||
971
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1234 |
#ifndef PRODUCT |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1235 |
class GenGCSaveTopsBeforeGCClosure: public GenCollectedHeap::GenClosure { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1236 |
private: |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1237 |
public: |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1238 |
void do_generation(Generation* gen) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1239 |
gen->record_spaces_top(); |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1240 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1241 |
}; |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1242 |
|
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1243 |
void GenCollectedHeap::record_gen_tops_before_GC() { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1244 |
if (ZapUnusedHeapArea) { |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1245 |
GenGCSaveTopsBeforeGCClosure blk; |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1246 |
generation_iterate(&blk, false); // not old-to-young. |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1247 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1248 |
} |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1249 |
#endif // not PRODUCT |
f0b20be4165d
6672698: mangle_unused_area() should not remangle the entire heap at each collection.
jmasa
parents:
360
diff
changeset
|
1250 |
|
1 | 1251 |
class GenEnsureParsabilityClosure: public GenCollectedHeap::GenClosure { |
1252 |
public: |
|
1253 |
void do_generation(Generation* gen) { |
|
1254 |
gen->ensure_parsability(); |
|
1255 |
} |
|
1256 |
}; |
|
1257 |
||
1258 |
void GenCollectedHeap::ensure_parsability(bool retire_tlabs) { |
|
1259 |
CollectedHeap::ensure_parsability(retire_tlabs); |
|
1260 |
GenEnsureParsabilityClosure ep_cl; |
|
1261 |
generation_iterate(&ep_cl, false); |
|
1262 |
} |
|
1263 |
||
19286
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1264 |
oop GenCollectedHeap::handle_failed_promotion(Generation* old_gen, |
1 | 1265 |
oop obj, |
360
21d113ecbf6a
6420645: Create a vm that uses compressed oops for up to 32gb heapsizes
coleenp
parents:
1
diff
changeset
|
1266 |
size_t obj_size) { |
19286
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1267 |
guarantee(old_gen->level() == 1, "We only get here with an old generation"); |
1 | 1268 |
assert(obj_size == (size_t)obj->size(), "bad obj_size passed in"); |
1269 |
HeapWord* result = NULL; |
|
1270 |
||
19286
48394008c803
8022800: Use specific generations rather than generation iteration
brutisso
parents:
18687
diff
changeset
|
1271 |
result = old_gen->expand_and_allocate(obj_size, false); |
1 | 1272 |
|
1273 |
if (result != NULL) { |
|
1274 |
Copy::aligned_disjoint_words((HeapWord*)obj, result, obj_size); |
|
1275 |
} |
|
1276 |
return oop(result); |
|
1277 |
} |
|
1278 |
||
1279 |
class GenTimeOfLastGCClosure: public GenCollectedHeap::GenClosure { |
|
1280 |
jlong _time; // in ms |
|
1281 |
jlong _now; // in ms |
|
1282 |
||
1283 |
public: |
|
1284 |
GenTimeOfLastGCClosure(jlong now) : _time(now), _now(now) { } |
|
1285 |
||
1286 |
jlong time() { return _time; } |
|
1287 |
||
1288 |
void do_generation(Generation* gen) { |
|
1289 |
_time = MIN2(_time, gen->time_of_last_gc(_now)); |
|
1290 |
} |
|
1291 |
}; |
|
1292 |
||
1293 |
jlong GenCollectedHeap::millis_since_last_gc() { |
|
22551 | 1294 |
// We need a monotonically non-decreasing time in ms but |
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1295 |
// os::javaTimeMillis() does not guarantee monotonicity. |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1296 |
jlong now = os::javaTimeNanos() / NANOSECS_PER_MILLISEC; |
1 | 1297 |
GenTimeOfLastGCClosure tolgc_cl(now); |
1298 |
// iterate over generations getting the oldest |
|
1299 |
// time that a generation was collected |
|
1300 |
generation_iterate(&tolgc_cl, false); |
|
11251
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1301 |
|
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1302 |
// javaTimeNanos() is guaranteed to be monotonically non-decreasing |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1303 |
// provided the underlying platform provides such a time source |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1304 |
// (and it is bug free). So we still have to guard against getting |
e29da6b5622b
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
johnc
parents:
11247
diff
changeset
|
1305 |
// back a time later than 'now'. |
1 | 1306 |
jlong retVal = now - tolgc_cl.time(); |
1307 |
if (retVal < 0) { |
|
24424
2658d7834c6e
8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents:
24353
diff
changeset
|
1308 |
NOT_PRODUCT(warning("time warp: "INT64_FORMAT, (int64_t) retVal);) |
1 | 1309 |
return 0; |
1310 |
} |
|
1311 |
return retVal; |
|
1312 |
} |