author | drchase |
Fri, 09 May 2014 16:50:54 -0400 | |
changeset 24424 | 2658d7834c6e |
parent 24092 | e274d864545a |
child 24429 | 4efc66ee325c |
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 "code/codeCache.hpp" |
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#include "gc_interface/collectedHeap.inline.hpp" |
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#include "memory/sharedHeap.hpp" |
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#include "oops/oop.inline.hpp" |
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#include "runtime/fprofiler.hpp" |
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#include "runtime/java.hpp" |
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#include "services/management.hpp" |
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#include "utilities/copy.hpp" |
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#include "utilities/workgroup.hpp" |
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PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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SharedHeap* SharedHeap::_sh; |
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||
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// The set of potentially parallel tasks in strong root scanning. |
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enum SH_process_strong_roots_tasks { |
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SH_PS_Universe_oops_do, |
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SH_PS_JNIHandles_oops_do, |
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SH_PS_ObjectSynchronizer_oops_do, |
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SH_PS_FlatProfiler_oops_do, |
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SH_PS_Management_oops_do, |
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SH_PS_SystemDictionary_oops_do, |
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SH_PS_ClassLoaderDataGraph_oops_do, |
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SH_PS_jvmti_oops_do, |
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SH_PS_CodeCache_oops_do, |
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// Leave this one last. |
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SH_PS_NumElements |
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}; |
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||
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SharedHeap::SharedHeap(CollectorPolicy* policy_) : |
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CollectedHeap(), |
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_collector_policy(policy_), |
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_rem_set(NULL), |
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_strong_roots_parity(0), |
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_process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), |
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_workers(NULL) |
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{ |
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if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { |
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vm_exit_during_initialization("Failed necessary allocation."); |
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} |
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_sh = this; // ch is static, should be set only once. |
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if ((UseParNewGC || |
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(UseConcMarkSweepGC && (CMSParallelInitialMarkEnabled || |
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CMSParallelRemarkEnabled)) || |
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UseG1GC) && |
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ParallelGCThreads > 0) { |
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_workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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/* are_GC_task_threads */true, |
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/* are_ConcurrentGC_threads */false); |
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if (_workers == NULL) { |
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vm_exit_during_initialization("Failed necessary allocation."); |
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} else { |
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_workers->initialize_workers(); |
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} |
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} |
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} |
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||
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int SharedHeap::n_termination() { |
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return _process_strong_tasks->n_threads(); |
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} |
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void SharedHeap::set_n_termination(int t) { |
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_process_strong_tasks->set_n_threads(t); |
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} |
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bool SharedHeap::heap_lock_held_for_gc() { |
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Thread* t = Thread::current(); |
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return Heap_lock->owned_by_self() |
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|| ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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&& _thread_holds_heap_lock_for_gc); |
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} |
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void SharedHeap::set_par_threads(uint t) { |
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assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
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_n_par_threads = t; |
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_process_strong_tasks->set_n_threads(t); |
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} |
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#ifdef ASSERT |
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class AssertNonScavengableClosure: public OopClosure { |
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public: |
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virtual void do_oop(oop* p) { |
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assert(!Universe::heap()->is_in_partial_collection(*p), |
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"Referent should not be scavengable."); } |
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virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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}; |
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static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
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#endif |
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void SharedHeap::change_strong_roots_parity() { |
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// Also set the new collection parity. |
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assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, |
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"Not in range."); |
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_strong_roots_parity++; |
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if (_strong_roots_parity == 3) _strong_roots_parity = 1; |
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assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, |
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"Not in range."); |
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} |
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SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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: MarkScope(activate) |
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{ |
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if (_active) { |
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outer->change_strong_roots_parity(); |
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// Zero the claimed high water mark in the StringTable |
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StringTable::clear_parallel_claimed_index(); |
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} |
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} |
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SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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// nothing particular |
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} |
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void SharedHeap::process_strong_roots(bool activate_scope, |
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ScanningOption so, |
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OopClosure* roots, |
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KlassClosure* klass_closure) { |
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StrongRootsScope srs(this, activate_scope); |
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// General strong roots. |
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assert(_strong_roots_parity != 0, "must have called prologue code"); |
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// _n_termination for _process_strong_tasks should be set up stream |
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// in a method not running in a GC worker. Otherwise the GC worker |
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// could be trying to change the termination condition while the task |
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// is executing in another GC worker. |
1 | 153 |
if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
154 |
Universe::oops_do(roots); |
|
155 |
} |
|
156 |
// Global (strong) JNI handles |
|
157 |
if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) |
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JNIHandles::oops_do(roots); |
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CodeBlobToOopClosure code_roots(roots, true); |
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CLDToOopClosure roots_from_clds(roots); |
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// If we limit class scanning to SO_SystemClasses we need to apply a CLD closure to |
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// CLDs which are strongly reachable from the thread stacks. |
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CLDToOopClosure* roots_from_clds_p = ((so & SO_SystemClasses) ? &roots_from_clds : NULL); |
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// All threads execute this; the individual threads are task groups. |
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if (CollectedHeap::use_parallel_gc_threads()) { |
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Threads::possibly_parallel_oops_do(roots, roots_from_clds_p, &code_roots); |
1 | 169 |
} else { |
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Threads::oops_do(roots, roots_from_clds_p, &code_roots); |
1 | 171 |
} |
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|
1 | 173 |
if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) |
174 |
ObjectSynchronizer::oops_do(roots); |
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175 |
if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) |
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176 |
FlatProfiler::oops_do(roots); |
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177 |
if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) |
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178 |
Management::oops_do(roots); |
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179 |
if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) |
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180 |
JvmtiExport::oops_do(roots); |
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181 |
||
182 |
if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { |
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183 |
if (so & SO_AllClasses) { |
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184 |
SystemDictionary::oops_do(roots); |
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} else if (so & SO_SystemClasses) { |
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SystemDictionary::always_strong_oops_do(roots); |
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} else { |
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fatal("We should always have selected either SO_AllClasses or SO_SystemClasses"); |
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} |
1 | 190 |
} |
191 |
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if (!_process_strong_tasks->is_task_claimed(SH_PS_ClassLoaderDataGraph_oops_do)) { |
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if (so & SO_AllClasses) { |
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ClassLoaderDataGraph::oops_do(roots, klass_closure, /* must_claim */ false); |
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} else if (so & SO_SystemClasses) { |
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ClassLoaderDataGraph::always_strong_oops_do(roots, klass_closure, /* must_claim */ true); |
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} |
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} |
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199 |
|
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// All threads execute the following. A specific chunk of buckets |
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// from the StringTable are the individual tasks. |
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if (so & SO_Strings) { |
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if (CollectedHeap::use_parallel_gc_threads()) { |
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StringTable::possibly_parallel_oops_do(roots); |
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} else { |
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StringTable::oops_do(roots); |
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} |
1 | 208 |
} |
209 |
||
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if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { |
|
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if (so & SO_ScavengeCodeCache) { |
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assert(&code_roots != NULL, "must supply closure for code cache"); |
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213 |
|
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// We only visit parts of the CodeCache when scavenging. |
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CodeCache::scavenge_root_nmethods_do(&code_roots); |
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} |
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if (so & SO_AllCodeCache) { |
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assert(&code_roots != NULL, "must supply closure for code cache"); |
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219 |
|
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// CMSCollector uses this to do intermediate-strength collections. |
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// We scan the entire code cache, since CodeCache::do_unloading is not called. |
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CodeCache::blobs_do(&code_roots); |
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} |
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// Verify that the code cache contents are not subject to |
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// movement by a scavenging collection. |
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DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, /*do_marking=*/ false)); |
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DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
1 | 228 |
} |
229 |
||
230 |
_process_strong_tasks->all_tasks_completed(); |
|
231 |
} |
|
232 |
||
233 |
class AlwaysTrueClosure: public BoolObjectClosure { |
|
234 |
public: |
|
235 |
bool do_object_b(oop p) { return true; } |
|
236 |
}; |
|
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static AlwaysTrueClosure always_true; |
|
238 |
||
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void SharedHeap::process_weak_roots(OopClosure* root_closure) { |
1 | 240 |
// Global (weak) JNI handles |
241 |
JNIHandles::weak_oops_do(&always_true, root_closure); |
|
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242 |
} |
1 | 243 |
|
244 |
void SharedHeap::set_barrier_set(BarrierSet* bs) { |
|
245 |
_barrier_set = bs; |
|
246 |
// Cached barrier set for fast access in oops |
|
247 |
oopDesc::set_bs(bs); |
|
248 |
} |
|
249 |
||
250 |
void SharedHeap::post_initialize() { |
|
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CollectedHeap::post_initialize(); |
1 | 252 |
ref_processing_init(); |
253 |
} |
|
254 |
||
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void SharedHeap::ref_processing_init() {} |
1 | 256 |
|
257 |
// Some utilities. |
|
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void SharedHeap::print_size_transition(outputStream* out, |
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size_t bytes_before, |
1 | 260 |
size_t bytes_after, |
261 |
size_t capacity) { |
|
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262 |
out->print(" " SIZE_FORMAT "%s->" SIZE_FORMAT "%s(" SIZE_FORMAT "%s)", |
1 | 263 |
byte_size_in_proper_unit(bytes_before), |
264 |
proper_unit_for_byte_size(bytes_before), |
|
265 |
byte_size_in_proper_unit(bytes_after), |
|
266 |
proper_unit_for_byte_size(bytes_after), |
|
267 |
byte_size_in_proper_unit(capacity), |
|
268 |
proper_unit_for_byte_size(capacity)); |
|
269 |
} |