author | kamg |
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/* |
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP |
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#include "memory/heapInspection.hpp" |
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#include "runtime/handles.hpp" |
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#include "runtime/jniHandles.hpp" |
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#include "runtime/synchronizer.hpp" |
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#include "runtime/vm_operations.hpp" |
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#include "prims/jvmtiExport.hpp" |
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// The following class hierarchy represents |
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// a set of operations (VM_Operation) related to GC. |
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// |
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// VM_Operation |
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// VM_GC_Operation |
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// VM_GC_HeapInspection |
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// VM_GenCollectForAllocation |
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// VM_GenCollectFull |
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// VM_GenCollectFullConcurrent |
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// VM_ParallelGCFailedAllocation |
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// VM_ParallelGCFailedPermanentAllocation |
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// VM_ParallelGCSystemGC |
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// VM_GC_Operation |
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// - implements methods common to all classes in the hierarchy: |
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// prevents multiple gc requests and manages lock on heap; |
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// |
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// VM_GC_HeapInspection |
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// - prints class histogram on SIGBREAK if PrintClassHistogram |
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// is specified; and also the attach "inspectheap" operation |
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// |
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// VM_GenCollectForAllocation |
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// VM_GenCollectForPermanentAllocation |
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// VM_ParallelGCFailedAllocation |
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// VM_ParallelGCFailedPermanentAllocation |
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// - this operation is invoked when allocation is failed; |
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// operation performs garbage collection and tries to |
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// allocate afterwards; |
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// |
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// VM_GenCollectFull |
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// VM_GenCollectFullConcurrent |
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// VM_ParallelGCSystemGC |
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// - these operations preform full collection of heaps of |
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// different kind |
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// |
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class VM_GC_Operation: public VM_Operation { |
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protected: |
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BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL) |
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unsigned int _gc_count_before; // gc count before acquiring PLL |
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unsigned int _full_gc_count_before; // full gc count before acquiring PLL |
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bool _full; // whether a "full" collection |
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bool _prologue_succeeded; // whether doit_prologue succeeded |
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GCCause::Cause _gc_cause; // the putative cause for this gc op |
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bool _gc_locked; // will be set if gc was locked |
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virtual bool skip_operation() const; |
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// java.lang.ref.Reference support |
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void acquire_pending_list_lock(); |
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void release_and_notify_pending_list_lock(); |
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public: |
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VM_GC_Operation(unsigned int gc_count_before, |
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unsigned int full_gc_count_before = 0, |
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bool full = false) { |
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_full = full; |
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_prologue_succeeded = false; |
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_gc_count_before = gc_count_before; |
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// A subclass constructor will likely overwrite the following |
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_gc_cause = GCCause::_no_cause_specified; |
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_gc_locked = false; |
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_full_gc_count_before = full_gc_count_before; |
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// In ParallelScavengeHeap::mem_allocate() collections can be |
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// executed within a loop and _all_soft_refs_clear can be set |
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// true after they have been cleared by a collection and another |
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// collection started so that _all_soft_refs_clear can be true |
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// when this collection is started. Don't assert that |
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// _all_soft_refs_clear have to be false here even though |
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// mutators have run. Soft refs will be cleared again in this |
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// collection. |
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} |
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~VM_GC_Operation() { |
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CollectedHeap* ch = Universe::heap(); |
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ch->collector_policy()->set_all_soft_refs_clear(false); |
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} |
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// Acquire the reference synchronization lock |
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virtual bool doit_prologue(); |
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// Do notifyAll (if needed) and release held lock |
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virtual void doit_epilogue(); |
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virtual bool allow_nested_vm_operations() const { return true; } |
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bool prologue_succeeded() const { return _prologue_succeeded; } |
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void set_gc_locked() { _gc_locked = true; } |
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bool gc_locked() const { return _gc_locked; } |
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static void notify_gc_begin(bool full = false); |
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static void notify_gc_end(); |
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}; |
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class VM_GC_HeapInspection: public VM_GC_Operation { |
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private: |
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outputStream* _out; |
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bool _full_gc; |
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bool _need_prologue; |
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VM_GC_HeapInspection(outputStream* out, bool request_full_gc, |
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bool need_prologue) : |
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VM_GC_Operation(0 /* total collections, dummy, ignored */, |
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0 /* total full collections, dummy, ignored */, |
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request_full_gc) { |
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_out = out; |
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_full_gc = request_full_gc; |
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_need_prologue = need_prologue; |
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} |
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~VM_GC_HeapInspection() {} |
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virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } |
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virtual bool skip_operation() const; |
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virtual bool doit_prologue(); |
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virtual void doit(); |
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}; |
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class VM_GenCollectForAllocation: public VM_GC_Operation { |
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private: |
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HeapWord* _res; |
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size_t _size; // size of object to be allocated. |
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bool _tlab; // alloc is of a tlab. |
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public: |
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VM_GenCollectForAllocation(size_t size, |
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bool tlab, |
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unsigned int gc_count_before) |
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: VM_GC_Operation(gc_count_before), |
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_size(size), |
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_tlab(tlab) { |
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_res = NULL; |
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} |
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~VM_GenCollectForAllocation() {} |
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virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } |
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virtual void doit(); |
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HeapWord* result() const { return _res; } |
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}; |
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// VM operation to invoke a collection of the heap as a |
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// GenCollectedHeap heap. |
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class VM_GenCollectFull: public VM_GC_Operation { |
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private: |
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int _max_level; |
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public: |
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VM_GenCollectFull(unsigned int gc_count_before, |
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unsigned int full_gc_count_before, |
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GCCause::Cause gc_cause, |
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int max_level) |
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: VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */), |
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_max_level(max_level) |
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{ _gc_cause = gc_cause; } |
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~VM_GenCollectFull() {} |
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virtual VMOp_Type type() const { return VMOp_GenCollectFull; } |
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virtual void doit(); |
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}; |
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class VM_GenCollectForPermanentAllocation: public VM_GC_Operation { |
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private: |
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HeapWord* _res; |
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size_t _size; // size of object to be allocated |
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public: |
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VM_GenCollectForPermanentAllocation(size_t size, |
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unsigned int gc_count_before, |
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unsigned int full_gc_count_before, |
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GCCause::Cause gc_cause) |
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: VM_GC_Operation(gc_count_before, full_gc_count_before, true), |
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_size(size) { |
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_res = NULL; |
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_gc_cause = gc_cause; |
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} |
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~VM_GenCollectForPermanentAllocation() {} |
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virtual VMOp_Type type() const { return VMOp_GenCollectForPermanentAllocation; } |
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virtual void doit(); |
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HeapWord* result() const { return _res; } |
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}; |
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class SvcGCMarker : public StackObj { |
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private: |
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JvmtiGCMarker _jgcm; |
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public: |
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typedef enum { MINOR, FULL, OTHER } reason_type; |
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SvcGCMarker(reason_type reason ) { |
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VM_GC_Operation::notify_gc_begin(reason == FULL); |
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} |
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~SvcGCMarker() { |
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VM_GC_Operation::notify_gc_end(); |
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} |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_VMGCOPERATIONS_HPP |