| /* |
| * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| */ |
| |
| // The following class hierarchy represents |
| // a set of operations (VM_Operation) related to GC. |
| // |
| // VM_Operation |
| // VM_GC_Operation |
| // VM_GC_HeapInspection |
| // VM_GenCollectForAllocation |
| // VM_GenCollectFull |
| // VM_GenCollectFullConcurrent |
| // VM_ParallelGCFailedAllocation |
| // VM_ParallelGCFailedPermanentAllocation |
| // VM_ParallelGCSystemGC |
| // VM_GC_Operation |
| // - implements methods common to all classes in the hierarchy: |
| // prevents multiple gc requests and manages lock on heap; |
| // |
| // VM_GC_HeapInspection |
| // - prints class histogram on SIGBREAK if PrintClassHistogram |
| // is specified; and also the attach "inspectheap" operation |
| // |
| // VM_GenCollectForAllocation |
| // VM_ParallelGCFailedAllocation |
| // VM_ParallelGCFailedPermanentAllocation |
| // - this operation is invoked when allocation is failed; |
| // operation performs garbage collection and tries to |
| // allocate afterwards; |
| // |
| // VM_GenCollectFull |
| // VM_GenCollectFullConcurrent |
| // VM_ParallelGCSystemGC |
| // - these operations preform full collection of heaps of |
| // different kind |
| // |
| |
| class VM_GC_Operation: public VM_Operation { |
| protected: |
| BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL) |
| unsigned int _gc_count_before; // gc count before acquiring PLL |
| unsigned int _full_gc_count_before; // full gc count before acquiring PLL |
| bool _full; // whether a "full" collection |
| bool _prologue_succeeded; // whether doit_prologue succeeded |
| GCCause::Cause _gc_cause; // the putative cause for this gc op |
| bool _gc_locked; // will be set if gc was locked |
| |
| virtual bool skip_operation() const; |
| |
| // java.lang.ref.Reference support |
| void acquire_pending_list_lock(); |
| void release_and_notify_pending_list_lock(); |
| |
| public: |
| VM_GC_Operation(unsigned int gc_count_before, |
| unsigned int full_gc_count_before = 0, |
| bool full = false) { |
| _full = full; |
| _prologue_succeeded = false; |
| _gc_count_before = gc_count_before; |
| |
| // A subclass constructor will likely overwrite the following |
| _gc_cause = GCCause::_no_cause_specified; |
| |
| _gc_locked = false; |
| |
| if (full) { |
| _full_gc_count_before = full_gc_count_before; |
| } |
| } |
| ~VM_GC_Operation() {} |
| |
| // Acquire the reference synchronization lock |
| virtual bool doit_prologue(); |
| // Do notifyAll (if needed) and release held lock |
| virtual void doit_epilogue(); |
| |
| virtual bool allow_nested_vm_operations() const { return true; } |
| bool prologue_succeeded() const { return _prologue_succeeded; } |
| |
| void set_gc_locked() { _gc_locked = true; } |
| bool gc_locked() const { return _gc_locked; } |
| |
| static void notify_gc_begin(bool full = false); |
| static void notify_gc_end(); |
| }; |
| |
| |
| class VM_GC_HeapInspection: public VM_GC_Operation { |
| private: |
| outputStream* _out; |
| bool _full_gc; |
| public: |
| VM_GC_HeapInspection(outputStream* out, bool request_full_gc) : |
| VM_GC_Operation(0 /* total collections, dummy, ignored */, |
| 0 /* total full collections, dummy, ignored */, |
| request_full_gc) { |
| _out = out; |
| _full_gc = request_full_gc; |
| } |
| |
| ~VM_GC_HeapInspection() {} |
| virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } |
| virtual bool skip_operation() const; |
| virtual bool doit_prologue(); |
| virtual void doit(); |
| }; |
| |
| |
| class VM_GenCollectForAllocation: public VM_GC_Operation { |
| private: |
| HeapWord* _res; |
| size_t _size; // size of object to be allocated. |
| bool _tlab; // alloc is of a tlab. |
| public: |
| VM_GenCollectForAllocation(size_t size, |
| bool tlab, |
| unsigned int gc_count_before) |
| : VM_GC_Operation(gc_count_before), |
| _size(size), |
| _tlab(tlab) { |
| _res = NULL; |
| } |
| ~VM_GenCollectForAllocation() {} |
| virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } |
| virtual void doit(); |
| HeapWord* result() const { return _res; } |
| }; |
| |
| |
| // VM operation to invoke a collection of the heap as a |
| // GenCollectedHeap heap. |
| class VM_GenCollectFull: public VM_GC_Operation { |
| private: |
| int _max_level; |
| public: |
| VM_GenCollectFull(unsigned int gc_count_before, |
| unsigned int full_gc_count_before, |
| GCCause::Cause gc_cause, |
| int max_level) |
| : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */), |
| _max_level(max_level) |
| { _gc_cause = gc_cause; } |
| ~VM_GenCollectFull() {} |
| virtual VMOp_Type type() const { return VMOp_GenCollectFull; } |
| virtual void doit(); |
| }; |