| /* |
| * Copyright (c) 2005, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_SHARED_VMGCOPERATIONS_HPP |
| #define SHARE_VM_GC_SHARED_VMGCOPERATIONS_HPP |
| |
| #include "gc/shared/collectedHeap.hpp" |
| #include "gc/shared/genCollectedHeap.hpp" |
| #include "memory/heapInspection.hpp" |
| #include "prims/jvmtiExport.hpp" |
| #include "runtime/handles.hpp" |
| #include "runtime/jniHandles.hpp" |
| #include "runtime/synchronizer.hpp" |
| #include "runtime/vm_operations.hpp" |
| |
| // The following class hierarchy represents |
| // a set of operations (VM_Operation) related to GC. |
| // |
| // VM_Operation |
| // VM_GC_Operation |
| // VM_GC_HeapInspection |
| // VM_GenCollectFull |
| // VM_GenCollectFullConcurrent |
| // VM_ParallelGCSystemGC |
| // VM_CollectForAllocation |
| // VM_GenCollectForAllocation |
| // VM_ParallelGCFailedAllocation |
| // 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_CollectForAllocation |
| // VM_GenCollectForAllocation |
| // VM_ParallelGCFailedAllocation |
| // - 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: |
| uint _gc_count_before; // gc count before acquiring PLL |
| uint _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; |
| |
| public: |
| VM_GC_Operation(uint gc_count_before, |
| GCCause::Cause _cause, |
| uint 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 = _cause; |
| |
| _gc_locked = false; |
| |
| _full_gc_count_before = full_gc_count_before; |
| // In ParallelScavengeHeap::mem_allocate() collections can be |
| // executed within a loop and _all_soft_refs_clear can be set |
| // true after they have been cleared by a collection and another |
| // collection started so that _all_soft_refs_clear can be true |
| // when this collection is started. Don't assert that |
| // _all_soft_refs_clear have to be false here even though |
| // mutators have run. Soft refs will be cleared again in this |
| // collection. |
| } |
| ~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; |
| bool _csv_format; // "comma separated values" format for spreadsheet. |
| bool _print_help; |
| bool _print_class_stats; |
| const char* _columns; |
| public: |
| VM_GC_HeapInspection(outputStream* out, bool request_full_gc) : |
| VM_GC_Operation(0 /* total collections, dummy, ignored */, |
| GCCause::_heap_inspection /* GC Cause */, |
| 0 /* total full collections, dummy, ignored */, |
| request_full_gc) { |
| _out = out; |
| _full_gc = request_full_gc; |
| _csv_format = false; |
| _print_help = false; |
| _print_class_stats = false; |
| _columns = NULL; |
| } |
| |
| ~VM_GC_HeapInspection() {} |
| virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } |
| virtual bool skip_operation() const; |
| virtual void doit(); |
| void set_csv_format(bool value) {_csv_format = value;} |
| void set_print_help(bool value) {_print_help = value;} |
| void set_print_class_stats(bool value) {_print_class_stats = value;} |
| void set_columns(const char* value) {_columns = value;} |
| protected: |
| bool collect(); |
| }; |
| |
| class VM_CollectForAllocation : public VM_GC_Operation { |
| protected: |
| size_t _word_size; // Size of object to be allocated (in number of words) |
| HeapWord* _result; // Allocation result (NULL if allocation failed) |
| |
| public: |
| VM_CollectForAllocation(size_t word_size, uint gc_count_before, GCCause::Cause cause); |
| |
| HeapWord* result() const { |
| return _result; |
| } |
| }; |
| |
| class VM_GenCollectForAllocation : public VM_CollectForAllocation { |
| private: |
| bool _tlab; // alloc is of a tlab. |
| public: |
| VM_GenCollectForAllocation(size_t word_size, |
| bool tlab, |
| uint gc_count_before) |
| : VM_CollectForAllocation(word_size, gc_count_before, GCCause::_allocation_failure), |
| _tlab(tlab) { |
| assert(word_size != 0, "An allocation should always be requested with this operation."); |
| } |
| ~VM_GenCollectForAllocation() {} |
| virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } |
| virtual void doit(); |
| }; |
| |
| // VM operation to invoke a collection of the heap as a |
| // GenCollectedHeap heap. |
| class VM_GenCollectFull: public VM_GC_Operation { |
| private: |
| GenCollectedHeap::GenerationType _max_generation; |
| public: |
| VM_GenCollectFull(uint gc_count_before, |
| uint full_gc_count_before, |
| GCCause::Cause gc_cause, |
| GenCollectedHeap::GenerationType max_generation) |
| : VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, true /* full */), |
| _max_generation(max_generation) { } |
| ~VM_GenCollectFull() {} |
| virtual VMOp_Type type() const { return VMOp_GenCollectFull; } |
| virtual void doit(); |
| }; |
| |
| class VM_CollectForMetadataAllocation: public VM_GC_Operation { |
| private: |
| MetaWord* _result; |
| size_t _size; // size of object to be allocated |
| Metaspace::MetadataType _mdtype; |
| ClassLoaderData* _loader_data; |
| |
| public: |
| VM_CollectForMetadataAllocation(ClassLoaderData* loader_data, |
| size_t size, |
| Metaspace::MetadataType mdtype, |
| uint gc_count_before, |
| uint full_gc_count_before, |
| GCCause::Cause gc_cause); |
| |
| virtual VMOp_Type type() const { return VMOp_CollectForMetadataAllocation; } |
| virtual void doit(); |
| MetaWord* result() const { return _result; } |
| |
| bool initiate_concurrent_GC(); |
| }; |
| |
| class SvcGCMarker : public StackObj { |
| private: |
| JvmtiGCMarker _jgcm; |
| public: |
| typedef enum { MINOR, FULL, OTHER } reason_type; |
| |
| SvcGCMarker(reason_type reason ) { |
| VM_GC_Operation::notify_gc_begin(reason == FULL); |
| } |
| |
| ~SvcGCMarker() { |
| VM_GC_Operation::notify_gc_end(); |
| } |
| }; |
| |
| #endif // SHARE_VM_GC_SHARED_VMGCOPERATIONS_HPP |