author | stuefe |
Tue, 26 Nov 2019 16:21:29 +0100 | |
branch | stuefe-new-metaspace-branch |
changeset 59272 | 54750b448264 |
parent 58063 | bdf136b8ae0e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2005, 2019, 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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#ifndef SHARE_GC_SHARED_GCVMOPERATIONS_HPP |
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#define SHARE_GC_SHARED_GCVMOPERATIONS_HPP |
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#include "gc/shared/collectedHeap.hpp" |
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#include "gc/shared/genCollectedHeap.hpp" |
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#include "memory/heapInspection.hpp" |
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#include "memory/metaspace.hpp" |
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#include "prims/jvmtiExport.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/vmOperations.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_GenCollectFull |
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// VM_GenCollectFullConcurrent |
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// VM_ParallelGCSystemGC |
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// VM_CollectForAllocation |
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// VM_GenCollectForAllocation |
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// VM_ParallelGCFailedAllocation |
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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_CollectForAllocation |
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// VM_GenCollectForAllocation |
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// VM_ParallelGCFailedAllocation |
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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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uint _gc_count_before; // gc count before acquiring PLL |
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uint _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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public: |
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VM_GC_Operation(uint gc_count_before, |
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GCCause::Cause _cause, |
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uint 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 = _cause; |
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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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// 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 _csv_format; // "comma separated values" format for spreadsheet. |
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bool _print_help; |
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bool _print_class_stats; |
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const char* _columns; |
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public: |
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VM_GC_HeapInspection(outputStream* out, bool request_full_gc) : |
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VM_GC_Operation(0 /* total collections, dummy, ignored */, |
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GCCause::_heap_inspection /* GC Cause */, |
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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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_csv_format = false; |
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_print_help = false; |
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_print_class_stats = false; |
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_columns = NULL; |
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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 void doit(); |
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void set_csv_format(bool value) {_csv_format = value;} |
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void set_print_help(bool value) {_print_help = value;} |
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void set_print_class_stats(bool value) {_print_class_stats = value;} |
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void set_columns(const char* value) {_columns = value;} |
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protected: |
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bool collect(); |
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}; |
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class VM_CollectForAllocation : public VM_GC_Operation { |
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protected: |
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size_t _word_size; // Size of object to be allocated (in number of words) |
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HeapWord* _result; // Allocation result (NULL if allocation failed) |
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public: |
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VM_CollectForAllocation(size_t word_size, uint gc_count_before, GCCause::Cause cause); |
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HeapWord* result() const { |
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return _result; |
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} |
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}; |
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class VM_GenCollectForAllocation : public VM_CollectForAllocation { |
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private: |
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bool _tlab; // alloc is of a tlab. |
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public: |
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VM_GenCollectForAllocation(size_t word_size, |
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bool tlab, |
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uint gc_count_before) |
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: VM_CollectForAllocation(word_size, gc_count_before, GCCause::_allocation_failure), |
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_tlab(tlab) { |
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assert(word_size != 0, "An allocation should always be requested with this operation."); |
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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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}; |
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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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GenCollectedHeap::GenerationType _max_generation; |
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public: |
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VM_GenCollectFull(uint gc_count_before, |
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uint full_gc_count_before, |
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GCCause::Cause gc_cause, |
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GenCollectedHeap::GenerationType max_generation) |
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: VM_GC_Operation(gc_count_before, gc_cause, full_gc_count_before, |
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max_generation != GenCollectedHeap::YoungGen /* full */), |
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_max_generation(max_generation) { } |
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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_CollectForMetadataAllocation: public VM_GC_Operation { |
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private: |
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MetaWord* _result; |
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size_t _size; // size of object to be allocated |
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Metaspace::MetadataType _mdtype; |
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ClassLoaderData* _loader_data; |
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VM_CollectForMetadataAllocation(ClassLoaderData* loader_data, |
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size_t size, |
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Metaspace::MetadataType mdtype, |
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uint gc_count_before, |
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uint full_gc_count_before, |
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GCCause::Cause gc_cause); |
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virtual VMOp_Type type() const { return VMOp_CollectForMetadataAllocation; } |
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virtual void doit(); |
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MetaWord* result() const { return _result; } |
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bool initiate_concurrent_GC(); |
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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, CONCURRENT } 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_GC_SHARED_GCVMOPERATIONS_HPP |