242 lines
8.3 KiB
C++
242 lines
8.3 KiB
C++
/*
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* Copyright (c) 2005, 2018, 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_SHARED_VMGCOPERATIONS_HPP
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#define SHARE_VM_GC_SHARED_VMGCOPERATIONS_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 "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/vm_operations.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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private:
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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, true /* 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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public:
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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, 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_SHARED_VMGCOPERATIONS_HPP
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