src/hotspot/share/gc/shared/gcVMOperations.hpp
author kbarrett
Wed, 31 Jul 2019 14:28:51 -0400
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8048556: Unnecessary GCLocker-initiated young GCs Summary: Fixed recognition of unnecessary GCLocker collections. Reviewed-by: pliden, tschatzl
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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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#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 "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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  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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  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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  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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  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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  bool        _tlab;                       // alloc is of a tlab.
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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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  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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  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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  JvmtiGCMarker _jgcm;
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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