hotspot/src/share/vm/memory/collectorPolicy.hpp
author coleenp
Sat, 01 Sep 2012 13:25:18 -0400
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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
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/*
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 * Copyright (c) 2001, 2012, 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_MEMORY_COLLECTORPOLICY_HPP
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#define SHARE_VM_MEMORY_COLLECTORPOLICY_HPP
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#include "memory/allocation.hpp"
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#include "memory/barrierSet.hpp"
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#include "memory/generationSpec.hpp"
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#include "memory/genRemSet.hpp"
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// This class (or more correctly, subtypes of this class)
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// are used to define global garbage collector attributes.
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// This includes initialization of generations and any other
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// shared resources they may need.
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//
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// In general, all flag adjustment and validation should be
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// done in initialize_flags(), which is called prior to
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// initialize_size_info().
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//
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// This class is not fully developed yet. As more collector(s)
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// are added, it is expected that we will come across further
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// behavior that requires global attention. The correct place
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// to deal with those issues is this class.
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// Forward declarations.
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class GenCollectorPolicy;
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class TwoGenerationCollectorPolicy;
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class AdaptiveSizePolicy;
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#ifndef SERIALGC
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class ConcurrentMarkSweepPolicy;
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class G1CollectorPolicy;
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#endif // SERIALGC
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class GCPolicyCounters;
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class MarkSweepPolicy;
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class CollectorPolicy : public CHeapObj<mtGC> {
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  GCPolicyCounters* _gc_policy_counters;
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  // Requires that the concrete subclass sets the alignment constraints
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  // before calling.
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  virtual void initialize_flags();
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  virtual void initialize_size_info();
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  size_t _initial_heap_byte_size;
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  size_t _max_heap_byte_size;
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  size_t _min_heap_byte_size;
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  size_t _min_alignment;
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  size_t _max_alignment;
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  // The sizing of the heap are controlled by a sizing policy.
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  AdaptiveSizePolicy* _size_policy;
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  // Set to true when policy wants soft refs cleared.
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  // Reset to false by gc after it clears all soft refs.
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  bool _should_clear_all_soft_refs;
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  // Set to true by the GC if the just-completed gc cleared all
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  // softrefs.  This is set to true whenever a gc clears all softrefs, and
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  // set to false each time gc returns to the mutator.  For example, in the
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  // ParallelScavengeHeap case the latter would be done toward the end of
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  // mem_allocate() where it returns op.result()
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  bool _all_soft_refs_clear;
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  CollectorPolicy() :
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    _min_alignment(1),
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    _max_alignment(1),
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    _initial_heap_byte_size(0),
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    _max_heap_byte_size(0),
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    _min_heap_byte_size(0),
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    _size_policy(NULL),
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    _should_clear_all_soft_refs(false),
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    _all_soft_refs_clear(false)
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  {}
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 public:
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  void set_min_alignment(size_t align)         { _min_alignment = align; }
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  size_t min_alignment()                       { return _min_alignment; }
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  void set_max_alignment(size_t align)         { _max_alignment = align; }
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  size_t max_alignment()                       { return _max_alignment; }
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  size_t initial_heap_byte_size() { return _initial_heap_byte_size; }
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  void set_initial_heap_byte_size(size_t v) { _initial_heap_byte_size = v; }
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  size_t max_heap_byte_size()     { return _max_heap_byte_size; }
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  void set_max_heap_byte_size(size_t v) { _max_heap_byte_size = v; }
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  size_t min_heap_byte_size()     { return _min_heap_byte_size; }
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  void set_min_heap_byte_size(size_t v) { _min_heap_byte_size = v; }
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  enum Name {
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    CollectorPolicyKind,
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    TwoGenerationCollectorPolicyKind,
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    ConcurrentMarkSweepPolicyKind,
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    ASConcurrentMarkSweepPolicyKind,
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    G1CollectorPolicyKind
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  };
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  AdaptiveSizePolicy* size_policy() { return _size_policy; }
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  bool should_clear_all_soft_refs() { return _should_clear_all_soft_refs; }
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  void set_should_clear_all_soft_refs(bool v) { _should_clear_all_soft_refs = v; }
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  // Returns the current value of _should_clear_all_soft_refs.
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  // _should_clear_all_soft_refs is set to false as a side effect.
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  bool use_should_clear_all_soft_refs(bool v);
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  bool all_soft_refs_clear() { return _all_soft_refs_clear; }
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  void set_all_soft_refs_clear(bool v) { _all_soft_refs_clear = v; }
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  // Called by the GC after Soft Refs have been cleared to indicate
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  // that the request in _should_clear_all_soft_refs has been fulfilled.
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  void cleared_all_soft_refs();
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  // Identification methods.
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  virtual GenCollectorPolicy*           as_generation_policy()            { return NULL; }
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  virtual TwoGenerationCollectorPolicy* as_two_generation_policy()        { return NULL; }
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  virtual MarkSweepPolicy*              as_mark_sweep_policy()            { return NULL; }
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#ifndef SERIALGC
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  virtual ConcurrentMarkSweepPolicy*    as_concurrent_mark_sweep_policy() { return NULL; }
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  virtual G1CollectorPolicy*            as_g1_policy()                    { return NULL; }
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#endif // SERIALGC
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  // Note that these are not virtual.
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  bool is_generation_policy()            { return as_generation_policy() != NULL; }
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  bool is_two_generation_policy()        { return as_two_generation_policy() != NULL; }
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  bool is_mark_sweep_policy()            { return as_mark_sweep_policy() != NULL; }
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#ifndef SERIALGC
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  bool is_concurrent_mark_sweep_policy() { return as_concurrent_mark_sweep_policy() != NULL; }
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  bool is_g1_policy()                    { return as_g1_policy() != NULL; }
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#else  // SERIALGC
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  bool is_concurrent_mark_sweep_policy() { return false; }
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  bool is_g1_policy()                    { return false; }
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#endif // SERIALGC
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  virtual BarrierSet::Name barrier_set_name() = 0;
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  virtual GenRemSet::Name  rem_set_name() = 0;
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  // Create the remembered set (to cover the given reserved region,
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  // allowing breaking up into at most "max_covered_regions").
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  virtual GenRemSet* create_rem_set(MemRegion reserved,
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                                    int max_covered_regions);
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  // This method controls how a collector satisfies a request
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  // for a block of memory.  "gc_time_limit_was_exceeded" will
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  // be set to true if the adaptive size policy determine that
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  // an excessive amount of time is being spent doing collections
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  // and caused a NULL to be returned.  If a NULL is not returned,
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  // "gc_time_limit_was_exceeded" has an undefined meaning.
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  virtual HeapWord* mem_allocate_work(size_t size,
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                                      bool is_tlab,
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                                      bool* gc_overhead_limit_was_exceeded) = 0;
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  // This method controls how a collector handles one or more
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  // of its generations being fully allocated.
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  virtual HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab) = 0;
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  // This method controls how a collector handles a metadata allocation
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  // failure.
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  virtual MetaWord* satisfy_failed_metadata_allocation(ClassLoaderData* loader_data,
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                                                       size_t size,
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                                                       Metaspace::MetadataType mdtype);
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  // Performace Counter support
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  GCPolicyCounters* counters()     { return _gc_policy_counters; }
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  // Create the jstat counters for the GC policy.  By default, policy's
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  // don't have associated counters, and we complain if this is invoked.
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  virtual void initialize_gc_policy_counters() {
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    ShouldNotReachHere();
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  }
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  virtual CollectorPolicy::Name kind() {
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    return CollectorPolicy::CollectorPolicyKind;
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  }
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  // Returns true if a collector has eden space with soft end.
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  virtual bool has_soft_ended_eden() {
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    return false;
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  }
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};
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class ClearedAllSoftRefs : public StackObj {
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  bool _clear_all_soft_refs;
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  CollectorPolicy* _collector_policy;
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 public:
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  ClearedAllSoftRefs(bool clear_all_soft_refs,
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                     CollectorPolicy* collector_policy) :
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    _clear_all_soft_refs(clear_all_soft_refs),
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    _collector_policy(collector_policy) {}
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  ~ClearedAllSoftRefs() {
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    if (_clear_all_soft_refs) {
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      _collector_policy->cleared_all_soft_refs();
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    }
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  }
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};
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class GenCollectorPolicy : public CollectorPolicy {
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  size_t _min_gen0_size;
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  size_t _initial_gen0_size;
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  size_t _max_gen0_size;
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  GenerationSpec **_generations;
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  // Return true if an allocation should be attempted in the older
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  // generation if it fails in the younger generation.  Return
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  // false, otherwise.
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  virtual bool should_try_older_generation_allocation(size_t word_size) const;
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  void initialize_flags();
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  void initialize_size_info();
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  // Try to allocate space by expanding the heap.
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  virtual HeapWord* expand_heap_and_allocate(size_t size, bool is_tlab);
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  // compute max heap alignment
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  size_t compute_max_alignment();
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 // Scale the base_size by NewRation according to
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 //     result = base_size / (NewRatio + 1)
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 // and align by min_alignment()
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 size_t scale_by_NewRatio_aligned(size_t base_size);
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 // Bound the value by the given maximum minus the
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 // min_alignment.
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 size_t bound_minus_alignment(size_t desired_size, size_t maximum_size);
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  // Accessors
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  size_t min_gen0_size() { return _min_gen0_size; }
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  void set_min_gen0_size(size_t v) { _min_gen0_size = v; }
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  size_t initial_gen0_size() { return _initial_gen0_size; }
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  void set_initial_gen0_size(size_t v) { _initial_gen0_size = v; }
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  size_t max_gen0_size() { return _max_gen0_size; }
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  void set_max_gen0_size(size_t v) { _max_gen0_size = v; }
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  virtual int number_of_generations() = 0;
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  virtual GenerationSpec **generations()       {
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    assert(_generations != NULL, "Sanity check");
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    return _generations;
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  }
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  virtual GenCollectorPolicy* as_generation_policy() { return this; }
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  virtual void initialize_generations() = 0;
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  virtual void initialize_all() {
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    initialize_flags();
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    initialize_size_info();
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    initialize_generations();
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  }
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  HeapWord* mem_allocate_work(size_t size,
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                              bool is_tlab,
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                              bool* gc_overhead_limit_was_exceeded);
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  HeapWord *satisfy_failed_allocation(size_t size, bool is_tlab);
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  // Adaptive size policy
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  virtual void initialize_size_policy(size_t init_eden_size,
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                                      size_t init_promo_size,
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                                      size_t init_survivor_size);
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};
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// All of hotspot's current collectors are subtypes of this
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// class. Currently, these collectors all use the same gen[0],
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// but have different gen[1] types. If we add another subtype
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// of CollectorPolicy, this class should be broken out into
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// its own file.
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class TwoGenerationCollectorPolicy : public GenCollectorPolicy {
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 protected:
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  size_t _min_gen1_size;
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  size_t _initial_gen1_size;
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  size_t _max_gen1_size;
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  void initialize_flags();
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  void initialize_size_info();
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  void initialize_generations()                { ShouldNotReachHere(); }
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  // Accessors
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  size_t min_gen1_size() { return _min_gen1_size; }
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  void set_min_gen1_size(size_t v) { _min_gen1_size = v; }
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  size_t initial_gen1_size() { return _initial_gen1_size; }
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  void set_initial_gen1_size(size_t v) { _initial_gen1_size = v; }
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  size_t max_gen1_size() { return _max_gen1_size; }
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  void set_max_gen1_size(size_t v) { _max_gen1_size = v; }
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  // Inherited methods
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  TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; }
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  int number_of_generations()                  { return 2; }
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  BarrierSet::Name barrier_set_name()          { return BarrierSet::CardTableModRef; }
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  GenRemSet::Name rem_set_name()               { return GenRemSet::CardTable; }
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  virtual CollectorPolicy::Name kind() {
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    return CollectorPolicy::TwoGenerationCollectorPolicyKind;
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  }
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  // Returns true is gen0 sizes were adjusted
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  bool adjust_gen0_sizes(size_t* gen0_size_ptr, size_t* gen1_size_ptr,
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                               size_t heap_size, size_t min_gen1_size);
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};
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class MarkSweepPolicy : public TwoGenerationCollectorPolicy {
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 protected:
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  void initialize_generations();
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 public:
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  MarkSweepPolicy();
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  MarkSweepPolicy* as_mark_sweep_policy() { return this; }
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  void initialize_gc_policy_counters();
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};
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#endif // SHARE_VM_MEMORY_COLLECTORPOLICY_HPP