author | jprovino |
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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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#include "utilities/macros.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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#if INCLUDE_ALL_GCS |
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class ConcurrentMarkSweepPolicy; |
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class G1CollectorPolicy; |
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#endif // INCLUDE_ALL_GCS |
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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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protected: |
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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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#if INCLUDE_ALL_GCS |
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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 // INCLUDE_ALL_GCS |
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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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#if INCLUDE_ALL_GCS |
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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 // INCLUDE_ALL_GCS |
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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 // INCLUDE_ALL_GCS |
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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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protected: |
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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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|
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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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public: |
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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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295 |
size_t _min_gen1_size; |
|
296 |
size_t _initial_gen1_size; |
|
297 |
size_t _max_gen1_size; |
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298 |
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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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public: |
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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 |
313 |
TwoGenerationCollectorPolicy* as_two_generation_policy() { return this; } |
|
314 |
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315 |
int number_of_generations() { return 2; } |
|
316 |
BarrierSet::Name barrier_set_name() { return BarrierSet::CardTableModRef; } |
|
317 |
GenRemSet::Name rem_set_name() { return GenRemSet::CardTable; } |
|
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319 |
virtual CollectorPolicy::Name kind() { |
|
320 |
return CollectorPolicy::TwoGenerationCollectorPolicyKind; |
|
321 |
} |
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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); |
1 | 326 |
}; |
327 |
||
328 |
class MarkSweepPolicy : public TwoGenerationCollectorPolicy { |
|
329 |
protected: |
|
330 |
void initialize_generations(); |
|
331 |
||
332 |
public: |
|
333 |
MarkSweepPolicy(); |
|
334 |
||
335 |
MarkSweepPolicy* as_mark_sweep_policy() { return this; } |
|
336 |
||
337 |
void initialize_gc_policy_counters(); |
|
338 |
}; |
|
7397 | 339 |
|
340 |
#endif // SHARE_VM_MEMORY_COLLECTORPOLICY_HPP |