| /* |
| * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_PARALLEL_PARALLELSCAVENGEHEAP_HPP |
| #define SHARE_VM_GC_PARALLEL_PARALLELSCAVENGEHEAP_HPP |
| |
| #include "gc/parallel/generationSizer.hpp" |
| #include "gc/parallel/objectStartArray.hpp" |
| #include "gc/parallel/psGCAdaptivePolicyCounters.hpp" |
| #include "gc/parallel/psOldGen.hpp" |
| #include "gc/parallel/psYoungGen.hpp" |
| #include "gc/shared/collectedHeap.hpp" |
| #include "gc/shared/collectorPolicy.hpp" |
| #include "gc/shared/gcPolicyCounters.hpp" |
| #include "gc/shared/gcWhen.hpp" |
| #include "gc/shared/strongRootsScope.hpp" |
| #include "memory/metaspace.hpp" |
| #include "utilities/ostream.hpp" |
| |
| class AdjoiningGenerations; |
| class GCHeapSummary; |
| class GCTaskManager; |
| class PSAdaptiveSizePolicy; |
| class PSHeapSummary; |
| |
| class ParallelScavengeHeap : public CollectedHeap { |
| friend class VMStructs; |
| private: |
| static PSYoungGen* _young_gen; |
| static PSOldGen* _old_gen; |
| |
| // Sizing policy for entire heap |
| static PSAdaptiveSizePolicy* _size_policy; |
| static PSGCAdaptivePolicyCounters* _gc_policy_counters; |
| |
| GenerationSizer* _collector_policy; |
| |
| // Collection of generations that are adjacent in the |
| // space reserved for the heap. |
| AdjoiningGenerations* _gens; |
| unsigned int _death_march_count; |
| |
| // The task manager |
| static GCTaskManager* _gc_task_manager; |
| |
| void trace_heap(GCWhen::Type when, const GCTracer* tracer); |
| |
| protected: |
| static inline size_t total_invocations(); |
| HeapWord* allocate_new_tlab(size_t size); |
| |
| inline bool should_alloc_in_eden(size_t size) const; |
| inline void death_march_check(HeapWord* const result, size_t size); |
| HeapWord* mem_allocate_old_gen(size_t size); |
| |
| public: |
| ParallelScavengeHeap(GenerationSizer* policy) : |
| CollectedHeap(), _collector_policy(policy), _death_march_count(0) { } |
| |
| // For use by VM operations |
| enum CollectionType { |
| Scavenge, |
| MarkSweep |
| }; |
| |
| virtual Name kind() const { |
| return CollectedHeap::ParallelScavengeHeap; |
| } |
| |
| virtual const char* name() const { |
| return "Parallel"; |
| } |
| |
| virtual CollectorPolicy* collector_policy() const { return _collector_policy; } |
| |
| static PSYoungGen* young_gen() { return _young_gen; } |
| static PSOldGen* old_gen() { return _old_gen; } |
| |
| virtual PSAdaptiveSizePolicy* size_policy() { return _size_policy; } |
| |
| static PSGCAdaptivePolicyCounters* gc_policy_counters() { return _gc_policy_counters; } |
| |
| static ParallelScavengeHeap* heap(); |
| |
| static GCTaskManager* const gc_task_manager() { return _gc_task_manager; } |
| |
| AdjoiningGenerations* gens() { return _gens; } |
| |
| // Returns JNI_OK on success |
| virtual jint initialize(); |
| |
| void post_initialize(); |
| void update_counters(); |
| |
| // The alignment used for the various areas |
| size_t space_alignment() { return _collector_policy->space_alignment(); } |
| size_t generation_alignment() { return _collector_policy->gen_alignment(); } |
| |
| // Return the (conservative) maximum heap alignment |
| static size_t conservative_max_heap_alignment() { |
| return CollectorPolicy::compute_heap_alignment(); |
| } |
| |
| size_t capacity() const; |
| size_t used() const; |
| |
| // Return "true" if all generations have reached the |
| // maximal committed limit that they can reach, without a garbage |
| // collection. |
| virtual bool is_maximal_no_gc() const; |
| |
| // Return true if the reference points to an object that |
| // can be moved in a partial collection. For currently implemented |
| // generational collectors that means during a collection of |
| // the young gen. |
| virtual bool is_scavengable(const void* addr); |
| |
| size_t max_capacity() const; |
| |
| // Whether p is in the allocated part of the heap |
| bool is_in(const void* p) const; |
| |
| bool is_in_reserved(const void* p) const; |
| |
| bool is_in_young(oop p); // reserved part |
| bool is_in_old(oop p); // reserved part |
| |
| // Memory allocation. "gc_time_limit_was_exceeded" will |
| // be set to true if the adaptive size policy determine that |
| // an excessive amount of time is being spent doing collections |
| // and caused a NULL to be returned. If a NULL is not returned, |
| // "gc_time_limit_was_exceeded" has an undefined meaning. |
| HeapWord* mem_allocate(size_t size, bool* gc_overhead_limit_was_exceeded); |
| |
| // Allocation attempt(s) during a safepoint. It should never be called |
| // to allocate a new TLAB as this allocation might be satisfied out |
| // of the old generation. |
| HeapWord* failed_mem_allocate(size_t size); |
| |
| // Support for System.gc() |
| void collect(GCCause::Cause cause); |
| |
| // These also should be called by the vm thread at a safepoint (e.g., from a |
| // VM operation). |
| // |
| // The first collects the young generation only, unless the scavenge fails; it |
| // will then attempt a full gc. The second collects the entire heap; if |
| // maximum_compaction is true, it will compact everything and clear all soft |
| // references. |
| inline void invoke_scavenge(); |
| |
| // Perform a full collection |
| virtual void do_full_collection(bool clear_all_soft_refs); |
| |
| bool supports_inline_contig_alloc() const { return !UseNUMA; } |
| |
| HeapWord* volatile* top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord* volatile*)-1; } |
| HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; } |
| |
| void ensure_parsability(bool retire_tlabs); |
| void accumulate_statistics_all_tlabs(); |
| void resize_all_tlabs(); |
| |
| bool supports_tlab_allocation() const { return true; } |
| |
| size_t tlab_capacity(Thread* thr) const; |
| size_t tlab_used(Thread* thr) const; |
| size_t unsafe_max_tlab_alloc(Thread* thr) const; |
| |
| // Can a compiler initialize a new object without store barriers? |
| // This permission only extends from the creation of a new object |
| // via a TLAB up to the first subsequent safepoint. |
| virtual bool can_elide_tlab_store_barriers() const { |
| return true; |
| } |
| |
| virtual bool card_mark_must_follow_store() const { |
| return false; |
| } |
| |
| // Return true if we don't we need a store barrier for |
| // initializing stores to an object at this address. |
| virtual bool can_elide_initializing_store_barrier(oop new_obj); |
| |
| void object_iterate(ObjectClosure* cl); |
| void safe_object_iterate(ObjectClosure* cl) { object_iterate(cl); } |
| |
| HeapWord* block_start(const void* addr) const; |
| size_t block_size(const HeapWord* addr) const; |
| bool block_is_obj(const HeapWord* addr) const; |
| |
| jlong millis_since_last_gc(); |
| |
| void prepare_for_verify(); |
| PSHeapSummary create_ps_heap_summary(); |
| virtual void print_on(outputStream* st) const; |
| virtual void print_on_error(outputStream* st) const; |
| virtual void print_gc_threads_on(outputStream* st) const; |
| virtual void gc_threads_do(ThreadClosure* tc) const; |
| virtual void print_tracing_info() const; |
| |
| void verify(VerifyOption option /* ignored */); |
| |
| // Resize the young generation. The reserved space for the |
| // generation may be expanded in preparation for the resize. |
| void resize_young_gen(size_t eden_size, size_t survivor_size); |
| |
| // Resize the old generation. The reserved space for the |
| // generation may be expanded in preparation for the resize. |
| void resize_old_gen(size_t desired_free_space); |
| |
| // Save the tops of the spaces in all generations |
| void record_gen_tops_before_GC() PRODUCT_RETURN; |
| |
| // Mangle the unused parts of all spaces in the heap |
| void gen_mangle_unused_area() PRODUCT_RETURN; |
| |
| // Call these in sequential code around the processing of strong roots. |
| class ParStrongRootsScope : public MarkScope { |
| public: |
| ParStrongRootsScope(); |
| ~ParStrongRootsScope(); |
| }; |
| }; |
| |
| // Simple class for storing info about the heap at the start of GC, to be used |
| // after GC for comparison/printing. |
| class PreGCValues { |
| public: |
| PreGCValues(ParallelScavengeHeap* heap) : |
| _heap_used(heap->used()), |
| _young_gen_used(heap->young_gen()->used_in_bytes()), |
| _old_gen_used(heap->old_gen()->used_in_bytes()), |
| _metadata_used(MetaspaceAux::used_bytes()) { }; |
| |
| size_t heap_used() const { return _heap_used; } |
| size_t young_gen_used() const { return _young_gen_used; } |
| size_t old_gen_used() const { return _old_gen_used; } |
| size_t metadata_used() const { return _metadata_used; } |
| |
| private: |
| size_t _heap_used; |
| size_t _young_gen_used; |
| size_t _old_gen_used; |
| size_t _metadata_used; |
| }; |
| |
| // Class that can be used to print information about the |
| // adaptive size policy at intervals specified by |
| // AdaptiveSizePolicyOutputInterval. Only print information |
| // if an adaptive size policy is in use. |
| class AdaptiveSizePolicyOutput : AllStatic { |
| static bool enabled() { |
| return UseParallelGC && |
| UseAdaptiveSizePolicy && |
| log_is_enabled(Debug, gc, ergo); |
| } |
| public: |
| static void print() { |
| if (enabled()) { |
| ParallelScavengeHeap::heap()->size_policy()->print(); |
| } |
| } |
| |
| static void print(AdaptiveSizePolicy* size_policy, uint count) { |
| bool do_print = |
| enabled() && |
| (AdaptiveSizePolicyOutputInterval > 0) && |
| (count % AdaptiveSizePolicyOutputInterval) == 0; |
| |
| if (do_print) { |
| size_policy->print(); |
| } |
| } |
| }; |
| |
| #endif // SHARE_VM_GC_PARALLEL_PARALLELSCAVENGEHEAP_HPP |