jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 2001, 2013, 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_IMPLEMENTATION_PARALLELSCAVENGE_PARALLELSCAVENGEHEAP_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARALLELSCAVENGEHEAP_HPP
 #include "gc_implementation/parallelScavenge/generationSizer.hpp"
 #include "gc_implementation/parallelScavenge/objectStartArray.hpp"
 #include "gc_implementation/parallelScavenge/psGCAdaptivePolicyCounters.hpp"
 #include "gc_implementation/parallelScavenge/psOldGen.hpp"
 #include "gc_implementation/parallelScavenge/psYoungGen.hpp"
 #include "gc_implementation/shared/gcPolicyCounters.hpp"
 #include "gc_implementation/shared/gcWhen.hpp"
 #include "gc_interface/collectedHeap.inline.hpp"
 #include "memory/collectorPolicy.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;
   static ParallelScavengeHeap* _psh;
   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, 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() : CollectedHeap(), _death_march_count(0) { }
   // For use by VM operations
   enum CollectionType {
     Scavenge,
     MarkSweep
   };
   ParallelScavengeHeap::Name kind() const {
     return CollectedHeap::ParallelScavengeHeap;
   }
   virtual CollectorPolicy* collector_policy() const { return (CollectorPolicy*) _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);
   // Does this heap support heap inspection? (+PrintClassHistogram)
   bool supports_heap_inspection() const { return true; }
   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;
 #ifdef ASSERT
   virtual bool is_in_partial_collection(const void *p);
 #endif
   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** top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-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();
   size_t unsafe_max_alloc();
   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 oop_iterate(ExtendedOopClosure* cl);
   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(bool silent, VerifyOption option /* ignored */);
   void print_heap_change(size_t prev_used);
   // 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 MarkingCodeBlobClosure::MarkScope {
    public:
     ParStrongRootsScope();
     ~ParStrongRootsScope();
   };
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_PARALLELSCAVENGE_PARALLELSCAVENGEHEAP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp@f90c822e73f8 (annotated)

src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.hpp