jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1ParScanThreadState.hpp@7df07d855c8e (annotated)

src/share/vm/gc_implementation/g1/g1ParScanThreadState.hpp@7df07d855c8e (annotated)

src/share/vm/gc_implementation/g1/g1ParScanThreadState.hpp

Mon, 21 Jul 2014 09:59:46 +0200

author: tschatzl
date: Mon, 21 Jul 2014 09:59:46 +0200
changeset 7007: 7df07d855c8e
parent 6938: a2328cbebb23
child 7118: 227a9e5e4b4a
permissions: -rw-r--r--

8048085: Aborting marking just before remark results in useless additional clearing of the next mark bitmap
Summary: Skip clearing the next bitmap if we just recently aborted since the full GC already clears this bitmap.
Reviewed-by: brutisso

 /*
  * Copyright (c) 2014, 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_G1_G1PARSCANTHREADSTATE_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_HPP
 #include "gc_implementation/g1/dirtyCardQueue.hpp"
 #include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
 #include "gc_implementation/g1/g1CollectedHeap.hpp"
 #include "gc_implementation/g1/g1CollectorPolicy.hpp"
 #include "gc_implementation/g1/g1OopClosures.hpp"
 #include "gc_implementation/g1/g1RemSet.hpp"
 #include "gc_implementation/shared/ageTable.hpp"
 #include "memory/allocation.hpp"
 #include "oops/oop.hpp"
 class HeapRegion;
 class outputStream;
 class G1ParScanThreadState : public StackObj {
  private:
   G1CollectedHeap* _g1h;
   RefToScanQueue*  _refs;
   DirtyCardQueue   _dcq;
   G1SATBCardTableModRefBS* _ct_bs;
   G1RemSet* _g1_rem;
   G1ParGCAllocBuffer  _surviving_alloc_buffer;
   G1ParGCAllocBuffer  _tenured_alloc_buffer;
   G1ParGCAllocBuffer* _alloc_buffers[GCAllocPurposeCount];
   ageTable            _age_table;
   G1ParScanClosure    _scanner;
   size_t           _alloc_buffer_waste;
   size_t           _undo_waste;
   OopsInHeapRegionClosure*      _evac_failure_cl;
   int  _hash_seed;
   uint _queue_num;
   size_t _term_attempts;
   double _start;
   double _start_strong_roots;
   double _strong_roots_time;
   double _start_term;
   double _term_time;
   // Map from young-age-index (0 == not young, 1 is youngest) to
   // surviving words. base is what we get back from the malloc call
   size_t* _surviving_young_words_base;
   // this points into the array, as we use the first few entries for padding
   size_t* _surviving_young_words;
 #define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t))
   void   add_to_alloc_buffer_waste(size_t waste) { _alloc_buffer_waste += waste; }
   void   add_to_undo_waste(size_t waste)         { _undo_waste += waste; }
   DirtyCardQueue& dirty_card_queue()             { return _dcq;  }
   G1SATBCardTableModRefBS* ctbs()                { return _ct_bs; }
   template <class T> inline void immediate_rs_update(HeapRegion* from, T* p, int tid);
   template <class T> void deferred_rs_update(HeapRegion* from, T* p, int tid) {
     // If the new value of the field points to the same region or
     // is the to-space, we don't need to include it in the Rset updates.
     if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) {
       size_t card_index = ctbs()->index_for(p);
       // If the card hasn't been added to the buffer, do it.
       if (ctbs()->mark_card_deferred(card_index)) {
         dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index));
       }
     }
   }
  public:
   G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num, ReferenceProcessor* rp);
   ~G1ParScanThreadState();
   ageTable*         age_table()       { return &_age_table;       }
   G1ParGCAllocBuffer* alloc_buffer(GCAllocPurpose purpose) {
     return _alloc_buffers[purpose];
   }
   size_t alloc_buffer_waste() const              { return _alloc_buffer_waste; }
   size_t undo_waste() const                      { return _undo_waste; }
 #ifdef ASSERT
   bool queue_is_empty() const { return _refs->is_empty(); }
   bool verify_ref(narrowOop* ref) const;
   bool verify_ref(oop* ref) const;
   bool verify_task(StarTask ref) const;
 #endif // ASSERT
   template <class T> void push_on_queue(T* ref) {
     assert(verify_ref(ref), "sanity");
     _refs->push(ref);
   }
   template <class T> inline void update_rs(HeapRegion* from, T* p, int tid);
  private:
   inline HeapWord* allocate(GCAllocPurpose purpose, size_t word_sz);
   inline HeapWord* allocate_slow(GCAllocPurpose purpose, size_t word_sz);
   inline void undo_allocation(GCAllocPurpose purpose, HeapWord* obj, size_t word_sz);
  public:
   void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) {
     _evac_failure_cl = evac_failure_cl;
   }
   OopsInHeapRegionClosure* evac_failure_closure() { return _evac_failure_cl; }
   int* hash_seed() { return &_hash_seed; }
   uint queue_num() { return _queue_num; }
   size_t term_attempts() const  { return _term_attempts; }
   void note_term_attempt() { _term_attempts++; }
   void start_strong_roots() {
     _start_strong_roots = os::elapsedTime();
   }
   void end_strong_roots() {
     _strong_roots_time += (os::elapsedTime() - _start_strong_roots);
   }
   double strong_roots_time() const { return _strong_roots_time; }
   void start_term_time() {
     note_term_attempt();
     _start_term = os::elapsedTime();
   }
   void end_term_time() {
     _term_time += (os::elapsedTime() - _start_term);
   }
   double term_time() const { return _term_time; }
   double elapsed_time() const {
     return os::elapsedTime() - _start;
   }
   static void print_termination_stats_hdr(outputStream* const st = gclog_or_tty);
   void print_termination_stats(int i, outputStream* const st = gclog_or_tty) const;
   size_t* surviving_young_words() {
     // We add on to hide entry 0 which accumulates surviving words for
     // age -1 regions (i.e. non-young ones)
     return _surviving_young_words;
   }
  private:
   void retire_alloc_buffers();
   #define G1_PARTIAL_ARRAY_MASK 0x2
   inline bool has_partial_array_mask(oop* ref) const {
     return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
   }
   // We never encode partial array oops as narrowOop*, so return false immediately.
   // This allows the compiler to create optimized code when popping references from
   // the work queue.
   inline bool has_partial_array_mask(narrowOop* ref) const {
     assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*");
     return false;
   }
   // Only implement set_partial_array_mask() for regular oops, not for narrowOops.
   // We always encode partial arrays as regular oop, to allow the
   // specialization for has_partial_array_mask() for narrowOops above.
   // This means that unintentional use of this method with narrowOops are caught
   // by the compiler.
   inline oop* set_partial_array_mask(oop obj) const {
     assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
     return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK);
   }
   inline oop clear_partial_array_mask(oop* ref) const {
     return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
   }
   inline void do_oop_partial_array(oop* p);
   // This method is applied to the fields of the objects that have just been copied.
   template <class T> inline void do_oop_evac(T* p, HeapRegion* from);
   template <class T> inline void deal_with_reference(T* ref_to_scan);
   inline void dispatch_reference(StarTask ref);
  public:
   oop copy_to_survivor_space(oop const obj);
   void trim_queue();
   inline void steal_and_trim_queue(RefToScanQueueSet *task_queues);
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1ParScanThreadState.hpp@7df07d855c8e (annotated)

src/share/vm/gc_implementation/g1/g1ParScanThreadState.hpp