hotspot/src/share/vm/gc_implementation/g1/g1ParScanThreadState.hpp
author stefank
Tue, 28 Apr 2015 12:17:56 +0000
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parent 30566 18eb9aa972d0
permissions -rw-r--r--
Merge
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/*
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 * Copyright (c) 2014, 2015, 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_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_HPP
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#define SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_HPP
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#include "gc_implementation/g1/dirtyCardQueue.hpp"
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#include "gc_implementation/g1/g1SATBCardTableModRefBS.hpp"
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#include "gc_implementation/g1/g1CollectedHeap.hpp"
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#include "gc_implementation/g1/g1CollectorPolicy.hpp"
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#include "gc_implementation/g1/g1OopClosures.hpp"
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#include "gc_implementation/g1/g1RemSet.hpp"
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#include "gc_implementation/shared/ageTable.hpp"
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#include "memory/allocation.hpp"
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#include "oops/oop.hpp"
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class HeapRegion;
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class outputStream;
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class G1ParScanThreadState : public StackObj {
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 private:
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  G1CollectedHeap* _g1h;
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  RefToScanQueue*  _refs;
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  DirtyCardQueue   _dcq;
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  G1SATBCardTableModRefBS* _ct_bs;
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  G1RemSet* _g1_rem;
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  G1ParGCAllocator* _g1_par_allocator;
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  ageTable          _age_table;
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  InCSetState       _dest[InCSetState::Num];
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  // Local tenuring threshold.
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  uint              _tenuring_threshold;
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  G1ParScanClosure  _scanner;
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  OopsInHeapRegionClosure*      _evac_failure_cl;
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  int  _hash_seed;
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  uint _queue_num;
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  size_t _term_attempts;
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  double _start;
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  double _start_strong_roots;
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  double _strong_roots_time;
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  double _start_term;
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  double _term_time;
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  // Map from young-age-index (0 == not young, 1 is youngest) to
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  // surviving words. base is what we get back from the malloc call
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  size_t* _surviving_young_words_base;
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  // this points into the array, as we use the first few entries for padding
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  size_t* _surviving_young_words;
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#define PADDING_ELEM_NUM (DEFAULT_CACHE_LINE_SIZE / sizeof(size_t))
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  DirtyCardQueue& dirty_card_queue()             { return _dcq;  }
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  G1SATBCardTableModRefBS* ctbs()                { return _ct_bs; }
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  InCSetState dest(InCSetState original) const {
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    assert(original.is_valid(),
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           err_msg("Original state invalid: " CSETSTATE_FORMAT, original.value()));
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    assert(_dest[original.value()].is_valid_gen(),
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           err_msg("Dest state is invalid: " CSETSTATE_FORMAT, _dest[original.value()].value()));
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    return _dest[original.value()];
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  }
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 public:
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  G1ParScanThreadState(G1CollectedHeap* g1h, uint queue_num, ReferenceProcessor* rp);
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  ~G1ParScanThreadState();
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  ageTable*         age_table()       { return &_age_table;       }
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#ifdef ASSERT
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  bool queue_is_empty() const { return _refs->is_empty(); }
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  bool verify_ref(narrowOop* ref) const;
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  bool verify_ref(oop* ref) const;
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  bool verify_task(StarTask ref) const;
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#endif // ASSERT
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  template <class T> void push_on_queue(T* ref);
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  template <class T> void update_rs(HeapRegion* from, T* p, uint tid) {
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    // If the new value of the field points to the same region or
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    // is the to-space, we don't need to include it in the Rset updates.
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    if (!from->is_in_reserved(oopDesc::load_decode_heap_oop(p)) && !from->is_survivor()) {
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      size_t card_index = ctbs()->index_for(p);
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      // If the card hasn't been added to the buffer, do it.
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      if (ctbs()->mark_card_deferred(card_index)) {
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        dirty_card_queue().enqueue((jbyte*)ctbs()->byte_for_index(card_index));
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      }
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    }
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  }
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  void set_evac_failure_closure(OopsInHeapRegionClosure* evac_failure_cl) {
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    _evac_failure_cl = evac_failure_cl;
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  }
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  OopsInHeapRegionClosure* evac_failure_closure() { return _evac_failure_cl; }
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  int* hash_seed() { return &_hash_seed; }
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  uint queue_num() { return _queue_num; }
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  size_t term_attempts() const  { return _term_attempts; }
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  void note_term_attempt() { _term_attempts++; }
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  void start_strong_roots() {
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    _start_strong_roots = os::elapsedTime();
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  }
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  void end_strong_roots() {
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    _strong_roots_time += (os::elapsedTime() - _start_strong_roots);
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  }
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  double strong_roots_time() const { return _strong_roots_time; }
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  void start_term_time() {
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    note_term_attempt();
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    _start_term = os::elapsedTime();
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  }
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  void end_term_time() {
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    _term_time += (os::elapsedTime() - _start_term);
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  }
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  double term_time() const { return _term_time; }
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  double elapsed_time() const {
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    return os::elapsedTime() - _start;
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  }
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  static void print_termination_stats_hdr(outputStream* const st = gclog_or_tty);
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  void print_termination_stats(int i, outputStream* const st = gclog_or_tty) const;
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  size_t* surviving_young_words() {
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    // We add on to hide entry 0 which accumulates surviving words for
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    // age -1 regions (i.e. non-young ones)
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    return _surviving_young_words;
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  }
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 private:
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  #define G1_PARTIAL_ARRAY_MASK 0x2
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  inline bool has_partial_array_mask(oop* ref) const {
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    return ((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) == G1_PARTIAL_ARRAY_MASK;
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  }
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  // We never encode partial array oops as narrowOop*, so return false immediately.
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  // This allows the compiler to create optimized code when popping references from
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  // the work queue.
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  inline bool has_partial_array_mask(narrowOop* ref) const {
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    assert(((uintptr_t)ref & G1_PARTIAL_ARRAY_MASK) != G1_PARTIAL_ARRAY_MASK, "Partial array oop reference encoded as narrowOop*");
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    return false;
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  }
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  // Only implement set_partial_array_mask() for regular oops, not for narrowOops.
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  // We always encode partial arrays as regular oop, to allow the
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  // specialization for has_partial_array_mask() for narrowOops above.
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  // This means that unintentional use of this method with narrowOops are caught
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  // by the compiler.
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  inline oop* set_partial_array_mask(oop obj) const {
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    assert(((uintptr_t)(void *)obj & G1_PARTIAL_ARRAY_MASK) == 0, "Information loss!");
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    return (oop*) ((uintptr_t)(void *)obj | G1_PARTIAL_ARRAY_MASK);
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  }
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  inline oop clear_partial_array_mask(oop* ref) const {
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    return cast_to_oop((intptr_t)ref & ~G1_PARTIAL_ARRAY_MASK);
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  }
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  inline void do_oop_partial_array(oop* p);
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  // This method is applied to the fields of the objects that have just been copied.
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  template <class T> inline void do_oop_evac(T* p, HeapRegion* from);
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  template <class T> inline void deal_with_reference(T* ref_to_scan);
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  inline void dispatch_reference(StarTask ref);
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  // Tries to allocate word_sz in the PLAB of the next "generation" after trying to
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  // allocate into dest. State is the original (source) cset state for the object
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  // that is allocated for.
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  // Returns a non-NULL pointer if successful, and updates dest if required.
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  HeapWord* allocate_in_next_plab(InCSetState const state,
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                                  InCSetState* dest,
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                                  size_t word_sz,
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                                  AllocationContext_t const context);
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  inline InCSetState next_state(InCSetState const state, markOop const m, uint& age);
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 public:
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  oop copy_to_survivor_space(InCSetState const state, oop const obj, markOop const old_mark);
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  void trim_queue();
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  inline void steal_and_trim_queue(RefToScanQueueSet *task_queues);
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};
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1PARSCANTHREADSTATE_HPP