jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/g1/g1CardCounts.hpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1CardCounts.hpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1CardCounts.hpp

Thu, 23 Oct 2014 12:02:08 -0700

author: asaha
date: Thu, 23 Oct 2014 12:02:08 -0700
changeset 7476: c2844108a708
parent 7257: e7d0505c8a30
child 7535: 7ae4e26cb1e0
child 9327: f96fcd9e1e1b
permissions: -rw-r--r--

Merge

 /*
  * Copyright (c) 2013, 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_G1CARDCOUNTS_HPP
 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP
 #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
 #include "memory/allocation.hpp"
 #include "runtime/virtualspace.hpp"
 #include "utilities/globalDefinitions.hpp"
 class CardTableModRefBS;
 class G1CardCounts;
 class G1CollectedHeap;
 class G1RegionToSpaceMapper;
 class HeapRegion;
 class G1CardCountsMappingChangedListener : public G1MappingChangedListener {
  private:
   G1CardCounts* _counts;
  public:
   void set_cardcounts(G1CardCounts* counts) { _counts = counts; }
   virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled);
 };
 // Table to track the number of times a card has been refined. Once
 // a card has been refined a certain number of times, it is
 // considered 'hot' and its refinement is delayed by inserting the
 // card into the hot card cache. The card will then be refined when
 // it is evicted from the hot card cache, or when the hot card cache
 // is 'drained' during the next evacuation pause.
 class G1CardCounts: public CHeapObj<mtGC> {
   G1CardCountsMappingChangedListener _listener;
   G1CollectedHeap* _g1h;
   // The table of counts
   jubyte* _card_counts;
   // Max capacity of the reserved space for the counts table
   size_t _reserved_max_card_num;
   // CardTable bottom.
   const jbyte* _ct_bot;
   // Barrier set
   CardTableModRefBS* _ct_bs;
   // Returns true if the card counts table has been reserved.
   bool has_reserved_count_table() { return _card_counts != NULL; }
   // Returns true if the card counts table has been reserved and committed.
   bool has_count_table() {
     return has_reserved_count_table();
   }
   size_t ptr_2_card_num(const jbyte* card_ptr) {
     assert(card_ptr >= _ct_bot,
            err_msg("Invalid card pointer: "
                    "card_ptr: " PTR_FORMAT ", "
                    "_ct_bot: " PTR_FORMAT,
                    p2i(card_ptr), p2i(_ct_bot)));
     size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
     assert(card_num >= 0 && card_num < _reserved_max_card_num,
            err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr)));
     return card_num;
   }
   jbyte* card_num_2_ptr(size_t card_num) {
     assert(card_num >= 0 && card_num < _reserved_max_card_num,
            err_msg("card num out of range: "SIZE_FORMAT, card_num));
     return (jbyte*) (_ct_bot + card_num);
   }
   // Clear the counts table for the given (exclusive) index range.
   void clear_range(size_t from_card_num, size_t to_card_num);
  public:
   G1CardCounts(G1CollectedHeap* g1h);
   void initialize(G1RegionToSpaceMapper* mapper);
   // Increments the refinement count for the given card.
   // Returns the pre-increment count value.
   uint add_card_count(jbyte* card_ptr);
   // Returns true if the given count is high enough to be considered
   // 'hot'; false otherwise.
   bool is_hot(uint count);
   // Clears the card counts for the cards spanned by the region
   void clear_region(HeapRegion* hr);
   // Clears the card counts for the cards spanned by the MemRegion
   void clear_range(MemRegion mr);
   // Clear the entire card counts table during GC.
   void clear_all();
 };
 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/gc_implementation/g1/g1CardCounts.hpp@c2844108a708 (annotated)

src/share/vm/gc_implementation/g1/g1CardCounts.hpp