johnc@5078: /*
drchase@6680:  * Copyright (c) 2013, 2014, Oracle and/or its affiliates. All rights reserved.
johnc@5078:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
johnc@5078:  *
johnc@5078:  * This code is free software; you can redistribute it and/or modify it
johnc@5078:  * under the terms of the GNU General Public License version 2 only, as
johnc@5078:  * published by the Free Software Foundation.
johnc@5078:  *
johnc@5078:  * This code is distributed in the hope that it will be useful, but WITHOUT
johnc@5078:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
johnc@5078:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
johnc@5078:  * version 2 for more details (a copy is included in the LICENSE file that
johnc@5078:  * accompanied this code).
johnc@5078:  *
johnc@5078:  * You should have received a copy of the GNU General Public License version
johnc@5078:  * 2 along with this work; if not, write to the Free Software Foundation,
johnc@5078:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
johnc@5078:  *
johnc@5078:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
johnc@5078:  * or visit www.oracle.com if you need additional information or have any
johnc@5078:  * questions.
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johnc@5078:  */
johnc@5078: 
johnc@5078: #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP
johnc@5078: #define SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP
johnc@5078: 
tschatzl@7051: #include "gc_implementation/g1/g1RegionToSpaceMapper.hpp"
johnc@5078: #include "memory/allocation.hpp"
johnc@5078: #include "runtime/virtualspace.hpp"
johnc@5078: #include "utilities/globalDefinitions.hpp"
johnc@5078: 
johnc@5078: class CardTableModRefBS;
tschatzl@7051: class G1CardCounts;
johnc@5078: class G1CollectedHeap;
tschatzl@7051: class G1RegionToSpaceMapper;
johnc@5078: class HeapRegion;
johnc@5078: 
tschatzl@7051: class G1CardCountsMappingChangedListener : public G1MappingChangedListener {
tschatzl@7051:  private:
tschatzl@7051:   G1CardCounts* _counts;
tschatzl@7051:  public:
tschatzl@7051:   void set_cardcounts(G1CardCounts* counts) { _counts = counts; }
tschatzl@7051: 
tschatzl@7257:   virtual void on_commit(uint start_idx, size_t num_regions, bool zero_filled);
tschatzl@7051: };
tschatzl@7051: 
johnc@5078: // Table to track the number of times a card has been refined. Once
johnc@5078: // a card has been refined a certain number of times, it is
johnc@5078: // considered 'hot' and its refinement is delayed by inserting the
johnc@5078: // card into the hot card cache. The card will then be refined when
johnc@5078: // it is evicted from the hot card cache, or when the hot card cache
johnc@5078: // is 'drained' during the next evacuation pause.
johnc@5078: 
johnc@5078: class G1CardCounts: public CHeapObj<mtGC> {
tschatzl@7051:   G1CardCountsMappingChangedListener _listener;
tschatzl@7051: 
johnc@5078:   G1CollectedHeap* _g1h;
johnc@5078: 
johnc@5078:   // The table of counts
johnc@5078:   jubyte* _card_counts;
johnc@5078: 
johnc@5078:   // Max capacity of the reserved space for the counts table
johnc@5078:   size_t _reserved_max_card_num;
johnc@5078: 
johnc@5078:   // CardTable bottom.
johnc@5078:   const jbyte* _ct_bot;
johnc@5078: 
johnc@5078:   // Barrier set
johnc@5078:   CardTableModRefBS* _ct_bs;
johnc@5078: 
johnc@5078:   // Returns true if the card counts table has been reserved.
johnc@5078:   bool has_reserved_count_table() { return _card_counts != NULL; }
johnc@5078: 
johnc@5078:   // Returns true if the card counts table has been reserved and committed.
johnc@5078:   bool has_count_table() {
tschatzl@7051:     return has_reserved_count_table();
johnc@5078:   }
johnc@5078: 
johnc@5078:   size_t ptr_2_card_num(const jbyte* card_ptr) {
johnc@5078:     assert(card_ptr >= _ct_bot,
shade@5709:            err_msg("Invalid card pointer: "
johnc@5078:                    "card_ptr: " PTR_FORMAT ", "
johnc@5078:                    "_ct_bot: " PTR_FORMAT,
drchase@6680:                    p2i(card_ptr), p2i(_ct_bot)));
johnc@5078:     size_t card_num = pointer_delta(card_ptr, _ct_bot, sizeof(jbyte));
tschatzl@7051:     assert(card_num >= 0 && card_num < _reserved_max_card_num,
drchase@6680:            err_msg("card pointer out of range: " PTR_FORMAT, p2i(card_ptr)));
johnc@5078:     return card_num;
johnc@5078:   }
johnc@5078: 
johnc@5078:   jbyte* card_num_2_ptr(size_t card_num) {
tschatzl@7051:     assert(card_num >= 0 && card_num < _reserved_max_card_num,
kevinw@9327:            err_msg("card num out of range: " SIZE_FORMAT, card_num));
johnc@5078:     return (jbyte*) (_ct_bot + card_num);
johnc@5078:   }
johnc@5078: 
johnc@5078:   // Clear the counts table for the given (exclusive) index range.
johnc@5078:   void clear_range(size_t from_card_num, size_t to_card_num);
johnc@5078: 
johnc@5078:  public:
johnc@5078:   G1CardCounts(G1CollectedHeap* g1h);
johnc@5078: 
tschatzl@7051:   void initialize(G1RegionToSpaceMapper* mapper);
johnc@5078: 
johnc@5078:   // Increments the refinement count for the given card.
johnc@5078:   // Returns the pre-increment count value.
johnc@5078:   uint add_card_count(jbyte* card_ptr);
johnc@5078: 
johnc@5078:   // Returns true if the given count is high enough to be considered
johnc@5078:   // 'hot'; false otherwise.
johnc@5078:   bool is_hot(uint count);
johnc@5078: 
johnc@5078:   // Clears the card counts for the cards spanned by the region
johnc@5078:   void clear_region(HeapRegion* hr);
johnc@5078: 
tschatzl@7051:   // Clears the card counts for the cards spanned by the MemRegion
tschatzl@7051:   void clear_range(MemRegion mr);
tschatzl@7051: 
johnc@5078:   // Clear the entire card counts table during GC.
johnc@5078:   void clear_all();
johnc@5078: };
johnc@5078: 
johnc@5078: #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP