Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/g1/g1CardCounts.hpp @ 20280:bac98749fe00
8049831: Metadata Full GCs are not triggered when CMSClassUnloadingEnabled is turned off
Reviewed-by: brutisso, tschatzl, ehelin, jmasa, dfazunen
author | stefank |
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date | Fri, 11 Jul 2014 09:07:23 +0200 |
parents | 78bbf4d43a14 |
children | 1f1d373cd044 |
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/* * 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 "memory/allocation.hpp" #include "runtime/virtualspace.hpp" #include "utilities/globalDefinitions.hpp" class CardTableModRefBS; class G1CollectedHeap; class HeapRegion; // 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> { 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; // Max capacity of the committed space for the counts table size_t _committed_max_card_num; // Size of committed space for the counts table size_t _committed_size; // CardTable bottom. const jbyte* _ct_bot; // Barrier set CardTableModRefBS* _ct_bs; // The virtual memory backing the counts table VirtualSpace _card_counts_storage; // 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() && _committed_max_card_num > 0; } 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 < _committed_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 < _committed_max_card_num, err_msg("card num out of range: "SIZE_FORMAT, card_num)); return (jbyte*) (_ct_bot + card_num); } // Helper routine. // Returns the number of cards that can be counted by the given committed // table size, with a maximum of the number of cards spanned by the max // capacity of the heap. size_t committed_to_card_num(size_t committed_size) { return MIN2(_reserved_max_card_num, committed_size / sizeof(jbyte)); } // 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); ~G1CardCounts(); void initialize(); // Resize the committed space for the card counts table in // response to a resize of the committed space for the heap. void resize(size_t heap_capacity); // 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); // Clear the entire card counts table during GC. // Updates the policy stats with the duration. void clear_all(); }; #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1CARDCOUNTS_HPP