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/*
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* Copyright 2001-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// Forward decl
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class ConcurrentG1RefineThread;
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class G1RemSet;
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// What to do after a yield:
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enum PostYieldAction {
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PYA_continue, // Continue the traversal
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PYA_restart, // Restart
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PYA_cancel // It's been completed by somebody else: cancel.
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};
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class ConcurrentG1Refine {
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ConcurrentG1RefineThread* _cg1rThread;
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volatile jint _pya;
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PostYieldAction _last_pya;
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static bool _enabled; // Protected by G1ConcRefine_mon.
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unsigned _traversals;
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// Number of cards processed during last refinement traversal.
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unsigned _first_traversal;
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unsigned _last_cards_during;
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// The cache for card refinement.
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bool _use_cache;
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bool _def_use_cache;
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size_t _n_periods;
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size_t _total_cards;
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size_t _total_travs;
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unsigned char* _card_counts;
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unsigned _n_card_counts;
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const jbyte* _ct_bot;
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unsigned* _cur_card_count_histo;
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unsigned* _cum_card_count_histo;
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jbyte** _hot_cache;
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int _hot_cache_size;
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int _n_hot;
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int _hot_cache_idx;
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// Returns the count of this card after incrementing it.
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int add_card_count(jbyte* card_ptr);
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void print_card_count_histo_range(unsigned* histo, int from, int to,
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float& cum_card_pct,
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float& cum_travs_pct);
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public:
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ConcurrentG1Refine();
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~ConcurrentG1Refine();
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void init(); // Accomplish some initialization that has to wait.
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// Enabled Conc refinement, waking up thread if necessary.
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void enable();
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// Returns the number of traversals performed since this refiner was enabled.
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unsigned disable();
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// Requires G1ConcRefine_mon to be held.
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bool enabled() { return _enabled; }
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// Returns only when G1 concurrent refinement has been enabled.
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void wait_for_ConcurrentG1Refine_enabled();
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// Do one concurrent refinement pass over the card table. Returns "true"
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// if heuristics determine that another pass should be done immediately.
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bool refine();
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// Indicate that an in-progress refinement pass should start over.
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void set_pya_restart();
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// Indicate that an in-progress refinement pass should quit.
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void set_pya_cancel();
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// Get the appropriate post-yield action. Also sets last_pya.
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PostYieldAction get_pya();
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// The last PYA read by "get_pya".
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PostYieldAction get_last_pya();
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bool do_traversal();
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ConcurrentG1RefineThread* cg1rThread() { return _cg1rThread; }
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// If this is the first entry for the slot, writes into the cache and
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// returns NULL. If it causes an eviction, returns the evicted pointer.
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// Otherwise, its a cache hit, and returns NULL.
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jbyte* cache_insert(jbyte* card_ptr);
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// Process the cached entries.
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void clean_up_cache(int worker_i, G1RemSet* g1rs);
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// Discard entries in the hot cache.
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void clear_hot_cache() {
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_hot_cache_idx = 0; _n_hot = 0;
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}
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bool hot_cache_is_empty() { return _n_hot == 0; }
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bool use_cache() { return _use_cache; }
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void set_use_cache(bool b) {
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if (b) _use_cache = _def_use_cache;
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else _use_cache = false;
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}
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void clear_and_record_card_counts();
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void print_final_card_counts();
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};
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