author | jwilhelm |
Thu, 03 Oct 2013 21:36:29 +0200 | |
changeset 20398 | b206c580c45f |
parent 17854 | d65bc1546091 |
child 23855 | c4574075402c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2013, 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_CONCURRENTG1REFINE_HPP |
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#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP |
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#include "gc_implementation/g1/g1HotCardCache.hpp" |
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#include "memory/allocation.hpp" |
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#include "runtime/thread.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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// Forward decl |
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class ConcurrentG1RefineThread; |
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class G1CollectedHeap; |
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class G1HotCardCache; |
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class G1RemSet; |
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class DirtyCardQueue; |
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class ConcurrentG1Refine: public CHeapObj<mtGC> { |
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ConcurrentG1RefineThread** _threads; |
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int _n_threads; |
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int _n_worker_threads; |
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/* |
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* The value of the update buffer queue length falls into one of 3 zones: |
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* green, yellow, red. If the value is in [0, green) nothing is |
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* done, the buffers are left unprocessed to enable the caching effect of the |
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* dirtied cards. In the yellow zone [green, yellow) the concurrent refinement |
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* threads are gradually activated. In [yellow, red) all threads are |
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* running. If the length becomes red (max queue length) the mutators start |
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* processing the buffers. |
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* |
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* There are some interesting cases (when G1UseAdaptiveConcRefinement |
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* is turned off): |
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* 1) green = yellow = red = 0. In this case the mutator will process all |
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* buffers. Except for those that are created by the deferred updates |
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* machinery during a collection. |
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* 2) green = 0. Means no caching. Can be a good way to minimize the |
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* amount of time spent updating rsets during a collection. |
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*/ |
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int _green_zone; |
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int _yellow_zone; |
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int _red_zone; |
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int _thread_threshold_step; |
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// We delay the refinement of 'hot' cards using the hot card cache. |
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G1HotCardCache _hot_card_cache; |
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// Reset the threshold step value based of the current zone boundaries. |
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void reset_threshold_step(); |
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public: |
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ConcurrentG1Refine(G1CollectedHeap* g1h); |
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~ConcurrentG1Refine(); |
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void init(); // Accomplish some initialization that has to wait. |
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void stop(); |
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void reinitialize_threads(); |
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// Iterate over all concurrent refinement threads |
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void threads_do(ThreadClosure *tc); |
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// Iterate over all worker refinement threads |
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void worker_threads_do(ThreadClosure * tc); |
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// The RS sampling thread |
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ConcurrentG1RefineThread * sampling_thread() const; |
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static int thread_num(); |
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void print_worker_threads_on(outputStream* st) const; |
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void set_green_zone(int x) { _green_zone = x; } |
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void set_yellow_zone(int x) { _yellow_zone = x; } |
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void set_red_zone(int x) { _red_zone = x; } |
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int green_zone() const { return _green_zone; } |
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int yellow_zone() const { return _yellow_zone; } |
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int red_zone() const { return _red_zone; } |
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int total_thread_num() const { return _n_threads; } |
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int worker_thread_num() const { return _n_worker_threads; } |
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int thread_threshold_step() const { return _thread_threshold_step; } |
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G1HotCardCache* hot_card_cache() { return &_hot_card_cache; } |
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}; |
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#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTG1REFINE_HPP |