121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
/*
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* Copyright (c) 2001, 2015, 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_G1_CONCURRENTG1REFINE_HPP
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#define SHARE_VM_GC_G1_CONCURRENTG1REFINE_HPP
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#include "gc/g1/g1HotCardCache.hpp"
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#include "gc/g1/g1YoungRemSetSamplingThread.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 G1RegionToSpaceMapper;
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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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G1YoungRemSetSamplingThread* _sample_thread;
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ConcurrentG1RefineThread** _threads;
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uint _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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ConcurrentG1Refine(G1CollectedHeap* g1h);
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public:
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~ConcurrentG1Refine();
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// Returns ConcurrentG1Refine instance if succeeded to create/initialize ConcurrentG1Refine and ConcurrentG1RefineThread.
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// Otherwise, returns NULL with error code.
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static ConcurrentG1Refine* create(G1CollectedHeap* g1h, CardTableEntryClosure* refine_closure, jint* ecode);
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void init(G1RegionToSpaceMapper* card_counts_storage);
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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 has nothing to do with refinement, but is here for now.
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G1YoungRemSetSamplingThread * sampling_thread() const { return _sample_thread; }
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static uint 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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uint 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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static bool hot_card_cache_enabled() { return G1HotCardCache::default_use_cache(); }
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};
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#endif // SHARE_VM_GC_G1_CONCURRENTG1REFINE_HPP
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