hotspot/src/share/vm/gc/g1/concurrentG1Refine.hpp
author mgerdin
Fri, 11 Mar 2016 11:22:56 +0100
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8152101: Move G1 concurrent refinement adjustment code out of G1CollectorPolicy Reviewed-by: jmasa, jwilhelm, kbarrett
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/*
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 * Copyright (c) 2001, 2016, 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 G1Predictions;
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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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  size_t _green_zone;
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  size_t _yellow_zone;
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  size_t _red_zone;
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  size_t _thread_threshold_step;
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  double _predictor_sigma;
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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, const G1Predictions* predictions);
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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 adjust(double update_rs_time, double update_rs_processed_buffers, double goal_ms);
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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(size_t x)  { _green_zone = x;  }
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  void set_yellow_zone(size_t x) { _yellow_zone = x; }
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  void set_red_zone(size_t x)    { _red_zone = x;    }
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  size_t green_zone() const      { return _green_zone;  }
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  size_t yellow_zone() const     { return _yellow_zone; }
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  size_t red_zone() const        { return _red_zone;    }
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  uint worker_thread_num() const { return _n_worker_threads; }
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  size_t 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