| /* |
| * Copyright (c) 2001, 2016, 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_G1_CONCURRENTG1REFINE_HPP |
| #define SHARE_VM_GC_G1_CONCURRENTG1REFINE_HPP |
| |
| #include "gc/g1/g1HotCardCache.hpp" |
| #include "gc/g1/g1YoungRemSetSamplingThread.hpp" |
| #include "memory/allocation.hpp" |
| #include "runtime/thread.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| |
| // Forward decl |
| class ConcurrentG1RefineThread; |
| class G1CollectedHeap; |
| class G1HotCardCache; |
| class G1Predictions; |
| class G1RegionToSpaceMapper; |
| class G1RemSet; |
| class DirtyCardQueue; |
| |
| class ConcurrentG1Refine: public CHeapObj<mtGC> { |
| G1YoungRemSetSamplingThread* _sample_thread; |
| |
| ConcurrentG1RefineThread** _threads; |
| uint _n_worker_threads; |
| /* |
| * The value of the update buffer queue length falls into one of 3 zones: |
| * green, yellow, red. If the value is in [0, green) nothing is |
| * done, the buffers are left unprocessed to enable the caching effect of the |
| * dirtied cards. In the yellow zone [green, yellow) the concurrent refinement |
| * threads are gradually activated. In [yellow, red) all threads are |
| * running. If the length becomes red (max queue length) the mutators start |
| * processing the buffers. |
| * |
| * There are some interesting cases (when G1UseAdaptiveConcRefinement |
| * is turned off): |
| * 1) green = yellow = red = 0. In this case the mutator will process all |
| * buffers. Except for those that are created by the deferred updates |
| * machinery during a collection. |
| * 2) green = 0. Means no caching. Can be a good way to minimize the |
| * amount of time spent updating rsets during a collection. |
| */ |
| size_t _green_zone; |
| size_t _yellow_zone; |
| size_t _red_zone; |
| size_t _min_yellow_zone_size; |
| |
| // We delay the refinement of 'hot' cards using the hot card cache. |
| G1HotCardCache _hot_card_cache; |
| |
| ConcurrentG1Refine(G1CollectedHeap* g1h, |
| size_t green_zone, |
| size_t yellow_zone, |
| size_t red_zone, |
| size_t min_yellow_zone_size); |
| |
| // Update green/yellow/red zone values based on how well goals are being met. |
| void update_zones(double update_rs_time, |
| size_t update_rs_processed_buffers, |
| double goal_ms); |
| |
| // Update thread thresholds to account for updated zone values. |
| void update_thread_thresholds(); |
| |
| public: |
| ~ConcurrentG1Refine(); |
| |
| // Returns ConcurrentG1Refine instance if succeeded to create/initialize ConcurrentG1Refine and ConcurrentG1RefineThread. |
| // Otherwise, returns NULL with error code. |
| static ConcurrentG1Refine* create(G1CollectedHeap* g1h, CardTableEntryClosure* refine_closure, jint* ecode); |
| |
| void init(G1RegionToSpaceMapper* card_counts_storage); |
| void stop(); |
| |
| void adjust(double update_rs_time, size_t update_rs_processed_buffers, double goal_ms); |
| |
| // Iterate over all concurrent refinement threads |
| void threads_do(ThreadClosure *tc); |
| |
| // Iterate over all worker refinement threads |
| void worker_threads_do(ThreadClosure * tc); |
| |
| // The RS sampling thread has nothing to do with refinement, but is here for now. |
| G1YoungRemSetSamplingThread * sampling_thread() const { return _sample_thread; } |
| |
| static uint thread_num(); |
| |
| void print_worker_threads_on(outputStream* st) const; |
| |
| size_t green_zone() const { return _green_zone; } |
| size_t yellow_zone() const { return _yellow_zone; } |
| size_t red_zone() const { return _red_zone; } |
| |
| G1HotCardCache* hot_card_cache() { return &_hot_card_cache; } |
| |
| static bool hot_card_cache_enabled() { return G1HotCardCache::default_use_cache(); } |
| }; |
| |
| #endif // SHARE_VM_GC_G1_CONCURRENTG1REFINE_HPP |