--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/g1/concurrentG1Refine.hpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,107 @@
+/*
+ * 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 "memory/allocation.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+// Forward decl
+class CardTableEntryClosure;
+class ConcurrentG1RefineThread;
+class G1YoungRemSetSamplingThread;
+class outputStream;
+class ThreadClosure;
+
+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;
+
+ ConcurrentG1Refine(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(jint* ecode);
+
+ 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; }
+};
+
+#endif // SHARE_VM_GC_G1_CONCURRENTG1REFINE_HPP