79 lines
3.1 KiB
C++
79 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018, 2019, 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_GC_SHARED_WORKERPOLICY_HPP
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#define SHARE_GC_SHARED_WORKERPOLICY_HPP
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#include "memory/allocation.hpp"
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#include "utilities/globalDefinitions.hpp"
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class WorkerPolicy : public AllStatic {
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static const uint GCWorkersPerJavaThread = 2;
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static bool _debug_perturbation;
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static uint _parallel_worker_threads;
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static bool _parallel_worker_threads_initialized;
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static uint nof_parallel_worker_threads(uint num,
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uint den,
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uint switch_pt);
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// Calculates and returns the number of parallel GC threads. May
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// be CPU-architecture-specific.
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static uint calc_parallel_worker_threads();
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public:
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// Returns the number of parallel threads to be used as default value of
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// ParallelGCThreads. If that number has not been calculated, do so and
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// save it. Returns ParallelGCThreads if it is set on the
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// command line.
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static uint parallel_worker_threads();
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// Return number default GC threads to use in the next GC.
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static uint calc_default_active_workers(uintx total_workers,
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const uintx min_workers,
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uintx active_workers,
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uintx application_workers);
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// Return number of GC threads to use in the next GC.
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// This is called sparingly so as not to change the
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// number of GC workers gratuitously.
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// For PS scavenge and ParOld collections
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// For G1 evacuation pauses (subject to update)
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// For G1 Full GCs (subject to update)
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// Other collection phases inherit the number of
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// GC workers from the calls above.
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static uint calc_active_workers(uintx total_workers,
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uintx active_workers,
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uintx application_workers);
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// Return number of GC threads to use in the next concurrent GC phase.
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static uint calc_active_conc_workers(uintx total_workers,
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uintx active_workers,
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uintx application_workers);
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};
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#endif // SHARE_GC_SHARED_WORKERPOLICY_HPP
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