154a1a02bf
Use script and some manual fixup to fix directores names in include guards. Reviewed-by: lfoltan, eosterlund, kbarrett
100 lines
3.1 KiB
C++
100 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018, Red Hat, Inc. All rights reserved.
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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_SHENANDOAH_SHENANDOAHPACER_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAHPACER_HPP
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#include "gc/shenandoah/shenandoahNumberSeq.hpp"
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#include "memory/allocation.hpp"
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class ShenandoahHeap;
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#define PACING_PROGRESS_UNINIT (-1)
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#define PACING_PROGRESS_ZERO ( 0)
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/**
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* ShenandoahPacer provides allocation pacing mechanism.
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*
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* Currently it implements simple tax-and-spend pacing policy: GC threads provide
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* credit, allocating thread spend the credit, or stall when credit is not available.
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*/
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class ShenandoahPacer : public CHeapObj<mtGC> {
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private:
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ShenandoahHeap* _heap;
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BinaryMagnitudeSeq _delays;
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TruncatedSeq* _progress_history;
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// Set once per phase
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volatile intptr_t _epoch;
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volatile double _tax_rate;
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// Heavily updated, protect from accidental false sharing
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DEFINE_PAD_MINUS_SIZE(0, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile intptr_t));
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volatile intptr_t _budget;
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DEFINE_PAD_MINUS_SIZE(1, DEFAULT_CACHE_LINE_SIZE, 0);
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// Heavily updated, protect from accidental false sharing
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DEFINE_PAD_MINUS_SIZE(2, DEFAULT_CACHE_LINE_SIZE, sizeof(volatile intptr_t));
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volatile intptr_t _progress;
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DEFINE_PAD_MINUS_SIZE(3, DEFAULT_CACHE_LINE_SIZE, 0);
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public:
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ShenandoahPacer(ShenandoahHeap* heap) :
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_heap(heap),
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_progress_history(new TruncatedSeq(5)),
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_epoch(0),
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_tax_rate(1),
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_budget(0),
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_progress(PACING_PROGRESS_UNINIT) {}
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void setup_for_idle();
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void setup_for_mark();
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void setup_for_evac();
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void setup_for_updaterefs();
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void setup_for_traversal();
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inline void report_mark(size_t words);
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inline void report_evac(size_t words);
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inline void report_updaterefs(size_t words);
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inline void report_alloc(size_t words);
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bool claim_for_alloc(size_t words, bool force);
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void pace_for_alloc(size_t words);
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void unpace_for_alloc(intptr_t epoch, size_t words);
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intptr_t epoch();
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void print_on(outputStream* out) const;
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private:
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inline void report_internal(size_t words);
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inline void report_progress_internal(size_t words);
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void restart_with(size_t non_taxable_bytes, double tax_rate);
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size_t update_and_get_progress_history();
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};
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHPACER_HPP
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