86 lines
3.0 KiB
C++
86 lines
3.0 KiB
C++
/*
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* Copyright (c) 2016, 2019, Red Hat, Inc. 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_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP
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#define SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP
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#include "memory/allocation.hpp"
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/**
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* This provides the following in JVMStat:
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*
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* constants:
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* - sun.gc.shenandoah.regions.timestamp the timestamp for this sample
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* - sun.gc.shenandoah.regions.max_regions maximum number of regions
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* - sun.gc.shenandoah.regions.region_size size per region, in kilobytes
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*
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* variables:
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* - sun.gc.shenandoah.regions.status current GC status:
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* - bit 0 set when marking in progress
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* - bit 1 set when evacuation in progress
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* - bit 2 set when update refs in progress
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*
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* two variable counters per region, with $max_regions (see above) counters:
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* - sun.gc.shenandoah.regions.region.$i.data
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* where $ is the region number from 0 <= i < $max_regions
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*
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* .data is in the following format:
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* - bits 0-6 used memory in percent
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* - bits 7-13 live memory in percent
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* - bits 14-20 tlab allocated memory in percent
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* - bits 21-27 gclab allocated memory in percent
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* - bits 28-34 shared allocated memory in percent
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* - bits 35-41 <reserved>
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* - bits 42-50 <reserved>
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* - bits 51-57 <reserved>
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* - bits 58-63 status
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* - bits describe the state as recorded in ShenandoahHeapRegion
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*/
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class ShenandoahHeapRegionCounters : public CHeapObj<mtGC> {
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private:
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static const jlong PERCENT_MASK = 0x7f;
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static const jlong STATUS_MASK = 0x3f;
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static const jlong USED_SHIFT = 0;
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static const jlong LIVE_SHIFT = 7;
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static const jlong TLAB_SHIFT = 14;
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static const jlong GCLAB_SHIFT = 21;
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static const jlong SHARED_SHIFT = 28;
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static const jlong STATUS_SHIFT = 58;
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char* _name_space;
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PerfLongVariable** _regions_data;
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PerfLongVariable* _timestamp;
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PerfLongVariable* _status;
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volatile jlong _last_sample_millis;
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public:
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ShenandoahHeapRegionCounters();
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~ShenandoahHeapRegionCounters();
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void update();
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};
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#endif // SHARE_GC_SHENANDOAH_SHENANDOAHHEAPREGIONCOUNTERS_HPP
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