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annotate src/share/vm/runtime/memprofiler.hpp @ 3979:4dfb2df418f2

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6484982: G1: process references during evacuation pauses Summary: G1 now uses two reference processors - one is used by concurrent marking and the other is used by STW GCs (both full and incremental evacuation pauses). In an evacuation pause, the reference processor is embedded into the closures used to scan objects. Doing so causes causes reference objects to be 'discovered' by the reference processor. At the end of the evacuation pause, these discovered reference objects are processed - preserving (and copying) referent objects (and their reachable graphs) as appropriate. Reviewed-by: ysr, jwilhelm, brutisso, stefank, tonyp
author johnc
date Thu, 22 Sep 2011 10:57:37 -0700
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1 /*
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2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_RUNTIME_MEMPROFILER_HPP
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26 #define SHARE_VM_RUNTIME_MEMPROFILER_HPP
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27
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28 // Prints periodic memory usage trace of HotSpot VM
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29
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30 class MemProfilerTask;
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31
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32 class MemProfiler : AllStatic {
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33 friend class MemProfilerTask;
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34 private:
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35 static MemProfilerTask* _task;
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36 static FILE* _log_fp;
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37 // Do trace (callback from MemProfilerTask and from disengage)
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38 static void do_trace() PRODUCT_RETURN;
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39 public:
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40 // Start/stop the profiler
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41 static void engage() PRODUCT_RETURN;
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42 static void disengage() PRODUCT_RETURN;
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43 // Tester
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44 static bool is_active() PRODUCT_RETURN0;
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45 };
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46
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47 #endif // SHARE_VM_RUNTIME_MEMPROFILER_HPP