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annotate src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp @ 3285:49a67202bc67

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7011855: G1: non-product flag to artificially grow the heap Summary: It introduces non-product cmd line parameter G1DummyRegionsPerGC which indicates how many "dummy" regions to allocate at the end of each GC. This allows the G1 heap to grow artificially and makes concurrent marking cycles more frequent irrespective of what the application that is running is doing. The dummy regions will be found totally empty during cleanup so this parameter can also be used to stress the concurrent cleanup operation. Reviewed-by: brutisso, johnc
author tonyp
date Tue, 19 Apr 2011 15:46:59 -0400
parents f95d63e2154a
children c3f1170908be
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1 /*
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2 * Copyright (c) 2001, 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_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP
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27
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28 #include "gc_implementation/g1/heapRegionSeq.hpp"
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29
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30 inline HeapRegion* HeapRegionSeq::addr_to_region(const void* addr) {
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31 assert(_seq_bottom != NULL, "bad _seq_bottom in addr_to_region");
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32 if ((char*) addr >= _seq_bottom) {
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33 size_t diff = (size_t) pointer_delta((HeapWord*) addr,
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34 (HeapWord*) _seq_bottom);
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35 int index = (int) (diff >> HeapRegion::LogOfHRGrainWords);
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36 assert(index >= 0, "invariant / paranoia");
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37 if (index < _regions.length()) {
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38 HeapRegion* hr = _regions.at(index);
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39 assert(hr->is_in_reserved(addr),
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40 "addr_to_region is wrong...");
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41 return hr;
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42 }
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43 }
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44 return NULL;
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45 }
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47 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP