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annotate src/share/vm/gc_implementation/shared/immutableSpace.hpp @ 10374:87c64c0438fb

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6976350: G1: deal with fragmentation while copying objects during GC Summary: Create G1ParGCAllocBufferContainer to contain two buffers instead of previously using one buffer, in order to hold the first priority buffer longer. Thus, when some large objects hits the value of free space left in the first priority buffer it has an alternative to fit in the second priority buffer while the first priority buffer is given more chances to try allocating smaller objects. Overall, it will improve heap space efficiency. Reviewed-by: johnc, jmasa, brutisso Contributed-by: tamao <tao.mao@oracle.com>
author tamao
date Mon, 03 Jun 2013 14:37:13 -0700
parents da91efe96a93
children
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1 /*
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2 * Copyright (c) 2001, 2012, 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_SHARED_IMMUTABLESPACE_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP
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27
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28 #include "memory/iterator.hpp"
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29
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30 // An ImmutableSpace is a viewport into a contiguous range
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31 // (or subrange) of previously allocated objects.
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32
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33 // Invariant: bottom() and end() are on page_size boundaries and
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34 // bottom() <= end()
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35
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36 class ImmutableSpace: public CHeapObj<mtGC> {
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37 friend class VMStructs;
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38 protected:
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39 HeapWord* _bottom;
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40 HeapWord* _end;
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41
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42 public:
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43 ImmutableSpace() { _bottom = NULL; _end = NULL; }
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44 HeapWord* bottom() const { return _bottom; }
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45 HeapWord* end() const { return _end; }
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46
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47 MemRegion region() const { return MemRegion(bottom(), end()); }
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48
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49 // Initialization
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50 void initialize(MemRegion mr);
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51
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52 bool contains(const void* p) const { return _bottom <= p && p < _end; }
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53
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54 // Size computations. Sizes are in bytes.
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55 size_t capacity_in_bytes() const { return capacity_in_words() * HeapWordSize; }
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56
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57 // Size computations. Sizes are in heapwords.
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58 size_t capacity_in_words() const { return pointer_delta(end(), bottom()); }
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59 virtual size_t capacity_in_words(Thread*) const { return capacity_in_words(); }
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60
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61 // Iteration.
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62 virtual void oop_iterate(ExtendedOopClosure* cl);
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63 virtual void object_iterate(ObjectClosure* cl);
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64
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65 // Debugging
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66 virtual void print() const PRODUCT_RETURN;
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67 virtual void print_short() const PRODUCT_RETURN;
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68 virtual void verify();
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69 };
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71 #endif // SHARE_VM_GC_IMPLEMENTATION_SHARED_IMMUTABLESPACE_HPP