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annotate src/share/vm/gc_implementation/g1/g1AllocRegion.hpp @ 20807:8d4496e10a51

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Fix merge
author Gilles Duboscq <gilles.m.duboscq@oracle.com>
date Wed, 08 Apr 2015 11:07:01 +0200
parents 7848fc12602b
children
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1 /*
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2 * Copyright (c) 2011, 2014, 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_G1ALLOCREGION_HPP
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26 #define SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_HPP
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27
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28 #include "gc_implementation/g1/heapRegion.hpp"
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29
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30 class G1CollectedHeap;
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31
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32 // 0 -> no tracing, 1 -> basic tracing, 2 -> basic + allocation tracing
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33 #define G1_ALLOC_REGION_TRACING 0
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34
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35 class ar_ext_msg;
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36
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37 // A class that holds a region that is active in satisfying allocation
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38 // requests, potentially issued in parallel. When the active region is
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39 // full it will be retired and replaced with a new one. The
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40 // implementation assumes that fast-path allocations will be lock-free
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41 // and a lock will need to be taken when the active region needs to be
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42 // replaced.
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43
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44 class G1AllocRegion VALUE_OBJ_CLASS_SPEC {
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45 friend class ar_ext_msg;
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46
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47 private:
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48 // The active allocating region we are currently allocating out
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49 // of. The invariant is that if this object is initialized (i.e.,
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50 // init() has been called and release() has not) then _alloc_region
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51 // is either an active allocating region or the dummy region (i.e.,
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52 // it can never be NULL) and this object can be used to satisfy
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53 // allocation requests. If this object is not initialized
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54 // (i.e. init() has not been called or release() has been called)
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55 // then _alloc_region is NULL and this object should not be used to
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56 // satisfy allocation requests (it was done this way to force the
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57 // correct use of init() and release()).
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58 HeapRegion* volatile _alloc_region;
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59
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60 // Allocation context associated with this alloc region.
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61 AllocationContext_t _allocation_context;
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62
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63 // It keeps track of the distinct number of regions that are used
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64 // for allocation in the active interval of this object, i.e.,
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65 // between a call to init() and a call to release(). The count
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66 // mostly includes regions that are freshly allocated, as well as
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67 // the region that is re-used using the set() method. This count can
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68 // be used in any heuristics that might want to bound how many
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69 // distinct regions this object can used during an active interval.
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70 uint _count;
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71
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72 // When we set up a new active region we save its used bytes in this
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73 // field so that, when we retire it, we can calculate how much space
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74 // we allocated in it.
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75 size_t _used_bytes_before;
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76
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77 // When true, indicates that allocate calls should do BOT updates.
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78 const bool _bot_updates;
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79
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80 // Useful for debugging and tracing.
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81 const char* _name;
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82
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83 // A dummy region (i.e., it's been allocated specially for this
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84 // purpose and it is not part of the heap) that is full (i.e., top()
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85 // == end()). When we don't have a valid active region we make
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86 // _alloc_region point to this. This allows us to skip checking
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87 // whether the _alloc_region is NULL or not.
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88 static HeapRegion* _dummy_region;
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89
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90 // Some of the methods below take a bot_updates parameter. Its value
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91 // should be the same as the _bot_updates field. The idea is that
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92 // the parameter will be a constant for a particular alloc region
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93 // and, given that these methods will be hopefully inlined, the
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94 // compiler should compile out the test.
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95
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96 // Perform a non-MT-safe allocation out of the given region.
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97 static inline HeapWord* allocate(HeapRegion* alloc_region,
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98 size_t word_size,
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99 bool bot_updates);
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100
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101 // Perform a MT-safe allocation out of the given region.
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102 static inline HeapWord* par_allocate(HeapRegion* alloc_region,
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103 size_t word_size,
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104 bool bot_updates);
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105
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106 // Ensure that the region passed as a parameter has been filled up
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107 // so that noone else can allocate out of it any more.
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108 static void fill_up_remaining_space(HeapRegion* alloc_region,
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109 bool bot_updates);
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110
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111 // Retire the active allocating region. If fill_up is true then make
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112 // sure that the region is full before we retire it so that noone
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113 // else can allocate out of it.
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114 void retire(bool fill_up);
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115
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116 // After a region is allocated by alloc_new_region, this
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117 // method is used to set it as the active alloc_region
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118 void update_alloc_region(HeapRegion* alloc_region);
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119
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120 // Allocate a new active region and use it to perform a word_size
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121 // allocation. The force parameter will be passed on to
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122 // G1CollectedHeap::allocate_new_alloc_region() and tells it to try
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123 // to allocate a new region even if the max has been reached.
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124 HeapWord* new_alloc_region_and_allocate(size_t word_size, bool force);
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125
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126 void fill_in_ext_msg(ar_ext_msg* msg, const char* message);
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127
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128 protected:
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129 // For convenience as subclasses use it.
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130 static G1CollectedHeap* _g1h;
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131
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132 virtual HeapRegion* allocate_new_region(size_t word_size, bool force) = 0;
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133 virtual void retire_region(HeapRegion* alloc_region,
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134 size_t allocated_bytes) = 0;
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135
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136 G1AllocRegion(const char* name, bool bot_updates);
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137
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138 public:
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139 static void setup(G1CollectedHeap* g1h, HeapRegion* dummy_region);
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140
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141 HeapRegion* get() const {
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142 HeapRegion * hr = _alloc_region;
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143 // Make sure that the dummy region does not escape this class.
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144 return (hr == _dummy_region) ? NULL : hr;
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145 }
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146
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147 void set_allocation_context(AllocationContext_t context) { _allocation_context = context; }
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148 AllocationContext_t allocation_context() { return _allocation_context; }
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149
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150 uint count() { return _count; }
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151
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152 // The following two are the building blocks for the allocation method.
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153
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154 // First-level allocation: Should be called without holding a
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155 // lock. It will try to allocate lock-free out of the active region,
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156 // or return NULL if it was unable to.
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157 inline HeapWord* attempt_allocation(size_t word_size, bool bot_updates);
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158
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159 // Second-level allocation: Should be called while holding a
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160 // lock. It will try to first allocate lock-free out of the active
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161 // region or, if it's unable to, it will try to replace the active
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162 // alloc region with a new one. We require that the caller takes the
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163 // appropriate lock before calling this so that it is easier to make
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164 // it conform to its locking protocol.
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165 inline HeapWord* attempt_allocation_locked(size_t word_size,
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166 bool bot_updates);
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167
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168 // Should be called to allocate a new region even if the max of this
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169 // type of regions has been reached. Should only be called if other
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170 // allocation attempts have failed and we are not holding a valid
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171 // active region.
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172 inline HeapWord* attempt_allocation_force(size_t word_size,
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173 bool bot_updates);
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174
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175 // Should be called before we start using this object.
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176 void init();
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177
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178 // This can be used to set the active region to a specific
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179 // region. (Use Example: we try to retain the last old GC alloc
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180 // region that we've used during a GC and we can use set() to
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181 // re-instate it at the beginning of the next GC.)
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182 void set(HeapRegion* alloc_region);
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183
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184 // Should be called when we want to release the active region which
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185 // is returned after it's been retired.
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186 virtual HeapRegion* release();
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187
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188 #if G1_ALLOC_REGION_TRACING
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189 void trace(const char* str, size_t word_size = 0, HeapWord* result = NULL);
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190 #else // G1_ALLOC_REGION_TRACING
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191 void trace(const char* str, size_t word_size = 0, HeapWord* result = NULL) { }
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192 #endif // G1_ALLOC_REGION_TRACING
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193 };
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194
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195 class MutatorAllocRegion : public G1AllocRegion {
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196 protected:
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197 virtual HeapRegion* allocate_new_region(size_t word_size, bool force);
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198 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
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199 public:
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200 MutatorAllocRegion()
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201 : G1AllocRegion("Mutator Alloc Region", false /* bot_updates */) { }
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202 };
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203
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204 class SurvivorGCAllocRegion : public G1AllocRegion {
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205 protected:
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206 virtual HeapRegion* allocate_new_region(size_t word_size, bool force);
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207 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
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208 public:
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209 SurvivorGCAllocRegion()
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210 : G1AllocRegion("Survivor GC Alloc Region", false /* bot_updates */) { }
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211 };
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212
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213 class OldGCAllocRegion : public G1AllocRegion {
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214 protected:
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215 virtual HeapRegion* allocate_new_region(size_t word_size, bool force);
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216 virtual void retire_region(HeapRegion* alloc_region, size_t allocated_bytes);
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217 public:
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218 OldGCAllocRegion()
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219 : G1AllocRegion("Old GC Alloc Region", true /* bot_updates */) { }
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220
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221 // This specialization of release() makes sure that the last card that has
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222 // been allocated into has been completely filled by a dummy object. This
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223 // avoids races when remembered set scanning wants to update the BOT of the
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224 // last card in the retained old gc alloc region, and allocation threads
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225 // allocating into that card at the same time.
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226 virtual HeapRegion* release();
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227 };
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228
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229 class ar_ext_msg : public err_msg {
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230 public:
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231 ar_ext_msg(G1AllocRegion* alloc_region, const char *message) : err_msg("%s", "") {
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232 alloc_region->fill_in_ext_msg(this, message);
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233 }
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234 };
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235
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236 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_G1ALLOCREGION_HPP