Mercurial > hg > truffle
annotate src/gpu/hsail/vm/gpu_hsail_Tlab.hpp @ 18429:79268cfc256a
StackSlot is no longer a VirtualStackSlot (rename ForwardingFrameMapBuilder to DelayedFrameMapBuilder).
author | Josef Eisl <josef.eisl@jku.at> |
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date | Wed, 05 Nov 2014 19:18:35 +0100 |
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1 /* |
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2 * Copyright (c) 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 GPU_HSAIL_VM_GPU_HSAIL_TLAB_HPP |
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26 #define GPU_HSAIL_VM_GPU_HSAIL_TLAB_HPP |
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27 |
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28 #include "graal/graalEnv.hpp" |
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29 #include "code/debugInfo.hpp" |
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30 #include "code/location.hpp" |
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31 #include "gpu_hsail.hpp" |
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32 |
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33 class HSAILAllocationInfo; |
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34 |
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35 class HSAILTlabInfo VALUE_OBJ_CLASS_SPEC { |
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36 friend class VMStructs; |
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37 public: |
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38 // uses only the necessary fields from a full TLAB |
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39 HeapWord* _start; |
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40 HeapWord* _top; |
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41 HeapWord* _end; |
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42 HeapWord* _last_good_top; |
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43 HeapWord* _original_top; |
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44 ThreadLocalAllocBuffer* _tlab; // tlab associated with this tlabInfo |
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45 HSAILAllocationInfo* _alloc_info; // same as what is in HSAILDeoptimizationInfo |
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46 |
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47 // Accessors |
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48 HeapWord* start() { return _start; } |
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49 HeapWord* top() { return _top; } |
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50 HeapWord* end() { return _end; } |
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51 HeapWord* last_good_top() { return _last_good_top; } |
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52 HeapWord* original_top() { return _original_top; } |
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53 ThreadLocalAllocBuffer* tlab() { return _tlab; } |
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54 void initialize(HeapWord* start, HeapWord* top, HeapWord* end, ThreadLocalAllocBuffer* tlab, HSAILAllocationInfo* allocInfo) { |
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55 _start = start; |
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56 _top = _original_top = top; |
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57 _end = end; |
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58 _tlab = tlab; |
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59 _alloc_info = allocInfo; |
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60 } |
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61 }; |
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62 |
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63 |
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64 class HSAILAllocationInfo : public CHeapObj<mtInternal> { |
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65 friend class VMStructs; |
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66 private: |
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67 jint _num_tlabs; |
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68 size_t _tlab_align_reserve_bytes; // filled in from ThreadLocalAllocBuffer::alignment_reserve_in_bytes() |
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69 HSAILTlabInfo** _cur_tlab_infos; // array of current tlab info pointers, one per num_tlabs |
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70 HSAILTlabInfo* _tlab_infos_pool_start; // pool for new tlab_infos |
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71 HSAILTlabInfo* _tlab_infos_pool_next; // where next will be allocated from |
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72 HSAILTlabInfo* _tlab_infos_pool_end; // where next will be allocated from |
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73 |
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74 public: |
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75 HSAILAllocationInfo(jint num_tlabs, int dimX, int allocBytesPerWorkitem) { |
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76 _num_tlabs = num_tlabs; |
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77 // if this thread doesn't have gpu_hsail_tlabs allocated yet, do so now |
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78 JavaThread* thread = JavaThread::current(); |
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79 if (thread->get_gpu_hsail_tlabs_count() == 0) { |
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80 thread->initialize_gpu_hsail_tlabs(num_tlabs); |
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81 if (TraceGPUInteraction) { |
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82 for (int i = 0; i < num_tlabs; i++) { |
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83 ThreadLocalAllocBuffer* tlab = thread->get_gpu_hsail_tlab_at(i); |
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84 tty->print("initialized gpu_hsail_tlab %d at %p -> ", i, tlab); |
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85 printTlabInfoFromThread(tlab); |
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86 } |
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87 } |
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88 } |
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89 |
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90 // Compute max_tlab_infos based on amount of free heap space |
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91 size_t max_tlab_infos; |
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92 { |
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93 ThreadLocalAllocBuffer* tlab = &thread->tlab(); |
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94 size_t new_tlab_size = tlab->compute_size(0); |
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95 size_t heap_bytes_free = Universe::heap()->unsafe_max_tlab_alloc(thread); |
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96 if (new_tlab_size != 0) { |
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97 max_tlab_infos = MIN2(heap_bytes_free / new_tlab_size, (size_t)(64 * _num_tlabs)); |
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98 } else { |
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99 max_tlab_infos = 8 * _num_tlabs; // an arbitrary multiple |
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100 } |
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101 if (TraceGPUInteraction) { |
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102 tty->print_cr("heapFree = %ld, newTlabSize=%ld, tlabInfos allocated = %ld", heap_bytes_free, new_tlab_size, max_tlab_infos); |
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103 } |
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104 } |
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105 |
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106 _cur_tlab_infos = NEW_C_HEAP_ARRAY(HSAILTlabInfo*, _num_tlabs, mtInternal); |
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107 _tlab_infos_pool_start = NEW_C_HEAP_ARRAY(HSAILTlabInfo, max_tlab_infos, mtInternal); |
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108 _tlab_infos_pool_next = &_tlab_infos_pool_start[_num_tlabs]; |
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109 _tlab_infos_pool_end = &_tlab_infos_pool_start[max_tlab_infos]; |
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110 _tlab_align_reserve_bytes = ThreadLocalAllocBuffer::alignment_reserve_in_bytes(); |
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111 |
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112 // we will fill the first N tlabInfos from the gpu_hsail_tlabs |
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113 for (int i = 0; i < _num_tlabs; i++) { |
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114 ThreadLocalAllocBuffer* tlab = thread->get_gpu_hsail_tlab_at(i); |
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115 if (TraceGPUInteraction) { |
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116 tty->print("gpu_hsail_tlab %d at %p -> ", i, tlab); |
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117 printTlabInfoFromThread(tlab); |
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118 } |
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119 |
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120 // Here we try to get a new tlab if current one is null. Note: |
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121 // eventually we may want to test if the size is too small based |
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122 // on some heuristic where we see how much this kernel tends to |
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123 // allocate, but for now we can just let it overflow and let the |
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124 // GPU allocate new tlabs. Actually, if we can't prime a tlab |
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125 // here, it might make sense to do a gc now rather than to start |
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126 // the kernel and have it deoptimize. How to do that? |
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127 if (tlab->end() == NULL) { |
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128 bool success = getNewGpuHsailTlab(tlab); |
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129 if (TraceGPUInteraction) { |
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130 if (success) { |
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131 tty->print("gpu_hsail_tlab %d, refilled tlab, -> ", i); |
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132 printTlabInfoFromThread(tlab); |
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133 } else { |
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134 tty->print("gpu_hsail_tlab %d, could not refill tlab, left as ", i); |
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135 printTlabInfoFromThread(tlab); |
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136 } |
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137 } |
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138 } |
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139 |
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140 // extract the necessary tlab fields into a TlabInfo record |
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141 HSAILTlabInfo* pTlabInfo = &_tlab_infos_pool_start[i]; |
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142 _cur_tlab_infos[i] = pTlabInfo; |
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143 pTlabInfo->initialize(tlab->start(), tlab->top(), tlab->end(), tlab, this); |
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144 } |
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145 } |
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146 |
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147 ~HSAILAllocationInfo() { |
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148 FREE_C_HEAP_ARRAY(HSAILTlabInfo*, _cur_tlab_infos, mtInternal); |
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149 FREE_C_HEAP_ARRAY(HSAILTlabInfo, _tlab_infos_pool_start, mtInternal); |
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150 } |
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151 |
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152 void postKernelCleanup() { |
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153 // go thru all the tlabInfos, fix up any tlab tops that overflowed |
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154 // complete the tlabs if they overflowed |
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155 // update the gpu_hsail_tlabs when appropriate |
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156 bool anyOverflows = false; |
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157 size_t bytesAllocated = 0; |
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158 // if there was an overflow in allocating tlabInfos, correct it here |
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159 if (_tlab_infos_pool_next > _tlab_infos_pool_end) { |
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160 if (TraceGPUInteraction) { |
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161 int overflowAmount = _tlab_infos_pool_next - _tlab_infos_pool_end; |
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162 tty->print_cr("tlabInfo allocation overflowed by %d units", overflowAmount); |
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163 } |
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164 _tlab_infos_pool_next = _tlab_infos_pool_end; |
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165 } |
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166 for (HSAILTlabInfo* tlabInfo = _tlab_infos_pool_start; tlabInfo < _tlab_infos_pool_next; tlabInfo++) { |
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167 if (TraceGPUInteraction) { |
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168 tty->print_cr("postprocess tlabInfo %p, start=%p, top=%p, end=%p, last_good_top=%p", tlabInfo, |
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169 tlabInfo->start(), tlabInfo->top(), tlabInfo->end(), tlabInfo->last_good_top()); |
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170 } |
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171 ThreadLocalAllocBuffer* tlab = tlabInfo->tlab(); |
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172 bool overflowed = false; |
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173 // if a tlabInfo has NULL fields, i.e. we could not prime it on entry, |
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174 // or we could not get a tlab from the gpu, so ignore tlabInfo here |
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175 if (tlabInfo->start() != NULL) { |
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176 if (tlabInfo->top() > tlabInfo->end()) { |
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177 anyOverflows = true; |
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178 overflowed = true; |
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179 if (TraceGPUInteraction) { |
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180 long overflowAmount = (long) tlabInfo->top() - (long) tlabInfo->last_good_top(); |
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181 tty->print_cr("tlabInfo %p (tlab = %p) overflowed by %ld bytes, setting last good top to %p", tlabInfo, tlab, overflowAmount, tlabInfo->last_good_top()); |
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182 } |
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183 tlabInfo->_top = tlabInfo->last_good_top(); |
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184 } |
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185 |
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186 // fill the gpu_hsail_tlab with the tlabInfo information |
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187 // we do this even if it will get overwritten by a later tlabinfo |
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188 // because it helps with tlab statistics for that tlab |
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189 tlab->fill(tlabInfo->start(), tlabInfo->top(), (tlabInfo->end() - tlabInfo->start()) + tlab->alignment_reserve()); |
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190 |
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191 // if there was an overflow, make it parsable with retire = true |
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192 if (overflowed) { |
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193 tlab->make_parsable(true); |
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194 } |
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195 |
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196 size_t delta = (long)(tlabInfo->top()) - (long)(tlabInfo->original_top()); |
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197 if (TraceGPUInteraction) { |
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198 tty->print_cr("%ld bytes were allocated by tlabInfo %p (start %p, top %p, end %p", delta, tlabInfo, |
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199 tlabInfo->start(), tlabInfo->top(), tlabInfo->end()); |
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200 } |
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201 bytesAllocated += delta; |
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202 } |
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203 } |
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204 if (TraceGPUInteraction) { |
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205 tty->print_cr("%ld total bytes were allocated in this kernel", bytesAllocated); |
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206 } |
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207 if (anyOverflows) { |
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208 // Hsail::kernelStats.incOverflows(); |
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209 } |
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210 } |
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211 |
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212 HSAILTlabInfo** getCurTlabInfos() { |
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213 return _cur_tlab_infos; |
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214 } |
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215 |
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216 private: |
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217 // fill and retire old tlab and get a new one |
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218 // if we can't get one, no problem someone will eventually do a gc |
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219 bool getNewGpuHsailTlab(ThreadLocalAllocBuffer* tlab) { |
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220 |
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221 tlab->clear_before_allocation(); // fill and retire old tlab (will also check for null) |
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222 |
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223 // get a size for a new tlab that is based on the desired_size |
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224 size_t new_tlab_size = tlab->compute_size(0); |
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225 if (new_tlab_size == 0) return false; |
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226 |
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227 HeapWord* tlab_start = Universe::heap()->allocate_new_tlab(new_tlab_size); |
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228 if (tlab_start == NULL) return false; |
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229 |
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230 // ..and clear it if required |
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231 if (ZeroTLAB) { |
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232 Copy::zero_to_words(tlab_start, new_tlab_size); |
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233 } |
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234 // and init the tlab pointers |
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235 tlab->fill(tlab_start, tlab_start, new_tlab_size); |
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236 return true; |
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237 } |
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238 |
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239 void printTlabInfoFromThread (ThreadLocalAllocBuffer* tlab) { |
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240 HeapWord* start = tlab->start(); |
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241 HeapWord* top = tlab->top(); |
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242 HeapWord* end = tlab->end(); |
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243 // sizes are in bytes |
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244 size_t tlabFree = tlab->free() * HeapWordSize; |
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245 size_t tlabUsed = tlab->used() * HeapWordSize; |
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246 size_t tlabSize = tlabFree + tlabUsed; |
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247 double freePct = 100.0 * (double) tlabFree/(double) tlabSize; |
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248 tty->print_cr("(%p, %p, %p), siz=%ld, free=%ld (%f%%)", start, top, end, tlabSize, tlabFree, freePct); |
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249 } |
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250 |
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251 }; |
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252 |
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253 #endif // GPU_HSAIL_VM_GPU_HSAIL_TLAB_HPP |