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annotate src/gpu/hsail/vm/gpu_hsail_Tlab.hpp @ 16795:a29e6e7b7a86

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Replace hsail donor threads with hsail tlabs
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Tue, 12 Aug 2014 16:30:17 -0700
parents f1d1ec9bcf24
children 82e5b5ccdb0c
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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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diff changeset
224 size_t new_tlab_size = tlab->compute_size(0);
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diff changeset
225 if (new_tlab_size == 0) return false;
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diff changeset
226
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diff changeset
227 HeapWord* tlab_start = Universe::heap()->allocate_new_tlab(new_tlab_size);
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diff changeset
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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diff changeset
232 Copy::zero_to_words(tlab_start, new_tlab_size);
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diff changeset
233 }
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diff changeset
234 // and init the tlab pointers
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diff changeset
235 tlab->fill(tlab_start, tlab_start, new_tlab_size);
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diff changeset
236 return true;
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diff changeset
237 }
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diff changeset
238
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diff changeset
239 void printTlabInfoFromThread (ThreadLocalAllocBuffer* tlab) {
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diff changeset
240 HeapWord* start = tlab->start();
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diff changeset
241 HeapWord* top = tlab->top();
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diff changeset
242 HeapWord* end = tlab->end();
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diff changeset
243 // sizes are in bytes
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diff changeset
244 size_t tlabFree = tlab->free() * HeapWordSize;
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diff changeset
245 size_t tlabUsed = tlab->used() * HeapWordSize;
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diff changeset
246 size_t tlabSize = tlabFree + tlabUsed;
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diff changeset
247 double freePct = 100.0 * (double) tlabFree/(double) tlabSize;
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diff changeset
248 tty->print_cr("(%p, %p, %p), siz=%ld, free=%ld (%f%%)", start, top, end, tlabSize, tlabFree, freePct);
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diff changeset
249 }
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250
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diff changeset
251 };
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252
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diff changeset
253 #endif // GPU_HSAIL_VM_GPU_HSAIL_TLAB_HPP