1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Deterministic Priority Affinity SMP Scheduler Implementation |
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5 | * |
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6 | * @ingroup ScoreSchedulerPriorityAffinitySMP |
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7 | */ |
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8 | |
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9 | /* |
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10 | * COPYRIGHT (c) 2014. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.rtems.org/license/LICENSE. |
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16 | */ |
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17 | |
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18 | #if HAVE_CONFIG_H |
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19 | #include "config.h" |
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20 | #endif |
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21 | |
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22 | #include <rtems/score/schedulerpriorityaffinitysmp.h> |
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23 | #include <rtems/score/schedulerpriorityimpl.h> |
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24 | #include <rtems/score/schedulersmpimpl.h> |
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25 | #include <rtems/score/schedulerprioritysmpimpl.h> |
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26 | #include <rtems/score/priority.h> |
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27 | |
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28 | /* |
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29 | * The following methods which initially were static in schedulerprioritysmp.c |
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30 | * are shared with this scheduler. They are now public so they can be shared. |
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31 | * |
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32 | * + _Scheduler_priority_SMP_Get_self |
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33 | * + _Scheduler_priority_SMP_Insert_ready_fifo |
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34 | * + _Scheduler_priority_SMP_Insert_ready_lifo |
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35 | * + _Scheduler_priority_SMP_Thread_get_node |
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36 | * + _Scheduler_priority_SMP_Move_from_scheduled_to_ready |
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37 | * + _Scheduler_priority_SMP_Move_from_ready_to_scheduled |
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38 | * + _Scheduler_priority_SMP_Extract_from_ready |
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39 | * + _Scheduler_priority_SMP_Do_update |
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40 | */ |
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41 | |
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42 | static bool _Scheduler_priority_affinity_SMP_Priority_less_equal( |
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43 | const void *to_insert, |
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44 | const Chain_Node *next |
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45 | ) |
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46 | { |
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47 | return next != NULL |
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48 | && _Scheduler_SMP_Priority_less_equal( to_insert, next ); |
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49 | } |
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50 | |
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51 | static Scheduler_priority_affinity_SMP_Node * |
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52 | _Scheduler_priority_affinity_SMP_Node_downcast( |
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53 | Scheduler_Node *node |
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54 | ) |
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55 | { |
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56 | return (Scheduler_priority_affinity_SMP_Node *) node; |
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57 | } |
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58 | |
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59 | /* |
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60 | * This method initializes the scheduler control information for |
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61 | * this scheduler instance. |
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62 | */ |
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63 | void _Scheduler_priority_affinity_SMP_Node_initialize( |
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64 | const Scheduler_Control *scheduler, |
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65 | Scheduler_Node *node, |
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66 | Thread_Control *the_thread, |
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67 | Priority_Control priority |
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68 | ) |
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69 | { |
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70 | Scheduler_priority_affinity_SMP_Node *the_node; |
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71 | |
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72 | _Scheduler_priority_SMP_Node_initialize( scheduler, node, the_thread, priority ); |
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73 | |
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74 | /* |
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75 | * All we add is affinity information to the basic SMP node. |
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76 | */ |
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77 | the_node = _Scheduler_priority_affinity_SMP_Node_downcast( node ); |
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78 | _Processor_mask_Assign( &the_node->Affinity, _SMP_Get_online_processors() ); |
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79 | } |
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80 | |
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81 | /* |
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82 | * This method is unique to this scheduler because it takes into |
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83 | * account affinity as it determines the highest ready thread. |
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84 | * Since this is used to pick a new thread to replace the victim, |
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85 | * the highest ready thread must have affinity such that it can |
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86 | * be executed on the victim's processor. |
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87 | */ |
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88 | static Scheduler_Node *_Scheduler_priority_affinity_SMP_Get_highest_ready( |
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89 | Scheduler_Context *context, |
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90 | Scheduler_Node *victim |
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91 | ) |
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92 | { |
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93 | Scheduler_priority_SMP_Context *self = |
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94 | _Scheduler_priority_SMP_Get_self( context ); |
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95 | Priority_Control index; |
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96 | Scheduler_Node *highest = NULL; |
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97 | Thread_Control *victim_thread; |
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98 | uint32_t victim_cpu_index; |
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99 | Scheduler_priority_affinity_SMP_Node *node; |
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100 | |
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101 | /* |
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102 | * This is done when we need to check if reevaluations are needed. |
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103 | */ |
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104 | if ( victim == NULL ) { |
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105 | node = (Scheduler_priority_affinity_SMP_Node *) |
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106 | _Scheduler_priority_Ready_queue_first( |
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107 | &self->Bit_map, |
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108 | &self->Ready[ 0 ] |
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109 | ); |
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110 | |
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111 | return &node->Base.Base.Base; |
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112 | } |
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113 | |
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114 | victim_thread = _Scheduler_Node_get_owner( victim ); |
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115 | victim_cpu_index = _Per_CPU_Get_index( _Thread_Get_CPU( victim_thread ) ); |
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116 | |
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117 | /** |
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118 | * @todo The deterministic priority scheduler structure is optimized |
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119 | * for insertion, extraction, and finding the highest priority |
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120 | * thread. Scanning the list of ready threads is not a purpose |
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121 | * for which it was optimized. There are optimizations to be |
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122 | * made in this loop. |
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123 | * |
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124 | * + by checking the major bit, we could potentially skip entire |
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125 | * groups of 16. |
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126 | * |
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127 | * When using this scheduler as implemented, the application's |
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128 | * choice of numeric priorities and their distribution can have |
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129 | * an impact on performance. |
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130 | */ |
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131 | for ( index = _Priority_bit_map_Get_highest( &self->Bit_map ) ; |
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132 | index <= PRIORITY_MAXIMUM; |
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133 | index++ ) |
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134 | { |
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135 | Chain_Control *chain = &self->Ready[index]; |
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136 | Chain_Node *chain_node; |
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137 | for ( chain_node = _Chain_First( chain ); |
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138 | chain_node != _Chain_Immutable_tail( chain ) ; |
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139 | chain_node = _Chain_Next( chain_node ) ) |
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140 | { |
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141 | node = (Scheduler_priority_affinity_SMP_Node *) chain_node; |
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142 | |
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143 | /* |
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144 | * Can this thread run on this CPU? |
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145 | */ |
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146 | if ( _Processor_mask_Is_set( &node->Affinity, victim_cpu_index ) ) { |
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147 | highest = &node->Base.Base.Base; |
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148 | break; |
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149 | } |
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150 | } |
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151 | if ( highest ) |
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152 | break; |
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153 | } |
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154 | |
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155 | _Assert( highest != NULL ); |
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156 | |
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157 | return highest; |
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158 | } |
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159 | |
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160 | /* |
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161 | * This method is very similar to _Scheduler_priority_affinity_SMP_Block |
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162 | * but has the difference that is invokes this scheduler's |
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163 | * get_highest_ready() support method. |
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164 | */ |
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165 | void _Scheduler_priority_affinity_SMP_Block( |
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166 | const Scheduler_Control *scheduler, |
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167 | Thread_Control *thread, |
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168 | Scheduler_Node *node |
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169 | ) |
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170 | { |
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171 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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172 | |
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173 | _Scheduler_SMP_Block( |
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174 | context, |
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175 | thread, |
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176 | node, |
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177 | _Scheduler_priority_SMP_Extract_from_ready, |
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178 | _Scheduler_priority_affinity_SMP_Get_highest_ready, |
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179 | _Scheduler_priority_SMP_Move_from_ready_to_scheduled, |
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180 | _Scheduler_SMP_Allocate_processor_exact |
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181 | ); |
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182 | |
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183 | /* |
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184 | * Since this removed a single thread from the scheduled set |
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185 | * and selected the most appropriate thread from the ready |
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186 | * set to replace it, there should be no need for thread |
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187 | * migrations. |
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188 | */ |
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189 | } |
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190 | |
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191 | /* |
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192 | * This method is unique to this scheduler because it must take into |
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193 | * account affinity as it searches for the lowest priority scheduled |
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194 | * thread. It ignores those which cannot be replaced by the filter |
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195 | * thread because the potential victim thread does not have affinity |
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196 | * for that processor. |
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197 | */ |
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198 | static Scheduler_Node * _Scheduler_priority_affinity_SMP_Get_lowest_scheduled( |
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199 | Scheduler_Context *context, |
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200 | Scheduler_Node *filter_base |
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201 | ) |
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202 | { |
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203 | Scheduler_SMP_Context *self = _Scheduler_SMP_Get_self( context ); |
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204 | Scheduler_Node *lowest_scheduled = NULL; |
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205 | Chain_Control *scheduled = &self->Scheduled; |
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206 | Chain_Node *chain_node; |
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207 | Scheduler_priority_affinity_SMP_Node *filter = |
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208 | _Scheduler_priority_affinity_SMP_Node_downcast( filter_base ); |
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209 | |
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210 | for ( chain_node = _Chain_Last( scheduled ); |
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211 | chain_node != _Chain_Immutable_head( scheduled ) ; |
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212 | chain_node = _Chain_Previous( chain_node ) ) { |
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213 | Scheduler_priority_affinity_SMP_Node *node; |
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214 | Thread_Control *thread; |
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215 | uint32_t cpu_index; |
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216 | |
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217 | node = (Scheduler_priority_affinity_SMP_Node *) chain_node; |
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218 | |
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219 | /* cpu_index is the processor number thread is executing on */ |
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220 | thread = _Scheduler_Node_get_owner( &node->Base.Base.Base ); |
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221 | cpu_index = _Per_CPU_Get_index( _Thread_Get_CPU( thread ) ); |
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222 | |
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223 | if ( _Processor_mask_Is_set( &filter->Affinity, cpu_index ) ) { |
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224 | lowest_scheduled = &node->Base.Base.Base; |
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225 | break; |
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226 | } |
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227 | |
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228 | } |
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229 | |
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230 | return lowest_scheduled; |
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231 | } |
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232 | |
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233 | /* |
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234 | * This method is unique to this scheduler because it must pass |
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235 | * _Scheduler_priority_affinity_SMP_Get_lowest_scheduled into |
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236 | * _Scheduler_SMP_Enqueue. |
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237 | */ |
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238 | static bool _Scheduler_priority_affinity_SMP_Enqueue_fifo( |
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239 | Scheduler_Context *context, |
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240 | Scheduler_Node *node, |
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241 | Priority_Control insert_priority |
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242 | ) |
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243 | { |
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244 | return _Scheduler_SMP_Enqueue( |
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245 | context, |
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246 | node, |
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247 | insert_priority, |
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248 | _Scheduler_priority_affinity_SMP_Priority_less_equal, |
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249 | _Scheduler_priority_SMP_Insert_ready, |
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250 | _Scheduler_SMP_Insert_scheduled, |
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251 | _Scheduler_priority_SMP_Move_from_scheduled_to_ready, |
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252 | _Scheduler_priority_affinity_SMP_Get_lowest_scheduled, |
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253 | _Scheduler_SMP_Allocate_processor_exact |
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254 | ); |
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255 | } |
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256 | |
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257 | /* |
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258 | * This method is invoked at the end of certain scheduling operations |
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259 | * to ensure that the highest priority ready thread cannot be scheduled |
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260 | * to execute. When we schedule with affinity, there is the possibility |
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261 | * that we need to migrate a thread to another core to ensure that the |
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262 | * highest priority ready threads are in fact scheduled. |
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263 | */ |
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264 | static void _Scheduler_priority_affinity_SMP_Check_for_migrations( |
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265 | Scheduler_Context *context |
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266 | ) |
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267 | { |
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268 | Scheduler_priority_SMP_Context *self; |
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269 | Scheduler_Node *lowest_scheduled; |
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270 | Scheduler_Node *highest_ready; |
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271 | |
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272 | self = _Scheduler_priority_SMP_Get_self( context ); |
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273 | |
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274 | while (1) { |
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275 | Priority_Control lowest_scheduled_priority; |
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276 | Priority_Control insert_priority; |
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277 | |
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278 | if ( _Priority_bit_map_Is_empty( &self->Bit_map ) ) { |
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279 | /* Nothing to do */ |
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280 | break; |
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281 | } |
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282 | |
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283 | highest_ready = |
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284 | _Scheduler_priority_affinity_SMP_Get_highest_ready( context, NULL ); |
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285 | |
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286 | lowest_scheduled = |
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287 | _Scheduler_priority_affinity_SMP_Get_lowest_scheduled( |
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288 | context, |
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289 | highest_ready |
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290 | ); |
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291 | |
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292 | /* |
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293 | * If we can't find a thread to displace from the scheduled set, |
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294 | * then we have placed all the highest priority threads possible |
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295 | * in the scheduled set. |
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296 | * |
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297 | * We found the absolute highest priority thread without |
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298 | * considering affinity. But now we have to consider that thread's |
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299 | * affinity as we look to place it. |
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300 | */ |
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301 | |
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302 | if ( lowest_scheduled == NULL ) |
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303 | break; |
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304 | |
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305 | lowest_scheduled_priority = |
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306 | _Scheduler_SMP_Node_priority( lowest_scheduled ); |
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307 | |
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308 | if ( |
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309 | _Scheduler_SMP_Priority_less_equal( |
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310 | &lowest_scheduled_priority, |
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311 | &highest_ready->Node.Chain |
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312 | ) |
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313 | ) { |
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314 | break; |
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315 | } |
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316 | |
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317 | /* |
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318 | * But if we found a thread which is lower priority than one |
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319 | * in the ready set, then we need to swap them out. |
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320 | */ |
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321 | |
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322 | _Scheduler_priority_SMP_Extract_from_ready( context, highest_ready ); |
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323 | insert_priority = _Scheduler_SMP_Node_priority( highest_ready ); |
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324 | insert_priority = SCHEDULER_PRIORITY_APPEND( insert_priority ); |
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325 | _Scheduler_SMP_Enqueue_to_scheduled( |
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326 | context, |
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327 | highest_ready, |
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328 | insert_priority, |
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329 | lowest_scheduled, |
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330 | _Scheduler_SMP_Insert_scheduled, |
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331 | _Scheduler_priority_SMP_Move_from_scheduled_to_ready, |
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332 | _Scheduler_SMP_Allocate_processor_exact |
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333 | ); |
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334 | } |
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335 | } |
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336 | |
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337 | /* |
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338 | * This is the public scheduler specific Unblock operation. |
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339 | */ |
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340 | void _Scheduler_priority_affinity_SMP_Unblock( |
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341 | const Scheduler_Control *scheduler, |
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342 | Thread_Control *thread, |
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343 | Scheduler_Node *node |
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344 | ) |
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345 | { |
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346 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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347 | |
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348 | _Scheduler_SMP_Unblock( |
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349 | context, |
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350 | thread, |
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351 | node, |
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352 | _Scheduler_priority_SMP_Do_update, |
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353 | _Scheduler_priority_affinity_SMP_Enqueue_fifo |
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354 | ); |
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355 | |
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356 | /* |
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357 | * Perform any thread migrations that are needed due to these changes. |
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358 | */ |
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359 | _Scheduler_priority_affinity_SMP_Check_for_migrations( context ); |
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360 | } |
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361 | |
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362 | /* |
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363 | * This is unique to this scheduler because it passes scheduler specific |
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364 | * get_lowest_scheduled helper to _Scheduler_SMP_Enqueue. |
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365 | */ |
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366 | static bool _Scheduler_priority_affinity_SMP_Enqueue( |
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367 | Scheduler_Context *context, |
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368 | Scheduler_Node *node, |
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369 | Priority_Control insert_priority |
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370 | ) |
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371 | { |
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372 | return _Scheduler_SMP_Enqueue( |
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373 | context, |
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374 | node, |
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375 | insert_priority, |
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376 | _Scheduler_priority_affinity_SMP_Priority_less_equal, |
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377 | _Scheduler_priority_SMP_Insert_ready, |
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378 | _Scheduler_SMP_Insert_scheduled, |
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379 | _Scheduler_priority_SMP_Move_from_scheduled_to_ready, |
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380 | _Scheduler_priority_affinity_SMP_Get_lowest_scheduled, |
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381 | _Scheduler_SMP_Allocate_processor_exact |
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382 | ); |
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383 | } |
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384 | |
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385 | /* |
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386 | * This method is unique to this scheduler because it must |
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387 | * invoke _Scheduler_SMP_Enqueue_scheduled() with |
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388 | * this scheduler's get_highest_ready() helper. |
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389 | */ |
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390 | static bool _Scheduler_priority_affinity_SMP_Enqueue_scheduled( |
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391 | Scheduler_Context *context, |
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392 | Scheduler_Node *node, |
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393 | Priority_Control insert_priority |
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394 | ) |
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395 | { |
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396 | return _Scheduler_SMP_Enqueue_scheduled( |
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397 | context, |
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398 | node, |
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399 | insert_priority, |
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400 | _Scheduler_SMP_Priority_less_equal, |
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401 | _Scheduler_priority_SMP_Extract_from_ready, |
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402 | _Scheduler_priority_affinity_SMP_Get_highest_ready, |
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403 | _Scheduler_priority_SMP_Insert_ready, |
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404 | _Scheduler_SMP_Insert_scheduled, |
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405 | _Scheduler_priority_SMP_Move_from_ready_to_scheduled, |
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406 | _Scheduler_SMP_Allocate_processor_exact |
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407 | ); |
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408 | } |
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409 | |
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410 | static bool _Scheduler_priority_affinity_SMP_Do_ask_for_help( |
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411 | Scheduler_Context *context, |
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412 | Thread_Control *the_thread, |
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413 | Scheduler_Node *node |
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414 | ) |
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415 | { |
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416 | return _Scheduler_SMP_Ask_for_help( |
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417 | context, |
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418 | the_thread, |
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419 | node, |
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420 | _Scheduler_SMP_Priority_less_equal, |
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421 | _Scheduler_priority_SMP_Insert_ready, |
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422 | _Scheduler_SMP_Insert_scheduled, |
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423 | _Scheduler_priority_SMP_Move_from_scheduled_to_ready, |
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424 | _Scheduler_SMP_Get_lowest_scheduled, |
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425 | _Scheduler_SMP_Allocate_processor_lazy |
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426 | ); |
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427 | } |
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428 | |
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429 | void _Scheduler_priority_affinity_SMP_Update_priority( |
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430 | const Scheduler_Control *scheduler, |
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431 | Thread_Control *thread, |
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432 | Scheduler_Node *node |
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433 | ) |
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434 | { |
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435 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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436 | |
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437 | _Scheduler_SMP_Update_priority( |
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438 | context, |
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439 | thread, |
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440 | node, |
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441 | _Scheduler_priority_SMP_Extract_from_ready, |
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442 | _Scheduler_priority_SMP_Do_update, |
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443 | _Scheduler_priority_affinity_SMP_Enqueue, |
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444 | _Scheduler_priority_affinity_SMP_Enqueue_scheduled, |
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445 | _Scheduler_priority_affinity_SMP_Do_ask_for_help |
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446 | ); |
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447 | |
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448 | /* |
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449 | * Perform any thread migrations that are needed due to these changes. |
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450 | */ |
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451 | _Scheduler_priority_affinity_SMP_Check_for_migrations( context ); |
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452 | } |
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453 | |
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454 | bool _Scheduler_priority_affinity_SMP_Ask_for_help( |
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455 | const Scheduler_Control *scheduler, |
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456 | Thread_Control *the_thread, |
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457 | Scheduler_Node *node |
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458 | ) |
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459 | { |
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460 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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461 | |
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462 | return _Scheduler_priority_affinity_SMP_Do_ask_for_help( context, the_thread, node ); |
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463 | } |
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464 | |
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465 | void _Scheduler_priority_affinity_SMP_Reconsider_help_request( |
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466 | const Scheduler_Control *scheduler, |
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467 | Thread_Control *the_thread, |
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468 | Scheduler_Node *node |
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469 | ) |
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470 | { |
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471 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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472 | |
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473 | _Scheduler_SMP_Reconsider_help_request( |
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474 | context, |
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475 | the_thread, |
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476 | node, |
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477 | _Scheduler_priority_SMP_Extract_from_ready |
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478 | ); |
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479 | } |
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480 | |
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481 | void _Scheduler_priority_affinity_SMP_Withdraw_node( |
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482 | const Scheduler_Control *scheduler, |
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483 | Thread_Control *the_thread, |
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484 | Scheduler_Node *node, |
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485 | Thread_Scheduler_state next_state |
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486 | ) |
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487 | { |
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488 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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489 | |
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490 | _Scheduler_SMP_Withdraw_node( |
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491 | context, |
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492 | the_thread, |
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493 | node, |
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494 | next_state, |
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495 | _Scheduler_priority_SMP_Extract_from_ready, |
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496 | _Scheduler_priority_affinity_SMP_Get_highest_ready, |
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497 | _Scheduler_priority_SMP_Move_from_ready_to_scheduled, |
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498 | _Scheduler_SMP_Allocate_processor_lazy |
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499 | ); |
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500 | } |
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501 | |
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502 | void _Scheduler_priority_affinity_SMP_Add_processor( |
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503 | const Scheduler_Control *scheduler, |
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504 | Thread_Control *idle |
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505 | ) |
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506 | { |
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507 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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508 | |
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509 | _Scheduler_SMP_Add_processor( |
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510 | context, |
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511 | idle, |
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512 | _Scheduler_priority_SMP_Has_ready, |
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513 | _Scheduler_priority_affinity_SMP_Enqueue_scheduled, |
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514 | _Scheduler_SMP_Do_nothing_register_idle |
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515 | ); |
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516 | } |
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517 | |
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518 | Thread_Control *_Scheduler_priority_affinity_SMP_Remove_processor( |
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519 | const Scheduler_Control *scheduler, |
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520 | Per_CPU_Control *cpu |
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521 | ) |
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522 | { |
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523 | Scheduler_Context *context = _Scheduler_Get_context( scheduler ); |
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524 | |
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525 | return _Scheduler_SMP_Remove_processor( |
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526 | context, |
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527 | cpu, |
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528 | _Scheduler_priority_SMP_Extract_from_ready, |
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529 | _Scheduler_priority_affinity_SMP_Enqueue |
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530 | ); |
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531 | } |
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532 | |
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533 | bool _Scheduler_priority_affinity_SMP_Set_affinity( |
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534 | const Scheduler_Control *scheduler, |
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535 | Thread_Control *thread, |
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536 | Scheduler_Node *node_base, |
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537 | const Processor_mask *affinity |
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538 | ) |
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539 | { |
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540 | Scheduler_Context *context; |
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541 | Scheduler_priority_affinity_SMP_Node *node; |
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542 | States_Control current_state; |
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543 | Processor_mask my_affinity; |
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544 | |
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545 | context = _Scheduler_Get_context( scheduler ); |
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546 | _Processor_mask_And( &my_affinity, &context->Processors, affinity ); |
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547 | |
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548 | if ( _Processor_mask_Count( &my_affinity ) == 0 ) { |
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549 | return false; |
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550 | } |
---|
551 | |
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552 | node = _Scheduler_priority_affinity_SMP_Node_downcast( node_base ); |
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553 | |
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554 | /* |
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555 | * The old and new set are the same, there is no point in |
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556 | * doing anything. |
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557 | */ |
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558 | if ( _Processor_mask_Is_equal( &node->Affinity, affinity ) ) |
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559 | return true; |
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560 | |
---|
561 | current_state = thread->current_state; |
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562 | |
---|
563 | if ( _States_Is_ready( current_state ) ) { |
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564 | _Scheduler_priority_affinity_SMP_Block( scheduler, thread, &node->Base.Base.Base ); |
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565 | } |
---|
566 | |
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567 | _Processor_mask_Assign( &node->Affinity, affinity ); |
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568 | |
---|
569 | if ( _States_Is_ready( current_state ) ) { |
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570 | /* |
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571 | * FIXME: Do not ignore threads in need for help. |
---|
572 | */ |
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573 | (void) _Scheduler_priority_affinity_SMP_Unblock( scheduler, thread, &node->Base.Base.Base ); |
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574 | } |
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575 | |
---|
576 | return true; |
---|
577 | } |
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