1 | /* |
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2 | * dqdt.c - Distributed Quaternary Decision Tree implementation. |
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3 | * |
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4 | * Author : Alain Greiner (2016,2017,2018) |
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5 | * |
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6 | * Copyright (c) UPMC Sorbonne Universites |
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7 | * |
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8 | * This file is part of ALMOS-MKH. |
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9 | * |
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10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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11 | * under the terms of the GNU General Public License as published by |
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12 | * the Free Software Foundation; version 2.0 of the License. |
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13 | * |
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14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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17 | * General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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22 | */ |
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23 | |
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24 | #include <kernel_config.h> |
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25 | #include <hal_kernel_types.h> |
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26 | #include <hal_special.h> |
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27 | #include <hal_macros.h> |
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28 | #include <hal_atomic.h> |
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29 | #include <hal_remote.h> |
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30 | #include <thread.h> |
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31 | #include <printk.h> |
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32 | #include <chdev.h> |
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33 | #include <cluster.h> |
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34 | #include <bits.h> |
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35 | #include <dqdt.h> |
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36 | |
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37 | |
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38 | /////////////////////////////////////////////////////////////////////////////////////////// |
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39 | // Extern variables |
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40 | /////////////////////////////////////////////////////////////////////////////////////////// |
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41 | |
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42 | extern chdev_directory_t chdev_dir; // defined in chdev.h / allocated in kernel_init.c |
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43 | |
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44 | /////////////////////////////////////////////////////////////////////////////////////////// |
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45 | // This static recursive function traverse the DQDT quad-tree from root to bottom. |
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46 | /////////////////////////////////////////////////////////////////////////////////////////// |
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47 | static void dqdt_recursive_print( xptr_t node_xp ) |
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48 | { |
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49 | uint32_t x; |
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50 | uint32_t y; |
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51 | dqdt_node_t node; |
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52 | |
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53 | // get node local copy |
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54 | hal_remote_memcpy( XPTR( local_cxy , &node ), node_xp , sizeof(dqdt_node_t) ); |
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55 | |
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56 | // display node content |
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57 | nolock_printk("- level %d / cluster %x : threads = %x / pages = %x / clusters %d / cores %d\n", |
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58 | node.level, GET_CXY( node_xp ), node.threads, node.pages, node.clusters, node.cores ); |
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59 | |
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60 | // recursive call on children if node is not terminal |
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61 | if ( node.level > 0 ) |
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62 | { |
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63 | for ( x = 0 ; x < 2 ; x++ ) |
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64 | { |
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65 | for ( y = 0 ; y < 2 ; y++ ) |
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66 | { |
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67 | xptr_t iter_xp = node.children[x][y]; |
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68 | if ( iter_xp != XPTR_NULL ) dqdt_recursive_print( iter_xp ); |
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69 | } |
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70 | } |
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71 | } |
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72 | } |
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73 | |
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74 | ///////////////////////// |
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75 | void dqdt_display( void ) |
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76 | { |
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77 | // get extended pointer on DQDT root node |
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78 | cluster_t * cluster = &cluster_manager; |
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79 | xptr_t root_xp = cluster->dqdt_root_xp; |
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80 | |
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81 | // get pointers on TXT0 chdev |
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82 | xptr_t txt0_xp = chdev_dir.txt_tx[0]; |
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83 | cxy_t txt0_cxy = GET_CXY( txt0_xp ); |
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84 | chdev_t * txt0_ptr = GET_PTR( txt0_xp ); |
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85 | |
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86 | // get extended pointer on remote TXT0 lock |
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87 | xptr_t lock_xp = XPTR( txt0_cxy , &txt0_ptr->wait_lock ); |
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88 | |
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89 | // get TXT0 lock |
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90 | remote_busylock_acquire( lock_xp ); |
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91 | |
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92 | // print header |
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93 | nolock_printk("\n***** DQDT state\n\n"); |
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94 | |
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95 | // call recursive function |
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96 | dqdt_recursive_print( root_xp ); |
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97 | |
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98 | // release TXT0 lock |
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99 | remote_busylock_release( lock_xp ); |
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100 | } |
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101 | |
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102 | /////////////////////////////////////////////////////////////////////////////////////// |
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103 | // This static function initializes recursively, from top to bottom, the quad-tree |
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104 | // infrastructure. The DQDT nodes are allocated as global variables in each local |
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105 | // cluster manager. At each level in the quad-tree, this function initializes the |
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106 | // node identified by the <cxy> and <level> arguments, selects in each child |
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107 | // macro-cluster the precise cluster where will be placed the subtree root node, |
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108 | // and call recursively itself to initialize the child node in the selected cluster. |
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109 | /////////////////////////////////////////////////////////////////////////////////////// |
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110 | // @ node cxy : cluster containing the node to initialize |
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111 | // @ level : level of node to be initialised |
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112 | // @ parent_xp : extended pointer on the parent node |
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113 | /////////////////////////////////////////////////////////////////////////////////////// |
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114 | static void dqdt_recursive_build( cxy_t node_cxy, |
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115 | uint32_t level, |
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116 | xptr_t parent_xp ) |
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117 | { |
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118 | assert( (level < 5) , __FUNCTION__, "illegal DQDT level %d\n", level ); |
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119 | |
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120 | uint32_t node_x; // node X coordinate |
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121 | uint32_t node_y; // node Y coordinate |
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122 | uint32_t mask; // to compute associated macro-cluster coordinates |
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123 | uint32_t node_base_x; // associated macro_cluster X coordinate |
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124 | uint32_t node_base_y; // associated macro_cluster y coordinate |
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125 | uint32_t half; // associated macro-cluster half size |
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126 | uint32_t cores; // number of cores in macro cluster |
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127 | uint32_t clusters; // number of clusters in macro cluster |
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128 | |
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129 | // get node cluster coordinates |
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130 | node_x = HAL_X_FROM_CXY( node_cxy ); |
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131 | node_y = HAL_Y_FROM_CXY( node_cxy ); |
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132 | |
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133 | // get macro-cluster mask and half-size |
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134 | mask = (1 << level) - 1; |
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135 | half = (level > 0) ? (1 << (level - 1)) : 0; |
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136 | |
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137 | // get macro-cluster coordinates |
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138 | node_base_x = node_x & ~mask; |
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139 | node_base_y = node_y & ~mask; |
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140 | |
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141 | // get pointer on local cluster manager |
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142 | cluster_t * cluster = LOCAL_CLUSTER; |
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143 | |
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144 | // build local and extended pointer on node to be initialized |
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145 | dqdt_node_t * node_ptr = &cluster->dqdt_tbl[level]; |
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146 | xptr_t node_xp = XPTR( node_cxy , node_ptr ); |
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147 | |
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148 | #if DEBUG_DQDT_INIT |
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149 | printk("\n[DBG] %s : cxy(%d,%d) / level %d / mask %x / half %d / ptr %x\n", |
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150 | __FUNCTION__, node_x, node_y, level, mask, half, node_ptr ); |
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151 | #endif |
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152 | |
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153 | // make remote node default initialisation |
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154 | hal_remote_memset( node_xp , 0 , sizeof( dqdt_node_t ) ); |
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155 | |
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156 | // initialize <parent> field |
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157 | hal_remote_s64( XPTR( node_cxy , &node_ptr->parent ) , parent_xp ); |
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158 | |
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159 | // initialize <level> field |
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160 | hal_remote_s32( XPTR( node_cxy , &node_ptr->level ) , level ); |
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161 | |
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162 | // recursive initialisation |
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163 | if( level == 0 ) // terminal case : cluster |
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164 | { |
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165 | // initialize <clusters> field in node |
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166 | hal_remote_s32( XPTR( node_cxy , &node_ptr->clusters ) , 1 ); |
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167 | |
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168 | // initialize <cores> field in node |
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169 | cores = hal_remote_l32( XPTR ( node_cxy , &cluster->cores_nr ) ); |
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170 | hal_remote_s32( XPTR( node_cxy , &node_ptr->cores ) , cores ); |
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171 | } |
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172 | else // non terminal : macro-cluster |
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173 | { |
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174 | bool_t found; |
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175 | uint32_t x; |
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176 | uint32_t y; |
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177 | cxy_t child_cxy; |
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178 | xptr_t child_xp; |
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179 | dqdt_node_t * child_ptr = &cluster->dqdt_tbl[level-1]; |
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180 | |
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181 | // search an active cluster in child[0][0] macro-cluster |
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182 | found = false; |
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183 | for( x = node_base_x ; |
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184 | (x < (node_base_x + half)) && (found == false) ; x++ ) |
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185 | { |
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186 | for( y = node_base_y ; |
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187 | (y < (node_base_y + half)) && (found == false) ; y++ ) |
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188 | { |
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189 | child_cxy = HAL_CXY_FROM_XY( x , y ); |
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190 | |
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191 | if( cluster_is_active( child_cxy ) ) |
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192 | { |
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193 | // initialize recursively selected child[0][0] node |
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194 | dqdt_recursive_build( child_cxy , level-1 , node_xp ); |
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195 | |
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196 | // build extended pointer on child[0][0] node |
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197 | child_xp = XPTR( child_cxy , child_ptr ); |
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198 | |
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199 | // update <cores> field in node |
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200 | cores = hal_remote_l32( XPTR ( child_cxy , &child_ptr->cores ) ); |
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201 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->cores ) , cores ); |
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202 | |
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203 | // update <clusters> field in node |
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204 | clusters = hal_remote_l32( XPTR ( child_cxy , &child_ptr->clusters ) ); |
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205 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->clusters ) , clusters ); |
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206 | |
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207 | // update <child[0][0]> field in node |
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208 | hal_remote_s64( XPTR( node_cxy , &node_ptr->children[0][0] ), child_xp ); |
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209 | |
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210 | // udate <arity> field in node |
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211 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->arity ) , 1 ); |
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212 | |
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213 | // exit loops |
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214 | found = true; |
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215 | } |
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216 | } |
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217 | } |
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218 | |
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219 | // search an active cluster in child[0][1] macro-cluster |
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220 | found = false; |
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221 | for( x = node_base_x ; |
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222 | (x < (node_base_x + half)) && (found == false) ; x++ ) |
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223 | { |
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224 | for( y = (node_base_y + half) ; |
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225 | (y < (node_base_y + (half<<1))) && (found == false) ; y++ ) |
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226 | { |
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227 | child_cxy = HAL_CXY_FROM_XY( x , y ); |
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228 | |
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229 | if( cluster_is_active( child_cxy ) ) |
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230 | { |
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231 | // initialize recursively selected child[0][1] node |
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232 | dqdt_recursive_build( child_cxy , level-1 , node_xp ); |
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233 | |
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234 | // build extended pointer on child[0][1] node |
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235 | child_xp = XPTR( child_cxy , child_ptr ); |
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236 | |
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237 | // update <cores> field in node |
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238 | cores = hal_remote_l32( XPTR ( child_cxy , &child_ptr->cores ) ); |
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239 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->cores ) , cores ); |
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240 | |
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241 | // update <clusters> field in node |
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242 | clusters = hal_remote_l32( XPTR ( child_cxy , &child_ptr->clusters ) ); |
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243 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->clusters ) , clusters ); |
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244 | |
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245 | // update <child[0][1]> field in node |
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246 | hal_remote_s64( XPTR( node_cxy , &node_ptr->children[0][1] ), child_xp ); |
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247 | |
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248 | // udate <arity> field in node |
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249 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->arity ) , 1 ); |
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250 | |
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251 | // exit loops |
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252 | found = true; |
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253 | } |
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254 | } |
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255 | } |
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256 | |
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257 | // search an active cluster in child[1][0] macro-cluster |
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258 | found = false; |
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259 | for( x = (node_base_x +half) ; |
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260 | (x < (node_base_x + (half<<1))) && (found == false) ; x++ ) |
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261 | { |
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262 | for( y = node_base_y ; |
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263 | (y < (node_base_y + half)) && (found == false) ; y++ ) |
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264 | { |
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265 | child_cxy = HAL_CXY_FROM_XY( x , y ); |
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266 | |
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267 | if( cluster_is_active( child_cxy ) ) |
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268 | { |
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269 | // initialize recursively selected child[1][0] node |
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270 | dqdt_recursive_build( child_cxy , level-1 , node_xp ); |
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271 | |
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272 | // build extended pointer on child[1][0] node |
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273 | child_xp = XPTR( child_cxy , child_ptr ); |
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274 | |
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275 | // update <cores> field in node |
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276 | cores = hal_remote_l32( XPTR ( child_cxy , &child_ptr->cores ) ); |
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277 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->cores ) , cores ); |
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278 | |
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279 | // update <clusters> field in node |
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280 | clusters = hal_remote_l32( XPTR ( child_cxy , &child_ptr->clusters ) ); |
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281 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->clusters ) , clusters ); |
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282 | |
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283 | // update <child[1][0]> field in node |
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284 | hal_remote_s64( XPTR( node_cxy , &node_ptr->children[1][0] ), child_xp ); |
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285 | |
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286 | // udate <arity> field in node |
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287 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->arity ) , 1 ); |
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288 | |
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289 | // exit loops |
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290 | found = true; |
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291 | } |
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292 | } |
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293 | } |
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294 | |
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295 | // search an active cluster in child[1][1] macro-cluster |
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296 | found = false; |
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297 | for( x = (node_base_x + half) ; |
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298 | (x < (node_base_x + (half<<1))) && (found == false) ; x++ ) |
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299 | { |
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300 | for( y = (node_base_y + half) ; |
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301 | (y < (node_base_y + (half<<1))) && (found == false) ; y++ ) |
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302 | { |
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303 | child_cxy = HAL_CXY_FROM_XY( x , y ); |
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304 | |
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305 | if( cluster_is_active( child_cxy ) ) |
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306 | { |
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307 | // initialize recursively selected child[1][1] node |
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308 | dqdt_recursive_build( child_cxy , level-1 , node_xp ); |
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309 | |
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310 | // build extended pointer on child[1][1] node |
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311 | child_xp = XPTR( child_cxy , child_ptr ); |
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312 | |
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313 | // update <cores> field in node |
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314 | cores = hal_remote_l32( XPTR ( child_cxy , &child_ptr->cores ) ); |
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315 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->cores ) , cores ); |
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316 | |
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317 | // update <clusters> field in node |
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318 | clusters = hal_remote_l32( XPTR ( child_cxy , &child_ptr->clusters ) ); |
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319 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->clusters ) , clusters ); |
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320 | |
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321 | // update <child[1][1]> field in node |
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322 | hal_remote_s64( XPTR( node_cxy , &node_ptr->children[1][1] ), child_xp ); |
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323 | |
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324 | // udate <arity> field in node |
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325 | hal_remote_atomic_add( XPTR( node_cxy , &node_ptr->arity ) , 1 ); |
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326 | |
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327 | // exit loops |
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328 | found = true; |
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329 | } |
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330 | } |
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331 | } |
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332 | } |
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333 | } // end dqdt_recursive_build() |
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334 | |
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335 | ////////////////////// |
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336 | void dqdt_init( void ) |
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337 | { |
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338 | // get x_size & y_size from cluster manager |
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339 | cluster_t * cluster = &cluster_manager; |
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340 | uint32_t x_size = cluster->x_size; |
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341 | uint32_t y_size = cluster->y_size; |
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342 | |
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343 | assert( ((x_size <= 16) && (y_size <= 16)) , "illegal mesh size\n"); |
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344 | |
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345 | // compute level_max |
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346 | uint32_t x_size_ext = POW2_ROUNDUP( x_size ); |
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347 | uint32_t y_size_ext = POW2_ROUNDUP( y_size ); |
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348 | uint32_t size_ext = MAX( x_size_ext , y_size_ext ); |
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349 | uint32_t level_max = bits_log2( size_ext ); |
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350 | |
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351 | // each CP0 register the DQDT root in local cluster manager |
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352 | cluster->dqdt_root_xp = XPTR( 0 , &cluster->dqdt_tbl[level_max] ); |
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353 | |
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354 | #if DEBUG_DQDT_INIT |
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355 | if( local_cxy == 0 ) |
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356 | printk("\n[DBG] %s : x_size = %d / y_size = %d / level_max = %d\n", |
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357 | __FUNCTION__, x_size, y_size, level_max ); |
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358 | #endif |
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359 | |
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360 | // only CP0 in cluster 0 call the recursive function to build the quad-tree |
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361 | if (local_cxy == 0) dqdt_recursive_build( local_cxy , level_max , XPTR_NULL ); |
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362 | |
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363 | #if DEBUG_DQDT_INIT |
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364 | if( local_cxy == 0 ) dqdt_display(); |
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365 | #endif |
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366 | |
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367 | } // end dqdt_init() |
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368 | |
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369 | |
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370 | /////////////////////////////////////////////////////////////////////////// |
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371 | // This recursive function is called by both the dqdt_increment_pages() |
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372 | // and by the dqdt_decrement_pages() functions. |
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373 | // It traverses the quad tree from clusters to root. |
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374 | /////////////////////////////////////////////////////////////////////////// |
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375 | // @ node : extended pointer on current node |
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376 | // @ increment : number of pages variation |
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377 | /////////////////////////////////////////////////////////////////////////// |
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378 | static void dqdt_propagate_pages( xptr_t node, |
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379 | int32_t increment ) |
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380 | { |
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381 | // get current node cluster identifier and local pointer |
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382 | cxy_t cxy = GET_CXY( node ); |
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383 | dqdt_node_t * ptr = GET_PTR( node ); |
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384 | |
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385 | // update current node pages number |
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386 | hal_remote_atomic_add( XPTR( cxy , &ptr->pages ) , increment ); |
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387 | |
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388 | // get extended pointer on parent node |
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389 | xptr_t parent = (xptr_t)hal_remote_l64( XPTR( cxy , &ptr->parent ) ); |
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390 | |
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391 | // propagate if required |
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392 | if ( parent != XPTR_NULL ) dqdt_propagate_pages( parent, increment ); |
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393 | } |
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394 | |
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395 | /////////////////////////////////////////// |
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396 | void dqdt_increment_pages( uint32_t order ) |
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397 | { |
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398 | cluster_t * cluster = LOCAL_CLUSTER; |
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399 | dqdt_node_t * node = &cluster->dqdt_tbl[0]; |
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400 | |
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401 | // update DQDT node level 0 |
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402 | hal_atomic_add( &node->pages , (1 << order) ); |
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403 | |
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404 | // propagate to DQDT upper levels |
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405 | if( node->parent != XPTR_NULL ) dqdt_propagate_pages( node->parent , (1 << order) ); |
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406 | |
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407 | #if DEBUG_DQDT_UPDATE_PAGES |
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408 | uint32_t cycle = hal_get_cycles(); |
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409 | if( cycle > DEBUG_DQDT_UPDATE_PAGES ) |
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410 | printk("\n[DBG] %s : thread %x in process %x / %x pages in cluster %x / cycle %d\n", |
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411 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, node->pages, local_cxy, cycle ); |
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412 | #endif |
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413 | |
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414 | } |
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415 | |
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416 | /////////////////////////////////////////// |
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417 | void dqdt_decrement_pages( uint32_t order ) |
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418 | { |
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419 | cluster_t * cluster = LOCAL_CLUSTER; |
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420 | dqdt_node_t * node = &cluster->dqdt_tbl[0]; |
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421 | |
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422 | // update DQDT node level 0 |
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423 | hal_atomic_add( &node->pages , -(1 << order) ); |
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424 | |
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425 | // propagate to DQDT upper levels |
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426 | if( node->parent != XPTR_NULL ) dqdt_propagate_pages( node->parent , -(1 << order) ); |
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427 | |
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428 | #if DEBUG_DQDT_UPDATE_PAGES |
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429 | uint32_t cycle = hal_get_cycles(); |
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430 | if( cycle > DEBUG_DQDT_UPDATE_PAGES ) |
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431 | printk("\n[DBG] %s : thread %x in process %x / %x pages in cluster %x / cycle %d\n", |
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432 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, node->pages, local_cxy, cycle ); |
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433 | #endif |
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434 | |
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435 | } |
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436 | |
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437 | |
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438 | |
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439 | /////////////////////////////////////////////////////////////////////////// |
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440 | // This recursive function is called by both the dqdt_increment_threads() |
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441 | // and by the dqdt_decrement_threads functions. |
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442 | // It traverses the quad tree from clusters to root. |
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443 | /////////////////////////////////////////////////////////////////////////// |
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444 | // @ node : extended pointer on current node |
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445 | // @ increment : number of pages variation |
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446 | /////////////////////////////////////////////////////////////////////////// |
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447 | static void dqdt_propagate_threads( xptr_t node, |
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448 | int32_t increment ) |
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449 | { |
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450 | // get current node cluster identifier and local pointer |
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451 | cxy_t cxy = GET_CXY( node ); |
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452 | dqdt_node_t * ptr = GET_PTR( node ); |
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453 | |
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454 | // update current node threads number |
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455 | hal_remote_atomic_add( XPTR( cxy , &ptr->threads ) , increment ); |
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456 | |
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457 | // get extended pointer on parent node |
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458 | xptr_t parent = (xptr_t)hal_remote_l64( XPTR( cxy , &ptr->parent ) ); |
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459 | |
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460 | // propagate if required |
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461 | if ( parent != XPTR_NULL ) dqdt_propagate_threads( parent, increment ); |
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462 | } |
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463 | |
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464 | /////////////////////////////////// |
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465 | void dqdt_increment_threads( void ) |
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466 | { |
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467 | cluster_t * cluster = LOCAL_CLUSTER; |
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468 | dqdt_node_t * node = &cluster->dqdt_tbl[0]; |
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469 | |
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470 | // update DQDT node level 0 |
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471 | hal_atomic_add( &node->threads , 1 ); |
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472 | |
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473 | // propagate to DQDT upper levels |
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474 | if( node->parent != XPTR_NULL ) dqdt_propagate_threads( node->parent , 1 ); |
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475 | |
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476 | #if DEBUG_DQDT_UPDATE_THREADS |
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477 | uint32_t cycle = hal_get_cycles(); |
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478 | if( cycle > DEBUG_DQDT_UPDATE_THREADS ) |
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479 | printk("\n[DBG] %s : thread %x in process %x / %d threads in cluster %x / cycle %d\n", |
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480 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, node->threads, local_cxy, cycle ); |
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481 | #endif |
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482 | |
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483 | } |
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484 | |
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485 | /////////////////////////////////// |
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486 | void dqdt_decrement_threads( void ) |
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487 | { |
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488 | cluster_t * cluster = LOCAL_CLUSTER; |
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489 | dqdt_node_t * node = &cluster->dqdt_tbl[0]; |
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490 | |
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491 | // update DQDT node level 0 |
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492 | hal_atomic_add( &node->threads , -1 ); |
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493 | |
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494 | // propagate to DQDT upper levels |
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495 | if( node->parent != XPTR_NULL ) dqdt_propagate_threads( node->parent , -1 ); |
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496 | |
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497 | #if DEBUG_DQDT_UPDATE_THREADS |
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498 | uint32_t cycle = hal_get_cycles(); |
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499 | if( cycle > DEBUG_DQDT_UPDATE_THREADS ) |
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500 | printk("\n[DBG] %s : thread %x in process %x / %d threads in cluster %x / cycle %d\n", |
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501 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, node->threads, local_cxy, cycle ); |
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502 | #endif |
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503 | |
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504 | } |
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505 | |
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506 | |
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507 | ///////////////////////////////////////////////////////////////////////////////////// |
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508 | // This recursive function is called by both the dqdt_get_cluster_for_process() |
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509 | // and by the dqdt_get_cluster_for_memory() functions to select the cluster with the |
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510 | // smallest number of threads per core, or the smallest number of pages per cluster. |
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511 | // It traverses the quad tree from root to clusters. |
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512 | ///////////////////////////////////////////////////////////////////////////////////// |
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513 | static cxy_t dqdt_select_cluster( xptr_t node, |
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514 | bool_t for_memory ) |
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515 | { |
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516 | dqdt_node_t node_copy; // local copy of the current DQDT node |
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517 | xptr_t child_xp; // extended pointer on a DQDT child node |
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518 | uint32_t x; // child node X coordinate |
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519 | uint32_t y; // child node Y coordinate |
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520 | uint32_t select_x; // selected child X coordinate |
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521 | uint32_t select_y; // selected child Y coordinate |
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522 | uint32_t load; // load of the child (threads or pages) |
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523 | uint32_t load_min; // current value of the minimal load |
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524 | |
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525 | // get DQDT node local copy |
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526 | hal_remote_memcpy( XPTR( local_cxy , &node_copy ), node , sizeof(dqdt_node_t) ); |
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527 | |
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528 | // return cluster identifier for a terminal mode |
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529 | if( node_copy.level == 0 ) return GET_CXY(node); |
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530 | |
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531 | // analyse load for all children in non terminal node |
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532 | load_min = 0xFFFFFFFF; |
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533 | select_x = 0; |
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534 | select_y = 0; |
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535 | for( x = 0 ; x < 2 ; x++ ) |
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536 | { |
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537 | for( y = 0 ; y < 2 ; y++ ) |
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538 | { |
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539 | child_xp = node_copy.children[x][y]; |
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540 | if( child_xp != XPTR_NULL ) |
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541 | { |
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542 | cxy_t cxy = GET_CXY( child_xp ); |
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543 | dqdt_node_t * ptr = GET_PTR( child_xp ); |
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544 | |
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545 | // compute average load for each child |
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546 | if( for_memory ) |
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547 | { |
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548 | load = hal_remote_l32( XPTR( cxy , &ptr->pages ) ) / |
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549 | hal_remote_l32( XPTR( cxy , &ptr->clusters ) ); |
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550 | } |
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551 | else |
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552 | { |
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553 | load = hal_remote_l32( XPTR( cxy , &ptr->threads ) ) / |
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554 | hal_remote_l32( XPTR( cxy , &ptr->cores ) ); |
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555 | } |
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556 | |
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557 | // select children with smallest load |
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558 | if( load <= load_min ) |
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559 | { |
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560 | load_min = load; |
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561 | select_x = x; |
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562 | select_y = y; |
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563 | } |
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564 | } |
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565 | } |
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566 | } |
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567 | |
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568 | // select the child with the lowest load |
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569 | return dqdt_select_cluster( node_copy.children[select_x][select_y], for_memory ); |
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570 | |
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571 | } // end dqdt_select_cluster() |
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572 | |
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573 | |
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574 | ////////////////////////////////////////// |
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575 | cxy_t dqdt_get_cluster_for_process( void ) |
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576 | { |
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577 | // call recursive function |
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578 | cxy_t cxy = dqdt_select_cluster( LOCAL_CLUSTER->dqdt_root_xp , false ); |
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579 | |
---|
580 | #if DEBUG_DQDT_SELECT_FOR_PROCESS |
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581 | uint32_t cycle = hal_get_cycles(); |
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582 | if( cycle > DEBUG_DQDT_SELECT_FOR_PROCESS ) |
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583 | printk("\n[DBG] %s : thread %x in process %x select cluster %x / cycle %d\n", |
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584 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cxy, cycle ); |
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585 | #endif |
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586 | |
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587 | return cxy; |
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588 | } |
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589 | |
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590 | ///////////////////////////////////////// |
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591 | cxy_t dqdt_get_cluster_for_memory( void ) |
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592 | { |
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593 | // call recursive function |
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594 | cxy_t cxy = dqdt_select_cluster( LOCAL_CLUSTER->dqdt_root_xp , true ); |
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595 | |
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596 | #if DEBUG_DQDT_SELECT_FOR_MEMORY |
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597 | uint32_t cycle = hal_get_cycles(); |
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598 | if( cycle > DEBUG_DQDT_SELECT_FOR_MEMORY ) |
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599 | printk("\n[DBG] %s : thread %x in process %x select cluster %x / cycle %d\n", |
---|
600 | __FUNCTION__, CURRENT_THREAD->trdid, CURRENT_THREAD->process->pid, cxy, cycle ); |
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601 | #endif |
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602 | |
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603 | return cxy; |
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604 | } |
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605 | |
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