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1 /*
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2 * Copyright 2009 OpenSourceCodeStewardshipFoundation.org
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3 * Licensed under GNU General Public License version 2
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4 *
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5 * Author: seanhalle@yahoo.com
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6 *
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7 * Created on November 14, 2009, 9:07 PM
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8 */
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9
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10 #include <malloc.h>
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11 #include <inttypes.h>
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12 #include <stdlib.h>
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13 #include <stdio.h>
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14
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15 #include "ProcrContext.h"
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16 #include "Histogram/Histogram.h"
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17
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18 /*Helper function
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19 *Insert a newly generated free chunk into the first spot on the free list.
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20 * The chunk is cast as a MallocProlog, so the various pointers in it are
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21 * accessed with C's help -- and the size of the prolog is easily added to
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22 * the pointer when a chunk is returned to the app -- so C handles changes
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23 * in pointer sizes among machines.
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24 *
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25 *The list head is a normal MallocProlog struct -- identified by its
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26 * prevChunkInFreeList being NULL -- the only one.
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27 *
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28 *The end of the list is identified by next chunk being NULL, as usual.
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29 */
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30 void inline
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31 add_chunk_to_free_list( MallocProlog *chunk, MallocProlog *listHead )
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32 {
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33 chunk->nextChunkInFreeList = listHead->nextChunkInFreeList;
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34 if( chunk->nextChunkInFreeList != NULL ) //if not last in free list
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35 chunk->nextChunkInFreeList->prevChunkInFreeList = chunk;
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36 chunk->prevChunkInFreeList = listHead;
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37 listHead->nextChunkInFreeList = chunk;
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38 }
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39
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40 /*
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41 * This function is called by code which is part of the master loop.
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42 * This reads the animating coreID from the MasterEnv and calls the normal malloc
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43 * in VMS__malloc_on_core
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44 */
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45 void *
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46 VMS__malloc( size_t sizeRequested)
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47 {
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48 return VMS__malloc_on_core(sizeRequested, _VMSMasterEnv->currentMasterProcrID);
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49 }
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50
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51 /*
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52 * This is called by the plugin. This call to VMS_malloc_on_core is run on the
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53 * slave VPs stack so there is no switch to the VMS runtime.
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54 */
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55 void *
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56 VMS__malloc_in_lib(size_t sizeRequested, VirtProcr *VProcr)
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57 {
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58 return VMS__malloc_on_core(sizeRequested, VProcr->coreAnimatedBy);
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59 }
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60
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61 /*
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62 *Search down list, checking size by the nextHigherInMem pointer, to find
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63 * first chunk bigger than size needed.
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64 *Shave off the extra and make it into a new free-list element, hook it in
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65 * then return the address of the found element plus size of prolog.
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66 */
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67 void *
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68 VMS__malloc_on_core( size_t sizeRequested, int procrID)
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69 { MallocProlog *foundElem = NULL, *currElem, *newElem;
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70 MallocPrologAllocated *returnElem;
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71 ssize_t amountExtra, sizeConsumed,sizeOfFound;
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72 uint32 foundElemIsTopOfHeap;
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73
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74 //============================= MEASUREMENT STUFF ========================
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75 #ifdef MEAS__TIME_MALLOC
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76 int32 startStamp, endStamp;
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77 saveLowTimeStampCountInto( startStamp );
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78 #endif
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79 //========================================================================
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80
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81 //step up the size to be aligned at 16-byte boundary, prob better ways
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82 sizeRequested = (sizeRequested + 16) & ~15;
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83 currElem = (_VMSMasterEnv->freeListHead[_VMSMasterEnv->currentMasterProcrID])
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84 ->nextChunkInFreeList;
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85
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86 while( currElem != NULL )
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87 { //check if size of currElem is big enough
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88 sizeOfFound=(size_t)((uintptr_t)currElem->nextHigherInMem -(uintptr_t)currElem);
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89 amountExtra = sizeOfFound - sizeRequested - sizeof(MallocProlog);
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90 if( amountExtra > 0 )
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91 { //found it, get out of loop
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92 foundElem = currElem;
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93 currElem = NULL;
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94 }
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95 else
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96 currElem = currElem->nextChunkInFreeList;
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97 }
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98
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99 if( foundElem == NULL )
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100 { ERROR("\nmalloc failed\n")
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101 return (void *)NULL; //indicates malloc failed
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102 }
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103 //Using a kludge to identify the element that is the top chunk in the
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104 // heap -- saving top-of-heap addr in head's nextHigherInMem -- and
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105 // save addr of start of heap in head's nextLowerInMem
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106 //Will handle top of Heap specially
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107 foundElemIsTopOfHeap = foundElem->nextHigherInMem ==
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108 _VMSMasterEnv->freeListHead->nextHigherInMem;
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109
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110 //before shave off and try to insert new elem, remove found elem
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111 //note, foundElem will never be the head, so always has valid prevChunk
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112 foundElem->prevChunkInFreeList->nextChunkInFreeList =
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113 foundElem->nextChunkInFreeList;
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114 if( foundElem->nextChunkInFreeList != NULL )
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115 { foundElem->nextChunkInFreeList->prevChunkInFreeList =
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116 foundElem->prevChunkInFreeList;
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117 }
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118 returnElem = (MallocPrologAllocated*)foundElem;
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119 returnElem->prevChunkInFreeList = NULL;//indicates elem currently allocated
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120 returnElem->procrID = procrID;
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121
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122 //if enough, turn extra into new elem & insert it
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123 if( amountExtra > 64 )
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124 { //make new elem by adding to addr of curr elem then casting
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125 sizeConsumed = sizeof(MallocProlog) + sizeRequested;
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126 newElem = (MallocProlog *)( (uintptr_t)returnElem + sizeConsumed );
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127 newElem->nextLowerInMem = returnElem; //This is evil (but why?)
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128 newElem->nextHigherInMem = returnElem->nextHigherInMem; //This is evil (but why?)
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129 returnElem->nextHigherInMem = newElem;
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130 if( ! foundElemIsTopOfHeap )
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131 { //there is no next higher for top of heap, so can't write to it
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132 newElem->nextHigherInMem->nextLowerInMem = newElem;
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133 }
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134 add_chunk_to_free_list( newElem, _VMSMasterEnv->freeListHead );
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135 }
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136 else
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137 {
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138 sizeConsumed = sizeOfFound;
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139 }
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140 _VMSMasterEnv->amtOfOutstandingMem += sizeConsumed;
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141
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142 //============================= MEASUREMENT STUFF ========================
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143 #ifdef MEAS__TIME_MALLOC
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144 saveLowTimeStampCountInto( endStamp );
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145 addIntervalToHist( startStamp, endStamp, _VMSMasterEnv->mallocTimeHist );
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146 #endif
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147 //========================================================================
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148
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149 //skip over the prolog by adding its size to the pointer return
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150 return (void*)((uintptr_t)returnElem + sizeof(MallocProlog));
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151 }
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152
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153 /*
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154 * This free is called for a master loop. It decides whether the allocation of
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155 * chunk was done on the same core. If it was it calls VMS__free_on_core
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156 * otherwise it sends a message to the responsible core.
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157 */
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158 void
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159 VMS__free(void *ptrToFree)
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160 {
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161 MallocPrologAllocated chunk = (MallocPrologAllocated*)ptrToFree - 1;
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162 if(chunk->procrID == _VMSMasterEnv->currentMasterProcrID)
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163 {
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164 VMS__free_on_core(ptrToFree, _VMSMasterEnv->currentMasterProcrID);
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165 }
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166 else
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167 {
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168 //Request from other Core
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169 }
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170 }
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171
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172 /*
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173 * This free is called for the plugins. It decides whether the allocation of
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174 * chunk was done on the same core. If it was it calls VMS__free_on_core
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175 * otherwise it sends a message to the responsible core.
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176 */
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177 void
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178 VMS__free_in_lib(void *ptrToFree, VirtProcr *VProc)
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179 {
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180 MallocPrologAllocated chunk = (MallocPrologAllocated*)ptrToFree - 1;
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181 if(chunk->procrID == VProc->coreAnimatedBy)
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182 {
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183 VMS__free_on_core(ptrToFree, VProc->coreAnimatedBy);
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184 }
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185 else
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186 {
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187 //Request from other Core
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188 }
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189 }
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190
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191 /*This is sequential code -- only to be called from the Master
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192 * When free, subtract the size of prolog from pointer, then cast it to a
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193 * MallocProlog. Then check the nextLower and nextHigher chunks to see if
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194 * one or both are also free, and coalesce if so, and if neither free, then
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195 * add this one to free-list.
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196 */
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197 void
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198 VMS__free_on_core( void *ptrToFree, int procrID)
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199 { MallocProlog *elemToFree, *nextLowerElem, *nextHigherElem;
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200 size_t sizeOfElem;
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201 uint32 lowerExistsAndIsFree, higherExistsAndIsFree;
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202
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203 //============================= MEASUREMENT STUFF ========================
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204 #ifdef MEAS__TIME_MALLOC
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205 int32 startStamp, endStamp;
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206 saveLowTimeStampCountInto( startStamp );
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207 #endif
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208 //========================================================================
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209
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210 if( ptrToFree < (void*)_VMSMasterEnv->freeListHead->nextLowerInMem ||
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211 ptrToFree > (void*)_VMSMasterEnv->freeListHead->nextHigherInMem )
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212 { //outside the range of data owned by VMS's malloc, so do nothing
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213 return;
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214 }
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215 //subtract size of prolog to get pointer to prolog, then cast
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216 elemToFree = (MallocProlog *)((uintptr_t)ptrToFree - sizeof(MallocProlog));
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217 sizeOfElem =(size_t)((uintptr_t)elemToFree->nextHigherInMem-(uintptr_t)elemToFree);
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218
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219 if( elemToFree->prevChunkInFreeList != NULL )
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220 { printf( "error: freeing same element twice!" ); exit(1);
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221 }
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222
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223 _VMSMasterEnv->amtOfOutstandingMem -= sizeOfElem;
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224
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225 nextLowerElem = elemToFree->nextLowerInMem;
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226 nextHigherElem = elemToFree->nextHigherInMem;
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227
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228 if( nextHigherElem == NULL )
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229 higherExistsAndIsFree = FALSE;
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230 else //okay exists, now check if in the free-list by checking back ptr
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231 higherExistsAndIsFree = (nextHigherElem->prevChunkInFreeList != NULL);
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232
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233 if( nextLowerElem == NULL )
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234 lowerExistsAndIsFree = FALSE;
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235 else //okay, it exists, now check if it's free
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236 lowerExistsAndIsFree = (nextLowerElem->prevChunkInFreeList != NULL);
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237
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238
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239 //now, know what exists and what's free
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240 if( lowerExistsAndIsFree )
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241 { if( higherExistsAndIsFree )
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242 { //both exist and are free, so coalesce all three
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243 //First, remove higher from free-list
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244 nextHigherElem->prevChunkInFreeList->nextChunkInFreeList =
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245 nextHigherElem->nextChunkInFreeList;
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246 if( nextHigherElem->nextChunkInFreeList != NULL ) //end-of-list?
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247 nextHigherElem->nextChunkInFreeList->prevChunkInFreeList =
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248 nextHigherElem->prevChunkInFreeList;
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249 //Now, fix-up sequence-in-mem list -- by side-effect, this also
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250 // changes size of the lower elem, which is still in free-list
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251 nextLowerElem->nextHigherInMem = nextHigherElem->nextHigherInMem;
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252 if( nextHigherElem->nextHigherInMem !=
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253 _VMSMasterEnv->freeListHead->nextHigherInMem )
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254 nextHigherElem->nextHigherInMem->nextLowerInMem = nextLowerElem;
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255 //notice didn't do anything to elemToFree -- it simply is no
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256 // longer reachable from any of the lists. Wonder if could be a
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257 // security leak because left valid addresses in it,
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258 // but don't care for now.
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259 }
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260 else
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261 { //lower is the only of the two that exists and is free,
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262 //In this case, no adjustment to free-list, just change mem-list.
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263 // By side-effect, changes size of the lower elem
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264 nextLowerElem->nextHigherInMem = elemToFree->nextHigherInMem;
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265 if( elemToFree->nextHigherInMem !=
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266 _VMSMasterEnv->freeListHead->nextHigherInMem )
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267 elemToFree->nextHigherInMem->nextLowerInMem = nextLowerElem;
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268 }
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269 }
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270 else
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271 { //lower either doesn't exist or isn't free, so check higher
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272 if( higherExistsAndIsFree )
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273 { //higher exists and is the only of the two free
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274 //First, in free-list, replace higher elem with the one to free
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275 elemToFree->nextChunkInFreeList=nextHigherElem->nextChunkInFreeList;
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276 elemToFree->prevChunkInFreeList=nextHigherElem->prevChunkInFreeList;
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277 elemToFree->prevChunkInFreeList->nextChunkInFreeList = elemToFree;
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278 if( elemToFree->nextChunkInFreeList != NULL ) // end-of-list?
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279 elemToFree->nextChunkInFreeList->prevChunkInFreeList =elemToFree;
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280 //Now chg mem-list. By side-effect, changes size of elemToFree
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281 elemToFree->nextHigherInMem = nextHigherElem->nextHigherInMem;
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282 if( elemToFree->nextHigherInMem !=
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283 _VMSMasterEnv->freeListHead->nextHigherInMem )
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284 elemToFree->nextHigherInMem->nextLowerInMem = elemToFree;
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285 }
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286 else
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287 { //neither lower nor higher is availabe to coalesce so add to list
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288 // this makes prev chunk ptr non-null, which indicates it's free
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289 elemToFree->nextChunkInFreeList =
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290 _VMSMasterEnv->freeListHead->nextChunkInFreeList;
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291 _VMSMasterEnv->freeListHead->nextChunkInFreeList = elemToFree;
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292 if( elemToFree->nextChunkInFreeList != NULL ) // end-of-list?
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293 elemToFree->nextChunkInFreeList->prevChunkInFreeList =elemToFree;
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294 elemToFree->prevChunkInFreeList = _VMSMasterEnv->freeListHead;
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295 }
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Me@50
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296 }
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Me@65
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297 //============================= MEASUREMENT STUFF ========================
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Me@65
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298 #ifdef MEAS__TIME_MALLOC
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Me@65
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299 saveLowTimeStampCountInto( endStamp );
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Me@65
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300 addIntervalToHist( startStamp, endStamp, _VMSMasterEnv->freeTimeHist );
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Me@65
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301 #endif
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Me@65
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302 //========================================================================
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Me@50
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303
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Me@50
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304 }
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Me@50
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305
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Me@50
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306
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Me@53
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307 /*Allocates memory from the external system -- higher overhead
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Me@53
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308 *
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Me@53
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309 *Because of Linux's malloc throwing bizarre random faults when malloc is
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Me@53
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310 * used inside a VMS virtual processor, have to pass this as a request and
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Me@53
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311 * have the core loop do it when it gets around to it -- will look for these
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Me@53
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312 * chores leftover from the previous animation of masterVP the next time it
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Me@53
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313 * goes to animate the masterVP -- so it takes two separate masterVP
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Me@53
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314 * animations, separated by work, to complete an external malloc or
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Me@53
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315 * external free request.
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Me@53
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316 *
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Me@53
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317 *Thinking core loop accepts signals -- just looks if signal-location is
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Me@53
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318 * empty or not --
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Me@53
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319 */
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Me@53
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320 void *
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msach@76
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321 VMS__malloc_in_ext( size_t sizeRequested )
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Me@53
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322 {
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Me@53
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323 /*
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Me@53
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324 //This is running in the master, so no chance for multiple cores to be
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Me@53
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325 // competing for the core's flag.
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Me@53
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326 if( *(_VMSMasterEnv->coreLoopSignalAddr[ 0 ]) != 0 )
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Me@53
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327 { //something has already signalled to core loop, so save the signal
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Me@53
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328 // and look, next time master animated, to see if can send it.
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Me@53
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329 //Note, the addr to put a signal is in the coreloop's frame, so just
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Me@53
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330 // checks it each time through -- make it volatile to avoid GCC
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Me@53
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331 // optimizations -- it's a coreloop local var that only changes
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Me@53
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332 // after jumping away. The signal includes the addr to send the
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Me@53
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333 //return to -- even if just empty return completion-signal
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Me@53
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334 //
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Me@53
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335 //save the signal in some queue that the master looks at each time
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Me@53
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336 // it starts up -- one loc says if empty for fast common case --
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Me@53
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337 //something like that -- want to hide this inside this call -- but
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Me@53
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338 // think this has to come as a request -- req handler gives procr
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Me@53
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339 // back to master loop, which gives it back to req handler at point
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Me@53
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340 // it sees that core loop has sent return signal. Something like
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Me@53
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341 // that.
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Me@53
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342 saveTheSignal
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Me@53
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343
|
|
Me@53
|
344 }
|
|
Me@53
|
345 coreSigData->type = malloc;
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Me@53
|
346 coreSigData->sizeToMalloc = sizeRequested;
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Me@53
|
347 coreSigData->locToSignalCompletion = &figureOut;
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|
Me@53
|
348 _VMSMasterEnv->coreLoopSignals[ 0 ] = coreSigData;
|
|
Me@53
|
349 */
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|
Me@53
|
350 //just risk system-stack faults until get this figured out
|
|
Me@53
|
351 return malloc( sizeRequested );
|
|
Me@53
|
352 }
|
|
Me@53
|
353
|
|
Me@53
|
354
|
|
Me@53
|
355 /*Frees memory that was allocated in the external system -- higher overhead
|
|
Me@53
|
356 *
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|
Me@53
|
357 *As noted in external malloc comment, this is clunky 'cause the free has
|
|
Me@53
|
358 * to be called in the core loop.
|
|
Me@53
|
359 */
|
|
Me@53
|
360 void
|
|
Me@53
|
361 VMS__free_in_ext( void *ptrToFree )
|
|
Me@53
|
362 {
|
|
Me@53
|
363 //just risk system-stack faults until get this figured out
|
|
Me@53
|
364 free( ptrToFree );
|
|
Me@53
|
365
|
|
Me@53
|
366 //TODO: fix this -- so
|
|
Me@53
|
367 }
|
|
Me@53
|
368
|
|
Me@53
|
369
|
|
Me@50
|
370 /*Designed to be called from the main thread outside of VMS, during init
|
|
Me@50
|
371 */
|
|
Me@50
|
372 MallocProlog *
|
|
Me@53
|
373 VMS_ext__create_free_list()
|
|
Me@50
|
374 { MallocProlog *freeListHead, *firstChunk;
|
|
msach@132
|
375
|
|
Me@50
|
376 //Note, this is running in the main thread -- all increases in malloc
|
|
Me@50
|
377 // mem and all frees of it must be done in this thread, with the
|
|
Me@50
|
378 // thread's original stack available
|
|
Me@50
|
379 freeListHead = malloc( sizeof(MallocProlog) );
|
|
Me@50
|
380 firstChunk = malloc( MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE );
|
|
Me@50
|
381 if( firstChunk == NULL ) {printf("malloc error\n"); exit(1);}
|
|
msach@79
|
382
|
|
msach@82
|
383 //Touch memory to avoid page faults
|
|
msach@81
|
384 void *ptr,*endPtr;
|
|
msach@81
|
385 endPtr = (void*)firstChunk+MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE;
|
|
msach@81
|
386 for(ptr = firstChunk; ptr < endPtr; ptr+=PAGE_SIZE)
|
|
msach@81
|
387 {
|
|
msach@81
|
388 *(char*)ptr = 0;
|
|
msach@81
|
389 }
|
|
Me@50
|
390
|
|
Me@50
|
391 freeListHead->prevChunkInFreeList = NULL;
|
|
Me@50
|
392 //Use this addr to free the heap when cleanup
|
|
Me@50
|
393 freeListHead->nextLowerInMem = firstChunk;
|
|
Me@50
|
394 //to identify top-of-heap elem, compare this addr to elem's next higher
|
|
msach@76
|
395 freeListHead->nextHigherInMem = (void*)( (uintptr_t)firstChunk +
|
|
Me@53
|
396 MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE);
|
|
Me@50
|
397 freeListHead->nextChunkInFreeList = firstChunk;
|
|
Me@50
|
398
|
|
Me@50
|
399 firstChunk->nextChunkInFreeList = NULL;
|
|
Me@50
|
400 firstChunk->prevChunkInFreeList = freeListHead;
|
|
Me@50
|
401 //next Higher has to be set to top of chunk, so can calc size in malloc
|
|
msach@76
|
402 firstChunk->nextHigherInMem = (void*)( (uintptr_t)firstChunk +
|
|
Me@53
|
403 MALLOC_ADDITIONAL_MEM_FROM_OS_SIZE);
|
|
Me@50
|
404 firstChunk->nextLowerInMem = NULL; //identifies as bott of heap
|
|
Me@53
|
405
|
|
Me@53
|
406 _VMSMasterEnv->amtOfOutstandingMem = 0; //none allocated yet
|
|
Me@50
|
407
|
|
Me@50
|
408 return freeListHead;
|
|
Me@50
|
409 }
|
|
Me@50
|
410
|
|
Me@50
|
411
|
|
Me@50
|
412 /*Designed to be called from the main thread outside of VMS, during cleanup
|
|
Me@50
|
413 */
|
|
Me@50
|
414 void
|
|
Me@50
|
415 VMS_ext__free_free_list( MallocProlog *freeListHead )
|
|
Me@50
|
416 {
|
|
Me@50
|
417 //stashed a ptr to the one and only bug chunk malloc'd from OS in the
|
|
Me@50
|
418 // free list head's next lower in mem pointer
|
|
Me@50
|
419 free( freeListHead->nextLowerInMem );
|
|
Me@50
|
420
|
|
Me@50
|
421 //don't free the head -- it'll be in an array eventually -- free whole
|
|
Me@50
|
422 // array when all the free lists linked from it have already been freed
|
|
Me@50
|
423 }
|
|
Me@50
|
424
|
