1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2019 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // ready_queue.cfa -- |
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8 | // |
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9 | // Author : Thierry Delisle |
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10 | // Created On : Mon Nov dd 16:29:18 2019 |
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11 | // Last Modified By : |
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12 | // Last Modified On : |
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13 | // Update Count : |
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14 | // |
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15 | |
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16 | #define __cforall_thread__ |
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17 | |
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18 | #include "bits/defs.hfa" |
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19 | #include "kernel_private.hfa" |
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20 | |
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21 | #define _GNU_SOURCE |
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22 | #include "stdlib.hfa" |
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23 | |
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24 | static const size_t cache_line_size = 64; |
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25 | |
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26 | // No overriden function, no environment variable, no define |
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27 | // fall back to a magic number |
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28 | #ifndef __CFA_MAX_PROCESSORS__ |
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29 | #define __CFA_MAX_PROCESSORS__ 128 |
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30 | #endif |
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31 | |
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32 | // returns the maximum number of processors the RWLock support |
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33 | __attribute__((weak)) unsigned __max_processors() { |
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34 | const char * max_cores_s = getenv("CFA_MAX_PROCESSORS"); |
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35 | if(!max_cores_s) { |
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36 | __cfaabi_dbg_print_nolock("No CFA_MAX_PROCESSORS in ENV"); |
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37 | return __CFA_MAX_PROCESSORS__; |
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38 | } |
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39 | |
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40 | char * endptr = 0p; |
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41 | long int max_cores_l = strtol(max_cores_s, &endptr, 10); |
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42 | if(max_cores_l < 1 || max_cores_l > 65535) { |
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43 | __cfaabi_dbg_print_nolock("CFA_MAX_PROCESSORS out of range : %ld", max_cores_l); |
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44 | return __CFA_MAX_PROCESSORS__; |
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45 | } |
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46 | if('\0' != *endptr) { |
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47 | __cfaabi_dbg_print_nolock("CFA_MAX_PROCESSORS not a decimal number : %s", max_cores_s); |
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48 | return __CFA_MAX_PROCESSORS__; |
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49 | } |
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50 | |
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51 | return max_cores_l; |
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52 | } |
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53 | |
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54 | // Picks a random 1 bit in 'mask' according to random number 'rnum'. |
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55 | static inline unsigned rand_bit(unsigned rnum, __cfa_readyQ_mask_t mask) { |
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56 | #if defined( __i386 ) |
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57 | static_assert(sizeof(mask) == 4); |
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58 | unsigned bit = mask ? rnum % __builtin_popcount(mask) : 0; |
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59 | #if !defined(__BMI2__) |
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60 | #error rand_bit not implemented for non __BMI2__ i386 |
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61 | #else |
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62 | uint32_t picked = _pdep_u32(1ul << bit, mask); |
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63 | return picked ? __builtin_ctz(picked) : 0; |
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64 | #endif |
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65 | #elif defined( __x86_64 ) |
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66 | static_assert(sizeof(mask) == 8); |
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67 | unsigned bit = mask ? rnum % __builtin_popcountl(mask) : 0; |
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68 | #if !defined(__BMI2__) |
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69 | uint64_t v = mask; // Input value to find position with rank r. |
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70 | unsigned int r = bit + 1;// Input: bit's desired rank [1-64]. |
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71 | unsigned int s; // Output: Resulting position of bit with rank r [1-64] |
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72 | uint64_t a, b, c, d; // Intermediate temporaries for bit count. |
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73 | unsigned int t; // Bit count temporary. |
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74 | |
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75 | // Do a normal parallel bit count for a 64-bit integer, |
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76 | // but store all intermediate steps. |
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77 | a = v - ((v >> 1) & ~0UL/3); |
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78 | b = (a & ~0UL/5) + ((a >> 2) & ~0UL/5); |
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79 | c = (b + (b >> 4)) & ~0UL/0x11; |
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80 | d = (c + (c >> 8)) & ~0UL/0x101; |
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81 | |
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82 | |
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83 | t = (d >> 32) + (d >> 48); |
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84 | // Now do branchless select! |
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85 | s = 64; |
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86 | s -= ((t - r) & 256) >> 3; r -= (t & ((t - r) >> 8)); |
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87 | t = (d >> (s - 16)) & 0xff; |
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88 | s -= ((t - r) & 256) >> 4; r -= (t & ((t - r) >> 8)); |
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89 | t = (c >> (s - 8)) & 0xf; |
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90 | s -= ((t - r) & 256) >> 5; r -= (t & ((t - r) >> 8)); |
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91 | t = (b >> (s - 4)) & 0x7; |
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92 | s -= ((t - r) & 256) >> 6; r -= (t & ((t - r) >> 8)); |
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93 | t = (a >> (s - 2)) & 0x3; |
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94 | s -= ((t - r) & 256) >> 7; r -= (t & ((t - r) >> 8)); |
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95 | t = (v >> (s - 1)) & 0x1; |
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96 | s -= ((t - r) & 256) >> 8; |
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97 | return s - 1; |
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98 | #else |
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99 | uint64_t picked = _pdep_u64(1ul << bit, mask); |
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100 | return picked ? __builtin_ctzl(picked) : 0; |
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101 | #endif |
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102 | #elif defined( __ARM_ARCH ) |
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103 | #error rand_bit not implemented for arm |
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104 | #else |
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105 | #error uknown hardware architecture |
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106 | #endif |
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107 | } |
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108 | |
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109 | |
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110 | //----------------------------------------------------------------------------- |
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111 | // Helpers used by extract |
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112 | // (_mask_bitsidx() & X) returns a bit index valid for a __cfa_readyQ_mask_t, where X is any integer |
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113 | static inline __cfa_readyQ_mask_t _mask_bitsidx () { return (8 * sizeof(__cfa_readyQ_mask_t)) - 1; } |
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114 | |
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115 | // (X >> _mask_shiftidx()) retuns an index into an array of __cfa_readyQ_mask_t |
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116 | static inline __cfa_readyQ_mask_t _mask_shiftidx() { return (8 * sizeof(__cfa_readyQ_mask_t)) - __builtin_clzl(_mask_bitsidx()); } |
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117 | |
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118 | |
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119 | // Assuming a large bit mask represented as an array of __cfa_readyQ_mask_t |
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120 | // Given an index into the large mask, returns the bit index and which __cfa_readyQ_mask_t index in the array |
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121 | static inline [__cfa_readyQ_mask_t, __cfa_readyQ_mask_t] extract(__cfa_readyQ_mask_t idx) { |
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122 | __cfa_readyQ_mask_t word = idx >> _mask_bitsidx(); |
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123 | __cfa_readyQ_mask_t bit = idx & _mask_shiftidx(); |
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124 | return [bit, word]; |
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125 | } |
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126 | |
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127 | //======================================================================= |
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128 | // Cluster wide reader-writer lock |
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129 | //======================================================================= |
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130 | void ?{}(__clusterRWLock_t & this) { |
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131 | this.max = __max_processors(); |
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132 | this.alloc = 0; |
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133 | this.ready = 0; |
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134 | this.lock = false; |
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135 | this.data = alloc(this.max); |
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136 | |
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137 | /*paranoid*/ verify( 0 == (((uintptr_t)(this.data )) % 64) ); |
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138 | /*paranoid*/ verify( 0 == (((uintptr_t)(this.data + 1)) % 64) ); |
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139 | /*paranoid*/ verify(__atomic_is_lock_free(sizeof(this.alloc), &this.alloc)); |
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140 | /*paranoid*/ verify(__atomic_is_lock_free(sizeof(this.ready), &this.ready)); |
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141 | |
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142 | } |
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143 | void ^?{}(__clusterRWLock_t & this) { |
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144 | free(this.data); |
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145 | } |
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146 | |
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147 | void ?{}( __processor_id & this, struct processor * proc ) { |
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148 | this.handle = proc; |
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149 | this.lock = false; |
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150 | } |
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151 | |
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152 | //======================================================================= |
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153 | // Lock-Free registering/unregistering of threads |
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154 | unsigned doregister( struct cluster * cltr, struct processor * proc ) with(cltr->ready_lock) { |
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155 | // Step - 1 : check if there is already space in the data |
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156 | uint_fast32_t s = ready; |
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157 | |
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158 | // Check among all the ready |
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159 | for(uint_fast32_t i = 0; i < s; i++) { |
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160 | processor * null = 0p; // Re-write every loop since compare thrashes it |
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161 | if( __atomic_load_n(&data[i].handle, (int)__ATOMIC_RELAXED) == null |
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162 | && __atomic_compare_exchange_n( &data[i].handle, &null, proc, false, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) { |
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163 | /*paranoid*/ verify(i < ready); |
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164 | /*paranoid*/ verify(__alignof__(data[i]) == cache_line_size); |
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165 | /*paranoid*/ verify((((uintptr_t)&data[i]) % cache_line_size) == 0); |
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166 | return i; |
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167 | } |
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168 | } |
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169 | |
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170 | if(max <= alloc) abort("Trying to create more than %ud processors", cltr->ready_lock.max); |
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171 | |
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172 | // Step - 2 : F&A to get a new spot in the array. |
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173 | uint_fast32_t n = __atomic_fetch_add(&alloc, 1, __ATOMIC_SEQ_CST); |
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174 | if(max <= n) abort("Trying to create more than %ud processors", cltr->ready_lock.max); |
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175 | |
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176 | // Step - 3 : Mark space as used and then publish it. |
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177 | __processor_id * storage = (__processor_id *)&data[n]; |
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178 | (*storage){ proc }; |
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179 | while(true) { |
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180 | unsigned copy = n; |
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181 | if( __atomic_load_n(&ready, __ATOMIC_RELAXED) == n |
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182 | && __atomic_compare_exchange_n(&ready, ©, n + 1, true, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST)) |
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183 | break; |
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184 | asm volatile("pause"); |
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185 | } |
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186 | |
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187 | // Return new spot. |
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188 | /*paranoid*/ verify(n < ready); |
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189 | /*paranoid*/ verify(__alignof__(data[n]) == cache_line_size); |
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190 | /*paranoid*/ verify((((uintptr_t)&data[n]) % cache_line_size) == 0); |
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191 | return n; |
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192 | } |
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193 | |
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194 | void unregister( struct cluster * cltr, struct processor * proc ) with(cltr->ready_lock) { |
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195 | unsigned id = proc->id; |
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196 | /*paranoid*/ verify(id < ready); |
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197 | /*paranoid*/ verify(proc == __atomic_load_n(&data[id].handle, __ATOMIC_RELAXED)); |
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198 | __atomic_store_n(&data[id].handle, 0p, __ATOMIC_RELEASE); |
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199 | } |
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200 | |
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201 | //----------------------------------------------------------------------- |
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202 | // Writer side : acquire when changing the ready queue, e.g. adding more |
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203 | // queues or removing them. |
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204 | uint_fast32_t ready_mutate_lock( struct cluster & cltr ) with(cltr.ready_lock) { |
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205 | // Step 1 : lock global lock |
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206 | // It is needed to avoid processors that register mid Critical-Section |
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207 | // to simply lock their own lock and enter. |
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208 | __atomic_acquire( &lock ); |
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209 | |
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210 | // Step 2 : lock per-proc lock |
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211 | // Processors that are currently being registered aren't counted |
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212 | // but can't be in read_lock or in the critical section. |
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213 | // All other processors are counted |
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214 | uint_fast32_t s = ready; |
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215 | for(uint_fast32_t i = 0; i < s; i++) { |
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216 | __atomic_acquire( &data[i].lock ); |
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217 | } |
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218 | |
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219 | return s; |
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220 | } |
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221 | |
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222 | void ready_mutate_unlock( struct cluster & cltr, uint_fast32_t last_s ) with(cltr.ready_lock) { |
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223 | // Step 1 : release local locks |
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224 | // This must be done while the global lock is held to avoid |
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225 | // threads that where created mid critical section |
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226 | // to race to lock their local locks and have the writer |
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227 | // immidiately unlock them |
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228 | // Alternative solution : return s in write_lock and pass it to write_unlock |
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229 | for(uint_fast32_t i = 0; i < last_s; i++) { |
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230 | verify(data[i].lock); |
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231 | __atomic_store_n(&data[i].lock, (bool)false, __ATOMIC_RELEASE); |
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232 | } |
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233 | |
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234 | // Step 2 : release global lock |
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235 | /*paranoid*/ assert(true == lock); |
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236 | __atomic_store_n(&lock, (bool)false, __ATOMIC_RELEASE); |
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237 | } |
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238 | |
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239 | //======================================================================= |
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240 | // Intrusive Queue used by ready queue |
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241 | //======================================================================= |
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242 | // Get the head pointer (one before the first element) from the anchor |
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243 | static inline thread_desc * head(const __intrusive_lane_t & this) { |
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244 | thread_desc * rhead = (thread_desc *)( |
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245 | (uintptr_t)( &this.before ) - offsetof( thread_desc, link ) |
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246 | ); |
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247 | /* paranoid */ verify(rhead); |
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248 | return rhead; |
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249 | } |
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250 | |
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251 | // Get the tail pointer (one after the last element) from the anchor |
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252 | static inline thread_desc * tail(const __intrusive_lane_t & this) { |
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253 | thread_desc * rtail = (thread_desc *)( |
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254 | (uintptr_t)( &this.after ) - offsetof( thread_desc, link ) |
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255 | ); |
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256 | /* paranoid */ verify(rtail); |
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257 | return rtail; |
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258 | } |
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259 | |
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260 | // Ctor |
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261 | void ?{}( __intrusive_lane_t & this ) { |
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262 | this.lock = false; |
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263 | this.last_id = -1u; |
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264 | this.count = 0u; |
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265 | |
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266 | this.before.link.prev = 0p; |
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267 | this.before.link.next = tail(this); |
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268 | this.before.link.ts = 0; |
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269 | |
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270 | this.after .link.prev = head(this); |
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271 | this.after .link.next = 0p; |
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272 | this.after .link.ts = 0; |
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273 | |
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274 | #if !defined(__CFA_NO_SCHED_STATS__) |
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275 | this.stat.diff = 0; |
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276 | this.stat.push = 0; |
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277 | this.stat.pop = 0; |
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278 | #endif |
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279 | |
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280 | // We add a boat-load of assertions here because the anchor code is very fragile |
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281 | /* paranoid */ verify(((uintptr_t)( head(this) ) + offsetof( thread_desc, link )) == (uintptr_t)(&this.before)); |
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282 | /* paranoid */ verify(((uintptr_t)( tail(this) ) + offsetof( thread_desc, link )) == (uintptr_t)(&this.after )); |
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283 | /* paranoid */ verify(head(this)->link.prev == 0p ); |
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284 | /* paranoid */ verify(head(this)->link.next == tail(this) ); |
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285 | /* paranoid */ verify(tail(this)->link.next == 0p ); |
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286 | /* paranoid */ verify(tail(this)->link.prev == head(this) ); |
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287 | /* paranoid */ verify(&head(this)->link.prev == &this.before.link.prev ); |
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288 | /* paranoid */ verify(&head(this)->link.next == &this.before.link.next ); |
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289 | /* paranoid */ verify(&tail(this)->link.prev == &this.after .link.prev ); |
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290 | /* paranoid */ verify(&tail(this)->link.next == &this.after .link.next ); |
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291 | /* paranoid */ verify(sizeof(__intrusive_lane_t) == 128); |
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292 | /* paranoid */ verify(sizeof(this) == 128); |
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293 | /* paranoid */ verify(__alignof__(__intrusive_lane_t) == 128); |
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294 | /* paranoid */ verify(__alignof__(this) == 128); |
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295 | /* paranoid */ verifyf(((intptr_t)(&this) % 128) == 0, "Expected address to be aligned %p %% 128 == %zd", &this, ((intptr_t)(&this) % 128)); |
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296 | |
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297 | /* paranoid */ verifyf(_mask_shiftidx() == 6 , "%zu", _mask_shiftidx()); |
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298 | /* paranoid */ verifyf(_mask_bitsidx () == 63, "%zu", _mask_bitsidx()); |
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299 | } |
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300 | |
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301 | // Dtor is trivial |
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302 | void ^?{}( __intrusive_lane_t & this ) { |
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303 | // Make sure the list is empty |
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304 | /* paranoid */ verify(head(this)->link.prev == 0p ); |
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305 | /* paranoid */ verify(head(this)->link.next == tail(this) ); |
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306 | /* paranoid */ verify(tail(this)->link.next == 0p ); |
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307 | /* paranoid */ verify(tail(this)->link.prev == head(this) ); |
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308 | /* paranoid */ verify(this.count == 0u ); |
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309 | } |
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310 | |
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311 | // Push a thread onto this lane |
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312 | // returns true of lane was empty before push, false otherwise |
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313 | bool push(__intrusive_lane_t & this, thread_desc * node) { |
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314 | #if defined(__CFA_WITH_VERIFY__) |
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315 | /* paranoid */ verify(this.lock); |
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316 | /* paranoid */ verify(node->link.ts != 0); |
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317 | /* paranoid */ verify(node->link.next == 0p); |
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318 | /* paranoid */ verify(node->link.prev == 0p); |
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319 | |
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320 | this.count++; |
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321 | |
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322 | if(this.before.link.ts == 0l) { |
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323 | /* paranoid */ verify(tail(this)->link.next == 0p); |
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324 | /* paranoid */ verify(tail(this)->link.prev == head(this)); |
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325 | /* paranoid */ verify(head(this)->link.next == tail(this)); |
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326 | /* paranoid */ verify(head(this)->link.prev == 0p); |
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327 | } |
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328 | #endif |
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329 | |
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330 | // Get the relevant nodes locally |
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331 | thread_desc * tail = tail(this); |
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332 | thread_desc * prev = tail->link.prev; |
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333 | |
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334 | // Do the push |
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335 | node->link.next = tail; |
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336 | node->link.prev = prev; |
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337 | prev->link.next = node; |
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338 | tail->link.prev = node; |
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339 | |
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340 | // Update stats |
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341 | #if !defined(__CFA_NO_SCHED_STATS__) |
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342 | this.stat.diff++; |
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343 | this.stat.push++; |
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344 | #endif |
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345 | |
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346 | verify(node->link.next == tail(this)); |
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347 | |
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348 | // Check if the queue used to be empty |
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349 | if(this.before.link.ts == 0l) { |
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350 | this.before.link.ts = node->link.ts; |
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351 | /* paranoid */ verify(node->link.prev == head(this)); |
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352 | return true; |
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353 | } |
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354 | return false; |
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355 | } |
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356 | |
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357 | // Pop a thread from this lane (must be non-empty) |
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358 | // returns popped |
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359 | // returns true of lane was empty before push, false otherwise |
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360 | [thread_desc *, bool] pop(__intrusive_lane_t & this) { |
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361 | /* paranoid */ verify(this.lock); |
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362 | /* paranoid */ verify(this.before.link.ts != 0ul); |
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363 | |
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364 | // Get anchors locally |
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365 | thread_desc * head = head(this); |
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366 | thread_desc * tail = tail(this); |
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367 | |
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368 | // Get the relevant nodes locally |
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369 | thread_desc * node = head->link.next; |
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370 | thread_desc * next = node->link.next; |
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371 | |
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372 | #if defined(__CFA_WITH_VERIFY__) |
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373 | this.count--; |
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374 | /* paranoid */ verify(node != tail); |
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375 | /* paranoid */ verify(node); |
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376 | #endif |
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377 | |
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378 | // Do the pop |
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379 | head->link.next = next; |
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380 | next->link.prev = head; |
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381 | node->link.[next, prev] = 0p; |
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382 | |
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383 | // Update head time stamp |
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384 | this.before.link.ts = next->link.ts; |
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385 | |
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386 | // Update stats |
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387 | #ifndef __CFA_NO_SCHED_STATS__ |
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388 | this.stat.diff--; |
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389 | this.stat.pop ++; |
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390 | #endif |
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391 | |
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392 | // Check if we emptied list and return accordingly |
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393 | if(next == tail) { |
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394 | /* paranoid */ verify(this.before.link.ts == 0); |
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395 | /* paranoid */ verify(tail(this)->link.next == 0p); |
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396 | /* paranoid */ verify(tail(this)->link.prev == head(this)); |
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397 | /* paranoid */ verify(head(this)->link.next == tail(this)); |
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398 | /* paranoid */ verify(head(this)->link.prev == 0p); |
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399 | return [node, true]; |
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400 | } |
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401 | else { |
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402 | /* paranoid */ verify(next->link.ts != 0); |
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403 | /* paranoid */ verify(this.before.link.ts != 0); |
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404 | return [node, false]; |
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405 | } |
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406 | } |
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407 | |
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408 | // Check whether or not list is empty |
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409 | static inline bool is_empty(__intrusive_lane_t & this) { |
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410 | verify( (this.before.link.ts == 0) == (this.count == 0) ); |
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411 | return this.before.link.ts == 0; |
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412 | } |
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413 | |
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414 | // Return the timestamp |
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415 | static inline unsigned long long ts(__intrusive_lane_t & this) { |
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416 | verify( this.before.link.ts == this.before.link.next->link.ts ); |
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417 | return this.before.link.ts; |
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418 | } |
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419 | |
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420 | //======================================================================= |
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421 | // Cforall Reqdy Queue used by ready queue |
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422 | //======================================================================= |
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423 | |
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424 | // Thread local mirror of ready queue statistics |
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425 | #if !defined(__CFA_NO_STATISTICS__) |
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426 | static __attribute__((aligned(128))) thread_local struct { |
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427 | struct { |
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428 | struct { |
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429 | size_t attempt; |
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430 | size_t success; |
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431 | } push; |
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432 | struct { |
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433 | size_t maskrds; |
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434 | size_t attempt; |
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435 | size_t success; |
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436 | } pop; |
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437 | } pick; |
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438 | struct { |
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439 | size_t value; |
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440 | size_t count; |
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441 | } used; |
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442 | } tls = { |
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443 | /* pick */{ |
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444 | /* push */{ 0, 0 }, |
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445 | /* pop */{ 0, 0, 0 }, |
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446 | }, |
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447 | /* used */{ 0, 0 } |
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448 | }; |
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449 | #endif |
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450 | |
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451 | //----------------------------------------------------------------------- |
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452 | |
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453 | void ?{}(__ready_queue_t & this) with (this) { |
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454 | used.count = 0; |
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455 | for( i ; __cfa_lane_mask_size ) { |
---|
456 | used.mask[i] = 0; |
---|
457 | } |
---|
458 | |
---|
459 | lanes.data = alloc(4); |
---|
460 | for( i; 4 ) { |
---|
461 | (lanes.data[i]){}; |
---|
462 | } |
---|
463 | lanes.count = 4; |
---|
464 | |
---|
465 | #if !defined(__CFA_NO_STATISTICS__) |
---|
466 | global_stats.pick.push.attempt = 0; |
---|
467 | global_stats.pick.push.success = 0; |
---|
468 | global_stats.pick.pop .maskrds = 0; |
---|
469 | global_stats.pick.pop .attempt = 0; |
---|
470 | global_stats.pick.pop .success = 0; |
---|
471 | |
---|
472 | global_stats.used.value = 0; |
---|
473 | global_stats.used.count = 0; |
---|
474 | #endif |
---|
475 | } |
---|
476 | |
---|
477 | void ^?{}(__ready_queue_t & this) with (this) { |
---|
478 | verify( 4 == lanes.count ); |
---|
479 | verify( 0 == used .count ); |
---|
480 | |
---|
481 | for( i; 4 ) { |
---|
482 | ^(lanes.data[i]){}; |
---|
483 | } |
---|
484 | free(lanes.data); |
---|
485 | |
---|
486 | |
---|
487 | #if defined(__CFA_WITH_VERIFY__) |
---|
488 | for( i ; __cfa_lane_mask_size ) { |
---|
489 | assert( 0 == used.mask[i] ); |
---|
490 | } |
---|
491 | #endif |
---|
492 | } |
---|
493 | |
---|
494 | //----------------------------------------------------------------------- |
---|
495 | enum mask_strictness { |
---|
496 | STRICT, |
---|
497 | NOCHECK |
---|
498 | }; |
---|
499 | |
---|
500 | // Set a given bit in the bit mask array |
---|
501 | // strictness determines of the bit had to be cleared before |
---|
502 | static inline void mask_set(__cfa_readyQ_mask_t * mask, unsigned index, mask_strictness strict) { |
---|
503 | // Extract the array and bit indexes |
---|
504 | __cfa_readyQ_mask_t word; |
---|
505 | __cfa_readyQ_mask_t bit; |
---|
506 | [bit, word] = extract(index); |
---|
507 | |
---|
508 | // Conditional check |
---|
509 | verifyf( |
---|
510 | strict == STRICT && // Conditional check if it was expected to be cleared |
---|
511 | ((mask[word] & (1ull << bit)) == 0), |
---|
512 | "Before set %llu:%llu (%u), %llx & %llx", word, bit, index, mask[word], (1ull << bit) |
---|
513 | ); |
---|
514 | |
---|
515 | // Atomically set the bit |
---|
516 | __attribute__((unused)) bool ret = __atomic_bts(&mask[word], bit); |
---|
517 | |
---|
518 | // Conditional check |
---|
519 | verifyf( |
---|
520 | strict == STRICT && // Conditional check if it was expected to be cleared |
---|
521 | !ret, |
---|
522 | "Bit was not set but bts returned true" |
---|
523 | ); |
---|
524 | |
---|
525 | // Unconditional check |
---|
526 | verifyf( |
---|
527 | (mask[word] & (1ull << bit)) != 0, |
---|
528 | "After set %llu:%llu (%u), %llx & %llx", word, bit, index, mask[word], (1ull << bit) |
---|
529 | ); |
---|
530 | } |
---|
531 | |
---|
532 | static inline void mask_clear(__cfa_readyQ_mask_t * mask, unsigned index, mask_strictness strict) { |
---|
533 | // Extract the array and bit indexes |
---|
534 | __cfa_readyQ_mask_t word; |
---|
535 | __cfa_readyQ_mask_t bit; |
---|
536 | [bit, word] = extract(index); |
---|
537 | |
---|
538 | // Conditional check |
---|
539 | verifyf( |
---|
540 | strict == STRICT && // Conditional check if it was expected to be set |
---|
541 | ((mask[word] & (1ull << bit)) != 0), |
---|
542 | "Before clear %llu:%llu (%u), %llx & %llx", word, bit, index, mask[word], (1ull << bit) |
---|
543 | ); |
---|
544 | |
---|
545 | // Atomically clear the bit |
---|
546 | __attribute__((unused)) bool ret = __atomic_btr(&mask[word], bit); |
---|
547 | |
---|
548 | // Conditional check |
---|
549 | verifyf( |
---|
550 | strict == STRICT && // Conditional check if it was expected to be cleared |
---|
551 | ret, |
---|
552 | "Bit was set but btr returned false" |
---|
553 | ); |
---|
554 | |
---|
555 | // Unconditional check |
---|
556 | verifyf( |
---|
557 | (mask[word] & (1ull << bit)) == 0, |
---|
558 | "After clear %llu:%llu (%u), %llx & %llx", word, bit, index, mask[word], (1ull << bit) |
---|
559 | ); |
---|
560 | } |
---|
561 | |
---|
562 | //----------------------------------------------------------------------- |
---|
563 | __attribute__((hot)) bool push(struct cluster * cltr, struct thread_desc * thrd) with (cltr->ready_queue) { |
---|
564 | // write timestamp |
---|
565 | thrd->link.ts = rdtscl(); |
---|
566 | |
---|
567 | // Try to pick a lane and lock it |
---|
568 | unsigned i; |
---|
569 | do { |
---|
570 | // Pick the index of a lane |
---|
571 | unsigned i = tls_rand() % lanes.count; |
---|
572 | |
---|
573 | #if !defined(__CFA_NO_STATISTICS__) |
---|
574 | tls.pick.push.attempt++; |
---|
575 | #endif |
---|
576 | |
---|
577 | // If we can't lock it retry |
---|
578 | } while( !__atomic_try_acquire( &lanes.data[i].lock ) ); |
---|
579 | |
---|
580 | #if defined(__CFA_WITH_VERIFY__) |
---|
581 | /* paranoid */ verify(lanes.data[i].last_id == -1u); |
---|
582 | /* paranoid */ lanes.data[i].last_id = kernelTLS.this_processor->id; |
---|
583 | #endif |
---|
584 | |
---|
585 | __attribute__((unused)) size_t num = __atomic_load_n( &used.count, __ATOMIC_RELAXED ); |
---|
586 | bool first = false; |
---|
587 | |
---|
588 | // Actually push it |
---|
589 | bool lane_first = push(lanes.data[i], thrd); |
---|
590 | |
---|
591 | // If this lane used to be empty we need to do more |
---|
592 | if(lane_first) { |
---|
593 | // Update the global count |
---|
594 | size_t ret = __atomic_fetch_add( &used.count, 1z, __ATOMIC_SEQ_CST); |
---|
595 | |
---|
596 | // Check if the entire quue used to be empty |
---|
597 | first = (ret == 0); |
---|
598 | |
---|
599 | // Update the bit mask |
---|
600 | mask_set((__cfa_readyQ_mask_t *)used.mask, i, STRICT); |
---|
601 | } |
---|
602 | |
---|
603 | #if defined(__CFA_WITH_VERIFY__) |
---|
604 | /* paranoid */ verifyf( used.count <= lanes.count, "Non-empty count (%zu) exceeds actual count (%zu)\n", used.count, lanes.count ); |
---|
605 | /* paranoid */ verifyf( lanes.data[i].last_id == kernelTLS.this_processor->id, "Expected last processor to lock queue %u to be %u, was %u\n", i, lanes.data[i].last_id, kernelTLS.this_processor->id ); |
---|
606 | /* paranoid */ verifyf( lanes.data[i].lock, "List %u is not locked\n", i ); |
---|
607 | /* paranoid */ lanes.data[i].last_id = -1u; |
---|
608 | #endif |
---|
609 | |
---|
610 | // Unlock and return |
---|
611 | __atomic_unlock( &lanes.data[i].lock ); |
---|
612 | |
---|
613 | // Update statistics |
---|
614 | #if !defined(__CFA_NO_STATISTICS__) |
---|
615 | tls.pick.push.success++; |
---|
616 | tls.used.value += num; |
---|
617 | tls.used.count += 1; |
---|
618 | #endif |
---|
619 | |
---|
620 | // return whether or not the list was empty before this push |
---|
621 | return first; |
---|
622 | } |
---|
623 | |
---|
624 | //----------------------------------------------------------------------- |
---|
625 | // Given 2 indexes, pick the list with the oldest push an try to pop from it |
---|
626 | static struct thread_desc * try_pop(struct cluster * cltr, unsigned i, unsigned j) with (cltr->ready_queue) { |
---|
627 | #if !defined(__CFA_NO_STATISTICS__) |
---|
628 | tls.pick.pop.attempt++; |
---|
629 | #endif |
---|
630 | |
---|
631 | // Pick the bet list |
---|
632 | int w = i; |
---|
633 | if( __builtin_expect(!is_empty(lanes.data[j]), true) ) { |
---|
634 | w = (ts(lanes.data[i]) < ts(lanes.data[j])) ? i : j; |
---|
635 | } |
---|
636 | |
---|
637 | // Get relevant elements locally |
---|
638 | __intrusive_lane_t & lane = lanes.data[w]; |
---|
639 | |
---|
640 | // If list looks empty retry |
---|
641 | if( is_empty(lane) ) return 0p; |
---|
642 | |
---|
643 | // If we can't get the lock retry |
---|
644 | if( !__atomic_try_acquire(&lane.lock) ) return 0p; |
---|
645 | |
---|
646 | #if defined(__CFA_WITH_VERIFY__) |
---|
647 | /* paranoid */ verify(lane.last_id == -1u); |
---|
648 | /* paranoid */ lane.last_id = kernelTLS.this_processor->id; |
---|
649 | #endif |
---|
650 | |
---|
651 | |
---|
652 | // If list is empty, unlock and retry |
---|
653 | if( is_empty(lane) ) { |
---|
654 | #if defined(__CFA_WITH_VERIFY__) |
---|
655 | /* paranoid */ verify(lane.last_id == kernelTLS.this_processor->id); |
---|
656 | /* paranoid */ lane.last_id = -1u; |
---|
657 | #endif |
---|
658 | |
---|
659 | __atomic_unlock(&lane.lock); |
---|
660 | return 0p; |
---|
661 | } |
---|
662 | |
---|
663 | // Actually pop the list |
---|
664 | struct thread_desc * thrd; |
---|
665 | bool emptied; |
---|
666 | [thrd, emptied] = pop(lane); |
---|
667 | |
---|
668 | /* paranoid */ verify(thrd); |
---|
669 | /* paranoid */ verify(lane.last_id == kernelTLS.this_processor->id); |
---|
670 | /* paranoid */ verify(lane.lock); |
---|
671 | |
---|
672 | // If this was the last element in the lane |
---|
673 | if(emptied) { |
---|
674 | // Update the global count |
---|
675 | __atomic_fetch_sub( &used.count, 1z, __ATOMIC_SEQ_CST); |
---|
676 | |
---|
677 | // Update the bit mask |
---|
678 | mask_clear((__cfa_readyQ_mask_t *)used.mask, w, STRICT); |
---|
679 | } |
---|
680 | |
---|
681 | #if defined(__CFA_WITH_VERIFY__) |
---|
682 | /* paranoid */ verify(lane.last_id == kernelTLS.this_processor->id); |
---|
683 | /* paranoid */ lane.last_id = -1u; |
---|
684 | #endif |
---|
685 | |
---|
686 | // For statistics, check the count before we release the lock |
---|
687 | #if !defined(__CFA_NO_STATISTICS__) |
---|
688 | int num = __atomic_load_n( &used.count, __ATOMIC_RELAXED ); |
---|
689 | #endif |
---|
690 | |
---|
691 | // Unlock and return |
---|
692 | __atomic_unlock(&lane.lock); |
---|
693 | |
---|
694 | // Update statistics |
---|
695 | #if !defined(__CFA_NO_STATISTICS__) |
---|
696 | tls.pick.pop.success++; |
---|
697 | tls.used.value += num; |
---|
698 | tls.used.count += 1; |
---|
699 | #endif |
---|
700 | |
---|
701 | // return the popped thread |
---|
702 | return thrd; |
---|
703 | } |
---|
704 | |
---|
705 | // Pop from the ready queue from a given cluster |
---|
706 | __attribute__((hot)) thread_desc * pop(struct cluster * cltr) with (cltr->ready_queue) { |
---|
707 | /* paranoid */ verify( lanes.count > 0 ); |
---|
708 | |
---|
709 | // As long as the list is not empty, try finding a lane that isn't empty and pop from it |
---|
710 | while( __atomic_load_n( &used.count, __ATOMIC_RELAXED ) != 0) { |
---|
711 | #if !defined(__CFA_READQ_NO_BITMASK__) |
---|
712 | // If using bit masks |
---|
713 | #if !defined(__CFA_NO_SCHED_STATS__) |
---|
714 | tls.pick.pop.maskrds++; |
---|
715 | #endif |
---|
716 | |
---|
717 | // Pick two lists at random |
---|
718 | unsigned ri = tls_rand(); |
---|
719 | unsigned rj = tls_rand(); |
---|
720 | |
---|
721 | // Find which __cfa_readyQ_mask_t the two lists belong |
---|
722 | unsigned num = ((__atomic_load_n( &lanes.count, __ATOMIC_RELAXED ) - 1) >> 6) + 1; |
---|
723 | unsigned wdxi = (ri >> 6u) % num; |
---|
724 | unsigned wdxj = (rj >> 6u) % num; |
---|
725 | |
---|
726 | // Get the actual __cfa_readyQ_mask_t |
---|
727 | size_t maski = __atomic_load_n( &used.mask[wdxi], __ATOMIC_RELAXED ); |
---|
728 | size_t maskj = __atomic_load_n( &used.mask[wdxj], __ATOMIC_RELAXED ); |
---|
729 | |
---|
730 | // If both of these masks are empty, retry |
---|
731 | if(maski == 0 && maskj == 0) continue; |
---|
732 | |
---|
733 | // Pick one of the non-zero bits in the masks and get the bit indexes |
---|
734 | unsigned bi = rand_bit(ri, maski); |
---|
735 | unsigned bj = rand_bit(rj, maskj); |
---|
736 | |
---|
737 | // some checks |
---|
738 | /* paranoid */ verifyf(bi < 64, "%zu %u", maski, bi); |
---|
739 | /* paranoid */ verifyf(bj < 64, "%zu %u", maskj, bj); |
---|
740 | |
---|
741 | // get the general list index |
---|
742 | unsigned i = bi | (wdxi << 6); |
---|
743 | unsigned j = bj | (wdxj << 6); |
---|
744 | |
---|
745 | // some more checks |
---|
746 | /* paranoid */ verifyf(i < lanes.count, "%u", wdxi << 6); |
---|
747 | /* paranoid */ verifyf(j < lanes.count, "%u", wdxj << 6); |
---|
748 | |
---|
749 | // try popping from the 2 picked lists |
---|
750 | struct thread_desc * thrd = try_pop(cltr, i, j); |
---|
751 | if(thrd) return thrd; |
---|
752 | #else |
---|
753 | // Pick two lists at random |
---|
754 | int i = tls_rand() % __atomic_load_n( &lanes.count, __ATOMIC_RELAXED ); |
---|
755 | int j = tls_rand() % __atomic_load_n( &lanes.count, __ATOMIC_RELAXED ); |
---|
756 | |
---|
757 | // try popping from the 2 picked lists |
---|
758 | struct thread_desc * thrd = try_pop(cltr, i, j); |
---|
759 | if(thrd) return thrd; |
---|
760 | #endif |
---|
761 | } |
---|
762 | |
---|
763 | // All lanes where empty return 0p |
---|
764 | return 0p; |
---|
765 | } |
---|
766 | |
---|
767 | //----------------------------------------------------------------------- |
---|
768 | |
---|
769 | static void check( __ready_queue_t & q ) with (q) { |
---|
770 | #if defined(__CFA_WITH_VERIFY__) |
---|
771 | { |
---|
772 | int idx = 0; |
---|
773 | for( w ; __cfa_lane_mask_size ) { |
---|
774 | for( b ; 8 * sizeof(__cfa_readyQ_mask_t) ) { |
---|
775 | bool is_empty = idx < lanes.count ? (ts(lanes.data[idx]) == 0) : true; |
---|
776 | bool should_be_empty = 0 == (used.mask[w] & (1z << b)); |
---|
777 | assertf(should_be_empty == is_empty, "Inconsistent list %d, mask expect : %d, actual is got %d", idx, should_be_empty, (bool)is_empty); |
---|
778 | assert(__cfa_max_lanes > idx); |
---|
779 | idx++; |
---|
780 | } |
---|
781 | } |
---|
782 | } |
---|
783 | |
---|
784 | { |
---|
785 | for( idx ; lanes.count ) { |
---|
786 | __intrusive_lane_t & sl = lanes.data[idx]; |
---|
787 | assert(!lanes.data[idx].lock); |
---|
788 | |
---|
789 | assert(head(sl)->link.prev == 0p ); |
---|
790 | assert(head(sl)->link.next->link.prev == head(sl) ); |
---|
791 | assert(tail(sl)->link.next == 0p ); |
---|
792 | assert(tail(sl)->link.prev->link.next == tail(sl) ); |
---|
793 | |
---|
794 | if(sl.before.link.ts == 0l) { |
---|
795 | assert(tail(sl)->link.next == 0p); |
---|
796 | assert(tail(sl)->link.prev == head(sl)); |
---|
797 | assert(head(sl)->link.next == tail(sl)); |
---|
798 | assert(head(sl)->link.prev == 0p); |
---|
799 | } |
---|
800 | } |
---|
801 | } |
---|
802 | #endif |
---|
803 | } |
---|
804 | |
---|
805 | // Call this function of the intrusive list was moved using memcpy |
---|
806 | // fixes the list so that the pointers back to anchors aren't left dangling |
---|
807 | static inline void fix(__intrusive_lane_t & ll) { |
---|
808 | // if the list is not empty then follow he pointer and fix its reverse |
---|
809 | if(!is_empty(ll)) { |
---|
810 | head(ll)->link.next->link.prev = head(ll); |
---|
811 | tail(ll)->link.prev->link.next = tail(ll); |
---|
812 | } |
---|
813 | // Otherwise just reset the list |
---|
814 | else { |
---|
815 | verify(tail(ll)->link.next == 0p); |
---|
816 | tail(ll)->link.prev = head(ll); |
---|
817 | head(ll)->link.next = tail(ll); |
---|
818 | verify(head(ll)->link.prev == 0p); |
---|
819 | } |
---|
820 | } |
---|
821 | |
---|
822 | // Grow the ready queue |
---|
823 | void ready_queue_grow (struct cluster * cltr) { |
---|
824 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
825 | uint_fast32_t last_size = ready_mutate_lock( *cltr ); |
---|
826 | |
---|
827 | __cfaabi_dbg_print_safe("Kernel : Growing ready queue\n"); |
---|
828 | |
---|
829 | // Make sure that everything is consistent |
---|
830 | /* paranoid */ check( cltr->ready_queue ); |
---|
831 | |
---|
832 | // grow the ready queue |
---|
833 | with( cltr->ready_queue ) { |
---|
834 | size_t ncount = lanes.count; |
---|
835 | |
---|
836 | // Check that we have some space left |
---|
837 | if(ncount + 4 >= __cfa_max_lanes) abort("Program attempted to create more than maximum number of Ready Queues (%zu)", __cfa_max_lanes); |
---|
838 | |
---|
839 | // increase count |
---|
840 | ncount += 4; |
---|
841 | |
---|
842 | // Allocate new array (uses realloc and memcpies the data) |
---|
843 | lanes.data = alloc(lanes.data, ncount); |
---|
844 | |
---|
845 | // Fix the moved data |
---|
846 | for( idx; (size_t)lanes.count ) { |
---|
847 | fix(lanes.data[idx]); |
---|
848 | } |
---|
849 | |
---|
850 | // Construct new data |
---|
851 | for( idx; (size_t)lanes.count ~ ncount) { |
---|
852 | (lanes.data[idx]){}; |
---|
853 | } |
---|
854 | |
---|
855 | // Update original |
---|
856 | lanes.count = ncount; |
---|
857 | |
---|
858 | // fields in 'used' don't need to change when growing |
---|
859 | } |
---|
860 | |
---|
861 | // Make sure that everything is consistent |
---|
862 | /* paranoid */ check( cltr->ready_queue ); |
---|
863 | |
---|
864 | __cfaabi_dbg_print_safe("Kernel : Growing ready queue done\n"); |
---|
865 | |
---|
866 | // Unlock the RWlock |
---|
867 | ready_mutate_unlock( *cltr, last_size ); |
---|
868 | } |
---|
869 | |
---|
870 | // Shrink the ready queue |
---|
871 | void ready_queue_shrink(struct cluster * cltr) { |
---|
872 | // Lock the RWlock so no-one pushes/pops while we are changing the queue |
---|
873 | uint_fast32_t last_size = ready_mutate_lock( *cltr ); |
---|
874 | |
---|
875 | __cfaabi_dbg_print_safe("Kernel : Shrinking ready queue\n"); |
---|
876 | |
---|
877 | // Make sure that everything is consistent |
---|
878 | /* paranoid */ check( cltr->ready_queue ); |
---|
879 | |
---|
880 | with( cltr->ready_queue ) { |
---|
881 | // Make sure that the total thread count stays the same |
---|
882 | #if defined(__CFA_WITH_VERIFY__) |
---|
883 | size_t nthreads = 0; |
---|
884 | for( idx; (size_t)lanes.count ) { |
---|
885 | nthreads += lanes.data[idx].count; |
---|
886 | } |
---|
887 | #endif |
---|
888 | |
---|
889 | size_t ocount = lanes.count; |
---|
890 | // Check that we have some space left |
---|
891 | if(ocount < 8) abort("Program attempted to destroy more Ready Queues than were created"); |
---|
892 | |
---|
893 | // reduce the actual count so push doesn't use the old queues |
---|
894 | lanes.count -= 4; |
---|
895 | verify(ocount > lanes.count); |
---|
896 | |
---|
897 | // for printing count the number of displaced threads |
---|
898 | #if defined(__CFA_DEBUG_PRINT__) |
---|
899 | __attribute__((unused)) size_t displaced = 0; |
---|
900 | #endif |
---|
901 | |
---|
902 | // redistribute old data |
---|
903 | for( idx; (size_t)lanes.count ~ ocount) { |
---|
904 | // Lock is not strictly needed but makes checking invariants much easier |
---|
905 | bool locked = __atomic_try_acquire(&lanes.data[idx].lock); |
---|
906 | verify(locked); |
---|
907 | |
---|
908 | // As long as we can pop from this lane to push the threads somewhere else in the queue |
---|
909 | while(!is_empty(lanes.data[idx])) { |
---|
910 | struct thread_desc * thrd; |
---|
911 | __attribute__((unused)) bool _; |
---|
912 | [thrd, _] = pop(lanes.data[idx]); |
---|
913 | |
---|
914 | push(cltr, thrd); |
---|
915 | |
---|
916 | // for printing count the number of displaced threads |
---|
917 | #if defined(__CFA_DEBUG_PRINT__) |
---|
918 | displaced++; |
---|
919 | #endif |
---|
920 | } |
---|
921 | |
---|
922 | mask_clear((__cfa_readyQ_mask_t *)used.mask, idx, NOCHECK); |
---|
923 | |
---|
924 | // Unlock the lane |
---|
925 | __atomic_unlock(&lanes.data[idx].lock); |
---|
926 | |
---|
927 | // TODO print the queue statistics here |
---|
928 | |
---|
929 | ^(lanes.data[idx]){}; |
---|
930 | } |
---|
931 | |
---|
932 | __cfaabi_dbg_print_safe("Kernel : Shrinking ready queue displaced %zu threads\n", displaced); |
---|
933 | |
---|
934 | // recompute the used.count instead of maintaining it |
---|
935 | used.count = 0; |
---|
936 | for( i ; __cfa_lane_mask_size ) { |
---|
937 | used.count += __builtin_popcountl(used.mask[i]); |
---|
938 | } |
---|
939 | |
---|
940 | // Allocate new array (uses realloc and memcpies the data) |
---|
941 | lanes.data = alloc(lanes.data, lanes.count); |
---|
942 | |
---|
943 | // Fix the moved data |
---|
944 | for( idx; (size_t)lanes.count ) { |
---|
945 | fix(lanes.data[idx]); |
---|
946 | } |
---|
947 | |
---|
948 | // Make sure that the total thread count stayed the same |
---|
949 | #if defined(__CFA_WITH_VERIFY__) |
---|
950 | for( idx; (size_t)lanes.count ) { |
---|
951 | nthreads -= lanes.data[idx].count; |
---|
952 | } |
---|
953 | verifyf(nthreads == 0, "Shrinking changed number of threads"); |
---|
954 | #endif |
---|
955 | } |
---|
956 | |
---|
957 | // Make sure that everything is consistent |
---|
958 | /* paranoid */ check( cltr->ready_queue ); |
---|
959 | |
---|
960 | __cfaabi_dbg_print_safe("Kernel : Shrinking ready queue done\n"); |
---|
961 | |
---|
962 | // Unlock the RWlock |
---|
963 | ready_mutate_unlock( *cltr, last_size ); |
---|
964 | } |
---|
965 | |
---|
966 | //----------------------------------------------------------------------- |
---|
967 | |
---|
968 | #if !defined(__CFA_NO_STATISTICS__) |
---|
969 | void stats_tls_tally(struct cluster * cltr) with (cltr->ready_queue) { |
---|
970 | __atomic_fetch_add( &global_stats.pick.push.attempt, tls.pick.push.attempt, __ATOMIC_SEQ_CST ); |
---|
971 | __atomic_fetch_add( &global_stats.pick.push.success, tls.pick.push.success, __ATOMIC_SEQ_CST ); |
---|
972 | __atomic_fetch_add( &global_stats.pick.pop .maskrds, tls.pick.pop .maskrds, __ATOMIC_SEQ_CST ); |
---|
973 | __atomic_fetch_add( &global_stats.pick.pop .attempt, tls.pick.pop .attempt, __ATOMIC_SEQ_CST ); |
---|
974 | __atomic_fetch_add( &global_stats.pick.pop .success, tls.pick.pop .success, __ATOMIC_SEQ_CST ); |
---|
975 | |
---|
976 | __atomic_fetch_add( &global_stats.used.value, tls.used.value, __ATOMIC_SEQ_CST ); |
---|
977 | __atomic_fetch_add( &global_stats.used.count, tls.used.count, __ATOMIC_SEQ_CST ); |
---|
978 | } |
---|
979 | #endif |
---|