Mercurial > hg > truffle
annotate src/share/vm/utilities/taskqueue.cpp @ 17937:78bbf4d43a14
8037816: Fix for 8036122 breaks build with Xcode5/clang
8043029: Change 8037816 breaks HS build with older GCC versions which don't support diagnostic pragmas
8043164: Format warning in traceStream.hpp
Summary: Backport of main fix + two corrections, enables clang compilation, turns on format attributes, corrects/mutes warnings
Reviewed-by: kvn, coleenp, iveresov, twisti
| author | drchase |
|---|---|
| date | Thu, 22 May 2014 15:52:41 -0400 |
| parents | 203f64878aab |
| children |
| rev | line source |
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| 0 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "oops/oop.inline.hpp" | |
| 27 #include "runtime/os.hpp" | |
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28 #include "runtime/thread.inline.hpp" |
| 1972 | 29 #include "utilities/debug.hpp" |
| 30 #include "utilities/stack.inline.hpp" | |
| 31 #include "utilities/taskqueue.hpp" | |
| 0 | 32 |
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33 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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34 |
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35 #ifdef TRACESPINNING |
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36 uint ParallelTaskTerminator::_total_yields = 0; |
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37 uint ParallelTaskTerminator::_total_spins = 0; |
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38 uint ParallelTaskTerminator::_total_peeks = 0; |
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39 #endif |
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40 |
| 1665 | 41 #if TASKQUEUE_STATS |
| 42 const char * const TaskQueueStats::_names[last_stat_id] = { | |
| 43 "qpush", "qpop", "qpop-s", "qattempt", "qsteal", "opush", "omax" | |
| 44 }; | |
| 45 | |
| 1709 | 46 TaskQueueStats & TaskQueueStats::operator +=(const TaskQueueStats & addend) |
| 47 { | |
| 48 for (unsigned int i = 0; i < last_stat_id; ++i) { | |
| 49 _stats[i] += addend._stats[i]; | |
| 50 } | |
| 51 return *this; | |
| 52 } | |
| 53 | |
| 1665 | 54 void TaskQueueStats::print_header(unsigned int line, outputStream* const stream, |
| 55 unsigned int width) | |
| 56 { | |
| 57 // Use a width w: 1 <= w <= max_width | |
| 58 const unsigned int max_width = 40; | |
| 59 const unsigned int w = MAX2(MIN2(width, max_width), 1U); | |
| 60 | |
| 61 if (line == 0) { // spaces equal in width to the header | |
| 62 const unsigned int hdr_width = w * last_stat_id + last_stat_id - 1; | |
| 63 stream->print("%*s", hdr_width, " "); | |
| 64 } else if (line == 1) { // labels | |
| 65 stream->print("%*s", w, _names[0]); | |
| 66 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 67 stream->print(" %*s", w, _names[i]); | |
| 68 } | |
| 69 } else if (line == 2) { // dashed lines | |
| 70 char dashes[max_width + 1]; | |
| 71 memset(dashes, '-', w); | |
| 72 dashes[w] = '\0'; | |
| 73 stream->print("%s", dashes); | |
| 74 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 75 stream->print(" %s", dashes); | |
| 76 } | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 void TaskQueueStats::print(outputStream* stream, unsigned int width) const | |
| 81 { | |
| 82 #define FMT SIZE_FORMAT_W(*) | |
| 83 stream->print(FMT, width, _stats[0]); | |
| 84 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
| 85 stream->print(" " FMT, width, _stats[i]); | |
| 86 } | |
| 87 #undef FMT | |
| 88 } | |
| 1709 | 89 |
| 90 #ifdef ASSERT | |
| 91 // Invariants which should hold after a TaskQueue has been emptied and is | |
| 92 // quiescent; they do not hold at arbitrary times. | |
| 93 void TaskQueueStats::verify() const | |
| 94 { | |
| 95 assert(get(push) == get(pop) + get(steal), | |
| 96 err_msg("push=" SIZE_FORMAT " pop=" SIZE_FORMAT " steal=" SIZE_FORMAT, | |
| 97 get(push), get(pop), get(steal))); | |
| 98 assert(get(pop_slow) <= get(pop), | |
| 99 err_msg("pop_slow=" SIZE_FORMAT " pop=" SIZE_FORMAT, | |
| 100 get(pop_slow), get(pop))); | |
| 101 assert(get(steal) <= get(steal_attempt), | |
| 102 err_msg("steal=" SIZE_FORMAT " steal_attempt=" SIZE_FORMAT, | |
| 103 get(steal), get(steal_attempt))); | |
| 104 assert(get(overflow) == 0 || get(push) != 0, | |
| 105 err_msg("overflow=" SIZE_FORMAT " push=" SIZE_FORMAT, | |
| 106 get(overflow), get(push))); | |
| 107 assert(get(overflow_max_len) == 0 || get(overflow) != 0, | |
| 108 err_msg("overflow_max_len=" SIZE_FORMAT " overflow=" SIZE_FORMAT, | |
| 109 get(overflow_max_len), get(overflow))); | |
| 110 } | |
| 111 #endif // ASSERT | |
| 1665 | 112 #endif // TASKQUEUE_STATS |
| 113 | |
| 0 | 114 int TaskQueueSetSuper::randomParkAndMiller(int *seed0) { |
| 115 const int a = 16807; | |
| 116 const int m = 2147483647; | |
| 117 const int q = 127773; /* m div a */ | |
| 118 const int r = 2836; /* m mod a */ | |
| 119 assert(sizeof(int) == 4, "I think this relies on that"); | |
| 120 int seed = *seed0; | |
| 121 int hi = seed / q; | |
| 122 int lo = seed % q; | |
| 123 int test = a * lo - r * hi; | |
| 124 if (test > 0) | |
| 125 seed = test; | |
| 126 else | |
| 127 seed = test + m; | |
| 128 *seed0 = seed; | |
| 129 return seed; | |
| 130 } | |
| 131 | |
| 132 ParallelTaskTerminator:: | |
| 133 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set) : | |
| 134 _n_threads(n_threads), | |
| 135 _queue_set(queue_set), | |
| 136 _offered_termination(0) {} | |
| 137 | |
| 138 bool ParallelTaskTerminator::peek_in_queue_set() { | |
| 139 return _queue_set->peek(); | |
| 140 } | |
| 141 | |
| 142 void ParallelTaskTerminator::yield() { | |
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143 assert(_offered_termination <= _n_threads, "Invariant"); |
| 0 | 144 os::yield(); |
| 145 } | |
| 146 | |
| 147 void ParallelTaskTerminator::sleep(uint millis) { | |
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148 assert(_offered_termination <= _n_threads, "Invariant"); |
| 0 | 149 os::sleep(Thread::current(), millis, false); |
| 150 } | |
| 151 | |
| 342 | 152 bool |
| 153 ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) { | |
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154 assert(_n_threads > 0, "Initialization is incorrect"); |
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155 assert(_offered_termination < _n_threads, "Invariant"); |
| 0 | 156 Atomic::inc(&_offered_termination); |
| 157 | |
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158 uint yield_count = 0; |
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159 // Number of hard spin loops done since last yield |
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160 uint hard_spin_count = 0; |
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161 // Number of iterations in the hard spin loop. |
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162 uint hard_spin_limit = WorkStealingHardSpins; |
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163 |
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164 // If WorkStealingSpinToYieldRatio is 0, no hard spinning is done. |
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165 // If it is greater than 0, then start with a small number |
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166 // of spins and increase number with each turn at spinning until |
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167 // the count of hard spins exceeds WorkStealingSpinToYieldRatio. |
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168 // Then do a yield() call and start spinning afresh. |
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169 if (WorkStealingSpinToYieldRatio > 0) { |
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170 hard_spin_limit = WorkStealingHardSpins >> WorkStealingSpinToYieldRatio; |
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171 hard_spin_limit = MAX2(hard_spin_limit, 1U); |
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172 } |
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173 // Remember the initial spin limit. |
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174 uint hard_spin_start = hard_spin_limit; |
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175 |
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176 // Loop waiting for all threads to offer termination or |
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177 // more work. |
| 0 | 178 while (true) { |
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179 assert(_offered_termination <= _n_threads, "Invariant"); |
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180 // Are all threads offering termination? |
| 0 | 181 if (_offered_termination == _n_threads) { |
| 182 return true; | |
| 183 } else { | |
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184 // Look for more work. |
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185 // Periodically sleep() instead of yield() to give threads |
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186 // waiting on the cores the chance to grab this code |
| 0 | 187 if (yield_count <= WorkStealingYieldsBeforeSleep) { |
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188 // Do a yield or hardspin. For purposes of deciding whether |
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189 // to sleep, count this as a yield. |
| 0 | 190 yield_count++; |
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191 |
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192 // Periodically call yield() instead spinning |
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193 // After WorkStealingSpinToYieldRatio spins, do a yield() call |
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194 // and reset the counts and starting limit. |
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195 if (hard_spin_count > WorkStealingSpinToYieldRatio) { |
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196 yield(); |
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197 hard_spin_count = 0; |
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198 hard_spin_limit = hard_spin_start; |
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199 #ifdef TRACESPINNING |
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200 _total_yields++; |
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201 #endif |
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202 } else { |
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203 // Hard spin this time |
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204 // Increase the hard spinning period but only up to a limit. |
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205 hard_spin_limit = MIN2(2*hard_spin_limit, |
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206 (uint) WorkStealingHardSpins); |
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207 for (uint j = 0; j < hard_spin_limit; j++) { |
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208 SpinPause(); |
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209 } |
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210 hard_spin_count++; |
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211 #ifdef TRACESPINNING |
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212 _total_spins++; |
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213 #endif |
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214 } |
| 0 | 215 } else { |
| 216 if (PrintGCDetails && Verbose) { | |
| 217 gclog_or_tty->print_cr("ParallelTaskTerminator::offer_termination() " | |
| 218 "thread %d sleeps after %d yields", | |
| 219 Thread::current(), yield_count); | |
| 220 } | |
| 221 yield_count = 0; | |
| 222 // A sleep will cause this processor to seek work on another processor's | |
| 223 // runqueue, if it has nothing else to run (as opposed to the yield | |
| 224 // which may only move the thread to the end of the this processor's | |
| 225 // runqueue). | |
| 226 sleep(WorkStealingSleepMillis); | |
| 227 } | |
| 228 | |
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229 #ifdef TRACESPINNING |
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230 _total_peeks++; |
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231 #endif |
| 342 | 232 if (peek_in_queue_set() || |
| 233 (terminator != NULL && terminator->should_exit_termination())) { | |
| 0 | 234 Atomic::dec(&_offered_termination); |
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235 assert(_offered_termination < _n_threads, "Invariant"); |
| 0 | 236 return false; |
| 237 } | |
| 238 } | |
| 239 } | |
| 240 } | |
| 241 | |
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242 #ifdef TRACESPINNING |
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243 void ParallelTaskTerminator::print_termination_counts() { |
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244 gclog_or_tty->print_cr("ParallelTaskTerminator Total yields: " UINT32_FORMAT |
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245 " Total spins: " UINT32_FORMAT " Total peeks: " UINT32_FORMAT, |
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246 total_yields(), |
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247 total_spins(), |
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248 total_peeks()); |
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249 } |
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250 #endif |
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251 |
| 0 | 252 void ParallelTaskTerminator::reset_for_reuse() { |
| 253 if (_offered_termination != 0) { | |
| 254 assert(_offered_termination == _n_threads, | |
| 255 "Terminator may still be in use"); | |
| 256 _offered_termination = 0; | |
| 257 } | |
| 258 } | |
| 259 | |
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260 #ifdef ASSERT |
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261 bool ObjArrayTask::is_valid() const { |
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262 return _obj != NULL && _obj->is_objArray() && _index > 0 && |
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263 _index < objArrayOop(_obj)->length(); |
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264 } |
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265 #endif // ASSERT |
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266 |
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267 void ParallelTaskTerminator::reset_for_reuse(int n_threads) { |
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268 reset_for_reuse(); |
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269 _n_threads = n_threads; |
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270 } |