Mercurial > hg > truffle
annotate src/share/vm/utilities/taskqueue.cpp @ 4712:e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
Summary: Replaces calls to os::javaTimeMillis(), which does not (and cannot) guarantee monotonicity, in GC code to an equivalent expression that uses os::javaTimeNanos(). os::javaTimeNanos is guaranteed monotonically non-decreasing if the underlying platform provides a monotonic time source. Changes in OS files are to make use of the newly defined constants in globalDefinitions.hpp.
Reviewed-by: dholmes, ysr
author | johnc |
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date | Mon, 19 Dec 2011 10:02:05 -0800 |
parents | f08d439fab8c |
children | f34d701e952e |
rev | line source |
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0 | 1 /* |
1638 | 2 * Copyright (c) 2001, 2010, 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 * | |
1552
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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" | |
28 #include "utilities/debug.hpp" | |
29 #include "utilities/stack.inline.hpp" | |
30 #include "utilities/taskqueue.hpp" | |
31 #ifdef TARGET_OS_FAMILY_linux | |
32 # include "thread_linux.inline.hpp" | |
33 #endif | |
34 #ifdef TARGET_OS_FAMILY_solaris | |
35 # include "thread_solaris.inline.hpp" | |
36 #endif | |
37 #ifdef TARGET_OS_FAMILY_windows | |
38 # include "thread_windows.inline.hpp" | |
39 #endif | |
3960 | 40 #ifdef TARGET_OS_FAMILY_bsd |
41 # include "thread_bsd.inline.hpp" | |
42 #endif | |
0 | 43 |
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44 #ifdef TRACESPINNING |
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45 uint ParallelTaskTerminator::_total_yields = 0; |
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46 uint ParallelTaskTerminator::_total_spins = 0; |
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47 uint ParallelTaskTerminator::_total_peeks = 0; |
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48 #endif |
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49 |
1665 | 50 #if TASKQUEUE_STATS |
51 const char * const TaskQueueStats::_names[last_stat_id] = { | |
52 "qpush", "qpop", "qpop-s", "qattempt", "qsteal", "opush", "omax" | |
53 }; | |
54 | |
1709 | 55 TaskQueueStats & TaskQueueStats::operator +=(const TaskQueueStats & addend) |
56 { | |
57 for (unsigned int i = 0; i < last_stat_id; ++i) { | |
58 _stats[i] += addend._stats[i]; | |
59 } | |
60 return *this; | |
61 } | |
62 | |
1665 | 63 void TaskQueueStats::print_header(unsigned int line, outputStream* const stream, |
64 unsigned int width) | |
65 { | |
66 // Use a width w: 1 <= w <= max_width | |
67 const unsigned int max_width = 40; | |
68 const unsigned int w = MAX2(MIN2(width, max_width), 1U); | |
69 | |
70 if (line == 0) { // spaces equal in width to the header | |
71 const unsigned int hdr_width = w * last_stat_id + last_stat_id - 1; | |
72 stream->print("%*s", hdr_width, " "); | |
73 } else if (line == 1) { // labels | |
74 stream->print("%*s", w, _names[0]); | |
75 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
76 stream->print(" %*s", w, _names[i]); | |
77 } | |
78 } else if (line == 2) { // dashed lines | |
79 char dashes[max_width + 1]; | |
80 memset(dashes, '-', w); | |
81 dashes[w] = '\0'; | |
82 stream->print("%s", dashes); | |
83 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
84 stream->print(" %s", dashes); | |
85 } | |
86 } | |
87 } | |
88 | |
89 void TaskQueueStats::print(outputStream* stream, unsigned int width) const | |
90 { | |
91 #define FMT SIZE_FORMAT_W(*) | |
92 stream->print(FMT, width, _stats[0]); | |
93 for (unsigned int i = 1; i < last_stat_id; ++i) { | |
94 stream->print(" " FMT, width, _stats[i]); | |
95 } | |
96 #undef FMT | |
97 } | |
1709 | 98 |
99 #ifdef ASSERT | |
100 // Invariants which should hold after a TaskQueue has been emptied and is | |
101 // quiescent; they do not hold at arbitrary times. | |
102 void TaskQueueStats::verify() const | |
103 { | |
104 assert(get(push) == get(pop) + get(steal), | |
105 err_msg("push=" SIZE_FORMAT " pop=" SIZE_FORMAT " steal=" SIZE_FORMAT, | |
106 get(push), get(pop), get(steal))); | |
107 assert(get(pop_slow) <= get(pop), | |
108 err_msg("pop_slow=" SIZE_FORMAT " pop=" SIZE_FORMAT, | |
109 get(pop_slow), get(pop))); | |
110 assert(get(steal) <= get(steal_attempt), | |
111 err_msg("steal=" SIZE_FORMAT " steal_attempt=" SIZE_FORMAT, | |
112 get(steal), get(steal_attempt))); | |
113 assert(get(overflow) == 0 || get(push) != 0, | |
114 err_msg("overflow=" SIZE_FORMAT " push=" SIZE_FORMAT, | |
115 get(overflow), get(push))); | |
116 assert(get(overflow_max_len) == 0 || get(overflow) != 0, | |
117 err_msg("overflow_max_len=" SIZE_FORMAT " overflow=" SIZE_FORMAT, | |
118 get(overflow_max_len), get(overflow))); | |
119 } | |
120 #endif // ASSERT | |
1665 | 121 #endif // TASKQUEUE_STATS |
122 | |
0 | 123 int TaskQueueSetSuper::randomParkAndMiller(int *seed0) { |
124 const int a = 16807; | |
125 const int m = 2147483647; | |
126 const int q = 127773; /* m div a */ | |
127 const int r = 2836; /* m mod a */ | |
128 assert(sizeof(int) == 4, "I think this relies on that"); | |
129 int seed = *seed0; | |
130 int hi = seed / q; | |
131 int lo = seed % q; | |
132 int test = a * lo - r * hi; | |
133 if (test > 0) | |
134 seed = test; | |
135 else | |
136 seed = test + m; | |
137 *seed0 = seed; | |
138 return seed; | |
139 } | |
140 | |
141 ParallelTaskTerminator:: | |
142 ParallelTaskTerminator(int n_threads, TaskQueueSetSuper* queue_set) : | |
143 _n_threads(n_threads), | |
144 _queue_set(queue_set), | |
145 _offered_termination(0) {} | |
146 | |
147 bool ParallelTaskTerminator::peek_in_queue_set() { | |
148 return _queue_set->peek(); | |
149 } | |
150 | |
151 void ParallelTaskTerminator::yield() { | |
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152 assert(_offered_termination <= _n_threads, "Invariant"); |
0 | 153 os::yield(); |
154 } | |
155 | |
156 void ParallelTaskTerminator::sleep(uint millis) { | |
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157 assert(_offered_termination <= _n_threads, "Invariant"); |
0 | 158 os::sleep(Thread::current(), millis, false); |
159 } | |
160 | |
342 | 161 bool |
162 ParallelTaskTerminator::offer_termination(TerminatorTerminator* terminator) { | |
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163 assert(_n_threads > 0, "Initialization is incorrect"); |
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164 assert(_offered_termination < _n_threads, "Invariant"); |
0 | 165 Atomic::inc(&_offered_termination); |
166 | |
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167 uint yield_count = 0; |
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168 // Number of hard spin loops done since last yield |
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169 uint hard_spin_count = 0; |
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170 // Number of iterations in the hard spin loop. |
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171 uint hard_spin_limit = WorkStealingHardSpins; |
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172 |
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173 // If WorkStealingSpinToYieldRatio is 0, no hard spinning is done. |
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174 // If it is greater than 0, then start with a small number |
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175 // of spins and increase number with each turn at spinning until |
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176 // the count of hard spins exceeds WorkStealingSpinToYieldRatio. |
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177 // Then do a yield() call and start spinning afresh. |
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178 if (WorkStealingSpinToYieldRatio > 0) { |
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179 hard_spin_limit = WorkStealingHardSpins >> WorkStealingSpinToYieldRatio; |
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180 hard_spin_limit = MAX2(hard_spin_limit, 1U); |
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181 } |
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182 // Remember the initial spin limit. |
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183 uint hard_spin_start = hard_spin_limit; |
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184 |
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185 // Loop waiting for all threads to offer termination or |
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186 // more work. |
0 | 187 while (true) { |
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188 assert(_offered_termination <= _n_threads, "Invariant"); |
546
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189 // Are all threads offering termination? |
0 | 190 if (_offered_termination == _n_threads) { |
191 return true; | |
192 } else { | |
546
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193 // Look for more work. |
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194 // Periodically sleep() instead of yield() to give threads |
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195 // waiting on the cores the chance to grab this code |
0 | 196 if (yield_count <= WorkStealingYieldsBeforeSleep) { |
546
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197 // Do a yield or hardspin. For purposes of deciding whether |
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198 // to sleep, count this as a yield. |
0 | 199 yield_count++; |
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200 |
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201 // Periodically call yield() instead spinning |
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202 // After WorkStealingSpinToYieldRatio spins, do a yield() call |
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203 // and reset the counts and starting limit. |
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204 if (hard_spin_count > WorkStealingSpinToYieldRatio) { |
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205 yield(); |
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206 hard_spin_count = 0; |
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207 hard_spin_limit = hard_spin_start; |
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208 #ifdef TRACESPINNING |
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209 _total_yields++; |
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210 #endif |
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211 } else { |
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212 // Hard spin this time |
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213 // Increase the hard spinning period but only up to a limit. |
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214 hard_spin_limit = MIN2(2*hard_spin_limit, |
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215 (uint) WorkStealingHardSpins); |
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216 for (uint j = 0; j < hard_spin_limit; j++) { |
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217 SpinPause(); |
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218 } |
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219 hard_spin_count++; |
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220 #ifdef TRACESPINNING |
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221 _total_spins++; |
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222 #endif |
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223 } |
0 | 224 } else { |
225 if (PrintGCDetails && Verbose) { | |
226 gclog_or_tty->print_cr("ParallelTaskTerminator::offer_termination() " | |
227 "thread %d sleeps after %d yields", | |
228 Thread::current(), yield_count); | |
229 } | |
230 yield_count = 0; | |
231 // A sleep will cause this processor to seek work on another processor's | |
232 // runqueue, if it has nothing else to run (as opposed to the yield | |
233 // which may only move the thread to the end of the this processor's | |
234 // runqueue). | |
235 sleep(WorkStealingSleepMillis); | |
236 } | |
237 | |
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238 #ifdef TRACESPINNING |
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239 _total_peeks++; |
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240 #endif |
342 | 241 if (peek_in_queue_set() || |
242 (terminator != NULL && terminator->should_exit_termination())) { | |
0 | 243 Atomic::dec(&_offered_termination); |
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244 assert(_offered_termination < _n_threads, "Invariant"); |
0 | 245 return false; |
246 } | |
247 } | |
248 } | |
249 } | |
250 | |
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251 #ifdef TRACESPINNING |
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252 void ParallelTaskTerminator::print_termination_counts() { |
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253 gclog_or_tty->print_cr("ParallelTaskTerminator Total yields: %lld " |
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254 "Total spins: %lld Total peeks: %lld", |
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255 total_yields(), |
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256 total_spins(), |
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257 total_peeks()); |
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258 } |
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259 #endif |
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260 |
0 | 261 void ParallelTaskTerminator::reset_for_reuse() { |
262 if (_offered_termination != 0) { | |
263 assert(_offered_termination == _n_threads, | |
264 "Terminator may still be in use"); | |
265 _offered_termination = 0; | |
266 } | |
267 } | |
268 | |
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269 #ifdef ASSERT |
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270 bool ObjArrayTask::is_valid() const { |
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271 return _obj != NULL && _obj->is_objArray() && _index > 0 && |
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272 _index < objArrayOop(_obj)->length(); |
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273 } |
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274 #endif // ASSERT |
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275 |
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276 void ParallelTaskTerminator::reset_for_reuse(int n_threads) { |
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277 reset_for_reuse(); |
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278 _n_threads = n_threads; |
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279 } |