annotate src/share/vm/utilities/workgroup.cpp @ 4095:bca17e38de00

6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads Summary: Select number of GC threads dynamically based on heap usage and number of Java threads Reviewed-by: johnc, ysr, jcoomes
author jmasa
date Tue, 09 Aug 2011 10:16:01 -0700
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children 441e946dc1af
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1 /*
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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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.
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22 *
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23 */
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24
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25 #include "precompiled.hpp"
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26 #include "memory/allocation.hpp"
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27 #include "memory/allocation.inline.hpp"
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28 #include "runtime/os.hpp"
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29 #include "utilities/workgroup.hpp"
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30
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31 // Definitions of WorkGang methods.
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32
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33 AbstractWorkGang::AbstractWorkGang(const char* name,
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34 bool are_GC_task_threads,
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35 bool are_ConcurrentGC_threads) :
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36 _name(name),
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37 _are_GC_task_threads(are_GC_task_threads),
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38 _are_ConcurrentGC_threads(are_ConcurrentGC_threads) {
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39
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40 assert(!(are_GC_task_threads && are_ConcurrentGC_threads),
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41 "They cannot both be STW GC and Concurrent threads" );
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42
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43 // Other initialization.
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44 _monitor = new Monitor(/* priority */ Mutex::leaf,
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45 /* name */ "WorkGroup monitor",
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46 /* allow_vm_block */ are_GC_task_threads);
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47 assert(monitor() != NULL, "Failed to allocate monitor");
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48 _terminate = false;
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49 _task = NULL;
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50 _sequence_number = 0;
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51 _started_workers = 0;
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52 _finished_workers = 0;
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53 }
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54
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55 WorkGang::WorkGang(const char* name,
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56 int workers,
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57 bool are_GC_task_threads,
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58 bool are_ConcurrentGC_threads) :
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59 AbstractWorkGang(name, are_GC_task_threads, are_ConcurrentGC_threads) {
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60 _total_workers = workers;
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61 }
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62
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63 GangWorker* WorkGang::allocate_worker(int which) {
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64 GangWorker* new_worker = new GangWorker(this, which);
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65 return new_worker;
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66 }
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67
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68 // The current implementation will exit if the allocation
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69 // of any worker fails. Still, return a boolean so that
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70 // a future implementation can possibly do a partial
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71 // initialization of the workers and report such to the
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72 // caller.
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73 bool WorkGang::initialize_workers() {
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74
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75 if (TraceWorkGang) {
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76 tty->print_cr("Constructing work gang %s with %d threads",
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77 name(),
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78 total_workers());
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79 }
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80 _gang_workers = NEW_C_HEAP_ARRAY(GangWorker*, total_workers());
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81 if (gang_workers() == NULL) {
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82 vm_exit_out_of_memory(0, "Cannot create GangWorker array.");
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83 return false;
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84 }
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85 os::ThreadType worker_type;
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86 if (are_ConcurrentGC_threads()) {
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87 worker_type = os::cgc_thread;
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88 } else {
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89 worker_type = os::pgc_thread;
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90 }
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91 for (int worker = 0; worker < total_workers(); worker += 1) {
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92 GangWorker* new_worker = allocate_worker(worker);
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93 assert(new_worker != NULL, "Failed to allocate GangWorker");
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94 _gang_workers[worker] = new_worker;
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95 if (new_worker == NULL || !os::create_thread(new_worker, worker_type)) {
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96 vm_exit_out_of_memory(0, "Cannot create worker GC thread. Out of system resources.");
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97 return false;
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98 }
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99 if (!DisableStartThread) {
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100 os::start_thread(new_worker);
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101 }
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102 }
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103 return true;
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104 }
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105
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106 AbstractWorkGang::~AbstractWorkGang() {
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107 if (TraceWorkGang) {
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108 tty->print_cr("Destructing work gang %s", name());
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109 }
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110 stop(); // stop all the workers
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111 for (int worker = 0; worker < total_workers(); worker += 1) {
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112 delete gang_worker(worker);
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113 }
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114 delete gang_workers();
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115 delete monitor();
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116 }
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117
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118 GangWorker* AbstractWorkGang::gang_worker(int i) const {
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119 // Array index bounds checking.
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120 GangWorker* result = NULL;
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121 assert(gang_workers() != NULL, "No workers for indexing");
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122 assert(((i >= 0) && (i < total_workers())), "Worker index out of bounds");
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123 result = _gang_workers[i];
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124 assert(result != NULL, "Indexing to null worker");
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125 return result;
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126 }
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127
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128 void WorkGang::run_task(AbstractGangTask* task) {
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129 run_task(task, total_workers());
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130 }
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131
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132 void WorkGang::run_task(AbstractGangTask* task, uint no_of_parallel_workers) {
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133 task->set_for_termination(no_of_parallel_workers);
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134
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135 // This thread is executed by the VM thread which does not block
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136 // on ordinary MutexLocker's.
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137 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag);
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138 if (TraceWorkGang) {
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139 tty->print_cr("Running work gang %s task %s", name(), task->name());
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140 }
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141 // Tell all the workers to run a task.
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142 assert(task != NULL, "Running a null task");
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143 // Initialize.
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144 _task = task;
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145 _sequence_number += 1;
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146 _started_workers = 0;
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147 _finished_workers = 0;
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148 // Tell the workers to get to work.
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149 monitor()->notify_all();
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150 // Wait for them to be finished
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151 while (finished_workers() < (int) no_of_parallel_workers) {
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152 if (TraceWorkGang) {
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153 tty->print_cr("Waiting in work gang %s: %d/%d finished sequence %d",
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154 name(), finished_workers(), no_of_parallel_workers,
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155 _sequence_number);
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156 }
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157 monitor()->wait(/* no_safepoint_check */ true);
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158 }
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159 _task = NULL;
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160 if (TraceWorkGang) {
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161 tty->print_cr("\nFinished work gang %s: %d/%d sequence %d",
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162 name(), finished_workers(), no_of_parallel_workers,
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163 _sequence_number);
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164 Thread* me = Thread::current();
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165 tty->print_cr(" T: 0x%x VM_thread: %d", me, me->is_VM_thread());
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166 }
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167 }
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168
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169 void FlexibleWorkGang::run_task(AbstractGangTask* task) {
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170 // If active_workers() is passed, _finished_workers
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171 // must only be incremented for workers that find non_null
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172 // work (as opposed to all those that just check that the
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173 // task is not null).
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174 WorkGang::run_task(task, (uint) active_workers());
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175 }
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176
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177 void AbstractWorkGang::stop() {
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178 // Tell all workers to terminate, then wait for them to become inactive.
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179 MutexLockerEx ml(monitor(), Mutex::_no_safepoint_check_flag);
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180 if (TraceWorkGang) {
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181 tty->print_cr("Stopping work gang %s task %s", name(), task()->name());
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182 }
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183 _task = NULL;
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184 _terminate = true;
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185 monitor()->notify_all();
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186 while (finished_workers() < active_workers()) {
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187 if (TraceWorkGang) {
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188 tty->print_cr("Waiting in work gang %s: %d/%d finished",
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189 name(), finished_workers(), active_workers());
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190 }
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191 monitor()->wait(/* no_safepoint_check */ true);
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192 }
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193 }
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194
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195 void AbstractWorkGang::internal_worker_poll(WorkData* data) const {
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196 assert(monitor()->owned_by_self(), "worker_poll is an internal method");
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197 assert(data != NULL, "worker data is null");
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198 data->set_terminate(terminate());
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199 data->set_task(task());
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200 data->set_sequence_number(sequence_number());
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201 }
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202
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203 void AbstractWorkGang::internal_note_start() {
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204 assert(monitor()->owned_by_self(), "note_finish is an internal method");
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205 _started_workers += 1;
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206 }
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207
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208 void AbstractWorkGang::internal_note_finish() {
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209 assert(monitor()->owned_by_self(), "note_finish is an internal method");
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210 _finished_workers += 1;
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211 }
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212
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213 void AbstractWorkGang::print_worker_threads_on(outputStream* st) const {
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214 uint num_thr = total_workers();
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215 for (uint i = 0; i < num_thr; i++) {
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216 gang_worker(i)->print_on(st);
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217 st->cr();
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218 }
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219 }
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220
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221 void AbstractWorkGang::threads_do(ThreadClosure* tc) const {
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222 assert(tc != NULL, "Null ThreadClosure");
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223 uint num_thr = total_workers();
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224 for (uint i = 0; i < num_thr; i++) {
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225 tc->do_thread(gang_worker(i));
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226 }
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227 }
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228
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229 // GangWorker methods.
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230
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231 GangWorker::GangWorker(AbstractWorkGang* gang, uint id) {
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232 _gang = gang;
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233 set_id(id);
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234 set_name("Gang worker#%d (%s)", id, gang->name());
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235 }
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236
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237 void GangWorker::run() {
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238 initialize();
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239 loop();
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240 }
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241
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242 void GangWorker::initialize() {
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243 this->initialize_thread_local_storage();
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244 assert(_gang != NULL, "No gang to run in");
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245 os::set_priority(this, NearMaxPriority);
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246 if (TraceWorkGang) {
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247 tty->print_cr("Running gang worker for gang %s id %d",
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248 gang()->name(), id());
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249 }
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250 // The VM thread should not execute here because MutexLocker's are used
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251 // as (opposed to MutexLockerEx's).
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252 assert(!Thread::current()->is_VM_thread(), "VM thread should not be part"
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253 " of a work gang");
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254 }
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255
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256 void GangWorker::loop() {
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257 int previous_sequence_number = 0;
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258 Monitor* gang_monitor = gang()->monitor();
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259 for ( ; /* !terminate() */; ) {
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260 WorkData data;
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261 int part; // Initialized below.
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262 {
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263 // Grab the gang mutex.
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264 MutexLocker ml(gang_monitor);
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265 // Wait for something to do.
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266 // Polling outside the while { wait } avoids missed notifies
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267 // in the outer loop.
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268 gang()->internal_worker_poll(&data);
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269 if (TraceWorkGang) {
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270 tty->print("Polled outside for work in gang %s worker %d",
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271 gang()->name(), id());
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272 tty->print(" terminate: %s",
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273 data.terminate() ? "true" : "false");
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274 tty->print(" sequence: %d (prev: %d)",
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275 data.sequence_number(), previous_sequence_number);
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276 if (data.task() != NULL) {
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277 tty->print(" task: %s", data.task()->name());
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278 } else {
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279 tty->print(" task: NULL");
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280 }
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281 tty->cr();
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282 }
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283 for ( ; /* break or return */; ) {
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284 // Terminate if requested.
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285 if (data.terminate()) {
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286 gang()->internal_note_finish();
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287 gang_monitor->notify_all();
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288 return;
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289 }
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290 // Check for new work.
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291 if ((data.task() != NULL) &&
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292 (data.sequence_number() != previous_sequence_number)) {
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293 if (gang()->needs_more_workers()) {
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294 gang()->internal_note_start();
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295 gang_monitor->notify_all();
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296 part = gang()->started_workers() - 1;
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297 break;
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298 }
0
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299 }
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300 // Nothing to do.
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301 gang_monitor->wait(/* no_safepoint_check */ true);
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302 gang()->internal_worker_poll(&data);
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303 if (TraceWorkGang) {
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304 tty->print("Polled inside for work in gang %s worker %d",
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305 gang()->name(), id());
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306 tty->print(" terminate: %s",
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307 data.terminate() ? "true" : "false");
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308 tty->print(" sequence: %d (prev: %d)",
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309 data.sequence_number(), previous_sequence_number);
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310 if (data.task() != NULL) {
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311 tty->print(" task: %s", data.task()->name());
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312 } else {
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313 tty->print(" task: NULL");
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314 }
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315 tty->cr();
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316 }
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317 }
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318 // Drop gang mutex.
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319 }
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320 if (TraceWorkGang) {
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321 tty->print("Work for work gang %s id %d task %s part %d",
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322 gang()->name(), id(), data.task()->name(), part);
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323 }
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324 assert(data.task() != NULL, "Got null task");
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325 data.task()->work(part);
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326 {
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327 if (TraceWorkGang) {
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328 tty->print("Finish for work gang %s id %d task %s part %d",
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329 gang()->name(), id(), data.task()->name(), part);
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330 }
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331 // Grab the gang mutex.
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332 MutexLocker ml(gang_monitor);
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333 gang()->internal_note_finish();
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334 // Tell the gang you are done.
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335 gang_monitor->notify_all();
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336 // Drop the gang mutex.
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337 }
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338 previous_sequence_number = data.sequence_number();
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339 }
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340 }
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341
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342 bool GangWorker::is_GC_task_thread() const {
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343 return gang()->are_GC_task_threads();
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344 }
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345
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346 bool GangWorker::is_ConcurrentGC_thread() const {
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347 return gang()->are_ConcurrentGC_threads();
0
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348 }
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349
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350 void GangWorker::print_on(outputStream* st) const {
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351 st->print("\"%s\" ", name());
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352 Thread::print_on(st);
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353 st->cr();
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354 }
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355
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356 // Printing methods
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357
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358 const char* AbstractWorkGang::name() const {
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359 return _name;
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360 }
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361
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362 #ifndef PRODUCT
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363
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364 const char* AbstractGangTask::name() const {
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365 return _name;
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366 }
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367
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368 #endif /* PRODUCT */
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369
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370 // FlexibleWorkGang
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371
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372
0
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373 // *** WorkGangBarrierSync
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374
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375 WorkGangBarrierSync::WorkGangBarrierSync()
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376 : _monitor(Mutex::safepoint, "work gang barrier sync", true),
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377 _n_workers(0), _n_completed(0), _should_reset(false) {
0
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378 }
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379
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380 WorkGangBarrierSync::WorkGangBarrierSync(int n_workers, const char* name)
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381 : _monitor(Mutex::safepoint, name, true),
342
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382 _n_workers(n_workers), _n_completed(0), _should_reset(false) {
0
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383 }
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384
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385 void WorkGangBarrierSync::set_n_workers(int n_workers) {
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386 _n_workers = n_workers;
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387 _n_completed = 0;
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388 _should_reset = false;
0
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389 }
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390
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391 void WorkGangBarrierSync::enter() {
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392 MutexLockerEx x(monitor(), Mutex::_no_safepoint_check_flag);
342
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393 if (should_reset()) {
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394 // The should_reset() was set and we are the first worker to enter
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395 // the sync barrier. We will zero the n_completed() count which
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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396 // effectively resets the barrier.
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397 zero_completed();
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398 set_should_reset(false);
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399 }
0
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400 inc_completed();
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401 if (n_completed() == n_workers()) {
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402 // At this point we would like to reset the barrier to be ready in
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403 // case it is used again. However, we cannot set n_completed() to
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diff changeset
404 // 0, even after the notify_all(), given that some other workers
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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parents: 0
diff changeset
405 // might still be waiting for n_completed() to become ==
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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diff changeset
406 // n_workers(). So, if we set n_completed() to 0, those workers
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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parents: 0
diff changeset
407 // will get stuck (as they will wake up, see that n_completed() !=
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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diff changeset
408 // n_workers() and go back to sleep). Instead, we raise the
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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diff changeset
409 // should_reset() flag and the barrier will be reset the first
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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parents: 0
diff changeset
410 // time a worker enters it again.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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diff changeset
411 set_should_reset(true);
0
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diff changeset
412 monitor()->notify_all();
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
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413 } else {
0
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diff changeset
414 while (n_completed() != n_workers()) {
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parents:
diff changeset
415 monitor()->wait(/* no_safepoint_check */ true);
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parents:
diff changeset
416 }
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parents:
diff changeset
417 }
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parents:
diff changeset
418 }
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419
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parents:
diff changeset
420 // SubTasksDone functions.
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421
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422 SubTasksDone::SubTasksDone(int n) :
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diff changeset
423 _n_tasks(n), _n_threads(1), _tasks(NULL) {
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diff changeset
424 _tasks = NEW_C_HEAP_ARRAY(jint, n);
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parents:
diff changeset
425 guarantee(_tasks != NULL, "alloc failure");
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diff changeset
426 clear();
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parents:
diff changeset
427 }
a61af66fc99e Initial load
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diff changeset
428
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parents:
diff changeset
429 bool SubTasksDone::valid() {
a61af66fc99e Initial load
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diff changeset
430 return _tasks != NULL;
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parents:
diff changeset
431 }
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432
1833
8b10f48633dc 6984287: Regularize how GC parallel workers are specified.
jmasa
parents: 1552
diff changeset
433 void SubTasksDone::set_n_threads(int t) {
0
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parents:
diff changeset
434 assert(_claimed == 0 || _threads_completed == _n_threads,
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diff changeset
435 "should not be called while tasks are being processed!");
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parents:
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436 _n_threads = (t == 0 ? 1 : t);
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parents:
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437 }
a61af66fc99e Initial load
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438
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diff changeset
439 void SubTasksDone::clear() {
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440 for (int i = 0; i < _n_tasks; i++) {
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parents:
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441 _tasks[i] = 0;
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442 }
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443 _threads_completed = 0;
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444 #ifdef ASSERT
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445 _claimed = 0;
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446 #endif
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447 }
a61af66fc99e Initial load
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448
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449 bool SubTasksDone::is_task_claimed(int t) {
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450 assert(0 <= t && t < _n_tasks, "bad task id.");
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451 jint old = _tasks[t];
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452 if (old == 0) {
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453 old = Atomic::cmpxchg(1, &_tasks[t], 0);
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parents:
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454 }
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parents:
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455 assert(_tasks[t] == 1, "What else?");
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456 bool res = old != 0;
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diff changeset
457 #ifdef ASSERT
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458 if (!res) {
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diff changeset
459 assert(_claimed < _n_tasks, "Too many tasks claimed; missing clear?");
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460 Atomic::inc(&_claimed);
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461 }
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462 #endif
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463 return res;
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464 }
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diff changeset
465
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466 void SubTasksDone::all_tasks_completed() {
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467 jint observed = _threads_completed;
a61af66fc99e Initial load
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diff changeset
468 jint old;
a61af66fc99e Initial load
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469 do {
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parents:
diff changeset
470 old = observed;
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parents:
diff changeset
471 observed = Atomic::cmpxchg(old+1, &_threads_completed, old);
a61af66fc99e Initial load
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parents:
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472 } while (observed != old);
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parents:
diff changeset
473 // If this was the last thread checking in, clear the tasks.
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parents:
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474 if (observed+1 == _n_threads) clear();
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parents:
diff changeset
475 }
a61af66fc99e Initial load
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parents:
diff changeset
476
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parents:
diff changeset
477
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parents:
diff changeset
478 SubTasksDone::~SubTasksDone() {
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parents:
diff changeset
479 if (_tasks != NULL) FREE_C_HEAP_ARRAY(jint, _tasks);
a61af66fc99e Initial load
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parents:
diff changeset
480 }
a61af66fc99e Initial load
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parents:
diff changeset
481
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parents:
diff changeset
482 // *** SequentialSubTasksDone
a61af66fc99e Initial load
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parents:
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483
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parents:
diff changeset
484 void SequentialSubTasksDone::clear() {
a61af66fc99e Initial load
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parents:
diff changeset
485 _n_tasks = _n_claimed = 0;
a61af66fc99e Initial load
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parents:
diff changeset
486 _n_threads = _n_completed = 0;
a61af66fc99e Initial load
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parents:
diff changeset
487 }
a61af66fc99e Initial load
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parents:
diff changeset
488
a61af66fc99e Initial load
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parents:
diff changeset
489 bool SequentialSubTasksDone::valid() {
a61af66fc99e Initial load
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parents:
diff changeset
490 return _n_threads > 0;
a61af66fc99e Initial load
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parents:
diff changeset
491 }
a61af66fc99e Initial load
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parents:
diff changeset
492
a61af66fc99e Initial load
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parents:
diff changeset
493 bool SequentialSubTasksDone::is_task_claimed(int& t) {
a61af66fc99e Initial load
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parents:
diff changeset
494 jint* n_claimed_ptr = &_n_claimed;
a61af66fc99e Initial load
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parents:
diff changeset
495 t = *n_claimed_ptr;
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parents:
diff changeset
496 while (t < _n_tasks) {
a61af66fc99e Initial load
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parents:
diff changeset
497 jint res = Atomic::cmpxchg(t+1, n_claimed_ptr, t);
a61af66fc99e Initial load
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parents:
diff changeset
498 if (res == t) {
a61af66fc99e Initial load
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parents:
diff changeset
499 return false;
a61af66fc99e Initial load
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parents:
diff changeset
500 }
a61af66fc99e Initial load
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parents:
diff changeset
501 t = *n_claimed_ptr;
a61af66fc99e Initial load
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parents:
diff changeset
502 }
a61af66fc99e Initial load
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parents:
diff changeset
503 return true;
a61af66fc99e Initial load
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parents:
diff changeset
504 }
a61af66fc99e Initial load
duke
parents:
diff changeset
505
a61af66fc99e Initial load
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parents:
diff changeset
506 bool SequentialSubTasksDone::all_tasks_completed() {
a61af66fc99e Initial load
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parents:
diff changeset
507 jint* n_completed_ptr = &_n_completed;
a61af66fc99e Initial load
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parents:
diff changeset
508 jint complete = *n_completed_ptr;
a61af66fc99e Initial load
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parents:
diff changeset
509 while (true) {
a61af66fc99e Initial load
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parents:
diff changeset
510 jint res = Atomic::cmpxchg(complete+1, n_completed_ptr, complete);
a61af66fc99e Initial load
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parents:
diff changeset
511 if (res == complete) {
a61af66fc99e Initial load
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parents:
diff changeset
512 break;
a61af66fc99e Initial load
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parents:
diff changeset
513 }
a61af66fc99e Initial load
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parents:
diff changeset
514 complete = res;
a61af66fc99e Initial load
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parents:
diff changeset
515 }
a61af66fc99e Initial load
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parents:
diff changeset
516 if (complete+1 == _n_threads) {
a61af66fc99e Initial load
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parents:
diff changeset
517 clear();
a61af66fc99e Initial load
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parents:
diff changeset
518 return true;
a61af66fc99e Initial load
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parents:
diff changeset
519 }
a61af66fc99e Initial load
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parents:
diff changeset
520 return false;
a61af66fc99e Initial load
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parents:
diff changeset
521 }
342
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
522
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
523 bool FreeIdSet::_stat_init = false;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
524 FreeIdSet* FreeIdSet::_sets[NSets];
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
525 bool FreeIdSet::_safepoint;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
526
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
527 FreeIdSet::FreeIdSet(int sz, Monitor* mon) :
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
528 _sz(sz), _mon(mon), _hd(0), _waiters(0), _index(-1), _claimed(0)
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
529 {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
530 _ids = new int[sz];
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
531 for (int i = 0; i < sz; i++) _ids[i] = i+1;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
532 _ids[sz-1] = end_of_list; // end of list.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
533 if (_stat_init) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
534 for (int j = 0; j < NSets; j++) _sets[j] = NULL;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
535 _stat_init = true;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
536 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
537 // Add to sets. (This should happen while the system is still single-threaded.)
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
538 for (int j = 0; j < NSets; j++) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
539 if (_sets[j] == NULL) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
540 _sets[j] = this;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
541 _index = j;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
542 break;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
543 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
544 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
545 guarantee(_index != -1, "Too many FreeIdSets in use!");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
546 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
547
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
548 FreeIdSet::~FreeIdSet() {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
549 _sets[_index] = NULL;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
550 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
551
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
552 void FreeIdSet::set_safepoint(bool b) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
553 _safepoint = b;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
554 if (b) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
555 for (int j = 0; j < NSets; j++) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
556 if (_sets[j] != NULL && _sets[j]->_waiters > 0) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
557 Monitor* mon = _sets[j]->_mon;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
558 mon->lock_without_safepoint_check();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
559 mon->notify_all();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
560 mon->unlock();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
561 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
562 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
563 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
564 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
565
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
566 #define FID_STATS 0
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
567
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
568 int FreeIdSet::claim_par_id() {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
569 #if FID_STATS
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
570 thread_t tslf = thr_self();
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
571 tty->print("claim_par_id[%d]: sz = %d, claimed = %d\n", tslf, _sz, _claimed);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
572 #endif
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
573 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
574 while (!_safepoint && _hd == end_of_list) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
575 _waiters++;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
576 #if FID_STATS
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
577 if (_waiters > 5) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
578 tty->print("claim_par_id waiting[%d]: %d waiters, %d claimed.\n",
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
579 tslf, _waiters, _claimed);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
580 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
581 #endif
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
582 _mon->wait(Mutex::_no_safepoint_check_flag);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
583 _waiters--;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
584 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
585 if (_hd == end_of_list) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
586 #if FID_STATS
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
587 tty->print("claim_par_id[%d]: returning EOL.\n", tslf);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
588 #endif
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
589 return -1;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
590 } else {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
591 int res = _hd;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
592 _hd = _ids[res];
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
593 _ids[res] = claimed; // For debugging.
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
594 _claimed++;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
595 #if FID_STATS
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
596 tty->print("claim_par_id[%d]: returning %d, claimed = %d.\n",
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
597 tslf, res, _claimed);
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
598 #endif
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
599 return res;
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
600 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
601 }
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
602
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
603 bool FreeIdSet::claim_perm_id(int i) {
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
604 assert(0 <= i && i < _sz, "Out of range.");
37f87013dfd8 6711316: Open source the Garbage-First garbage collector
ysr
parents: 0
diff changeset
605 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag);
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606 int prev = end_of_list;
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607 int cur = _hd;
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608 while (cur != end_of_list) {
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609 if (cur == i) {
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610 if (prev == end_of_list) {
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611 _hd = _ids[cur];
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612 } else {
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613 _ids[prev] = _ids[cur];
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614 }
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615 _ids[cur] = claimed;
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616 _claimed++;
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617 return true;
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618 } else {
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619 prev = cur;
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620 cur = _ids[cur];
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621 }
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622 }
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623 return false;
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624
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625 }
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626
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627 void FreeIdSet::release_par_id(int id) {
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628 MutexLockerEx x(_mon, Mutex::_no_safepoint_check_flag);
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629 assert(_ids[id] == claimed, "Precondition.");
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630 _ids[id] = _hd;
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631 _hd = id;
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632 _claimed--;
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633 #if FID_STATS
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634 tty->print("[%d] release_par_id(%d), waiters =%d, claimed = %d.\n",
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635 thr_self(), id, _waiters, _claimed);
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636 #endif
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637 if (_waiters > 0)
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638 // Notify all would be safer, but this is OK, right?
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639 _mon->notify_all();
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640 }