annotate src/share/vm/memory/threadLocalAllocBuffer.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 cfd4aac53239
children 52b4284cb496 060cdf93040c
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1 /*
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2 * Copyright (c) 1999, 2014, 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/genCollectedHeap.hpp"
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27 #include "memory/resourceArea.hpp"
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28 #include "memory/threadLocalAllocBuffer.inline.hpp"
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29 #include "memory/universe.inline.hpp"
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30 #include "oops/oop.inline.hpp"
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31 #include "runtime/thread.inline.hpp"
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32 #include "utilities/copy.hpp"
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33
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34 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC
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35
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36 // Thread-Local Edens support
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37
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38 // static member initialization
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39 size_t ThreadLocalAllocBuffer::_max_size = 0;
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40 unsigned ThreadLocalAllocBuffer::_target_refills = 0;
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41 GlobalTLABStats* ThreadLocalAllocBuffer::_global_stats = NULL;
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42
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43 void ThreadLocalAllocBuffer::clear_before_allocation() {
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44 _slow_refill_waste += (unsigned)remaining();
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45 make_parsable(true); // also retire the TLAB
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46 }
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47
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48 void ThreadLocalAllocBuffer::accumulate_statistics_before_gc() {
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49 global_stats()->initialize();
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50
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51 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
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52 thread->tlab().accumulate_statistics();
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53 thread->tlab().initialize_statistics();
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54 }
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55
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56 // Publish new stats if some allocation occurred.
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57 if (global_stats()->allocation() != 0) {
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58 global_stats()->publish();
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59 if (PrintTLAB) {
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60 global_stats()->print();
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61 }
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62 }
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63 }
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64
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65 void ThreadLocalAllocBuffer::accumulate_statistics() {
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66 Thread* thread = myThread();
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67 size_t capacity = Universe::heap()->tlab_capacity(thread);
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68 size_t used = Universe::heap()->tlab_used(thread);
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69
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70 _gc_waste += (unsigned)remaining();
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71 size_t total_allocated = thread->allocated_bytes();
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72 size_t allocated_since_last_gc = total_allocated - _allocated_before_last_gc;
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73 _allocated_before_last_gc = total_allocated;
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74
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75 if (PrintTLAB && (_number_of_refills > 0 || Verbose)) {
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76 print_stats("gc");
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77 }
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78
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79 if (_number_of_refills > 0) {
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80 // Update allocation history if a reasonable amount of eden was allocated.
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81 bool update_allocation_history = used > 0.5 * capacity;
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82
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83 if (update_allocation_history) {
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84 // Average the fraction of eden allocated in a tlab by this
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85 // thread for use in the next resize operation.
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86 // _gc_waste is not subtracted because it's included in
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87 // "used".
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88 // The result can be larger than 1.0 due to direct to old allocations.
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89 // These allocations should ideally not be counted but since it is not possible
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90 // to filter them out here we just cap the fraction to be at most 1.0.
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91 double alloc_frac = MIN2(1.0, (double) allocated_since_last_gc / used);
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92 _allocation_fraction.sample(alloc_frac);
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93 }
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94 global_stats()->update_allocating_threads();
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95 global_stats()->update_number_of_refills(_number_of_refills);
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96 global_stats()->update_allocation(_number_of_refills * desired_size());
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97 global_stats()->update_gc_waste(_gc_waste);
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98 global_stats()->update_slow_refill_waste(_slow_refill_waste);
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99 global_stats()->update_fast_refill_waste(_fast_refill_waste);
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100
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101 } else {
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102 assert(_number_of_refills == 0 && _fast_refill_waste == 0 &&
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103 _slow_refill_waste == 0 && _gc_waste == 0,
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104 "tlab stats == 0");
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105 }
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106 global_stats()->update_slow_allocations(_slow_allocations);
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107 }
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108
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109 // Fills the current tlab with a dummy filler array to create
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110 // an illusion of a contiguous Eden and optionally retires the tlab.
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111 // Waste accounting should be done in caller as appropriate; see,
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112 // for example, clear_before_allocation().
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113 void ThreadLocalAllocBuffer::make_parsable(bool retire) {
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114 if (end() != NULL) {
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115 invariants();
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116
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117 if (retire) {
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118 myThread()->incr_allocated_bytes(used_bytes());
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119 }
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120
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121 CollectedHeap::fill_with_object(top(), hard_end(), retire);
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122
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123 if (retire || ZeroTLAB) { // "Reset" the TLAB
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124 set_start(NULL);
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125 set_top(NULL);
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126 set_pf_top(NULL);
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127 set_end(NULL);
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128 }
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129 }
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130 assert(!(retire || ZeroTLAB) ||
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131 (start() == NULL && end() == NULL && top() == NULL),
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132 "TLAB must be reset");
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133 }
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134
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135 void ThreadLocalAllocBuffer::resize_all_tlabs() {
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136 if (ResizeTLAB) {
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137 for (JavaThread *thread = Threads::first(); thread != NULL; thread = thread->next()) {
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138 thread->tlab().resize();
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139 }
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140 }
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141 }
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142
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143 void ThreadLocalAllocBuffer::resize() {
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144 // Compute the next tlab size using expected allocation amount
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145 assert(ResizeTLAB, "Should not call this otherwise");
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146 size_t alloc = (size_t)(_allocation_fraction.average() *
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147 (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize));
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148 size_t new_size = alloc / _target_refills;
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149
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150 new_size = MIN2(MAX2(new_size, min_size()), max_size());
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151
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152 size_t aligned_new_size = align_object_size(new_size);
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153
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154 if (PrintTLAB && Verbose) {
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155 gclog_or_tty->print("TLAB new size: thread: " INTPTR_FORMAT " [id: %2d]"
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156 " refills %d alloc: %8.6f desired_size: " SIZE_FORMAT " -> " SIZE_FORMAT "\n",
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157 myThread(), myThread()->osthread()->thread_id(),
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158 _target_refills, _allocation_fraction.average(), desired_size(), aligned_new_size);
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159 }
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160 set_desired_size(aligned_new_size);
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161 set_refill_waste_limit(initial_refill_waste_limit());
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162 }
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163
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164 void ThreadLocalAllocBuffer::initialize_statistics() {
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165 _number_of_refills = 0;
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166 _fast_refill_waste = 0;
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167 _slow_refill_waste = 0;
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168 _gc_waste = 0;
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169 _slow_allocations = 0;
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170 }
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171
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172 void ThreadLocalAllocBuffer::fill(HeapWord* start,
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173 HeapWord* top,
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174 size_t new_size) {
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175 _number_of_refills++;
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176 if (PrintTLAB && Verbose) {
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177 print_stats("fill");
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178 }
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179 assert(top <= start + new_size - alignment_reserve(), "size too small");
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180 initialize(start, top, start + new_size - alignment_reserve());
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181
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182 // Reset amount of internal fragmentation
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183 set_refill_waste_limit(initial_refill_waste_limit());
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184 }
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185
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186 void ThreadLocalAllocBuffer::initialize(HeapWord* start,
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187 HeapWord* top,
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188 HeapWord* end) {
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189 set_start(start);
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190 set_top(top);
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191 set_pf_top(top);
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192 set_end(end);
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193 invariants();
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194 }
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195
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196 void ThreadLocalAllocBuffer::initialize() {
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197 initialize(NULL, // start
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198 NULL, // top
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199 NULL); // end
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200
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201 set_desired_size(initial_desired_size());
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202
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203 // Following check is needed because at startup the main (primordial)
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204 // thread is initialized before the heap is. The initialization for
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205 // this thread is redone in startup_initialization below.
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206 if (Universe::heap() != NULL) {
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207 size_t capacity = Universe::heap()->tlab_capacity(myThread()) / HeapWordSize;
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208 double alloc_frac = desired_size() * target_refills() / (double) capacity;
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209 _allocation_fraction.sample(alloc_frac);
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210 }
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211
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212 set_refill_waste_limit(initial_refill_waste_limit());
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213
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214 initialize_statistics();
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215 }
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216
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217 void ThreadLocalAllocBuffer::startup_initialization() {
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218
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219 // Assuming each thread's active tlab is, on average,
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220 // 1/2 full at a GC
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221 _target_refills = 100 / (2 * TLABWasteTargetPercent);
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222 _target_refills = MAX2(_target_refills, (unsigned)1U);
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223
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224 _global_stats = new GlobalTLABStats();
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225
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226 // During jvm startup, the main (primordial) thread is initialized
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227 // before the heap is initialized. So reinitialize it now.
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228 guarantee(Thread::current()->is_Java_thread(), "tlab initialization thread not Java thread");
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229 Thread::current()->tlab().initialize();
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230
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231 if (PrintTLAB && Verbose) {
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232 gclog_or_tty->print("TLAB min: " SIZE_FORMAT " initial: " SIZE_FORMAT " max: " SIZE_FORMAT "\n",
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233 min_size(), Thread::current()->tlab().initial_desired_size(), max_size());
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234 }
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235 }
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236
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237 size_t ThreadLocalAllocBuffer::initial_desired_size() {
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238 size_t init_sz;
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239
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240 if (TLABSize > 0) {
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241 init_sz = MIN2(TLABSize / HeapWordSize, max_size());
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242 } else if (global_stats() == NULL) {
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243 // Startup issue - main thread initialized before heap initialized.
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244 init_sz = min_size();
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245 } else {
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246 // Initial size is a function of the average number of allocating threads.
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247 unsigned nof_threads = global_stats()->allocating_threads_avg();
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248
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249 init_sz = (Universe::heap()->tlab_capacity(myThread()) / HeapWordSize) /
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250 (nof_threads * target_refills());
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251 init_sz = align_object_size(init_sz);
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252 init_sz = MIN2(MAX2(init_sz, min_size()), max_size());
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253 }
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254 return init_sz;
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255 }
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256
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257 void ThreadLocalAllocBuffer::print_stats(const char* tag) {
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258 Thread* thrd = myThread();
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259 size_t waste = _gc_waste + _slow_refill_waste + _fast_refill_waste;
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260 size_t alloc = _number_of_refills * _desired_size;
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261 double waste_percent = alloc == 0 ? 0.0 :
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262 100.0 * waste / alloc;
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cfd4aac53239 8030177: G1: Enable TLAB resizing
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263 size_t tlab_used = Universe::heap()->tlab_used(thrd);
0
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264 gclog_or_tty->print("TLAB: %s thread: " INTPTR_FORMAT " [id: %2d]"
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265 " desired_size: " SIZE_FORMAT "KB"
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266 " slow allocs: %d refill waste: " SIZE_FORMAT "B"
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267 " alloc:%8.5f %8.0fKB refills: %d waste %4.1f%% gc: %dB"
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268 " slow: %dB fast: %dB\n",
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269 tag, thrd, thrd->osthread()->thread_id(),
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270 _desired_size / (K / HeapWordSize),
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271 _slow_allocations, _refill_waste_limit * HeapWordSize,
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272 _allocation_fraction.average(),
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273 _allocation_fraction.average() * tlab_used / K,
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274 _number_of_refills, waste_percent,
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275 _gc_waste * HeapWordSize,
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276 _slow_refill_waste * HeapWordSize,
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277 _fast_refill_waste * HeapWordSize);
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278 }
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279
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280 void ThreadLocalAllocBuffer::verify() {
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281 HeapWord* p = start();
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282 HeapWord* t = top();
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283 HeapWord* prev_p = NULL;
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284 while (p < t) {
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285 oop(p)->verify();
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286 prev_p = p;
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287 p += oop(p)->size();
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288 }
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289 guarantee(p == top(), "end of last object must match end of space");
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290 }
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291
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292 Thread* ThreadLocalAllocBuffer::myThread() {
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293 return (Thread*)(((char *)this) +
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294 in_bytes(start_offset()) -
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295 in_bytes(Thread::tlab_start_offset()));
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296 }
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297
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298
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299 GlobalTLABStats::GlobalTLABStats() :
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300 _allocating_threads_avg(TLABAllocationWeight) {
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301
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302 initialize();
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303
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304 _allocating_threads_avg.sample(1); // One allocating thread at startup
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305
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306 if (UsePerfData) {
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307
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308 EXCEPTION_MARK;
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309 ResourceMark rm;
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310
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311 char* cname = PerfDataManager::counter_name("tlab", "allocThreads");
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312 _perf_allocating_threads =
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313 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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314
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315 cname = PerfDataManager::counter_name("tlab", "fills");
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316 _perf_total_refills =
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317 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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318
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319 cname = PerfDataManager::counter_name("tlab", "maxFills");
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320 _perf_max_refills =
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321 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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322
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323 cname = PerfDataManager::counter_name("tlab", "alloc");
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324 _perf_allocation =
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325 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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326
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327 cname = PerfDataManager::counter_name("tlab", "gcWaste");
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328 _perf_gc_waste =
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329 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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330
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331 cname = PerfDataManager::counter_name("tlab", "maxGcWaste");
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332 _perf_max_gc_waste =
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333 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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334
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335 cname = PerfDataManager::counter_name("tlab", "slowWaste");
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336 _perf_slow_refill_waste =
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337 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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338
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339 cname = PerfDataManager::counter_name("tlab", "maxSlowWaste");
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340 _perf_max_slow_refill_waste =
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341 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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342
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343 cname = PerfDataManager::counter_name("tlab", "fastWaste");
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344 _perf_fast_refill_waste =
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345 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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346
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347 cname = PerfDataManager::counter_name("tlab", "maxFastWaste");
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348 _perf_max_fast_refill_waste =
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349 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_Bytes, CHECK);
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350
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351 cname = PerfDataManager::counter_name("tlab", "slowAlloc");
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352 _perf_slow_allocations =
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353 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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354
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355 cname = PerfDataManager::counter_name("tlab", "maxSlowAlloc");
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356 _perf_max_slow_allocations =
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357 PerfDataManager::create_variable(SUN_GC, cname, PerfData::U_None, CHECK);
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358 }
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359 }
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360
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361 void GlobalTLABStats::initialize() {
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362 // Clear counters summarizing info from all threads
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363 _allocating_threads = 0;
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364 _total_refills = 0;
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365 _max_refills = 0;
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366 _total_allocation = 0;
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367 _total_gc_waste = 0;
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368 _max_gc_waste = 0;
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369 _total_slow_refill_waste = 0;
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370 _max_slow_refill_waste = 0;
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371 _total_fast_refill_waste = 0;
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372 _max_fast_refill_waste = 0;
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373 _total_slow_allocations = 0;
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374 _max_slow_allocations = 0;
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375 }
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376
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377 void GlobalTLABStats::publish() {
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378 _allocating_threads_avg.sample(_allocating_threads);
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379 if (UsePerfData) {
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380 _perf_allocating_threads ->set_value(_allocating_threads);
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381 _perf_total_refills ->set_value(_total_refills);
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382 _perf_max_refills ->set_value(_max_refills);
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383 _perf_allocation ->set_value(_total_allocation);
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384 _perf_gc_waste ->set_value(_total_gc_waste);
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385 _perf_max_gc_waste ->set_value(_max_gc_waste);
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386 _perf_slow_refill_waste ->set_value(_total_slow_refill_waste);
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387 _perf_max_slow_refill_waste->set_value(_max_slow_refill_waste);
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388 _perf_fast_refill_waste ->set_value(_total_fast_refill_waste);
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389 _perf_max_fast_refill_waste->set_value(_max_fast_refill_waste);
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390 _perf_slow_allocations ->set_value(_total_slow_allocations);
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391 _perf_max_slow_allocations ->set_value(_max_slow_allocations);
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392 }
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393 }
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394
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395 void GlobalTLABStats::print() {
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396 size_t waste = _total_gc_waste + _total_slow_refill_waste + _total_fast_refill_waste;
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397 double waste_percent = _total_allocation == 0 ? 0.0 :
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398 100.0 * waste / _total_allocation;
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399 gclog_or_tty->print("TLAB totals: thrds: %d refills: %d max: %d"
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400 " slow allocs: %d max %d waste: %4.1f%%"
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401 " gc: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
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402 " slow: " SIZE_FORMAT "B max: " SIZE_FORMAT "B"
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403 " fast: " SIZE_FORMAT "B max: " SIZE_FORMAT "B\n",
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404 _allocating_threads,
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duke
parents:
diff changeset
405 _total_refills, _max_refills,
a61af66fc99e Initial load
duke
parents:
diff changeset
406 _total_slow_allocations, _max_slow_allocations,
a61af66fc99e Initial load
duke
parents:
diff changeset
407 waste_percent,
a61af66fc99e Initial load
duke
parents:
diff changeset
408 _total_gc_waste * HeapWordSize,
a61af66fc99e Initial load
duke
parents:
diff changeset
409 _max_gc_waste * HeapWordSize,
a61af66fc99e Initial load
duke
parents:
diff changeset
410 _total_slow_refill_waste * HeapWordSize,
a61af66fc99e Initial load
duke
parents:
diff changeset
411 _max_slow_refill_waste * HeapWordSize,
a61af66fc99e Initial load
duke
parents:
diff changeset
412 _total_fast_refill_waste * HeapWordSize,
a61af66fc99e Initial load
duke
parents:
diff changeset
413 _max_fast_refill_waste * HeapWordSize);
a61af66fc99e Initial load
duke
parents:
diff changeset
414 }