Mercurial > hg > truffle
annotate src/share/vm/memory/sharedHeap.cpp @ 14702:d4dd5204c0aa
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author | ehelin |
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date | Fri, 14 Mar 2014 13:27:18 +0100 |
parents | 10c424c5a362 |
children | 4ca6dc0799b6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/symbolTable.hpp" | |
27 #include "classfile/systemDictionary.hpp" | |
28 #include "code/codeCache.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "memory/sharedHeap.hpp" | |
31 #include "oops/oop.inline.hpp" | |
32 #include "runtime/fprofiler.hpp" | |
33 #include "runtime/java.hpp" | |
34 #include "services/management.hpp" | |
35 #include "utilities/copy.hpp" | |
36 #include "utilities/workgroup.hpp" | |
0 | 37 |
38 SharedHeap* SharedHeap::_sh; | |
39 | |
40 // The set of potentially parallel tasks in strong root scanning. | |
41 enum SH_process_strong_roots_tasks { | |
42 SH_PS_Universe_oops_do, | |
43 SH_PS_JNIHandles_oops_do, | |
44 SH_PS_ObjectSynchronizer_oops_do, | |
45 SH_PS_FlatProfiler_oops_do, | |
46 SH_PS_Management_oops_do, | |
47 SH_PS_SystemDictionary_oops_do, | |
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48 SH_PS_ClassLoaderDataGraph_oops_do, |
0 | 49 SH_PS_jvmti_oops_do, |
50 SH_PS_CodeCache_oops_do, | |
51 // Leave this one last. | |
52 SH_PS_NumElements | |
53 }; | |
54 | |
55 SharedHeap::SharedHeap(CollectorPolicy* policy_) : | |
56 CollectedHeap(), | |
57 _collector_policy(policy_), | |
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58 _rem_set(NULL), |
0 | 59 _strong_roots_parity(0), |
60 _process_strong_tasks(new SubTasksDone(SH_PS_NumElements)), | |
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61 _workers(NULL) |
0 | 62 { |
63 if (_process_strong_tasks == NULL || !_process_strong_tasks->valid()) { | |
64 vm_exit_during_initialization("Failed necessary allocation."); | |
65 } | |
66 _sh = this; // ch is static, should be set only once. | |
67 if ((UseParNewGC || | |
11975 | 68 (UseConcMarkSweepGC && (CMSParallelInitialMarkEnabled || |
69 CMSParallelRemarkEnabled)) || | |
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70 UseG1GC) && |
0 | 71 ParallelGCThreads > 0) { |
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72 _workers = new FlexibleWorkGang("Parallel GC Threads", ParallelGCThreads, |
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73 /* are_GC_task_threads */true, |
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74 /* are_ConcurrentGC_threads */false); |
0 | 75 if (_workers == NULL) { |
76 vm_exit_during_initialization("Failed necessary allocation."); | |
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77 } else { |
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78 _workers->initialize_workers(); |
0 | 79 } |
80 } | |
81 } | |
82 | |
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83 int SharedHeap::n_termination() { |
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84 return _process_strong_tasks->n_threads(); |
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85 } |
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86 |
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87 void SharedHeap::set_n_termination(int t) { |
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88 _process_strong_tasks->set_n_threads(t); |
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89 } |
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90 |
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91 bool SharedHeap::heap_lock_held_for_gc() { |
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92 Thread* t = Thread::current(); |
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93 return Heap_lock->owned_by_self() |
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94 || ( (t->is_GC_task_thread() || t->is_VM_thread()) |
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95 && _thread_holds_heap_lock_for_gc); |
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96 } |
0 | 97 |
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98 void SharedHeap::set_par_threads(uint t) { |
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99 assert(t == 0 || !UseSerialGC, "Cannot have parallel threads"); |
0 | 100 _n_par_threads = t; |
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101 _process_strong_tasks->set_n_threads(t); |
0 | 102 } |
103 | |
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104 #ifdef ASSERT |
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105 class AssertNonScavengableClosure: public OopClosure { |
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106 public: |
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107 virtual void do_oop(oop* p) { |
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108 assert(!Universe::heap()->is_in_partial_collection(*p), |
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109 "Referent should not be scavengable."); } |
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110 virtual void do_oop(narrowOop* p) { ShouldNotReachHere(); } |
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111 }; |
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112 static AssertNonScavengableClosure assert_is_non_scavengable_closure; |
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113 #endif |
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114 |
0 | 115 void SharedHeap::change_strong_roots_parity() { |
116 // Also set the new collection parity. | |
117 assert(_strong_roots_parity >= 0 && _strong_roots_parity <= 2, | |
118 "Not in range."); | |
119 _strong_roots_parity++; | |
120 if (_strong_roots_parity == 3) _strong_roots_parity = 1; | |
121 assert(_strong_roots_parity >= 1 && _strong_roots_parity <= 2, | |
122 "Not in range."); | |
123 } | |
124 | |
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125 SharedHeap::StrongRootsScope::StrongRootsScope(SharedHeap* outer, bool activate) |
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126 : MarkScope(activate) |
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127 { |
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128 if (_active) { |
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129 outer->change_strong_roots_parity(); |
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130 // Zero the claimed high water mark in the StringTable |
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131 StringTable::clear_parallel_claimed_index(); |
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132 } |
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133 } |
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134 |
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135 SharedHeap::StrongRootsScope::~StrongRootsScope() { |
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136 // nothing particular |
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137 } |
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138 |
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139 void SharedHeap::process_strong_roots(bool activate_scope, |
0 | 140 ScanningOption so, |
141 OopClosure* roots, | |
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142 KlassClosure* klass_closure) { |
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143 StrongRootsScope srs(this, activate_scope); |
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144 |
0 | 145 // General strong roots. |
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146 assert(_strong_roots_parity != 0, "must have called prologue code"); |
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147 // _n_termination for _process_strong_tasks should be set up stream |
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148 // in a method not running in a GC worker. Otherwise the GC worker |
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149 // could be trying to change the termination condition while the task |
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150 // is executing in another GC worker. |
0 | 151 if (!_process_strong_tasks->is_task_claimed(SH_PS_Universe_oops_do)) { |
152 Universe::oops_do(roots); | |
153 } | |
154 // Global (strong) JNI handles | |
155 if (!_process_strong_tasks->is_task_claimed(SH_PS_JNIHandles_oops_do)) | |
156 JNIHandles::oops_do(roots); | |
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157 |
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158 CodeBlobToOopClosure code_roots(roots, true); |
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159 |
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160 CLDToOopClosure roots_from_clds(roots); |
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161 // If we limit class scanning to SO_SystemClasses we need to apply a CLD closure to |
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162 // CLDs which are strongly reachable from the thread stacks. |
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163 CLDToOopClosure* roots_from_clds_p = ((so & SO_SystemClasses) ? &roots_from_clds : NULL); |
0 | 164 // All threads execute this; the individual threads are task groups. |
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165 if (CollectedHeap::use_parallel_gc_threads()) { |
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166 Threads::possibly_parallel_oops_do(roots, roots_from_clds_p, &code_roots); |
0 | 167 } else { |
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168 Threads::oops_do(roots, roots_from_clds_p, &code_roots); |
0 | 169 } |
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170 |
0 | 171 if (!_process_strong_tasks-> is_task_claimed(SH_PS_ObjectSynchronizer_oops_do)) |
172 ObjectSynchronizer::oops_do(roots); | |
173 if (!_process_strong_tasks->is_task_claimed(SH_PS_FlatProfiler_oops_do)) | |
174 FlatProfiler::oops_do(roots); | |
175 if (!_process_strong_tasks->is_task_claimed(SH_PS_Management_oops_do)) | |
176 Management::oops_do(roots); | |
177 if (!_process_strong_tasks->is_task_claimed(SH_PS_jvmti_oops_do)) | |
178 JvmtiExport::oops_do(roots); | |
179 | |
180 if (!_process_strong_tasks->is_task_claimed(SH_PS_SystemDictionary_oops_do)) { | |
181 if (so & SO_AllClasses) { | |
182 SystemDictionary::oops_do(roots); | |
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183 } else if (so & SO_SystemClasses) { |
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184 SystemDictionary::always_strong_oops_do(roots); |
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185 } else { |
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186 fatal("We should always have selected either SO_AllClasses or SO_SystemClasses"); |
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187 } |
0 | 188 } |
189 | |
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190 if (!_process_strong_tasks->is_task_claimed(SH_PS_ClassLoaderDataGraph_oops_do)) { |
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191 if (so & SO_AllClasses) { |
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192 ClassLoaderDataGraph::oops_do(roots, klass_closure, /* must_claim */ false); |
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193 } else if (so & SO_SystemClasses) { |
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194 ClassLoaderDataGraph::always_strong_oops_do(roots, klass_closure, /* must_claim */ true); |
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195 } |
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196 } |
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197 |
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198 // All threads execute the following. A specific chunk of buckets |
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199 // from the StringTable are the individual tasks. |
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200 if (so & SO_Strings) { |
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201 if (CollectedHeap::use_parallel_gc_threads()) { |
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202 StringTable::possibly_parallel_oops_do(roots); |
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203 } else { |
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204 StringTable::oops_do(roots); |
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205 } |
0 | 206 } |
207 | |
208 if (!_process_strong_tasks->is_task_claimed(SH_PS_CodeCache_oops_do)) { | |
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209 if (so & SO_ScavengeCodeCache) { |
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210 assert(&code_roots != NULL, "must supply closure for code cache"); |
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211 |
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212 // We only visit parts of the CodeCache when scavenging. |
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213 CodeCache::scavenge_root_nmethods_do(&code_roots); |
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214 } |
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215 if (so & SO_AllCodeCache) { |
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216 assert(&code_roots != NULL, "must supply closure for code cache"); |
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217 |
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218 // CMSCollector uses this to do intermediate-strength collections. |
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219 // We scan the entire code cache, since CodeCache::do_unloading is not called. |
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220 CodeCache::blobs_do(&code_roots); |
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221 } |
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222 // Verify that the code cache contents are not subject to |
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223 // movement by a scavenging collection. |
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224 DEBUG_ONLY(CodeBlobToOopClosure assert_code_is_non_scavengable(&assert_is_non_scavengable_closure, /*do_marking=*/ false)); |
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225 DEBUG_ONLY(CodeCache::asserted_non_scavengable_nmethods_do(&assert_code_is_non_scavengable)); |
0 | 226 } |
227 | |
228 _process_strong_tasks->all_tasks_completed(); | |
229 } | |
230 | |
231 class AlwaysTrueClosure: public BoolObjectClosure { | |
232 public: | |
233 bool do_object_b(oop p) { return true; } | |
234 }; | |
235 static AlwaysTrueClosure always_true; | |
236 | |
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237 void SharedHeap::process_weak_roots(OopClosure* root_closure) { |
0 | 238 // Global (weak) JNI handles |
239 JNIHandles::weak_oops_do(&always_true, root_closure); | |
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240 } |
0 | 241 |
242 void SharedHeap::set_barrier_set(BarrierSet* bs) { | |
243 _barrier_set = bs; | |
244 // Cached barrier set for fast access in oops | |
245 oopDesc::set_bs(bs); | |
246 } | |
247 | |
248 void SharedHeap::post_initialize() { | |
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249 CollectedHeap::post_initialize(); |
0 | 250 ref_processing_init(); |
251 } | |
252 | |
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253 void SharedHeap::ref_processing_init() {} |
0 | 254 |
255 // Some utilities. | |
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256 void SharedHeap::print_size_transition(outputStream* out, |
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257 size_t bytes_before, |
0 | 258 size_t bytes_after, |
259 size_t capacity) { | |
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260 out->print(" %d%s->%d%s(%d%s)", |
0 | 261 byte_size_in_proper_unit(bytes_before), |
262 proper_unit_for_byte_size(bytes_before), | |
263 byte_size_in_proper_unit(bytes_after), | |
264 proper_unit_for_byte_size(bytes_after), | |
265 byte_size_in_proper_unit(capacity), | |
266 proper_unit_for_byte_size(capacity)); | |
267 } |