| File: | jdk/src/hotspot/share/memory/metaspace.cpp |
| Warning: | line 958, column 27 Value stored to 'metaspace' during its initialization is never read |
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| 1 | /* |
| 2 | * Copyright (c) 2011, 2021, Oracle and/or its affiliates. All rights reserved. |
| 3 | * Copyright (c) 2017, 2021 SAP SE. All rights reserved. |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | * |
| 6 | * This code is free software; you can redistribute it and/or modify it |
| 7 | * under the terms of the GNU General Public License version 2 only, as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 21 | * or visit www.oracle.com if you need additional information or have any |
| 22 | * questions. |
| 23 | * |
| 24 | */ |
| 25 | |
| 26 | #include "precompiled.hpp" |
| 27 | #include "cds/metaspaceShared.hpp" |
| 28 | #include "classfile/classLoaderData.hpp" |
| 29 | #include "gc/shared/collectedHeap.hpp" |
| 30 | #include "logging/log.hpp" |
| 31 | #include "logging/logStream.hpp" |
| 32 | #include "memory/classLoaderMetaspace.hpp" |
| 33 | #include "memory/metaspace.hpp" |
| 34 | #include "memory/metaspaceCriticalAllocation.hpp" |
| 35 | #include "memory/metaspace/chunkHeaderPool.hpp" |
| 36 | #include "memory/metaspace/chunkManager.hpp" |
| 37 | #include "memory/metaspace/commitLimiter.hpp" |
| 38 | #include "memory/metaspace/internalStats.hpp" |
| 39 | #include "memory/metaspace/metaspaceCommon.hpp" |
| 40 | #include "memory/metaspace/metaspaceContext.hpp" |
| 41 | #include "memory/metaspace/metaspaceReporter.hpp" |
| 42 | #include "memory/metaspace/metaspaceSettings.hpp" |
| 43 | #include "memory/metaspace/runningCounters.hpp" |
| 44 | #include "memory/metaspace/virtualSpaceList.hpp" |
| 45 | #include "memory/metaspaceTracer.hpp" |
| 46 | #include "memory/metaspaceStats.hpp" |
| 47 | #include "memory/metaspaceUtils.hpp" |
| 48 | #include "memory/resourceArea.hpp" |
| 49 | #include "memory/universe.hpp" |
| 50 | #include "oops/compressedOops.hpp" |
| 51 | #include "prims/jvmtiExport.hpp" |
| 52 | #include "runtime/atomic.hpp" |
| 53 | #include "runtime/globals_extension.hpp" |
| 54 | #include "runtime/init.hpp" |
| 55 | #include "runtime/java.hpp" |
| 56 | #include "services/memTracker.hpp" |
| 57 | #include "utilities/copy.hpp" |
| 58 | #include "utilities/debug.hpp" |
| 59 | #include "utilities/formatBuffer.hpp" |
| 60 | #include "utilities/globalDefinitions.hpp" |
| 61 | |
| 62 | using metaspace::ChunkManager; |
| 63 | using metaspace::CommitLimiter; |
| 64 | using metaspace::MetaspaceContext; |
| 65 | using metaspace::MetaspaceReporter; |
| 66 | using metaspace::RunningCounters; |
| 67 | using metaspace::VirtualSpaceList; |
| 68 | |
| 69 | size_t MetaspaceUtils::used_words() { |
| 70 | return RunningCounters::used_words(); |
| 71 | } |
| 72 | |
| 73 | size_t MetaspaceUtils::used_words(Metaspace::MetadataType mdtype) { |
| 74 | return mdtype == Metaspace::ClassType ? RunningCounters::used_words_class() : RunningCounters::used_words_nonclass(); |
| 75 | } |
| 76 | |
| 77 | size_t MetaspaceUtils::reserved_words() { |
| 78 | return RunningCounters::reserved_words(); |
| 79 | } |
| 80 | |
| 81 | size_t MetaspaceUtils::reserved_words(Metaspace::MetadataType mdtype) { |
| 82 | return mdtype == Metaspace::ClassType ? RunningCounters::reserved_words_class() : RunningCounters::reserved_words_nonclass(); |
| 83 | } |
| 84 | |
| 85 | size_t MetaspaceUtils::committed_words() { |
| 86 | return RunningCounters::committed_words(); |
| 87 | } |
| 88 | |
| 89 | size_t MetaspaceUtils::committed_words(Metaspace::MetadataType mdtype) { |
| 90 | return mdtype == Metaspace::ClassType ? RunningCounters::committed_words_class() : RunningCounters::committed_words_nonclass(); |
| 91 | } |
| 92 | |
| 93 | // Helper for get_statistics() |
| 94 | static void get_values_for(Metaspace::MetadataType mdtype, size_t* reserved, size_t* committed, size_t* used) { |
| 95 | #define w2b(x) (x * sizeof(MetaWord)) |
| 96 | if (mdtype == Metaspace::ClassType) { |
| 97 | *reserved = w2b(RunningCounters::reserved_words_class()); |
| 98 | *committed = w2b(RunningCounters::committed_words_class()); |
| 99 | *used = w2b(RunningCounters::used_words_class()); |
| 100 | } else { |
| 101 | *reserved = w2b(RunningCounters::reserved_words_nonclass()); |
| 102 | *committed = w2b(RunningCounters::committed_words_nonclass()); |
| 103 | *used = w2b(RunningCounters::used_words_nonclass()); |
| 104 | } |
| 105 | #undef w2b |
| 106 | } |
| 107 | |
| 108 | // Retrieve all statistics in one go; make sure the values are consistent. |
| 109 | MetaspaceStats MetaspaceUtils::get_statistics(Metaspace::MetadataType mdtype) { |
| 110 | |
| 111 | // Consistency: |
| 112 | // This function reads three values (reserved, committed, used) from different counters. These counters |
| 113 | // may (very rarely) be out of sync. This has been a source for intermittent test errors in the past |
| 114 | // (see e.g. JDK-8237872, JDK-8151460). |
| 115 | // - reserved and committed counter are updated under protection of Metaspace_lock; an inconsistency |
| 116 | // between them can be the result of a dirty read. |
| 117 | // - used is an atomic counter updated outside any lock range; there is no way to guarantee |
| 118 | // a clean read wrt the other two values. |
| 119 | // Reading these values under lock protection would would only help for the first case. Therefore |
| 120 | // we don't bother and just re-read several times, then give up and correct the values. |
| 121 | |
| 122 | size_t r = 0, c = 0, u = 0; // Note: byte values. |
| 123 | get_values_for(mdtype, &r, &c, &u); |
| 124 | int retries = 10; |
| 125 | // If the first retrieval resulted in inconsistent values, retry a bit... |
| 126 | while ((r < c || c < u) && --retries >= 0) { |
| 127 | get_values_for(mdtype, &r, &c, &u); |
| 128 | } |
| 129 | if (c < u || r < c) { // still inconsistent. |
| 130 | // ... but not endlessly. If we don't get consistent values, correct them on the fly. |
| 131 | // The logic here is that we trust the used counter - its an atomic counter and whatever we see |
| 132 | // must have been the truth once - and from that we reconstruct a likely set of committed/reserved |
| 133 | // values. |
| 134 | metaspace::InternalStats::inc_num_inconsistent_stats(); |
| 135 | if (c < u) { |
| 136 | c = align_up(u, Metaspace::commit_alignment()); |
| 137 | } |
| 138 | if (r < c) { |
| 139 | r = align_up(c, Metaspace::reserve_alignment()); |
| 140 | } |
| 141 | } |
| 142 | return MetaspaceStats(r, c, u); |
| 143 | } |
| 144 | |
| 145 | MetaspaceCombinedStats MetaspaceUtils::get_combined_statistics() { |
| 146 | return MetaspaceCombinedStats(get_statistics(Metaspace::ClassType), get_statistics(Metaspace::NonClassType)); |
| 147 | } |
| 148 | |
| 149 | void MetaspaceUtils::print_metaspace_change(const MetaspaceCombinedStats& pre_meta_values) { |
| 150 | // Get values now: |
| 151 | const MetaspaceCombinedStats meta_values = get_combined_statistics(); |
| 152 | |
| 153 | // We print used and committed since these are the most useful at-a-glance vitals for Metaspace: |
| 154 | // - used tells you how much memory is actually used for metadata |
| 155 | // - committed tells you how much memory is committed for the purpose of metadata |
| 156 | // The difference between those two would be waste, which can have various forms (freelists, |
| 157 | // unused parts of committed chunks etc) |
| 158 | // |
| 159 | // Left out is reserved, since this is not as exciting as the first two values: for class space, |
| 160 | // it is a constant (to uninformed users, often confusingly large). For non-class space, it would |
| 161 | // be interesting since free chunks can be uncommitted, but for now it is left out. |
| 162 | |
| 163 | if (Metaspace::using_class_space()) { |
| 164 | log_info(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Info))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Info>(HEAP_CHANGE_FORMAT"%s: " "%" "l" "u" "K(" "%" "l" "u" "K)->" "%" "l" "u" "K(" "%" "l" "u" "K)"" " |
| 165 | HEAP_CHANGE_FORMAT"%s: " "%" "l" "u" "K(" "%" "l" "u" "K)->" "%" "l" "u" "K(" "%" "l" "u" "K)"" " |
| 166 | HEAP_CHANGE_FORMAT"%s: " "%" "l" "u" "K(" "%" "l" "u" "K)->" "%" "l" "u" "K(" "%" "l" "u" "K)", |
| 167 | HEAP_CHANGE_FORMAT_ARGS("Metaspace",("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K |
| 168 | pre_meta_values.used(),("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K |
| 169 | pre_meta_values.committed(),("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K |
| 170 | meta_values.used(),("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K |
| 171 | meta_values.committed())("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K, |
| 172 | HEAP_CHANGE_FORMAT_ARGS("NonClass",("NonClass"), (pre_meta_values.non_class_used()) / K, (pre_meta_values .non_class_committed()) / K, (meta_values.non_class_used()) / K, (meta_values.non_class_committed()) / K |
| 173 | pre_meta_values.non_class_used(),("NonClass"), (pre_meta_values.non_class_used()) / K, (pre_meta_values .non_class_committed()) / K, (meta_values.non_class_used()) / K, (meta_values.non_class_committed()) / K |
| 174 | pre_meta_values.non_class_committed(),("NonClass"), (pre_meta_values.non_class_used()) / K, (pre_meta_values .non_class_committed()) / K, (meta_values.non_class_used()) / K, (meta_values.non_class_committed()) / K |
| 175 | meta_values.non_class_used(),("NonClass"), (pre_meta_values.non_class_used()) / K, (pre_meta_values .non_class_committed()) / K, (meta_values.non_class_used()) / K, (meta_values.non_class_committed()) / K |
| 176 | meta_values.non_class_committed())("NonClass"), (pre_meta_values.non_class_used()) / K, (pre_meta_values .non_class_committed()) / K, (meta_values.non_class_used()) / K, (meta_values.non_class_committed()) / K, |
| 177 | HEAP_CHANGE_FORMAT_ARGS("Class",("Class"), (pre_meta_values.class_used()) / K, (pre_meta_values .class_committed()) / K, (meta_values.class_used()) / K, (meta_values .class_committed()) / K |
| 178 | pre_meta_values.class_used(),("Class"), (pre_meta_values.class_used()) / K, (pre_meta_values .class_committed()) / K, (meta_values.class_used()) / K, (meta_values .class_committed()) / K |
| 179 | pre_meta_values.class_committed(),("Class"), (pre_meta_values.class_used()) / K, (pre_meta_values .class_committed()) / K, (meta_values.class_used()) / K, (meta_values .class_committed()) / K |
| 180 | meta_values.class_used(),("Class"), (pre_meta_values.class_used()) / K, (pre_meta_values .class_committed()) / K, (meta_values.class_used()) / K, (meta_values .class_committed()) / K |
| 181 | meta_values.class_committed())("Class"), (pre_meta_values.class_used()) / K, (pre_meta_values .class_committed()) / K, (meta_values.class_used()) / K, (meta_values .class_committed()) / K); |
| 182 | } else { |
| 183 | log_info(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Info))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Info>(HEAP_CHANGE_FORMAT"%s: " "%" "l" "u" "K(" "%" "l" "u" "K)->" "%" "l" "u" "K(" "%" "l" "u" "K)", |
| 184 | HEAP_CHANGE_FORMAT_ARGS("Metaspace",("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K |
| 185 | pre_meta_values.used(),("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K |
| 186 | pre_meta_values.committed(),("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K |
| 187 | meta_values.used(),("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K |
| 188 | meta_values.committed())("Metaspace"), (pre_meta_values.used()) / K, (pre_meta_values .committed()) / K, (meta_values.used()) / K, (meta_values.committed ()) / K); |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | // This will print out a basic metaspace usage report but |
| 193 | // unlike print_report() is guaranteed not to lock or to walk the CLDG. |
| 194 | void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) { |
| 195 | MetaspaceReporter::print_basic_report(out, scale); |
| 196 | } |
| 197 | |
| 198 | // Prints a report about the current metaspace state. |
| 199 | // Optional parts can be enabled via flags. |
| 200 | // Function will walk the CLDG and will lock the expand lock; if that is not |
| 201 | // convenient, use print_basic_report() instead. |
| 202 | void MetaspaceUtils::print_report(outputStream* out, size_t scale) { |
| 203 | const int flags = |
| 204 | (int)MetaspaceReporter::Option::ShowLoaders | |
| 205 | (int)MetaspaceReporter::Option::BreakDownByChunkType | |
| 206 | (int)MetaspaceReporter::Option::ShowClasses; |
| 207 | MetaspaceReporter::print_report(out, scale, flags); |
| 208 | } |
| 209 | |
| 210 | void MetaspaceUtils::print_on(outputStream* out) { |
| 211 | |
| 212 | // Used from all GCs. It first prints out totals, then, separately, the class space portion. |
| 213 | MetaspaceCombinedStats stats = get_combined_statistics(); |
| 214 | out->print_cr(" Metaspace " |
| 215 | "used " SIZE_FORMAT"%" "l" "u" "K, " |
| 216 | "committed " SIZE_FORMAT"%" "l" "u" "K, " |
| 217 | "reserved " SIZE_FORMAT"%" "l" "u" "K", |
| 218 | stats.used()/K, |
| 219 | stats.committed()/K, |
| 220 | stats.reserved()/K); |
| 221 | |
| 222 | if (Metaspace::using_class_space()) { |
| 223 | out->print_cr(" class space " |
| 224 | "used " SIZE_FORMAT"%" "l" "u" "K, " |
| 225 | "committed " SIZE_FORMAT"%" "l" "u" "K, " |
| 226 | "reserved " SIZE_FORMAT"%" "l" "u" "K", |
| 227 | stats.class_space_stats().used()/K, |
| 228 | stats.class_space_stats().committed()/K, |
| 229 | stats.class_space_stats().reserved()/K); |
| 230 | } |
| 231 | } |
| 232 | |
| 233 | #ifdef ASSERT1 |
| 234 | void MetaspaceUtils::verify() { |
| 235 | if (Metaspace::initialized()) { |
| 236 | |
| 237 | // Verify non-class chunkmanager... |
| 238 | ChunkManager* cm = ChunkManager::chunkmanager_nonclass(); |
| 239 | cm->verify(); |
| 240 | |
| 241 | // ... and space list. |
| 242 | VirtualSpaceList* vsl = VirtualSpaceList::vslist_nonclass(); |
| 243 | vsl->verify(); |
| 244 | |
| 245 | if (Metaspace::using_class_space()) { |
| 246 | // If we use compressed class pointers, verify class chunkmanager... |
| 247 | cm = ChunkManager::chunkmanager_class(); |
| 248 | cm->verify(); |
| 249 | |
| 250 | // ... and class spacelist. |
| 251 | vsl = VirtualSpaceList::vslist_class(); |
| 252 | vsl->verify(); |
| 253 | } |
| 254 | |
| 255 | } |
| 256 | } |
| 257 | #endif |
| 258 | |
| 259 | ////////////////////////////////7 |
| 260 | // MetaspaceGC methods |
| 261 | |
| 262 | volatile size_t MetaspaceGC::_capacity_until_GC = 0; |
| 263 | uint MetaspaceGC::_shrink_factor = 0; |
| 264 | |
| 265 | // VM_CollectForMetadataAllocation is the vm operation used to GC. |
| 266 | // Within the VM operation after the GC the attempt to allocate the metadata |
| 267 | // should succeed. If the GC did not free enough space for the metaspace |
| 268 | // allocation, the HWM is increased so that another virtualspace will be |
| 269 | // allocated for the metadata. With perm gen the increase in the perm |
| 270 | // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
| 271 | // metaspace policy uses those as the small and large steps for the HWM. |
| 272 | // |
| 273 | // After the GC the compute_new_size() for MetaspaceGC is called to |
| 274 | // resize the capacity of the metaspaces. The current implementation |
| 275 | // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used |
| 276 | // to resize the Java heap by some GC's. New flags can be implemented |
| 277 | // if really needed. MinMetaspaceFreeRatio is used to calculate how much |
| 278 | // free space is desirable in the metaspace capacity to decide how much |
| 279 | // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much |
| 280 | // free space is desirable in the metaspace capacity before decreasing |
| 281 | // the HWM. |
| 282 | |
| 283 | // Calculate the amount to increase the high water mark (HWM). |
| 284 | // Increase by a minimum amount (MinMetaspaceExpansion) so that |
| 285 | // another expansion is not requested too soon. If that is not |
| 286 | // enough to satisfy the allocation, increase by MaxMetaspaceExpansion. |
| 287 | // If that is still not enough, expand by the size of the allocation |
| 288 | // plus some. |
| 289 | size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) { |
| 290 | size_t min_delta = MinMetaspaceExpansion; |
| 291 | size_t max_delta = MaxMetaspaceExpansion; |
| 292 | size_t delta = align_up(bytes, Metaspace::commit_alignment()); |
| 293 | |
| 294 | if (delta <= min_delta) { |
| 295 | delta = min_delta; |
| 296 | } else if (delta <= max_delta) { |
| 297 | // Don't want to hit the high water mark on the next |
| 298 | // allocation so make the delta greater than just enough |
| 299 | // for this allocation. |
| 300 | delta = max_delta; |
| 301 | } else { |
| 302 | // This allocation is large but the next ones are probably not |
| 303 | // so increase by the minimum. |
| 304 | delta = delta + min_delta; |
| 305 | } |
| 306 | |
| 307 | assert_is_aligned(delta, Metaspace::commit_alignment())do { if (!(is_aligned((delta), (Metaspace::commit_alignment() )))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 307, "assert(" "is_aligned((delta), (Metaspace::commit_alignment()))" ") failed", "0x%" "l" "x" " is not aligned to " "0x%" "l" "x" , (size_t)(uintptr_t)delta, (size_t)(Metaspace::commit_alignment ())); ::breakpoint(); } } while (0); |
| 308 | |
| 309 | return delta; |
| 310 | } |
| 311 | |
| 312 | size_t MetaspaceGC::capacity_until_GC() { |
| 313 | size_t value = Atomic::load_acquire(&_capacity_until_GC); |
| 314 | assert(value >= MetaspaceSize, "Not initialized properly?")do { if (!(value >= MetaspaceSize)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 314, "assert(" "value >= MetaspaceSize" ") failed", "Not initialized properly?" ); ::breakpoint(); } } while (0); |
| 315 | return value; |
| 316 | } |
| 317 | |
| 318 | // Try to increase the _capacity_until_GC limit counter by v bytes. |
| 319 | // Returns true if it succeeded. It may fail if either another thread |
| 320 | // concurrently increased the limit or the new limit would be larger |
| 321 | // than MaxMetaspaceSize. |
| 322 | // On success, optionally returns new and old metaspace capacity in |
| 323 | // new_cap_until_GC and old_cap_until_GC respectively. |
| 324 | // On error, optionally sets can_retry to indicate whether if there is |
| 325 | // actually enough space remaining to satisfy the request. |
| 326 | bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC, bool* can_retry) { |
| 327 | assert_is_aligned(v, Metaspace::commit_alignment())do { if (!(is_aligned((v), (Metaspace::commit_alignment())))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 327, "assert(" "is_aligned((v), (Metaspace::commit_alignment()))" ") failed", "0x%" "l" "x" " is not aligned to " "0x%" "l" "x" , (size_t)(uintptr_t)v, (size_t)(Metaspace::commit_alignment( ))); ::breakpoint(); } } while (0); |
| 328 | |
| 329 | size_t old_capacity_until_GC = _capacity_until_GC; |
| 330 | size_t new_value = old_capacity_until_GC + v; |
| 331 | |
| 332 | if (new_value < old_capacity_until_GC) { |
| 333 | // The addition wrapped around, set new_value to aligned max value. |
| 334 | new_value = align_down(max_uintx, Metaspace::reserve_alignment()); |
| 335 | } |
| 336 | |
| 337 | if (new_value > MaxMetaspaceSize) { |
| 338 | if (can_retry != NULL__null) { |
| 339 | *can_retry = false; |
| 340 | } |
| 341 | return false; |
| 342 | } |
| 343 | |
| 344 | if (can_retry != NULL__null) { |
| 345 | *can_retry = true; |
| 346 | } |
| 347 | size_t prev_value = Atomic::cmpxchg(&_capacity_until_GC, old_capacity_until_GC, new_value); |
| 348 | |
| 349 | if (old_capacity_until_GC != prev_value) { |
| 350 | return false; |
| 351 | } |
| 352 | |
| 353 | if (new_cap_until_GC != NULL__null) { |
| 354 | *new_cap_until_GC = new_value; |
| 355 | } |
| 356 | if (old_cap_until_GC != NULL__null) { |
| 357 | *old_cap_until_GC = old_capacity_until_GC; |
| 358 | } |
| 359 | return true; |
| 360 | } |
| 361 | |
| 362 | size_t MetaspaceGC::dec_capacity_until_GC(size_t v) { |
| 363 | assert_is_aligned(v, Metaspace::commit_alignment())do { if (!(is_aligned((v), (Metaspace::commit_alignment())))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 363, "assert(" "is_aligned((v), (Metaspace::commit_alignment()))" ") failed", "0x%" "l" "x" " is not aligned to " "0x%" "l" "x" , (size_t)(uintptr_t)v, (size_t)(Metaspace::commit_alignment( ))); ::breakpoint(); } } while (0); |
| 364 | |
| 365 | return Atomic::sub(&_capacity_until_GC, v); |
| 366 | } |
| 367 | |
| 368 | void MetaspaceGC::initialize() { |
| 369 | // Set the high-water mark to MaxMetapaceSize during VM initializaton since |
| 370 | // we can't do a GC during initialization. |
| 371 | _capacity_until_GC = MaxMetaspaceSize; |
| 372 | } |
| 373 | |
| 374 | void MetaspaceGC::post_initialize() { |
| 375 | // Reset the high-water mark once the VM initialization is done. |
| 376 | _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize); |
| 377 | } |
| 378 | |
| 379 | bool MetaspaceGC::can_expand(size_t word_size, bool is_class) { |
| 380 | // Check if the compressed class space is full. |
| 381 | if (is_class && Metaspace::using_class_space()) { |
| 382 | size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType); |
| 383 | if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) { |
| 384 | log_trace(gc, metaspace, freelist)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::_freelist ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::_freelist), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>("Cannot expand %s metaspace by " SIZE_FORMAT"%" "l" "u" " words (CompressedClassSpaceSize = " SIZE_FORMAT"%" "l" "u" " words)", |
| 385 | (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord)); |
| 386 | return false; |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | // Check if the user has imposed a limit on the metaspace memory. |
| 391 | size_t committed_bytes = MetaspaceUtils::committed_bytes(); |
| 392 | if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) { |
| 393 | log_trace(gc, metaspace, freelist)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::_freelist ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::_freelist), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>("Cannot expand %s metaspace by " SIZE_FORMAT"%" "l" "u" " words (MaxMetaspaceSize = " SIZE_FORMAT"%" "l" "u" " words)", |
| 394 | (is_class ? "class" : "non-class"), word_size, MaxMetaspaceSize / sizeof(MetaWord)); |
| 395 | return false; |
| 396 | } |
| 397 | |
| 398 | return true; |
| 399 | } |
| 400 | |
| 401 | size_t MetaspaceGC::allowed_expansion() { |
| 402 | size_t committed_bytes = MetaspaceUtils::committed_bytes(); |
| 403 | size_t capacity_until_gc = capacity_until_GC(); |
| 404 | |
| 405 | assert(capacity_until_gc >= committed_bytes,do { if (!(capacity_until_gc >= committed_bytes)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 407, "assert(" "capacity_until_gc >= committed_bytes" ") failed" , "capacity_until_gc: " "%" "l" "u" " < committed_bytes: " "%" "l" "u", capacity_until_gc, committed_bytes); ::breakpoint (); } } while (0) |
| 406 | "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT,do { if (!(capacity_until_gc >= committed_bytes)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 407, "assert(" "capacity_until_gc >= committed_bytes" ") failed" , "capacity_until_gc: " "%" "l" "u" " < committed_bytes: " "%" "l" "u", capacity_until_gc, committed_bytes); ::breakpoint (); } } while (0) |
| 407 | capacity_until_gc, committed_bytes)do { if (!(capacity_until_gc >= committed_bytes)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 407, "assert(" "capacity_until_gc >= committed_bytes" ") failed" , "capacity_until_gc: " "%" "l" "u" " < committed_bytes: " "%" "l" "u", capacity_until_gc, committed_bytes); ::breakpoint (); } } while (0); |
| 408 | |
| 409 | size_t left_until_max = MaxMetaspaceSize - committed_bytes; |
| 410 | size_t left_until_GC = capacity_until_gc - committed_bytes; |
| 411 | size_t left_to_commit = MIN2(left_until_GC, left_until_max); |
| 412 | log_trace(gc, metaspace, freelist)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::_freelist ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::_freelist), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>("allowed expansion words: " SIZE_FORMAT"%" "l" "u" |
| 413 | " (left_until_max: " SIZE_FORMAT"%" "l" "u" ", left_until_GC: " SIZE_FORMAT"%" "l" "u" ".", |
| 414 | left_to_commit / BytesPerWord, left_until_max / BytesPerWord, left_until_GC / BytesPerWord); |
| 415 | |
| 416 | return left_to_commit / BytesPerWord; |
| 417 | } |
| 418 | |
| 419 | void MetaspaceGC::compute_new_size() { |
| 420 | assert(_shrink_factor <= 100, "invalid shrink factor")do { if (!(_shrink_factor <= 100)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 420, "assert(" "_shrink_factor <= 100" ") failed", "invalid shrink factor" ); ::breakpoint(); } } while (0); |
| 421 | uint current_shrink_factor = _shrink_factor; |
| 422 | _shrink_factor = 0; |
| 423 | |
| 424 | // Using committed_bytes() for used_after_gc is an overestimation, since the |
| 425 | // chunk free lists are included in committed_bytes() and the memory in an |
| 426 | // un-fragmented chunk free list is available for future allocations. |
| 427 | // However, if the chunk free lists becomes fragmented, then the memory may |
| 428 | // not be available for future allocations and the memory is therefore "in use". |
| 429 | // Including the chunk free lists in the definition of "in use" is therefore |
| 430 | // necessary. Not including the chunk free lists can cause capacity_until_GC to |
| 431 | // shrink below committed_bytes() and this has caused serious bugs in the past. |
| 432 | const size_t used_after_gc = MetaspaceUtils::committed_bytes(); |
| 433 | const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC(); |
| 434 | |
| 435 | const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0; |
| 436 | const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
| 437 | |
| 438 | const double min_tmp = used_after_gc / maximum_used_percentage; |
| 439 | size_t minimum_desired_capacity = |
| 440 | (size_t)MIN2(min_tmp, double(MaxMetaspaceSize)); |
| 441 | // Don't shrink less than the initial generation size |
| 442 | minimum_desired_capacity = MAX2(minimum_desired_capacity, |
| 443 | MetaspaceSize); |
| 444 | |
| 445 | log_trace(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>("MetaspaceGC::compute_new_size: "); |
| 446 | log_trace(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>(" minimum_free_percentage: %6.2f maximum_used_percentage: %6.2f", |
| 447 | minimum_free_percentage, maximum_used_percentage); |
| 448 | log_trace(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>(" used_after_gc : %6.1fKB", used_after_gc / (double) K); |
| 449 | |
| 450 | size_t shrink_bytes = 0; |
| 451 | if (capacity_until_GC < minimum_desired_capacity) { |
| 452 | // If we have less capacity below the metaspace HWM, then |
| 453 | // increment the HWM. |
| 454 | size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
| 455 | expand_bytes = align_up(expand_bytes, Metaspace::commit_alignment()); |
| 456 | // Don't expand unless it's significant |
| 457 | if (expand_bytes >= MinMetaspaceExpansion) { |
| 458 | size_t new_capacity_until_GC = 0; |
| 459 | bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC); |
| 460 | assert(succeeded, "Should always succesfully increment HWM when at safepoint")do { if (!(succeeded)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 460, "assert(" "succeeded" ") failed", "Should always succesfully increment HWM when at safepoint" ); ::breakpoint(); } } while (0); |
| 461 | |
| 462 | Metaspace::tracer()->report_gc_threshold(capacity_until_GC, |
| 463 | new_capacity_until_GC, |
| 464 | MetaspaceGCThresholdUpdater::ComputeNewSize); |
| 465 | log_trace(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>(" expanding: minimum_desired_capacity: %6.1fKB expand_bytes: %6.1fKB MinMetaspaceExpansion: %6.1fKB new metaspace HWM: %6.1fKB", |
| 466 | minimum_desired_capacity / (double) K, |
| 467 | expand_bytes / (double) K, |
| 468 | MinMetaspaceExpansion / (double) K, |
| 469 | new_capacity_until_GC / (double) K); |
| 470 | } |
| 471 | return; |
| 472 | } |
| 473 | |
| 474 | // No expansion, now see if we want to shrink |
| 475 | // We would never want to shrink more than this |
| 476 | assert(capacity_until_GC >= minimum_desired_capacity,do { if (!(capacity_until_GC >= minimum_desired_capacity)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 478, "assert(" "capacity_until_GC >= minimum_desired_capacity" ") failed", "%" "l" "u" " >= " "%" "l" "u", capacity_until_GC , minimum_desired_capacity); ::breakpoint(); } } while (0) |
| 477 | SIZE_FORMAT " >= " SIZE_FORMAT,do { if (!(capacity_until_GC >= minimum_desired_capacity)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 478, "assert(" "capacity_until_GC >= minimum_desired_capacity" ") failed", "%" "l" "u" " >= " "%" "l" "u", capacity_until_GC , minimum_desired_capacity); ::breakpoint(); } } while (0) |
| 478 | capacity_until_GC, minimum_desired_capacity)do { if (!(capacity_until_GC >= minimum_desired_capacity)) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 478, "assert(" "capacity_until_GC >= minimum_desired_capacity" ") failed", "%" "l" "u" " >= " "%" "l" "u", capacity_until_GC , minimum_desired_capacity); ::breakpoint(); } } while (0); |
| 479 | size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity; |
| 480 | |
| 481 | // Should shrinking be considered? |
| 482 | if (MaxMetaspaceFreeRatio < 100) { |
| 483 | const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0; |
| 484 | const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| 485 | const double max_tmp = used_after_gc / minimum_used_percentage; |
| 486 | size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(MaxMetaspaceSize)); |
| 487 | maximum_desired_capacity = MAX2(maximum_desired_capacity, |
| 488 | MetaspaceSize); |
| 489 | log_trace(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>(" maximum_free_percentage: %6.2f minimum_used_percentage: %6.2f", |
| 490 | maximum_free_percentage, minimum_used_percentage); |
| 491 | log_trace(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>(" minimum_desired_capacity: %6.1fKB maximum_desired_capacity: %6.1fKB", |
| 492 | minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K); |
| 493 | |
| 494 | assert(minimum_desired_capacity <= maximum_desired_capacity,do { if (!(minimum_desired_capacity <= maximum_desired_capacity )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 495, "assert(" "minimum_desired_capacity <= maximum_desired_capacity" ") failed", "sanity check"); ::breakpoint(); } } while (0) |
| 495 | "sanity check")do { if (!(minimum_desired_capacity <= maximum_desired_capacity )) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 495, "assert(" "minimum_desired_capacity <= maximum_desired_capacity" ") failed", "sanity check"); ::breakpoint(); } } while (0); |
| 496 | |
| 497 | if (capacity_until_GC > maximum_desired_capacity) { |
| 498 | // Capacity too large, compute shrinking size |
| 499 | shrink_bytes = capacity_until_GC - maximum_desired_capacity; |
| 500 | // We don't want shrink all the way back to initSize if people call |
| 501 | // System.gc(), because some programs do that between "phases" and then |
| 502 | // we'd just have to grow the heap up again for the next phase. So we |
| 503 | // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
| 504 | // on the third call, and 100% by the fourth call. But if we recompute |
| 505 | // size without shrinking, it goes back to 0%. |
| 506 | shrink_bytes = shrink_bytes / 100 * current_shrink_factor; |
| 507 | |
| 508 | shrink_bytes = align_down(shrink_bytes, Metaspace::commit_alignment()); |
| 509 | |
| 510 | assert(shrink_bytes <= max_shrink_bytes,do { if (!(shrink_bytes <= max_shrink_bytes)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 512, "assert(" "shrink_bytes <= max_shrink_bytes" ") failed" , "invalid shrink size " "%" "l" "u" " not <= " "%" "l" "u" , shrink_bytes, max_shrink_bytes); ::breakpoint(); } } while ( 0) |
| 511 | "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT,do { if (!(shrink_bytes <= max_shrink_bytes)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 512, "assert(" "shrink_bytes <= max_shrink_bytes" ") failed" , "invalid shrink size " "%" "l" "u" " not <= " "%" "l" "u" , shrink_bytes, max_shrink_bytes); ::breakpoint(); } } while ( 0) |
| 512 | shrink_bytes, max_shrink_bytes)do { if (!(shrink_bytes <= max_shrink_bytes)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 512, "assert(" "shrink_bytes <= max_shrink_bytes" ") failed" , "invalid shrink size " "%" "l" "u" " not <= " "%" "l" "u" , shrink_bytes, max_shrink_bytes); ::breakpoint(); } } while ( 0); |
| 513 | if (current_shrink_factor == 0) { |
| 514 | _shrink_factor = 10; |
| 515 | } else { |
| 516 | _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
| 517 | } |
| 518 | log_trace(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>(" shrinking: initThreshold: %.1fK maximum_desired_capacity: %.1fK", |
| 519 | MetaspaceSize / (double) K, maximum_desired_capacity / (double) K); |
| 520 | log_trace(gc, metaspace)(!(LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::is_level(LogLevel::Trace))) ? (void)0 : LogImpl<(LogTag ::_gc), (LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG)>::write<LogLevel ::Trace>(" shrink_bytes: %.1fK current_shrink_factor: %d new shrink factor: %d MinMetaspaceExpansion: %.1fK", |
| 521 | shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K); |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | // Don't shrink unless it's significant |
| 526 | if (shrink_bytes >= MinMetaspaceExpansion && |
| 527 | ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) { |
| 528 | size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes); |
| 529 | Metaspace::tracer()->report_gc_threshold(capacity_until_GC, |
| 530 | new_capacity_until_GC, |
| 531 | MetaspaceGCThresholdUpdater::ComputeNewSize); |
| 532 | } |
| 533 | } |
| 534 | |
| 535 | ////// Metaspace methods ///// |
| 536 | |
| 537 | const MetaspaceTracer* Metaspace::_tracer = NULL__null; |
| 538 | |
| 539 | bool Metaspace::initialized() { |
| 540 | return metaspace::MetaspaceContext::context_nonclass() != NULL__null |
| 541 | LP64_ONLY(&& (using_class_space() ? Metaspace::class_space_is_initialized() : true))&& (using_class_space() ? Metaspace::class_space_is_initialized () : true); |
| 542 | } |
| 543 | |
| 544 | #ifdef _LP641 |
| 545 | |
| 546 | void Metaspace::print_compressed_class_space(outputStream* st) { |
| 547 | if (VirtualSpaceList::vslist_class() != NULL__null) { |
| 548 | MetaWord* base = VirtualSpaceList::vslist_class()->base_of_first_node(); |
| 549 | size_t size = VirtualSpaceList::vslist_class()->word_size_of_first_node(); |
| 550 | MetaWord* top = base + size; |
| 551 | st->print("Compressed class space mapped at: " PTR_FORMAT"0x%016" "l" "x" "-" PTR_FORMAT"0x%016" "l" "x" ", reserved size: " SIZE_FORMAT"%" "l" "u", |
| 552 | p2i(base), p2i(top), (top - base) * BytesPerWord); |
| 553 | st->cr(); |
| 554 | } |
| 555 | } |
| 556 | |
| 557 | // Given a prereserved space, use that to set up the compressed class space list. |
| 558 | void Metaspace::initialize_class_space(ReservedSpace rs) { |
| 559 | assert(rs.size() >= CompressedClassSpaceSize,do { if (!(rs.size() >= CompressedClassSpaceSize)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 560, "assert(" "rs.size() >= CompressedClassSpaceSize" ") failed" , "%" "l" "u" " != " "%" "l" "u", rs.size(), CompressedClassSpaceSize ); ::breakpoint(); } } while (0) |
| 560 | SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize)do { if (!(rs.size() >= CompressedClassSpaceSize)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 560, "assert(" "rs.size() >= CompressedClassSpaceSize" ") failed" , "%" "l" "u" " != " "%" "l" "u", rs.size(), CompressedClassSpaceSize ); ::breakpoint(); } } while (0); |
| 561 | assert(using_class_space(), "Must be using class space")do { if (!(using_class_space())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 561, "assert(" "using_class_space()" ") failed", "Must be using class space" ); ::breakpoint(); } } while (0); |
| 562 | |
| 563 | assert(rs.size() == CompressedClassSpaceSize, SIZE_FORMAT " != " SIZE_FORMAT,do { if (!(rs.size() == CompressedClassSpaceSize)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 564, "assert(" "rs.size() == CompressedClassSpaceSize" ") failed" , "%" "l" "u" " != " "%" "l" "u", rs.size(), CompressedClassSpaceSize ); ::breakpoint(); } } while (0) |
| 564 | rs.size(), CompressedClassSpaceSize)do { if (!(rs.size() == CompressedClassSpaceSize)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 564, "assert(" "rs.size() == CompressedClassSpaceSize" ") failed" , "%" "l" "u" " != " "%" "l" "u", rs.size(), CompressedClassSpaceSize ); ::breakpoint(); } } while (0); |
| 565 | assert(is_aligned(rs.base(), Metaspace::reserve_alignment()) &&do { if (!(is_aligned(rs.base(), Metaspace::reserve_alignment ()) && is_aligned(rs.size(), Metaspace::reserve_alignment ()))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 567, "assert(" "is_aligned(rs.base(), Metaspace::reserve_alignment()) && is_aligned(rs.size(), Metaspace::reserve_alignment())" ") failed", "wrong alignment"); ::breakpoint(); } } while (0 ) |
| 566 | is_aligned(rs.size(), Metaspace::reserve_alignment()),do { if (!(is_aligned(rs.base(), Metaspace::reserve_alignment ()) && is_aligned(rs.size(), Metaspace::reserve_alignment ()))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 567, "assert(" "is_aligned(rs.base(), Metaspace::reserve_alignment()) && is_aligned(rs.size(), Metaspace::reserve_alignment())" ") failed", "wrong alignment"); ::breakpoint(); } } while (0 ) |
| 567 | "wrong alignment")do { if (!(is_aligned(rs.base(), Metaspace::reserve_alignment ()) && is_aligned(rs.size(), Metaspace::reserve_alignment ()))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 567, "assert(" "is_aligned(rs.base(), Metaspace::reserve_alignment()) && is_aligned(rs.size(), Metaspace::reserve_alignment())" ") failed", "wrong alignment"); ::breakpoint(); } } while (0 ); |
| 568 | |
| 569 | MetaspaceContext::initialize_class_space_context(rs); |
| 570 | |
| 571 | // This does currently not work because rs may be the result of a split |
| 572 | // operation and NMT seems not to be able to handle splits. |
| 573 | // Will be fixed with JDK-8243535. |
| 574 | // MemTracker::record_virtual_memory_type((address)rs.base(), mtClass); |
| 575 | |
| 576 | } |
| 577 | |
| 578 | // Returns true if class space has been setup (initialize_class_space). |
| 579 | bool Metaspace::class_space_is_initialized() { |
| 580 | return MetaspaceContext::context_class() != NULL__null; |
| 581 | } |
| 582 | |
| 583 | // Reserve a range of memory at an address suitable for en/decoding narrow |
| 584 | // Klass pointers (see: CompressedClassPointers::is_valid_base()). |
| 585 | // The returned address shall both be suitable as a compressed class pointers |
| 586 | // base, and aligned to Metaspace::reserve_alignment (which is equal to or a |
| 587 | // multiple of allocation granularity). |
| 588 | // On error, returns an unreserved space. |
| 589 | ReservedSpace Metaspace::reserve_address_space_for_compressed_classes(size_t size) { |
| 590 | |
| 591 | #if defined(AARCH64) || defined(PPC64) |
| 592 | const size_t alignment = Metaspace::reserve_alignment(); |
| 593 | |
| 594 | // AArch64: Try to align metaspace so that we can decode a compressed |
| 595 | // klass with a single MOVK instruction. We can do this iff the |
| 596 | // compressed class base is a multiple of 4G. |
| 597 | // Additionally, above 32G, ensure the lower LogKlassAlignmentInBytes bits |
| 598 | // of the upper 32-bits of the address are zero so we can handle a shift |
| 599 | // when decoding. |
| 600 | |
| 601 | // PPC64: smaller heaps up to 2g will be mapped just below 4g. Then the |
| 602 | // attempt to place the compressed class space just after the heap fails on |
| 603 | // Linux 4.1.42 and higher because the launcher is loaded at 4g |
| 604 | // (ELF_ET_DYN_BASE). In that case we reach here and search the address space |
| 605 | // below 32g to get a zerobased CCS. For simplicity we reuse the search |
| 606 | // strategy for AARCH64. |
| 607 | |
| 608 | static const struct { |
| 609 | address from; |
| 610 | address to; |
| 611 | size_t increment; |
| 612 | } search_ranges[] = { |
| 613 | { (address)(4*G), (address)(32*G), 4*G, }, |
| 614 | { (address)(32*G), (address)(1024*G), (4 << LogKlassAlignmentInBytes) * G }, |
| 615 | { NULL__null, NULL__null, 0 } |
| 616 | }; |
| 617 | |
| 618 | for (int i = 0; search_ranges[i].from != NULL__null; i ++) { |
| 619 | address a = search_ranges[i].from; |
| 620 | assert(CompressedKlassPointers::is_valid_base(a), "Sanity")do { if (!(CompressedKlassPointers::is_valid_base(a))) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 620, "assert(" "CompressedKlassPointers::is_valid_base(a)" ") failed" , "Sanity"); ::breakpoint(); } } while (0); |
| 621 | while (a < search_ranges[i].to) { |
| 622 | ReservedSpace rs(size, Metaspace::reserve_alignment(), |
| 623 | os::vm_page_size(), (char*)a); |
| 624 | if (rs.is_reserved()) { |
| 625 | assert(a == (address)rs.base(), "Sanity")do { if (!(a == (address)rs.base())) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 625, "assert(" "a == (address)rs.base()" ") failed", "Sanity" ); ::breakpoint(); } } while (0); |
| 626 | return rs; |
| 627 | } |
| 628 | a += search_ranges[i].increment; |
| 629 | } |
| 630 | } |
| 631 | #endif // defined(AARCH64) || defined(PPC64) |
| 632 | |
| 633 | #ifdef AARCH64 |
| 634 | // Note: on AARCH64, if the code above does not find any good placement, we |
| 635 | // have no recourse. We return an empty space and the VM will exit. |
| 636 | return ReservedSpace(); |
| 637 | #else |
| 638 | // Default implementation: Just reserve anywhere. |
| 639 | return ReservedSpace(size, Metaspace::reserve_alignment(), os::vm_page_size(), (char*)NULL__null); |
| 640 | #endif // AARCH64 |
| 641 | } |
| 642 | |
| 643 | #endif // _LP64 |
| 644 | |
| 645 | size_t Metaspace::reserve_alignment_words() { |
| 646 | return metaspace::Settings::virtual_space_node_reserve_alignment_words(); |
| 647 | } |
| 648 | |
| 649 | size_t Metaspace::commit_alignment_words() { |
| 650 | return metaspace::Settings::commit_granule_words(); |
| 651 | } |
| 652 | |
| 653 | void Metaspace::ergo_initialize() { |
| 654 | |
| 655 | // Must happen before using any setting from Settings::--- |
| 656 | metaspace::Settings::ergo_initialize(); |
| 657 | |
| 658 | // MaxMetaspaceSize and CompressedClassSpaceSize: |
| 659 | // |
| 660 | // MaxMetaspaceSize is the maximum size, in bytes, of memory we are allowed |
| 661 | // to commit for the Metaspace. |
| 662 | // It is just a number; a limit we compare against before committing. It |
| 663 | // does not have to be aligned to anything. |
| 664 | // It gets used as compare value before attempting to increase the metaspace |
| 665 | // commit charge. It defaults to max_uintx (unlimited). |
| 666 | // |
| 667 | // CompressedClassSpaceSize is the size, in bytes, of the address range we |
| 668 | // pre-reserve for the compressed class space (if we use class space). |
| 669 | // This size has to be aligned to the metaspace reserve alignment (to the |
| 670 | // size of a root chunk). It gets aligned up from whatever value the caller |
| 671 | // gave us to the next multiple of root chunk size. |
| 672 | // |
| 673 | // Note: Strictly speaking MaxMetaspaceSize and CompressedClassSpaceSize have |
| 674 | // very little to do with each other. The notion often encountered: |
| 675 | // MaxMetaspaceSize = CompressedClassSpaceSize + <non-class metadata size> |
| 676 | // is subtly wrong: MaxMetaspaceSize can besmaller than CompressedClassSpaceSize, |
| 677 | // in which case we just would not be able to fully commit the class space range. |
| 678 | // |
| 679 | // We still adjust CompressedClassSpaceSize to reasonable limits, mainly to |
| 680 | // save on reserved space, and to make ergnonomics less confusing. |
| 681 | |
| 682 | MaxMetaspaceSize = MAX2(MaxMetaspaceSize, commit_alignment()); |
| 683 | |
| 684 | if (UseCompressedClassPointers) { |
| 685 | // Let CCS size not be larger than 80% of MaxMetaspaceSize. Note that is |
| 686 | // grossly over-dimensioned for most usage scenarios; typical ratio of |
| 687 | // class space : non class space usage is about 1:6. With many small classes, |
| 688 | // it can get as low as 1:2. It is not a big deal though since ccs is only |
| 689 | // reserved and will be committed on demand only. |
| 690 | size_t max_ccs_size = MaxMetaspaceSize * 0.8; |
| 691 | size_t adjusted_ccs_size = MIN2(CompressedClassSpaceSize, max_ccs_size); |
| 692 | |
| 693 | // CCS must be aligned to root chunk size, and be at least the size of one |
| 694 | // root chunk. |
| 695 | adjusted_ccs_size = align_up(adjusted_ccs_size, reserve_alignment()); |
| 696 | adjusted_ccs_size = MAX2(adjusted_ccs_size, reserve_alignment()); |
| 697 | |
| 698 | // Note: re-adjusting may have us left with a CompressedClassSpaceSize |
| 699 | // larger than MaxMetaspaceSize for very small values of MaxMetaspaceSize. |
| 700 | // Lets just live with that, its not a big deal. |
| 701 | |
| 702 | if (adjusted_ccs_size != CompressedClassSpaceSize) { |
| 703 | FLAG_SET_ERGO(CompressedClassSpaceSize, adjusted_ccs_size)(Flag_CompressedClassSpaceSize_set((adjusted_ccs_size), JVMFlagOrigin ::ERGONOMIC)); |
| 704 | log_info(metaspace)(!(LogImpl<(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG)>::is_level(LogLevel::Info))) ? (void)0 : LogImpl <(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::write<LogLevel::Info>("Setting CompressedClassSpaceSize to " SIZE_FORMAT"%" "l" "u" ".", |
| 705 | CompressedClassSpaceSize); |
| 706 | } |
| 707 | } |
| 708 | |
| 709 | // Set MetaspaceSize, MinMetaspaceExpansion and MaxMetaspaceExpansion |
| 710 | if (MetaspaceSize > MaxMetaspaceSize) { |
| 711 | MetaspaceSize = MaxMetaspaceSize; |
| 712 | } |
| 713 | |
| 714 | MetaspaceSize = align_down_bounded(MetaspaceSize, commit_alignment()); |
| 715 | |
| 716 | assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize")do { if (!(MetaspaceSize <= MaxMetaspaceSize)) { (*g_assert_poison ) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 716, "assert(" "MetaspaceSize <= MaxMetaspaceSize" ") failed" , "MetaspaceSize should be limited by MaxMetaspaceSize"); ::breakpoint (); } } while (0); |
| 717 | |
| 718 | MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, commit_alignment()); |
| 719 | MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, commit_alignment()); |
| 720 | |
| 721 | } |
| 722 | |
| 723 | void Metaspace::global_initialize() { |
| 724 | MetaspaceGC::initialize(); // <- since we do not prealloc init chunks anymore is this still needed? |
| 725 | |
| 726 | metaspace::ChunkHeaderPool::initialize(); |
| 727 | |
| 728 | if (DumpSharedSpaces) { |
| 729 | assert(!UseSharedSpaces, "sanity")do { if (!(!UseSharedSpaces)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 729, "assert(" "!UseSharedSpaces" ") failed", "sanity"); :: breakpoint(); } } while (0); |
| 730 | MetaspaceShared::initialize_for_static_dump(); |
| 731 | } |
| 732 | |
| 733 | // If UseCompressedClassPointers=1, we have two cases: |
| 734 | // a) if CDS is active (runtime, Xshare=on), it will create the class space |
| 735 | // for us, initialize it and set up CompressedKlassPointers encoding. |
| 736 | // Class space will be reserved above the mapped archives. |
| 737 | // b) if CDS either deactivated (Xshare=off) or a static dump is to be done (Xshare:dump), |
| 738 | // we will create the class space on our own. It will be placed above the java heap, |
| 739 | // since we assume it has been placed in low |
| 740 | // address regions. We may rethink this (see JDK-8244943). Failing that, |
| 741 | // it will be placed anywhere. |
| 742 | |
| 743 | #if INCLUDE_CDS1 |
| 744 | // case (a) |
| 745 | if (UseSharedSpaces) { |
| 746 | if (!FLAG_IS_DEFAULT(CompressedClassSpaceBaseAddress)(JVMFlag::is_default(Flag_CompressedClassSpaceBaseAddress_enum ))) { |
| 747 | log_warning(metaspace)(!(LogImpl<(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG)>::is_level(LogLevel::Warning))) ? (void)0 : LogImpl <(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::write<LogLevel::Warning>("CDS active - ignoring CompressedClassSpaceBaseAddress."); |
| 748 | } |
| 749 | MetaspaceShared::initialize_runtime_shared_and_meta_spaces(); |
| 750 | // If any of the archived space fails to map, UseSharedSpaces |
| 751 | // is reset to false. |
| 752 | } |
| 753 | #endif // INCLUDE_CDS |
| 754 | |
| 755 | #ifdef _LP641 |
| 756 | |
| 757 | if (using_class_space() && !class_space_is_initialized()) { |
| 758 | assert(!UseSharedSpaces, "CDS archive is not mapped at this point")do { if (!(!UseSharedSpaces)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 758, "assert(" "!UseSharedSpaces" ") failed", "CDS archive is not mapped at this point" ); ::breakpoint(); } } while (0); |
| 759 | |
| 760 | // case (b) (No CDS) |
| 761 | ReservedSpace rs; |
| 762 | const size_t size = align_up(CompressedClassSpaceSize, Metaspace::reserve_alignment()); |
| 763 | address base = NULL__null; |
| 764 | |
| 765 | // If CompressedClassSpaceBaseAddress is set, we attempt to force-map class space to |
| 766 | // the given address. This is a debug-only feature aiding tests. Due to the ASLR lottery |
| 767 | // this may fail, in which case the VM will exit after printing an appropiate message. |
| 768 | // Tests using this switch should cope with that. |
| 769 | if (CompressedClassSpaceBaseAddress != 0) { |
| 770 | base = (address)CompressedClassSpaceBaseAddress; |
| 771 | if (!is_aligned(base, Metaspace::reserve_alignment())) { |
| 772 | vm_exit_during_initialization( |
| 773 | err_msg("CompressedClassSpaceBaseAddress=" PTR_FORMAT"0x%016" "l" "x" " invalid " |
| 774 | "(must be aligned to " SIZE_FORMAT_HEX"0x%" "l" "x" ").", |
| 775 | CompressedClassSpaceBaseAddress, Metaspace::reserve_alignment())); |
| 776 | } |
| 777 | rs = ReservedSpace(size, Metaspace::reserve_alignment(), |
| 778 | os::vm_page_size() /* large */, (char*)base); |
| 779 | if (rs.is_reserved()) { |
| 780 | log_info(metaspace)(!(LogImpl<(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG)>::is_level(LogLevel::Info))) ? (void)0 : LogImpl <(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::write<LogLevel::Info>("Sucessfully forced class space address to " PTR_FORMAT"0x%016" "l" "x", p2i(base)); |
| 781 | } else { |
| 782 | vm_exit_during_initialization( |
| 783 | err_msg("CompressedClassSpaceBaseAddress=" PTR_FORMAT"0x%016" "l" "x" " given, but reserving class space failed.", |
| 784 | CompressedClassSpaceBaseAddress)); |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | if (!rs.is_reserved()) { |
| 789 | // If UseCompressedOops=1 and the java heap has been placed in coops-friendly |
| 790 | // territory, i.e. its base is under 32G, then we attempt to place ccs |
| 791 | // right above the java heap. |
| 792 | // Otherwise the lower 32G are still free. We try to place ccs at the lowest |
| 793 | // allowed mapping address. |
| 794 | base = (UseCompressedOops && (uint64_t)CompressedOops::base() < OopEncodingHeapMax) ? |
| 795 | CompressedOops::end() : (address)HeapBaseMinAddress; |
| 796 | base = align_up(base, Metaspace::reserve_alignment()); |
| 797 | |
| 798 | if (base != NULL__null) { |
| 799 | if (CompressedKlassPointers::is_valid_base(base)) { |
| 800 | rs = ReservedSpace(size, Metaspace::reserve_alignment(), |
| 801 | os::vm_page_size(), (char*)base); |
| 802 | } |
| 803 | } |
| 804 | } |
| 805 | |
| 806 | // ...failing that, reserve anywhere, but let platform do optimized placement: |
| 807 | if (!rs.is_reserved()) { |
| 808 | rs = Metaspace::reserve_address_space_for_compressed_classes(size); |
| 809 | } |
| 810 | |
| 811 | // ...failing that, give up. |
| 812 | if (!rs.is_reserved()) { |
| 813 | vm_exit_during_initialization( |
| 814 | err_msg("Could not allocate compressed class space: " SIZE_FORMAT"%" "l" "u" " bytes", |
| 815 | CompressedClassSpaceSize)); |
| 816 | } |
| 817 | |
| 818 | // Initialize space |
| 819 | Metaspace::initialize_class_space(rs); |
| 820 | |
| 821 | // Set up compressed class pointer encoding. |
| 822 | CompressedKlassPointers::initialize((address)rs.base(), rs.size()); |
| 823 | } |
| 824 | |
| 825 | #endif |
| 826 | |
| 827 | // Initialize non-class virtual space list, and its chunk manager: |
| 828 | MetaspaceContext::initialize_nonclass_space_context(); |
| 829 | |
| 830 | _tracer = new MetaspaceTracer(); |
| 831 | |
| 832 | // We must prevent the very first address of the ccs from being used to store |
| 833 | // metadata, since that address would translate to a narrow pointer of 0, and the |
| 834 | // VM does not distinguish between "narrow 0 as in NULL" and "narrow 0 as in start |
| 835 | // of ccs". |
| 836 | // Before Elastic Metaspace that did not happen due to the fact that every Metachunk |
| 837 | // had a header and therefore could not allocate anything at offset 0. |
| 838 | #ifdef _LP641 |
| 839 | if (using_class_space()) { |
| 840 | // The simplest way to fix this is to allocate a tiny dummy chunk right at the |
| 841 | // start of ccs and do not use it for anything. |
| 842 | MetaspaceContext::context_class()->cm()->get_chunk(metaspace::chunklevel::HIGHEST_CHUNK_LEVEL); |
| 843 | } |
| 844 | #endif |
| 845 | |
| 846 | #ifdef _LP641 |
| 847 | if (UseCompressedClassPointers) { |
| 848 | // Note: "cds" would be a better fit but keep this for backward compatibility. |
| 849 | LogTarget(Info, gc, metaspace)LogTargetImpl<LogLevel::Info, (LogTag::_gc), (LogTag::_metaspace ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) , (LogTag::__NO_TAG)> lt; |
| 850 | if (lt.is_enabled()) { |
| 851 | ResourceMark rm; |
| 852 | LogStream ls(lt); |
| 853 | CDS_ONLY(MetaspaceShared::print_on(&ls);)MetaspaceShared::print_on(&ls); |
| 854 | Metaspace::print_compressed_class_space(&ls); |
| 855 | CompressedKlassPointers::print_mode(&ls); |
| 856 | } |
| 857 | } |
| 858 | #endif |
| 859 | |
| 860 | } |
| 861 | |
| 862 | void Metaspace::post_initialize() { |
| 863 | MetaspaceGC::post_initialize(); |
| 864 | } |
| 865 | |
| 866 | size_t Metaspace::max_allocation_word_size() { |
| 867 | return metaspace::chunklevel::MAX_CHUNK_WORD_SIZE; |
| 868 | } |
| 869 | |
| 870 | // This version of Metaspace::allocate does not throw OOM but simply returns NULL, and |
| 871 | // is suitable for calling from non-Java threads. |
| 872 | // Callers are responsible for checking null. |
| 873 | MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
| 874 | MetaspaceObj::Type type) { |
| 875 | assert(word_size <= Metaspace::max_allocation_word_size(),do { if (!(word_size <= Metaspace::max_allocation_word_size ())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 876, "assert(" "word_size <= Metaspace::max_allocation_word_size()" ") failed", "allocation size too large (" "%" "l" "u" ")", word_size ); ::breakpoint(); } } while (0) |
| 876 | "allocation size too large (" SIZE_FORMAT ")", word_size)do { if (!(word_size <= Metaspace::max_allocation_word_size ())) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 876, "assert(" "word_size <= Metaspace::max_allocation_word_size()" ") failed", "allocation size too large (" "%" "l" "u" ")", word_size ); ::breakpoint(); } } while (0); |
| 877 | |
| 878 | assert(loader_data != NULL, "Should never pass around a NULL loader_data. "do { if (!(loader_data != __null)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 879, "assert(" "loader_data != __null" ") failed", "Should never pass around a NULL loader_data. " "ClassLoaderData::the_null_class_loader_data() should have been used." ); ::breakpoint(); } } while (0) |
| 879 | "ClassLoaderData::the_null_class_loader_data() should have been used.")do { if (!(loader_data != __null)) { (*g_assert_poison) = 'X' ;; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 879, "assert(" "loader_data != __null" ") failed", "Should never pass around a NULL loader_data. " "ClassLoaderData::the_null_class_loader_data() should have been used." ); ::breakpoint(); } } while (0); |
| 880 | |
| 881 | // Deal with concurrent unloading failed allocation starvation |
| 882 | MetaspaceCriticalAllocation::block_if_concurrent_purge(); |
| 883 | |
| 884 | MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType; |
| 885 | |
| 886 | // Try to allocate metadata. |
| 887 | MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
| 888 | |
| 889 | if (result != NULL__null) { |
| 890 | // Zero initialize. |
| 891 | Copy::fill_to_words((HeapWord*)result, word_size, 0); |
| 892 | |
| 893 | log_trace(metaspace)(!(LogImpl<(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG)>::is_level(LogLevel::Trace))) ? (void)0 : LogImpl <(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::write<LogLevel::Trace>("Metaspace::allocate: type %d return " PTR_FORMAT"0x%016" "l" "x" ".", (int)type, p2i(result)); |
| 894 | } |
| 895 | |
| 896 | return result; |
| 897 | } |
| 898 | |
| 899 | MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
| 900 | MetaspaceObj::Type type, TRAPSJavaThread* __the_thread__) { |
| 901 | |
| 902 | if (HAS_PENDING_EXCEPTION(((ThreadShadow*)__the_thread__)->has_pending_exception())) { |
| 903 | assert(false, "Should not allocate with exception pending")do { if (!(false)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 903, "assert(" "false" ") failed", "Should not allocate with exception pending" ); ::breakpoint(); } } while (0); |
| 904 | return NULL__null; // caller does a CHECK_NULL too |
| 905 | } |
| 906 | |
| 907 | MetaWord* result = allocate(loader_data, word_size, type); |
| 908 | |
| 909 | if (result == NULL__null) { |
| 910 | MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType; |
| 911 | tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype); |
| 912 | |
| 913 | // Allocation failed. |
| 914 | if (is_init_completed()) { |
| 915 | // Only start a GC if the bootstrapping has completed. |
| 916 | // Try to clean out some heap memory and retry. This can prevent premature |
| 917 | // expansion of the metaspace. |
| 918 | result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype); |
| 919 | } |
| 920 | |
| 921 | if (result == NULL__null) { |
| 922 | report_metadata_oome(loader_data, word_size, type, mdtype, THREAD__the_thread__); |
| 923 | assert(HAS_PENDING_EXCEPTION, "sanity")do { if (!((((ThreadShadow*)__the_thread__)->has_pending_exception ()))) { (*g_assert_poison) = 'X';; report_vm_error("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 923, "assert(" "(((ThreadShadow*)__the_thread__)->has_pending_exception())" ") failed", "sanity"); ::breakpoint(); } } while (0); |
| 924 | return NULL__null; |
| 925 | } |
| 926 | |
| 927 | // Zero initialize. |
| 928 | Copy::fill_to_words((HeapWord*)result, word_size, 0); |
| 929 | |
| 930 | log_trace(metaspace)(!(LogImpl<(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag ::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag:: __NO_TAG)>::is_level(LogLevel::Trace))) ? (void)0 : LogImpl <(LogTag::_metaspace), (LogTag::__NO_TAG), (LogTag::__NO_TAG ), (LogTag::__NO_TAG), (LogTag::__NO_TAG), (LogTag::__NO_TAG) >::write<LogLevel::Trace>("Metaspace::allocate: type %d return " PTR_FORMAT"0x%016" "l" "x" ".", (int)type, p2i(result)); |
| 931 | } |
| 932 | |
| 933 | return result; |
| 934 | } |
| 935 | |
| 936 | void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPSJavaThread* __the_thread__) { |
| 937 | tracer()->report_metadata_oom(loader_data, word_size, type, mdtype); |
| 938 | |
| 939 | // If result is still null, we are out of memory. |
| 940 | Log(gc, metaspace, freelist, oom)LogImpl<(LogTag::_gc), (LogTag::_metaspace), (LogTag::_freelist ), (LogTag::_oom), (LogTag::__NO_TAG), (LogTag::__NO_TAG)> log; |
| 941 | if (log.is_info()) { |
| 942 | log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT"%" "l" "u", |
| 943 | is_class_space_allocation(mdtype) ? "class" : "data", word_size); |
| 944 | ResourceMark rm; |
| 945 | if (log.is_debug()) { |
| 946 | if (loader_data->metaspace_or_null() != NULL__null) { |
| 947 | LogStream ls(log.debug()); |
| 948 | loader_data->print_value_on(&ls); |
| 949 | } |
| 950 | } |
| 951 | LogStream ls(log.info()); |
| 952 | // In case of an OOM, log out a short but still useful report. |
| 953 | MetaspaceUtils::print_basic_report(&ls, 0); |
| 954 | } |
| 955 | |
| 956 | bool out_of_compressed_class_space = false; |
| 957 | if (is_class_space_allocation(mdtype)) { |
| 958 | ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null(); |
Value stored to 'metaspace' during its initialization is never read | |
| 959 | out_of_compressed_class_space = |
| 960 | MetaspaceUtils::committed_bytes(Metaspace::ClassType) + |
| 961 | align_up(word_size * BytesPerWord, 4 * M) > |
| 962 | CompressedClassSpaceSize; |
| 963 | } |
| 964 | |
| 965 | // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
| 966 | const char* space_string = out_of_compressed_class_space ? |
| 967 | "Compressed class space" : "Metaspace"; |
| 968 | |
| 969 | report_java_out_of_memory(space_string); |
| 970 | |
| 971 | if (JvmtiExport::should_post_resource_exhausted()) { |
| 972 | JvmtiExport::post_resource_exhausted( |
| 973 | JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
| 974 | space_string); |
| 975 | } |
| 976 | |
| 977 | if (!is_init_completed()) { |
| 978 | vm_exit_during_initialization("OutOfMemoryError", space_string); |
| 979 | } |
| 980 | |
| 981 | if (out_of_compressed_class_space) { |
| 982 | THROW_OOP(Universe::out_of_memory_error_class_metaspace()){ Exceptions::_throw_oop(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 982, Universe::out_of_memory_error_class_metaspace()); return ; }; |
| 983 | } else { |
| 984 | THROW_OOP(Universe::out_of_memory_error_metaspace()){ Exceptions::_throw_oop(__the_thread__, "/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 984, Universe::out_of_memory_error_metaspace()); return; }; |
| 985 | } |
| 986 | } |
| 987 | |
| 988 | const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) { |
| 989 | switch (mdtype) { |
| 990 | case Metaspace::ClassType: return "Class"; |
| 991 | case Metaspace::NonClassType: return "Metadata"; |
| 992 | default: |
| 993 | assert(false, "Got bad mdtype: %d", (int) mdtype)do { if (!(false)) { (*g_assert_poison) = 'X';; report_vm_error ("/home/daniel/Projects/java/jdk/src/hotspot/share/memory/metaspace.cpp" , 993, "assert(" "false" ") failed", "Got bad mdtype: %d", (int ) mdtype); ::breakpoint(); } } while (0); |
| 994 | return NULL__null; |
| 995 | } |
| 996 | } |
| 997 | |
| 998 | void Metaspace::purge() { |
| 999 | // The MetaspaceCritical_lock is used by a concurrent GC to block out concurrent metaspace |
| 1000 | // allocations, that would starve critical metaspace allocations, that are about to throw |
| 1001 | // OOM if they fail; they need precedence for correctness. |
| 1002 | MutexLocker ml(MetaspaceCritical_lock, Mutex::_no_safepoint_check_flag); |
| 1003 | ChunkManager* cm = ChunkManager::chunkmanager_nonclass(); |
| 1004 | if (cm != NULL__null) { |
| 1005 | cm->purge(); |
| 1006 | } |
| 1007 | if (using_class_space()) { |
| 1008 | cm = ChunkManager::chunkmanager_class(); |
| 1009 | if (cm != NULL__null) { |
| 1010 | cm->purge(); |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | MetaspaceCriticalAllocation::satisfy(); |
| 1015 | } |
| 1016 | |
| 1017 | bool Metaspace::contains(const void* ptr) { |
| 1018 | if (MetaspaceShared::is_in_shared_metaspace(ptr)) { |
| 1019 | return true; |
| 1020 | } |
| 1021 | return contains_non_shared(ptr); |
| 1022 | } |
| 1023 | |
| 1024 | bool Metaspace::contains_non_shared(const void* ptr) { |
| 1025 | if (using_class_space() && VirtualSpaceList::vslist_class()->contains((MetaWord*)ptr)) { |
| 1026 | return true; |
| 1027 | } |
| 1028 | |
| 1029 | return VirtualSpaceList::vslist_nonclass()->contains((MetaWord*)ptr); |
| 1030 | } |