1 /* 2 * Copyright (c) 2020, 2021, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2020 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 "logging/log.hpp" 28 #include "memory/classLoaderMetaspace.hpp" 29 #include "memory/metaspace.hpp" 30 #include "memory/metaspaceUtils.hpp" 31 #include "memory/metaspace/chunkManager.hpp" 32 #include "memory/metaspace/internalStats.hpp" 33 #include "memory/metaspace/metaspaceArena.hpp" 34 #include "memory/metaspace/metaspaceArenaGrowthPolicy.hpp" 35 #include "memory/metaspace/metaspaceSettings.hpp" 36 #include "memory/metaspace/metaspaceStatistics.hpp" 37 #include "memory/metaspace/runningCounters.hpp" 38 #include "memory/metaspaceTracer.hpp" 39 #include "utilities/debug.hpp" 40 41 using metaspace::ChunkManager; 42 using metaspace::MetaspaceArena; 43 using metaspace::ArenaGrowthPolicy; 44 using metaspace::RunningCounters; 45 using metaspace::InternalStats; 46 47 #define LOGFMT "CLMS @" PTR_FORMAT " " 48 #define LOGFMT_ARGS p2i(this) 49 50 ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType space_type) : 51 _lock(lock), 52 _space_type(space_type), 53 _non_class_space_arena(NULL), 54 _class_space_arena(NULL) 55 { 56 ChunkManager* const non_class_cm = 57 ChunkManager::chunkmanager_nonclass(); 58 59 // Initialize non-class Arena 60 _non_class_space_arena = new MetaspaceArena( 61 non_class_cm, 62 ArenaGrowthPolicy::policy_for_space_type(space_type, false), 63 lock, 64 RunningCounters::used_nonclass_counter(), 65 "non-class sm"); 66 67 // If needed, initialize class arena 68 if (Metaspace::using_class_space()) { 69 ChunkManager* const class_cm = 70 ChunkManager::chunkmanager_class(); 71 _class_space_arena = new MetaspaceArena( 72 class_cm, 73 ArenaGrowthPolicy::policy_for_space_type(space_type, true), 74 lock, 75 RunningCounters::used_class_counter(), 76 "class sm"); 77 } 78 79 UL2(debug, "born (nonclass arena: " PTR_FORMAT ", class arena: " PTR_FORMAT ".", 80 p2i(_non_class_space_arena), p2i(_class_space_arena)); 81 } 82 83 ClassLoaderMetaspace::~ClassLoaderMetaspace() { 84 UL(debug, "dies."); 85 86 delete _non_class_space_arena; 87 delete _class_space_arena; 88 89 } 90 91 // Allocate word_size words from Metaspace. 92 MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdType) { 93 if (Metaspace::is_class_space_allocation(mdType)) { 94 return class_space_arena()->allocate(word_size); 95 } else { 96 return non_class_space_arena()->allocate(word_size); 97 } 98 } 99 100 // Attempt to expand the GC threshold to be good for at least another word_size words 101 // and allocate. Returns NULL if failure. Used during Metaspace GC. 102 MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdType) { 103 size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord); 104 assert(delta_bytes > 0, "Must be"); 105 106 size_t before = 0; 107 size_t after = 0; 108 bool can_retry = true; 109 MetaWord* res; 110 bool incremented; 111 112 // Each thread increments the HWM at most once. Even if the thread fails to increment 113 // the HWM, an allocation is still attempted. This is because another thread must then 114 // have incremented the HWM and therefore the allocation might still succeed. 115 do { 116 incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before, &can_retry); 117 res = allocate(word_size, mdType); 118 } while (!incremented && res == NULL && can_retry); 119 120 if (incremented) { 121 Metaspace::tracer()->report_gc_threshold(before, after, 122 MetaspaceGCThresholdUpdater::ExpandAndAllocate); 123 // Keeping both for now until I am sure the old variant (gc + metaspace) is not needed anymore 124 log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after); 125 UL2(info, "GC threshold increased: " SIZE_FORMAT "->" SIZE_FORMAT ".", before, after); 126 } 127 128 return res; 129 } 130 131 // Prematurely returns a metaspace allocation to the _block_freelists 132 // because it is not needed anymore. 133 void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { 134 if (Metaspace::using_class_space() && is_class) { 135 class_space_arena()->deallocate(ptr, word_size); 136 } else { 137 non_class_space_arena()->deallocate(ptr, word_size); 138 } 139 DEBUG_ONLY(InternalStats::inc_num_deallocs();) 140 } 141 142 // Update statistics. This walks all in-use chunks. 143 void ClassLoaderMetaspace::add_to_statistics(metaspace::ClmsStats* out) const { 144 if (non_class_space_arena() != NULL) { 145 non_class_space_arena()->add_to_statistics(&out->_arena_stats_nonclass); 146 } 147 if (class_space_arena() != NULL) { 148 class_space_arena()->add_to_statistics(&out->_arena_stats_class); 149 } 150 } 151 152 #ifdef ASSERT 153 void ClassLoaderMetaspace::verify() const { 154 if (non_class_space_arena() != NULL) { 155 non_class_space_arena()->verify(); 156 } 157 if (class_space_arena() != NULL) { 158 class_space_arena()->verify(); 159 } 160 } 161 #endif // ASSERT 162 163 // This only exists for JFR and jcmd VM.classloader_stats. We may want to 164 // change this. Capacity as a stat is of questionable use since it may 165 // contain committed and uncommitted areas. For now we do this to maintain 166 // backward compatibility with JFR. 167 void ClassLoaderMetaspace::calculate_jfr_stats(size_t* p_used_bytes, size_t* p_capacity_bytes) const { 168 // Implement this using the standard statistics objects. 169 size_t used_c = 0, cap_c = 0, used_nc = 0, cap_nc = 0; 170 if (non_class_space_arena() != NULL) { 171 non_class_space_arena()->usage_numbers(&used_nc, NULL, &cap_nc); 172 } 173 if (class_space_arena() != NULL) { 174 class_space_arena()->usage_numbers(&used_c, NULL, &cap_c); 175 } 176 if (p_used_bytes != NULL) { 177 *p_used_bytes = used_c + used_nc; 178 } 179 if (p_capacity_bytes != NULL) { 180 *p_capacity_bytes = cap_c + cap_nc; 181 } 182 } 183