50193
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/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "logging/log.hpp"
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#include "logging/logStream.hpp"
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#include "memory/metaspace/chunkManager.hpp"
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#include "memory/metaspace/metachunk.hpp"
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#include "memory/metaspace/metaDebug.hpp"
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#include "memory/metaspace/metaspaceCommon.hpp"
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#include "memory/metaspace/spaceManager.hpp"
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#include "memory/metaspace/virtualSpaceList.hpp"
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#include "runtime/atomic.hpp"
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#include "runtime/init.hpp"
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#include "services/memoryService.hpp"
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#include "utilities/debug.hpp"
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#include "utilities/globalDefinitions.hpp"
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namespace metaspace {
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#define assert_counter(expected_value, real_value, msg) \
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assert( (expected_value) == (real_value), \
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"Counter mismatch (%s): expected " SIZE_FORMAT \
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", but got: " SIZE_FORMAT ".", msg, expected_value, \
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real_value);
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// SpaceManager methods
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size_t SpaceManager::adjust_initial_chunk_size(size_t requested, bool is_class_space) {
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size_t chunk_sizes[] = {
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specialized_chunk_size(is_class_space),
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small_chunk_size(is_class_space),
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medium_chunk_size(is_class_space)
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};
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// Adjust up to one of the fixed chunk sizes ...
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for (size_t i = 0; i < ARRAY_SIZE(chunk_sizes); i++) {
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if (requested <= chunk_sizes[i]) {
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return chunk_sizes[i];
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}
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}
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// ... or return the size as a humongous chunk.
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return requested;
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}
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size_t SpaceManager::adjust_initial_chunk_size(size_t requested) const {
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return adjust_initial_chunk_size(requested, is_class());
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}
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size_t SpaceManager::get_initial_chunk_size(Metaspace::MetaspaceType type) const {
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size_t requested;
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if (is_class()) {
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switch (type) {
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case Metaspace::BootMetaspaceType: requested = Metaspace::first_class_chunk_word_size(); break;
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case Metaspace::AnonymousMetaspaceType: requested = ClassSpecializedChunk; break;
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case Metaspace::ReflectionMetaspaceType: requested = ClassSpecializedChunk; break;
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default: requested = ClassSmallChunk; break;
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}
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} else {
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switch (type) {
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case Metaspace::BootMetaspaceType: requested = Metaspace::first_chunk_word_size(); break;
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case Metaspace::AnonymousMetaspaceType: requested = SpecializedChunk; break;
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case Metaspace::ReflectionMetaspaceType: requested = SpecializedChunk; break;
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default: requested = SmallChunk; break;
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}
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}
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// Adjust to one of the fixed chunk sizes (unless humongous)
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const size_t adjusted = adjust_initial_chunk_size(requested);
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assert(adjusted != 0, "Incorrect initial chunk size. Requested: "
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SIZE_FORMAT " adjusted: " SIZE_FORMAT, requested, adjusted);
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return adjusted;
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}
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void SpaceManager::locked_print_chunks_in_use_on(outputStream* st) const {
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for (ChunkIndex i = ZeroIndex; i < NumberOfInUseLists; i = next_chunk_index(i)) {
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st->print("SpaceManager: " UINTX_FORMAT " %s chunks.",
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num_chunks_by_type(i), chunk_size_name(i));
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}
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chunk_manager()->locked_print_free_chunks(st);
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}
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size_t SpaceManager::calc_chunk_size(size_t word_size) {
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// Decide between a small chunk and a medium chunk. Up to
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// _small_chunk_limit small chunks can be allocated.
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// After that a medium chunk is preferred.
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size_t chunk_word_size;
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// Special case for anonymous metadata space.
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// Anonymous metadata space is usually small, with majority within 1K - 2K range and
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// rarely about 4K (64-bits JVM).
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// Instead of jumping to SmallChunk after initial chunk exhausted, keeping allocation
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// from SpecializeChunk up to _anon_or_delegating_metadata_specialize_chunk_limit (4)
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// reduces space waste from 60+% to around 30%.
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if ((_space_type == Metaspace::AnonymousMetaspaceType || _space_type == Metaspace::ReflectionMetaspaceType) &&
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_mdtype == Metaspace::NonClassType &&
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num_chunks_by_type(SpecializedIndex) < anon_and_delegating_metadata_specialize_chunk_limit &&
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word_size + Metachunk::overhead() <= SpecializedChunk) {
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return SpecializedChunk;
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}
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if (num_chunks_by_type(MediumIndex) == 0 &&
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num_chunks_by_type(SmallIndex) < small_chunk_limit) {
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chunk_word_size = (size_t) small_chunk_size();
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if (word_size + Metachunk::overhead() > small_chunk_size()) {
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chunk_word_size = medium_chunk_size();
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}
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} else {
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chunk_word_size = medium_chunk_size();
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}
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// Might still need a humongous chunk. Enforce
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// humongous allocations sizes to be aligned up to
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// the smallest chunk size.
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size_t if_humongous_sized_chunk =
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align_up(word_size + Metachunk::overhead(),
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smallest_chunk_size());
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chunk_word_size =
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MAX2((size_t) chunk_word_size, if_humongous_sized_chunk);
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assert(!SpaceManager::is_humongous(word_size) ||
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chunk_word_size == if_humongous_sized_chunk,
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"Size calculation is wrong, word_size " SIZE_FORMAT
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" chunk_word_size " SIZE_FORMAT,
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word_size, chunk_word_size);
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Log(gc, metaspace, alloc) log;
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if (log.is_debug() && SpaceManager::is_humongous(word_size)) {
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log.debug("Metadata humongous allocation:");
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log.debug(" word_size " PTR_FORMAT, word_size);
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log.debug(" chunk_word_size " PTR_FORMAT, chunk_word_size);
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log.debug(" chunk overhead " PTR_FORMAT, Metachunk::overhead());
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}
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return chunk_word_size;
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}
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void SpaceManager::track_metaspace_memory_usage() {
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if (is_init_completed()) {
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if (is_class()) {
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MemoryService::track_compressed_class_memory_usage();
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}
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MemoryService::track_metaspace_memory_usage();
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}
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}
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MetaWord* SpaceManager::grow_and_allocate(size_t word_size) {
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assert_lock_strong(_lock);
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assert(vs_list()->current_virtual_space() != NULL,
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"Should have been set");
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assert(current_chunk() == NULL ||
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current_chunk()->allocate(word_size) == NULL,
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"Don't need to expand");
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MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag);
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if (log_is_enabled(Trace, gc, metaspace, freelist)) {
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size_t words_left = 0;
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size_t words_used = 0;
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if (current_chunk() != NULL) {
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words_left = current_chunk()->free_word_size();
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words_used = current_chunk()->used_word_size();
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}
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log_trace(gc, metaspace, freelist)("SpaceManager::grow_and_allocate for " SIZE_FORMAT " words " SIZE_FORMAT " words used " SIZE_FORMAT " words left",
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word_size, words_used, words_left);
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}
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// Get another chunk
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size_t chunk_word_size = calc_chunk_size(word_size);
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Metachunk* next = get_new_chunk(chunk_word_size);
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MetaWord* mem = NULL;
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// If a chunk was available, add it to the in-use chunk list
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// and do an allocation from it.
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if (next != NULL) {
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// Add to this manager's list of chunks in use.
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// If the new chunk is humongous, it was created to serve a single large allocation. In that
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// case it usually makes no sense to make it the current chunk, since the next allocation would
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// need to allocate a new chunk anyway, while we would now prematurely retire a perfectly
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// good chunk which could be used for more normal allocations.
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bool make_current = true;
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if (next->get_chunk_type() == HumongousIndex &&
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current_chunk() != NULL) {
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make_current = false;
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}
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add_chunk(next, make_current);
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mem = next->allocate(word_size);
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}
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// Track metaspace memory usage statistic.
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track_metaspace_memory_usage();
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return mem;
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}
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void SpaceManager::print_on(outputStream* st) const {
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SpaceManagerStatistics stat;
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add_to_statistics(&stat); // will lock _lock.
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stat.print_on(st, 1*K, false);
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}
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SpaceManager::SpaceManager(Metaspace::MetadataType mdtype,
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Metaspace::MetaspaceType space_type,//
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Mutex* lock) :
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_mdtype(mdtype),
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_space_type(space_type),
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_capacity_words(0),
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_used_words(0),
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_overhead_words(0),
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_block_freelists(NULL),
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_lock(lock),
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_chunk_list(NULL),
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_current_chunk(NULL)
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{
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Metadebug::init_allocation_fail_alot_count();
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memset(_num_chunks_by_type, 0, sizeof(_num_chunks_by_type));
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log_trace(gc, metaspace, freelist)("SpaceManager(): " PTR_FORMAT, p2i(this));
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}
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void SpaceManager::account_for_new_chunk(const Metachunk* new_chunk) {
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assert_lock_strong(MetaspaceExpand_lock);
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_capacity_words += new_chunk->word_size();
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_overhead_words += Metachunk::overhead();
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DEBUG_ONLY(new_chunk->verify());
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_num_chunks_by_type[new_chunk->get_chunk_type()] ++;
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// Adjust global counters:
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MetaspaceUtils::inc_capacity(mdtype(), new_chunk->word_size());
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MetaspaceUtils::inc_overhead(mdtype(), Metachunk::overhead());
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}
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void SpaceManager::account_for_allocation(size_t words) {
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// Note: we should be locked with the ClassloaderData-specific metaspace lock.
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// We may or may not be locked with the global metaspace expansion lock.
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assert_lock_strong(lock());
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// Add to the per SpaceManager totals. This can be done non-atomically.
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_used_words += words;
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// Adjust global counters. This will be done atomically.
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MetaspaceUtils::inc_used(mdtype(), words);
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}
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void SpaceManager::account_for_spacemanager_death() {
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assert_lock_strong(MetaspaceExpand_lock);
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MetaspaceUtils::dec_capacity(mdtype(), _capacity_words);
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MetaspaceUtils::dec_overhead(mdtype(), _overhead_words);
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MetaspaceUtils::dec_used(mdtype(), _used_words);
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}
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SpaceManager::~SpaceManager() {
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// This call this->_lock which can't be done while holding MetaspaceExpand_lock
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DEBUG_ONLY(verify_metrics());
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MutexLockerEx fcl(MetaspaceExpand_lock,
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Mutex::_no_safepoint_check_flag);
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chunk_manager()->slow_locked_verify();
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account_for_spacemanager_death();
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Log(gc, metaspace, freelist) log;
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if (log.is_trace()) {
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log.trace("~SpaceManager(): " PTR_FORMAT, p2i(this));
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ResourceMark rm;
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LogStream ls(log.trace());
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locked_print_chunks_in_use_on(&ls);
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if (block_freelists() != NULL) {
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block_freelists()->print_on(&ls);
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}
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}
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// Add all the chunks in use by this space manager
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// to the global list of free chunks.
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// Follow each list of chunks-in-use and add them to the
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// free lists. Each list is NULL terminated.
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chunk_manager()->return_chunk_list(chunk_list());
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#ifdef ASSERT
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_chunk_list = NULL;
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_current_chunk = NULL;
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#endif
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chunk_manager()->slow_locked_verify();
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if (_block_freelists != NULL) {
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delete _block_freelists;
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}
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}
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void SpaceManager::deallocate(MetaWord* p, size_t word_size) {
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assert_lock_strong(lock());
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// Allocations and deallocations are in raw_word_size
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size_t raw_word_size = get_allocation_word_size(word_size);
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// Lazily create a block_freelist
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if (block_freelists() == NULL) {
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_block_freelists = new BlockFreelist();
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}
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block_freelists()->return_block(p, raw_word_size);
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DEBUG_ONLY(Atomic::inc(&(g_internal_statistics.num_deallocs)));
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}
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// Adds a chunk to the list of chunks in use.
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void SpaceManager::add_chunk(Metachunk* new_chunk, bool make_current) {
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assert_lock_strong(_lock);
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assert(new_chunk != NULL, "Should not be NULL");
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assert(new_chunk->next() == NULL, "Should not be on a list");
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new_chunk->reset_empty();
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// Find the correct list and and set the current
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// chunk for that list.
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ChunkIndex index = chunk_manager()->list_index(new_chunk->word_size());
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if (make_current) {
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// If we are to make the chunk current, retire the old current chunk and replace
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// it with the new chunk.
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retire_current_chunk();
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set_current_chunk(new_chunk);
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}
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// Add the new chunk at the head of its respective chunk list.
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new_chunk->set_next(_chunk_list);
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_chunk_list = new_chunk;
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// Adjust counters.
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account_for_new_chunk(new_chunk);
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assert(new_chunk->is_empty(), "Not ready for reuse");
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Log(gc, metaspace, freelist) log;
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if (log.is_trace()) {
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log.trace("SpaceManager::added chunk: ");
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ResourceMark rm;
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LogStream ls(log.trace());
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new_chunk->print_on(&ls);
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chunk_manager()->locked_print_free_chunks(&ls);
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}
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}
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void SpaceManager::retire_current_chunk() {
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if (current_chunk() != NULL) {
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size_t remaining_words = current_chunk()->free_word_size();
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if (remaining_words >= SmallBlocks::small_block_min_size()) {
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MetaWord* ptr = current_chunk()->allocate(remaining_words);
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deallocate(ptr, remaining_words);
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account_for_allocation(remaining_words);
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}
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}
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}
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Metachunk* SpaceManager::get_new_chunk(size_t chunk_word_size) {
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// Get a chunk from the chunk freelist
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Metachunk* next = chunk_manager()->chunk_freelist_allocate(chunk_word_size);
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387 |
if (next == NULL) {
|
|
388 |
next = vs_list()->get_new_chunk(chunk_word_size,
|
|
389 |
medium_chunk_bunch());
|
|
390 |
}
|
|
391 |
|
|
392 |
Log(gc, metaspace, alloc) log;
|
|
393 |
if (log.is_debug() && next != NULL &&
|
|
394 |
SpaceManager::is_humongous(next->word_size())) {
|
|
395 |
log.debug(" new humongous chunk word size " PTR_FORMAT, next->word_size());
|
|
396 |
}
|
|
397 |
|
|
398 |
return next;
|
|
399 |
}
|
|
400 |
|
|
401 |
MetaWord* SpaceManager::allocate(size_t word_size) {
|
|
402 |
MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
|
|
403 |
size_t raw_word_size = get_allocation_word_size(word_size);
|
|
404 |
BlockFreelist* fl = block_freelists();
|
|
405 |
MetaWord* p = NULL;
|
|
406 |
|
|
407 |
DEBUG_ONLY(if (VerifyMetaspace) verify_metrics_locked());
|
|
408 |
|
|
409 |
// Allocation from the dictionary is expensive in the sense that
|
|
410 |
// the dictionary has to be searched for a size. Don't allocate
|
|
411 |
// from the dictionary until it starts to get fat. Is this
|
|
412 |
// a reasonable policy? Maybe an skinny dictionary is fast enough
|
|
413 |
// for allocations. Do some profiling. JJJ
|
|
414 |
if (fl != NULL && fl->total_size() > allocation_from_dictionary_limit) {
|
|
415 |
p = fl->get_block(raw_word_size);
|
|
416 |
if (p != NULL) {
|
|
417 |
DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs_from_deallocated_blocks));
|
|
418 |
}
|
|
419 |
}
|
|
420 |
if (p == NULL) {
|
|
421 |
p = allocate_work(raw_word_size);
|
|
422 |
}
|
|
423 |
|
|
424 |
return p;
|
|
425 |
}
|
|
426 |
|
|
427 |
// Returns the address of spaced allocated for "word_size".
|
|
428 |
// This methods does not know about blocks (Metablocks)
|
|
429 |
MetaWord* SpaceManager::allocate_work(size_t word_size) {
|
|
430 |
assert_lock_strong(lock());
|
|
431 |
#ifdef ASSERT
|
|
432 |
if (Metadebug::test_metadata_failure()) {
|
|
433 |
return NULL;
|
|
434 |
}
|
|
435 |
#endif
|
|
436 |
// Is there space in the current chunk?
|
|
437 |
MetaWord* result = NULL;
|
|
438 |
|
|
439 |
if (current_chunk() != NULL) {
|
|
440 |
result = current_chunk()->allocate(word_size);
|
|
441 |
}
|
|
442 |
|
|
443 |
if (result == NULL) {
|
|
444 |
result = grow_and_allocate(word_size);
|
|
445 |
}
|
|
446 |
|
|
447 |
if (result != NULL) {
|
|
448 |
account_for_allocation(word_size);
|
|
449 |
}
|
|
450 |
|
|
451 |
return result;
|
|
452 |
}
|
|
453 |
|
|
454 |
void SpaceManager::verify() {
|
|
455 |
Metachunk* curr = chunk_list();
|
|
456 |
while (curr != NULL) {
|
|
457 |
DEBUG_ONLY(do_verify_chunk(curr);)
|
|
458 |
assert(curr->is_tagged_free() == false, "Chunk should be tagged as in use.");
|
|
459 |
curr = curr->next();
|
|
460 |
}
|
|
461 |
}
|
|
462 |
|
|
463 |
void SpaceManager::verify_chunk_size(Metachunk* chunk) {
|
|
464 |
assert(is_humongous(chunk->word_size()) ||
|
|
465 |
chunk->word_size() == medium_chunk_size() ||
|
|
466 |
chunk->word_size() == small_chunk_size() ||
|
|
467 |
chunk->word_size() == specialized_chunk_size(),
|
|
468 |
"Chunk size is wrong");
|
|
469 |
return;
|
|
470 |
}
|
|
471 |
|
|
472 |
void SpaceManager::add_to_statistics_locked(SpaceManagerStatistics* out) const {
|
|
473 |
assert_lock_strong(lock());
|
|
474 |
Metachunk* chunk = chunk_list();
|
|
475 |
while (chunk != NULL) {
|
|
476 |
UsedChunksStatistics& chunk_stat = out->chunk_stats(chunk->get_chunk_type());
|
|
477 |
chunk_stat.add_num(1);
|
|
478 |
chunk_stat.add_cap(chunk->word_size());
|
|
479 |
chunk_stat.add_overhead(Metachunk::overhead());
|
|
480 |
chunk_stat.add_used(chunk->used_word_size() - Metachunk::overhead());
|
|
481 |
if (chunk != current_chunk()) {
|
|
482 |
chunk_stat.add_waste(chunk->free_word_size());
|
|
483 |
} else {
|
|
484 |
chunk_stat.add_free(chunk->free_word_size());
|
|
485 |
}
|
|
486 |
chunk = chunk->next();
|
|
487 |
}
|
|
488 |
if (block_freelists() != NULL) {
|
|
489 |
out->add_free_blocks_info(block_freelists()->num_blocks(), block_freelists()->total_size());
|
|
490 |
}
|
|
491 |
}
|
|
492 |
|
|
493 |
void SpaceManager::add_to_statistics(SpaceManagerStatistics* out) const {
|
|
494 |
MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
|
|
495 |
add_to_statistics_locked(out);
|
|
496 |
}
|
|
497 |
|
|
498 |
#ifdef ASSERT
|
|
499 |
void SpaceManager::verify_metrics_locked() const {
|
|
500 |
assert_lock_strong(lock());
|
|
501 |
|
|
502 |
SpaceManagerStatistics stat;
|
|
503 |
add_to_statistics_locked(&stat);
|
|
504 |
|
|
505 |
UsedChunksStatistics chunk_stats = stat.totals();
|
|
506 |
|
|
507 |
DEBUG_ONLY(chunk_stats.check_sanity());
|
|
508 |
|
|
509 |
assert_counter(_capacity_words, chunk_stats.cap(), "SpaceManager::_capacity_words");
|
|
510 |
assert_counter(_used_words, chunk_stats.used(), "SpaceManager::_used_words");
|
|
511 |
assert_counter(_overhead_words, chunk_stats.overhead(), "SpaceManager::_overhead_words");
|
|
512 |
}
|
|
513 |
|
|
514 |
void SpaceManager::verify_metrics() const {
|
|
515 |
MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag);
|
|
516 |
verify_metrics_locked();
|
|
517 |
}
|
|
518 |
#endif // ASSERT
|
|
519 |
|
|
520 |
|
|
521 |
} // namespace metaspace
|
|
522 |
|