| /* |
| * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| |
| #include "aot/aotLoader.hpp" |
| #include "gc/shared/collectedHeap.hpp" |
| #include "logging/log.hpp" |
| #include "logging/logStream.hpp" |
| #include "memory/filemap.hpp" |
| #include "memory/metaspace.hpp" |
| #include "memory/metaspace/chunkManager.hpp" |
| #include "memory/metaspace/metachunk.hpp" |
| #include "memory/metaspace/metaspaceCommon.hpp" |
| #include "memory/metaspace/printCLDMetaspaceInfoClosure.hpp" |
| #include "memory/metaspace/spaceManager.hpp" |
| #include "memory/metaspace/virtualSpaceList.hpp" |
| #include "memory/metaspaceShared.hpp" |
| #include "memory/metaspaceTracer.hpp" |
| #include "memory/universe.hpp" |
| #include "runtime/init.hpp" |
| #include "runtime/orderAccess.hpp" |
| #include "services/memTracker.hpp" |
| #include "utilities/copy.hpp" |
| #include "utilities/debug.hpp" |
| #include "utilities/formatBuffer.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| |
| |
| using namespace metaspace; |
| |
| MetaWord* last_allocated = 0; |
| |
| size_t Metaspace::_compressed_class_space_size; |
| const MetaspaceTracer* Metaspace::_tracer = NULL; |
| |
| DEBUG_ONLY(bool Metaspace::_frozen = false;) |
| |
| static const char* space_type_name(Metaspace::MetaspaceType t) { |
| const char* s = NULL; |
| switch (t) { |
| case Metaspace::StandardMetaspaceType: s = "Standard"; break; |
| case Metaspace::BootMetaspaceType: s = "Boot"; break; |
| case Metaspace::UnsafeAnonymousMetaspaceType: s = "UnsafeAnonymous"; break; |
| case Metaspace::ReflectionMetaspaceType: s = "Reflection"; break; |
| default: ShouldNotReachHere(); |
| } |
| return s; |
| } |
| |
| volatile size_t MetaspaceGC::_capacity_until_GC = 0; |
| uint MetaspaceGC::_shrink_factor = 0; |
| bool MetaspaceGC::_should_concurrent_collect = false; |
| |
| // BlockFreelist methods |
| |
| // VirtualSpaceNode methods |
| |
| // MetaspaceGC methods |
| |
| // VM_CollectForMetadataAllocation is the vm operation used to GC. |
| // Within the VM operation after the GC the attempt to allocate the metadata |
| // should succeed. If the GC did not free enough space for the metaspace |
| // allocation, the HWM is increased so that another virtualspace will be |
| // allocated for the metadata. With perm gen the increase in the perm |
| // gen had bounds, MinMetaspaceExpansion and MaxMetaspaceExpansion. The |
| // metaspace policy uses those as the small and large steps for the HWM. |
| // |
| // After the GC the compute_new_size() for MetaspaceGC is called to |
| // resize the capacity of the metaspaces. The current implementation |
| // is based on the flags MinMetaspaceFreeRatio and MaxMetaspaceFreeRatio used |
| // to resize the Java heap by some GC's. New flags can be implemented |
| // if really needed. MinMetaspaceFreeRatio is used to calculate how much |
| // free space is desirable in the metaspace capacity to decide how much |
| // to increase the HWM. MaxMetaspaceFreeRatio is used to decide how much |
| // free space is desirable in the metaspace capacity before decreasing |
| // the HWM. |
| |
| // Calculate the amount to increase the high water mark (HWM). |
| // Increase by a minimum amount (MinMetaspaceExpansion) so that |
| // another expansion is not requested too soon. If that is not |
| // enough to satisfy the allocation, increase by MaxMetaspaceExpansion. |
| // If that is still not enough, expand by the size of the allocation |
| // plus some. |
| size_t MetaspaceGC::delta_capacity_until_GC(size_t bytes) { |
| size_t min_delta = MinMetaspaceExpansion; |
| size_t max_delta = MaxMetaspaceExpansion; |
| size_t delta = align_up(bytes, Metaspace::commit_alignment()); |
| |
| if (delta <= min_delta) { |
| delta = min_delta; |
| } else if (delta <= max_delta) { |
| // Don't want to hit the high water mark on the next |
| // allocation so make the delta greater than just enough |
| // for this allocation. |
| delta = max_delta; |
| } else { |
| // This allocation is large but the next ones are probably not |
| // so increase by the minimum. |
| delta = delta + min_delta; |
| } |
| |
| assert_is_aligned(delta, Metaspace::commit_alignment()); |
| |
| return delta; |
| } |
| |
| size_t MetaspaceGC::capacity_until_GC() { |
| size_t value = OrderAccess::load_acquire(&_capacity_until_GC); |
| assert(value >= MetaspaceSize, "Not initialized properly?"); |
| return value; |
| } |
| |
| bool MetaspaceGC::inc_capacity_until_GC(size_t v, size_t* new_cap_until_GC, size_t* old_cap_until_GC) { |
| assert_is_aligned(v, Metaspace::commit_alignment()); |
| |
| size_t old_capacity_until_GC = _capacity_until_GC; |
| size_t new_value = old_capacity_until_GC + v; |
| |
| if (new_value < old_capacity_until_GC) { |
| // The addition wrapped around, set new_value to aligned max value. |
| new_value = align_down(max_uintx, Metaspace::commit_alignment()); |
| } |
| |
| size_t prev_value = Atomic::cmpxchg(new_value, &_capacity_until_GC, old_capacity_until_GC); |
| |
| if (old_capacity_until_GC != prev_value) { |
| return false; |
| } |
| |
| if (new_cap_until_GC != NULL) { |
| *new_cap_until_GC = new_value; |
| } |
| if (old_cap_until_GC != NULL) { |
| *old_cap_until_GC = old_capacity_until_GC; |
| } |
| return true; |
| } |
| |
| size_t MetaspaceGC::dec_capacity_until_GC(size_t v) { |
| assert_is_aligned(v, Metaspace::commit_alignment()); |
| |
| return Atomic::sub(v, &_capacity_until_GC); |
| } |
| |
| void MetaspaceGC::initialize() { |
| // Set the high-water mark to MaxMetapaceSize during VM initializaton since |
| // we can't do a GC during initialization. |
| _capacity_until_GC = MaxMetaspaceSize; |
| } |
| |
| void MetaspaceGC::post_initialize() { |
| // Reset the high-water mark once the VM initialization is done. |
| _capacity_until_GC = MAX2(MetaspaceUtils::committed_bytes(), MetaspaceSize); |
| } |
| |
| bool MetaspaceGC::can_expand(size_t word_size, bool is_class) { |
| // Check if the compressed class space is full. |
| if (is_class && Metaspace::using_class_space()) { |
| size_t class_committed = MetaspaceUtils::committed_bytes(Metaspace::ClassType); |
| if (class_committed + word_size * BytesPerWord > CompressedClassSpaceSize) { |
| log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (CompressedClassSpaceSize = " SIZE_FORMAT " words)", |
| (is_class ? "class" : "non-class"), word_size, CompressedClassSpaceSize / sizeof(MetaWord)); |
| return false; |
| } |
| } |
| |
| // Check if the user has imposed a limit on the metaspace memory. |
| size_t committed_bytes = MetaspaceUtils::committed_bytes(); |
| if (committed_bytes + word_size * BytesPerWord > MaxMetaspaceSize) { |
| log_trace(gc, metaspace, freelist)("Cannot expand %s metaspace by " SIZE_FORMAT " words (MaxMetaspaceSize = " SIZE_FORMAT " words)", |
| (is_class ? "class" : "non-class"), word_size, MaxMetaspaceSize / sizeof(MetaWord)); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| size_t MetaspaceGC::allowed_expansion() { |
| size_t committed_bytes = MetaspaceUtils::committed_bytes(); |
| size_t capacity_until_gc = capacity_until_GC(); |
| |
| assert(capacity_until_gc >= committed_bytes, |
| "capacity_until_gc: " SIZE_FORMAT " < committed_bytes: " SIZE_FORMAT, |
| capacity_until_gc, committed_bytes); |
| |
| size_t left_until_max = MaxMetaspaceSize - committed_bytes; |
| size_t left_until_GC = capacity_until_gc - committed_bytes; |
| size_t left_to_commit = MIN2(left_until_GC, left_until_max); |
| log_trace(gc, metaspace, freelist)("allowed expansion words: " SIZE_FORMAT |
| " (left_until_max: " SIZE_FORMAT ", left_until_GC: " SIZE_FORMAT ".", |
| left_to_commit / BytesPerWord, left_until_max / BytesPerWord, left_until_GC / BytesPerWord); |
| |
| return left_to_commit / BytesPerWord; |
| } |
| |
| void MetaspaceGC::compute_new_size() { |
| assert(_shrink_factor <= 100, "invalid shrink factor"); |
| uint current_shrink_factor = _shrink_factor; |
| _shrink_factor = 0; |
| |
| // Using committed_bytes() for used_after_gc is an overestimation, since the |
| // chunk free lists are included in committed_bytes() and the memory in an |
| // un-fragmented chunk free list is available for future allocations. |
| // However, if the chunk free lists becomes fragmented, then the memory may |
| // not be available for future allocations and the memory is therefore "in use". |
| // Including the chunk free lists in the definition of "in use" is therefore |
| // necessary. Not including the chunk free lists can cause capacity_until_GC to |
| // shrink below committed_bytes() and this has caused serious bugs in the past. |
| const size_t used_after_gc = MetaspaceUtils::committed_bytes(); |
| const size_t capacity_until_GC = MetaspaceGC::capacity_until_GC(); |
| |
| const double minimum_free_percentage = MinMetaspaceFreeRatio / 100.0; |
| const double maximum_used_percentage = 1.0 - minimum_free_percentage; |
| |
| const double min_tmp = used_after_gc / maximum_used_percentage; |
| size_t minimum_desired_capacity = |
| (size_t)MIN2(min_tmp, double(max_uintx)); |
| // Don't shrink less than the initial generation size |
| minimum_desired_capacity = MAX2(minimum_desired_capacity, |
| MetaspaceSize); |
| |
| log_trace(gc, metaspace)("MetaspaceGC::compute_new_size: "); |
| log_trace(gc, metaspace)(" minimum_free_percentage: %6.2f maximum_used_percentage: %6.2f", |
| minimum_free_percentage, maximum_used_percentage); |
| log_trace(gc, metaspace)(" used_after_gc : %6.1fKB", used_after_gc / (double) K); |
| |
| |
| size_t shrink_bytes = 0; |
| if (capacity_until_GC < minimum_desired_capacity) { |
| // If we have less capacity below the metaspace HWM, then |
| // increment the HWM. |
| size_t expand_bytes = minimum_desired_capacity - capacity_until_GC; |
| expand_bytes = align_up(expand_bytes, Metaspace::commit_alignment()); |
| // Don't expand unless it's significant |
| if (expand_bytes >= MinMetaspaceExpansion) { |
| size_t new_capacity_until_GC = 0; |
| bool succeeded = MetaspaceGC::inc_capacity_until_GC(expand_bytes, &new_capacity_until_GC); |
| assert(succeeded, "Should always succesfully increment HWM when at safepoint"); |
| |
| Metaspace::tracer()->report_gc_threshold(capacity_until_GC, |
| new_capacity_until_GC, |
| MetaspaceGCThresholdUpdater::ComputeNewSize); |
| log_trace(gc, metaspace)(" expanding: minimum_desired_capacity: %6.1fKB expand_bytes: %6.1fKB MinMetaspaceExpansion: %6.1fKB new metaspace HWM: %6.1fKB", |
| minimum_desired_capacity / (double) K, |
| expand_bytes / (double) K, |
| MinMetaspaceExpansion / (double) K, |
| new_capacity_until_GC / (double) K); |
| } |
| return; |
| } |
| |
| // No expansion, now see if we want to shrink |
| // We would never want to shrink more than this |
| assert(capacity_until_GC >= minimum_desired_capacity, |
| SIZE_FORMAT " >= " SIZE_FORMAT, |
| capacity_until_GC, minimum_desired_capacity); |
| size_t max_shrink_bytes = capacity_until_GC - minimum_desired_capacity; |
| |
| // Should shrinking be considered? |
| if (MaxMetaspaceFreeRatio < 100) { |
| const double maximum_free_percentage = MaxMetaspaceFreeRatio / 100.0; |
| const double minimum_used_percentage = 1.0 - maximum_free_percentage; |
| const double max_tmp = used_after_gc / minimum_used_percentage; |
| size_t maximum_desired_capacity = (size_t)MIN2(max_tmp, double(max_uintx)); |
| maximum_desired_capacity = MAX2(maximum_desired_capacity, |
| MetaspaceSize); |
| log_trace(gc, metaspace)(" maximum_free_percentage: %6.2f minimum_used_percentage: %6.2f", |
| maximum_free_percentage, minimum_used_percentage); |
| log_trace(gc, metaspace)(" minimum_desired_capacity: %6.1fKB maximum_desired_capacity: %6.1fKB", |
| minimum_desired_capacity / (double) K, maximum_desired_capacity / (double) K); |
| |
| assert(minimum_desired_capacity <= maximum_desired_capacity, |
| "sanity check"); |
| |
| if (capacity_until_GC > maximum_desired_capacity) { |
| // Capacity too large, compute shrinking size |
| shrink_bytes = capacity_until_GC - maximum_desired_capacity; |
| // We don't want shrink all the way back to initSize if people call |
| // System.gc(), because some programs do that between "phases" and then |
| // we'd just have to grow the heap up again for the next phase. So we |
| // damp the shrinking: 0% on the first call, 10% on the second call, 40% |
| // on the third call, and 100% by the fourth call. But if we recompute |
| // size without shrinking, it goes back to 0%. |
| shrink_bytes = shrink_bytes / 100 * current_shrink_factor; |
| |
| shrink_bytes = align_down(shrink_bytes, Metaspace::commit_alignment()); |
| |
| assert(shrink_bytes <= max_shrink_bytes, |
| "invalid shrink size " SIZE_FORMAT " not <= " SIZE_FORMAT, |
| shrink_bytes, max_shrink_bytes); |
| if (current_shrink_factor == 0) { |
| _shrink_factor = 10; |
| } else { |
| _shrink_factor = MIN2(current_shrink_factor * 4, (uint) 100); |
| } |
| log_trace(gc, metaspace)(" shrinking: initThreshold: %.1fK maximum_desired_capacity: %.1fK", |
| MetaspaceSize / (double) K, maximum_desired_capacity / (double) K); |
| log_trace(gc, metaspace)(" shrink_bytes: %.1fK current_shrink_factor: %d new shrink factor: %d MinMetaspaceExpansion: %.1fK", |
| shrink_bytes / (double) K, current_shrink_factor, _shrink_factor, MinMetaspaceExpansion / (double) K); |
| } |
| } |
| |
| // Don't shrink unless it's significant |
| if (shrink_bytes >= MinMetaspaceExpansion && |
| ((capacity_until_GC - shrink_bytes) >= MetaspaceSize)) { |
| size_t new_capacity_until_GC = MetaspaceGC::dec_capacity_until_GC(shrink_bytes); |
| Metaspace::tracer()->report_gc_threshold(capacity_until_GC, |
| new_capacity_until_GC, |
| MetaspaceGCThresholdUpdater::ComputeNewSize); |
| } |
| } |
| |
| // MetaspaceUtils |
| size_t MetaspaceUtils::_capacity_words [Metaspace:: MetadataTypeCount] = {0, 0}; |
| size_t MetaspaceUtils::_overhead_words [Metaspace:: MetadataTypeCount] = {0, 0}; |
| volatile size_t MetaspaceUtils::_used_words [Metaspace:: MetadataTypeCount] = {0, 0}; |
| |
| // Collect used metaspace statistics. This involves walking the CLDG. The resulting |
| // output will be the accumulated values for all live metaspaces. |
| // Note: method does not do any locking. |
| void MetaspaceUtils::collect_statistics(ClassLoaderMetaspaceStatistics* out) { |
| out->reset(); |
| ClassLoaderDataGraphMetaspaceIterator iter; |
| while (iter.repeat()) { |
| ClassLoaderMetaspace* msp = iter.get_next(); |
| if (msp != NULL) { |
| msp->add_to_statistics(out); |
| } |
| } |
| } |
| |
| size_t MetaspaceUtils::free_in_vs_bytes(Metaspace::MetadataType mdtype) { |
| VirtualSpaceList* list = Metaspace::get_space_list(mdtype); |
| return list == NULL ? 0 : list->free_bytes(); |
| } |
| |
| size_t MetaspaceUtils::free_in_vs_bytes() { |
| return free_in_vs_bytes(Metaspace::ClassType) + free_in_vs_bytes(Metaspace::NonClassType); |
| } |
| |
| static void inc_stat_nonatomically(size_t* pstat, size_t words) { |
| assert_lock_strong(MetaspaceExpand_lock); |
| (*pstat) += words; |
| } |
| |
| static void dec_stat_nonatomically(size_t* pstat, size_t words) { |
| assert_lock_strong(MetaspaceExpand_lock); |
| const size_t size_now = *pstat; |
| assert(size_now >= words, "About to decrement counter below zero " |
| "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".", |
| size_now, words); |
| *pstat = size_now - words; |
| } |
| |
| static void inc_stat_atomically(volatile size_t* pstat, size_t words) { |
| Atomic::add(words, pstat); |
| } |
| |
| static void dec_stat_atomically(volatile size_t* pstat, size_t words) { |
| const size_t size_now = *pstat; |
| assert(size_now >= words, "About to decrement counter below zero " |
| "(current value: " SIZE_FORMAT ", decrement value: " SIZE_FORMAT ".", |
| size_now, words); |
| Atomic::sub(words, pstat); |
| } |
| |
| void MetaspaceUtils::dec_capacity(Metaspace::MetadataType mdtype, size_t words) { |
| dec_stat_nonatomically(&_capacity_words[mdtype], words); |
| } |
| void MetaspaceUtils::inc_capacity(Metaspace::MetadataType mdtype, size_t words) { |
| inc_stat_nonatomically(&_capacity_words[mdtype], words); |
| } |
| void MetaspaceUtils::dec_used(Metaspace::MetadataType mdtype, size_t words) { |
| dec_stat_atomically(&_used_words[mdtype], words); |
| } |
| void MetaspaceUtils::inc_used(Metaspace::MetadataType mdtype, size_t words) { |
| inc_stat_atomically(&_used_words[mdtype], words); |
| } |
| void MetaspaceUtils::dec_overhead(Metaspace::MetadataType mdtype, size_t words) { |
| dec_stat_nonatomically(&_overhead_words[mdtype], words); |
| } |
| void MetaspaceUtils::inc_overhead(Metaspace::MetadataType mdtype, size_t words) { |
| inc_stat_nonatomically(&_overhead_words[mdtype], words); |
| } |
| |
| size_t MetaspaceUtils::reserved_bytes(Metaspace::MetadataType mdtype) { |
| VirtualSpaceList* list = Metaspace::get_space_list(mdtype); |
| return list == NULL ? 0 : list->reserved_bytes(); |
| } |
| |
| size_t MetaspaceUtils::committed_bytes(Metaspace::MetadataType mdtype) { |
| VirtualSpaceList* list = Metaspace::get_space_list(mdtype); |
| return list == NULL ? 0 : list->committed_bytes(); |
| } |
| |
| size_t MetaspaceUtils::min_chunk_size_words() { return Metaspace::first_chunk_word_size(); } |
| |
| size_t MetaspaceUtils::free_chunks_total_words(Metaspace::MetadataType mdtype) { |
| ChunkManager* chunk_manager = Metaspace::get_chunk_manager(mdtype); |
| if (chunk_manager == NULL) { |
| return 0; |
| } |
| chunk_manager->slow_verify(); |
| return chunk_manager->free_chunks_total_words(); |
| } |
| |
| size_t MetaspaceUtils::free_chunks_total_bytes(Metaspace::MetadataType mdtype) { |
| return free_chunks_total_words(mdtype) * BytesPerWord; |
| } |
| |
| size_t MetaspaceUtils::free_chunks_total_words() { |
| return free_chunks_total_words(Metaspace::ClassType) + |
| free_chunks_total_words(Metaspace::NonClassType); |
| } |
| |
| size_t MetaspaceUtils::free_chunks_total_bytes() { |
| return free_chunks_total_words() * BytesPerWord; |
| } |
| |
| bool MetaspaceUtils::has_chunk_free_list(Metaspace::MetadataType mdtype) { |
| return Metaspace::get_chunk_manager(mdtype) != NULL; |
| } |
| |
| MetaspaceChunkFreeListSummary MetaspaceUtils::chunk_free_list_summary(Metaspace::MetadataType mdtype) { |
| if (!has_chunk_free_list(mdtype)) { |
| return MetaspaceChunkFreeListSummary(); |
| } |
| |
| const ChunkManager* cm = Metaspace::get_chunk_manager(mdtype); |
| return cm->chunk_free_list_summary(); |
| } |
| |
| void MetaspaceUtils::print_metaspace_change(size_t prev_metadata_used) { |
| log_info(gc, metaspace)("Metaspace: " SIZE_FORMAT "K->" SIZE_FORMAT "K(" SIZE_FORMAT "K)", |
| prev_metadata_used/K, used_bytes()/K, reserved_bytes()/K); |
| } |
| |
| void MetaspaceUtils::print_on(outputStream* out) { |
| Metaspace::MetadataType nct = Metaspace::NonClassType; |
| |
| out->print_cr(" Metaspace " |
| "used " SIZE_FORMAT "K, " |
| "capacity " SIZE_FORMAT "K, " |
| "committed " SIZE_FORMAT "K, " |
| "reserved " SIZE_FORMAT "K", |
| used_bytes()/K, |
| capacity_bytes()/K, |
| committed_bytes()/K, |
| reserved_bytes()/K); |
| |
| if (Metaspace::using_class_space()) { |
| Metaspace::MetadataType ct = Metaspace::ClassType; |
| out->print_cr(" class space " |
| "used " SIZE_FORMAT "K, " |
| "capacity " SIZE_FORMAT "K, " |
| "committed " SIZE_FORMAT "K, " |
| "reserved " SIZE_FORMAT "K", |
| used_bytes(ct)/K, |
| capacity_bytes(ct)/K, |
| committed_bytes(ct)/K, |
| reserved_bytes(ct)/K); |
| } |
| } |
| |
| |
| void MetaspaceUtils::print_vs(outputStream* out, size_t scale) { |
| const size_t reserved_nonclass_words = reserved_bytes(Metaspace::NonClassType) / sizeof(MetaWord); |
| const size_t committed_nonclass_words = committed_bytes(Metaspace::NonClassType) / sizeof(MetaWord); |
| { |
| if (Metaspace::using_class_space()) { |
| out->print(" Non-class space: "); |
| } |
| print_scaled_words(out, reserved_nonclass_words, scale, 7); |
| out->print(" reserved, "); |
| print_scaled_words_and_percentage(out, committed_nonclass_words, reserved_nonclass_words, scale, 7); |
| out->print_cr(" committed "); |
| |
| if (Metaspace::using_class_space()) { |
| const size_t reserved_class_words = reserved_bytes(Metaspace::ClassType) / sizeof(MetaWord); |
| const size_t committed_class_words = committed_bytes(Metaspace::ClassType) / sizeof(MetaWord); |
| out->print(" Class space: "); |
| print_scaled_words(out, reserved_class_words, scale, 7); |
| out->print(" reserved, "); |
| print_scaled_words_and_percentage(out, committed_class_words, reserved_class_words, scale, 7); |
| out->print_cr(" committed "); |
| |
| const size_t reserved_words = reserved_nonclass_words + reserved_class_words; |
| const size_t committed_words = committed_nonclass_words + committed_class_words; |
| out->print(" Both: "); |
| print_scaled_words(out, reserved_words, scale, 7); |
| out->print(" reserved, "); |
| print_scaled_words_and_percentage(out, committed_words, reserved_words, scale, 7); |
| out->print_cr(" committed "); |
| } |
| } |
| } |
| |
| // This will print out a basic metaspace usage report but |
| // unlike print_report() is guaranteed not to lock or to walk the CLDG. |
| void MetaspaceUtils::print_basic_report(outputStream* out, size_t scale) { |
| |
| out->cr(); |
| out->print_cr("Usage:"); |
| |
| if (Metaspace::using_class_space()) { |
| out->print(" Non-class: "); |
| } |
| |
| // In its most basic form, we do not require walking the CLDG. Instead, just print the running totals from |
| // MetaspaceUtils. |
| const size_t cap_nc = MetaspaceUtils::capacity_words(Metaspace::NonClassType); |
| const size_t overhead_nc = MetaspaceUtils::overhead_words(Metaspace::NonClassType); |
| const size_t used_nc = MetaspaceUtils::used_words(Metaspace::NonClassType); |
| const size_t free_and_waste_nc = cap_nc - overhead_nc - used_nc; |
| |
| print_scaled_words(out, cap_nc, scale, 5); |
| out->print(" capacity, "); |
| print_scaled_words_and_percentage(out, used_nc, cap_nc, scale, 5); |
| out->print(" used, "); |
| print_scaled_words_and_percentage(out, free_and_waste_nc, cap_nc, scale, 5); |
| out->print(" free+waste, "); |
| print_scaled_words_and_percentage(out, overhead_nc, cap_nc, scale, 5); |
| out->print(" overhead. "); |
| out->cr(); |
| |
| if (Metaspace::using_class_space()) { |
| const size_t cap_c = MetaspaceUtils::capacity_words(Metaspace::ClassType); |
| const size_t overhead_c = MetaspaceUtils::overhead_words(Metaspace::ClassType); |
| const size_t used_c = MetaspaceUtils::used_words(Metaspace::ClassType); |
| const size_t free_and_waste_c = cap_c - overhead_c - used_c; |
| out->print(" Class: "); |
| print_scaled_words(out, cap_c, scale, 5); |
| out->print(" capacity, "); |
| print_scaled_words_and_percentage(out, used_c, cap_c, scale, 5); |
| out->print(" used, "); |
| print_scaled_words_and_percentage(out, free_and_waste_c, cap_c, scale, 5); |
| out->print(" free+waste, "); |
| print_scaled_words_and_percentage(out, overhead_c, cap_c, scale, 5); |
| out->print(" overhead. "); |
| out->cr(); |
| |
| out->print(" Both: "); |
| const size_t cap = cap_nc + cap_c; |
| |
| print_scaled_words(out, cap, scale, 5); |
| out->print(" capacity, "); |
| print_scaled_words_and_percentage(out, used_nc + used_c, cap, scale, 5); |
| out->print(" used, "); |
| print_scaled_words_and_percentage(out, free_and_waste_nc + free_and_waste_c, cap, scale, 5); |
| out->print(" free+waste, "); |
| print_scaled_words_and_percentage(out, overhead_nc + overhead_c, cap, scale, 5); |
| out->print(" overhead. "); |
| out->cr(); |
| } |
| |
| out->cr(); |
| out->print_cr("Virtual space:"); |
| |
| print_vs(out, scale); |
| |
| out->cr(); |
| out->print_cr("Chunk freelists:"); |
| |
| if (Metaspace::using_class_space()) { |
| out->print(" Non-Class: "); |
| } |
| print_human_readable_size(out, Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale); |
| out->cr(); |
| if (Metaspace::using_class_space()) { |
| out->print(" Class: "); |
| print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words(), scale); |
| out->cr(); |
| out->print(" Both: "); |
| print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_words() + |
| Metaspace::chunk_manager_metadata()->free_chunks_total_words(), scale); |
| out->cr(); |
| } |
| out->cr(); |
| |
| } |
| |
| void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) { |
| |
| const bool print_loaders = (flags & rf_show_loaders) > 0; |
| const bool print_classes = (flags & rf_show_classes) > 0; |
| const bool print_by_chunktype = (flags & rf_break_down_by_chunktype) > 0; |
| const bool print_by_spacetype = (flags & rf_break_down_by_spacetype) > 0; |
| |
| // Some report options require walking the class loader data graph. |
| PrintCLDMetaspaceInfoClosure cl(out, scale, print_loaders, print_classes, print_by_chunktype); |
| if (print_loaders) { |
| out->cr(); |
| out->print_cr("Usage per loader:"); |
| out->cr(); |
| } |
| |
| ClassLoaderDataGraph::cld_do(&cl); // collect data and optionally print |
| |
| // Print totals, broken up by space type. |
| if (print_by_spacetype) { |
| out->cr(); |
| out->print_cr("Usage per space type:"); |
| out->cr(); |
| for (int space_type = (int)Metaspace::ZeroMetaspaceType; |
| space_type < (int)Metaspace::MetaspaceTypeCount; space_type ++) |
| { |
| uintx num = cl._num_loaders_by_spacetype[space_type]; |
| out->print("%s (" UINTX_FORMAT " loader%s)%c", |
| space_type_name((Metaspace::MetaspaceType)space_type), |
| num, (num == 1 ? "" : "s"), (num > 0 ? ':' : '.')); |
| if (num > 0) { |
| cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype); |
| } |
| out->cr(); |
| } |
| } |
| |
| // Print totals for in-use data: |
| out->cr(); |
| out->print_cr("Total Usage ( " UINTX_FORMAT " loader%s)%c", |
| cl._num_loaders, (cl._num_loaders == 1 ? "" : "s"), (cl._num_loaders > 0 ? ':' : '.')); |
| |
| cl._stats_total.print_on(out, scale, print_by_chunktype); |
| |
| // -- Print Virtual space. |
| out->cr(); |
| out->print_cr("Virtual space:"); |
| |
| print_vs(out, scale); |
| |
| // -- Print VirtualSpaceList details. |
| if ((flags & rf_show_vslist) > 0) { |
| out->cr(); |
| out->print_cr("Virtual space list%s:", Metaspace::using_class_space() ? "s" : ""); |
| |
| if (Metaspace::using_class_space()) { |
| out->print_cr(" Non-Class:"); |
| } |
| Metaspace::space_list()->print_on(out, scale); |
| if (Metaspace::using_class_space()) { |
| out->print_cr(" Class:"); |
| Metaspace::class_space_list()->print_on(out, scale); |
| } |
| } |
| out->cr(); |
| |
| // -- Print VirtualSpaceList map. |
| if ((flags & rf_show_vsmap) > 0) { |
| out->cr(); |
| out->print_cr("Virtual space map:"); |
| |
| if (Metaspace::using_class_space()) { |
| out->print_cr(" Non-Class:"); |
| } |
| Metaspace::space_list()->print_map(out); |
| if (Metaspace::using_class_space()) { |
| out->print_cr(" Class:"); |
| Metaspace::class_space_list()->print_map(out); |
| } |
| } |
| out->cr(); |
| |
| // -- Print Freelists (ChunkManager) details |
| out->cr(); |
| out->print_cr("Chunk freelist%s:", Metaspace::using_class_space() ? "s" : ""); |
| |
| ChunkManagerStatistics non_class_cm_stat; |
| Metaspace::chunk_manager_metadata()->collect_statistics(&non_class_cm_stat); |
| |
| if (Metaspace::using_class_space()) { |
| out->print_cr(" Non-Class:"); |
| } |
| non_class_cm_stat.print_on(out, scale); |
| |
| if (Metaspace::using_class_space()) { |
| ChunkManagerStatistics class_cm_stat; |
| Metaspace::chunk_manager_class()->collect_statistics(&class_cm_stat); |
| out->print_cr(" Class:"); |
| class_cm_stat.print_on(out, scale); |
| } |
| |
| // As a convenience, print a summary of common waste. |
| out->cr(); |
| out->print("Waste "); |
| // For all wastages, print percentages from total. As total use the total size of memory committed for metaspace. |
| const size_t committed_words = committed_bytes() / BytesPerWord; |
| |
| out->print("(percentages refer to total committed size "); |
| print_scaled_words(out, committed_words, scale); |
| out->print_cr("):"); |
| |
| // Print space committed but not yet used by any class loader |
| const size_t unused_words_in_vs = MetaspaceUtils::free_in_vs_bytes() / BytesPerWord; |
| out->print(" Committed unused: "); |
| print_scaled_words_and_percentage(out, unused_words_in_vs, committed_words, scale, 6); |
| out->cr(); |
| |
| // Print waste for in-use chunks. |
| UsedChunksStatistics ucs_nonclass = cl._stats_total.nonclass_sm_stats().totals(); |
| UsedChunksStatistics ucs_class = cl._stats_total.class_sm_stats().totals(); |
| UsedChunksStatistics ucs_all; |
| ucs_all.add(ucs_nonclass); |
| ucs_all.add(ucs_class); |
| |
| out->print(" Waste in chunks in use: "); |
| print_scaled_words_and_percentage(out, ucs_all.waste(), committed_words, scale, 6); |
| out->cr(); |
| out->print(" Free in chunks in use: "); |
| print_scaled_words_and_percentage(out, ucs_all.free(), committed_words, scale, 6); |
| out->cr(); |
| out->print(" Overhead in chunks in use: "); |
| print_scaled_words_and_percentage(out, ucs_all.overhead(), committed_words, scale, 6); |
| out->cr(); |
| |
| // Print waste in free chunks. |
| const size_t total_capacity_in_free_chunks = |
| Metaspace::chunk_manager_metadata()->free_chunks_total_words() + |
| (Metaspace::using_class_space() ? Metaspace::chunk_manager_class()->free_chunks_total_words() : 0); |
| out->print(" In free chunks: "); |
| print_scaled_words_and_percentage(out, total_capacity_in_free_chunks, committed_words, scale, 6); |
| out->cr(); |
| |
| // Print waste in deallocated blocks. |
| const uintx free_blocks_num = |
| cl._stats_total.nonclass_sm_stats().free_blocks_num() + |
| cl._stats_total.class_sm_stats().free_blocks_num(); |
| const size_t free_blocks_cap_words = |
| cl._stats_total.nonclass_sm_stats().free_blocks_cap_words() + |
| cl._stats_total.class_sm_stats().free_blocks_cap_words(); |
| out->print("Deallocated from chunks in use: "); |
| print_scaled_words_and_percentage(out, free_blocks_cap_words, committed_words, scale, 6); |
| out->print(" (" UINTX_FORMAT " blocks)", free_blocks_num); |
| out->cr(); |
| |
| // Print total waste. |
| const size_t total_waste = ucs_all.waste() + ucs_all.free() + ucs_all.overhead() + total_capacity_in_free_chunks |
| + free_blocks_cap_words + unused_words_in_vs; |
| out->print(" -total-: "); |
| print_scaled_words_and_percentage(out, total_waste, committed_words, scale, 6); |
| out->cr(); |
| |
| // Print internal statistics |
| #ifdef ASSERT |
| out->cr(); |
| out->cr(); |
| out->print_cr("Internal statistics:"); |
| out->cr(); |
| out->print_cr("Number of allocations: " UINTX_FORMAT ".", g_internal_statistics.num_allocs); |
| out->print_cr("Number of space births: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_births); |
| out->print_cr("Number of space deaths: " UINTX_FORMAT ".", g_internal_statistics.num_metaspace_deaths); |
| out->print_cr("Number of virtual space node births: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_created); |
| out->print_cr("Number of virtual space node deaths: " UINTX_FORMAT ".", g_internal_statistics.num_vsnodes_purged); |
| out->print_cr("Number of times virtual space nodes were expanded: " UINTX_FORMAT ".", g_internal_statistics.num_committed_space_expanded); |
| out->print_cr("Number of deallocations: " UINTX_FORMAT " (" UINTX_FORMAT " external).", g_internal_statistics.num_deallocs, g_internal_statistics.num_external_deallocs); |
| out->print_cr("Allocations from deallocated blocks: " UINTX_FORMAT ".", g_internal_statistics.num_allocs_from_deallocated_blocks); |
| out->cr(); |
| #endif |
| |
| // Print some interesting settings |
| out->cr(); |
| out->cr(); |
| out->print("MaxMetaspaceSize: "); |
| print_human_readable_size(out, MaxMetaspaceSize, scale); |
| out->cr(); |
| out->print("InitialBootClassLoaderMetaspaceSize: "); |
| print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, scale); |
| out->cr(); |
| |
| out->print("UseCompressedClassPointers: %s", UseCompressedClassPointers ? "true" : "false"); |
| out->cr(); |
| if (Metaspace::using_class_space()) { |
| out->print("CompressedClassSpaceSize: "); |
| print_human_readable_size(out, CompressedClassSpaceSize, scale); |
| } |
| |
| out->cr(); |
| out->cr(); |
| |
| } // MetaspaceUtils::print_report() |
| |
| // Prints an ASCII representation of the given space. |
| void MetaspaceUtils::print_metaspace_map(outputStream* out, Metaspace::MetadataType mdtype) { |
| MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag); |
| const bool for_class = mdtype == Metaspace::ClassType ? true : false; |
| VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list(); |
| if (vsl != NULL) { |
| if (for_class) { |
| if (!Metaspace::using_class_space()) { |
| out->print_cr("No Class Space."); |
| return; |
| } |
| out->print_raw("---- Metaspace Map (Class Space) ----"); |
| } else { |
| out->print_raw("---- Metaspace Map (Non-Class Space) ----"); |
| } |
| // Print legend: |
| out->cr(); |
| out->print_cr("Chunk Types (uppercase chunks are in use): x-specialized, s-small, m-medium, h-humongous."); |
| out->cr(); |
| VirtualSpaceList* const vsl = for_class ? Metaspace::class_space_list() : Metaspace::space_list(); |
| vsl->print_map(out); |
| out->cr(); |
| } |
| } |
| |
| void MetaspaceUtils::verify_free_chunks() { |
| Metaspace::chunk_manager_metadata()->verify(); |
| if (Metaspace::using_class_space()) { |
| Metaspace::chunk_manager_class()->verify(); |
| } |
| } |
| |
| void MetaspaceUtils::verify_metrics() { |
| #ifdef ASSERT |
| // Please note: there are time windows where the internal counters are out of sync with |
| // reality. For example, when a newly created ClassLoaderMetaspace creates its first chunk - |
| // the ClassLoaderMetaspace is not yet attached to its ClassLoaderData object and hence will |
| // not be counted when iterating the CLDG. So be careful when you call this method. |
| ClassLoaderMetaspaceStatistics total_stat; |
| collect_statistics(&total_stat); |
| UsedChunksStatistics nonclass_chunk_stat = total_stat.nonclass_sm_stats().totals(); |
| UsedChunksStatistics class_chunk_stat = total_stat.class_sm_stats().totals(); |
| |
| bool mismatch = false; |
| for (int i = 0; i < Metaspace::MetadataTypeCount; i ++) { |
| Metaspace::MetadataType mdtype = (Metaspace::MetadataType)i; |
| UsedChunksStatistics chunk_stat = total_stat.sm_stats(mdtype).totals(); |
| if (capacity_words(mdtype) != chunk_stat.cap() || |
| used_words(mdtype) != chunk_stat.used() || |
| overhead_words(mdtype) != chunk_stat.overhead()) { |
| mismatch = true; |
| tty->print_cr("MetaspaceUtils::verify_metrics: counter mismatch for mdtype=%u:", mdtype); |
| tty->print_cr("Expected cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".", |
| capacity_words(mdtype), used_words(mdtype), overhead_words(mdtype)); |
| tty->print_cr("Got cap " SIZE_FORMAT ", used " SIZE_FORMAT ", overhead " SIZE_FORMAT ".", |
| chunk_stat.cap(), chunk_stat.used(), chunk_stat.overhead()); |
| tty->flush(); |
| } |
| } |
| assert(mismatch == false, "MetaspaceUtils::verify_metrics: counter mismatch."); |
| #endif |
| } |
| |
| |
| // Metaspace methods |
| |
| size_t Metaspace::_first_chunk_word_size = 0; |
| size_t Metaspace::_first_class_chunk_word_size = 0; |
| |
| size_t Metaspace::_commit_alignment = 0; |
| size_t Metaspace::_reserve_alignment = 0; |
| |
| VirtualSpaceList* Metaspace::_space_list = NULL; |
| VirtualSpaceList* Metaspace::_class_space_list = NULL; |
| |
| ChunkManager* Metaspace::_chunk_manager_metadata = NULL; |
| ChunkManager* Metaspace::_chunk_manager_class = NULL; |
| |
| #define VIRTUALSPACEMULTIPLIER 2 |
| |
| #ifdef _LP64 |
| static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1); |
| |
| void Metaspace::set_narrow_klass_base_and_shift(address metaspace_base, address cds_base) { |
| assert(!DumpSharedSpaces, "narrow_klass is set by MetaspaceShared class."); |
| // Figure out the narrow_klass_base and the narrow_klass_shift. The |
| // narrow_klass_base is the lower of the metaspace base and the cds base |
| // (if cds is enabled). The narrow_klass_shift depends on the distance |
| // between the lower base and higher address. |
| address lower_base; |
| address higher_address; |
| #if INCLUDE_CDS |
| if (UseSharedSpaces) { |
| higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()), |
| (address)(metaspace_base + compressed_class_space_size())); |
| lower_base = MIN2(metaspace_base, cds_base); |
| } else |
| #endif |
| { |
| higher_address = metaspace_base + compressed_class_space_size(); |
| lower_base = metaspace_base; |
| |
| uint64_t klass_encoding_max = UnscaledClassSpaceMax << LogKlassAlignmentInBytes; |
| // If compressed class space fits in lower 32G, we don't need a base. |
| if (higher_address <= (address)klass_encoding_max) { |
| lower_base = 0; // Effectively lower base is zero. |
| } |
| } |
| |
| Universe::set_narrow_klass_base(lower_base); |
| |
| // CDS uses LogKlassAlignmentInBytes for narrow_klass_shift. See |
| // MetaspaceShared::initialize_dumptime_shared_and_meta_spaces() for |
| // how dump time narrow_klass_shift is set. Although, CDS can work |
| // with zero-shift mode also, to be consistent with AOT it uses |
| // LogKlassAlignmentInBytes for klass shift so archived java heap objects |
| // can be used at same time as AOT code. |
| if (!UseSharedSpaces |
| && (uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax) { |
| Universe::set_narrow_klass_shift(0); |
| } else { |
| Universe::set_narrow_klass_shift(LogKlassAlignmentInBytes); |
| } |
| AOTLoader::set_narrow_klass_shift(); |
| } |
| |
| #if INCLUDE_CDS |
| // Return TRUE if the specified metaspace_base and cds_base are close enough |
| // to work with compressed klass pointers. |
| bool Metaspace::can_use_cds_with_metaspace_addr(char* metaspace_base, address cds_base) { |
| assert(cds_base != 0 && UseSharedSpaces, "Only use with CDS"); |
| assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs"); |
| address lower_base = MIN2((address)metaspace_base, cds_base); |
| address higher_address = MAX2((address)(cds_base + MetaspaceShared::core_spaces_size()), |
| (address)(metaspace_base + compressed_class_space_size())); |
| return ((uint64_t)(higher_address - lower_base) <= UnscaledClassSpaceMax); |
| } |
| #endif |
| |
| // Try to allocate the metaspace at the requested addr. |
| void Metaspace::allocate_metaspace_compressed_klass_ptrs(char* requested_addr, address cds_base) { |
| assert(!DumpSharedSpaces, "compress klass space is allocated by MetaspaceShared class."); |
| assert(using_class_space(), "called improperly"); |
| assert(UseCompressedClassPointers, "Only use with CompressedKlassPtrs"); |
| assert(compressed_class_space_size() < KlassEncodingMetaspaceMax, |
| "Metaspace size is too big"); |
| assert_is_aligned(requested_addr, _reserve_alignment); |
| assert_is_aligned(cds_base, _reserve_alignment); |
| assert_is_aligned(compressed_class_space_size(), _reserve_alignment); |
| |
| // Don't use large pages for the class space. |
| bool large_pages = false; |
| |
| #if !(defined(AARCH64) || defined(AIX)) |
| ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, |
| large_pages, |
| requested_addr); |
| #else // AARCH64 |
| ReservedSpace metaspace_rs; |
| |
| // Our compressed klass pointers may fit nicely into the lower 32 |
| // bits. |
| if ((uint64_t)requested_addr + compressed_class_space_size() < 4*G) { |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, |
| large_pages, |
| requested_addr); |
| } |
| |
| if (! metaspace_rs.is_reserved()) { |
| // Aarch64: Try to align metaspace so that we can decode a compressed |
| // klass with a single MOVK instruction. We can do this iff the |
| // compressed class base is a multiple of 4G. |
| // Aix: Search for a place where we can find memory. If we need to load |
| // the base, 4G alignment is helpful, too. |
| size_t increment = AARCH64_ONLY(4*)G; |
| for (char *a = align_up(requested_addr, increment); |
| a < (char*)(1024*G); |
| a += increment) { |
| if (a == (char *)(32*G)) { |
| // Go faster from here on. Zero-based is no longer possible. |
| increment = 4*G; |
| } |
| |
| #if INCLUDE_CDS |
| if (UseSharedSpaces |
| && ! can_use_cds_with_metaspace_addr(a, cds_base)) { |
| // We failed to find an aligned base that will reach. Fall |
| // back to using our requested addr. |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, |
| large_pages, |
| requested_addr); |
| break; |
| } |
| #endif |
| |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, |
| large_pages, |
| a); |
| if (metaspace_rs.is_reserved()) |
| break; |
| } |
| } |
| |
| #endif // AARCH64 |
| |
| if (!metaspace_rs.is_reserved()) { |
| #if INCLUDE_CDS |
| if (UseSharedSpaces) { |
| size_t increment = align_up(1*G, _reserve_alignment); |
| |
| // Keep trying to allocate the metaspace, increasing the requested_addr |
| // by 1GB each time, until we reach an address that will no longer allow |
| // use of CDS with compressed klass pointers. |
| char *addr = requested_addr; |
| while (!metaspace_rs.is_reserved() && (addr + increment > addr) && |
| can_use_cds_with_metaspace_addr(addr + increment, cds_base)) { |
| addr = addr + increment; |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, large_pages, addr); |
| } |
| } |
| #endif |
| // If no successful allocation then try to allocate the space anywhere. If |
| // that fails then OOM doom. At this point we cannot try allocating the |
| // metaspace as if UseCompressedClassPointers is off because too much |
| // initialization has happened that depends on UseCompressedClassPointers. |
| // So, UseCompressedClassPointers cannot be turned off at this point. |
| if (!metaspace_rs.is_reserved()) { |
| metaspace_rs = ReservedSpace(compressed_class_space_size(), |
| _reserve_alignment, large_pages); |
| if (!metaspace_rs.is_reserved()) { |
| vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes", |
| compressed_class_space_size())); |
| } |
| } |
| } |
| |
| // If we got here then the metaspace got allocated. |
| MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass); |
| |
| #if INCLUDE_CDS |
| // Verify that we can use shared spaces. Otherwise, turn off CDS. |
| if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(metaspace_rs.base(), cds_base)) { |
| FileMapInfo::stop_sharing_and_unmap( |
| "Could not allocate metaspace at a compatible address"); |
| } |
| #endif |
| set_narrow_klass_base_and_shift((address)metaspace_rs.base(), |
| UseSharedSpaces ? (address)cds_base : 0); |
| |
| initialize_class_space(metaspace_rs); |
| |
| LogTarget(Trace, gc, metaspace) lt; |
| if (lt.is_enabled()) { |
| ResourceMark rm; |
| LogStream ls(lt); |
| print_compressed_class_space(&ls, requested_addr); |
| } |
| } |
| |
| void Metaspace::print_compressed_class_space(outputStream* st, const char* requested_addr) { |
| st->print_cr("Narrow klass base: " PTR_FORMAT ", Narrow klass shift: %d", |
| p2i(Universe::narrow_klass_base()), Universe::narrow_klass_shift()); |
| if (_class_space_list != NULL) { |
| address base = (address)_class_space_list->current_virtual_space()->bottom(); |
| st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT, |
| compressed_class_space_size(), p2i(base)); |
| if (requested_addr != 0) { |
| st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr)); |
| } |
| st->cr(); |
| } |
| } |
| |
| // For UseCompressedClassPointers the class space is reserved above the top of |
| // the Java heap. The argument passed in is at the base of the compressed space. |
| void Metaspace::initialize_class_space(ReservedSpace rs) { |
| // The reserved space size may be bigger because of alignment, esp with UseLargePages |
| assert(rs.size() >= CompressedClassSpaceSize, |
| SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize); |
| assert(using_class_space(), "Must be using class space"); |
| _class_space_list = new VirtualSpaceList(rs); |
| _chunk_manager_class = new ChunkManager(true/*is_class*/); |
| |
| if (!_class_space_list->initialization_succeeded()) { |
| vm_exit_during_initialization("Failed to setup compressed class space virtual space list."); |
| } |
| } |
| |
| #endif |
| |
| void Metaspace::ergo_initialize() { |
| if (DumpSharedSpaces) { |
| // Using large pages when dumping the shared archive is currently not implemented. |
| FLAG_SET_ERGO(bool, UseLargePagesInMetaspace, false); |
| } |
| |
| size_t page_size = os::vm_page_size(); |
| if (UseLargePages && UseLargePagesInMetaspace) { |
| page_size = os::large_page_size(); |
| } |
| |
| _commit_alignment = page_size; |
| _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity()); |
| |
| // Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will |
| // override if MaxMetaspaceSize was set on the command line or not. |
| // This information is needed later to conform to the specification of the |
| // java.lang.management.MemoryUsage API. |
| // |
| // Ideally, we would be able to set the default value of MaxMetaspaceSize in |
| // globals.hpp to the aligned value, but this is not possible, since the |
| // alignment depends on other flags being parsed. |
| MaxMetaspaceSize = align_down_bounded(MaxMetaspaceSize, _reserve_alignment); |
| |
| if (MetaspaceSize > MaxMetaspaceSize) { |
| MetaspaceSize = MaxMetaspaceSize; |
| } |
| |
| MetaspaceSize = align_down_bounded(MetaspaceSize, _commit_alignment); |
| |
| assert(MetaspaceSize <= MaxMetaspaceSize, "MetaspaceSize should be limited by MaxMetaspaceSize"); |
| |
| MinMetaspaceExpansion = align_down_bounded(MinMetaspaceExpansion, _commit_alignment); |
| MaxMetaspaceExpansion = align_down_bounded(MaxMetaspaceExpansion, _commit_alignment); |
| |
| CompressedClassSpaceSize = align_down_bounded(CompressedClassSpaceSize, _reserve_alignment); |
| |
| // Initial virtual space size will be calculated at global_initialize() |
| size_t min_metaspace_sz = |
| VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize; |
| if (UseCompressedClassPointers) { |
| if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) { |
| if (min_metaspace_sz >= MaxMetaspaceSize) { |
| vm_exit_during_initialization("MaxMetaspaceSize is too small."); |
| } else { |
| FLAG_SET_ERGO(size_t, CompressedClassSpaceSize, |
| MaxMetaspaceSize - min_metaspace_sz); |
| } |
| } |
| } else if (min_metaspace_sz >= MaxMetaspaceSize) { |
| FLAG_SET_ERGO(size_t, InitialBootClassLoaderMetaspaceSize, |
| min_metaspace_sz); |
| } |
| |
| set_compressed_class_space_size(CompressedClassSpaceSize); |
| } |
| |
| void Metaspace::global_initialize() { |
| MetaspaceGC::initialize(); |
| |
| #if INCLUDE_CDS |
| if (DumpSharedSpaces) { |
| MetaspaceShared::initialize_dumptime_shared_and_meta_spaces(); |
| } else if (UseSharedSpaces) { |
| // If any of the archived space fails to map, UseSharedSpaces |
| // is reset to false. Fall through to the |
| // (!DumpSharedSpaces && !UseSharedSpaces) case to set up class |
| // metaspace. |
| MetaspaceShared::initialize_runtime_shared_and_meta_spaces(); |
| } |
| |
| if (!DumpSharedSpaces && !UseSharedSpaces) |
| #endif // INCLUDE_CDS |
| { |
| #ifdef _LP64 |
| if (using_class_space()) { |
| char* base = (char*)align_up(Universe::heap()->reserved_region().end(), _reserve_alignment); |
| allocate_metaspace_compressed_klass_ptrs(base, 0); |
| } |
| #endif // _LP64 |
| } |
| |
| // Initialize these before initializing the VirtualSpaceList |
| _first_chunk_word_size = InitialBootClassLoaderMetaspaceSize / BytesPerWord; |
| _first_chunk_word_size = align_word_size_up(_first_chunk_word_size); |
| // Make the first class chunk bigger than a medium chunk so it's not put |
| // on the medium chunk list. The next chunk will be small and progress |
| // from there. This size calculated by -version. |
| _first_class_chunk_word_size = MIN2((size_t)MediumChunk*6, |
| (CompressedClassSpaceSize/BytesPerWord)*2); |
| _first_class_chunk_word_size = align_word_size_up(_first_class_chunk_word_size); |
| // Arbitrarily set the initial virtual space to a multiple |
| // of the boot class loader size. |
| size_t word_size = VIRTUALSPACEMULTIPLIER * _first_chunk_word_size; |
| word_size = align_up(word_size, Metaspace::reserve_alignment_words()); |
| |
| // Initialize the list of virtual spaces. |
| _space_list = new VirtualSpaceList(word_size); |
| _chunk_manager_metadata = new ChunkManager(false/*metaspace*/); |
| |
| if (!_space_list->initialization_succeeded()) { |
| vm_exit_during_initialization("Unable to setup metadata virtual space list.", NULL); |
| } |
| |
| _tracer = new MetaspaceTracer(); |
| } |
| |
| void Metaspace::post_initialize() { |
| MetaspaceGC::post_initialize(); |
| } |
| |
| void Metaspace::verify_global_initialization() { |
| assert(space_list() != NULL, "Metadata VirtualSpaceList has not been initialized"); |
| assert(chunk_manager_metadata() != NULL, "Metadata ChunkManager has not been initialized"); |
| |
| if (using_class_space()) { |
| assert(class_space_list() != NULL, "Class VirtualSpaceList has not been initialized"); |
| assert(chunk_manager_class() != NULL, "Class ChunkManager has not been initialized"); |
| } |
| } |
| |
| size_t Metaspace::align_word_size_up(size_t word_size) { |
| size_t byte_size = word_size * wordSize; |
| return ReservedSpace::allocation_align_size_up(byte_size) / wordSize; |
| } |
| |
| MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size, |
| MetaspaceObj::Type type, TRAPS) { |
| assert(!_frozen, "sanity"); |
| if (HAS_PENDING_EXCEPTION) { |
| assert(false, "Should not allocate with exception pending"); |
| return NULL; // caller does a CHECK_NULL too |
| } |
| |
| assert(loader_data != NULL, "Should never pass around a NULL loader_data. " |
| "ClassLoaderData::the_null_class_loader_data() should have been used."); |
| |
| MetadataType mdtype = (type == MetaspaceObj::ClassType) ? ClassType : NonClassType; |
| |
| // Try to allocate metadata. |
| MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype); |
| |
| if (result == NULL) { |
| tracer()->report_metaspace_allocation_failure(loader_data, word_size, type, mdtype); |
| |
| // Allocation failed. |
| if (is_init_completed() && !(DumpSharedSpaces && THREAD->is_VM_thread())) { |
| // Only start a GC if the bootstrapping has completed. |
| // Also, we cannot GC if we are at the end of the CDS dumping stage which runs inside |
| // the VM thread. |
| |
| // Try to clean out some memory and retry. |
| result = Universe::heap()->satisfy_failed_metadata_allocation(loader_data, word_size, mdtype); |
| } |
| } |
| |
| if (result == NULL) { |
| if (DumpSharedSpaces) { |
| // CDS dumping keeps loading classes, so if we hit an OOM we probably will keep hitting OOM. |
| // We should abort to avoid generating a potentially bad archive. |
| tty->print_cr("Failed allocating metaspace object type %s of size " SIZE_FORMAT ". CDS dump aborted.", |
| MetaspaceObj::type_name(type), word_size * BytesPerWord); |
| tty->print_cr("Please increase MaxMetaspaceSize (currently " SIZE_FORMAT " bytes).", MaxMetaspaceSize); |
| vm_exit(1); |
| } |
| report_metadata_oome(loader_data, word_size, type, mdtype, THREAD); |
| assert(HAS_PENDING_EXCEPTION, "sanity"); |
| return NULL; |
| } |
| |
| // Zero initialize. |
| Copy::fill_to_words((HeapWord*)result, word_size, 0); |
| |
| return result; |
| } |
| |
| void Metaspace::report_metadata_oome(ClassLoaderData* loader_data, size_t word_size, MetaspaceObj::Type type, MetadataType mdtype, TRAPS) { |
| tracer()->report_metadata_oom(loader_data, word_size, type, mdtype); |
| |
| // If result is still null, we are out of memory. |
| Log(gc, metaspace, freelist, oom) log; |
| if (log.is_info()) { |
| log.info("Metaspace (%s) allocation failed for size " SIZE_FORMAT, |
| is_class_space_allocation(mdtype) ? "class" : "data", word_size); |
| ResourceMark rm; |
| if (log.is_debug()) { |
| if (loader_data->metaspace_or_null() != NULL) { |
| LogStream ls(log.debug()); |
| loader_data->print_value_on(&ls); |
| } |
| } |
| LogStream ls(log.info()); |
| // In case of an OOM, log out a short but still useful report. |
| MetaspaceUtils::print_basic_report(&ls, 0); |
| } |
| |
| bool out_of_compressed_class_space = false; |
| if (is_class_space_allocation(mdtype)) { |
| ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null(); |
| out_of_compressed_class_space = |
| MetaspaceUtils::committed_bytes(Metaspace::ClassType) + |
| (metaspace->class_chunk_size(word_size) * BytesPerWord) > |
| CompressedClassSpaceSize; |
| } |
| |
| // -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support |
| const char* space_string = out_of_compressed_class_space ? |
| "Compressed class space" : "Metaspace"; |
| |
| report_java_out_of_memory(space_string); |
| |
| if (JvmtiExport::should_post_resource_exhausted()) { |
| JvmtiExport::post_resource_exhausted( |
| JVMTI_RESOURCE_EXHAUSTED_OOM_ERROR, |
| space_string); |
| } |
| |
| if (!is_init_completed()) { |
| vm_exit_during_initialization("OutOfMemoryError", space_string); |
| } |
| |
| if (out_of_compressed_class_space) { |
| THROW_OOP(Universe::out_of_memory_error_class_metaspace()); |
| } else { |
| THROW_OOP(Universe::out_of_memory_error_metaspace()); |
| } |
| } |
| |
| const char* Metaspace::metadata_type_name(Metaspace::MetadataType mdtype) { |
| switch (mdtype) { |
| case Metaspace::ClassType: return "Class"; |
| case Metaspace::NonClassType: return "Metadata"; |
| default: |
| assert(false, "Got bad mdtype: %d", (int) mdtype); |
| return NULL; |
| } |
| } |
| |
| void Metaspace::purge(MetadataType mdtype) { |
| get_space_list(mdtype)->purge(get_chunk_manager(mdtype)); |
| } |
| |
| void Metaspace::purge() { |
| MutexLockerEx cl(MetaspaceExpand_lock, |
| Mutex::_no_safepoint_check_flag); |
| purge(NonClassType); |
| if (using_class_space()) { |
| purge(ClassType); |
| } |
| } |
| |
| bool Metaspace::contains(const void* ptr) { |
| if (MetaspaceShared::is_in_shared_metaspace(ptr)) { |
| return true; |
| } |
| return contains_non_shared(ptr); |
| } |
| |
| bool Metaspace::contains_non_shared(const void* ptr) { |
| if (using_class_space() && get_space_list(ClassType)->contains(ptr)) { |
| return true; |
| } |
| |
| return get_space_list(NonClassType)->contains(ptr); |
| } |
| |
| // ClassLoaderMetaspace |
| |
| ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, Metaspace::MetaspaceType type) |
| : _space_type(type) |
| , _lock(lock) |
| , _vsm(NULL) |
| , _class_vsm(NULL) |
| { |
| initialize(lock, type); |
| } |
| |
| ClassLoaderMetaspace::~ClassLoaderMetaspace() { |
| DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_deaths)); |
| delete _vsm; |
| if (Metaspace::using_class_space()) { |
| delete _class_vsm; |
| } |
| } |
| |
| void ClassLoaderMetaspace::initialize_first_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) { |
| Metachunk* chunk = get_initialization_chunk(type, mdtype); |
| if (chunk != NULL) { |
| // Add to this manager's list of chunks in use and make it the current_chunk(). |
| get_space_manager(mdtype)->add_chunk(chunk, true); |
| } |
| } |
| |
| Metachunk* ClassLoaderMetaspace::get_initialization_chunk(Metaspace::MetaspaceType type, Metaspace::MetadataType mdtype) { |
| size_t chunk_word_size = get_space_manager(mdtype)->get_initial_chunk_size(type); |
| |
| // Get a chunk from the chunk freelist |
| Metachunk* chunk = Metaspace::get_chunk_manager(mdtype)->chunk_freelist_allocate(chunk_word_size); |
| |
| if (chunk == NULL) { |
| chunk = Metaspace::get_space_list(mdtype)->get_new_chunk(chunk_word_size, |
| get_space_manager(mdtype)->medium_chunk_bunch()); |
| } |
| |
| return chunk; |
| } |
| |
| void ClassLoaderMetaspace::initialize(Mutex* lock, Metaspace::MetaspaceType type) { |
| Metaspace::verify_global_initialization(); |
| |
| DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_metaspace_births)); |
| |
| // Allocate SpaceManager for metadata objects. |
| _vsm = new SpaceManager(Metaspace::NonClassType, type, lock); |
| |
| if (Metaspace::using_class_space()) { |
| // Allocate SpaceManager for classes. |
| _class_vsm = new SpaceManager(Metaspace::ClassType, type, lock); |
| } |
| |
| MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag); |
| |
| // Allocate chunk for metadata objects |
| initialize_first_chunk(type, Metaspace::NonClassType); |
| |
| // Allocate chunk for class metadata objects |
| if (Metaspace::using_class_space()) { |
| initialize_first_chunk(type, Metaspace::ClassType); |
| } |
| } |
| |
| MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, Metaspace::MetadataType mdtype) { |
| Metaspace::assert_not_frozen(); |
| |
| DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_allocs)); |
| |
| // Don't use class_vsm() unless UseCompressedClassPointers is true. |
| if (Metaspace::is_class_space_allocation(mdtype)) { |
| return class_vsm()->allocate(word_size); |
| } else { |
| return vsm()->allocate(word_size); |
| } |
| } |
| |
| MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, Metaspace::MetadataType mdtype) { |
| Metaspace::assert_not_frozen(); |
| size_t delta_bytes = MetaspaceGC::delta_capacity_until_GC(word_size * BytesPerWord); |
| assert(delta_bytes > 0, "Must be"); |
| |
| size_t before = 0; |
| size_t after = 0; |
| MetaWord* res; |
| bool incremented; |
| |
| // Each thread increments the HWM at most once. Even if the thread fails to increment |
| // the HWM, an allocation is still attempted. This is because another thread must then |
| // have incremented the HWM and therefore the allocation might still succeed. |
| do { |
| incremented = MetaspaceGC::inc_capacity_until_GC(delta_bytes, &after, &before); |
| res = allocate(word_size, mdtype); |
| } while (!incremented && res == NULL); |
| |
| if (incremented) { |
| Metaspace::tracer()->report_gc_threshold(before, after, |
| MetaspaceGCThresholdUpdater::ExpandAndAllocate); |
| log_trace(gc, metaspace)("Increase capacity to GC from " SIZE_FORMAT " to " SIZE_FORMAT, before, after); |
| } |
| |
| return res; |
| } |
| |
| size_t ClassLoaderMetaspace::allocated_blocks_bytes() const { |
| return (vsm()->used_words() + |
| (Metaspace::using_class_space() ? class_vsm()->used_words() : 0)) * BytesPerWord; |
| } |
| |
| size_t ClassLoaderMetaspace::allocated_chunks_bytes() const { |
| return (vsm()->capacity_words() + |
| (Metaspace::using_class_space() ? class_vsm()->capacity_words() : 0)) * BytesPerWord; |
| } |
| |
| void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) { |
| Metaspace::assert_not_frozen(); |
| assert(!SafepointSynchronize::is_at_safepoint() |
| || Thread::current()->is_VM_thread(), "should be the VM thread"); |
| |
| DEBUG_ONLY(Atomic::inc(&g_internal_statistics.num_external_deallocs)); |
| |
| MutexLockerEx ml(vsm()->lock(), Mutex::_no_safepoint_check_flag); |
| |
| if (is_class && Metaspace::using_class_space()) { |
| class_vsm()->deallocate(ptr, word_size); |
| } else { |
| vsm()->deallocate(ptr, word_size); |
| } |
| } |
| |
| size_t ClassLoaderMetaspace::class_chunk_size(size_t word_size) { |
| assert(Metaspace::using_class_space(), "Has to use class space"); |
| return class_vsm()->calc_chunk_size(word_size); |
| } |
| |
| void ClassLoaderMetaspace::print_on(outputStream* out) const { |
| // Print both class virtual space counts and metaspace. |
| if (Verbose) { |
| vsm()->print_on(out); |
| if (Metaspace::using_class_space()) { |
| class_vsm()->print_on(out); |
| } |
| } |
| } |
| |
| void ClassLoaderMetaspace::verify() { |
| vsm()->verify(); |
| if (Metaspace::using_class_space()) { |
| class_vsm()->verify(); |
| } |
| } |
| |
| void ClassLoaderMetaspace::add_to_statistics_locked(ClassLoaderMetaspaceStatistics* out) const { |
| assert_lock_strong(lock()); |
| vsm()->add_to_statistics_locked(&out->nonclass_sm_stats()); |
| if (Metaspace::using_class_space()) { |
| class_vsm()->add_to_statistics_locked(&out->class_sm_stats()); |
| } |
| } |
| |
| void ClassLoaderMetaspace::add_to_statistics(ClassLoaderMetaspaceStatistics* out) const { |
| MutexLockerEx cl(lock(), Mutex::_no_safepoint_check_flag); |
| add_to_statistics_locked(out); |
| } |
| |
| /////////////// Unit tests /////////////// |
| |
| #ifndef PRODUCT |
| |
| class TestMetaspaceUtilsTest : AllStatic { |
| public: |
| static void test_reserved() { |
| size_t reserved = MetaspaceUtils::reserved_bytes(); |
| |
| assert(reserved > 0, "assert"); |
| |
| size_t committed = MetaspaceUtils::committed_bytes(); |
| assert(committed <= reserved, "assert"); |
| |
| size_t reserved_metadata = MetaspaceUtils::reserved_bytes(Metaspace::NonClassType); |
| assert(reserved_metadata > 0, "assert"); |
| assert(reserved_metadata <= reserved, "assert"); |
| |
| if (UseCompressedClassPointers) { |
| size_t reserved_class = MetaspaceUtils::reserved_bytes(Metaspace::ClassType); |
| assert(reserved_class > 0, "assert"); |
| assert(reserved_class < reserved, "assert"); |
| } |
| } |
| |
| static void test_committed() { |
| size_t committed = MetaspaceUtils::committed_bytes(); |
| |
| assert(committed > 0, "assert"); |
| |
| size_t reserved = MetaspaceUtils::reserved_bytes(); |
| assert(committed <= reserved, "assert"); |
| |
| size_t committed_metadata = MetaspaceUtils::committed_bytes(Metaspace::NonClassType); |
| assert(committed_metadata > 0, "assert"); |
| assert(committed_metadata <= committed, "assert"); |
| |
| if (UseCompressedClassPointers) { |
| size_t committed_class = MetaspaceUtils::committed_bytes(Metaspace::ClassType); |
| assert(committed_class > 0, "assert"); |
| assert(committed_class < committed, "assert"); |
| } |
| } |
| |
| static void test_virtual_space_list_large_chunk() { |
| VirtualSpaceList* vs_list = new VirtualSpaceList(os::vm_allocation_granularity()); |
| MutexLockerEx cl(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag); |
| // A size larger than VirtualSpaceSize (256k) and add one page to make it _not_ be |
| // vm_allocation_granularity aligned on Windows. |
| size_t large_size = (size_t)(2*256*K + (os::vm_page_size()/BytesPerWord)); |
| large_size += (os::vm_page_size()/BytesPerWord); |
| vs_list->get_new_chunk(large_size, 0); |
| } |
| |
| static void test() { |
| test_reserved(); |
| test_committed(); |
| test_virtual_space_list_large_chunk(); |
| } |
| }; |
| |
| void TestMetaspaceUtils_test() { |
| TestMetaspaceUtilsTest::test(); |
| } |
| |
| class TestVirtualSpaceNodeTest { |
| static void chunk_up(size_t words_left, size_t& num_medium_chunks, |
| size_t& num_small_chunks, |
| size_t& num_specialized_chunks) { |
| num_medium_chunks = words_left / MediumChunk; |
| words_left = words_left % MediumChunk; |
| |
| num_small_chunks = words_left / SmallChunk; |
| words_left = words_left % SmallChunk; |
| // how many specialized chunks can we get? |
| num_specialized_chunks = words_left / SpecializedChunk; |
| assert(words_left % SpecializedChunk == 0, "should be nothing left"); |
| } |
| |
| public: |
| static void test() { |
| MutexLockerEx ml(MetaspaceExpand_lock, Mutex::_no_safepoint_check_flag); |
| const size_t vsn_test_size_words = MediumChunk * 4; |
| const size_t vsn_test_size_bytes = vsn_test_size_words * BytesPerWord; |
| |
| // The chunk sizes must be multiples of eachother, or this will fail |
| STATIC_ASSERT(MediumChunk % SmallChunk == 0); |
| STATIC_ASSERT(SmallChunk % SpecializedChunk == 0); |
| |
| { // No committed memory in VSN |
| ChunkManager cm(false); |
| VirtualSpaceNode vsn(false, vsn_test_size_bytes); |
| vsn.initialize(); |
| vsn.retire(&cm); |
| assert(cm.sum_free_chunks_count() == 0, "did not commit any memory in the VSN"); |
| } |
| |
| { // All of VSN is committed, half is used by chunks |
| ChunkManager cm(false); |
| VirtualSpaceNode vsn(false, vsn_test_size_bytes); |
| vsn.initialize(); |
| vsn.expand_by(vsn_test_size_words, vsn_test_size_words); |
| vsn.get_chunk_vs(MediumChunk); |
| vsn.get_chunk_vs(MediumChunk); |
| vsn.retire(&cm); |
| assert(cm.sum_free_chunks_count() == 2, "should have been memory left for 2 medium chunks"); |
| assert(cm.sum_free_chunks() == 2*MediumChunk, "sizes should add up"); |
| } |
| |
| const size_t page_chunks = 4 * (size_t)os::vm_page_size() / BytesPerWord; |
| // This doesn't work for systems with vm_page_size >= 16K. |
| if (page_chunks < MediumChunk) { |
| // 4 pages of VSN is committed, some is used by chunks |
| ChunkManager cm(false); |
| VirtualSpaceNode vsn(false, vsn_test_size_bytes); |
| |
| vsn.initialize(); |
| vsn.expand_by(page_chunks, page_chunks); |
| vsn.get_chunk_vs(SmallChunk); |
| vsn.get_chunk_vs(SpecializedChunk); |
| vsn.retire(&cm); |
| |
| // committed - used = words left to retire |
| const size_t words_left = page_chunks - SmallChunk - SpecializedChunk; |
| |
| size_t num_medium_chunks, num_small_chunks, num_spec_chunks; |
| chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks); |
| |
| assert(num_medium_chunks == 0, "should not get any medium chunks"); |
| assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks"); |
| assert(cm.sum_free_chunks() == words_left, "sizes should add up"); |
| } |
| |
| { // Half of VSN is committed, a humongous chunk is used |
| ChunkManager cm(false); |
| VirtualSpaceNode vsn(false, vsn_test_size_bytes); |
| vsn.initialize(); |
| vsn.expand_by(MediumChunk * 2, MediumChunk * 2); |
| vsn.get_chunk_vs(MediumChunk + SpecializedChunk); // Humongous chunks will be aligned up to MediumChunk + SpecializedChunk |
| vsn.retire(&cm); |
| |
| const size_t words_left = MediumChunk * 2 - (MediumChunk + SpecializedChunk); |
| size_t num_medium_chunks, num_small_chunks, num_spec_chunks; |
| chunk_up(words_left, num_medium_chunks, num_small_chunks, num_spec_chunks); |
| |
| assert(num_medium_chunks == 0, "should not get any medium chunks"); |
| assert(cm.sum_free_chunks_count() == (num_small_chunks + num_spec_chunks), "should be space for 3 chunks"); |
| assert(cm.sum_free_chunks() == words_left, "sizes should add up"); |
| } |
| |
| } |
| |
| #define assert_is_available_positive(word_size) \ |
| assert(vsn.is_available(word_size), \ |
| #word_size ": " PTR_FORMAT " bytes were not available in " \ |
| "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \ |
| (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end())); |
| |
| #define assert_is_available_negative(word_size) \ |
| assert(!vsn.is_available(word_size), \ |
| #word_size ": " PTR_FORMAT " bytes should not be available in " \ |
| "VirtualSpaceNode [" PTR_FORMAT ", " PTR_FORMAT ")", \ |
| (uintptr_t)(word_size * BytesPerWord), p2i(vsn.bottom()), p2i(vsn.end())); |
| |
| static void test_is_available_positive() { |
| // Reserve some memory. |
| VirtualSpaceNode vsn(false, os::vm_allocation_granularity()); |
| assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); |
| |
| // Commit some memory. |
| size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; |
| bool expanded = vsn.expand_by(commit_word_size, commit_word_size); |
| assert(expanded, "Failed to commit"); |
| |
| // Check that is_available accepts the committed size. |
| assert_is_available_positive(commit_word_size); |
| |
| // Check that is_available accepts half the committed size. |
| size_t expand_word_size = commit_word_size / 2; |
| assert_is_available_positive(expand_word_size); |
| } |
| |
| static void test_is_available_negative() { |
| // Reserve some memory. |
| VirtualSpaceNode vsn(false, os::vm_allocation_granularity()); |
| assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); |
| |
| // Commit some memory. |
| size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; |
| bool expanded = vsn.expand_by(commit_word_size, commit_word_size); |
| assert(expanded, "Failed to commit"); |
| |
| // Check that is_available doesn't accept a too large size. |
| size_t two_times_commit_word_size = commit_word_size * 2; |
| assert_is_available_negative(two_times_commit_word_size); |
| } |
| |
| static void test_is_available_overflow() { |
| // Reserve some memory. |
| VirtualSpaceNode vsn(false, os::vm_allocation_granularity()); |
| assert(vsn.initialize(), "Failed to setup VirtualSpaceNode"); |
| |
| // Commit some memory. |
| size_t commit_word_size = os::vm_allocation_granularity() / BytesPerWord; |
| bool expanded = vsn.expand_by(commit_word_size, commit_word_size); |
| assert(expanded, "Failed to commit"); |
| |
| // Calculate a size that will overflow the virtual space size. |
| void* virtual_space_max = (void*)(uintptr_t)-1; |
| size_t bottom_to_max = pointer_delta(virtual_space_max, vsn.bottom(), 1); |
| size_t overflow_size = bottom_to_max + BytesPerWord; |
| size_t overflow_word_size = overflow_size / BytesPerWord; |
| |
| // Check that is_available can handle the overflow. |
| assert_is_available_negative(overflow_word_size); |
| } |
| |
| static void test_is_available() { |
| TestVirtualSpaceNodeTest::test_is_available_positive(); |
| TestVirtualSpaceNodeTest::test_is_available_negative(); |
| TestVirtualSpaceNodeTest::test_is_available_overflow(); |
| } |
| }; |
| |
| #endif // !PRODUCT |
| |
| struct chunkmanager_statistics_t { |
| int num_specialized_chunks; |
| int num_small_chunks; |
| int num_medium_chunks; |
| int num_humongous_chunks; |
| }; |
| |
| extern void test_metaspace_retrieve_chunkmanager_statistics(Metaspace::MetadataType mdType, chunkmanager_statistics_t* out) { |
| ChunkManager* const chunk_manager = Metaspace::get_chunk_manager(mdType); |
| ChunkManagerStatistics stat; |
| chunk_manager->collect_statistics(&stat); |
| out->num_specialized_chunks = (int)stat.chunk_stats(SpecializedIndex).num(); |
| out->num_small_chunks = (int)stat.chunk_stats(SmallIndex).num(); |
| out->num_medium_chunks = (int)stat.chunk_stats(MediumIndex).num(); |
| out->num_humongous_chunks = (int)stat.chunk_stats(HumongousIndex).num(); |
| } |
| |
| struct chunk_geometry_t { |
| size_t specialized_chunk_word_size; |
| size_t small_chunk_word_size; |
| size_t medium_chunk_word_size; |
| }; |
| |
| extern void test_metaspace_retrieve_chunk_geometry(Metaspace::MetadataType mdType, chunk_geometry_t* out) { |
| if (mdType == Metaspace::NonClassType) { |
| out->specialized_chunk_word_size = SpecializedChunk; |
| out->small_chunk_word_size = SmallChunk; |
| out->medium_chunk_word_size = MediumChunk; |
| } else { |
| out->specialized_chunk_word_size = ClassSpecializedChunk; |
| out->small_chunk_word_size = ClassSmallChunk; |
| out->medium_chunk_word_size = ClassMediumChunk; |
| } |
| } |