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src/hotspot/share/memory/metaspace.cpp
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rev 60538 : imported patch jep387-all.patch
*** 21,87 ****
* questions.
*
*/
#include "precompiled.hpp"
#include "aot/aotLoader.hpp"
- #include "classfile/classLoaderDataGraph.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 "oops/compressedOops.hpp"
#include "runtime/atomic.hpp"
#include "runtime/init.hpp"
#include "services/memTracker.hpp"
#include "utilities/copy.hpp"
#include "utilities/debug.hpp"
#include "utilities/formatBuffer.hpp"
#include "utilities/globalDefinitions.hpp"
- #include "utilities/vmError.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::ClassMirrorHolderMetaspaceType: s = "ClassMirrorHolder"; break;
! case Metaspace::ReflectionMetaspaceType: s = "Reflection"; break;
! default: ShouldNotReachHere();
}
- return s;
}
! volatile size_t MetaspaceGC::_capacity_until_GC = 0;
! uint MetaspaceGC::_shrink_factor = 0;
! // 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
--- 21,214 ----
* 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/metaspaceShared.hpp"
+ #include "memory/metaspaceTracer.hpp"
+ #include "memory/metaspace/chunkHeaderPool.hpp"
#include "memory/metaspace/chunkManager.hpp"
! #include "memory/metaspace/commitLimiter.hpp"
#include "memory/metaspace/metaspaceCommon.hpp"
! #include "memory/metaspace/metaspaceContext.hpp"
! #include "memory/metaspace/metaspaceEnums.hpp"
! #include "memory/metaspace/metaspaceReport.hpp"
! #include "memory/metaspace/metaspaceSizesSnapshot.hpp"
! #include "memory/metaspace/runningCounters.hpp"
! #include "memory/metaspace/settings.hpp"
#include "memory/metaspace/virtualSpaceList.hpp"
#include "memory/universe.hpp"
#include "oops/compressedOops.hpp"
#include "runtime/atomic.hpp"
#include "runtime/init.hpp"
+ #include "runtime/java.hpp"
#include "services/memTracker.hpp"
#include "utilities/copy.hpp"
#include "utilities/debug.hpp"
#include "utilities/formatBuffer.hpp"
#include "utilities/globalDefinitions.hpp"
! using metaspace::ChunkManager;
! using metaspace::CommitLimiter;
! using metaspace::MetaspaceContext;
! using metaspace::MetaspaceReporter;
! using metaspace::RunningCounters;
! using metaspace::VirtualSpaceList;
! size_t MetaspaceUtils::used_words() {
! return RunningCounters::used_words();
! }
! size_t MetaspaceUtils::used_words(Metaspace::MetadataType mdtype) {
! return metaspace::is_class(mdtype) ? RunningCounters::used_words_class() : RunningCounters::used_words_nonclass();
! }
!
! size_t MetaspaceUtils::reserved_words() {
! return RunningCounters::reserved_words();
! }
!
! size_t MetaspaceUtils::reserved_words(Metaspace::MetadataType mdtype) {
! return metaspace::is_class(mdtype) ? RunningCounters::reserved_words_class() : RunningCounters::reserved_words_nonclass();
! }
! size_t MetaspaceUtils::committed_words() {
! return RunningCounters::committed_words();
! }
!
! size_t MetaspaceUtils::committed_words(Metaspace::MetadataType mdtype) {
! return metaspace::is_class(mdtype) ? RunningCounters::committed_words_class() : RunningCounters::committed_words_nonclass();
! }
!
!
!
! void MetaspaceUtils::print_metaspace_change(const metaspace::MetaspaceSizesSnapshot& pre_meta_values) {
! const metaspace::MetaspaceSizesSnapshot meta_values;
!
! // We print used and committed since these are the most useful at-a-glance vitals for Metaspace:
! // - used tells you how much memory is actually used for metadata
! // - committed tells you how much memory is committed for the purpose of metadata
! // The difference between those two would be waste, which can have various forms (freelists,
! // unused parts of committed chunks etc)
! //
! // Left out is reserved, since this is not as exciting as the first two values: for class space,
! // it is a constant (to uninformed users, often confusingly large). For non-class space, it would
! // be interesting since free chunks can be uncommitted, but for now it is left out.
!
! if (Metaspace::using_class_space()) {
! log_info(gc, metaspace)(HEAP_CHANGE_FORMAT" "
! HEAP_CHANGE_FORMAT" "
! HEAP_CHANGE_FORMAT,
! HEAP_CHANGE_FORMAT_ARGS("Metaspace",
! pre_meta_values.used(),
! pre_meta_values.committed(),
! meta_values.used(),
! meta_values.committed()),
! HEAP_CHANGE_FORMAT_ARGS("NonClass",
! pre_meta_values.non_class_used(),
! pre_meta_values.non_class_committed(),
! meta_values.non_class_used(),
! meta_values.non_class_committed()),
! HEAP_CHANGE_FORMAT_ARGS("Class",
! pre_meta_values.class_used(),
! pre_meta_values.class_committed(),
! meta_values.class_used(),
! meta_values.class_committed()));
! } else {
! log_info(gc, metaspace)(HEAP_CHANGE_FORMAT,
! HEAP_CHANGE_FORMAT_ARGS("Metaspace",
! pre_meta_values.used(),
! pre_meta_values.committed(),
! meta_values.used(),
! meta_values.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) {
! MetaspaceReporter::print_basic_report(out, scale);
! }
!
! // Prints a report about the current metaspace state.
! // Optional parts can be enabled via flags.
! // Function will walk the CLDG and will lock the expand lock; if that is not
! // convenient, use print_basic_report() instead.
! void MetaspaceUtils::print_report(outputStream* out, size_t scale) {
! const int flags =
! MetaspaceReporter::rf_show_loaders |
! MetaspaceReporter::rf_break_down_by_chunktype |
! MetaspaceReporter::rf_show_classes;
! MetaspaceReporter::print_report(out, scale, flags);
! }
!
! void MetaspaceUtils::print_on(outputStream* out) {
!
! // Used from all GCs. It first prints out totals, then, separately, the class space portion.
!
! out->print_cr(" Metaspace "
! "used " SIZE_FORMAT "K, "
! "committed " SIZE_FORMAT "K, "
! "reserved " SIZE_FORMAT "K",
! used_bytes()/K,
! committed_bytes()/K,
! reserved_bytes()/K);
!
! if (Metaspace::using_class_space()) {
! const Metaspace::MetadataType ct = Metaspace::ClassType;
! out->print_cr(" class space "
! "used " SIZE_FORMAT "K, "
! "committed " SIZE_FORMAT "K, "
! "reserved " SIZE_FORMAT "K",
! used_bytes(ct)/K,
! committed_bytes(ct)/K,
! reserved_bytes(ct)/K);
! }
! }
! #ifdef ASSERT
! void MetaspaceUtils::verify(bool slow) {
! if (Metaspace::initialized()) {
! // Verify non-class chunkmanager...
! ChunkManager* cm = ChunkManager::chunkmanager_nonclass();
! cm->verify(slow);
!
! // ... and space list.
! VirtualSpaceList* vsl = VirtualSpaceList::vslist_nonclass();
! vsl->verify(slow);
!
! if (Metaspace::using_class_space()) {
! // If we use compressed class pointers, verify class chunkmanager...
! cm = ChunkManager::chunkmanager_class();
! assert(cm != NULL, "Sanity");
! cm->verify(slow);
!
! // ... and class spacelist.
! VirtualSpaceList* vsl = VirtualSpaceList::vslist_nonclass();
! assert(vsl != NULL, "Sanity");
! vsl->verify(slow);
! }
+ }
+ }
+ #endif
+
+ ////////////////////////////////7
// MetaspaceGC methods
+ volatile size_t MetaspaceGC::_capacity_until_GC = 0;
+ uint MetaspaceGC::_shrink_factor = 0;
+
// 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
*** 349,1014 ****
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(pstat, words);
! }
!
! 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(pstat, words);
! }
!
! 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;
! }
! 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(const metaspace::MetaspaceSizesSnapshot& pre_meta_values) {
! const metaspace::MetaspaceSizesSnapshot meta_values;
!
! if (Metaspace::using_class_space()) {
! log_info(gc, metaspace)(HEAP_CHANGE_FORMAT" "
! HEAP_CHANGE_FORMAT" "
! HEAP_CHANGE_FORMAT,
! HEAP_CHANGE_FORMAT_ARGS("Metaspace",
! pre_meta_values.used(),
! pre_meta_values.committed(),
! meta_values.used(),
! meta_values.committed()),
! HEAP_CHANGE_FORMAT_ARGS("NonClass",
! pre_meta_values.non_class_used(),
! pre_meta_values.non_class_committed(),
! meta_values.non_class_used(),
! meta_values.non_class_committed()),
! HEAP_CHANGE_FORMAT_ARGS("Class",
! pre_meta_values.class_used(),
! pre_meta_values.class_committed(),
! meta_values.class_used(),
! meta_values.class_committed()));
! } else {
! log_info(gc, metaspace)(HEAP_CHANGE_FORMAT,
! HEAP_CHANGE_FORMAT_ARGS("Metaspace",
! pre_meta_values.used(),
! pre_meta_values.committed(),
! meta_values.used(),
! meta_values.committed()));
! }
! }
!
! 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 ");
! }
! }
! }
!
! static void print_basic_switches(outputStream* out, size_t scale) {
! out->print("MaxMetaspaceSize: ");
! if (MaxMetaspaceSize >= (max_uintx) - (2 * os::vm_page_size())) {
! // aka "very big". Default is max_uintx, but due to rounding in arg parsing the real
! // value is smaller.
! out->print("unlimited");
! } else {
! print_human_readable_size(out, MaxMetaspaceSize, scale);
! }
! out->cr();
! if (Metaspace::using_class_space()) {
! out->print("CompressedClassSpaceSize: ");
! print_human_readable_size(out, CompressedClassSpaceSize, scale);
! }
! out->cr();
! }
!
! // 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) {
!
! if (!Metaspace::initialized()) {
! out->print_cr("Metaspace not yet initialized.");
! return;
! }
!
! 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_bytes(), scale);
! out->cr();
! if (Metaspace::using_class_space()) {
! out->print(" Class: ");
! print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_bytes(), scale);
! out->cr();
! out->print(" Both: ");
! print_human_readable_size(out, Metaspace::chunk_manager_class()->free_chunks_total_bytes() +
! Metaspace::chunk_manager_metadata()->free_chunks_total_bytes(), scale);
! out->cr();
! }
!
! out->cr();
!
! // Print basic settings
! print_basic_switches(out, scale);
!
! out->cr();
!
! }
!
! void MetaspaceUtils::print_report(outputStream* out, size_t scale, int flags) {
!
! if (!Metaspace::initialized()) {
! out->print_cr("Metaspace not yet initialized.");
! return;
! }
!
! 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::loaded_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_loaders = cl._num_loaders_by_spacetype[space_type];
! uintx num_classes = cl._num_classes_by_spacetype[space_type];
! out->print("%s - " UINTX_FORMAT " %s",
! space_type_name((Metaspace::MetaspaceType)space_type),
! num_loaders, loaders_plural(num_loaders));
! if (num_classes > 0) {
! out->print(", ");
! print_number_of_classes(out, num_classes, cl._num_classes_shared_by_spacetype[space_type]);
! out->print(":");
! cl._stats_by_spacetype[space_type].print_on(out, scale, print_by_chunktype);
! } else {
! out->print(".");
! out->cr();
! }
! out->cr();
! }
! }
!
! // Print totals for in-use data:
! out->cr();
! {
! uintx num_loaders = cl._num_loaders;
! out->print("Total Usage - " UINTX_FORMAT " %s, ",
! num_loaders, loaders_plural(num_loaders));
! print_number_of_classes(out, cl._num_classes, cl._num_classes_shared);
! out->print(":");
! cl._stats_total.print_on(out, scale, print_by_chunktype);
! out->cr();
! }
!
! // -- 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->print_cr("Number of chunks added to freelist: " UINTX_FORMAT ".",
! g_internal_statistics.num_chunks_added_to_freelist);
! out->print_cr("Number of chunks removed from freelist: " UINTX_FORMAT ".",
! g_internal_statistics.num_chunks_removed_from_freelist);
! out->print_cr("Number of chunk merges: " UINTX_FORMAT ", split-ups: " UINTX_FORMAT ".",
! g_internal_statistics.num_chunk_merges, g_internal_statistics.num_chunk_splits);
!
! out->cr();
! #endif
!
! // Print some interesting settings
! out->cr();
! out->cr();
! print_basic_switches(out, scale);
!
! out->cr();
! out->print("InitialBootClassLoaderMetaspaceSize: ");
! print_human_readable_size(out, InitialBootClassLoaderMetaspaceSize, 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) {
! MutexLocker 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() {
! #ifdef ASSERT
! Metaspace::chunk_manager_metadata()->verify(false);
! if (Metaspace::using_class_space()) {
! Metaspace::chunk_manager_class()->verify(false);
! }
! #endif
! }
! 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;
-
- bool Metaspace::_initialized = false;
-
- #define VIRTUALSPACEMULTIPLIER 2
-
#ifdef _LP64
void Metaspace::print_compressed_class_space(outputStream* st) {
! if (_class_space_list != NULL) {
! address base = (address)_class_space_list->current_virtual_space()->bottom();
! address top = base + compressed_class_space_size();
! st->print("Compressed class space mapped at: " PTR_FORMAT "-" PTR_FORMAT ", size: " SIZE_FORMAT,
! p2i(base), p2i(top), top - base);
st->cr();
}
}
// Given a prereserved space, use that to set up the compressed class space list.
void Metaspace::initialize_class_space(ReservedSpace rs) {
assert(using_class_space(), "Must be using class space");
- assert(_class_space_list == NULL && _chunk_manager_class == NULL, "Only call once");
assert(rs.size() == CompressedClassSpaceSize, SIZE_FORMAT " != " SIZE_FORMAT,
rs.size(), CompressedClassSpaceSize);
assert(is_aligned(rs.base(), Metaspace::reserve_alignment()) &&
is_aligned(rs.size(), Metaspace::reserve_alignment()),
"wrong alignment");
! _class_space_list = new VirtualSpaceList(rs);
! _chunk_manager_class = new ChunkManager(true/*is_class*/);
// This does currently not work because rs may be the result of a split
// operation and NMT seems not to be able to handle splits.
// Will be fixed with JDK-8243535.
// MemTracker::record_virtual_memory_type((address)rs.base(), mtClass);
! if (!_class_space_list->initialization_succeeded()) {
! vm_exit_during_initialization("Failed to setup compressed class space virtual space list.");
! }
}
// Reserve a range of memory at an address suitable for en/decoding narrow
// Klass pointers (see: CompressedClassPointers::is_valid_base()).
// The returned address shall both be suitable as a compressed class pointers
--- 476,535 ----
new_capacity_until_GC,
MetaspaceGCThresholdUpdater::ComputeNewSize);
}
}
! ////// Metaspace methods /////
! const MetaspaceTracer* Metaspace::_tracer = NULL;
! DEBUG_ONLY(bool Metaspace::_frozen = false;)
! bool Metaspace::initialized() {
! return metaspace::MetaspaceContext::context_nonclass() != NULL &&
! (using_class_space() ? metaspace::MetaspaceContext::context_class() != NULL : true);
}
#ifdef _LP64
void Metaspace::print_compressed_class_space(outputStream* st) {
! if (VirtualSpaceList::vslist_class() != NULL) {
! MetaWord* base = VirtualSpaceList::vslist_class()->base_of_first_node();
! size_t size = VirtualSpaceList::vslist_class()->word_size_of_first_node();
! MetaWord* top = base + size;
! st->print("Compressed class space mapped at: " PTR_FORMAT "-" PTR_FORMAT ", reserved size: " SIZE_FORMAT,
! p2i(base), p2i(top), (top - base) * BytesPerWord);
st->cr();
}
}
// Given a prereserved space, use that to set up the compressed class space list.
void Metaspace::initialize_class_space(ReservedSpace rs) {
+ assert(rs.size() >= CompressedClassSpaceSize,
+ SIZE_FORMAT " != " SIZE_FORMAT, rs.size(), CompressedClassSpaceSize);
assert(using_class_space(), "Must be using class space");
assert(rs.size() == CompressedClassSpaceSize, SIZE_FORMAT " != " SIZE_FORMAT,
rs.size(), CompressedClassSpaceSize);
assert(is_aligned(rs.base(), Metaspace::reserve_alignment()) &&
is_aligned(rs.size(), Metaspace::reserve_alignment()),
"wrong alignment");
! MetaspaceContext::initialize_class_space_context(rs);
// This does currently not work because rs may be the result of a split
// operation and NMT seems not to be able to handle splits.
// Will be fixed with JDK-8243535.
// MemTracker::record_virtual_memory_type((address)rs.base(), mtClass);
! }
+ // Returns true if class space has been setup (initialize_class_space).
+ bool Metaspace::class_space_is_initialized() {
+ return MetaspaceContext::context_class() != NULL;
}
// Reserve a range of memory at an address suitable for en/decoding narrow
// Klass pointers (see: CompressedClassPointers::is_valid_base()).
// The returned address shall both be suitable as a compressed class pointers
*** 1061,1136 ****
}
#endif // _LP64
! void Metaspace::ergo_initialize() {
! if (DumpSharedSpaces) {
! // Using large pages when dumping the shared archive is currently not implemented.
! FLAG_SET_ERGO(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());
! // The upcoming Metaspace rewrite will impose a higher alignment granularity.
! // To prepare for that and to catch/prevent any misuse of Metaspace alignment
! // which may creep in, up the alignment a bit.
! if (_reserve_alignment == 4 * K) {
! _reserve_alignment *= 4;
! }
! // 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(CompressedClassSpaceSize,
! MaxMetaspaceSize - min_metaspace_sz);
! }
! }
! } else if (min_metaspace_sz >= MaxMetaspaceSize) {
! FLAG_SET_ERGO(InitialBootClassLoaderMetaspaceSize,
! min_metaspace_sz);
! }
- set_compressed_class_space_size(CompressedClassSpaceSize);
}
void Metaspace::global_initialize() {
! MetaspaceGC::initialize();
// If UseCompressedClassPointers=1, we have two cases:
// a) if CDS is active (either dump time or runtime), it will create the ccs
// for us, initialize it and set up CompressedKlassPointers encoding.
// Class space will be reserved above the mapped archives.
--- 582,675 ----
}
#endif // _LP64
! size_t Metaspace::reserve_alignment_words() {
! return metaspace::Settings::virtual_space_node_reserve_alignment_words();
! }
! size_t Metaspace::commit_alignment_words() {
! return metaspace::Settings::commit_granule_words();
! }
! void Metaspace::ergo_initialize() {
! // Must happen before using any setting from Settings::---
! metaspace::Settings::ergo_initialize();
! // MaxMetaspaceSize and CompressedClassSpaceSize:
//
! // MaxMetaspaceSize is the maximum size, in bytes, of memory we are allowed
! // to commit for the Metaspace.
! // It is just a number; a limit we compare against before committing. It
! // does not have to be aligned to anything.
! // It gets used as compare value in class CommitLimiter.
! // It is set to max_uintx in globals.hpp by default, so by default it does
! // not limit anything.
! //
! // CompressedClassSpaceSize is the size, in bytes, of the address range we
! // pre-reserve for the compressed class space (if we use class space).
! // This size has to be aligned to the metaspace reserve alignment (to the
! // size of a root chunk). It gets aligned up from whatever value the caller
! // gave us to the next multiple of root chunk size.
! //
! // Note: Strictly speaking MaxMetaspaceSize and CompressedClassSpaceSize have
! // very little to do with each other. The notion often encountered:
! // MaxMetaspaceSize = CompressedClassSpaceSize + <non-class metadata size>
! // is subtly wrong: MaxMetaspaceSize can besmaller than CompressedClassSpaceSize,
! // in which case we just would not be able to fully commit the class space range.
! //
! // We still adjust CompressedClassSpaceSize to reasonable limits, mainly to
! // save on reserved space, and to make ergnonomics less confusing.
!
! // (aligned just for cleanliness:)
! MaxMetaspaceSize = MAX2(align_down(MaxMetaspaceSize, commit_alignment()), commit_alignment());
!
! if (UseCompressedClassPointers) {
! // Let CCS size not be larger than 80% of MaxMetaspaceSize. Note that is
! // grossly over-dimensioned for most usage scenarios; typical ratio of
! // class space : non class space usage is about 1:6. With many small classes,
! // it can get as low as 1:2. It is not a big deal though since ccs is only
! // reserved and will be committed on demand only.
! size_t max_ccs_size = MaxMetaspaceSize * 0.8;
! size_t adjusted_ccs_size = MIN2(CompressedClassSpaceSize, max_ccs_size);
!
! // CCS must be aligned to root chunk size, and be at least the size of one
! // root chunk.
! adjusted_ccs_size = align_up(adjusted_ccs_size, reserve_alignment());
! adjusted_ccs_size = MAX2(adjusted_ccs_size, reserve_alignment());
!
! // Note: re-adjusting may have us left with a CompressedClassSpaceSize
! // larger than MaxMetaspaceSize for very small values of MaxMetaspaceSize.
! // Lets just live with that, its not a big deal.
!
! if (adjusted_ccs_size != CompressedClassSpaceSize) {
! FLAG_SET_ERGO(CompressedClassSpaceSize, adjusted_ccs_size);
! log_info(metaspace)("Setting CompressedClassSpaceSize to " SIZE_FORMAT ".",
! CompressedClassSpaceSize);
! }
! }
+ // Set MetaspaceSize, MinMetaspaceExpansion and MaxMetaspaceExpansion
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());
}
void Metaspace::global_initialize() {
! MetaspaceGC::initialize(); // <- since we do not prealloc init chunks anymore is this still needed?
!
! metaspace::ChunkHeaderPool::initialize();
// If UseCompressedClassPointers=1, we have two cases:
// a) if CDS is active (either dump time or runtime), it will create the ccs
// for us, initialize it and set up CompressedKlassPointers encoding.
// Class space will be reserved above the mapped archives.
*** 1186,1196 ****
// ...failing that, give up.
if (!rs.is_reserved()) {
vm_exit_during_initialization(
err_msg("Could not allocate compressed class space: " SIZE_FORMAT " bytes",
! compressed_class_space_size()));
}
// Initialize space
Metaspace::initialize_class_space(rs);
--- 725,735 ----
// ...failing that, give up.
if (!rs.is_reserved()) {
vm_exit_during_initialization(
err_msg("Could not allocate compressed class space: " SIZE_FORMAT " bytes",
! CompressedClassSpaceSize));
}
// Initialize space
Metaspace::initialize_class_space(rs);
*** 1198,1232 ****
CompressedKlassPointers::initialize((address)rs.base(), rs.size());
}
#endif
! // 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();
! _initialized = true;
#ifdef _LP64
if (UseCompressedClassPointers) {
// Note: "cds" would be a better fit but keep this for backward compatibility.
LogTarget(Info, gc, metaspace) lt;
--- 737,764 ----
CompressedKlassPointers::initialize((address)rs.base(), rs.size());
}
#endif
! // Initialize non-class virtual space list, and its chunk manager:
! MetaspaceContext::initialize_nonclass_space_context();
_tracer = new MetaspaceTracer();
! // We must prevent the very first address of the ccs from being used to store
! // metadata, since that address would translate to a narrow pointer of 0, and the
! // VM does not distinguish between "narrow 0 as in NULL" and "narrow 0 as in start
! // of ccs".
! // Before Elastic Metaspace that did not happen due to the fact that every Metachunk
! // had a header and therefore could not allocate anything at offset 0.
! #ifdef _LP64
! if (using_class_space()) {
! // The simplest way to fix this is to allocate a tiny dummy chunk right at the
! // start of ccs and do not use it for anything.
! MetaspaceContext::context_class()->cm()->get_chunk(metaspace::chunklevel::HIGHEST_CHUNK_LEVEL);
! }
! #endif
#ifdef _LP64
if (UseCompressedClassPointers) {
// Note: "cds" would be a better fit but keep this for backward compatibility.
LogTarget(Info, gc, metaspace) lt;
*** 1244,1270 ****
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");
assert(!(DumpSharedSpaces && THREAD->is_VM_thread()), "sanity");
if (HAS_PENDING_EXCEPTION) {
assert(false, "Should not allocate with exception pending");
--- 776,794 ----
void Metaspace::post_initialize() {
MetaspaceGC::post_initialize();
}
! size_t Metaspace::max_allocation_word_size() {
! const size_t max_overhead_words = metaspace::get_raw_word_size_for_requested_word_size(1);
! return metaspace::chunklevel::MAX_CHUNK_WORD_SIZE - max_overhead_words;
}
MetaWord* Metaspace::allocate(ClassLoaderData* loader_data, size_t word_size,
MetaspaceObj::Type type, TRAPS) {
+ assert(word_size <= Metaspace::max_allocation_word_size(),
+ "allocation size too large (" SIZE_FORMAT ")", word_size);
assert(!_frozen, "sanity");
assert(!(DumpSharedSpaces && THREAD->is_VM_thread()), "sanity");
if (HAS_PENDING_EXCEPTION) {
assert(false, "Should not allocate with exception pending");
*** 1272,1282 ****
}
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) {
--- 796,806 ----
}
assert(loader_data != NULL, "Should never pass around a NULL loader_data. "
"ClassLoaderData::the_null_class_loader_data() should have been used.");
! Metaspace::MetadataType mdtype = (type == MetaspaceObj::ClassType) ? Metaspace::ClassType : Metaspace::NonClassType;
// Try to allocate metadata.
MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
if (result == NULL) {
*** 1305,1325 ****
}
// 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);
--- 829,851 ----
}
// Zero initialize.
Copy::fill_to_words((HeapWord*)result, word_size, 0);
+ log_trace(metaspace)("Metaspace::allocate: type %d return " PTR_FORMAT ".", (int)type, p2i(result));
+
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,
! metaspace::is_class(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);
*** 1328,1343 ****
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 ?
--- 854,874 ----
LogStream ls(log.info());
// In case of an OOM, log out a short but still useful report.
MetaspaceUtils::print_basic_report(&ls, 0);
}
+ // Which limit did we hit? CompressedClassSpaceSize or MaxMetaspaceSize?
bool out_of_compressed_class_space = false;
! if (metaspace::is_class(mdtype)) {
ClassLoaderMetaspace* metaspace = loader_data->metaspace_non_null();
out_of_compressed_class_space =
MetaspaceUtils::committed_bytes(Metaspace::ClassType) +
! // TODO: Okay this is just cheesy.
! // Of course this may fail and return incorrect results.
! // Think this over - we need some clean way to remember which limit
! // exactly we hit during an allocation. Some sort of allocation context structure?
! align_up(word_size * BytesPerWord, 4 * M) >
CompressedClassSpaceSize;
}
// -XX:+HeapDumpOnOutOfMemoryError and -XX:OnOutOfMemoryError support
const char* space_string = out_of_compressed_class_space ?
*** 1360,1389 ****
} 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() {
! MutexLocker 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)) {
--- 891,910 ----
} else {
THROW_OOP(Universe::out_of_memory_error_metaspace());
}
}
void Metaspace::purge() {
! ChunkManager* cm = ChunkManager::chunkmanager_nonclass();
! if (cm != NULL) {
! cm->purge();
! }
if (using_class_space()) {
! cm = ChunkManager::chunkmanager_class();
! if (cm != NULL) {
! cm->purge();
! }
}
}
bool Metaspace::contains(const void* ptr) {
if (MetaspaceShared::is_in_shared_metaspace(ptr)) {
*** 1391,1606 ****
}
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() {
! Metaspace::assert_not_frozen();
! 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);
! }
!
! MutexLocker 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;
! bool can_retry = true;
! 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, &can_retry);
! res = allocate(word_size, mdtype);
! } while (!incremented && res == NULL && can_retry);
!
! 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));
!
! MutexLocker 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 {
! MutexLocker cl(lock(), Mutex::_no_safepoint_check_flag);
! add_to_statistics_locked(out);
! }
!
! /////////////// Unit tests ///////////////
!
! 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;
! }
}
--- 912,922 ----
}
return contains_non_shared(ptr);
}
bool Metaspace::contains_non_shared(const void* ptr) {
! if (using_class_space() && VirtualSpaceList::vslist_class()->contains((MetaWord*)ptr)) {
return true;
}
! return VirtualSpaceList::vslist_nonclass()->contains((MetaWord*)ptr);
}
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