--- a/src/hotspot/share/memory/metaspace.cpp Tue Sep 10 14:52:53 2019 +0800
+++ b/src/hotspot/share/memory/metaspace.cpp Tue Sep 10 09:24:05 2019 +0200
@@ -22,65 +22,204 @@
*
*/
+#include <memory/metaspace/settings.hpp>
#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/metaspace/chunkManager.hpp"
+#include "memory/metaspace/classLoaderMetaspace.hpp"
+#include "memory/metaspace/commitLimiter.hpp"
+#include "memory/metaspace/metaspaceCommon.hpp"
+#include "memory/metaspace/metaspaceEnums.hpp"
+#include "memory/metaspace/metaspaceReport.hpp"
+#include "memory/metaspace/metaspaceSizesSnapshot.hpp"
+#include "memory/metaspace/runningCounters.hpp"
+#include "memory/metaspace/virtualSpaceList.hpp"
#include "memory/universe.hpp"
#include "oops/compressedOops.hpp"
#include "runtime/init.hpp"
+#include "runtime/java.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"
-#include "utilities/vmError.hpp"
+
+
+using metaspace::ChunkManager;
+using metaspace::ClassLoaderMetaspace;
+using metaspace::CommitLimiter;
+using metaspace::MetaspaceType;
+using metaspace::MetadataType;
+using metaspace::MetaspaceReporter;
+using metaspace::RunningCounters;
+using metaspace::VirtualSpaceList;
+
+
+// Used by MetaspaceCounters
+size_t MetaspaceUtils::free_chunks_total_words(MetadataType mdtype) {
+ return is_class(mdtype) ? RunningCounters::free_chunks_words_class() : RunningCounters::free_chunks_words_nonclass();
+}
+
+size_t MetaspaceUtils::used_words() {
+ return RunningCounters::used_words();
+}
+
+size_t MetaspaceUtils::used_words(MetadataType mdtype) {
+ return 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(MetadataType mdtype) {
+ return 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(MetadataType mdtype) {
+ return is_class(mdtype) ? RunningCounters::committed_words_class() : RunningCounters::committed_words_nonclass();
+}
+
-using namespace metaspace;
+void MetaspaceUtils::print_metaspace_change(const metaspace::MetaspaceSizesSnapshot& pre_meta_values) {
+ const metaspace::MetaspaceSizesSnapshot meta_values;
-MetaWord* last_allocated = 0;
+ // 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.
-size_t Metaspace::_compressed_class_space_size;
-const MetaspaceTracer* Metaspace::_tracer = NULL;
+ 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()));
+ }
+}
-DEBUG_ONLY(bool Metaspace::_frozen = false;)
+
+// Prints an ASCII representation of the given space.
+void MetaspaceUtils::print_metaspace_map(outputStream* out, MetadataType mdtype) {
+ out->print_cr("-- not yet implemented ---");
+}
+
+// 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);
+}
-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();
+// 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_full_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 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);
}
- return s;
}
+#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;
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
@@ -198,7 +337,7 @@
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);
+ 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));
@@ -352,626 +491,21 @@
}
}
-// 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;
- }
- 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);
- }
-}
+////// Metaspace methods /////
-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;
-
+MetaWord* Metaspace::_compressed_class_space_base = NULL;
+size_t Metaspace::_compressed_class_space_size = 0;
+const MetaspaceTracer* Metaspace::_tracer = NULL;
+bool Metaspace::_initialized = false;
size_t Metaspace::_commit_alignment = 0;
size_t Metaspace::_reserve_alignment = 0;
-VirtualSpaceList* Metaspace::_space_list = NULL;
-VirtualSpaceList* Metaspace::_class_space_list = NULL;
+DEBUG_ONLY(bool Metaspace::_frozen = false;)
-ChunkManager* Metaspace::_chunk_manager_metadata = NULL;
-ChunkManager* Metaspace::_chunk_manager_class = NULL;
-
-bool Metaspace::_initialized = false;
-
-#define VIRTUALSPACEMULTIPLIER 2
#ifdef _LP64
static const uint64_t UnscaledClassSpaceMax = (uint64_t(max_juint) + 1);
@@ -1002,6 +536,15 @@
}
}
+ // We must prevent any metaspace object from being allocated directly at
+ // CompressedKlassPointers::base() - that would translate to a narrow Klass
+ // pointer of 0, which has a special meaning (invalid) (Note: that was
+ // never a problem in old metaspace, since every chunk was prefixed by its
+ // header, so allocation at position 0 in a chunk was never possible).
+ if (lower_base == metaspace_base) {
+ lower_base -= os::vm_page_size();
+ }
+
CompressedKlassPointers::set_base(lower_base);
// CDS uses LogKlassAlignmentInBytes for narrow_klass_shift. See
@@ -1047,23 +590,23 @@
bool large_pages = false;
#if !(defined(AARCH64) || defined(AIX))
- ReservedSpace metaspace_rs = ReservedSpace(compressed_class_space_size(),
+ ReservedSpace rs = ReservedSpace(compressed_class_space_size(),
_reserve_alignment,
large_pages,
requested_addr);
#else // AARCH64
- ReservedSpace metaspace_rs;
+ ReservedSpace 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(),
+ rs = ReservedSpace(compressed_class_space_size(),
_reserve_alignment,
large_pages,
requested_addr);
}
- if (! metaspace_rs.is_reserved()) {
+ if (! 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.
@@ -1083,7 +626,7 @@
&& ! 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(),
+ rs = ReservedSpace(compressed_class_space_size(),
_reserve_alignment,
large_pages,
requested_addr);
@@ -1091,18 +634,18 @@
}
#endif
- metaspace_rs = ReservedSpace(compressed_class_space_size(),
+ rs = ReservedSpace(compressed_class_space_size(),
_reserve_alignment,
large_pages,
a);
- if (metaspace_rs.is_reserved())
+ if (rs.is_reserved())
break;
}
}
#endif // AARCH64
- if (!metaspace_rs.is_reserved()) {
+ if (!rs.is_reserved()) {
#if INCLUDE_CDS
if (UseSharedSpaces) {
size_t increment = align_up(1*G, _reserve_alignment);
@@ -1111,10 +654,10 @@
// 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) &&
+ while (!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(),
+ rs = ReservedSpace(compressed_class_space_size(),
_reserve_alignment, large_pages, addr);
}
}
@@ -1124,10 +667,10 @@
// 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(),
+ if (!rs.is_reserved()) {
+ rs = ReservedSpace(compressed_class_space_size(),
_reserve_alignment, large_pages);
- if (!metaspace_rs.is_reserved()) {
+ if (!rs.is_reserved()) {
vm_exit_during_initialization(err_msg("Could not allocate metaspace: " SIZE_FORMAT " bytes",
compressed_class_space_size()));
}
@@ -1135,19 +678,21 @@
}
// If we got here then the metaspace got allocated.
- MemTracker::record_virtual_memory_type((address)metaspace_rs.base(), mtClass);
+ MemTracker::record_virtual_memory_type((address)rs.base(), mtClass);
+
+ _compressed_class_space_base = (MetaWord*)rs.base();
#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)) {
+ if (UseSharedSpaces && !can_use_cds_with_metaspace_addr(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(),
+ set_narrow_klass_base_and_shift((address)rs.base(),
UseSharedSpaces ? (address)cds_base : 0);
- initialize_class_space(metaspace_rs);
+ initialize_class_space(rs);
LogTarget(Trace, gc, metaspace) lt;
if (lt.is_enabled()) {
@@ -1157,13 +702,29 @@
}
}
+// 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");
+
+ VirtualSpaceList* vsl = new VirtualSpaceList("class space list", rs, CommitLimiter::globalLimiter());
+ VirtualSpaceList::set_vslist_class(vsl);
+ ChunkManager* cm = new ChunkManager("class space chunk manager", vsl);
+ ChunkManager::set_chunkmanager_class(cm);
+
+}
+
+
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(CompressedKlassPointers::base()), CompressedKlassPointers::shift());
- if (_class_space_list != NULL) {
- address base = (address)_class_space_list->current_virtual_space()->bottom();
+ if (Metaspace::using_class_space()) {
st->print("Compressed class space size: " SIZE_FORMAT " Address: " PTR_FORMAT,
- compressed_class_space_size(), p2i(base));
+ compressed_class_space_size(), p2i(compressed_class_space_base()));
if (requested_addr != 0) {
st->print(" Req Addr: " PTR_FORMAT, p2i(requested_addr));
}
@@ -1171,24 +732,23 @@
}
}
-// 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() {
+
+ // Must happen before using any setting from Settings::---
+ metaspace::Settings::strategy_t strat = metaspace::Settings::strategy_balanced_reclaim;
+ if (strcmp(MetaspaceReclaimStrategy, "balanced") == 0) {
+ strat = metaspace::Settings::strategy_balanced_reclaim;
+ } else if (strcmp(MetaspaceReclaimStrategy, "aggressive") == 0) {
+ strat = metaspace::Settings::strategy_aggressive_reclaim;
+ } else if (strcmp(MetaspaceReclaimStrategy, "none") == 0) {
+ strat = metaspace::Settings::strategy_no_reclaim;
+ } else {
+ vm_exit_during_initialization("Invalid value for MetaspaceReclaimStrategy: \"%s\".", MetaspaceReclaimStrategy);
+ }
+ metaspace::Settings::initialize(strat, MetaspaceAlwaysUseClassSpace);
+
if (DumpSharedSpaces) {
// Using large pages when dumping the shared archive is currently not implemented.
FLAG_SET_ERGO(UseLargePagesInMetaspace, false);
@@ -1199,8 +759,15 @@
page_size = os::large_page_size();
}
- _commit_alignment = page_size;
- _reserve_alignment = MAX2(page_size, (size_t)os::vm_allocation_granularity());
+ // Commit alignment: (I would rather hide this since this is an implementation detail but we need it
+ // when calculating the gc threshold).
+ _commit_alignment = metaspace::Settings::commit_granule_bytes();
+
+ // Reserve alignment: all Metaspace memory mappings are to be aligned to the size of a root chunk.
+ _reserve_alignment = MAX2(page_size, (size_t)metaspace::chklvl::MAX_CHUNK_BYTE_SIZE);
+
+ assert(is_aligned(_reserve_alignment, os::vm_allocation_granularity()),
+ "root chunk size must be a multiple of alloc granularity");
// Do not use FLAG_SET_ERGO to update MaxMetaspaceSize, since this will
// override if MaxMetaspaceSize was set on the command line or not.
@@ -1225,28 +792,26 @@
CompressedClassSpaceSize = align_down_bounded(CompressedClassSpaceSize, _reserve_alignment);
- // Initial virtual space size will be calculated at global_initialize()
- size_t min_metaspace_sz =
- VIRTUALSPACEMULTIPLIER * InitialBootClassLoaderMetaspaceSize;
+ // Note: InitialBootClassLoaderMetaspaceSize is an old parameter which is used to determine the chunk size
+ // of the first non-class chunk handed to the boot class loader. See metaspace/chunkAllocSequence.hpp.
+ size_t min_metaspace_sz = align_up(InitialBootClassLoaderMetaspaceSize, _reserve_alignment);
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);
- }
+ if (min_metaspace_sz >= MaxMetaspaceSize) {
+ vm_exit_during_initialization("MaxMetaspaceSize is too small.");
+ } else if ((min_metaspace_sz + CompressedClassSpaceSize) > MaxMetaspaceSize) {
+ 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);
+ _compressed_class_space_size = CompressedClassSpaceSize;
+
}
void Metaspace::global_initialize() {
- MetaspaceGC::initialize();
+ MetaspaceGC::initialize(); // <- since we do not prealloc init chunks anymore is this still needed?
#if INCLUDE_CDS
if (DumpSharedSpaces) {
@@ -1262,10 +827,10 @@
if (DynamicDumpSharedSpaces && !UseSharedSpaces) {
vm_exit_during_initialization("DynamicDumpSharedSpaces is unsupported when base CDS archive is not loaded", NULL);
}
+#endif // INCLUDE_CDS
- if (!DumpSharedSpaces && !UseSharedSpaces)
-#endif // INCLUDE_CDS
- {
+ // Initialize class space:
+ if (CDS_ONLY(!DumpSharedSpaces && !UseSharedSpaces) NOT_CDS(true)) {
#ifdef _LP64
if (using_class_space()) {
char* base = (char*)align_up(CompressedOops::end(), _reserve_alignment);
@@ -1274,27 +839,11 @@
#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);
- }
+ // Initialize non-class virtual space list, and its chunk manager:
+ VirtualSpaceList* vsl = new VirtualSpaceList("Non-Class VirtualSpaceList", CommitLimiter::globalLimiter());
+ VirtualSpaceList::set_vslist_nonclass(vsl);
+ ChunkManager* cm = new ChunkManager("Non-Class ChunkManager", vsl);
+ ChunkManager::set_chunkmanager_nonclass(cm);
_tracer = new MetaspaceTracer();
@@ -1306,21 +855,6 @@
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");
@@ -1334,7 +868,7 @@
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;
+ MetadataType mdtype = (type == MetaspaceObj::ClassType) ? metaspace::ClassType : metaspace::NonClassType;
// Try to allocate metadata.
MetaWord* result = loader_data->metaspace_non_null()->allocate(word_size, mdtype);
@@ -1367,6 +901,8 @@
// 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;
}
@@ -1377,7 +913,7 @@
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);
+ is_class(mdtype) ? "class" : "data", word_size);
ResourceMark rm;
if (log.is_debug()) {
if (loader_data->metaspace_or_null() != NULL) {
@@ -1390,12 +926,17 @@
MetaspaceUtils::print_basic_report(&ls, 0);
}
+ // Which limit did we hit? CompressedClassSpaceSize or MaxMetaspaceSize?
bool out_of_compressed_class_space = false;
- if (is_class_space_allocation(mdtype)) {
+ if (is_class(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) >
+ 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;
}
@@ -1422,26 +963,16 @@
}
}
-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() {
+ ChunkManager* cm = ChunkManager::chunkmanager_nonclass();
+ if (cm != NULL) {
+ cm->wholesale_reclaim();
}
-}
-
-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);
+ cm = ChunkManager::chunkmanager_class();
+ if (cm != NULL) {
+ cm->wholesale_reclaim();
+ }
}
}
@@ -1453,214 +984,9 @@
}
bool Metaspace::contains_non_shared(const void* ptr) {
- if (using_class_space() && get_space_list(ClassType)->contains(ptr)) {
+ if (using_class_space() && VirtualSpaceList::vslist_class()->contains((MetaWord*)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);
- }
+ return VirtualSpaceList::vslist_nonclass()->contains((MetaWord*)ptr);
}
-
-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;
- }
-}