--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/classLoaderMetaspace.cpp	Tue Sep 10 09:24:05 2019 +0200
@@ -0,0 +1,177 @@
+/*
+ * Copyright (c) 2018, 2019, SAP SE. All rights reserved.
+ * Copyright (c) 2018, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+#include "precompiled.hpp"
+
+#include "logging/log.hpp"
+#include "memory/metaspace.hpp"
+#include "memory/metaspaceTracer.hpp"
+#include "memory/metaspace/chunkAllocSequence.hpp"
+#include "memory/metaspace/chunkManager.hpp"
+#include "memory/metaspace/classLoaderMetaspace.hpp"
+#include "memory/metaspace/internStat.hpp"
+#include "memory/metaspace/metaspaceEnums.hpp"
+#include "memory/metaspace/metaspaceStatistics.hpp"
+#include "memory/metaspace/runningCounters.hpp"
+#include "memory/metaspace/settings.hpp"
+#include "memory/metaspace/spaceManager.hpp"
+#include "runtime/atomic.hpp"
+#include "utilities/debug.hpp"
+
+namespace metaspace {
+
+static bool use_class_space(bool is_class) {
+  if (Metaspace::using_class_space()) {
+    if (is_class || Settings::always_use_class_space()) {
+      return true;
+    }
+  }
+  return false;
+}
+
+static bool use_class_space(MetadataType mdType) {
+  return use_class_space(is_class(mdType));
+}
+
+ClassLoaderMetaspace::ClassLoaderMetaspace(Mutex* lock, MetaspaceType space_type)
+  : _lock(lock)
+  , _space_type(space_type)
+  , _non_class_space_manager(NULL)
+  , _class_space_manager(NULL)
+{
+  // Initialize non-class spacemanager
+  _non_class_space_manager = new SpaceManager(
+      ChunkManager::chunkmanager_nonclass(),
+      ChunkAllocSequence::alloc_sequence_by_space_type(space_type, false),
+      lock,
+      RunningCounters::used_nonclass_counter(),
+      "non-class sm");
+
+  // If needed, initialize class spacemanager
+  if (Metaspace::using_class_space() || Settings::always_use_class_space()) {
+    _class_space_manager = new SpaceManager(
+        ChunkManager::chunkmanager_class(),
+        ChunkAllocSequence::alloc_sequence_by_space_type(space_type, true),
+        lock,
+        RunningCounters::used_class_counter(),
+        "class sm");
+  }
+
+  DEBUG_ONLY(InternalStats::inc_num_metaspace_births();)
+
+}
+
+ClassLoaderMetaspace::~ClassLoaderMetaspace() {
+  Metaspace::assert_not_frozen();
+
+  delete _non_class_space_manager;
+  delete _class_space_manager;
+
+  DEBUG_ONLY(InternalStats::inc_num_metaspace_deaths();)
+
+}
+
+// Allocate word_size words from Metaspace.
+MetaWord* ClassLoaderMetaspace::allocate(size_t word_size, MetadataType mdType) {
+  Metaspace::assert_not_frozen();
+  if (use_class_space(mdType)) {
+    return class_space_manager()->allocate(word_size);
+  } else {
+    return non_class_space_manager()->allocate(word_size);
+  }
+}
+
+// Attempt to expand the GC threshold to be good for at least another word_size words
+// and allocate. Returns NULL if failure. Used during Metaspace GC.
+MetaWord* ClassLoaderMetaspace::expand_and_allocate(size_t word_size, 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;
+}
+
+// Prematurely returns a metaspace allocation to the _block_freelists
+// because it is not needed anymore.
+void ClassLoaderMetaspace::deallocate(MetaWord* ptr, size_t word_size, bool is_class) {
+
+  Metaspace::assert_not_frozen();
+
+  if (use_class_space(is_class)) {
+    class_space_manager()->deallocate(ptr, word_size);
+  } else {
+    non_class_space_manager()->deallocate(ptr, word_size);
+  }
+
+  DEBUG_ONLY(InternalStats::inc_num_deallocs();)
+
+}
+
+// Update statistics. This walks all in-use chunks.
+void ClassLoaderMetaspace::add_to_statistics(clms_stats_t* out) const {
+  if (non_class_space_manager() != NULL) {
+    non_class_space_manager()->add_to_statistics(&out->sm_stats_nonclass);
+  }
+  if (class_space_manager() != NULL) {
+    class_space_manager()->add_to_statistics(&out->sm_stats_nonclass);
+  }
+}
+
+#ifdef ASSERT
+void ClassLoaderMetaspace::verify(bool slow) const {
+  check_valid_spacetype(_space_type);
+  if (non_class_space_manager() != NULL) {
+    non_class_space_manager()->verify(slow);
+  }
+  if (class_space_manager() != NULL) {
+    class_space_manager()->verify(slow);
+  }
+}
+#endif // ASSERT
+
+} // end namespace metaspace
+
+
+
+