--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/spaceManager.hpp Mon May 21 11:33:59 2018 +0200
@@ -0,0 +1,234 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#ifndef SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP
+#define SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP
+
+#include "memory/allocation.hpp"
+#include "memory/metaspace.hpp"
+#include "memory/metaspace/blockFreelist.hpp"
+#include "memory/metaspace/metaspaceCommon.hpp"
+#include "memory/metaspace/metachunk.hpp"
+#include "memory/metaspace/metaspaceStatistics.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+class outputStream;
+class Mutex;
+
+namespace metaspace {
+
+// SpaceManager - used by Metaspace to handle allocations
+class SpaceManager : public CHeapObj<mtClass> {
+ friend class ::ClassLoaderMetaspace;
+ friend class Metadebug;
+
+ private:
+
+ // protects allocations
+ Mutex* const _lock;
+
+ // Type of metadata allocated.
+ const Metaspace::MetadataType _mdtype;
+
+ // Type of metaspace
+ const Metaspace::MetaspaceType _space_type;
+
+ // List of chunks in use by this SpaceManager. Allocations
+ // are done from the current chunk. The list is used for deallocating
+ // chunks when the SpaceManager is freed.
+ Metachunk* _chunk_list;
+ Metachunk* _current_chunk;
+
+ enum {
+
+ // Maximum number of small chunks to allocate to a SpaceManager
+ small_chunk_limit = 4,
+
+ // Maximum number of specialize chunks to allocate for anonymous and delegating
+ // metadata space to a SpaceManager
+ anon_and_delegating_metadata_specialize_chunk_limit = 4,
+
+ allocation_from_dictionary_limit = 4 * K
+
+ };
+
+ // Some running counters, but lets keep their number small to not add to much to
+ // the per-classloader footprint.
+ // Note: capacity = used + free + waste + overhead. We do not keep running counters for
+ // free and waste. Their sum can be deduced from the three other values.
+ size_t _overhead_words;
+ size_t _capacity_words;
+ size_t _used_words;
+ uintx _num_chunks_by_type[NumberOfInUseLists];
+
+ // Free lists of blocks are per SpaceManager since they
+ // are assumed to be in chunks in use by the SpaceManager
+ // and all chunks in use by a SpaceManager are freed when
+ // the class loader using the SpaceManager is collected.
+ BlockFreelist* _block_freelists;
+
+ private:
+ // Accessors
+ Metachunk* chunk_list() const { return _chunk_list; }
+
+ BlockFreelist* block_freelists() const { return _block_freelists; }
+
+ Metaspace::MetadataType mdtype() { return _mdtype; }
+
+ VirtualSpaceList* vs_list() const { return Metaspace::get_space_list(_mdtype); }
+ ChunkManager* chunk_manager() const { return Metaspace::get_chunk_manager(_mdtype); }
+
+ Metachunk* current_chunk() const { return _current_chunk; }
+ void set_current_chunk(Metachunk* v) {
+ _current_chunk = v;
+ }
+
+ Metachunk* find_current_chunk(size_t word_size);
+
+ // Add chunk to the list of chunks in use
+ void add_chunk(Metachunk* v, bool make_current);
+ void retire_current_chunk();
+
+ Mutex* lock() const { return _lock; }
+
+ // Adds to the given statistic object. Expects to be locked with lock().
+ void add_to_statistics_locked(SpaceManagerStatistics* out) const;
+
+ // Verify internal counters against the current state. Expects to be locked with lock().
+ DEBUG_ONLY(void verify_metrics_locked() const;)
+
+ public:
+ SpaceManager(Metaspace::MetadataType mdtype,
+ Metaspace::MetaspaceType space_type,
+ Mutex* lock);
+ ~SpaceManager();
+
+ enum ChunkMultiples {
+ MediumChunkMultiple = 4
+ };
+
+ static size_t specialized_chunk_size(bool is_class) { return is_class ? ClassSpecializedChunk : SpecializedChunk; }
+ static size_t small_chunk_size(bool is_class) { return is_class ? ClassSmallChunk : SmallChunk; }
+ static size_t medium_chunk_size(bool is_class) { return is_class ? ClassMediumChunk : MediumChunk; }
+
+ static size_t smallest_chunk_size(bool is_class) { return specialized_chunk_size(is_class); }
+
+ // Accessors
+ bool is_class() const { return _mdtype == Metaspace::ClassType; }
+
+ size_t specialized_chunk_size() const { return specialized_chunk_size(is_class()); }
+ size_t small_chunk_size() const { return small_chunk_size(is_class()); }
+ size_t medium_chunk_size() const { return medium_chunk_size(is_class()); }
+
+ size_t smallest_chunk_size() const { return smallest_chunk_size(is_class()); }
+
+ size_t medium_chunk_bunch() const { return medium_chunk_size() * MediumChunkMultiple; }
+
+ bool is_humongous(size_t word_size) { return word_size > medium_chunk_size(); }
+
+ size_t capacity_words() const { return _capacity_words; }
+ size_t used_words() const { return _used_words; }
+ size_t overhead_words() const { return _overhead_words; }
+
+ // Adjust local, global counters after a new chunk has been added.
+ void account_for_new_chunk(const Metachunk* new_chunk);
+
+ // Adjust local, global counters after space has been allocated from the current chunk.
+ void account_for_allocation(size_t words);
+
+ // Adjust global counters just before the SpaceManager dies, after all its chunks
+ // have been returned to the freelist.
+ void account_for_spacemanager_death();
+
+ // Adjust the initial chunk size to match one of the fixed chunk list sizes,
+ // or return the unadjusted size if the requested size is humongous.
+ static size_t adjust_initial_chunk_size(size_t requested, bool is_class_space);
+ size_t adjust_initial_chunk_size(size_t requested) const;
+
+ // Get the initial chunks size for this metaspace type.
+ size_t get_initial_chunk_size(Metaspace::MetaspaceType type) const;
+
+ // Todo: remove this once we have counters by chunk type.
+ uintx num_chunks_by_type(ChunkIndex chunk_type) const { return _num_chunks_by_type[chunk_type]; }
+
+ Metachunk* get_new_chunk(size_t chunk_word_size);
+
+ // Block allocation and deallocation.
+ // Allocates a block from the current chunk
+ MetaWord* allocate(size_t word_size);
+
+ // Helper for allocations
+ MetaWord* allocate_work(size_t word_size);
+
+ // Returns a block to the per manager freelist
+ void deallocate(MetaWord* p, size_t word_size);
+
+ // Based on the allocation size and a minimum chunk size,
+ // returned chunk size (for expanding space for chunk allocation).
+ size_t calc_chunk_size(size_t allocation_word_size);
+
+ // Called when an allocation from the current chunk fails.
+ // Gets a new chunk (may require getting a new virtual space),
+ // and allocates from that chunk.
+ MetaWord* grow_and_allocate(size_t word_size);
+
+ // Notify memory usage to MemoryService.
+ void track_metaspace_memory_usage();
+
+ // debugging support.
+
+ void print_on(outputStream* st) const;
+ void locked_print_chunks_in_use_on(outputStream* st) const;
+
+ void verify();
+ void verify_chunk_size(Metachunk* chunk);
+
+ // This adjusts the size given to be greater than the minimum allocation size in
+ // words for data in metaspace. Esentially the minimum size is currently 3 words.
+ size_t get_allocation_word_size(size_t word_size) {
+ size_t byte_size = word_size * BytesPerWord;
+
+ size_t raw_bytes_size = MAX2(byte_size, sizeof(Metablock));
+ raw_bytes_size = align_up(raw_bytes_size, Metachunk::object_alignment());
+
+ size_t raw_word_size = raw_bytes_size / BytesPerWord;
+ assert(raw_word_size * BytesPerWord == raw_bytes_size, "Size problem");
+
+ return raw_word_size;
+ }
+
+ // Adds to the given statistic object.
+ void add_to_statistics(SpaceManagerStatistics* out) const;
+
+ // Verify internal counters against the current state.
+ DEBUG_ONLY(void verify_metrics() const;)
+
+};
+
+
+} // namespace metaspace
+
+#endif /* SHARE_MEMORY_METASPACE_SPACEMANAGER_HPP */
+