--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/memory/metaspace/virtualSpaceNode.hpp Mon May 21 11:33:59 2018 +0200
@@ -0,0 +1,169 @@
+/*
+ * 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_VIRTUALSPACENODE_HPP
+#define SHARE_MEMORY_METASPACE_VIRTUALSPACENODE_HPP
+
+#include "memory/virtualspace.hpp"
+#include "memory/memRegion.hpp"
+#include "utilities/debug.hpp"
+#include "utilities/globalDefinitions.hpp"
+
+class outputStream;
+
+namespace metaspace {
+
+class Metachunk;
+class ChunkManager;
+class OccupancyMap;
+
+// A VirtualSpaceList node.
+class VirtualSpaceNode : public CHeapObj<mtClass> {
+ friend class VirtualSpaceList;
+
+ // Link to next VirtualSpaceNode
+ VirtualSpaceNode* _next;
+
+ // Whether this node is contained in class or metaspace.
+ const bool _is_class;
+
+ // total in the VirtualSpace
+ MemRegion _reserved;
+ ReservedSpace _rs;
+ VirtualSpace _virtual_space;
+ MetaWord* _top;
+ // count of chunks contained in this VirtualSpace
+ uintx _container_count;
+
+ OccupancyMap* _occupancy_map;
+
+ // Convenience functions to access the _virtual_space
+ char* low() const { return virtual_space()->low(); }
+ char* high() const { return virtual_space()->high(); }
+
+ // The first Metachunk will be allocated at the bottom of the
+ // VirtualSpace
+ Metachunk* first_chunk() { return (Metachunk*) bottom(); }
+
+ // Committed but unused space in the virtual space
+ size_t free_words_in_vs() const;
+
+ // True if this node belongs to class metaspace.
+ bool is_class() const { return _is_class; }
+
+ // Helper function for take_from_committed: allocate padding chunks
+ // until top is at the given address.
+ void allocate_padding_chunks_until_top_is_at(MetaWord* target_top);
+
+ public:
+
+ VirtualSpaceNode(bool is_class, size_t byte_size);
+ VirtualSpaceNode(bool is_class, ReservedSpace rs) :
+ _is_class(is_class), _top(NULL), _next(NULL), _rs(rs), _container_count(0), _occupancy_map(NULL) {}
+ ~VirtualSpaceNode();
+
+ // Convenience functions for logical bottom and end
+ MetaWord* bottom() const { return (MetaWord*) _virtual_space.low(); }
+ MetaWord* end() const { return (MetaWord*) _virtual_space.high(); }
+
+ const OccupancyMap* occupancy_map() const { return _occupancy_map; }
+ OccupancyMap* occupancy_map() { return _occupancy_map; }
+
+ bool contains(const void* ptr) { return ptr >= low() && ptr < high(); }
+
+ size_t reserved_words() const { return _virtual_space.reserved_size() / BytesPerWord; }
+ size_t committed_words() const { return _virtual_space.actual_committed_size() / BytesPerWord; }
+
+ bool is_pre_committed() const { return _virtual_space.special(); }
+
+ // address of next available space in _virtual_space;
+ // Accessors
+ VirtualSpaceNode* next() { return _next; }
+ void set_next(VirtualSpaceNode* v) { _next = v; }
+
+ void set_reserved(MemRegion const v) { _reserved = v; }
+ void set_top(MetaWord* v) { _top = v; }
+
+ // Accessors
+ MemRegion* reserved() { return &_reserved; }
+ VirtualSpace* virtual_space() const { return (VirtualSpace*) &_virtual_space; }
+
+ // Returns true if "word_size" is available in the VirtualSpace
+ bool is_available(size_t word_size) { return word_size <= pointer_delta(end(), _top, sizeof(MetaWord)); }
+
+ MetaWord* top() const { return _top; }
+ void inc_top(size_t word_size) { _top += word_size; }
+
+ uintx container_count() { return _container_count; }
+ void inc_container_count();
+ void dec_container_count();
+#ifdef ASSERT
+ uintx container_count_slow();
+ void verify_container_count();
+#endif
+
+ // used and capacity in this single entry in the list
+ size_t used_words_in_vs() const;
+ size_t capacity_words_in_vs() const;
+
+ bool initialize();
+
+ // get space from the virtual space
+ Metachunk* take_from_committed(size_t chunk_word_size);
+
+ // Allocate a chunk from the virtual space and return it.
+ Metachunk* get_chunk_vs(size_t chunk_word_size);
+
+ // Expands/shrinks the committed space in a virtual space. Delegates
+ // to Virtualspace
+ bool expand_by(size_t min_words, size_t preferred_words);
+
+ // In preparation for deleting this node, remove all the chunks
+ // in the node from any freelist.
+ void purge(ChunkManager* chunk_manager);
+
+ // If an allocation doesn't fit in the current node a new node is created.
+ // Allocate chunks out of the remaining committed space in this node
+ // to avoid wasting that memory.
+ // This always adds up because all the chunk sizes are multiples of
+ // the smallest chunk size.
+ void retire(ChunkManager* chunk_manager);
+
+ void print_on(outputStream* st) const { print_on(st, K); }
+ void print_on(outputStream* st, size_t scale) const;
+ void print_map(outputStream* st, bool is_class) const;
+
+ // Debug support
+ DEBUG_ONLY(void mangle();)
+ // Verify counters, all chunks in this list node and the occupancy map.
+ DEBUG_ONLY(void verify();)
+ // Verify that all free chunks in this node are ideally merged
+ // (there not should be multiple small chunks where a large chunk could exist.)
+ DEBUG_ONLY(void verify_free_chunks_are_ideally_merged();)
+
+};
+
+} // namespace metaspace
+
+#endif /* SHARE_MEMORY_METASPACE_VIRTUALSPACENODE_HPP */