1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_MEMORY_NODE_MANAGER_HPP
  26 #define SHARE_VM_GC_G1_MEMORY_NODE_MANAGER_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "runtime/os.hpp"
  30 
  31 // Helper class to manage memory nodes.
  32 // G1MemoryMultiNodeManager will be created if UseNUMA is enabled and active
  33 // NUMA nodes are more than one. Otherwise, G1MemoryNodeManager will be created.
  34 class G1MemoryNodeManager : public CHeapObj<mtGC> {
  35   static G1MemoryNodeManager* _inst;
  36 
  37 public:
  38   static const uint InvalidNodeIndex = (uint)os::InvalidId;
  39   static const uint AnyNodeIndex = (uint)os::AnyId;
  40 
  41   static G1MemoryNodeManager* mgr() { return _inst; }
  42 
  43   static G1MemoryNodeManager* create();
  44 
  45   virtual ~G1MemoryNodeManager() { }
  46 
  47   // Set page size of Java Heap.
  48   virtual void set_page_size(size_t page_size) { }
  49 
  50   // Print current active memory node count.
  51   virtual uint num_active_nodes() const { return 1; }
  52 
  53   // Returns memory node ids
  54   virtual const int* node_ids() const { static int dummy_id = 0; return &dummy_id; }
  55 
  56   virtual uint index_of_current_thread() const { return 0; }
  57 
  58   // If the given node index is valid return same index,
  59   // If it is not valid, generate valid random index.
  60   virtual uint valid_node_index(uint node_index) const { return 0; }
  61 
  62   virtual bool is_valid_node_index(uint node_index) const {
  63     // Single node index should be always 0.
  64     return node_index == 0;
  65   }
  66 
  67   // Retrieve node index of the given address.
  68   virtual uint index_of_address(HeapWord* addr) const { return 0; }
  69 };
  70 
  71 #endif // SHARE_VM_GC_G1_MEMORY_NODE_MANAGER_HPP