| /* |
| * Copyright (c) 2017, 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_VM_JFR_RECORDER_STORAGE_JFRVIRTUALMEMORY_HPP |
| #define SHARE_VM_JFR_RECORDER_STORAGE_JFRVIRTUALMEMORY_HPP |
| |
| #include "jfr/utilities/jfrAllocation.hpp" |
| |
| class JfrVirtualMemoryManager; |
| |
| class JfrVirtualMemory : public JfrCHeapObj { |
| private: |
| JfrVirtualMemoryManager* _vmm; |
| const u1* _reserved_low; // lowest address of reservation |
| const u1* _reserved_high; // highest address of reservation |
| u1* _top; // current allocation address |
| const u1* _commit_point; // synch points for committing new memory |
| size_t _physical_commit_size_request_words; // aligned to os::vm_allocation_granularity() |
| size_t _aligned_datum_size_bytes; // datum alignment |
| |
| bool commit_memory_block(); |
| void* commit(size_t block_size_request_words); |
| void* index_ptr(size_t index); // index to address map |
| |
| public: |
| JfrVirtualMemory(); |
| ~JfrVirtualMemory(); |
| |
| // initialization will do the reservation and return it |
| void* initialize(size_t reservation_size_request_bytes, size_t block_size_request_bytes, size_t datum_size_bytes = 1); |
| |
| void* new_datum(); // datum oriented allocation |
| void* get(size_t index); // direct access retrieval |
| size_t aligned_datum_size_bytes() const; |
| |
| bool is_full() const; // limit of reservation committed and in use |
| bool is_empty() const; |
| |
| size_t count() const; // how many |
| size_t live_set() const; // how much resident memory (actually in use) |
| size_t reserved_size() const; // size of reservation |
| bool compact(size_t index); |
| }; |
| |
| #endif // SHARE_VM_JFR_RECORDER_STORAGE_JFRVIRTUALMEMORY_HPP |