author | eosterlund |
Tue, 24 Sep 2019 10:04:13 +0000 | |
changeset 58287 | a7f16447085e |
parent 54834 | 39ba09047e19 |
child 58468 | 97cd0aa39787 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2019, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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#include "precompiled.hpp" |
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#include "gc/z/zGlobals.hpp" |
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#include "gc/z/zVirtualMemory.inline.hpp" |
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#include "logging/log.hpp" |
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#include "services/memTracker.hpp" |
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ZVirtualMemoryManager::ZVirtualMemoryManager(size_t max_capacity) : |
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_manager(), |
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_initialized(false) { |
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log_info(gc, init)("Address Space: " SIZE_FORMAT "T", ZAddressOffsetMax / K / G); |
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// Reserve address space |
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if (reserve(0, ZAddressOffsetMax) < max_capacity) { |
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log_error(gc)("Failed to reserve address space for Java heap"); |
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return; |
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} |
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// Successfully initialized |
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_initialized = true; |
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} |
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size_t ZVirtualMemoryManager::reserve(uintptr_t start, size_t size) { |
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if (size < ZGranuleSize) { |
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// Too small |
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return 0; |
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} |
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if (!reserve_platform(start, size)) { |
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const size_t half = size / 2; |
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return reserve(start, half) + reserve(start + half, half); |
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} |
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// Make the address range free |
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_manager.free(start, size); |
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return size; |
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} |
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void ZVirtualMemoryManager::nmt_reserve(uintptr_t start, size_t size) { |
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MemTracker::record_virtual_memory_reserve((void*)start, size, CALLER_PC); |
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MemTracker::record_virtual_memory_type((void*)start, mtJavaHeap); |
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} |
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bool ZVirtualMemoryManager::is_initialized() const { |
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return _initialized; |
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} |
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ZVirtualMemory ZVirtualMemoryManager::alloc(size_t size, bool alloc_from_front) { |
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uintptr_t start; |
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if (alloc_from_front || size <= ZPageSizeSmall) { |
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// Small page |
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start = _manager.alloc_from_front(size); |
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} else { |
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// Medium/Large page |
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start = _manager.alloc_from_back(size); |
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} |
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return ZVirtualMemory(start, size); |
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} |
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void ZVirtualMemoryManager::free(const ZVirtualMemory& vmem) { |
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_manager.free(vmem.start(), vmem.size()); |
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} |