author | pliden |
Mon, 18 Mar 2019 11:50:40 +0100 | |
changeset 54170 | 8f1771ea1e39 |
parent 50525 | 767cdb97f103 |
child 54834 | 39ba09047e19 |
permissions | -rw-r--r-- |
50525
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/* |
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* Copyright (c) 2015, 2017, 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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|
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#include "precompiled.hpp" |
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#include "gc/z/zList.inline.hpp" |
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#include "gc/z/zMemory.inline.hpp" |
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#include "memory/allocation.inline.hpp" |
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|
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uintptr_t ZMemoryManager::alloc_from_front(size_t size) { |
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ZListIterator<ZMemory> iter(&_freelist); |
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for (ZMemory* area; iter.next(&area);) { |
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if (area->size() >= size) { |
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if (area->size() == size) { |
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// Exact match, remove area |
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const uintptr_t start = area->start(); |
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_freelist.remove(area); |
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delete area; |
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return start; |
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} else { |
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// Larger than requested, shrink area |
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const uintptr_t start = area->start(); |
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area->shrink_from_front(size); |
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return start; |
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} |
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} |
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} |
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|
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// Out of memory |
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return UINTPTR_MAX; |
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} |
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uintptr_t ZMemoryManager::alloc_from_back(size_t size) { |
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ZListReverseIterator<ZMemory> iter(&_freelist); |
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for (ZMemory* area; iter.next(&area);) { |
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if (area->size() >= size) { |
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if (area->size() == size) { |
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// Exact match, remove area |
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const uintptr_t start = area->start(); |
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_freelist.remove(area); |
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delete area; |
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return start; |
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} else { |
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// Larger than requested, shrink area |
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area->shrink_from_back(size); |
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return area->end(); |
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} |
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} |
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} |
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|
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// Out of memory |
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return UINTPTR_MAX; |
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} |
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void ZMemoryManager::free(uintptr_t start, size_t size) { |
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assert(start != UINTPTR_MAX, "Invalid address"); |
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const uintptr_t end = start + size; |
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|
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ZListIterator<ZMemory> iter(&_freelist); |
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for (ZMemory* area; iter.next(&area);) { |
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if (start < area->start()) { |
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ZMemory* const prev = _freelist.prev(area); |
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if (prev != NULL && start == prev->end()) { |
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if (end == area->start()) { |
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// Merge with prev and current area |
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prev->grow_from_back(size + area->size()); |
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_freelist.remove(area); |
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delete area; |
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} else { |
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// Merge with prev area |
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prev->grow_from_back(size); |
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} |
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} else if (end == area->start()) { |
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// Merge with current area |
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area->grow_from_front(size); |
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} else { |
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// Insert new area before current area |
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assert(end < area->start(), "Areas must not overlap"); |
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ZMemory* new_area = new ZMemory(start, size); |
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_freelist.insert_before(area, new_area); |
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} |
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// Done |
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return; |
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} |
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} |
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|
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// Insert last |
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ZMemory* const last = _freelist.last(); |
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if (last != NULL && start == last->end()) { |
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// Merge with last area |
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last->grow_from_back(size); |
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} else { |
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// Insert new area last |
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ZMemory* new_area = new ZMemory(start, size); |
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_freelist.insert_last(new_area); |
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} |
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8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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