author | pliden |
Mon, 18 Mar 2019 11:50:40 +0100 | |
changeset 54170 | 8f1771ea1e39 |
parent 54169 | 5748eae24183 |
child 54174 | 6d1caebf8d37 |
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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|
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#include "precompiled.hpp" |
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#include "gc/z/zAddress.inline.hpp" |
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#include "gc/z/zCollectedHeap.hpp" |
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#include "gc/z/zFuture.inline.hpp" |
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#include "gc/z/zGlobals.hpp" |
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#include "gc/z/zLock.inline.hpp" |
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#include "gc/z/zPage.inline.hpp" |
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#include "gc/z/zPageAllocator.hpp" |
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#include "gc/z/zPageCache.inline.hpp" |
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#include "gc/z/zPreMappedMemory.inline.hpp" |
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#include "gc/z/zStat.hpp" |
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#include "gc/z/zTracer.inline.hpp" |
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#include "runtime/init.hpp" |
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static const ZStatCounter ZCounterAllocationRate("Memory", "Allocation Rate", ZStatUnitBytesPerSecond); |
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static const ZStatCriticalPhase ZCriticalPhaseAllocationStall("Allocation Stall"); |
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class ZPageAllocRequest : public StackObj { |
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friend class ZList<ZPageAllocRequest>; |
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private: |
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const uint8_t _type; |
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const size_t _size; |
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const ZAllocationFlags _flags; |
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const unsigned int _total_collections; |
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ZListNode<ZPageAllocRequest> _node; |
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ZFuture<ZPage*> _result; |
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public: |
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ZPageAllocRequest(uint8_t type, size_t size, ZAllocationFlags flags, unsigned int total_collections) : |
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_type(type), |
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_size(size), |
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_flags(flags), |
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_total_collections(total_collections) {} |
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uint8_t type() const { |
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return _type; |
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} |
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size_t size() const { |
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return _size; |
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} |
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ZAllocationFlags flags() const { |
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return _flags; |
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} |
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unsigned int total_collections() const { |
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return _total_collections; |
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} |
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ZPage* wait() { |
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return _result.get(); |
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} |
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void satisfy(ZPage* page) { |
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_result.set(page); |
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} |
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}; |
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ZPage* const ZPageAllocator::gc_marker = (ZPage*)-1; |
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ZPageAllocator::ZPageAllocator(size_t min_capacity, size_t max_capacity, size_t max_reserve) : |
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_lock(), |
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_virtual(), |
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_physical(max_capacity), |
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_cache(), |
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_max_reserve(max_reserve), |
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_pre_mapped(_virtual, _physical, try_ensure_unused_for_pre_mapped(min_capacity)), |
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_used_high(0), |
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_used_low(0), |
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_used(0), |
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_allocated(0), |
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_reclaimed(0), |
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_queue(), |
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_detached() {} |
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bool ZPageAllocator::is_initialized() const { |
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return _physical.is_initialized() && |
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_virtual.is_initialized() && |
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_pre_mapped.is_initialized(); |
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} |
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size_t ZPageAllocator::max_capacity() const { |
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return _physical.max_capacity(); |
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} |
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size_t ZPageAllocator::current_max_capacity() const { |
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return _physical.current_max_capacity(); |
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} |
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size_t ZPageAllocator::capacity() const { |
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return _physical.capacity(); |
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} |
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|
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size_t ZPageAllocator::max_reserve() const { |
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return _max_reserve; |
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} |
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|
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size_t ZPageAllocator::used_high() const { |
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return _used_high; |
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} |
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|
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size_t ZPageAllocator::used_low() const { |
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return _used_low; |
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} |
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size_t ZPageAllocator::used() const { |
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return _used; |
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} |
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size_t ZPageAllocator::allocated() const { |
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return _allocated; |
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} |
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size_t ZPageAllocator::reclaimed() const { |
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return _reclaimed > 0 ? (size_t)_reclaimed : 0; |
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} |
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|
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void ZPageAllocator::reset_statistics() { |
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assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint"); |
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_allocated = 0; |
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_reclaimed = 0; |
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_used_high = _used_low = _used; |
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} |
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void ZPageAllocator::increase_used(size_t size, bool relocation) { |
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if (relocation) { |
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// Allocating a page for the purpose of relocation has a |
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// negative contribution to the number of reclaimed bytes. |
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_reclaimed -= size; |
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} |
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_allocated += size; |
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_used += size; |
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if (_used > _used_high) { |
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_used_high = _used; |
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} |
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} |
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|
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void ZPageAllocator::decrease_used(size_t size, bool reclaimed) { |
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if (reclaimed) { |
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// Only pages explicitly released with the reclaimed flag set |
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// counts as reclaimed bytes. This flag is typically true when |
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// a worker releases a page after relocation, and is typically |
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// false when we release a page to undo an allocation. |
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_reclaimed += size; |
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} |
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_used -= size; |
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if (_used < _used_low) { |
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_used_low = _used; |
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} |
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} |
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|
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size_t ZPageAllocator::max_available(bool no_reserve) const { |
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size_t available = current_max_capacity() - used(); |
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|
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if (no_reserve) { |
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// The reserve should not be considered available |
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available -= MIN2(available, max_reserve()); |
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} |
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return available; |
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} |
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|
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size_t ZPageAllocator::try_ensure_unused(size_t size, bool no_reserve) { |
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// Ensure that we always have space available for the reserve. This |
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// is needed to avoid losing the reserve because of failure to map |
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// more memory before reaching max capacity. |
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_physical.try_ensure_unused_capacity(size + max_reserve()); |
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|
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size_t unused = _physical.unused_capacity(); |
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|
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if (no_reserve) { |
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// The reserve should not be considered unused |
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unused -= MIN2(unused, max_reserve()); |
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} |
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|
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return MIN2(size, unused); |
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} |
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|
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size_t ZPageAllocator::try_ensure_unused_for_pre_mapped(size_t size) { |
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// This function is called during construction, where the |
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// physical memory manager might have failed to initialied. |
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if (!_physical.is_initialized()) { |
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return 0; |
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} |
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|
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return try_ensure_unused(size, true /* no_reserve */); |
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} |
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|
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ZPage* ZPageAllocator::create_page(uint8_t type, size_t size) { |
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// Allocate physical memory |
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const ZPhysicalMemory pmem = _physical.alloc(size); |
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if (pmem.is_null()) { |
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// Out of memory |
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return NULL; |
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} |
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|
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// Allocate virtual memory |
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const ZVirtualMemory vmem = _virtual.alloc(size); |
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if (vmem.is_null()) { |
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// Out of address space |
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_physical.free(pmem); |
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return NULL; |
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} |
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|
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// Allocate page |
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return new ZPage(type, vmem, pmem); |
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} |
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|
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void ZPageAllocator::flush_pre_mapped() { |
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if (_pre_mapped.available() == 0) { |
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return; |
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} |
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|
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// Detach the memory mapping. |
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detach_memory(_pre_mapped.virtual_memory(), _pre_mapped.physical_memory()); |
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|
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_pre_mapped.clear(); |
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} |
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|
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void ZPageAllocator::detach_page(ZPage* page) { |
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// Detach the memory mapping. |
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detach_memory(page->virtual_memory(), page->physical_memory()); |
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|
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// Add to list of detached pages |
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_detached.insert_last(page); |
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} |
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void ZPageAllocator::destroy_detached_pages() { |
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ZList<ZPage> list; |
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// Get and reset list of detached pages |
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{ |
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ZLocker<ZLock> locker(&_lock); |
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list.transfer(&_detached); |
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} |
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|
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// Destroy pages |
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for (ZPage* page = list.remove_first(); page != NULL; page = list.remove_first()) { |
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delete page; |
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} |
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} |
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void ZPageAllocator::map_page(ZPage* page) { |
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// Map physical memory |
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if (!page->is_mapped()) { |
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_physical.map(page->physical_memory(), page->start()); |
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} else if (ZVerifyViews) { |
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_physical.debug_map(page->physical_memory(), page->start()); |
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} |
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} |
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|
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void ZPageAllocator::unmap_all_pages() { |
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ZPhysicalMemory pmem(ZPhysicalMemorySegment(0 /* start */, ZAddressOffsetMax)); |
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_physical.debug_unmap(pmem, 0 /* offset */); |
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pmem.clear(); |
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} |
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void ZPageAllocator::flush_cache(size_t size) { |
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ZList<ZPage> list; |
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|
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_cache.flush(&list, size); |
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|
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for (ZPage* page = list.remove_first(); page != NULL; page = list.remove_first()) { |
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detach_page(page); |
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} |
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} |
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|
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void ZPageAllocator::check_out_of_memory_during_initialization() { |
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if (!is_init_completed()) { |
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vm_exit_during_initialization("java.lang.OutOfMemoryError", "Java heap too small"); |
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} |
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} |
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|
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ZPage* ZPageAllocator::alloc_page_common_inner(uint8_t type, size_t size, ZAllocationFlags flags) { |
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const size_t max = max_available(flags.no_reserve()); |
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if (max < size) { |
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// Not enough free memory |
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return NULL; |
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} |
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|
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// Try allocating from the page cache |
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ZPage* const cached_page = _cache.alloc_page(type, size); |
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if (cached_page != NULL) { |
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return cached_page; |
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} |
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|
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// Try allocate from the pre-mapped memory |
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ZPage* const pre_mapped_page = _pre_mapped.alloc_page(type, size); |
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if (pre_mapped_page != NULL) { |
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return pre_mapped_page; |
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} |
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|
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// Flush any remaining pre-mapped memory so that |
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// subsequent allocations can use the physical memory. |
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flush_pre_mapped(); |
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|
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// Try ensure that physical memory is available |
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const size_t unused = try_ensure_unused(size, flags.no_reserve()); |
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if (unused < size) { |
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// Flush cache to free up more physical memory |
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flush_cache(size - unused); |
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} |
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|
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// Create new page and allocate physical memory |
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return create_page(type, size); |
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} |
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|
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ZPage* ZPageAllocator::alloc_page_common(uint8_t type, size_t size, ZAllocationFlags flags) { |
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ZPage* const page = alloc_page_common_inner(type, size, flags); |
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if (page == NULL) { |
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// Out of memory |
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return NULL; |
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} |
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|
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// Update used statistics |
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increase_used(size, flags.relocation()); |
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|
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// Send trace event |
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ZTracer::tracer()->report_page_alloc(size, used(), max_available(flags.no_reserve()), _cache.available(), flags); |
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|
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return page; |
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} |
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|
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ZPage* ZPageAllocator::alloc_page_blocking(uint8_t type, size_t size, ZAllocationFlags flags) { |
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// Prepare to block |
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ZPageAllocRequest request(type, size, flags, ZCollectedHeap::heap()->total_collections()); |
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|
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_lock.lock(); |
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|
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// Try non-blocking allocation |
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|
356 |
ZPage* page = alloc_page_common(type, size, flags); |
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|
357 |
if (page == NULL) { |
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|
358 |
// Allocation failed, enqueue request |
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|
359 |
_queue.insert_last(&request); |
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|
360 |
} |
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|
361 |
|
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|
362 |
_lock.unlock(); |
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|
363 |
|
767cdb97f103
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diff
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|
364 |
if (page == NULL) { |
767cdb97f103
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|
365 |
// Allocation failed |
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|
366 |
ZStatTimer timer(ZCriticalPhaseAllocationStall); |
767cdb97f103
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|
367 |
|
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|
368 |
// We can only block if VM is fully initialized |
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|
369 |
check_out_of_memory_during_initialization(); |
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|
370 |
|
767cdb97f103
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|
371 |
do { |
767cdb97f103
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|
372 |
// Start asynchronous GC |
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|
373 |
ZCollectedHeap::heap()->collect(GCCause::_z_allocation_stall); |
767cdb97f103
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|
374 |
|
767cdb97f103
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|
375 |
// Wait for allocation to complete or fail |
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|
376 |
page = request.wait(); |
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|
377 |
} while (page == gc_marker); |
50581
0cc4711c2112
8205020: ZGC: Apply workaround for buggy sem_post() in glibc < 2.21
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|
378 |
|
0cc4711c2112
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|
379 |
{ |
0cc4711c2112
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|
380 |
// Guard deletion of underlying semaphore. This is a workaround for a |
0cc4711c2112
8205020: ZGC: Apply workaround for buggy sem_post() in glibc < 2.21
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|
381 |
// bug in sem_post() in glibc < 2.21, where it's not safe to destroy |
0cc4711c2112
8205020: ZGC: Apply workaround for buggy sem_post() in glibc < 2.21
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|
382 |
// the semaphore immediately after returning from sem_wait(). The |
0cc4711c2112
8205020: ZGC: Apply workaround for buggy sem_post() in glibc < 2.21
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|
383 |
// reason is that sem_post() can touch the semaphore after a waiting |
0cc4711c2112
8205020: ZGC: Apply workaround for buggy sem_post() in glibc < 2.21
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|
384 |
// thread have returned from sem_wait(). To avoid this race we are |
0cc4711c2112
8205020: ZGC: Apply workaround for buggy sem_post() in glibc < 2.21
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|
385 |
// forcing the waiting thread to acquire/release the lock held by the |
0cc4711c2112
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|
386 |
// posting thread. https://sourceware.org/bugzilla/show_bug.cgi?id=12674 |
52653 | 387 |
ZLocker<ZLock> locker(&_lock); |
50581
0cc4711c2112
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|
388 |
} |
50525
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|
389 |
} |
767cdb97f103
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|
390 |
|
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|
391 |
return page; |
767cdb97f103
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|
392 |
} |
767cdb97f103
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|
393 |
|
767cdb97f103
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|
394 |
ZPage* ZPageAllocator::alloc_page_nonblocking(uint8_t type, size_t size, ZAllocationFlags flags) { |
52653 | 395 |
ZLocker<ZLock> locker(&_lock); |
50525
767cdb97f103
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|
396 |
return alloc_page_common(type, size, flags); |
767cdb97f103
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|
397 |
} |
767cdb97f103
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|
398 |
|
767cdb97f103
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|
399 |
ZPage* ZPageAllocator::alloc_page(uint8_t type, size_t size, ZAllocationFlags flags) { |
767cdb97f103
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|
400 |
ZPage* const page = flags.non_blocking() |
767cdb97f103
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|
401 |
? alloc_page_nonblocking(type, size, flags) |
767cdb97f103
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|
402 |
: alloc_page_blocking(type, size, flags); |
767cdb97f103
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|
403 |
if (page == NULL) { |
767cdb97f103
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|
404 |
// Out of memory |
767cdb97f103
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|
405 |
return NULL; |
767cdb97f103
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|
406 |
} |
767cdb97f103
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|
407 |
|
767cdb97f103
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|
408 |
// Map page if needed |
54159
7c23a4432610
8220569: ZGC: Rename and rework ZUnmapBadViews to ZVerifyViews
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parents:
54094
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|
409 |
map_page(page); |
50525
767cdb97f103
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|
410 |
|
767cdb97f103
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|
411 |
// Reset page. This updates the page's sequence number and must |
767cdb97f103
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|
412 |
// be done after page allocation, which potentially blocked in |
767cdb97f103
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|
413 |
// a safepoint where the global sequence number was updated. |
767cdb97f103
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|
414 |
page->reset(); |
767cdb97f103
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|
415 |
|
767cdb97f103
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|
416 |
// Update allocation statistics. Exclude worker threads to avoid |
767cdb97f103
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|
417 |
// artificial inflation of the allocation rate due to relocation. |
767cdb97f103
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|
418 |
if (!flags.worker_thread()) { |
767cdb97f103
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|
419 |
// Note that there are two allocation rate counters, which have |
767cdb97f103
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|
420 |
// different purposes and are sampled at different frequencies. |
767cdb97f103
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|
421 |
const size_t bytes = page->size(); |
767cdb97f103
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|
422 |
ZStatInc(ZCounterAllocationRate, bytes); |
767cdb97f103
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|
423 |
ZStatInc(ZStatAllocRate::counter(), bytes); |
767cdb97f103
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|
424 |
} |
767cdb97f103
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diff
changeset
|
425 |
|
767cdb97f103
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|
426 |
return page; |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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diff
changeset
|
427 |
} |
767cdb97f103
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parents:
diff
changeset
|
428 |
|
767cdb97f103
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parents:
diff
changeset
|
429 |
void ZPageAllocator::satisfy_alloc_queue() { |
767cdb97f103
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parents:
diff
changeset
|
430 |
for (;;) { |
767cdb97f103
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|
431 |
ZPageAllocRequest* const request = _queue.first(); |
767cdb97f103
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|
432 |
if (request == NULL) { |
767cdb97f103
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parents:
diff
changeset
|
433 |
// Allocation queue is empty |
767cdb97f103
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parents:
diff
changeset
|
434 |
return; |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
435 |
} |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
436 |
|
767cdb97f103
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parents:
diff
changeset
|
437 |
ZPage* const page = alloc_page_common(request->type(), request->size(), request->flags()); |
767cdb97f103
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changeset
|
438 |
if (page == NULL) { |
767cdb97f103
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parents:
diff
changeset
|
439 |
// Allocation could not be satisfied, give up |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
440 |
return; |
767cdb97f103
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parents:
diff
changeset
|
441 |
} |
767cdb97f103
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parents:
diff
changeset
|
442 |
|
767cdb97f103
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parents:
diff
changeset
|
443 |
// Allocation succeeded, dequeue and satisfy request. Note that |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
444 |
// the dequeue operation must happen first, since the request |
767cdb97f103
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parents:
diff
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|
445 |
// will immediately be deallocated once it has been satisfied. |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
446 |
_queue.remove(request); |
767cdb97f103
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parents:
diff
changeset
|
447 |
request->satisfy(page); |
767cdb97f103
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parents:
diff
changeset
|
448 |
} |
767cdb97f103
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parents:
diff
changeset
|
449 |
} |
767cdb97f103
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parents:
diff
changeset
|
450 |
|
767cdb97f103
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parents:
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changeset
|
451 |
void ZPageAllocator::detach_memory(const ZVirtualMemory& vmem, ZPhysicalMemory& pmem) { |
767cdb97f103
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parents:
diff
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|
452 |
const uintptr_t addr = vmem.start(); |
767cdb97f103
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diff
changeset
|
453 |
|
54166
b9f030844be4
8220591: ZGC: Don't delay reclaimation of ZVirtualMemory
pliden
parents:
54162
diff
changeset
|
454 |
// Free virtual memory |
b9f030844be4
8220591: ZGC: Don't delay reclaimation of ZVirtualMemory
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parents:
54162
diff
changeset
|
455 |
_virtual.free(vmem); |
b9f030844be4
8220591: ZGC: Don't delay reclaimation of ZVirtualMemory
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parents:
54162
diff
changeset
|
456 |
|
50525
767cdb97f103
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changeset
|
457 |
// Unmap physical memory |
767cdb97f103
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|
458 |
_physical.unmap(pmem, addr); |
767cdb97f103
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parents:
diff
changeset
|
459 |
|
767cdb97f103
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parents:
diff
changeset
|
460 |
// Free physical memory |
767cdb97f103
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changeset
|
461 |
_physical.free(pmem); |
767cdb97f103
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parents:
diff
changeset
|
462 |
|
767cdb97f103
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parents:
diff
changeset
|
463 |
// Clear physical mapping |
767cdb97f103
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|
464 |
pmem.clear(); |
767cdb97f103
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changeset
|
465 |
} |
767cdb97f103
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parents:
diff
changeset
|
466 |
|
767cdb97f103
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parents:
diff
changeset
|
467 |
void ZPageAllocator::free_page(ZPage* page, bool reclaimed) { |
52653 | 468 |
ZLocker<ZLock> locker(&_lock); |
50525
767cdb97f103
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parents:
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changeset
|
469 |
|
767cdb97f103
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parents:
diff
changeset
|
470 |
// Update used statistics |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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diff
changeset
|
471 |
decrease_used(page->size(), reclaimed); |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
472 |
|
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
473 |
// Cache page |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
diff
changeset
|
474 |
_cache.free_page(page); |
767cdb97f103
8204210: Implementation: JEP 333: ZGC: A Scalable Low-Latency Garbage Collector (Experimental)
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parents:
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475 |
|
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476 |
// Try satisfy blocked allocations |
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477 |
satisfy_alloc_queue(); |
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|
478 |
} |
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479 |
|
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8205022: ZGC: SoftReferences not always cleared before throwing OOME
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480 |
bool ZPageAllocator::is_alloc_stalled() const { |
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481 |
assert(SafepointSynchronize::is_at_safepoint(), "Should be at safepoint"); |
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482 |
return !_queue.is_empty(); |
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483 |
} |
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484 |
|
50525
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485 |
void ZPageAllocator::check_out_of_memory() { |
52653 | 486 |
ZLocker<ZLock> locker(&_lock); |
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487 |
|
50582
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8205022: ZGC: SoftReferences not always cleared before throwing OOME
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488 |
// Fail allocation requests that were enqueued before the |
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489 |
// last GC cycle started, otherwise start a new GC cycle. |
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490 |
for (ZPageAllocRequest* request = _queue.first(); request != NULL; request = _queue.first()) { |
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491 |
if (request->total_collections() == ZCollectedHeap::heap()->total_collections()) { |
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492 |
// Start a new GC cycle, keep allocation requests enqueued |
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493 |
request->satisfy(gc_marker); |
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494 |
return; |
50525
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495 |
} |
50582
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|
496 |
|
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|
497 |
// Out of memory, fail allocation request |
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|
498 |
_queue.remove_first(); |
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|
499 |
request->satisfy(NULL); |
50525
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|
500 |
} |
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|
501 |
} |