author | pliden |
Mon, 18 Mar 2019 11:50:40 +0100 | |
changeset 54170 | 8f1771ea1e39 |
parent 54159 | 7c23a4432610 |
child 54834 | 39ba09047e19 |
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/zPhysicalMemory.inline.hpp" |
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#include "logging/log.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "services/memTracker.hpp" |
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#include "utilities/debug.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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ZPhysicalMemory::ZPhysicalMemory() : |
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_nsegments(0), |
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_segments(NULL) {} |
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ZPhysicalMemory::ZPhysicalMemory(size_t size) : |
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_nsegments(0), |
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_segments(NULL) { |
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add_segment(ZPhysicalMemorySegment(0, size)); |
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} |
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ZPhysicalMemory::ZPhysicalMemory(const ZPhysicalMemorySegment& segment) : |
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_nsegments(0), |
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_segments(NULL) { |
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add_segment(segment); |
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} |
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size_t ZPhysicalMemory::size() const { |
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size_t size = 0; |
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|
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for (size_t i = 0; i < _nsegments; i++) { |
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size += _segments[i].size(); |
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} |
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return size; |
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} |
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void ZPhysicalMemory::add_segment(ZPhysicalMemorySegment segment) { |
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// Try merge with last segment |
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if (_nsegments > 0) { |
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ZPhysicalMemorySegment& last = _segments[_nsegments - 1]; |
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assert(last.end() <= segment.start(), "Segments added out of order"); |
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if (last.end() == segment.start()) { |
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// Merge |
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last.expand(segment.size()); |
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return; |
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} |
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} |
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// Make room for a new segment |
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const size_t size = sizeof(ZPhysicalMemorySegment) * (_nsegments + 1); |
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_segments = (ZPhysicalMemorySegment*)ReallocateHeap((char*)_segments, size, mtGC); |
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// Add new segment |
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_segments[_nsegments] = segment; |
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_nsegments++; |
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} |
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ZPhysicalMemory ZPhysicalMemory::split(size_t split_size) { |
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// Only splitting of single-segment instances have been implemented. |
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assert(nsegments() == 1, "Can only have one segment"); |
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assert(split_size <= size(), "Invalid size"); |
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return ZPhysicalMemory(_segments[0].split(split_size)); |
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} |
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void ZPhysicalMemory::clear() { |
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if (_segments != NULL) { |
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FreeHeap(_segments); |
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_segments = NULL; |
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_nsegments = 0; |
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} |
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} |
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ZPhysicalMemoryManager::ZPhysicalMemoryManager(size_t max_capacity) : |
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_backing(max_capacity), |
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_max_capacity(max_capacity), |
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_current_max_capacity(max_capacity), |
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_capacity(0), |
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_used(0) {} |
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bool ZPhysicalMemoryManager::is_initialized() const { |
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return _backing.is_initialized(); |
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} |
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void ZPhysicalMemoryManager::try_ensure_unused_capacity(size_t size) { |
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const size_t unused = unused_capacity(); |
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if (unused >= size) { |
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// Don't try to expand, enough unused capacity available |
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return; |
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} |
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const size_t current_max = current_max_capacity(); |
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if (_capacity == current_max) { |
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// Don't try to expand, current max capacity reached |
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return; |
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} |
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// Try to expand |
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const size_t old_capacity = capacity(); |
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const size_t new_capacity = MIN2(old_capacity + size - unused, current_max); |
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_capacity = _backing.try_expand(old_capacity, new_capacity); |
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if (_capacity != new_capacity) { |
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// Failed, or partly failed, to expand |
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log_error(gc, init)("Not enough space available on the backing filesystem to hold the current max"); |
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log_error(gc, init)("Java heap size (" SIZE_FORMAT "M). Forcefully lowering max Java heap size to " |
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SIZE_FORMAT "M (%.0lf%%).", current_max / M, _capacity / M, |
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percent_of(_capacity, current_max)); |
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|
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// Adjust current max capacity to avoid further expand attempts |
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_current_max_capacity = _capacity; |
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} |
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} |
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|
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void ZPhysicalMemoryManager::nmt_commit(ZPhysicalMemory pmem, uintptr_t offset) { |
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const uintptr_t addr = _backing.nmt_address(offset); |
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const size_t size = pmem.size(); |
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MemTracker::record_virtual_memory_commit((void*)addr, size, CALLER_PC); |
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} |
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|
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void ZPhysicalMemoryManager::nmt_uncommit(ZPhysicalMemory pmem, uintptr_t offset) { |
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if (MemTracker::tracking_level() > NMT_minimal) { |
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const uintptr_t addr = _backing.nmt_address(offset); |
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const size_t size = pmem.size(); |
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|
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Tracker tracker(Tracker::uncommit); |
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tracker.record((address)addr, size); |
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} |
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} |
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|
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ZPhysicalMemory ZPhysicalMemoryManager::alloc(size_t size) { |
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if (unused_capacity() < size) { |
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// Not enough memory available |
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return ZPhysicalMemory(); |
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} |
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|
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_used += size; |
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return _backing.alloc(size); |
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} |
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void ZPhysicalMemoryManager::free(ZPhysicalMemory pmem) { |
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_backing.free(pmem); |
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_used -= pmem.size(); |
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} |
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|
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void ZPhysicalMemoryManager::map(ZPhysicalMemory pmem, uintptr_t offset) { |
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// Map page |
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_backing.map(pmem, offset); |
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|
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// Update native memory tracker |
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nmt_commit(pmem, offset); |
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} |
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void ZPhysicalMemoryManager::unmap(ZPhysicalMemory pmem, uintptr_t offset) { |
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// Update native memory tracker |
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nmt_uncommit(pmem, offset); |
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// Unmap page |
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_backing.unmap(pmem, offset); |
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} |
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void ZPhysicalMemoryManager::debug_map(ZPhysicalMemory pmem, uintptr_t offset) { |
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_backing.debug_map(pmem, offset); |
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} |
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void ZPhysicalMemoryManager::debug_unmap(ZPhysicalMemory pmem, uintptr_t offset) { |
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_backing.debug_unmap(pmem, offset); |
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} |