author | tschatzl |
Tue, 29 May 2018 09:26:00 +0200 | |
changeset 50605 | 7f63c74f0974 |
parent 50513 | 7f166e010af4 |
child 50954 | f85092465b0c |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2018, 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/shared/oopStorage.inline.hpp" |
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#include "gc/shared/oopStorageParState.inline.hpp" |
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#include "logging/log.hpp" |
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#include "logging/logStream.hpp" |
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#include "memory/allocation.inline.hpp" |
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#include "runtime/atomic.hpp" |
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#include "runtime/globals.hpp" |
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#include "runtime/handles.inline.hpp" |
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#include "runtime/mutex.hpp" |
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#include "runtime/mutexLocker.hpp" |
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#include "runtime/orderAccess.hpp" |
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#include "runtime/safepoint.hpp" |
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#include "runtime/stubRoutines.hpp" |
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#include "runtime/thread.hpp" |
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#include "utilities/align.hpp" |
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#include "utilities/count_trailing_zeros.hpp" |
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#include "utilities/debug.hpp" |
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#include "utilities/globalDefinitions.hpp" |
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#include "utilities/macros.hpp" |
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#include "utilities/ostream.hpp" |
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#include "utilities/spinYield.hpp" |
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OopStorage::AllocateEntry::AllocateEntry() : _prev(NULL), _next(NULL) {} |
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OopStorage::AllocateEntry::~AllocateEntry() { |
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assert(_prev == NULL, "deleting attached block"); |
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assert(_next == NULL, "deleting attached block"); |
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} |
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OopStorage::AllocateList::AllocateList() : _head(NULL), _tail(NULL) {} |
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OopStorage::AllocateList::~AllocateList() { |
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// ~OopStorage() empties its lists before destroying them. |
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assert(_head == NULL, "deleting non-empty block list"); |
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assert(_tail == NULL, "deleting non-empty block list"); |
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} |
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void OopStorage::AllocateList::push_front(const Block& block) { |
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const Block* old = _head; |
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if (old == NULL) { |
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assert(_tail == NULL, "invariant"); |
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_head = _tail = █ |
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} else { |
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block.allocate_entry()._next = old; |
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old->allocate_entry()._prev = █ |
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_head = █ |
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} |
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} |
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void OopStorage::AllocateList::push_back(const Block& block) { |
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const Block* old = _tail; |
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if (old == NULL) { |
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assert(_head == NULL, "invariant"); |
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_head = _tail = █ |
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} else { |
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old->allocate_entry()._next = █ |
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block.allocate_entry()._prev = old; |
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_tail = █ |
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} |
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} |
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void OopStorage::AllocateList::unlink(const Block& block) { |
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const AllocateEntry& block_entry = block.allocate_entry(); |
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const Block* prev_blk = block_entry._prev; |
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const Block* next_blk = block_entry._next; |
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block_entry._prev = NULL; |
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block_entry._next = NULL; |
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if ((prev_blk == NULL) && (next_blk == NULL)) { |
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assert(_head == &block, "invariant"); |
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assert(_tail == &block, "invariant"); |
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_head = _tail = NULL; |
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} else if (prev_blk == NULL) { |
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assert(_head == &block, "invariant"); |
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next_blk->allocate_entry()._prev = NULL; |
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_head = next_blk; |
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} else if (next_blk == NULL) { |
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assert(_tail == &block, "invariant"); |
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prev_blk->allocate_entry()._next = NULL; |
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_tail = prev_blk; |
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} else { |
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next_blk->allocate_entry()._prev = prev_blk; |
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prev_blk->allocate_entry()._next = next_blk; |
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} |
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} |
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OopStorage::ActiveArray::ActiveArray(size_t size) : |
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_size(size), |
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_block_count(0), |
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_refcount(0) |
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{} |
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OopStorage::ActiveArray::~ActiveArray() { |
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assert(_refcount == 0, "precondition"); |
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} |
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OopStorage::ActiveArray* OopStorage::ActiveArray::create(size_t size, AllocFailType alloc_fail) { |
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size_t size_in_bytes = blocks_offset() + sizeof(Block*) * size; |
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void* mem = NEW_C_HEAP_ARRAY3(char, size_in_bytes, mtGC, CURRENT_PC, alloc_fail); |
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if (mem == NULL) return NULL; |
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return new (mem) ActiveArray(size); |
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} |
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void OopStorage::ActiveArray::destroy(ActiveArray* ba) { |
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ba->~ActiveArray(); |
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FREE_C_HEAP_ARRAY(char, ba); |
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} |
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size_t OopStorage::ActiveArray::size() const { |
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return _size; |
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} |
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size_t OopStorage::ActiveArray::block_count() const { |
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return _block_count; |
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} |
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size_t OopStorage::ActiveArray::block_count_acquire() const { |
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return OrderAccess::load_acquire(&_block_count); |
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} |
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void OopStorage::ActiveArray::increment_refcount() const { |
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int new_value = Atomic::add(1, &_refcount); |
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assert(new_value >= 1, "negative refcount %d", new_value - 1); |
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} |
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bool OopStorage::ActiveArray::decrement_refcount() const { |
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int new_value = Atomic::sub(1, &_refcount); |
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assert(new_value >= 0, "negative refcount %d", new_value); |
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return new_value == 0; |
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} |
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bool OopStorage::ActiveArray::push(Block* block) { |
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size_t index = _block_count; |
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if (index < _size) { |
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block->set_active_index(index); |
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*block_ptr(index) = block; |
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// Use a release_store to ensure all the setup is complete before |
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// making the block visible. |
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OrderAccess::release_store(&_block_count, index + 1); |
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return true; |
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} else { |
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return false; |
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} |
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} |
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void OopStorage::ActiveArray::remove(Block* block) { |
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assert(_block_count > 0, "array is empty"); |
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size_t index = block->active_index(); |
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assert(*block_ptr(index) == block, "block not present"); |
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size_t last_index = _block_count - 1; |
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Block* last_block = *block_ptr(last_index); |
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last_block->set_active_index(index); |
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*block_ptr(index) = last_block; |
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_block_count = last_index; |
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} |
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void OopStorage::ActiveArray::copy_from(const ActiveArray* from) { |
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assert(_block_count == 0, "array must be empty"); |
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size_t count = from->_block_count; |
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assert(count <= _size, "precondition"); |
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Block* const* from_ptr = from->block_ptr(0); |
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Block** to_ptr = block_ptr(0); |
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for (size_t i = 0; i < count; ++i) { |
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Block* block = *from_ptr++; |
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assert(block->active_index() == i, "invariant"); |
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*to_ptr++ = block; |
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} |
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_block_count = count; |
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} |
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// Blocks start with an array of BitsPerWord oop entries. That array |
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// is divided into conceptual BytesPerWord sections of BitsPerByte |
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// entries. Blocks are allocated aligned on section boundaries, for |
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// the convenience of mapping from an entry to the containing block; |
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// see block_for_ptr(). Aligning on section boundary rather than on |
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// the full _data wastes a lot less space, but makes for a bit more |
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// work in block_for_ptr(). |
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202 |
|
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const unsigned section_size = BitsPerByte; |
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const unsigned section_count = BytesPerWord; |
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const unsigned block_alignment = sizeof(oop) * section_size; |
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OopStorage::Block::Block(const OopStorage* owner, void* memory) : |
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_data(), |
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_allocated_bitmask(0), |
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_owner(owner), |
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_memory(memory), |
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_active_index(0), |
48886 | 213 |
_allocate_entry(), |
214 |
_deferred_updates_next(NULL), |
|
215 |
_release_refcount(0) |
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{ |
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STATIC_ASSERT(_data_pos == 0); |
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STATIC_ASSERT(section_size * section_count == ARRAY_SIZE(_data)); |
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assert(offset_of(Block, _data) == _data_pos, "invariant"); |
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assert(owner != NULL, "NULL owner"); |
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assert(is_aligned(this, block_alignment), "misaligned block"); |
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222 |
} |
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223 |
|
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OopStorage::Block::~Block() { |
48886 | 225 |
assert(_release_refcount == 0, "deleting block while releasing"); |
226 |
assert(_deferred_updates_next == NULL, "deleting block with deferred update"); |
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// Clear fields used by block_for_ptr and entry validation, which |
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// might help catch bugs. Volatile to prevent dead-store elimination. |
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const_cast<uintx volatile&>(_allocated_bitmask) = 0; |
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const_cast<OopStorage* volatile&>(_owner) = NULL; |
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231 |
} |
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232 |
|
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size_t OopStorage::Block::allocation_size() { |
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// _data must be first member, so aligning Block aligns _data. |
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STATIC_ASSERT(_data_pos == 0); |
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return sizeof(Block) + block_alignment - sizeof(void*); |
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} |
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238 |
|
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size_t OopStorage::Block::allocation_alignment_shift() { |
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return exact_log2(block_alignment); |
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241 |
} |
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242 |
|
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inline bool is_full_bitmask(uintx bitmask) { return ~bitmask == 0; } |
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inline bool is_empty_bitmask(uintx bitmask) { return bitmask == 0; } |
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|
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bool OopStorage::Block::is_full() const { |
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return is_full_bitmask(allocated_bitmask()); |
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248 |
} |
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249 |
|
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bool OopStorage::Block::is_empty() const { |
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return is_empty_bitmask(allocated_bitmask()); |
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252 |
} |
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253 |
|
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uintx OopStorage::Block::bitmask_for_entry(const oop* ptr) const { |
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return bitmask_for_index(get_index(ptr)); |
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256 |
} |
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257 |
|
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// A block is deletable if |
259 |
// (1) It is empty. |
|
260 |
// (2) There is not a release() operation currently operating on it. |
|
261 |
// (3) It is not in the deferred updates list. |
|
262 |
// The order of tests is important for proper interaction between release() |
|
263 |
// and concurrent deletion. |
|
264 |
bool OopStorage::Block::is_deletable() const { |
|
265 |
return (OrderAccess::load_acquire(&_allocated_bitmask) == 0) && |
|
266 |
(OrderAccess::load_acquire(&_release_refcount) == 0) && |
|
267 |
(OrderAccess::load_acquire(&_deferred_updates_next) == NULL); |
|
268 |
} |
|
269 |
||
270 |
OopStorage::Block* OopStorage::Block::deferred_updates_next() const { |
|
271 |
return _deferred_updates_next; |
|
272 |
} |
|
273 |
||
274 |
void OopStorage::Block::set_deferred_updates_next(Block* block) { |
|
275 |
_deferred_updates_next = block; |
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} |
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bool OopStorage::Block::contains(const oop* ptr) const { |
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const oop* base = get_pointer(0); |
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return (base <= ptr) && (ptr < (base + ARRAY_SIZE(_data))); |
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} |
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282 |
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283 |
size_t OopStorage::Block::active_index() const { |
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284 |
return _active_index; |
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285 |
} |
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286 |
|
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287 |
void OopStorage::Block::set_active_index(size_t index) { |
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_active_index = index; |
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289 |
} |
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290 |
|
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291 |
size_t OopStorage::Block::active_index_safe(const Block* block) { |
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STATIC_ASSERT(sizeof(intptr_t) == sizeof(block->_active_index)); |
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293 |
assert(CanUseSafeFetchN(), "precondition"); |
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294 |
return SafeFetchN((intptr_t*)&block->_active_index, 0); |
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295 |
} |
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296 |
|
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297 |
unsigned OopStorage::Block::get_index(const oop* ptr) const { |
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298 |
assert(contains(ptr), PTR_FORMAT " not in block " PTR_FORMAT, p2i(ptr), p2i(this)); |
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299 |
return static_cast<unsigned>(ptr - get_pointer(0)); |
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300 |
} |
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|
301 |
|
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302 |
oop* OopStorage::Block::allocate() { |
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|
303 |
// Use CAS loop because release may change bitmask outside of lock. |
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304 |
uintx allocated = allocated_bitmask(); |
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|
305 |
while (true) { |
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|
306 |
assert(!is_full_bitmask(allocated), "attempt to allocate from full block"); |
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|
307 |
unsigned index = count_trailing_zeros(~allocated); |
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|
308 |
uintx new_value = allocated | bitmask_for_index(index); |
48886 | 309 |
uintx fetched = Atomic::cmpxchg(new_value, &_allocated_bitmask, allocated); |
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310 |
if (fetched == allocated) { |
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311 |
return get_pointer(index); // CAS succeeded; return entry for index. |
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|
312 |
} |
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313 |
allocated = fetched; // CAS failed; retry with latest value. |
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|
314 |
} |
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|
315 |
} |
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|
316 |
|
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317 |
OopStorage::Block* OopStorage::Block::new_block(const OopStorage* owner) { |
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|
318 |
// _data must be first member: aligning block => aligning _data. |
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|
319 |
STATIC_ASSERT(_data_pos == 0); |
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320 |
size_t size_needed = allocation_size(); |
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|
321 |
void* memory = NEW_C_HEAP_ARRAY_RETURN_NULL(char, size_needed, mtGC); |
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|
322 |
if (memory == NULL) { |
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|
323 |
return NULL; |
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|
324 |
} |
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|
325 |
void* block_mem = align_up(memory, block_alignment); |
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|
326 |
assert(sizeof(Block) + pointer_delta(block_mem, memory, 1) <= size_needed, |
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|
327 |
"allocated insufficient space for aligned block"); |
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|
328 |
return ::new (block_mem) Block(owner, memory); |
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|
329 |
} |
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|
330 |
|
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|
331 |
void OopStorage::Block::delete_block(const Block& block) { |
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|
332 |
void* memory = block._memory; |
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|
333 |
block.Block::~Block(); |
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|
334 |
FREE_C_HEAP_ARRAY(char, memory); |
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|
335 |
} |
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|
336 |
|
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|
337 |
// This can return a false positive if ptr is not contained by some |
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|
338 |
// block. For some uses, it is a precondition that ptr is valid, |
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// e.g. contained in some block in owner's _active_array. Other uses |
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|
340 |
// require additional validation of the result. |
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|
341 |
OopStorage::Block* |
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|
342 |
OopStorage::Block::block_for_ptr(const OopStorage* owner, const oop* ptr) { |
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|
343 |
assert(CanUseSafeFetchN(), "precondition"); |
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|
344 |
STATIC_ASSERT(_data_pos == 0); |
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|
345 |
// Const-ness of ptr is not related to const-ness of containing block. |
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|
346 |
// Blocks are allocated section-aligned, so get the containing section. |
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|
347 |
oop* section_start = align_down(const_cast<oop*>(ptr), block_alignment); |
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|
348 |
// Start with a guess that the containing section is the last section, |
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|
349 |
// so the block starts section_count-1 sections earlier. |
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|
350 |
oop* section = section_start - (section_size * (section_count - 1)); |
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|
351 |
// Walk up through the potential block start positions, looking for |
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|
352 |
// the owner in the expected location. If we're below the actual block |
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|
353 |
// start position, the value at the owner position will be some oop |
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|
354 |
// (possibly NULL), which can never match the owner. |
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|
355 |
intptr_t owner_addr = reinterpret_cast<intptr_t>(owner); |
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|
356 |
for (unsigned i = 0; i < section_count; ++i, section += section_size) { |
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|
357 |
Block* candidate = reinterpret_cast<Block*>(section); |
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|
358 |
intptr_t* candidate_owner_addr |
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|
359 |
= reinterpret_cast<intptr_t*>(&candidate->_owner); |
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|
360 |
if (SafeFetchN(candidate_owner_addr, 0) == owner_addr) { |
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|
361 |
return candidate; |
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|
362 |
} |
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|
363 |
} |
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|
364 |
return NULL; |
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|
365 |
} |
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|
366 |
|
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|
367 |
////////////////////////////////////////////////////////////////////////////// |
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|
368 |
// Allocation |
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|
369 |
// |
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|
370 |
// Allocation involves the _allocate_list, which contains a subset of the |
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|
371 |
// blocks owned by a storage object. This is a doubly-linked list, linked |
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|
372 |
// through dedicated fields in the blocks. Full blocks are removed from this |
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373 |
// list, though they are still present in the _active_array. Empty blocks are |
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|
374 |
// kept at the end of the _allocate_list, to make it easy for empty block |
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|
375 |
// deletion to find them. |
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|
376 |
// |
48886 | 377 |
// allocate(), and delete_empty_blocks_concurrent() lock the |
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|
378 |
// _allocate_mutex while performing any list and array modifications. |
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|
379 |
// |
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|
380 |
// allocate() and release() update a block's _allocated_bitmask using CAS |
48886 | 381 |
// loops. This prevents loss of updates even though release() performs |
382 |
// its updates without any locking. |
|
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|
383 |
// |
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|
384 |
// allocate() obtains the entry from the first block in the _allocate_list, |
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|
385 |
// and updates that block's _allocated_bitmask to indicate the entry is in |
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|
386 |
// use. If this makes the block full (all entries in use), the block is |
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|
387 |
// removed from the _allocate_list so it won't be considered by future |
48886 | 388 |
// allocations until some entries in it are released. |
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|
389 |
// |
48886 | 390 |
// release() is performed lock-free. release() first looks up the block for |
391 |
// the entry, using address alignment to find the enclosing block (thereby |
|
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|
392 |
// avoiding iteration over the _active_array). Once the block has been |
48886 | 393 |
// determined, its _allocated_bitmask needs to be updated, and its position in |
394 |
// the _allocate_list may need to be updated. There are two cases: |
|
48787
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|
395 |
// |
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|
396 |
// (a) If the block is neither full nor would become empty with the release of |
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|
397 |
// the entry, only its _allocated_bitmask needs to be updated. But if the CAS |
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|
398 |
// update fails, the applicable case may change for the retry. |
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|
399 |
// |
48886 | 400 |
// (b) Otherwise, the _allocate_list also needs to be modified. This requires |
401 |
// locking the _allocate_mutex. To keep the release() operation lock-free, |
|
402 |
// rather than updating the _allocate_list itself, it instead performs a |
|
403 |
// lock-free push of the block onto the _deferred_updates list. Entries on |
|
404 |
// that list are processed by allocate() and delete_empty_blocks_XXX(), while |
|
405 |
// they already hold the necessary lock. That processing makes the block's |
|
406 |
// list state consistent with its current _allocated_bitmask. The block is |
|
407 |
// added to the _allocate_list if not already present and the bitmask is not |
|
408 |
// full. The block is moved to the end of the _allocated_list if the bitmask |
|
409 |
// is empty, for ease of empty block deletion processing. |
|
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|
410 |
|
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|
411 |
oop* OopStorage::allocate() { |
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|
412 |
MutexLockerEx ml(_allocate_mutex, Mutex::_no_safepoint_check_flag); |
48886 | 413 |
// Do some deferred update processing every time we allocate. |
414 |
// Continue processing deferred updates if _allocate_list is empty, |
|
415 |
// in the hope that we'll get a block from that, rather than |
|
416 |
// allocating a new block. |
|
417 |
while (reduce_deferred_updates() && (_allocate_list.head() == NULL)) {} |
|
418 |
||
419 |
// Use the first block in _allocate_list for the allocation. |
|
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|
420 |
Block* block = _allocate_list.head(); |
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|
421 |
if (block == NULL) { |
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|
422 |
// No available blocks; make a new one, and add to storage. |
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|
423 |
{ |
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|
424 |
MutexUnlockerEx mul(_allocate_mutex, Mutex::_no_safepoint_check_flag); |
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|
425 |
block = Block::new_block(this); |
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|
426 |
} |
48886 | 427 |
if (block == NULL) { |
428 |
while (_allocate_list.head() == NULL) { |
|
429 |
if (!reduce_deferred_updates()) { |
|
430 |
// Failed to make new block, no other thread made a block |
|
431 |
// available while the mutex was released, and didn't get |
|
432 |
// one from a deferred update either, so return failure. |
|
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|
433 |
log_info(oopstorage, ref)("%s: failed block allocation", name()); |
48886 | 434 |
return NULL; |
435 |
} |
|
436 |
} |
|
437 |
} else { |
|
48787
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|
438 |
// Add new block to storage. |
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|
439 |
log_info(oopstorage, blocks)("%s: new block " PTR_FORMAT, name(), p2i(block)); |
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|
440 |
|
49977
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8200557: OopStorage parallel iteration scales poorly
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changeset
|
441 |
// Add new block to the _active_array, growing if needed. |
9f758f0bb058
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changeset
|
442 |
if (!_active_array->push(block)) { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
443 |
if (expand_active_array()) { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
444 |
guarantee(_active_array->push(block), "push failed after expansion"); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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diff
changeset
|
445 |
} else { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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diff
changeset
|
446 |
log_info(oopstorage, blocks)("%s: failed active array expand", name()); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
447 |
Block::delete_block(*block); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
448 |
return NULL; |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
449 |
} |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
450 |
} |
48787
7638bf98a312
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kbarrett
parents:
diff
changeset
|
451 |
// Add to end of _allocate_list. The mutex release allowed |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
452 |
// other threads to add blocks to the _allocate_list. We prefer |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
453 |
// to allocate from non-empty blocks, to allow empty blocks to |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
454 |
// be deleted. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
455 |
_allocate_list.push_back(*block); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
456 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
457 |
block = _allocate_list.head(); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
458 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
459 |
// Allocate from first block. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
460 |
assert(block != NULL, "invariant"); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
461 |
assert(!block->is_full(), "invariant"); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
462 |
if (block->is_empty()) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
463 |
// Transitioning from empty to not empty. |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
464 |
log_debug(oopstorage, blocks)("%s: block not empty " PTR_FORMAT, name(), p2i(block)); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
465 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
466 |
oop* result = block->allocate(); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
467 |
assert(result != NULL, "allocation failed"); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
468 |
assert(!block->is_empty(), "postcondition"); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
469 |
Atomic::inc(&_allocation_count); // release updates outside lock. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
470 |
if (block->is_full()) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
471 |
// Transitioning from not full to full. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
472 |
// Remove full blocks from consideration by future allocates. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
473 |
log_debug(oopstorage, blocks)("%s: block full " PTR_FORMAT, name(), p2i(block)); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
474 |
_allocate_list.unlink(*block); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
475 |
} |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
476 |
log_info(oopstorage, ref)("%s: allocated " PTR_FORMAT, name(), p2i(result)); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
477 |
return result; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
478 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
479 |
|
49977
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8200557: OopStorage parallel iteration scales poorly
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diff
changeset
|
480 |
// Create a new, larger, active array with the same content as the |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
481 |
// current array, and then replace, relinquishing the old array. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
482 |
// Return true if the array was successfully expanded, false to |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
483 |
// indicate allocation failure. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
484 |
bool OopStorage::expand_active_array() { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
485 |
assert_lock_strong(_allocate_mutex); |
50209
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diff
changeset
|
486 |
ActiveArray* old_array = _active_array; |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
487 |
size_t new_size = 2 * old_array->size(); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
488 |
log_info(oopstorage, blocks)("%s: expand active array " SIZE_FORMAT, |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
489 |
name(), new_size); |
50209
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parents:
49977
diff
changeset
|
490 |
ActiveArray* new_array = ActiveArray::create(new_size, AllocFailStrategy::RETURN_NULL); |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
491 |
if (new_array == NULL) return false; |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
492 |
new_array->copy_from(old_array); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
493 |
replace_active_array(new_array); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
494 |
relinquish_block_array(old_array); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
495 |
return true; |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
496 |
} |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
497 |
|
50332
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8204179: [BACKOUT] OopStorage should use GlobalCounter
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50300
diff
changeset
|
498 |
OopStorage::ProtectActive::ProtectActive() : _enter(0), _exit() {} |
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diff
changeset
|
499 |
|
d0d933d61610
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diff
changeset
|
500 |
// Begin read-side critical section. |
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diff
changeset
|
501 |
uint OopStorage::ProtectActive::read_enter() { |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
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diff
changeset
|
502 |
return Atomic::add(2u, &_enter); |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
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parents:
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diff
changeset
|
503 |
} |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
504 |
|
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
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parents:
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diff
changeset
|
505 |
// End read-side critical section. |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
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diff
changeset
|
506 |
void OopStorage::ProtectActive::read_exit(uint enter_value) { |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
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50300
diff
changeset
|
507 |
Atomic::add(2u, &_exit[enter_value & 1]); |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
508 |
} |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
509 |
|
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
510 |
// Wait until all readers that entered the critical section before |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
511 |
// synchronization have exited that critical section. |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
512 |
void OopStorage::ProtectActive::write_synchronize() { |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
513 |
SpinYield spinner; |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
514 |
// Determine old and new exit counters, based on bit0 of the |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
515 |
// on-entry _enter counter. |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
516 |
uint value = OrderAccess::load_acquire(&_enter); |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
517 |
volatile uint* new_ptr = &_exit[(value + 1) & 1]; |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
518 |
// Atomically change the in-use exit counter to the new counter, by |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
519 |
// adding 1 to the _enter counter (flipping bit0 between 0 and 1) |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
520 |
// and initializing the new exit counter to that enter value. Note: |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
521 |
// The new exit counter is not being used by read operations until |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
522 |
// this change succeeds. |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
523 |
uint old; |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
524 |
do { |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
525 |
old = value; |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
526 |
*new_ptr = ++value; |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
527 |
value = Atomic::cmpxchg(value, &_enter, old); |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
528 |
} while (old != value); |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
529 |
// Readers that entered the critical section before we changed the |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
530 |
// selected exit counter will use the old exit counter. Readers |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
531 |
// entering after the change will use the new exit counter. Wait |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
532 |
// for all the critical sections started before the change to |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
533 |
// complete, e.g. for the value of old_ptr to catch up with old. |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
534 |
volatile uint* old_ptr = &_exit[old & 1]; |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
535 |
while (old != OrderAccess::load_acquire(old_ptr)) { |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
536 |
spinner.wait(); |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
537 |
} |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
538 |
} |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
539 |
|
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
540 |
// Make new_array the _active_array. Increments new_array's refcount |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
541 |
// to account for the new reference. The assignment is atomic wrto |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
542 |
// obtain_active_array; once this function returns, it is safe for the |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
543 |
// caller to relinquish the old array. |
50209
2fdce199fcb9
8202863: Rename OopStorage inner collection classes
kbarrett
parents:
49977
diff
changeset
|
544 |
void OopStorage::replace_active_array(ActiveArray* new_array) { |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
545 |
// Caller has the old array that is the current value of _active_array. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
546 |
// Update new_array refcount to account for the new reference. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
547 |
new_array->increment_refcount(); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
548 |
// Install new_array, ensuring its initialization is complete first. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
549 |
OrderAccess::release_store(&_active_array, new_array); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
550 |
// Wait for any readers that could read the old array from _active_array. |
50332
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
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parents:
50300
diff
changeset
|
551 |
_protect_active.write_synchronize(); |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
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parents:
50300
diff
changeset
|
552 |
// All obtain critical sections that could see the old array have |
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
kbarrett
parents:
50300
diff
changeset
|
553 |
// completed, having incremented the refcount of the old array. The |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
554 |
// caller can now safely relinquish the old array. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
555 |
} |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
556 |
|
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
557 |
// Atomically (wrto replace_active_array) get the active array and |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
558 |
// increment its refcount. This provides safe access to the array, |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
559 |
// even if an allocate operation expands and replaces the value of |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
560 |
// _active_array. The caller must relinquish the array when done |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
561 |
// using it. |
50209
2fdce199fcb9
8202863: Rename OopStorage inner collection classes
kbarrett
parents:
49977
diff
changeset
|
562 |
OopStorage::ActiveArray* OopStorage::obtain_active_array() const { |
50332
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
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parents:
50300
diff
changeset
|
563 |
uint enter_value = _protect_active.read_enter(); |
50209
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8202863: Rename OopStorage inner collection classes
kbarrett
parents:
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diff
changeset
|
564 |
ActiveArray* result = OrderAccess::load_acquire(&_active_array); |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
565 |
result->increment_refcount(); |
50332
d0d933d61610
8204179: [BACKOUT] OopStorage should use GlobalCounter
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parents:
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diff
changeset
|
566 |
_protect_active.read_exit(enter_value); |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
567 |
return result; |
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|
568 |
} |
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changeset
|
569 |
|
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|
570 |
// Decrement refcount of array and destroy if refcount is zero. |
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|
571 |
void OopStorage::relinquish_block_array(ActiveArray* array) const { |
49977
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|
572 |
if (array->decrement_refcount()) { |
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|
573 |
assert(array != _active_array, "invariant"); |
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|
574 |
ActiveArray::destroy(array); |
49977
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|
575 |
} |
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changeset
|
576 |
} |
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changeset
|
577 |
|
9f758f0bb058
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|
578 |
class OopStorage::WithActiveArray : public StackObj { |
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|
579 |
const OopStorage* _storage; |
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|
580 |
ActiveArray* _active_array; |
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changeset
|
581 |
|
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changeset
|
582 |
public: |
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|
583 |
WithActiveArray(const OopStorage* storage) : |
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|
584 |
_storage(storage), |
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diff
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|
585 |
_active_array(storage->obtain_active_array()) |
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|
586 |
{} |
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changeset
|
587 |
|
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changeset
|
588 |
~WithActiveArray() { |
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changeset
|
589 |
_storage->relinquish_block_array(_active_array); |
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changeset
|
590 |
} |
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changeset
|
591 |
|
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changeset
|
592 |
ActiveArray& active_array() const { |
49977
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|
593 |
return *_active_array; |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
594 |
} |
9f758f0bb058
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parents:
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diff
changeset
|
595 |
}; |
9f758f0bb058
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changeset
|
596 |
|
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|
597 |
OopStorage::Block* OopStorage::find_block_or_null(const oop* ptr) const { |
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|
598 |
assert(ptr != NULL, "precondition"); |
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diff
changeset
|
599 |
return Block::block_for_ptr(this, ptr); |
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diff
changeset
|
600 |
} |
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changeset
|
601 |
|
48886 | 602 |
static void log_release_transitions(uintx releasing, |
603 |
uintx old_allocated, |
|
604 |
const OopStorage* owner, |
|
605 |
const void* block) { |
|
606 |
Log(oopstorage, blocks) log; |
|
607 |
LogStream ls(log.debug()); |
|
608 |
if (is_full_bitmask(old_allocated)) { |
|
609 |
ls.print_cr("%s: block not full " PTR_FORMAT, owner->name(), p2i(block)); |
|
610 |
} |
|
611 |
if (releasing == old_allocated) { |
|
612 |
ls.print_cr("%s: block empty " PTR_FORMAT, owner->name(), p2i(block)); |
|
48787
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|
613 |
} |
7638bf98a312
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parents:
diff
changeset
|
614 |
} |
7638bf98a312
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diff
changeset
|
615 |
|
48886 | 616 |
void OopStorage::Block::release_entries(uintx releasing, Block* volatile* deferred_list) { |
617 |
assert(releasing != 0, "preconditon"); |
|
618 |
// Prevent empty block deletion when transitioning to empty. |
|
619 |
Atomic::inc(&_release_refcount); |
|
620 |
||
621 |
// Atomically update allocated bitmask. |
|
622 |
uintx old_allocated = _allocated_bitmask; |
|
623 |
while (true) { |
|
624 |
assert((releasing & ~old_allocated) == 0, "releasing unallocated entries"); |
|
625 |
uintx new_value = old_allocated ^ releasing; |
|
626 |
uintx fetched = Atomic::cmpxchg(new_value, &_allocated_bitmask, old_allocated); |
|
627 |
if (fetched == old_allocated) break; // Successful update. |
|
628 |
old_allocated = fetched; // Retry with updated bitmask. |
|
629 |
} |
|
48787
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diff
changeset
|
630 |
|
48886 | 631 |
// Now that the bitmask has been updated, if we have a state transition |
632 |
// (updated bitmask is empty or old bitmask was full), atomically push |
|
633 |
// this block onto the deferred updates list. Some future call to |
|
634 |
// reduce_deferred_updates will make any needed changes related to this |
|
635 |
// block and _allocate_list. This deferral avoids list updates and the |
|
636 |
// associated locking here. |
|
637 |
if ((releasing == old_allocated) || is_full_bitmask(old_allocated)) { |
|
638 |
// Log transitions. Both transitions are possible in a single update. |
|
639 |
if (log_is_enabled(Debug, oopstorage, blocks)) { |
|
640 |
log_release_transitions(releasing, old_allocated, _owner, this); |
|
641 |
} |
|
642 |
// Attempt to claim responsibility for adding this block to the deferred |
|
643 |
// list, by setting the link to non-NULL by self-looping. If this fails, |
|
644 |
// then someone else has made such a claim and the deferred update has not |
|
645 |
// yet been processed and will include our change, so we don't need to do |
|
646 |
// anything further. |
|
647 |
if (Atomic::replace_if_null(this, &_deferred_updates_next)) { |
|
648 |
// Successfully claimed. Push, with self-loop for end-of-list. |
|
649 |
Block* head = *deferred_list; |
|
650 |
while (true) { |
|
651 |
_deferred_updates_next = (head == NULL) ? this : head; |
|
652 |
Block* fetched = Atomic::cmpxchg(this, deferred_list, head); |
|
653 |
if (fetched == head) break; // Successful update. |
|
654 |
head = fetched; // Retry with updated head. |
|
655 |
} |
|
656 |
log_debug(oopstorage, blocks)("%s: deferred update " PTR_FORMAT, |
|
657 |
_owner->name(), p2i(this)); |
|
658 |
} |
|
659 |
} |
|
660 |
// Release hold on empty block deletion. |
|
661 |
Atomic::dec(&_release_refcount); |
|
662 |
} |
|
48787
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diff
changeset
|
663 |
|
48886 | 664 |
// Process one available deferred update. Returns true if one was processed. |
665 |
bool OopStorage::reduce_deferred_updates() { |
|
666 |
assert_locked_or_safepoint(_allocate_mutex); |
|
667 |
// Atomically pop a block off the list, if any available. |
|
668 |
// No ABA issue because this is only called by one thread at a time. |
|
669 |
// The atomicity is wrto pushes by release(). |
|
670 |
Block* block = OrderAccess::load_acquire(&_deferred_updates); |
|
671 |
while (true) { |
|
672 |
if (block == NULL) return false; |
|
673 |
// Try atomic pop of block from list. |
|
674 |
Block* tail = block->deferred_updates_next(); |
|
675 |
if (block == tail) tail = NULL; // Handle self-loop end marker. |
|
676 |
Block* fetched = Atomic::cmpxchg(tail, &_deferred_updates, block); |
|
677 |
if (fetched == block) break; // Update successful. |
|
678 |
block = fetched; // Retry with updated block. |
|
679 |
} |
|
680 |
block->set_deferred_updates_next(NULL); // Clear tail after updating head. |
|
681 |
// Ensure bitmask read after pop is complete, including clearing tail, for |
|
682 |
// ordering with release(). Without this, we may be processing a stale |
|
683 |
// bitmask state here while blocking a release() operation from recording |
|
684 |
// the deferred update needed for its bitmask change. |
|
685 |
OrderAccess::storeload(); |
|
686 |
// Process popped block. |
|
687 |
uintx allocated = block->allocated_bitmask(); |
|
48787
7638bf98a312
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diff
changeset
|
688 |
|
48886 | 689 |
// Make membership in list consistent with bitmask state. |
690 |
if ((_allocate_list.ctail() != NULL) && |
|
691 |
((_allocate_list.ctail() == block) || |
|
692 |
(_allocate_list.next(*block) != NULL))) { |
|
693 |
// Block is in the allocate list. |
|
694 |
assert(!is_full_bitmask(allocated), "invariant"); |
|
695 |
} else if (!is_full_bitmask(allocated)) { |
|
696 |
// Block is not in the allocate list, but now should be. |
|
697 |
_allocate_list.push_front(*block); |
|
698 |
} // Else block is full and not in list, which is correct. |
|
699 |
||
700 |
// Move empty block to end of list, for possible deletion. |
|
701 |
if (is_empty_bitmask(allocated)) { |
|
702 |
_allocate_list.unlink(*block); |
|
703 |
_allocate_list.push_back(*block); |
|
48787
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parents:
diff
changeset
|
704 |
} |
48886 | 705 |
|
706 |
log_debug(oopstorage, blocks)("%s: processed deferred update " PTR_FORMAT, |
|
707 |
name(), p2i(block)); |
|
708 |
return true; // Processed one pending update. |
|
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
709 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
710 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
711 |
inline void check_release_entry(const oop* entry) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
712 |
assert(entry != NULL, "Releasing NULL"); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
713 |
assert(*entry == NULL, "Releasing uncleared entry: " PTR_FORMAT, p2i(entry)); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
714 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
715 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
716 |
void OopStorage::release(const oop* ptr) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
717 |
check_release_entry(ptr); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
718 |
Block* block = find_block_or_null(ptr); |
48886 | 719 |
assert(block != NULL, "%s: invalid release " PTR_FORMAT, name(), p2i(ptr)); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
720 |
log_info(oopstorage, ref)("%s: released " PTR_FORMAT, name(), p2i(ptr)); |
48886 | 721 |
block->release_entries(block->bitmask_for_entry(ptr), &_deferred_updates); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
722 |
Atomic::dec(&_allocation_count); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
723 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
724 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
725 |
void OopStorage::release(const oop* const* ptrs, size_t size) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
726 |
size_t i = 0; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
727 |
while (i < size) { |
48808
2b0b7f222800
8195690: JNI GetObjectRefType doesn't handle NULL
kbarrett
parents:
48787
diff
changeset
|
728 |
check_release_entry(ptrs[i]); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
729 |
Block* block = find_block_or_null(ptrs[i]); |
48886 | 730 |
assert(block != NULL, "%s: invalid release " PTR_FORMAT, name(), p2i(ptrs[i])); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
731 |
log_info(oopstorage, ref)("%s: released " PTR_FORMAT, name(), p2i(ptrs[i])); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
732 |
size_t count = 0; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
733 |
uintx releasing = 0; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
734 |
for ( ; i < size; ++i) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
735 |
const oop* entry = ptrs[i]; |
48886 | 736 |
check_release_entry(entry); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
737 |
// If entry not in block, finish block and resume outer loop with entry. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
738 |
if (!block->contains(entry)) break; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
739 |
// Add entry to releasing bitmap. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
740 |
log_info(oopstorage, ref)("%s: released " PTR_FORMAT, name(), p2i(entry)); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
741 |
uintx entry_bitmask = block->bitmask_for_entry(entry); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
742 |
assert((releasing & entry_bitmask) == 0, |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
743 |
"Duplicate entry: " PTR_FORMAT, p2i(entry)); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
744 |
releasing |= entry_bitmask; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
745 |
++count; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
746 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
747 |
// Release the contiguous entries that are in block. |
48886 | 748 |
block->release_entries(releasing, &_deferred_updates); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
749 |
Atomic::sub(count, &_allocation_count); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
750 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
751 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
752 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
753 |
const char* dup_name(const char* name) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
754 |
char* dup = NEW_C_HEAP_ARRAY(char, strlen(name) + 1, mtGC); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
755 |
strcpy(dup, name); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
756 |
return dup; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
757 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
758 |
|
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
759 |
const size_t initial_active_array_size = 8; |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
760 |
|
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
761 |
OopStorage::OopStorage(const char* name, |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
762 |
Mutex* allocate_mutex, |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
763 |
Mutex* active_mutex) : |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
764 |
_name(dup_name(name)), |
50209
2fdce199fcb9
8202863: Rename OopStorage inner collection classes
kbarrett
parents:
49977
diff
changeset
|
765 |
_active_array(ActiveArray::create(initial_active_array_size)), |
50513
7f166e010af4
8204097: Simplify OopStorage::AllocateList block entry access
kbarrett
parents:
50429
diff
changeset
|
766 |
_allocate_list(), |
48886 | 767 |
_deferred_updates(NULL), |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
768 |
_allocate_mutex(allocate_mutex), |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
769 |
_active_mutex(active_mutex), |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
770 |
_allocation_count(0), |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
771 |
_concurrent_iteration_active(false) |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
772 |
{ |
49977
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diff
changeset
|
773 |
_active_array->increment_refcount(); |
48787
7638bf98a312
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diff
changeset
|
774 |
assert(_active_mutex->rank() < _allocate_mutex->rank(), |
7638bf98a312
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parents:
diff
changeset
|
775 |
"%s: active_mutex must have lower rank than allocate_mutex", _name); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
776 |
assert(_active_mutex->_safepoint_check_required != Mutex::_safepoint_check_always, |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
777 |
"%s: active mutex requires safepoint check", _name); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
778 |
assert(_allocate_mutex->_safepoint_check_required != Mutex::_safepoint_check_always, |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
779 |
"%s: allocate mutex requires safepoint check", _name); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
780 |
} |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
781 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
782 |
void OopStorage::delete_empty_block(const Block& block) { |
7638bf98a312
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parents:
diff
changeset
|
783 |
assert(block.is_empty(), "discarding non-empty block"); |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
784 |
log_info(oopstorage, blocks)("%s: delete empty block " PTR_FORMAT, name(), p2i(&block)); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
785 |
Block::delete_block(block); |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
786 |
} |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
787 |
|
7638bf98a312
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kbarrett
parents:
diff
changeset
|
788 |
OopStorage::~OopStorage() { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
789 |
Block* block; |
48886 | 790 |
while ((block = _deferred_updates) != NULL) { |
791 |
_deferred_updates = block->deferred_updates_next(); |
|
792 |
block->set_deferred_updates_next(NULL); |
|
793 |
} |
|
48787
7638bf98a312
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parents:
diff
changeset
|
794 |
while ((block = _allocate_list.head()) != NULL) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
795 |
_allocate_list.unlink(*block); |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
796 |
} |
49977
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changeset
|
797 |
bool unreferenced = _active_array->decrement_refcount(); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
798 |
assert(unreferenced, "deleting storage while _active_array is referenced"); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
799 |
for (size_t i = _active_array->block_count(); 0 < i; ) { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
800 |
block = _active_array->at(--i); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
801 |
Block::delete_block(*block); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
802 |
} |
50209
2fdce199fcb9
8202863: Rename OopStorage inner collection classes
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diff
changeset
|
803 |
ActiveArray::destroy(_active_array); |
48787
7638bf98a312
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kbarrett
parents:
diff
changeset
|
804 |
FREE_C_HEAP_ARRAY(char, _name); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
805 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
806 |
|
48886 | 807 |
void OopStorage::delete_empty_blocks_safepoint() { |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
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parents:
diff
changeset
|
808 |
assert_at_safepoint(); |
48886 | 809 |
// Process any pending release updates, which may make more empty |
810 |
// blocks available for deletion. |
|
811 |
while (reduce_deferred_updates()) {} |
|
48787
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8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
812 |
// Don't interfere with a concurrent iteration. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
813 |
if (_concurrent_iteration_active) return; |
48886 | 814 |
// Delete empty (and otherwise deletable) blocks from end of _allocate_list. |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
815 |
for (Block* block = _allocate_list.tail(); |
48886 | 816 |
(block != NULL) && block->is_deletable(); |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
817 |
block = _allocate_list.tail()) { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
818 |
_active_array->remove(block); |
48886 | 819 |
_allocate_list.unlink(*block); |
820 |
delete_empty_block(*block); |
|
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
821 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
822 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
823 |
|
48886 | 824 |
void OopStorage::delete_empty_blocks_concurrent() { |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
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parents:
diff
changeset
|
825 |
MutexLockerEx ml(_allocate_mutex, Mutex::_no_safepoint_check_flag); |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
826 |
// Other threads could be adding to the empty block count while we |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
827 |
// release the mutex across the block deletions. Set an upper bound |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
828 |
// on how many blocks we'll try to release, so other threads can't |
7638bf98a312
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kbarrett
parents:
diff
changeset
|
829 |
// cause an unbounded stay in this function. |
49977
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8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
830 |
size_t limit = block_count(); |
48886 | 831 |
|
832 |
for (size_t i = 0; i < limit; ++i) { |
|
833 |
// Additional updates might become available while we dropped the |
|
834 |
// lock. But limit number processed to limit lock duration. |
|
835 |
reduce_deferred_updates(); |
|
836 |
||
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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parents:
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diff
changeset
|
837 |
Block* block = _allocate_list.tail(); |
48886 | 838 |
if ((block == NULL) || !block->is_deletable()) { |
839 |
// No block to delete, so done. There could be more pending |
|
840 |
// deferred updates that could give us more work to do; deal with |
|
841 |
// that in some later call, to limit lock duration here. |
|
842 |
return; |
|
843 |
} |
|
844 |
||
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
845 |
{ |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
846 |
MutexLockerEx aml(_active_mutex, Mutex::_no_safepoint_check_flag); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
847 |
// Don't interfere with a concurrent iteration. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
848 |
if (_concurrent_iteration_active) return; |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
849 |
_active_array->remove(block); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
850 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
851 |
// Remove block from _allocate_list and delete it. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
852 |
_allocate_list.unlink(*block); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
853 |
// Release mutex while deleting block. |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
854 |
MutexUnlockerEx ul(_allocate_mutex, Mutex::_no_safepoint_check_flag); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
855 |
delete_empty_block(*block); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
856 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
857 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
858 |
|
48886 | 859 |
OopStorage::EntryStatus OopStorage::allocation_status(const oop* ptr) const { |
860 |
const Block* block = find_block_or_null(ptr); |
|
861 |
if (block != NULL) { |
|
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
862 |
// Prevent block deletion and _active_array modification. |
48886 | 863 |
MutexLockerEx ml(_allocate_mutex, Mutex::_no_safepoint_check_flag); |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
864 |
// Block could be a false positive, so get index carefully. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
865 |
size_t index = Block::active_index_safe(block); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
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diff
changeset
|
866 |
if ((index < _active_array->block_count()) && |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
867 |
(block == _active_array->at(index)) && |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
868 |
block->contains(ptr)) { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
869 |
if ((block->allocated_bitmask() & block->bitmask_for_entry(ptr)) != 0) { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
870 |
return ALLOCATED_ENTRY; |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
871 |
} else { |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
872 |
return UNALLOCATED_ENTRY; |
48886 | 873 |
} |
874 |
} |
|
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
875 |
} |
48886 | 876 |
return INVALID_ENTRY; |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
877 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
878 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
879 |
size_t OopStorage::allocation_count() const { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
880 |
return _allocation_count; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
881 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
882 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
883 |
size_t OopStorage::block_count() const { |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
884 |
WithActiveArray wab(this); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
885 |
// Count access is racy, but don't care. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
886 |
return wab.active_array().block_count(); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
887 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
888 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
889 |
size_t OopStorage::total_memory_usage() const { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
890 |
size_t total_size = sizeof(OopStorage); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
891 |
total_size += strlen(name()) + 1; |
50209
2fdce199fcb9
8202863: Rename OopStorage inner collection classes
kbarrett
parents:
49977
diff
changeset
|
892 |
total_size += sizeof(ActiveArray); |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
893 |
WithActiveArray wab(this); |
50209
2fdce199fcb9
8202863: Rename OopStorage inner collection classes
kbarrett
parents:
49977
diff
changeset
|
894 |
const ActiveArray& blocks = wab.active_array(); |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
895 |
// Count access is racy, but don't care. |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
896 |
total_size += blocks.block_count() * Block::allocation_size(); |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
897 |
total_size += blocks.size() * sizeof(Block*); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
898 |
return total_size; |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
899 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
900 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
901 |
// Parallel iteration support |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
902 |
|
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
903 |
uint OopStorage::BasicParState::default_estimated_thread_count(bool concurrent) { |
50298
188a87cbfac3
8203843: BasicParState::default_estimated_thread_count(false) can return 0 in gtest
kbarrett
parents:
50209
diff
changeset
|
904 |
uint configured = concurrent ? ConcGCThreads : ParallelGCThreads; |
188a87cbfac3
8203843: BasicParState::default_estimated_thread_count(false) can return 0 in gtest
kbarrett
parents:
50209
diff
changeset
|
905 |
return MAX2(1u, configured); // Never estimate zero threads. |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
906 |
} |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
907 |
|
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
908 |
OopStorage::BasicParState::BasicParState(const OopStorage* storage, |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
909 |
uint estimated_thread_count, |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
910 |
bool concurrent) : |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
911 |
_storage(storage), |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
912 |
_active_array(_storage->obtain_active_array()), |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
913 |
_block_count(0), // initialized properly below |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
914 |
_next_block(0), |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
915 |
_estimated_thread_count(estimated_thread_count), |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
916 |
_concurrent(concurrent) |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
917 |
{ |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
918 |
assert(estimated_thread_count > 0, "estimated thread count must be positive"); |
48787
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
919 |
update_iteration_state(true); |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
920 |
// Get the block count *after* iteration state updated, so concurrent |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
921 |
// empty block deletion is suppressed and can't reduce the count. But |
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
922 |
// ensure the count we use was written after the block with that count |
50209
2fdce199fcb9
8202863: Rename OopStorage inner collection classes
kbarrett
parents:
49977
diff
changeset
|
923 |
// was fully initialized; see ActiveArray::push. |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
kbarrett
parents:
49711
diff
changeset
|
924 |
_block_count = _active_array->block_count_acquire(); |
48787
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|
925 |
} |
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|
926 |
|
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|
927 |
OopStorage::BasicParState::~BasicParState() { |
49977
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|
928 |
_storage->relinquish_block_array(_active_array); |
48787
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|
929 |
update_iteration_state(false); |
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|
930 |
} |
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|
931 |
|
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|
932 |
void OopStorage::BasicParState::update_iteration_state(bool value) { |
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|
933 |
if (_concurrent) { |
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|
934 |
MutexLockerEx ml(_storage->_active_mutex, Mutex::_no_safepoint_check_flag); |
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|
935 |
assert(_storage->_concurrent_iteration_active != value, "precondition"); |
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|
936 |
_storage->_concurrent_iteration_active = value; |
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|
937 |
} |
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|
938 |
} |
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|
939 |
|
49977
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|
940 |
bool OopStorage::BasicParState::claim_next_segment(IterationData* data) { |
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|
941 |
data->_processed += data->_segment_end - data->_segment_start; |
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|
942 |
size_t start = OrderAccess::load_acquire(&_next_block); |
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|
943 |
if (start >= _block_count) { |
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|
944 |
return finish_iteration(data); // No more blocks available. |
49333
489f1dd40582
8196876: OopStorage::assert_at_safepoint clashes with assert_at_safepoint macros in g1CollectedHeap.hpp
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|
945 |
} |
49977
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|
946 |
// Try to claim several at a time, but not *too* many. We want to |
9f758f0bb058
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|
947 |
// avoid deciding there are many available and selecting a large |
9f758f0bb058
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diff
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|
948 |
// quantity, get delayed, and then end up claiming most or all of |
9f758f0bb058
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diff
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|
949 |
// the remaining largish amount of work, leaving nothing for other |
9f758f0bb058
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|
950 |
// threads to do. But too small a step can lead to contention |
9f758f0bb058
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|
951 |
// over _next_block, esp. when the work per block is small. |
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|
952 |
size_t max_step = 10; |
9f758f0bb058
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diff
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|
953 |
size_t remaining = _block_count - start; |
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|
954 |
size_t step = MIN2(max_step, 1 + (remaining / _estimated_thread_count)); |
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|
955 |
// Atomic::add with possible overshoot. This can perform better |
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|
956 |
// than a CAS loop on some platforms when there is contention. |
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|
957 |
// We can cope with the uncertainty by recomputing start/end from |
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|
958 |
// the result of the add, and dealing with potential overshoot. |
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|
959 |
size_t end = Atomic::add(step, &_next_block); |
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|
960 |
// _next_block may have changed, so recompute start from result of add. |
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|
961 |
start = end - step; |
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|
962 |
// _next_block may have changed so much that end has overshot. |
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|
963 |
end = MIN2(end, _block_count); |
9f758f0bb058
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|
964 |
// _next_block may have changed so much that even start has overshot. |
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|
965 |
if (start < _block_count) { |
9f758f0bb058
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diff
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|
966 |
// Record claimed segment for iteration. |
9f758f0bb058
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|
967 |
data->_segment_start = start; |
9f758f0bb058
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|
968 |
data->_segment_end = end; |
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|
969 |
return true; // Success. |
9f758f0bb058
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diff
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|
970 |
} else { |
9f758f0bb058
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diff
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|
971 |
// No more blocks to claim. |
9f758f0bb058
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|
972 |
return finish_iteration(data); |
48787
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|
973 |
} |
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|
974 |
} |
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changeset
|
975 |
|
49977
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|
976 |
bool OopStorage::BasicParState::finish_iteration(const IterationData* data) const { |
9f758f0bb058
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|
977 |
log_debug(oopstorage, blocks, stats) |
9f758f0bb058
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changeset
|
978 |
("Parallel iteration on %s: blocks = " SIZE_FORMAT |
9f758f0bb058
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|
979 |
", processed = " SIZE_FORMAT " (%2.f%%)", |
9f758f0bb058
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diff
changeset
|
980 |
_storage->name(), _block_count, data->_processed, |
9f758f0bb058
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diff
changeset
|
981 |
percent_of(data->_processed, _block_count)); |
9f758f0bb058
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parents:
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diff
changeset
|
982 |
return false; |
48787
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diff
changeset
|
983 |
} |
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diff
changeset
|
984 |
|
7638bf98a312
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diff
changeset
|
985 |
const char* OopStorage::name() const { return _name; } |
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diff
changeset
|
986 |
|
7638bf98a312
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kbarrett
parents:
diff
changeset
|
987 |
#ifndef PRODUCT |
7638bf98a312
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kbarrett
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diff
changeset
|
988 |
|
7638bf98a312
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diff
changeset
|
989 |
void OopStorage::print_on(outputStream* st) const { |
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diff
changeset
|
990 |
size_t allocations = _allocation_count; |
49977
9f758f0bb058
8200557: OopStorage parallel iteration scales poorly
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49711
diff
changeset
|
991 |
size_t blocks = _active_array->block_count(); |
48787
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diff
changeset
|
992 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
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diff
changeset
|
993 |
double data_size = section_size * section_count; |
48886 | 994 |
double alloc_percentage = percent_of((double)allocations, blocks * data_size); |
48787
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diff
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|
995 |
|
48886 | 996 |
st->print("%s: " SIZE_FORMAT " entries in " SIZE_FORMAT " blocks (%.F%%), " SIZE_FORMAT " bytes", |
997 |
name(), allocations, blocks, alloc_percentage, total_memory_usage()); |
|
48787
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parents:
diff
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|
998 |
if (_concurrent_iteration_active) { |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
999 |
st->print(", concurrent iteration active"); |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
1000 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
1001 |
} |
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
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parents:
diff
changeset
|
1002 |
|
7638bf98a312
8194312: Support parallel and concurrent JNI global handle processing
kbarrett
parents:
diff
changeset
|
1003 |
#endif // !PRODUCT |