| /* |
| * Copyright (c) 2017, 2019, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/z/zNMethodTableEntry.hpp" |
| #include "gc/z/zNMethodTableIteration.hpp" |
| #include "memory/iterator.hpp" |
| #include "runtime/atomic.hpp" |
| #include "utilities/debug.hpp" |
| #include "utilities/globalDefinitions.hpp" |
| |
| ZNMethodTableIteration::ZNMethodTableIteration() : |
| _table(NULL), |
| _size(0), |
| _claimed(0) {} |
| |
| bool ZNMethodTableIteration::in_progress() const { |
| return _table != NULL; |
| } |
| |
| void ZNMethodTableIteration::nmethods_do_begin(ZNMethodTableEntry* table, size_t size) { |
| assert(!in_progress(), "precondition"); |
| |
| _table = table; |
| _size = size; |
| _claimed = 0; |
| } |
| |
| void ZNMethodTableIteration::nmethods_do_end() { |
| assert(_claimed >= _size, "Failed to claim all table entries"); |
| |
| // Finish iteration |
| _table = NULL; |
| } |
| |
| void ZNMethodTableIteration::nmethods_do(NMethodClosure* cl) { |
| for (;;) { |
| // Claim table partition. Each partition is currently sized to span |
| // two cache lines. This number is just a guess, but seems to work well. |
| const size_t partition_size = (ZCacheLineSize * 2) / sizeof(ZNMethodTableEntry); |
| const size_t partition_start = MIN2(Atomic::add(partition_size, &_claimed) - partition_size, _size); |
| const size_t partition_end = MIN2(partition_start + partition_size, _size); |
| if (partition_start == partition_end) { |
| // End of table |
| break; |
| } |
| |
| // Process table partition |
| for (size_t i = partition_start; i < partition_end; i++) { |
| const ZNMethodTableEntry entry = _table[i]; |
| if (entry.registered()) { |
| cl->do_nmethod(entry.method()); |
| } |
| } |
| } |
| } |