author | pliden |
Mon, 18 Mar 2019 11:50:40 +0100 | |
changeset 54167 | d0d26fc836dd |
parent 50525 | 767cdb97f103 |
child 58125 | 9b4717ca9bd1 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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#include "precompiled.hpp" |
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#include "gc/z/zCPU.hpp" |
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#include "logging/log.hpp" |
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#include "memory/padded.inline.hpp" |
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#include "runtime/os.hpp" |
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#include "runtime/thread.inline.hpp" |
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#include "utilities/debug.hpp" |
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#define ZCPU_UNKNOWN_AFFINITY (Thread*)-1; |
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#define ZCPU_UNKNOWN_SELF (Thread*)-2; |
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PaddedEnd<ZCPU::ZCPUAffinity>* ZCPU::_affinity = NULL; |
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__thread Thread* ZCPU::_self = ZCPU_UNKNOWN_SELF; |
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__thread uint32_t ZCPU::_cpu = 0; |
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void ZCPU::initialize() { |
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assert(_affinity == NULL, "Already initialized"); |
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const uint32_t ncpus = count(); |
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_affinity = PaddedArray<ZCPUAffinity, mtGC>::create_unfreeable(ncpus); |
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for (uint32_t i = 0; i < ncpus; i++) { |
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_affinity[i]._thread = ZCPU_UNKNOWN_AFFINITY; |
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} |
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log_info(gc, init)("CPUs: %u total, %u available", |
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os::processor_count(), |
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os::initial_active_processor_count()); |
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} |
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uint32_t ZCPU::count() { |
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return os::processor_count(); |
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} |
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uint32_t ZCPU::id() { |
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assert(_affinity != NULL, "Not initialized"); |
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// Fast path |
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if (_affinity[_cpu]._thread == _self) { |
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return _cpu; |
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} |
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// Slow path |
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_self = Thread::current(); |
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_cpu = os::processor_id(); |
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// Update affinity table |
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_affinity[_cpu]._thread = _self; |
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return _cpu; |
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} |