70 lines
3.1 KiB
C++
70 lines
3.1 KiB
C++
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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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#include "precompiled.hpp"
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#include "memory/allocation.hpp"
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#include "runtime/synchronizer.hpp"
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#include "runtime/vm_version.hpp"
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#include "unittest.hpp"
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class SynchronizerTest : public ::testing::Test {
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public:
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static u_char* get_gvars_addr() { return ObjectSynchronizer::get_gvars_addr(); }
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static u_char* get_gvars_hcSequence_addr() { return ObjectSynchronizer::get_gvars_hcSequence_addr(); }
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static size_t get_gvars_size() { return ObjectSynchronizer::get_gvars_size(); }
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static u_char* get_gvars_stwRandom_addr() { return ObjectSynchronizer::get_gvars_stwRandom_addr(); }
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};
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TEST_VM(SynchronizerTest, sanity) {
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uint cache_line_size = VM_Version::L1_data_cache_line_size();
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if (cache_line_size != 0) {
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// We were able to determine the L1 data cache line size so
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// do some cache line specific sanity checks
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u_char *addr_begin = SynchronizerTest::get_gvars_addr();
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u_char *addr_stwRandom = SynchronizerTest::get_gvars_stwRandom_addr();
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u_char *addr_hcSequence = SynchronizerTest::get_gvars_hcSequence_addr();
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size_t gvars_size = SynchronizerTest::get_gvars_size();
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uint offset_stwRandom = (uint) (addr_stwRandom - addr_begin);
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uint offset_hcSequence = (uint) (addr_hcSequence - addr_begin);
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uint offset_hcSequence_stwRandom = offset_hcSequence - offset_stwRandom;
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uint offset_hcSequence_struct_end = (uint) gvars_size - offset_hcSequence;
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EXPECT_GE(offset_stwRandom, cache_line_size)
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<< "the SharedGlobals.stwRandom field is closer "
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<< "to the struct beginning than a cache line which permits "
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<< "false sharing.";
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EXPECT_GE(offset_hcSequence_stwRandom, cache_line_size)
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<< "the SharedGlobals.stwRandom and "
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<< "SharedGlobals.hcSequence fields are closer than a cache "
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<< "line which permits false sharing.";
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EXPECT_GE(offset_hcSequence_struct_end, cache_line_size)
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<< "the SharedGlobals.hcSequence field is closer "
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<< "to the struct end than a cache line which permits false "
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<< "sharing.";
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}
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}
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