1 | /* |
2 | * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 | * |
5 | * This code is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License version 2 only, as |
7 | * published by the Free Software Foundation. |
8 | * |
9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
12 | * version 2 for more details (a copy is included in the LICENSE file that |
13 | * accompanied this code). |
14 | * |
15 | * You should have received a copy of the GNU General Public License version |
16 | * 2 along with this work; if not, write to the Free Software Foundation, |
17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
18 | * |
19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
20 | * or visit www.oracle.com if you need additional information or have any |
21 | * questions. |
22 | */ |
23 | |
24 | #include "precompiled.hpp" |
25 | #include "memory/allocation.hpp" |
26 | #include "runtime/synchronizer.hpp" |
27 | #include "runtime/vm_version.hpp" |
28 | #include "unittest.hpp" |
29 | |
30 | class SynchronizerTest : public ::testing::Test { |
31 | public: |
32 | static u_char* get_gvars_addr() { return ObjectSynchronizer::get_gvars_addr(); } |
33 | static u_char* get_gvars_hcSequence_addr() { return ObjectSynchronizer::get_gvars_hcSequence_addr(); } |
34 | static size_t get_gvars_size() { return ObjectSynchronizer::get_gvars_size(); } |
35 | static u_char* get_gvars_stwRandom_addr() { return ObjectSynchronizer::get_gvars_stwRandom_addr(); } |
36 | }; |
37 | |
38 | TEST_VM(SynchronizerTest, sanity) { |
39 | uint cache_line_size = VM_Version::L1_data_cache_line_size(); |
40 | if (cache_line_size != 0) { |
41 | // We were able to determine the L1 data cache line size so |
42 | // do some cache line specific sanity checks |
43 | |
44 | u_char *addr_begin = SynchronizerTest::get_gvars_addr(); |
45 | u_char *addr_stwRandom = SynchronizerTest::get_gvars_stwRandom_addr(); |
46 | u_char *addr_hcSequence = SynchronizerTest::get_gvars_hcSequence_addr(); |
47 | size_t gvars_size = SynchronizerTest::get_gvars_size(); |
48 | |
49 | uint offset_stwRandom = (uint) (addr_stwRandom - addr_begin); |
50 | uint offset_hcSequence = (uint) (addr_hcSequence - addr_begin); |
51 | uint offset_hcSequence_stwRandom = offset_hcSequence - offset_stwRandom; |
52 | uint offset_hcSequence_struct_end = (uint) gvars_size - offset_hcSequence; |
53 | |
54 | EXPECT_GE(offset_stwRandom, cache_line_size) |
55 | << "the SharedGlobals.stwRandom field is closer " |
56 | << "to the struct beginning than a cache line which permits " |
57 | << "false sharing." ; |
58 | |
59 | EXPECT_GE(offset_hcSequence_stwRandom, cache_line_size) |
60 | << "the SharedGlobals.stwRandom and " |
61 | << "SharedGlobals.hcSequence fields are closer than a cache " |
62 | << "line which permits false sharing." ; |
63 | |
64 | EXPECT_GE(offset_hcSequence_struct_end, cache_line_size) |
65 | << "the SharedGlobals.hcSequence field is closer " |
66 | << "to the struct end than a cache line which permits false " |
67 | << "sharing." ; |
68 | } |
69 | } |
70 | |