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annotate src/share/vm/runtime/vm_version.hpp @ 10292:acac2b03a07f

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8014765: VM exits if MaxTenuringThreshold is set below the default InitialTenuringThreshold, and InitialTenuringThreshold is not set Summary: The VM exits when the condition in the subject line applies. The fix sets InitialTenuringThreshold to MaxTenuringThreshold if it is larger than MaxTenuringThreshold and InitialTenuringThreshold has not been set (is default). Reviewed-by: jwilhelm, jmasa, brutisso, johnc
author tschatzl
date Thu, 16 May 2013 23:51:51 +0200
parents b9a9ed0f8eeb
children 586fa1919a89
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1 /*
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 #ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP
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26 #define SHARE_VM_RUNTIME_VM_VERSION_HPP
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27
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28 #include "memory/allocation.hpp"
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29 #include "utilities/ostream.hpp"
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30
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31 // VM_Version provides information about the VM.
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32
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33 class Abstract_VM_Version: AllStatic {
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34 protected:
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35 friend class VMStructs;
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36 static const char* _s_vm_release;
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37 static const char* _s_internal_vm_info_string;
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38 // These are set by machine-dependent initializations
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39 static bool _supports_cx8;
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40 static bool _supports_atomic_getset4;
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41 static bool _supports_atomic_getset8;
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42 static bool _supports_atomic_getadd4;
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43 static bool _supports_atomic_getadd8;
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44 static unsigned int _logical_processors_per_package;
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45 static int _vm_major_version;
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46 static int _vm_minor_version;
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47 static int _vm_build_number;
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48 static bool _initialized;
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49 static int _parallel_worker_threads;
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50 static bool _parallel_worker_threads_initialized;
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51 static int _reserve_for_allocation_prefetch;
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52
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53 static unsigned int nof_parallel_worker_threads(unsigned int num,
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54 unsigned int dem,
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55 unsigned int switch_pt);
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56 public:
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57 static void initialize();
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58
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59 // Name
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60 static const char* vm_name();
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61 // Vendor
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62 static const char* vm_vendor();
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63 // VM version information string printed by launcher (java -version)
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64 static const char* vm_info_string();
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65 static const char* vm_release();
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66 static const char* vm_platform_string();
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67 static const char* vm_build_user();
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68
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69 static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; }
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70 static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; }
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71 static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; }
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72
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73 // Gets the jvm_version_info.jvm_version defined in jvm.h
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74 static unsigned int jvm_version();
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75
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76 // Internal version providing additional build information
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77 static const char* internal_vm_info_string();
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78 static const char* jre_release_version();
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80 // does HW support an 8-byte compare-exchange operation?
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81 static bool supports_cx8() {return _supports_cx8;}
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82 // does HW support atomic get-and-set or atomic get-and-add? Used
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83 // to guide intrinsification decisions for Unsafe atomic ops
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84 static bool supports_atomic_getset4() {return _supports_atomic_getset4;}
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85 static bool supports_atomic_getset8() {return _supports_atomic_getset8;}
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86 static bool supports_atomic_getadd4() {return _supports_atomic_getadd4;}
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87 static bool supports_atomic_getadd8() {return _supports_atomic_getadd8;}
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88
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89 static unsigned int logical_processors_per_package() {
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90 return _logical_processors_per_package;
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91 }
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92
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93 // Need a space at the end of TLAB for prefetch instructions
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94 // which may fault when accessing memory outside of heap.
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95 static int reserve_for_allocation_prefetch() {
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96 return _reserve_for_allocation_prefetch;
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97 }
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98
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99 // ARCH specific policy for the BiasedLocking
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100 static bool use_biased_locking() { return true; }
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101
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102 // Number of page sizes efficiently supported by the hardware. Most chips now
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103 // support two sizes, thus this default implementation. Processor-specific
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104 // subclasses should define new versions to hide this one as needed. Note
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105 // that the O/S may support more sizes, but at most this many are used.
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106 static uint page_size_count() { return 2; }
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107
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108 // Returns the number of parallel threads to be used for VM
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109 // work. If that number has not been calculated, do so and
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110 // save it. Returns ParallelGCThreads if it is set on the
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111 // command line.
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112 static unsigned int parallel_worker_threads();
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113 // Calculates and returns the number of parallel threads. May
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114 // be VM version specific.
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115 static unsigned int calc_parallel_worker_threads();
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116 };
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117
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118 #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP