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view src/share/vm/runtime/vm_version.hpp @ 3769:ef2d1b8f2dd4
7051430: CMS: ongoing CMS cycle should terminate abruptly to allow prompt JVM termination at exit
Summary: It turns out that there is no need to explicitly stop CMS since the JVM is taken down at a terminal safepoint during which CMS threads are (terminally) inactive. This will need to be revised if and when we evolve in the future to a point where we allow JVM reincarnation in the same process, but those changes will be much more sweeping than just terminating CMS threads. The unused ::stop() methods will be removed in a separate CR. Also include in this CR is the fix for a small typo in the spelling of UseGCLogFileRotation in a message in arguments.cpp, brought to our attention by Rainer Jung and reviewed by minqi.
Reviewed-by: johnc, jwilhelm
author | ysr |
---|---|
date | Mon, 13 Jun 2011 09:58:16 -0700 |
parents | 1d1603768966 |
children | 1af104d6cf99 |
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/* * Copyright (c) 1997, 2011, 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. * */ #ifndef SHARE_VM_RUNTIME_VM_VERSION_HPP #define SHARE_VM_RUNTIME_VM_VERSION_HPP #include "memory/allocation.hpp" #include "utilities/ostream.hpp" // VM_Version provides information about the VM. class Abstract_VM_Version: AllStatic { protected: friend class VMStructs; static const char* _s_vm_release; static const char* _s_internal_vm_info_string; // These are set by machine-dependent initializations static bool _supports_cx8; static unsigned int _logical_processors_per_package; static int _vm_major_version; static int _vm_minor_version; static int _vm_build_number; static bool _initialized; static int _parallel_worker_threads; static bool _parallel_worker_threads_initialized; static unsigned int nof_parallel_worker_threads(unsigned int num, unsigned int dem, unsigned int switch_pt); public: static void initialize(); // Name static const char* vm_name(); // Vendor static const char* vm_vendor(); // VM version information string printed by launcher (java -version) static const char* vm_info_string(); static const char* vm_release(); static const char* vm_platform_string(); static const char* vm_build_user(); static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; } static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; } static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; } // Gets the jvm_version_info.jvm_version defined in jvm.h static unsigned int jvm_version(); // Internal version providing additional build information static const char* internal_vm_info_string(); // does HW support an 8-byte compare-exchange operation? static bool supports_cx8() {return _supports_cx8;} static unsigned int logical_processors_per_package() { return _logical_processors_per_package; } // ARCH specific policy for the BiasedLocking static bool use_biased_locking() { return true; } // Number of page sizes efficiently supported by the hardware. Most chips now // support two sizes, thus this default implementation. Processor-specific // subclasses should define new versions to hide this one as needed. Note // that the O/S may support more sizes, but at most this many are used. static uint page_size_count() { return 2; } // Returns the number of parallel threads to be used for VM // work. If that number has not been calculated, do so and // save it. Returns ParallelGCThreads if it is set on the // command line. static unsigned int parallel_worker_threads(); // Calculates and returns the number of parallel threads. May // be VM version specific. static unsigned int calc_parallel_worker_threads(); }; #endif // SHARE_VM_RUNTIME_VM_VERSION_HPP