Mercurial > hg > truffle
annotate src/share/vm/runtime/vm_version.hpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
| author | ysr |
|---|---|
| date | Wed, 23 Dec 2009 09:23:54 -0800 |
| parents | d1605aabd0a1 |
| children | c18cbe5936b8 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
| 0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // VM_Version provides information about the VM. | |
| 26 | |
| 27 class Abstract_VM_Version: AllStatic { | |
| 28 protected: | |
| 29 friend class VMStructs; | |
| 30 static const char* _s_vm_release; | |
| 31 static const char* _s_internal_vm_info_string; | |
| 32 // These are set by machine-dependent initializations | |
| 33 static bool _supports_cx8; | |
| 34 static unsigned int _logical_processors_per_package; | |
| 35 static int _vm_major_version; | |
| 36 static int _vm_minor_version; | |
| 37 static int _vm_build_number; | |
| 38 static bool _initialized; | |
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39 static int _parallel_worker_threads; |
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40 static bool _parallel_worker_threads_initialized; |
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41 |
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42 static unsigned int nof_parallel_worker_threads(unsigned int num, |
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43 unsigned int dem, |
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44 unsigned int switch_pt); |
| 0 | 45 public: |
| 46 static void initialize(); | |
| 47 | |
| 48 // Name | |
| 49 static const char* vm_name(); | |
| 50 // Vendor | |
| 51 static const char* vm_vendor(); | |
| 52 // VM version information string printed by launcher (java -version) | |
| 53 static const char* vm_info_string(); | |
| 54 static const char* vm_release(); | |
| 55 static const char* vm_platform_string(); | |
| 56 | |
| 57 static int vm_major_version() { assert(_initialized, "not initialized"); return _vm_major_version; } | |
| 58 static int vm_minor_version() { assert(_initialized, "not initialized"); return _vm_minor_version; } | |
| 59 static int vm_build_number() { assert(_initialized, "not initialized"); return _vm_build_number; } | |
| 60 | |
| 61 // Gets the jvm_version_info.jvm_version defined in jvm.h | |
| 62 static unsigned int jvm_version(); | |
| 63 | |
| 64 // Internal version providing additional build information | |
| 65 static const char* internal_vm_info_string(); | |
| 66 | |
| 67 // does HW support an 8-byte compare-exchange operation? | |
| 68 static bool supports_cx8() {return _supports_cx8;} | |
| 69 static unsigned int logical_processors_per_package() { | |
| 70 return _logical_processors_per_package; | |
| 71 } | |
| 72 | |
| 73 // Number of page sizes efficiently supported by the hardware. Most chips now | |
| 74 // support two sizes, thus this default implementation. Processor-specific | |
| 75 // subclasses should define new versions to hide this one as needed. Note | |
| 76 // that the O/S may support more sizes, but at most this many are used. | |
| 77 static uint page_size_count() { return 2; } | |
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78 |
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79 // Returns the number of parallel threads to be used for VM |
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80 // work. If that number has not been calculated, do so and |
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81 // save it. Returns ParallelGCThreads if it is set on the |
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82 // command line. |
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83 static unsigned int parallel_worker_threads(); |
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84 // Calculates and returns the number of parallel threads. May |
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85 // be VM version specific. |
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86 static unsigned int calc_parallel_worker_threads(); |
| 0 | 87 }; |