Fri, 16 Aug 2013 13:22:32 +0200
8007074: SIGSEGV at ParMarkBitMap::verify_clear()
Summary: Replace the broken large pages implementation on Linux. New flag: -XX:+UseTransparentHugePages - Linux specific flag to turn on transparent huge page hinting with madvise(..., MAP_HUGETLB). Changed behavior: -XX:+UseLargePages - tries to use -XX:+UseTransparentHugePages before trying other large pages implementations (on Linux). Changed behavior: -XX:+UseHugeTLBFS - Use upfront allocation of Large Pages instead of using the broken implementation to dynamically committing large pages. Changed behavior: -XX:LargePageSizeInBytes - Turned off the ability to use this flag on Linux and provides warning to user if set to a value different than the OS chosen large page size. Changed behavior: Setting no large page size - Now defaults to use -XX:UseTransparentHugePages if the OS supports it. Previously, -XX:+UseHugeTLBFS was chosen if the OS was configured to use large pages.
Reviewed-by: tschatzl, dcubed, brutisso
1 /*
2 * Copyright (c) 2012, 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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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23 */
25 #ifndef SHARE_VM_MEMORY_METASPACECOUNTERS_HPP
26 #define SHARE_VM_MEMORY_METASPACECOUNTERS_HPP
28 #include "memory/metaspace.hpp"
30 class MetaspacePerfCounters;
32 class MetaspaceCounters: public AllStatic {
33 static MetaspacePerfCounters* _perf_counters;
34 static size_t calculate_capacity();
36 public:
37 static void initialize_performance_counters();
38 static void update_performance_counters();
39 };
41 class CompressedClassSpaceCounters: public AllStatic {
42 static MetaspacePerfCounters* _perf_counters;
43 static size_t calculate_capacity();
44 static const Metaspace::MetadataType _class_type = Metaspace::ClassType;
46 public:
47 static void initialize_performance_counters();
48 static void update_performance_counters();
49 };
51 #endif // SHARE_VM_MEMORY_METASPACECOUNTERS_HPP