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annotate src/os/linux/vm/globals_linux.hpp @ 12110:4c84d351cca9

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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
author stefank
date Fri, 16 Aug 2013 13:22:32 +0200
parents 9058789475af
children 263f2c796d6c
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1 /*
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2 * Copyright (c) 2005, 2013, 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 OS_LINUX_VM_GLOBALS_LINUX_HPP
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26 #define OS_LINUX_VM_GLOBALS_LINUX_HPP
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27
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28 //
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29 // Defines Linux specific flags. They are not available on other platforms.
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30 //
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31 #define RUNTIME_OS_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct) \
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32 product(bool, UseOprofile, false, \
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33 "enable support for Oprofile profiler") \
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34 \
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35 product(bool, UseLinuxPosixThreadCPUClocks, true, \
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36 "enable fast Linux Posix clocks where available") \
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37 /* NB: The default value of UseLinuxPosixThreadCPUClocks may be \
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38 overridden in Arguments::parse_each_vm_init_arg. */ \
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39 \
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40 product(bool, UseHugeTLBFS, false, \
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41 "Use MAP_HUGETLB for large pages") \
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42 \
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43 product(bool, UseTransparentHugePages, false, \
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44 "Use MADV_HUGEPAGE for large pages") \
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45 \
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46 product(bool, LoadExecStackDllInVMThread, true, \
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47 "Load DLLs with executable-stack attribute in the VM Thread") \
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48 \
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49 product(bool, UseSHM, false, \
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50 "Use SYSV shared memory for large pages")
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51
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52 //
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53 // Defines Linux-specific default values. The flags are available on all
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54 // platforms, but they may have different default values on other platforms.
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55 //
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56 define_pd_global(bool, UseLargePages, true);
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57 define_pd_global(bool, UseLargePagesIndividualAllocation, false);
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58 define_pd_global(bool, UseOSErrorReporting, false);
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59 define_pd_global(bool, UseThreadPriorities, true) ;
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60
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61 #endif // OS_LINUX_VM_GLOBALS_LINUX_HPP