jdk8-mips64-public/hotspot: src/os/linux/vm/globals

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) 2005, 2013, 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.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef OS_LINUX_VM_GLOBALS_LINUX_HPP

    26 #define OS_LINUX_VM_GLOBALS_LINUX_HPP

    28 //

    29 // Defines Linux specific flags. They are not available on other platforms.

    30 //

    31 #define RUNTIME_OS_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct) \

    32   product(bool, UseOprofile, false,                                     \

    33         "enable support for Oprofile profiler")                         \

    34                                                                         \

    35   product(bool, UseLinuxPosixThreadCPUClocks, true,                     \

    36           "enable fast Linux Posix clocks where available")             \

    37 /*  NB: The default value of UseLinuxPosixThreadCPUClocks may be        \

    38     overridden in Arguments::parse_each_vm_init_arg.  */                \

    39                                                                         \

    40   product(bool, UseHugeTLBFS, false,                                    \

    41           "Use MAP_HUGETLB for large pages")                            \

    42                                                                         \

    43   product(bool, UseTransparentHugePages, false,                         \

    44           "Use MADV_HUGEPAGE for large pages")                          \

    45                                                                         \

    46   product(bool, LoadExecStackDllInVMThread, true,                       \

    47           "Load DLLs with executable-stack attribute in the VM Thread") \

    48                                                                         \

    49   product(bool, UseSHM, false,                                          \

    50           "Use SYSV shared memory for large pages")

    52 //

    53 // Defines Linux-specific default values. The flags are available on all

    54 // platforms, but they may have different default values on other platforms.

    55 //

    56 define_pd_global(bool, UseLargePages, true);

    57 define_pd_global(bool, UseLargePagesIndividualAllocation, false);

    58 define_pd_global(bool, UseOSErrorReporting, false);

    59 define_pd_global(bool, UseThreadPriorities, true) ;

    61 #endif // OS_LINUX_VM_GLOBALS_LINUX_HPP

src/os/linux/vm/globals_linux.hpp@4c84d351cca9

src/os/linux/vm/globals_linux.hpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/os/linux/vm/globals_linux.hpp@4c84d351cca9

src/os/linux/vm/globals_linux.hpp