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/*
* Copyright (c) 2005, 2022, 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 OS_LINUX_GLOBALS_LINUX_HPP
#define OS_LINUX_GLOBALS_LINUX_HPP
//
// Declare Linux specific flags. They are not available on other platforms.
//
#define RUNTIME_OS_FLAGS(develop, \
develop_pd, \
product, \
product_pd, \
notproduct, \
range, \
constraint) \
\
product(bool, UseOprofile, false, \
"enable support for Oprofile profiler") \
\
/* NB: The default value of UseLinuxPosixThreadCPUClocks may be */ \
/* overridden in Arguments::parse_each_vm_init_arg. */ \
product(bool, UseLinuxPosixThreadCPUClocks, true, \
"enable fast Linux Posix clocks where available") \
\
product(bool, UseHugeTLBFS, false, \
"Use MAP_HUGETLB for large pages") \
\
product(bool, UseTransparentHugePages, false, \
"Use MADV_HUGEPAGE for large pages") \
\
product(bool, LoadExecStackDllInVMThread, true, \
"Load DLLs with executable-stack attribute in the VM Thread") \
\
product(bool, UseSHM, false, \
"Use SYSV shared memory for large pages") \
\
product(bool, UseContainerSupport, true, \
"Enable detection and runtime container configuration support") \
\
product(bool, AdjustStackSizeForTLS, false, \
"Increase the thread stack size to include space for glibc " \
"static thread-local storage (TLS) if true") \
\
product(bool, DumpPrivateMappingsInCore, true, DIAGNOSTIC, \
"If true, sets bit 2 of /proc/PID/coredump_filter, thus " \
"resulting in file-backed private mappings of the process to "\
"be dumped into the corefile.") \
\
product(bool, DumpSharedMappingsInCore, true, DIAGNOSTIC, \
"If true, sets bit 3 of /proc/PID/coredump_filter, thus " \
"resulting in file-backed shared mappings of the process to " \
"be dumped into the corefile.") \
\
product(bool, UseCpuAllocPath, false, DIAGNOSTIC, \
"Use CPU_ALLOC code path in os::active_processor_count ") \
\
product(bool, DumpPerfMapAtExit, false, DIAGNOSTIC, \
"Write map file for Linux perf tool at exit")
// end of RUNTIME_OS_FLAGS
//
// Defines Linux-specific default values. The flags are available on all
// platforms, but they may have different default values on other platforms.
//
define_pd_global(size_t, PreTouchParallelChunkSize, 4 * M);
define_pd_global(bool, UseLargePages, false);
define_pd_global(bool, UseLargePagesIndividualAllocation, false);
define_pd_global(bool, UseThreadPriorities, true) ;
#endif // OS_LINUX_GLOBALS_LINUX_HPP
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