104 lines
6.0 KiB
C++
104 lines
6.0 KiB
C++
/*
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* Copyright (c) 2005, 2025, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef OS_LINUX_GLOBALS_LINUX_HPP
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#define OS_LINUX_GLOBALS_LINUX_HPP
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//
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// Declare Linux specific flags. They are not available on other platforms.
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//
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#define RUNTIME_OS_FLAGS(develop, \
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develop_pd, \
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product, \
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product_pd, \
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range, \
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constraint) \
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\
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product(bool, UseTransparentHugePages, false, \
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"Use MADV_HUGEPAGE for large pages") \
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\
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product(bool, LoadExecStackDllInVMThread, true, \
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"Load DLLs with executable-stack attribute in the VM Thread") \
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\
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product(bool, UseContainerSupport, true, \
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"Enable detection and runtime container configuration support") \
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\
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product(bool, AdjustStackSizeForTLS, false, \
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"Increase the thread stack size to include space for glibc " \
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"static thread-local storage (TLS) if true") \
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\
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product(bool, DumpPrivateMappingsInCore, true, DIAGNOSTIC, \
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"If true, sets bit 2 of /proc/PID/coredump_filter, thus " \
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"resulting in file-backed private mappings of the process to "\
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"be dumped into the corefile.") \
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\
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product(bool, DumpSharedMappingsInCore, true, DIAGNOSTIC, \
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"If true, sets bit 3 of /proc/PID/coredump_filter, thus " \
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"resulting in file-backed shared mappings of the process to " \
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"be dumped into the corefile.") \
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\
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product(bool, UseCpuAllocPath, false, DIAGNOSTIC, \
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"Use CPU_ALLOC code path in os::active_processor_count ") \
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\
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product(bool, DumpPerfMapAtExit, false, DIAGNOSTIC, \
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"Write map file for Linux perf tool at exit") \
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\
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product(intx, TimerSlack, -1, EXPERIMENTAL, \
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"Overrides the timer slack value to the given number of " \
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"nanoseconds. Lower value provides more accurate " \
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"high-precision timers, at the expense of (possibly) worse " \
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"power efficiency. In current Linux, 0 means using the " \
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"system-wide default, which would disable the override, but " \
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"VM would still print the current timer slack values. Use -1 "\
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"to disable both the override and the printouts." \
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"See prctl(PR_SET_TIMERSLACK) for more info.") \
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\
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product(bool, THPStackMitigation, true, DIAGNOSTIC, \
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"If THPs are unconditionally enabled on the system (mode " \
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"\"always\"), the JVM will prevent THP from forming in " \
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"thread stacks. When disabled, the absence of this mitigation"\
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"allows THPs to form in thread stacks.") \
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\
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develop(bool, DelayThreadStartALot, false, \
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"Artificially delay thread starts randomly for testing.") \
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\
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product(bool, UseMadvPopulateWrite, true, DIAGNOSTIC, \
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"Use MADV_POPULATE_WRITE in os::pd_pretouch_memory.") \
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\
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product(bool, PrintMemoryMapAtExit, false, DIAGNOSTIC, \
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"Print an annotated memory map at exit") \
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\
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// end of RUNTIME_OS_FLAGS
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//
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// Defines Linux-specific default values. The flags are available on all
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// platforms, but they may have different default values on other platforms.
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//
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define_pd_global(size_t, PreTouchParallelChunkSize, 4 * M);
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define_pd_global(bool, UseLargePages, false);
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define_pd_global(bool, UseLargePagesIndividualAllocation, false);
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define_pd_global(bool, UseThreadPriorities, true) ;
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#endif // OS_LINUX_GLOBALS_LINUX_HPP
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