98 lines
5.5 KiB
C++
98 lines
5.5 KiB
C++
/*
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* Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2018 SAP SE. 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_AIX_VM_GLOBALS_AIX_HPP
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#define OS_AIX_VM_GLOBALS_AIX_HPP
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//
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// Defines Aix specific flags. They are not available on other platforms.
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//
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// (Please keep the switches sorted alphabetically.)
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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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diagnostic, \
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diagnostic_pd, \
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notproduct, \
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range, \
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constraint, \
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writeable) \
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\
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/* Whether to allow the VM to run if EXTSHM=ON. EXTSHM is an environment */ \
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/* variable used on AIX to activate certain hacks which allow more shm segments */\
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/* for 32bit processes. For 64bit processes, it is pointless and may have */ \
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/* harmful side effects (e.g. for some reasonn prevents allocation of 64k pages */\
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/* via shmctl). */ \
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/* Per default we quit with an error if that variable is found; for certain */ \
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/* customer scenarios, we may want to be able to run despite that variable. */ \
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product(bool, AllowExtshm, false, \
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"Allow VM to run with EXTSHM=ON.") \
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\
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/* Maximum expected size of the data segment. That correlates with the */ \
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/* to the maximum C Heap consumption we expect. */ \
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/* We need to know this because we need to leave "breathing space" for the */ \
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/* data segment when placing the java heap. If that space is too small, we */ \
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/* reduce our chance of getting a low heap address (needed for compressed */ \
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/* Oops). */ \
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product(uintx, MaxExpectedDataSegmentSize, 8*G, \
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"Maximum expected Data Segment Size.") \
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\
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/* Use optimized addresses for the polling page. */ \
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product(bool, OptimizePollingPageLocation, true, \
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"Optimize the location of the polling page used for Safepoints") \
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\
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/* Use 64K pages for virtual memory (shmat). */ \
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product(bool, Use64KPages, true, \
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"Use 64K pages if available.") \
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\
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/* If VM uses 64K paged memory (shmat) for virtual memory: threshold below */ \
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/* which virtual memory allocations are done with 4K memory (mmap). This is */ \
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/* mainly for test purposes. */ \
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develop(uintx, Use64KPagesThreshold, 0, \
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"4K/64K page allocation threshold.") \
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\
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/* Normally AIX commits memory on touch, but sometimes it is helpful to have */ \
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/* explicit commit behaviour. This flag, if true, causes the VM to touch */ \
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/* memory on os::commit_memory() (which normally is a noop). */ \
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product(bool, UseExplicitCommit, false, \
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"Explicit commit for virtual memory.") \
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\
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//
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// Defines Aix-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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// UseLargePages means nothing, for now, on AIX.
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// Use Use64KPages or Use16MPages instead.
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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, UseOSErrorReporting, false);
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define_pd_global(bool, UseThreadPriorities, true) ;
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#endif // OS_AIX_VM_GLOBALS_AIX_HPP
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