| /* |
| * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. |
| * Copyright 2012, 2015 SAP AG. 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_AIX_VM_GLOBALS_AIX_HPP |
| #define OS_AIX_VM_GLOBALS_AIX_HPP |
| |
| // |
| // Defines Aix specific flags. They are not available on other platforms. |
| // |
| // (Please keep the switches sorted alphabetically.) |
| #define RUNTIME_OS_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct, range, constraint) \ |
| \ |
| /* Whether to allow the VM to run if EXTSHM=ON. EXTSHM is an environment */ \ |
| /* variable used on AIX to activate certain hacks which allow more shm segments */\ |
| /* for 32bit processes. For 64bit processes, it is pointless and may have */ \ |
| /* harmful side effects (e.g. for some reasonn prevents allocation of 64k pages */\ |
| /* via shmctl). */ \ |
| /* Per default we quit with an error if that variable is found; for certain */ \ |
| /* customer scenarios, we may want to be able to run despite that variable. */ \ |
| product(bool, AllowExtshm, false, \ |
| "Allow VM to run with EXTSHM=ON.") \ |
| \ |
| product(intx, AttachListenerTimeout, 1000, \ |
| "Timeout in ms the attach listener waits for a request") \ |
| range(0, 2147483) \ |
| \ |
| /* Maximum expected size of the data segment. That correlates with the */ \ |
| /* to the maximum C Heap consumption we expect. */ \ |
| /* We need to know this because we need to leave "breathing space" for the */ \ |
| /* data segment when placing the java heap. If that space is too small, we */ \ |
| /* reduce our chance of getting a low heap address (needed for compressed */ \ |
| /* Oops). */ \ |
| product(uintx, MaxExpectedDataSegmentSize, (SIZE_4G * 2), \ |
| "Maximum expected Data Segment Size.") \ |
| \ |
| /* Use optimized addresses for the polling page. */ \ |
| product(bool, OptimizePollingPageLocation, true, \ |
| "Optimize the location of the polling page used for Safepoints") \ |
| \ |
| /* Use 64K pages for virtual memory (shmat). */ \ |
| product(bool, Use64KPages, true, \ |
| "Use 64K pages if available.") \ |
| \ |
| /* If VM uses 64K paged memory (shmat) for virtual memory: threshold below */ \ |
| /* which virtual memory allocations are done with 4K memory (mmap). This is */ \ |
| /* mainly for test purposes. */ \ |
| develop(uintx, Use64KPagesThreshold, 0, \ |
| "4K/64K page allocation threshold.") \ |
| \ |
| /* Normally AIX commits memory on touch, but sometimes it is helpful to have */ \ |
| /* explicit commit behaviour. This flag, if true, causes the VM to touch */ \ |
| /* memory on os::commit_memory() (which normally is a noop). */ \ |
| product(bool, UseExplicitCommit, false, \ |
| "Explicit commit for virtual memory.") \ |
| \ |
| |
| |
| // |
| // Defines Aix-specific default values. The flags are available on all |
| // platforms, but they may have different default values on other platforms. |
| // |
| |
| // UseLargePages means nothing, for now, on AIX. |
| // Use Use64KPages or Use16MPages instead. |
| define_pd_global(bool, UseLargePages, false); |
| define_pd_global(bool, UseLargePagesIndividualAllocation, false); |
| define_pd_global(bool, UseOSErrorReporting, false); |
| define_pd_global(bool, UseThreadPriorities, true) ; |
| |
| #endif // OS_AIX_VM_GLOBALS_AIX_HPP |