1/* 2 * Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved. 3 * Copyright (c) 2012, 2015 SAP SE. All rights reserved. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26#ifndef OS_AIX_VM_GLOBALS_AIX_HPP 27#define OS_AIX_VM_GLOBALS_AIX_HPP 28 29// 30// Defines Aix specific flags. They are not available on other platforms. 31// 32// (Please keep the switches sorted alphabetically.) 33#define RUNTIME_OS_FLAGS(develop, \ 34 develop_pd, \ 35 product, \ 36 product_pd, \ 37 diagnostic, \ 38 diagnostic_pd, \ 39 notproduct, \ 40 range, \ 41 constraint, \ 42 writeable) \ 43 \ 44 /* Whether to allow the VM to run if EXTSHM=ON. EXTSHM is an environment */ \ 45 /* variable used on AIX to activate certain hacks which allow more shm segments */\ 46 /* for 32bit processes. For 64bit processes, it is pointless and may have */ \ 47 /* harmful side effects (e.g. for some reasonn prevents allocation of 64k pages */\ 48 /* via shmctl). */ \ 49 /* Per default we quit with an error if that variable is found; for certain */ \ 50 /* customer scenarios, we may want to be able to run despite that variable. */ \ 51 product(bool, AllowExtshm, false, \ 52 "Allow VM to run with EXTSHM=ON.") \ 53 \ 54 product(intx, AttachListenerTimeout, 1000, \ 55 "Timeout in ms the attach listener waits for a request") \ 56 range(0, 2147483) \ 57 \ 58 /* Maximum expected size of the data segment. That correlates with the */ \ 59 /* to the maximum C Heap consumption we expect. */ \ 60 /* We need to know this because we need to leave "breathing space" for the */ \ 61 /* data segment when placing the java heap. If that space is too small, we */ \ 62 /* reduce our chance of getting a low heap address (needed for compressed */ \ 63 /* Oops). */ \ 64 product(uintx, MaxExpectedDataSegmentSize, 8*G, \ 65 "Maximum expected Data Segment Size.") \ 66 \ 67 /* Use optimized addresses for the polling page. */ \ 68 product(bool, OptimizePollingPageLocation, true, \ 69 "Optimize the location of the polling page used for Safepoints") \ 70 \ 71 /* Use 64K pages for virtual memory (shmat). */ \ 72 product(bool, Use64KPages, true, \ 73 "Use 64K pages if available.") \ 74 \ 75 /* If VM uses 64K paged memory (shmat) for virtual memory: threshold below */ \ 76 /* which virtual memory allocations are done with 4K memory (mmap). This is */ \ 77 /* mainly for test purposes. */ \ 78 develop(uintx, Use64KPagesThreshold, 0, \ 79 "4K/64K page allocation threshold.") \ 80 \ 81 /* Normally AIX commits memory on touch, but sometimes it is helpful to have */ \ 82 /* explicit commit behaviour. This flag, if true, causes the VM to touch */ \ 83 /* memory on os::commit_memory() (which normally is a noop). */ \ 84 product(bool, UseExplicitCommit, false, \ 85 "Explicit commit for virtual memory.") \ 86 \ 87 88 89// 90// Defines Aix-specific default values. The flags are available on all 91// platforms, but they may have different default values on other platforms. 92// 93 94// UseLargePages means nothing, for now, on AIX. 95// Use Use64KPages or Use16MPages instead. 96define_pd_global(bool, UseLargePages, false); 97define_pd_global(bool, UseLargePagesIndividualAllocation, false); 98define_pd_global(bool, UseOSErrorReporting, false); 99define_pd_global(bool, UseThreadPriorities, true) ; 100 101#endif // OS_AIX_VM_GLOBALS_AIX_HPP 102