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 notproduct, \ 39 range, \ 40 constraint, \ 41 writeable) \ 42 \ 43 /* Whether to allow the VM to run if EXTSHM=ON. EXTSHM is an environment */ \ 44 /* variable used on AIX to activate certain hacks which allow more shm segments */\ 45 /* for 32bit processes. For 64bit processes, it is pointless and may have */ \ 46 /* harmful side effects (e.g. for some reasonn prevents allocation of 64k pages */\ 47 /* via shmctl). */ \ 48 /* Per default we quit with an error if that variable is found; for certain */ \ 49 /* customer scenarios, we may want to be able to run despite that variable. */ \ 50 product(bool, AllowExtshm, false, \ 51 "Allow VM to run with EXTSHM=ON.") \ 52 \ 53 product(intx, AttachListenerTimeout, 1000, \ 54 "Timeout in ms the attach listener waits for a request") \ 55 range(0, 2147483) \ 56 \ 57 /* Maximum expected size of the data segment. That correlates with the */ \ 58 /* to the maximum C Heap consumption we expect. */ \ 59 /* We need to know this because we need to leave "breathing space" for the */ \ 60 /* data segment when placing the java heap. If that space is too small, we */ \ 61 /* reduce our chance of getting a low heap address (needed for compressed */ \ 62 /* Oops). */ \ 63 product(uintx, MaxExpectedDataSegmentSize, (SIZE_4G * 2), \ 64 "Maximum expected Data Segment Size.") \ 65 \ 66 /* Use optimized addresses for the polling page. */ \ 67 product(bool, OptimizePollingPageLocation, true, \ 68 "Optimize the location of the polling page used for Safepoints") \ 69 \ 70 /* Use 64K pages for virtual memory (shmat). */ \ 71 product(bool, Use64KPages, true, \ 72 "Use 64K pages if available.") \ 73 \ 74 /* If VM uses 64K paged memory (shmat) for virtual memory: threshold below */ \ 75 /* which virtual memory allocations are done with 4K memory (mmap). This is */ \ 76 /* mainly for test purposes. */ \ 77 develop(uintx, Use64KPagesThreshold, 0, \ 78 "4K/64K page allocation threshold.") \ 79 \ 80 /* Normally AIX commits memory on touch, but sometimes it is helpful to have */ \ 81 /* explicit commit behaviour. This flag, if true, causes the VM to touch */ \ 82 /* memory on os::commit_memory() (which normally is a noop). */ \ 83 product(bool, UseExplicitCommit, false, \ 84 "Explicit commit for virtual memory.") \ 85 \ 86 87 88 // 89 // Defines Aix-specific default values. The flags are available on all 90 // platforms, but they may have different default values on other platforms. 91 // 92 93 // UseLargePages means nothing, for now, on AIX. 94 // Use Use64KPages or Use16MPages instead. 95 define_pd_global(bool, UseLargePages, false); 96 define_pd_global(bool, UseLargePagesIndividualAllocation, false); 97 define_pd_global(bool, UseOSErrorReporting, false); 98 define_pd_global(bool, UseThreadPriorities, true) ; 99 100 #endif // OS_AIX_VM_GLOBALS_AIX_HPP