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