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13097 improve VM tunables for modern systems (fix mismerge)
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--- old/usr/src/uts/i86pc/sys/vm_machparam.h
+++ new/usr/src/uts/i86pc/sys/vm_machparam.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /* Copyright (c) 1988 AT&T */
22 22 /* All Rights Reserved */
23 23 /*
24 24 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
25 25 * Use is subject to license terms.
26 26 * Copyright 2017 Joyent, Inc.
27 27 */
28 28
29 29 #ifndef _SYS_VM_MACHPARAM_H
30 30 #define _SYS_VM_MACHPARAM_H
31 31
32 32 #ifdef __cplusplus
33 33 extern "C" {
34 34 #endif
35 35
36 36 /*
37 37 * Machine dependent constants for PC.
38 38 */
39 39
40 40 /*
41 41 * USRTEXT is the start of the user text/data space.
42 42 */
43 43 #define USRTEXT USRSTACK
44 44
45 45 /*
46 46 * Virtual memory related constants for UNIX resource control, all in bytes.
47 47 * The default stack size (initial stack size limit) keeps the stack from
48 48 * taking more than 2 page directory entries in addition to the part of
49 49 * the page directory entry which also maps the initial text and data,
50 50 * and makes the default slightly bigger than the 8MB on SPARC.
51 51 */
52 52 #ifdef __amd64
53 53 /*
54 54 * On amd64, the stack grows down from just below KERNELBASE (see the
55 55 * definition of USERLIMIT in i86pc/sys/machparam.h). Theoretically,
56 56 * it could grow down to the top of the VA hole (0xffff800000000000),
57 57 * giving it a possible maximum of about 125T. For an amd64 xpv
58 58 * kernel, all user VA space is below the VA hole. The theoretical
59 59 * maximum for the stack is about the same, although it can't grow
60 60 * to quite that size, since it would clash with the heap.
61 61 *
62 62 * Pick an upper limit that will work in both cases: 32T.
63 63 *
64 64 * For 32bit processes, the stack is below the text segment.
65 65 */
66 66 #define MAXSSIZ (32ULL * 1024ULL * 1024ULL * 1024ULL * 1024ULL)
67 67 #else
68 68 #define MAXSSIZ (USRSTACK - 1024*1024)
69 69 #endif /* __amd64 */
70 70 #define DFLSSIZ (8*1024*1024 + ((USRSTACK) & 0x3FFFFF))
71 71
72 72 /*
73 73 * Size of the kernel segkmem system pte table. This virtual
74 74 * space is controlled by the resource map "kernelmap".
75 75 */
76 76 #define SYSPTSIZE ((61*1024*1024) / MMU_PAGESIZE)
77 77
78 78 /*
79 79 * Size of the ethernet addressable kernel segkmem system pte table.
80 80 * This virtual space is controlled by the resource map "ekernelmap".
81 81 * The ethernet interfaces in some sun machines can address only
82 82 * the upper 16 Megabytes of memory. Since the ethernet
83 83 * driver kmem_allocs its memory, we bias all kmem_allocs
84 84 * to try ekernelmap first and if it fails try kernelmap.
85 85 * Folks that allocate directly out of kernelmap, above,
86 86 * get memory that is non-ethernet addressable.
87 87 */
88 88 #define E_SYSPTSIZE (0x2000000 / MMU_PAGESIZE)
89 89
90 90 /*
91 91 * The virtual address space to be used by the seg_map segment
92 92 * driver for fast kernel mappings.
93 93 */
94 94 #if defined(__i386)
95 95 #define SEGMAPDEFAULT (16 * 1024 * 1024)
96 96 #define SEGMAPMAX (128 * 1024 * 1024)
97 97 #else
98 98 #define SEGMAPDEFAULT (64 * 1024 * 1024)
99 99 #endif
100 100
101 101 /*
102 102 * The time for a process to be blocked before being very swappable.
103 103 * This is a number of seconds which the system takes as being a non-trivial
104 104 * amount of real time. You probably shouldn't change this;
105 105 * it is used in subtle ways (fractions and multiples of it are, that is, like
106 106 * half of a ``long time'', almost a long time, etc.)
107 107 * It is related to human patience and other factors which don't really
108 108 * change over time.
109 109 */
110 110 #define MAXSLP 20
111 111
112 112 /*
113 113 * A swapped in process is given a small amount of core without being bothered
114 114 * by the page replacement algorithm. Basically this says that if you are
115 115 * swapped in you deserve some resources. We protect the last SAFERSS
116 116 * pages against paging and will just swap you out rather than paging you.
117 117 * Note that each process has at least UPAGES pages which are not
118 118 * paged anyways so this number just means a swapped in process is
119 119 * given around 32k bytes.
120 120 */
121 121 /*
122 122 * nominal ``small'' resident set size
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123 123 * protected against replacement
124 124 */
125 125 #define SAFERSS 3
126 126
127 127 /*
128 128 * DISKRPM is used to estimate the number of paging i/o operations
129 129 * which one can expect from a single disk controller.
130 130 *
131 131 * XXX - The system doesn't account for multiple swap devices.
132 132 */
133 -#define DISKRPM 60
133 +#define DISKRPM 600
134 134
135 135 /*
136 136 * The maximum value for handspreadpages which is the the distance
137 137 * between the two clock hands in pages. This is only used when the page
138 138 * scanner is first started.
139 139 */
140 140 #define MAXHANDSPREADPAGES ((64 * 1024 * 1024) / PAGESIZE)
141 141
142 142 /*
143 143 * Paged text files that are less than PGTHRESH bytes
144 144 * may be "prefaulted in" instead of demand paged.
145 145 */
146 146 #define PGTHRESH (280 * 1024)
147 147
148 148 #ifdef __cplusplus
149 149 }
150 150 #endif
151 151
152 152 #endif /* _SYS_VM_MACHPARAM_H */
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