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subr_param.c (204278) subr_param.c (204420)
1/*-
2 * Copyright (c) 1980, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)param.c 8.3 (Berkeley) 8/20/94
35 */
36
37#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 1980, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)param.c 8.3 (Berkeley) 8/20/94
35 */
36
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/sys/kern/subr_param.c 204278 2010-02-24 15:52:18Z brooks $");
38__FBSDID("$FreeBSD: head/sys/kern/subr_param.c 204420 2010-02-27 18:00:57Z alc $");
39
40#include "opt_param.h"
41#include "opt_maxusers.h"
42
43#include <sys/limits.h>
44#include <sys/param.h>
45#include <sys/systm.h>
46#include <sys/kernel.h>
47#include <sys/sysctl.h>
48
49#include <vm/vm_param.h>
50
51/*
52 * System parameter formulae.
53 */
54
55#ifndef HZ
56# if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__)
57# define HZ 1000
58# else
59# define HZ 100
60# endif
61# ifndef HZ_VM
62# define HZ_VM 100
63# endif
64#else
65# ifndef HZ_VM
66# define HZ_VM HZ
67# endif
68#endif
69#define NPROC (20 + 16 * maxusers)
70#ifndef NBUF
71#define NBUF 0
72#endif
73#ifndef MAXFILES
74#define MAXFILES (maxproc * 2)
75#endif
76
39
40#include "opt_param.h"
41#include "opt_maxusers.h"
42
43#include <sys/limits.h>
44#include <sys/param.h>
45#include <sys/systm.h>
46#include <sys/kernel.h>
47#include <sys/sysctl.h>
48
49#include <vm/vm_param.h>
50
51/*
52 * System parameter formulae.
53 */
54
55#ifndef HZ
56# if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__)
57# define HZ 1000
58# else
59# define HZ 100
60# endif
61# ifndef HZ_VM
62# define HZ_VM 100
63# endif
64#else
65# ifndef HZ_VM
66# define HZ_VM HZ
67# endif
68#endif
69#define NPROC (20 + 16 * maxusers)
70#ifndef NBUF
71#define NBUF 0
72#endif
73#ifndef MAXFILES
74#define MAXFILES (maxproc * 2)
75#endif
76
77/* Values of enum VM_GUEST members are used as indices in
78 * vm_guest_sysctl_names */
79enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN };
80
81static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS);
82
83int hz;
84int tick;
85int maxusers; /* base tunable */
86int maxproc; /* maximum # of processes */
87int maxprocperuid; /* max # of procs per user */
88int maxfiles; /* sys. wide open files limit */
89int maxfilesperproc; /* per-proc open files limit */
90int ncallout; /* maximum # of timer events */
91int nbuf;
92int ngroups_max; /* max # groups per process */
93int nswbuf;
94long maxswzone; /* max swmeta KVA storage */
95long maxbcache; /* max buffer cache KVA storage */
96long maxpipekva; /* Limit on pipe KVA */
97int vm_guest; /* Running as virtual machine guest? */
98u_long maxtsiz; /* max text size */
99u_long dfldsiz; /* initial data size limit */
100u_long maxdsiz; /* max data size */
101u_long dflssiz; /* initial stack size limit */
102u_long maxssiz; /* max stack size */
103u_long sgrowsiz; /* amount to grow stack */
104
105SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0,
106 "Number of clock ticks per second");
107SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0,
108 "Number of pre-allocated timer events");
109SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0,
110 "Number of buffers in the buffer cache");
111SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0,
112 "Number of swap buffers");
113SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0,
114 "Maximum memory for swap metadata");
115SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0,
116 "Maximum value of vfs.maxbufspace");
117SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0,
118 "Maximum text size");
119SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0,
120 "Initial data size limit");
121SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0,
122 "Maximum data size");
123SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0,
124 "Initial stack size limit");
125SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0,
126 "Maximum stack size");
127SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0,
128 "Amount to grow stack on a stack fault");
129SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING,
130 NULL, 0, sysctl_kern_vm_guest, "A",
131 "Virtual machine detected? (none|generic|xen)");
132
133/*
134 * These have to be allocated somewhere; allocating
135 * them here forces loader errors if this file is omitted
136 * (if they've been externed everywhere else; hah!).
137 */
138struct buf *swbuf;
139
77static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS);
78
79int hz;
80int tick;
81int maxusers; /* base tunable */
82int maxproc; /* maximum # of processes */
83int maxprocperuid; /* max # of procs per user */
84int maxfiles; /* sys. wide open files limit */
85int maxfilesperproc; /* per-proc open files limit */
86int ncallout; /* maximum # of timer events */
87int nbuf;
88int ngroups_max; /* max # groups per process */
89int nswbuf;
90long maxswzone; /* max swmeta KVA storage */
91long maxbcache; /* max buffer cache KVA storage */
92long maxpipekva; /* Limit on pipe KVA */
93int vm_guest; /* Running as virtual machine guest? */
94u_long maxtsiz; /* max text size */
95u_long dfldsiz; /* initial data size limit */
96u_long maxdsiz; /* max data size */
97u_long dflssiz; /* initial stack size limit */
98u_long maxssiz; /* max stack size */
99u_long sgrowsiz; /* amount to grow stack */
100
101SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0,
102 "Number of clock ticks per second");
103SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0,
104 "Number of pre-allocated timer events");
105SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0,
106 "Number of buffers in the buffer cache");
107SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0,
108 "Number of swap buffers");
109SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0,
110 "Maximum memory for swap metadata");
111SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0,
112 "Maximum value of vfs.maxbufspace");
113SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0,
114 "Maximum text size");
115SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0,
116 "Initial data size limit");
117SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0,
118 "Maximum data size");
119SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0,
120 "Initial stack size limit");
121SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0,
122 "Maximum stack size");
123SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0,
124 "Amount to grow stack on a stack fault");
125SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING,
126 NULL, 0, sysctl_kern_vm_guest, "A",
127 "Virtual machine detected? (none|generic|xen)");
128
129/*
130 * These have to be allocated somewhere; allocating
131 * them here forces loader errors if this file is omitted
132 * (if they've been externed everywhere else; hah!).
133 */
134struct buf *swbuf;
135
136/*
137 * The elements of this array are ordered based upon the values of the
138 * corresponding enum VM_GUEST members.
139 */
140static const char *const vm_guest_sysctl_names[] = {
141 "none",
142 "generic",
143 "xen",
144 NULL
145};
146
147#ifndef XEN
148static const char *const vm_bnames[] = {
149 "QEMU", /* QEMU */
150 "Plex86", /* Plex86 */
151 "Bochs", /* Bochs */
152 NULL
153};
154
155static const char *const vm_pnames[] = {
156 "VMware Virtual Platform", /* VMWare VM */
157 "Virtual Machine", /* Microsoft VirtualPC */
158 "VirtualBox", /* Sun xVM VirtualBox */
159 "Parallels Virtual Platform", /* Parallels VM */
160 NULL
161};
162
163
164/*
165 * Detect known Virtual Machine hosts by inspecting the emulated BIOS.
166 */
167static enum VM_GUEST
168detect_virtual(void)
169{
170 char *sysenv;
171 int i;
172
173 sysenv = getenv("smbios.bios.vendor");
174 if (sysenv != NULL) {
175 for (i = 0; vm_bnames[i] != NULL; i++)
176 if (strcmp(sysenv, vm_bnames[i]) == 0) {
177 freeenv(sysenv);
178 return (VM_GUEST_VM);
179 }
180 freeenv(sysenv);
181 }
182 sysenv = getenv("smbios.system.product");
183 if (sysenv != NULL) {
184 for (i = 0; vm_pnames[i] != NULL; i++)
185 if (strcmp(sysenv, vm_pnames[i]) == 0) {
186 freeenv(sysenv);
187 return (VM_GUEST_VM);
188 }
189 freeenv(sysenv);
190 }
191 return (VM_GUEST_NO);
192}
193#endif
194
195/*
196 * Boot time overrides that are not scaled against main memory
197 */
198void
199init_param1(void)
200{
201#ifndef XEN
202 vm_guest = detect_virtual();
203#else
204 vm_guest = VM_GUEST_XEN;
205#endif
206 hz = -1;
207 TUNABLE_INT_FETCH("kern.hz", &hz);
208 if (hz == -1)
209 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;
210 tick = 1000000 / hz;
211
212#ifdef VM_SWZONE_SIZE_MAX
213 maxswzone = VM_SWZONE_SIZE_MAX;
214#endif
215 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
216#ifdef VM_BCACHE_SIZE_MAX
217 maxbcache = VM_BCACHE_SIZE_MAX;
218#endif
219 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);
220
221 maxtsiz = MAXTSIZ;
222 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
223 dfldsiz = DFLDSIZ;
224 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
225 maxdsiz = MAXDSIZ;
226 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
227 dflssiz = DFLSSIZ;
228 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
229 maxssiz = MAXSSIZ;
230 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
231 sgrowsiz = SGROWSIZ;
232 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
233
234 /*
235 * Let the administrator set {NGROUPS_MAX}, but disallow values
236 * less than NGROUPS_MAX which would violate POSIX.1-2008 or
237 * greater than INT_MAX-1 which would result in overflow.
238 */
239 ngroups_max = NGROUPS_MAX;
240 TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max);
241 if (ngroups_max < NGROUPS_MAX)
242 ngroups_max = NGROUPS_MAX;
243}
244
245/*
246 * Boot time overrides that are scaled against main memory
247 */
248void
249init_param2(long physpages)
250{
251
252 /* Base parameters */
253 maxusers = MAXUSERS;
254 TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
255 if (maxusers == 0) {
256 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
257 if (maxusers < 32)
258 maxusers = 32;
259 if (maxusers > 384)
260 maxusers = 384;
261 }
262
263 /*
264 * The following can be overridden after boot via sysctl. Note:
265 * unless overriden, these macros are ultimately based on maxusers.
266 */
267 maxproc = NPROC;
268 TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
269 /*
270 * Limit maxproc so that kmap entries cannot be exhausted by
271 * processes.
272 */
273 if (maxproc > (physpages / 12))
274 maxproc = physpages / 12;
275 maxfiles = MAXFILES;
276 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
277 maxprocperuid = (maxproc * 9) / 10;
278 maxfilesperproc = (maxfiles * 9) / 10;
279
280 /*
281 * Cannot be changed after boot.
282 */
283 nbuf = NBUF;
284 TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
285
286 ncallout = 16 + maxproc + maxfiles;
287 TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
288}
289
290/*
291 * Boot time overrides that are scaled against the kmem map
292 */
293void
294init_param3(long kmempages)
295{
296
297 /*
298 * The default for maxpipekva is max(5% of the kmem map, 512KB).
299 * See sys_pipe.c for more details.
300 */
301 maxpipekva = (kmempages / 20) * PAGE_SIZE;
302 if (maxpipekva < 512 * 1024)
303 maxpipekva = 512 * 1024;
304 TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
305}
306
307/*
308 * Sysctl stringiying handler for kern.vm_guest.
309 */
310static int
311sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS)
312{
313 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest],
314 strlen(vm_guest_sysctl_names[vm_guest])));
315}
140static const char *const vm_guest_sysctl_names[] = {
141 "none",
142 "generic",
143 "xen",
144 NULL
145};
146
147#ifndef XEN
148static const char *const vm_bnames[] = {
149 "QEMU", /* QEMU */
150 "Plex86", /* Plex86 */
151 "Bochs", /* Bochs */
152 NULL
153};
154
155static const char *const vm_pnames[] = {
156 "VMware Virtual Platform", /* VMWare VM */
157 "Virtual Machine", /* Microsoft VirtualPC */
158 "VirtualBox", /* Sun xVM VirtualBox */
159 "Parallels Virtual Platform", /* Parallels VM */
160 NULL
161};
162
163
164/*
165 * Detect known Virtual Machine hosts by inspecting the emulated BIOS.
166 */
167static enum VM_GUEST
168detect_virtual(void)
169{
170 char *sysenv;
171 int i;
172
173 sysenv = getenv("smbios.bios.vendor");
174 if (sysenv != NULL) {
175 for (i = 0; vm_bnames[i] != NULL; i++)
176 if (strcmp(sysenv, vm_bnames[i]) == 0) {
177 freeenv(sysenv);
178 return (VM_GUEST_VM);
179 }
180 freeenv(sysenv);
181 }
182 sysenv = getenv("smbios.system.product");
183 if (sysenv != NULL) {
184 for (i = 0; vm_pnames[i] != NULL; i++)
185 if (strcmp(sysenv, vm_pnames[i]) == 0) {
186 freeenv(sysenv);
187 return (VM_GUEST_VM);
188 }
189 freeenv(sysenv);
190 }
191 return (VM_GUEST_NO);
192}
193#endif
194
195/*
196 * Boot time overrides that are not scaled against main memory
197 */
198void
199init_param1(void)
200{
201#ifndef XEN
202 vm_guest = detect_virtual();
203#else
204 vm_guest = VM_GUEST_XEN;
205#endif
206 hz = -1;
207 TUNABLE_INT_FETCH("kern.hz", &hz);
208 if (hz == -1)
209 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;
210 tick = 1000000 / hz;
211
212#ifdef VM_SWZONE_SIZE_MAX
213 maxswzone = VM_SWZONE_SIZE_MAX;
214#endif
215 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
216#ifdef VM_BCACHE_SIZE_MAX
217 maxbcache = VM_BCACHE_SIZE_MAX;
218#endif
219 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);
220
221 maxtsiz = MAXTSIZ;
222 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
223 dfldsiz = DFLDSIZ;
224 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
225 maxdsiz = MAXDSIZ;
226 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
227 dflssiz = DFLSSIZ;
228 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
229 maxssiz = MAXSSIZ;
230 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
231 sgrowsiz = SGROWSIZ;
232 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
233
234 /*
235 * Let the administrator set {NGROUPS_MAX}, but disallow values
236 * less than NGROUPS_MAX which would violate POSIX.1-2008 or
237 * greater than INT_MAX-1 which would result in overflow.
238 */
239 ngroups_max = NGROUPS_MAX;
240 TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max);
241 if (ngroups_max < NGROUPS_MAX)
242 ngroups_max = NGROUPS_MAX;
243}
244
245/*
246 * Boot time overrides that are scaled against main memory
247 */
248void
249init_param2(long physpages)
250{
251
252 /* Base parameters */
253 maxusers = MAXUSERS;
254 TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
255 if (maxusers == 0) {
256 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
257 if (maxusers < 32)
258 maxusers = 32;
259 if (maxusers > 384)
260 maxusers = 384;
261 }
262
263 /*
264 * The following can be overridden after boot via sysctl. Note:
265 * unless overriden, these macros are ultimately based on maxusers.
266 */
267 maxproc = NPROC;
268 TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
269 /*
270 * Limit maxproc so that kmap entries cannot be exhausted by
271 * processes.
272 */
273 if (maxproc > (physpages / 12))
274 maxproc = physpages / 12;
275 maxfiles = MAXFILES;
276 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
277 maxprocperuid = (maxproc * 9) / 10;
278 maxfilesperproc = (maxfiles * 9) / 10;
279
280 /*
281 * Cannot be changed after boot.
282 */
283 nbuf = NBUF;
284 TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
285
286 ncallout = 16 + maxproc + maxfiles;
287 TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
288}
289
290/*
291 * Boot time overrides that are scaled against the kmem map
292 */
293void
294init_param3(long kmempages)
295{
296
297 /*
298 * The default for maxpipekva is max(5% of the kmem map, 512KB).
299 * See sys_pipe.c for more details.
300 */
301 maxpipekva = (kmempages / 20) * PAGE_SIZE;
302 if (maxpipekva < 512 * 1024)
303 maxpipekva = 512 * 1024;
304 TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
305}
306
307/*
308 * Sysctl stringiying handler for kern.vm_guest.
309 */
310static int
311sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS)
312{
313 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest],
314 strlen(vm_guest_sysctl_names[vm_guest])));
315}