Deleted Added
full compact
subr_param.c (245469) subr_param.c (245575)
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 245469 2013-01-15 19:26:17Z alfred $");
38__FBSDID("$FreeBSD: head/sys/kern/subr_param.c 245575 2013-01-17 21:28:31Z andre $");
39
40#include "opt_param.h"
41#include "opt_msgbuf.h"
42#include "opt_maxusers.h"
43
44#include <sys/param.h>
45#include <sys/systm.h>
46#include <sys/kernel.h>
47#include <sys/limits.h>
48#include <sys/msgbuf.h>
49#include <sys/sysctl.h>
50#include <sys/proc.h>
51
52#include <vm/vm.h>
53#include <vm/vm_param.h>
54#include <vm/pmap.h>
55
56/*
57 * System parameter formulae.
58 */
59
60#ifndef HZ
61# if defined(__mips__) || defined(__arm__)
62# define HZ 100
63# else
64# define HZ 1000
65# endif
66# ifndef HZ_VM
67# define HZ_VM 100
68# endif
69#else
70# ifndef HZ_VM
71# define HZ_VM HZ
72# endif
73#endif
74#define NPROC (20 + 16 * maxusers)
75#ifndef NBUF
76#define NBUF 0
77#endif
78#ifndef MAXFILES
79#define MAXFILES (maxproc * 2)
80#endif
81
82static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS);
83
84int hz;
85int tick;
86int maxusers; /* base tunable */
87int maxproc; /* maximum # of processes */
88int maxprocperuid; /* max # of procs per user */
89int maxfiles; /* sys. wide open files limit */
90int maxfilesperproc; /* per-proc open files limit */
91int msgbufsize; /* size of kernel message buffer */
92int ncallout; /* maximum # of timer events */
93int nbuf;
94int ngroups_max; /* max # groups per process */
95int nswbuf;
39
40#include "opt_param.h"
41#include "opt_msgbuf.h"
42#include "opt_maxusers.h"
43
44#include <sys/param.h>
45#include <sys/systm.h>
46#include <sys/kernel.h>
47#include <sys/limits.h>
48#include <sys/msgbuf.h>
49#include <sys/sysctl.h>
50#include <sys/proc.h>
51
52#include <vm/vm.h>
53#include <vm/vm_param.h>
54#include <vm/pmap.h>
55
56/*
57 * System parameter formulae.
58 */
59
60#ifndef HZ
61# if defined(__mips__) || defined(__arm__)
62# define HZ 100
63# else
64# define HZ 1000
65# endif
66# ifndef HZ_VM
67# define HZ_VM 100
68# endif
69#else
70# ifndef HZ_VM
71# define HZ_VM HZ
72# endif
73#endif
74#define NPROC (20 + 16 * maxusers)
75#ifndef NBUF
76#define NBUF 0
77#endif
78#ifndef MAXFILES
79#define MAXFILES (maxproc * 2)
80#endif
81
82static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS);
83
84int hz;
85int tick;
86int maxusers; /* base tunable */
87int maxproc; /* maximum # of processes */
88int maxprocperuid; /* max # of procs per user */
89int maxfiles; /* sys. wide open files limit */
90int maxfilesperproc; /* per-proc open files limit */
91int msgbufsize; /* size of kernel message buffer */
92int ncallout; /* maximum # of timer events */
93int nbuf;
94int ngroups_max; /* max # groups per process */
95int nswbuf;
96quad_t maxmbufmem; /* max mbuf memory */
97pid_t pid_max = PID_MAX;
98long maxswzone; /* max swmeta KVA storage */
99long maxbcache; /* max buffer cache KVA storage */
100long maxpipekva; /* Limit on pipe KVA */
101int vm_guest; /* Running as virtual machine guest? */
102u_long maxtsiz; /* max text size */
103u_long dfldsiz; /* initial data size limit */
104u_long maxdsiz; /* max data size */
105u_long dflssiz; /* initial stack size limit */
106u_long maxssiz; /* max stack size */
107u_long sgrowsiz; /* amount to grow stack */
108
109SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0,
110 "Number of clock ticks per second");
111SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0,
112 "Number of pre-allocated timer events");
113SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0,
114 "Number of buffers in the buffer cache");
115SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0,
116 "Number of swap buffers");
117SYSCTL_INT(_kern, OID_AUTO, msgbufsize, CTLFLAG_RDTUN, &msgbufsize, 0,
118 "Size of the kernel message buffer");
119SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0,
120 "Maximum memory for swap metadata");
121SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0,
122 "Maximum value of vfs.maxbufspace");
123SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RW | CTLFLAG_TUN, &maxtsiz, 0,
124 "Maximum text size");
125SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RW | CTLFLAG_TUN, &dfldsiz, 0,
126 "Initial data size limit");
127SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RW | CTLFLAG_TUN, &maxdsiz, 0,
128 "Maximum data size");
129SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RW | CTLFLAG_TUN, &dflssiz, 0,
130 "Initial stack size limit");
131SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RW | CTLFLAG_TUN, &maxssiz, 0,
132 "Maximum stack size");
133SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RW | CTLFLAG_TUN, &sgrowsiz, 0,
134 "Amount to grow stack on a stack fault");
135SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING,
136 NULL, 0, sysctl_kern_vm_guest, "A",
137 "Virtual machine guest detected? (none|generic|xen)");
138
139/*
140 * These have to be allocated somewhere; allocating
141 * them here forces loader errors if this file is omitted
142 * (if they've been externed everywhere else; hah!).
143 */
144struct buf *swbuf;
145
146/*
147 * The elements of this array are ordered based upon the values of the
148 * corresponding enum VM_GUEST members.
149 */
150static const char *const vm_guest_sysctl_names[] = {
151 "none",
152 "generic",
153 "xen",
154 NULL
155};
156
157#ifndef XEN
158static const char *const vm_bnames[] = {
159 "QEMU", /* QEMU */
160 "Plex86", /* Plex86 */
161 "Bochs", /* Bochs */
162 "Xen", /* Xen */
163 "BHYVE", /* bhyve */
164 "Seabios", /* KVM */
165 NULL
166};
167
168static const char *const vm_pnames[] = {
169 "VMware Virtual Platform", /* VMWare VM */
170 "Virtual Machine", /* Microsoft VirtualPC */
171 "VirtualBox", /* Sun xVM VirtualBox */
172 "Parallels Virtual Platform", /* Parallels VM */
173 "KVM", /* KVM */
174 NULL
175};
176
177
178/*
179 * Detect known Virtual Machine hosts by inspecting the emulated BIOS.
180 */
181static enum VM_GUEST
182detect_virtual(void)
183{
184 char *sysenv;
185 int i;
186
187 sysenv = getenv("smbios.bios.vendor");
188 if (sysenv != NULL) {
189 for (i = 0; vm_bnames[i] != NULL; i++)
190 if (strcmp(sysenv, vm_bnames[i]) == 0) {
191 freeenv(sysenv);
192 return (VM_GUEST_VM);
193 }
194 freeenv(sysenv);
195 }
196 sysenv = getenv("smbios.system.product");
197 if (sysenv != NULL) {
198 for (i = 0; vm_pnames[i] != NULL; i++)
199 if (strcmp(sysenv, vm_pnames[i]) == 0) {
200 freeenv(sysenv);
201 return (VM_GUEST_VM);
202 }
203 freeenv(sysenv);
204 }
205 return (VM_GUEST_NO);
206}
207#endif
208
209/*
210 * Boot time overrides that are not scaled against main memory
211 */
212void
213init_param1(void)
214{
215#ifndef XEN
216 vm_guest = detect_virtual();
217#else
218 vm_guest = VM_GUEST_XEN;
219#endif
220 hz = -1;
221 TUNABLE_INT_FETCH("kern.hz", &hz);
222 if (hz == -1)
223 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;
224 tick = 1000000 / hz;
225
226#ifdef VM_SWZONE_SIZE_MAX
227 maxswzone = VM_SWZONE_SIZE_MAX;
228#endif
229 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
230#ifdef VM_BCACHE_SIZE_MAX
231 maxbcache = VM_BCACHE_SIZE_MAX;
232#endif
233 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);
234 msgbufsize = MSGBUF_SIZE;
235 TUNABLE_INT_FETCH("kern.msgbufsize", &msgbufsize);
236
237 maxtsiz = MAXTSIZ;
238 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
239 dfldsiz = DFLDSIZ;
240 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
241 maxdsiz = MAXDSIZ;
242 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
243 dflssiz = DFLSSIZ;
244 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
245 maxssiz = MAXSSIZ;
246 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
247 sgrowsiz = SGROWSIZ;
248 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
249
250 /*
251 * Let the administrator set {NGROUPS_MAX}, but disallow values
252 * less than NGROUPS_MAX which would violate POSIX.1-2008 or
253 * greater than INT_MAX-1 which would result in overflow.
254 */
255 ngroups_max = NGROUPS_MAX;
256 TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max);
257 if (ngroups_max < NGROUPS_MAX)
258 ngroups_max = NGROUPS_MAX;
259
260 /*
261 * Only allow to lower the maximal pid.
262 * Prevent setting up a non-bootable system if pid_max is too low.
263 */
264 TUNABLE_INT_FETCH("kern.pid_max", &pid_max);
265 if (pid_max > PID_MAX)
266 pid_max = PID_MAX;
267 else if (pid_max < 300)
268 pid_max = 300;
269}
270
271/*
272 * Boot time overrides that are scaled against main memory
273 */
274void
275init_param2(long physpages)
276{
96pid_t pid_max = PID_MAX;
97long maxswzone; /* max swmeta KVA storage */
98long maxbcache; /* max buffer cache KVA storage */
99long maxpipekva; /* Limit on pipe KVA */
100int vm_guest; /* Running as virtual machine guest? */
101u_long maxtsiz; /* max text size */
102u_long dfldsiz; /* initial data size limit */
103u_long maxdsiz; /* max data size */
104u_long dflssiz; /* initial stack size limit */
105u_long maxssiz; /* max stack size */
106u_long sgrowsiz; /* amount to grow stack */
107
108SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0,
109 "Number of clock ticks per second");
110SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0,
111 "Number of pre-allocated timer events");
112SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0,
113 "Number of buffers in the buffer cache");
114SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0,
115 "Number of swap buffers");
116SYSCTL_INT(_kern, OID_AUTO, msgbufsize, CTLFLAG_RDTUN, &msgbufsize, 0,
117 "Size of the kernel message buffer");
118SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0,
119 "Maximum memory for swap metadata");
120SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0,
121 "Maximum value of vfs.maxbufspace");
122SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RW | CTLFLAG_TUN, &maxtsiz, 0,
123 "Maximum text size");
124SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RW | CTLFLAG_TUN, &dfldsiz, 0,
125 "Initial data size limit");
126SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RW | CTLFLAG_TUN, &maxdsiz, 0,
127 "Maximum data size");
128SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RW | CTLFLAG_TUN, &dflssiz, 0,
129 "Initial stack size limit");
130SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RW | CTLFLAG_TUN, &maxssiz, 0,
131 "Maximum stack size");
132SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RW | CTLFLAG_TUN, &sgrowsiz, 0,
133 "Amount to grow stack on a stack fault");
134SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING,
135 NULL, 0, sysctl_kern_vm_guest, "A",
136 "Virtual machine guest detected? (none|generic|xen)");
137
138/*
139 * These have to be allocated somewhere; allocating
140 * them here forces loader errors if this file is omitted
141 * (if they've been externed everywhere else; hah!).
142 */
143struct buf *swbuf;
144
145/*
146 * The elements of this array are ordered based upon the values of the
147 * corresponding enum VM_GUEST members.
148 */
149static const char *const vm_guest_sysctl_names[] = {
150 "none",
151 "generic",
152 "xen",
153 NULL
154};
155
156#ifndef XEN
157static const char *const vm_bnames[] = {
158 "QEMU", /* QEMU */
159 "Plex86", /* Plex86 */
160 "Bochs", /* Bochs */
161 "Xen", /* Xen */
162 "BHYVE", /* bhyve */
163 "Seabios", /* KVM */
164 NULL
165};
166
167static const char *const vm_pnames[] = {
168 "VMware Virtual Platform", /* VMWare VM */
169 "Virtual Machine", /* Microsoft VirtualPC */
170 "VirtualBox", /* Sun xVM VirtualBox */
171 "Parallels Virtual Platform", /* Parallels VM */
172 "KVM", /* KVM */
173 NULL
174};
175
176
177/*
178 * Detect known Virtual Machine hosts by inspecting the emulated BIOS.
179 */
180static enum VM_GUEST
181detect_virtual(void)
182{
183 char *sysenv;
184 int i;
185
186 sysenv = getenv("smbios.bios.vendor");
187 if (sysenv != NULL) {
188 for (i = 0; vm_bnames[i] != NULL; i++)
189 if (strcmp(sysenv, vm_bnames[i]) == 0) {
190 freeenv(sysenv);
191 return (VM_GUEST_VM);
192 }
193 freeenv(sysenv);
194 }
195 sysenv = getenv("smbios.system.product");
196 if (sysenv != NULL) {
197 for (i = 0; vm_pnames[i] != NULL; i++)
198 if (strcmp(sysenv, vm_pnames[i]) == 0) {
199 freeenv(sysenv);
200 return (VM_GUEST_VM);
201 }
202 freeenv(sysenv);
203 }
204 return (VM_GUEST_NO);
205}
206#endif
207
208/*
209 * Boot time overrides that are not scaled against main memory
210 */
211void
212init_param1(void)
213{
214#ifndef XEN
215 vm_guest = detect_virtual();
216#else
217 vm_guest = VM_GUEST_XEN;
218#endif
219 hz = -1;
220 TUNABLE_INT_FETCH("kern.hz", &hz);
221 if (hz == -1)
222 hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;
223 tick = 1000000 / hz;
224
225#ifdef VM_SWZONE_SIZE_MAX
226 maxswzone = VM_SWZONE_SIZE_MAX;
227#endif
228 TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
229#ifdef VM_BCACHE_SIZE_MAX
230 maxbcache = VM_BCACHE_SIZE_MAX;
231#endif
232 TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);
233 msgbufsize = MSGBUF_SIZE;
234 TUNABLE_INT_FETCH("kern.msgbufsize", &msgbufsize);
235
236 maxtsiz = MAXTSIZ;
237 TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
238 dfldsiz = DFLDSIZ;
239 TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
240 maxdsiz = MAXDSIZ;
241 TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
242 dflssiz = DFLSSIZ;
243 TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
244 maxssiz = MAXSSIZ;
245 TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
246 sgrowsiz = SGROWSIZ;
247 TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
248
249 /*
250 * Let the administrator set {NGROUPS_MAX}, but disallow values
251 * less than NGROUPS_MAX which would violate POSIX.1-2008 or
252 * greater than INT_MAX-1 which would result in overflow.
253 */
254 ngroups_max = NGROUPS_MAX;
255 TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max);
256 if (ngroups_max < NGROUPS_MAX)
257 ngroups_max = NGROUPS_MAX;
258
259 /*
260 * Only allow to lower the maximal pid.
261 * Prevent setting up a non-bootable system if pid_max is too low.
262 */
263 TUNABLE_INT_FETCH("kern.pid_max", &pid_max);
264 if (pid_max > PID_MAX)
265 pid_max = PID_MAX;
266 else if (pid_max < 300)
267 pid_max = 300;
268}
269
270/*
271 * Boot time overrides that are scaled against main memory
272 */
273void
274init_param2(long physpages)
275{
277 quad_t realmem;
278
279 /* Base parameters */
280 maxusers = MAXUSERS;
281 TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
282 if (maxusers == 0) {
283 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
284 if (maxusers < 32)
285 maxusers = 32;
286#ifdef VM_MAX_AUTOTUNE_MAXUSERS
287 if (maxusers > VM_MAX_AUTOTUNE_MAXUSERS)
288 maxusers = VM_MAX_AUTOTUNE_MAXUSERS;
289#endif
290 /*
291 * Scales down the function in which maxusers grows once
292 * we hit 384.
293 */
294 if (maxusers > 384)
295 maxusers = 384 + ((maxusers - 384) / 8);
296 }
297
298 /*
299 * The following can be overridden after boot via sysctl. Note:
300 * unless overriden, these macros are ultimately based on maxusers.
301 * Limit maxproc so that kmap entries cannot be exhausted by
302 * processes.
303 */
304 maxproc = NPROC;
305 TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
306 if (maxproc > (physpages / 12))
307 maxproc = physpages / 12;
308 maxprocperuid = (maxproc * 9) / 10;
309
310 /*
311 * The default limit for maxfiles is 1/12 of the number of
312 * physical page but not less than 16 times maxusers.
313 * At most it can be 1/6 the number of physical pages.
314 */
315 maxfiles = imax(MAXFILES, physpages / 8);
316 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
317 if (maxfiles > (physpages / 4))
318 maxfiles = physpages / 4;
319 maxfilesperproc = (maxfiles / 10) * 9;
320
321 /*
322 * Cannot be changed after boot.
323 */
324 nbuf = NBUF;
325 TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
326
327 /*
328 * XXX: Does the callout wheel have to be so big?
329 *
330 * Clip callout to result of previous function of maxusers maximum
331 * 384. This is still huge, but acceptable.
332 */
333 ncallout = imin(16 + maxproc + maxfiles, 18508);
334 TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
335
336 /*
276
277 /* Base parameters */
278 maxusers = MAXUSERS;
279 TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
280 if (maxusers == 0) {
281 maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
282 if (maxusers < 32)
283 maxusers = 32;
284#ifdef VM_MAX_AUTOTUNE_MAXUSERS
285 if (maxusers > VM_MAX_AUTOTUNE_MAXUSERS)
286 maxusers = VM_MAX_AUTOTUNE_MAXUSERS;
287#endif
288 /*
289 * Scales down the function in which maxusers grows once
290 * we hit 384.
291 */
292 if (maxusers > 384)
293 maxusers = 384 + ((maxusers - 384) / 8);
294 }
295
296 /*
297 * The following can be overridden after boot via sysctl. Note:
298 * unless overriden, these macros are ultimately based on maxusers.
299 * Limit maxproc so that kmap entries cannot be exhausted by
300 * processes.
301 */
302 maxproc = NPROC;
303 TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
304 if (maxproc > (physpages / 12))
305 maxproc = physpages / 12;
306 maxprocperuid = (maxproc * 9) / 10;
307
308 /*
309 * The default limit for maxfiles is 1/12 of the number of
310 * physical page but not less than 16 times maxusers.
311 * At most it can be 1/6 the number of physical pages.
312 */
313 maxfiles = imax(MAXFILES, physpages / 8);
314 TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
315 if (maxfiles > (physpages / 4))
316 maxfiles = physpages / 4;
317 maxfilesperproc = (maxfiles / 10) * 9;
318
319 /*
320 * Cannot be changed after boot.
321 */
322 nbuf = NBUF;
323 TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
324
325 /*
326 * XXX: Does the callout wheel have to be so big?
327 *
328 * Clip callout to result of previous function of maxusers maximum
329 * 384. This is still huge, but acceptable.
330 */
331 ncallout = imin(16 + maxproc + maxfiles, 18508);
332 TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
333
334 /*
337 * The default limit for all mbuf related memory is 1/2 of all
338 * available kernel memory (physical or kmem).
339 * At most it can be 3/4 of available kernel memory.
340 */
341 realmem = qmin((quad_t)physpages * PAGE_SIZE,
342 VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS);
343 maxmbufmem = realmem / 2;
344 TUNABLE_QUAD_FETCH("kern.maxmbufmem", &maxmbufmem);
345 if (maxmbufmem > (realmem / 4) * 3)
346 maxmbufmem = (realmem / 4) * 3;
347
348 /*
349 * The default for maxpipekva is min(1/64 of the kernel address space,
350 * max(1/64 of main memory, 512KB)). See sys_pipe.c for more details.
351 */
352 maxpipekva = (physpages / 64) * PAGE_SIZE;
353 TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
354 if (maxpipekva < 512 * 1024)
355 maxpipekva = 512 * 1024;
356 if (maxpipekva > (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 64)
357 maxpipekva = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) /
358 64;
359}
360
361/*
362 * Sysctl stringiying handler for kern.vm_guest.
363 */
364static int
365sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS)
366{
367 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest],
368 strlen(vm_guest_sysctl_names[vm_guest])));
369}
335 * The default for maxpipekva is min(1/64 of the kernel address space,
336 * max(1/64 of main memory, 512KB)). See sys_pipe.c for more details.
337 */
338 maxpipekva = (physpages / 64) * PAGE_SIZE;
339 TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
340 if (maxpipekva < 512 * 1024)
341 maxpipekva = 512 * 1024;
342 if (maxpipekva > (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) / 64)
343 maxpipekva = (VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS) /
344 64;
345}
346
347/*
348 * Sysctl stringiying handler for kern.vm_guest.
349 */
350static int
351sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS)
352{
353 return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest],
354 strlen(vm_guest_sysctl_names[vm_guest])));
355}