summaryrefslogtreecommitdiffstats
path: root/sys/kern/subr_param.c
blob: c56ab86325f64d20a0ca6217dfa215e3551df396 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
/*-
 * Copyright (c) 1980, 1986, 1989, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)param.c	8.3 (Berkeley) 8/20/94
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_param.h"
#include "opt_maxusers.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>

#include <vm/vm_param.h>

/*
 * System parameter formulae.
 */

#ifndef HZ
#  if defined(__amd64__) || defined(__i386__) || defined(__ia64__) || defined(__sparc64__)
#    define	HZ 1000
#  else
#    define	HZ 100
#  endif
#  ifndef HZ_VM
#    define	HZ_VM 10
#  endif
#else
#  ifndef HZ_VM
#    define	HZ_VM HZ
#  endif
#endif
#define	NPROC (20 + 16 * maxusers)
#ifndef NBUF
#define NBUF 0
#endif
#ifndef MAXFILES
#define	MAXFILES (maxproc * 2)
#endif

/* Values of enum VM_GUEST members are used as indices in 
 * vm_guest_sysctl_names */
enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN };

static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS);

int	hz;
int	tick;
int	maxusers;			/* base tunable */
int	maxproc;			/* maximum # of processes */
int	maxprocperuid;			/* max # of procs per user */
int	maxfiles;			/* sys. wide open files limit */
int	maxfilesperproc;		/* per-proc open files limit */
int	ncallout;			/* maximum # of timer events */
int	nbuf;
int	nswbuf;
long	maxswzone;			/* max swmeta KVA storage */
long	maxbcache;			/* max buffer cache KVA storage */
long	maxpipekva;			/* Limit on pipe KVA */
int 	vm_guest;			/* Running as virtual machine guest? */
u_long	maxtsiz;			/* max text size */
u_long	dfldsiz;			/* initial data size limit */
u_long	maxdsiz;			/* max data size */
u_long	dflssiz;			/* initial stack size limit */
u_long	maxssiz;			/* max stack size */
u_long	sgrowsiz;			/* amount to grow stack */

SYSCTL_INT(_kern, OID_AUTO, hz, CTLFLAG_RDTUN, &hz, 0, "ticks/second");
SYSCTL_INT(_kern, OID_AUTO, ncallout, CTLFLAG_RDTUN, &ncallout, 0,
    "Number of pre-allocated timer events");
SYSCTL_INT(_kern, OID_AUTO, nbuf, CTLFLAG_RDTUN, &nbuf, 0,
    "Number of buffer-cache I/O buffers");
SYSCTL_INT(_kern, OID_AUTO, nswbuf, CTLFLAG_RDTUN, &nswbuf, 0,
    "Number of swap buffers");
SYSCTL_LONG(_kern, OID_AUTO, maxswzone, CTLFLAG_RDTUN, &maxswzone, 0,
    "max swmeta KVA storage");
SYSCTL_LONG(_kern, OID_AUTO, maxbcache, CTLFLAG_RDTUN, &maxbcache, 0,
    "max buffer cache KVA storage");
SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RDTUN, &maxtsiz, 0,
    "max text size");
SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RDTUN, &dfldsiz, 0,
    "initial data size limit");
SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RDTUN, &maxdsiz, 0,
    "max data size");
SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RDTUN, &dflssiz, 0,
    "initial stack size limit");
SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RDTUN, &maxssiz, 0,
    "max stack size");
SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RDTUN, &sgrowsiz, 0,
    "amount to grow stack");
SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING,
    NULL, 0, sysctl_kern_vm_guest, "A",
    "Virtual machine detected? (none|generic|xen)");

/*
 * These have to be allocated somewhere; allocating
 * them here forces loader errors if this file is omitted
 * (if they've been externed everywhere else; hah!).
 */
struct	buf *swbuf;

static const char *const vm_guest_sysctl_names[] = {
	"none",
	"generic",
	"xen",
	NULL
};

#ifndef XEN
static const char *const vm_bnames[] = {
	"QEMU",				/* QEMU */
	"Plex86",			/* Plex86 */
	"Bochs",			/* Bochs */
	NULL
};

static const char *const vm_pnames[] = {
	"VMware Virtual Platform",	/* VMWare VM */
	"Virtual Machine",		/* Microsoft VirtualPC */
	"VirtualBox",			/* Sun xVM VirtualBox */
	"Parallels Virtual Platform",	/* Parallels VM */
	NULL
};


/*
 * Detect known Virtual Machine hosts by inspecting the emulated BIOS.
 */
static enum VM_GUEST
detect_virtual(void)
{
	char *sysenv;
	int i;

	sysenv = getenv("smbios.bios.vendor");
	if (sysenv != NULL) {
		for (i = 0; vm_bnames[i] != NULL; i++)
			if (strcmp(sysenv, vm_bnames[i]) == 0) {
				freeenv(sysenv);
				return (VM_GUEST_VM);
			}
		freeenv(sysenv);
	}
	sysenv = getenv("smbios.system.product");
	if (sysenv != NULL) {
		for (i = 0; vm_pnames[i] != NULL; i++)
			if (strcmp(sysenv, vm_pnames[i]) == 0) {
				freeenv(sysenv);
				return (VM_GUEST_VM);
			}
		freeenv(sysenv);
	}
	return (VM_GUEST_NO);
}
#endif

/*
 * Boot time overrides that are not scaled against main memory
 */
void
init_param1(void)
{
#ifndef XEN
	vm_guest = detect_virtual();
#else
	vm_guest = VM_GUEST_XEN;
#endif
	hz = -1;
	TUNABLE_INT_FETCH("kern.hz", &hz);
	if (hz == -1)
		hz = vm_guest > VM_GUEST_NO ? HZ_VM : HZ;
	tick = 1000000 / hz;

#ifdef VM_SWZONE_SIZE_MAX
	maxswzone = VM_SWZONE_SIZE_MAX;
#endif
	TUNABLE_LONG_FETCH("kern.maxswzone", &maxswzone);
#ifdef VM_BCACHE_SIZE_MAX
	maxbcache = VM_BCACHE_SIZE_MAX;
#endif
	TUNABLE_LONG_FETCH("kern.maxbcache", &maxbcache);

	maxtsiz = MAXTSIZ;
	TUNABLE_ULONG_FETCH("kern.maxtsiz", &maxtsiz);
	dfldsiz = DFLDSIZ;
	TUNABLE_ULONG_FETCH("kern.dfldsiz", &dfldsiz);
	maxdsiz = MAXDSIZ;
	TUNABLE_ULONG_FETCH("kern.maxdsiz", &maxdsiz);
	dflssiz = DFLSSIZ;
	TUNABLE_ULONG_FETCH("kern.dflssiz", &dflssiz);
	maxssiz = MAXSSIZ;
	TUNABLE_ULONG_FETCH("kern.maxssiz", &maxssiz);
	sgrowsiz = SGROWSIZ;
	TUNABLE_ULONG_FETCH("kern.sgrowsiz", &sgrowsiz);
}

/*
 * Boot time overrides that are scaled against main memory
 */
void
init_param2(long physpages)
{

	/* Base parameters */
	maxusers = MAXUSERS;
	TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
	if (maxusers == 0) {
		maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
		if (maxusers < 32)
			maxusers = 32;
		if (maxusers > 384)
			maxusers = 384;
	}

	/*
	 * The following can be overridden after boot via sysctl.  Note:
	 * unless overriden, these macros are ultimately based on maxusers.
	 */
	maxproc = NPROC;
	TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
	/*
	 * Limit maxproc so that kmap entries cannot be exhausted by
	 * processes.
	 */
	if (maxproc > (physpages / 12))
		maxproc = physpages / 12;
	maxfiles = MAXFILES;
	TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
	maxprocperuid = (maxproc * 9) / 10;
	maxfilesperproc = (maxfiles * 9) / 10;
	
	/*
	 * Cannot be changed after boot.
	 */
	nbuf = NBUF;
	TUNABLE_INT_FETCH("kern.nbuf", &nbuf);

	ncallout = 16 + maxproc + maxfiles;
	TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
}

/*
 * Boot time overrides that are scaled against the kmem map
 */
void
init_param3(long kmempages)
{

	/*
	 * The default for maxpipekva is max(5% of the kmem map, 512KB).
	 * See sys_pipe.c for more details.
	 */
	maxpipekva = (kmempages / 20) * PAGE_SIZE;
	if (maxpipekva < 512 * 1024)
		maxpipekva = 512 * 1024;
	TUNABLE_LONG_FETCH("kern.ipc.maxpipekva", &maxpipekva);
}

/*
 * Sysctl stringiying handler for kern.vm_guest.
 */
static int
sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS)
{
	return (SYSCTL_OUT(req, vm_guest_sysctl_names[vm_guest], 
	    strlen(vm_guest_sysctl_names[vm_guest])));
}
OpenPOWER on IntegriCloud