summaryrefslogtreecommitdiffstats
path: root/sys/kern/subr_param.c
blob: a8c583cbc96959b309b02abc570e037b796659ed (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
/*-
 * 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
#endif
#define	NPROC (20 + 16 * maxusers)
#ifndef NBUF
#define NBUF 0
#endif
#ifndef MAXFILES
#define	MAXFILES (maxproc * 2)
#endif

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;
int	maxswzone;			/* max swmeta KVA storage */
int	maxbcache;			/* max buffer cache KVA storage */
int	maxpipekva;			/* Limit on pipe KVA */
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, maxswzone, CTLFLAG_RD, &maxswzone, 0, "");
SYSCTL_INT(_kern, OID_AUTO, maxbcache, CTLFLAG_RD, &maxbcache, 0, "");
SYSCTL_ULONG(_kern, OID_AUTO, maxtsiz, CTLFLAG_RD, &maxtsiz, 0, "");
SYSCTL_ULONG(_kern, OID_AUTO, dfldsiz, CTLFLAG_RD, &dfldsiz, 0, "");
SYSCTL_ULONG(_kern, OID_AUTO, maxdsiz, CTLFLAG_RD, &maxdsiz, 0, "");
SYSCTL_ULONG(_kern, OID_AUTO, dflssiz, CTLFLAG_RD, &dflssiz, 0, "");
SYSCTL_ULONG(_kern, OID_AUTO, maxssiz, CTLFLAG_RD, &maxssiz, 0, "");
SYSCTL_ULONG(_kern, OID_AUTO, sgrowsiz, CTLFLAG_RD, &sgrowsiz, 0, "");

/*
 * 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;

/*
 * Boot time overrides that are not scaled against main memory
 */
void
init_param1(void)
{

	hz = HZ;
	TUNABLE_INT_FETCH("kern.hz", &hz);
	tick = 1000000 / hz;

#ifdef VM_SWZONE_SIZE_MAX
	maxswzone = VM_SWZONE_SIZE_MAX;
#endif
	TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone);
#ifdef VM_BCACHE_SIZE_MAX
	maxbcache = VM_BCACHE_SIZE_MAX;
#endif
	TUNABLE_INT_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 kernel map
 */
void
init_param3(long kmempages)
{

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