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File: [cvs.NetBSD.org] / src / sys / conf / param.c (download)

Revision 1.64, Sat Jun 9 02:31:14 2012 UTC (8 years, 8 months ago) by christos
Branch: MAIN
CVS Tags: yamt-pagecache-base9, yamt-pagecache-base8, yamt-pagecache-base7, yamt-pagecache-base6, tls-maxphys-base, tls-earlyentropy-base, tls-earlyentropy, rmind-smpnet-nbase, rmind-smpnet-base, rmind-smpnet, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, nick-nhusb-base-20150406, nick-nhusb-base, netbsd-7-nhusb-base-20170116, netbsd-7-nhusb-base, netbsd-7-nhusb, netbsd-7-base, netbsd-7-2-RELEASE, netbsd-7-1-RELEASE, netbsd-7-1-RC2, netbsd-7-1-RC1, netbsd-7-1-2-RELEASE, netbsd-7-1-1-RELEASE, netbsd-7-1, netbsd-7-0-RELEASE, netbsd-7-0-RC3, netbsd-7-0-RC2, netbsd-7-0-RC1, netbsd-7-0-2-RELEASE, netbsd-7-0-1-RELEASE, netbsd-7-0, netbsd-7, khorben-n900, agc-symver-base, agc-symver
Branch point for: tls-maxphys, nick-nhusb
Changes since 1.63: +4 -2 lines

Add a new resource to limit the number of lwps per user, RLIMIT_NTHR. There
is a global sysctl kern.maxlwp to control this, which is by default 2048.
The first lwp of each process or kernel threads are not counted against the
limit. To show the current resource usage per user, I added a new sysctl
that dumps the uidinfo structure fields.

/*	$NetBSD: param.c,v 1.64 2012/06/09 02:31:14 christos Exp $	*/

/*
 * Copyright (c) 1980, 1986, 1989 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.
 * 3. 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	7.20 (Berkeley) 6/27/91
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: param.c,v 1.64 2012/06/09 02:31:14 christos Exp $");

#include "opt_hz.h"
#include "opt_rtc_offset.h"
#include "opt_sysv.h"
#include "opt_sysvparam.h"
#include "opt_multiprocessor.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/callout.h>
#include <sys/mbuf.h>
#include <ufs/ufs/quota.h>
#include <sys/kernel.h>
#include <sys/utsname.h>
#include <sys/ksem.h>
#include <sys/lwp.h>
#ifdef SYSVSHM
#include <machine/vmparam.h>
#include <sys/shm.h>
#endif
#ifdef SYSVSEM
#include <sys/sem.h>
#endif
#ifdef SYSVMSG
#include <sys/msg.h>
#endif

/*
 * PCC cannot handle the 80KB string literal.
 */
#if !defined(__PCC__)
#define CONFIG_FILE
#include "config_file.h"
#endif

/*
 * System parameter formulae.
 *
 * This file is copied into each directory where we compile
 * the kernel; it should be modified there to suit local taste
 * if necessary.
 *
 * Compiled with -DHZ=xx -DRTC_OFFSET=x -DMAXUSERS=xx
 */

#ifdef TIMEZONE
#error TIMEZONE is an obsolete kernel option.
#endif

#ifdef DST
#error DST is an obsolete kernel option.
#endif

#ifndef RTC_OFFSET
#define RTC_OFFSET 0
#endif

#ifndef HZ
#define	HZ 100
#endif

#ifndef MAXFILES
#define	MAXFILES	(3 * (NPROC + MAXUSERS) + 80)
#endif

#ifndef MAXEXEC
#define	MAXEXEC		16
#endif

int	hz = HZ;
int	tick = 1000000 / HZ;
/* can adjust 240ms in 60s */
int	tickadj = (240000 / (60 * HZ)) ? (240000 / (60 * HZ)) : 1;
int	rtc_offset = RTC_OFFSET;
int	maxproc = NPROC;
int	maxlwp = MAXLWP;
int	desiredvnodes = NVNODE;
u_int	maxfiles = MAXFILES;
int	fscale = FSCALE;	/* kernel uses `FSCALE', user uses `fscale' */
int	maxexec = MAXEXEC;	/* max number of concurrent exec() calls */

#ifdef MULTIPROCESSOR
u_int	maxcpus = MAXCPUS;
size_t	coherency_unit = COHERENCY_UNIT;
#else
u_int	maxcpus = 1;
size_t	coherency_unit = ALIGNBYTES + 1;
#endif

/*
 * Various mbuf-related parameters.  These can also be changed at run-time
 * with sysctl.
 */
int	nmbclusters = 0;

#ifndef MBLOWAT
#define	MBLOWAT		16
#endif
int	mblowat = MBLOWAT;

#ifndef MCLLOWAT
#define	MCLLOWAT	8
#endif
int	mcllowat = MCLLOWAT;

/*
 * Values in support of System V compatible shared memory.	XXX
 */
#ifdef SYSVSHM
#if !defined(SHMMAX) && defined(SHMMAXPGS)
#define	SHMMAX	SHMMAXPGS	/* shminit() performs a `*= PAGE_SIZE' */
#elif !defined(SHMMAX)
#define SHMMAX 0
#endif
#ifndef	SHMMIN
#define	SHMMIN	1
#endif
#ifndef	SHMMNI
#define	SHMMNI	128		/* <64k, see IPCID_TO_IX in ipc.h */
#endif
#ifndef	SHMSEG
#define	SHMSEG	128
#endif

struct	shminfo shminfo = {
	SHMMAX,
	SHMMIN,
	SHMMNI,
	SHMSEG,
	0
};
#endif

/*
 * Values in support of System V compatible semaphores.
 */
#ifdef SYSVSEM
struct	seminfo seminfo = {
	SEMMAP,		/* # of entries in semaphore map */
	SEMMNI,		/* # of semaphore identifiers */
	SEMMNS,		/* # of semaphores in system */
	SEMMNU,		/* # of undo structures in system */
	SEMMSL,		/* max # of semaphores per id */
	SEMOPM,		/* max # of operations per semop call */
	SEMUME,		/* max # of undo entries per process */
	SEMUSZ,		/* size in bytes of undo structure */
	SEMVMX,		/* semaphore maximum value */
	SEMAEM		/* adjust on exit max value */
};
#endif

/*
 * Values in support of System V compatible messages.
 */
#ifdef SYSVMSG
struct	msginfo msginfo = {
	MSGMAX,		/* max chars in a message */
	MSGMNI,		/* # of message queue identifiers */
	MSGMNB,		/* max chars in a queue */
	MSGTQL,		/* max messages in system */
	MSGSSZ,		/* size of a message segment */
			/* (must be small power of 2 greater than 4) */
	MSGSEG		/* number of message segments */
};
#endif

/*
 * Actual network mbuf sizes (read-only), for netstat.
 */
const	int msize = MSIZE;
const	int mclbytes = MCLBYTES;

/*
 * Values in support of POSIX semaphores.
 */
int	ksem_max = KSEM_MAX;