param.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

#ifndef lint
static	char	*sccsid = "@(#)param.c	4.5	(ULTRIX)	2/28/91";
#endif lint

/************************************************************************
 *									*
 *			Copyright (c) 1988 by				*
 *		Digital Equipment Corporation, Maynard, MA		*
 *			All rights reserved.				*
 *									*
 *   This software is furnished under a license and may be used and	*
 *   copied  only  in accordance with the terms of such license and	*
 *   with the  inclusion  of  the  above  copyright  notice.   This	*
 *   software  or  any  other copies thereof may not be provided or	*
 *   otherwise made available to any other person.  No title to and	*
 *   ownership of the software is hereby transferred.			*
 *									*
 *   This software is  derived  from  software  received  from  the	*
 *   University    of   California,   Berkeley,   and   from   Bell	*
 *   Laboratories.  Use, duplication, or disclosure is  subject  to	*
 *   restrictions  under  license  agreements  with  University  of	*
 *   California and with AT&T.						*
 *									*
 *   The information in this software is subject to change  without	*
 *   notice  and should not be construed as a commitment by Digital	*
 *   Equipment Corporation.						*
 *									*
 *   Digital assumes no responsibility for the use  or  reliability	*
 *   of its software on equipment which is not supplied by Digital.	*
 *									*
 ************************************************************************/

/*-----------------------------------------------------------------------
 *
 * Modification History
 *
 * 28 Feb 91 prs
 *	Added max_nofile to support a configurable number
 *	of open file desciptors.
 *
 * 27 Dec 90 prs
 *	Added ufs_blkpref_lookbehind symbol.
 *
 *  12 Dec 89 burns
 *	moved sysptsize global here. Was in startup.c. Needs to be
 *	in a file that is built in the target directory, not binary.
 *
 *  11 Dec 89 jaa
 *	removed vasslop/VASSLOP, they're not used anymore
 *
 * 09-Nov-89	jaw
 *	add smp options to file.
 *
 * 20-sep-89	burns
 *	Merged in ISIS pool changes for DECsystem 58xx, 5400, 3MAX, etc.
 *	Included the following;
 * 	09 Jun 89 -- afd
 *	  Remove "define HZ".  The value of HZ is in cpuconf.h in the cpusw.
 *	  Don't initialize hz, tick, & tickadj here.  hz, tick, & tickadj
 *	  will be initialized in processor specific init routines.
 *
 * 16-AUG-1989     bp
 *      Conditionalized vasslop on SAS
 *
 * 12-Jun-89	bp
 *	Added kernel memory allocator high water mark tuning parameters.
 *
 * 12 Jun 89 -- gg
 *	added few dynamic swap configurable paramters(eg. maxdsiz, maxssiz
 *	vasslop, maxretry, swapfrag). Also removed the configurable parameters
 *	dmmin and dmmax.
 *
 * 15 Nov 88 -- jaa
 *	put vm_data.c back in here
 *
 * 10 Nov 88 -- chet
 *	V3.0 changes + configurable buffer cache.
 *
 *-----------------------------------------------------------------------
 */


#include "../h/param.h"
#include "../h/systm.h"
#include "../h/socket.h"
#include "../h/user.h"
#include "../h/proc.h"
#include "../h/text.h"
#include "../h/gnode.h"
#include "../h/file.h"
#include "../h/callout.h"
#include "../h/clist.h"
#include "../h/cmap.h"
#include "../h/mbuf.h"
#include "../h/kernel.h"
#include "../h/quota.h"
#include "../h/flock.h"
#include "../h/cpudata.h"
#include "../machine/pte.h"
#include "../machine/vmparam.h"
#include "../h/map.h"
#include "../h/ipc.h"
#include "../h/msg.h"
#include "../h/sem.h"
#include "../h/shm.h"
#include "../h/kmalloc.h"
#include "./assym.h"

int	sysptsize = SYSPTSIZE;


/*
 * 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 -DTIMEZONE=x -DDST=x -DMAXUSERS=xx
 */

int	hz;
int	tick;
int	tickadj;
struct	timezone tz = { TIMEZONE, DST };

/* must be multiple of 32 for bitmap */
#define	NPROC (((20 + 8 * MAXUSERS)+31)&(~0x1f))
int	nproc = NPROC;
int	max_proc_index = NPROC>>5;

#define NTEXT (44 + MAXUSERS)
int	ntext = NTEXT;
;
#define	NGNODE (NPROC + MAXUSERS + NTEXT + 48)
int	ngnode = NGNODE;

int	nchsize = NGNODE * 11 / 10;

struct flckinfo flckinfo = { 4 * (NGNODE / 10), NGNODE / 10 };

int	nfile = 16 * (NPROC + 16 + MAXUSERS) / 10 + 72;

int	ncallout = 16 + NPROC;

int	nclist = 75 + 16 * MIN(75,MAXUSERS);

int	nport = NPROC / 2;

int	nquota = (MAXUSERS * 9) / 7 + 3;
int	ndquot = NGNODE + (MAXUSERS * NMOUNT) / 4;

int maxusers = MAXUSERS;

/*
 * The bufcache value is the  % of memory to use for buffer cache data.
 * It is added to the makefile by config as a defined constant
 * on the compile line for this file in machine specific directories.
 * This constant is not defined for BINARY, so set it to a default value there.
 */
#ifndef BUFCACHE
#define BUFCACHE 10
#endif
int	bufcache = BUFCACHE;

/*
 * Control whether the buffer cache is in hardware cacheable data space.
 * By default, don't `cache' the buffer cache.
 */
int	cache_bufcache = 0;

int maxuprc = MAXUPRC;

/*
 * These are initialized at bootstrap time
 * to values dependent on memory size
 */
int	nbuf, nswbuf;

/*
 * These have to be allocated somewhere; allocating
 * them here forces loader errors if this file is omitted.
 */
struct	proc *proc, *procNPROC;
struct	text *text, *textNTEXT;
struct	gnode *gnode, *gnodeNGNODE;
struct	file *file, *fileNFILE;
struct filock  	*flox;
struct flino   	*flinotab;
struct 	callout *callout;
struct	cblock *cfree;
struct	buf *buf, *swbuf;
char	*buffers;
struct	cmap *cmap, *ecmap;
#ifdef QUOTA
struct	quota *quota, *quotaNQUOTA;
struct	dquot *dquot, *dquotNDQUOT;
#endif QUOTA

struct	nch *nch;

#define MAX_SECONDS_WAIT 40
int max_spin_count = 1000000;
int max_seconds_wait = 40;
int max_sleep_count = 2000;
#ifdef SMP
int smp =1;
#else
int smp=0;
#endif

#ifndef MAXTSEG
#define	MAXTSEG	32            /* for 12 meg text (old NXDAD) */
#endif	MAXTSEG

#ifndef MAXUSERS
#define MAXUSERS 8
#endif	MAXUSERS

long usrptsize = USRPTSIZE;

int	maxtsiz = btoc(MAXTSEG * 1024 * 1024);	/* in mem pages */

#ifndef	SAS
int notsas = 1;
#else
int notsas = 0;
#endif	!SAS

/*
 *  SWAPFRAG is in terms of disk blocks
 */

#ifndef SWAPFRAG
#define SWAPFRAG 64
#endif SWAPFRAG

#ifndef MAXRETRY
/* retry count to get kernel space (KM_ALLOC) */
#define MAXRETRY 10
#endif MAXRETRY

int  swapfrag = SWAPFRAG;
int  maxretry = MAXRETRY;

int  maxdsiz  = btoc(MAXDSIZ);
int  maxssiz  = btoc(MAXSSIZ);

/* The following data structs are required for System V IPC */
char ipcmsgbuf[ MSGSEG * MSGSSZ];
struct map	msgmap[MSGMAP];
struct msqid_ds	msgque[MSGMNI];
struct msg	msgh[MSGTQL];
struct msginfo	msginfo = {
	MSGMAP,
	MSGMAX,
	MSGMNB,
	MSGMNI,
	MSGSSZ,
	MSGTQL,
	0,
	MSGSEG
};

struct	semid_ds	sema[SEMMNI];
struct	sem		sem[SEMMNS];
struct	map		semmap[SEMMAP];
struct	sem_undo	*sem_undo[NPROC];

#define	SEMUSZ	(sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME)
int	semu[((SEMUSZ*SEMMNU)+NBPW-1)/NBPW];

union semtmp {
	short		semvals[SEMMSL];
	struct semid_ds	ds;
	struct sembuf	semops[SEMOPM];
};

int	semtmp_size = sizeof(union semtmp);

struct	seminfo seminfo = {
	SEMMAP,
	SEMMNI,
	SEMMNS,
	SEMMNU,
	SEMMSL,
	SEMOPM,
	SEMUME,
	SEMUSZ,
	SEMVMX,
	SEMAEM
};

struct smem	smem[SMMNI];	

#ifdef MAXSMAT
#undef MAXSMAT
#endif MAXSMAT
#define MAXSMAT	0

struct	sminfo sminfo = {
	clrnd(SMMAX) * NBPG,
	(SMMIN * NBPG) & ~(CLBYTES - 1),
	SMMNI,
	SMSEG,
	clrnd(SMBRK),
	MAXSMAT,
};

/*
 * Size of wired allocator map.
 */

int km_wmapsize = KMEMWMAP;

/*
 * The following declarations are required for the tuneable
 * parameters of the kernel memory allocator for the high water marks.
 */

short kmbucket_hwm = -1;			/* Default value */
short kmemhwm[MAXBUCKETSAVE+1] = {
0,0,0,0,		/* Unused buckets */
-1,			/* Bucket with    16 byte elements  	*/
-1,			/* Bucket with    32 byte elements  	*/
-1,			/* Bucket with    64 byte elements	*/
KMBUCKET_HWM*4,		/* Bucket with   128 byte elements	*/
-1,			/* Bucket with   256 byte elements	*/
-1,			/* Bucket with   512 byte elements	*/
-1,			/* Bucket with  1024 byte elements	*/
-1,			/* Bucket with  2048 byte elements	*/
-1,			/* Bucket with 	4096 byte elements	*/
-1,			/* Bucket with 	8192 byte elements	*/
-1,			/* Bucket with 16384 byte elements	*/
-1,			/* Bucket with 32768 byte elements	*/
};

int     delay_wbuffers = 0;

int	ufs_blkpref_lookbehind = 8;

/*
 * The maximum number of file descriptors is now a configurable option
 * (max_nofile variable in /sys/conf/{mips|vax}/param.c).
 * The getdtablesize(2) system call should be used to obtain the
 * current limit. The value returned by getdtablesize() must be greater
 * than 64, and less than or equal to MAX_NOFILE in types.h . The
 * MAX_NOFILE define is needed for backward compatability with broken
 * programs that need a static sized array for selecting. These programs
 * should be modified to use the getdtablesize() interface for sizing.
 */

int	max_nofile = 64;

/*
 * The following three parameters control the effect that signal
 * activity has on process priority. In the default case shown
 * here, the sigpause system call and signal delivery via psignal
 * do effect process priority. This is historically compatible
 * with BSD versions of unix. Here are the defaults:
 *
 *	int sigpause_priority_mod = 0;
 *	int sigpause_priority_limit = PZERO + 1;
 *	int psignal_priority_mod = 1;
 *
 * These setting can be changed if it is perceived that the priority
 * adjustments are having detrimental effects on the system. Caution
 * is advised.
 *
 * The sigpause system call causes a process to sleep at priority
 * PSLEP. Setting the 'sigpause_priority_mod' to a non-zero value
 * causes the process to sleep at it's current priority, but no
 * lower than the value set in 'sigpause_priority_limit' (lower
 * numbered priorities have the highest priority). A processes
 * current priority should almost always be poorer that PSELP.
 *   Note: The sigpause_priority_limit should never be set lower
 *	than PZERO+1. Sleeping at a priority of PZERO or lower
 *	causes the process to be unable to be awakened by a signal.
 *	Since the design of the sigpause system call is to wait
 *	for a signal, allowing a process to sleep at PZERO or
 *	below will cause the process to sleep forever.
 * The psignal_priority_mod, when set to zero, causes the signal
 * delivery code to eliminate the normal setting of the process's
 * priority to PUSER, thus leaving the priority at it's current value.
 */
int sigpause_priority_mod = 0;
int sigpause_priority_limit = PZERO + 1;
int psignal_priority_mod = 1;