NetBSD/sys/kern/kern_allocsys.c

224 lines
7.2 KiB
C

/* $NetBSD: kern_allocsys.c,v 1.19 2002/08/21 02:48:54 itojun Exp $ */
/*-
* Copyright (c) 1999 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*-
* Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 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.
*
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_allocsys.c,v 1.19 2002/08/21 02:48:54 itojun Exp $");
#include "opt_bufcache.h"
#include "opt_callout.h"
#include "opt_sysv.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/callout.h>
#ifdef SYSVMSG
#include <sys/msg.h>
#endif
#ifdef SYSVSEM
#include <sys/sem.h>
#endif
#ifdef SYSVSHM
#include <sys/shm.h>
#endif
#include <uvm/uvm_extern.h>
/*
* Declare these as initialized data so we can patch them.
*/
#ifndef NBUF
# define NBUF 0
#endif
#ifndef BUFPAGES
# define BUFPAGES 0
#endif
#ifdef BUFCACHE
# if (BUFCACHE < 5) || (BUFCACHE > 95)
# error BUFCACHE is not between 5 and 95
# endif
#else
/* Default to 10% of first 2MB and 5% of remaining. */
# define BUFCACHE 0
#endif
int nbuf = NBUF;
int nswbuf = 0;
int bufpages = BUFPAGES; /* optional hardwired count */
int bufcache = BUFCACHE; /* % of RAM to use for buffer cache */
/*
* Allocate space for system data structures. We are given
* a starting virtual address and we return a final virtual
* address; along the way we set each data structure pointer.
*
* We call allocsys() with 0 to find out how much space we want,
* allocate that much and fill it with zeroes, and then call
* allocsys() again with the correct base virtual address.
*
*/
caddr_t
allocsys(caddr_t v, caddr_t (*mdcallback)(caddr_t))
{
/* Calculate the number of callwheels if necessary. */
if (callwheelsize == 0)
callout_setsize();
ALLOCSYS(v, callwheel, struct callout_queue, callwheelsize);
#ifdef CALLWHEEL_STATS
ALLOCSYS(v, callwheel_sizes, int, callwheelsize);
#endif
#ifdef SYSVSHM
ALLOCSYS(v, shmsegs, struct shmid_ds, shminfo.shmmni);
#endif
#ifdef SYSVSEM
ALLOCSYS(v, sema, struct semid_ds, seminfo.semmni);
ALLOCSYS(v, sem, struct __sem, seminfo.semmns);
/* This is pretty disgusting! */
ALLOCSYS(v, semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int));
#endif
#ifdef SYSVMSG
ALLOCSYS(v, msgpool, char, msginfo.msgmax);
ALLOCSYS(v, msgmaps, struct msgmap, msginfo.msgseg);
ALLOCSYS(v, msghdrs, struct __msg, msginfo.msgtql);
ALLOCSYS(v, msqids, struct msqid_ds, msginfo.msgmni);
#endif
/*
* Determine how many buffers to allocate.
*
* - If bufcache is specified, use that % of memory
* for the buffer cache.
*
* - Otherwise, we default to the traditional BSD
* formula of 10% of the first 2MB and 5% of
* the remaining.
*/
if (bufpages == 0) {
if (bufcache != 0) {
if (bufcache < 5 || bufcache > 95)
panic("bufcache is out of range (%d)\n",
bufcache);
bufpages = physmem / 100 * bufcache;
} else {
if (physmem < btoc(2 * 1024 * 1024))
bufpages = physmem / 10;
else
bufpages = (btoc(2 * 1024 * 1024) + physmem) /
20;
}
}
#ifdef DIAGNOSTIC
if (bufpages == 0)
panic("bufpages = 0\n");
#endif
/*
* Call the mdcallback now; it may need to adjust bufpages.
*/
if (mdcallback != NULL)
v = mdcallback(v);
/*
* Ensure a minimum of 16 buffers.
*/
if (nbuf == 0) {
nbuf = bufpages;
if (nbuf < 16)
nbuf = 16;
}
#ifdef VM_MAX_KERNEL_BUF
/*
* XXX stopgap measure to prevent wasting too much KVM on
* the sparsely filled buffer cache.
*/
if (nbuf > VM_MAX_KERNEL_BUF / MAXBSIZE)
nbuf = VM_MAX_KERNEL_BUF / MAXBSIZE;
#endif
/*
* We allocate 1/2 as many swap buffer headers as file I/O buffers.
*/
if (nswbuf == 0) {
nswbuf = (nbuf / 2) &~ 1; /* force even */
if (nswbuf > 256)
nswbuf = 256; /* sanity */
}
ALLOCSYS(v, buf, struct buf, nbuf);
return (v);
}