0f8b4e4579
BUFCACHE option is defined. With the new formular a few pages less will be used (22 on a system with 256MB) but we avoid a possible integer overflow.
220 lines
6.9 KiB
C
220 lines
6.9 KiB
C
/* $NetBSD: kern_allocsys.c,v 1.8 1999/12/05 17:12:43 tron Exp $ */
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/*-
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* Copyright (c) 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include "opt_bufcache.h"
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#include "opt_sysv.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/callout.h>
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#ifdef SYSVMSG
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#include <sys/msg.h>
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#endif
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#ifdef SYSVSEM
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#include <sys/sem.h>
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#endif
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#ifdef SYSVSHM
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#include <sys/shm.h>
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#endif
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#include <vm/vm.h>
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#include <vm/vm_page.h>
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/*
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* Declare these as initialized data so we can patch them.
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*/
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#ifndef NBUF
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# define NBUF 0
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#endif
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#ifndef BUFPAGES
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# define BUFPAGES 0
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#endif
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#ifdef BUFCACHE
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# if (BUFCACHE < 5) || (BUFCACHE > 95)
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# error BUFCACHE is not between 5 and 95
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# endif
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#else
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/* Default to 10% of first 2MB and 5% of remaining. */
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# define BUFCACHE 0
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#endif
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int nbuf = NBUF;
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int nswbuf = 0;
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int bufpages = BUFPAGES; /* optional hardwired count */
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int bufcache = BUFCACHE; /* % of RAM to use for buffer cache */
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/*
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* Allocate space for system data structures. We are given
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* a starting virtual address and we return a final virtual
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* address; along the way we set each data structure pointer.
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*
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* We call allocsys() with 0 to find out how much space we want,
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* allocate that much and fill it with zeroes, and then call
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* allocsys() again with the correct base virtual address.
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*
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*/
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caddr_t
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allocsys(v, mdcallback)
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caddr_t v;
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caddr_t (*mdcallback) __P((caddr_t));
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{
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ALLOCSYS(v, callout, struct callout, ncallout);
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#ifdef SYSVSHM
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ALLOCSYS(v, shmsegs, struct shmid_ds, shminfo.shmmni);
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#endif
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#ifdef SYSVSEM
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ALLOCSYS(v, sema, struct semid_ds, seminfo.semmni);
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ALLOCSYS(v, sem, struct __sem, seminfo.semmns);
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/* This is pretty disgusting! */
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ALLOCSYS(v, semu, int, (seminfo.semmnu * seminfo.semusz) / sizeof(int));
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#endif
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#ifdef SYSVMSG
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ALLOCSYS(v, msgpool, char, msginfo.msgmax);
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ALLOCSYS(v, msgmaps, struct msgmap, msginfo.msgseg);
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ALLOCSYS(v, msghdrs, struct __msg, msginfo.msgtql);
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ALLOCSYS(v, msqids, struct msqid_ds, msginfo.msgmni);
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#endif
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/*
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* Determine how many buffers to allocate.
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*
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* - If bufcache is specified, use that % of memory
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* for the buffer cache.
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*
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* - Otherwise, we default to the traditional BSD
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* formula of 10% of the first 2MB and 5% of
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* the remaining.
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*/
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if (bufpages == 0) {
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if (bufcache != 0) {
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if (bufcache < 5 || bufcache > 95)
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panic("bufcache is out of range (%d)\n",
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bufcache);
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bufpages = physmem / 100 * bufcache;
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} else {
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if (physmem < btoc(2 * 1024 * 1024))
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bufpages = physmem / 10;
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else
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bufpages = (btoc(2 * 1024 * 1024) + physmem) /
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20;
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}
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}
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#ifdef DIAGNOSTIC
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if (bufpages == 0)
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panic("bufpages = 0\n");
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#endif
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/*
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* Call the mdcallback now; it may need to adjust bufpages.
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*/
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if (mdcallback != NULL)
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v = mdcallback(v);
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/*
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* Ensure a minimum of 16 buffers.
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*/
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if (nbuf == 0) {
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nbuf = bufpages;
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if (nbuf < 16)
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nbuf = 16;
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}
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#ifdef VM_MAX_KERNEL_BUF
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/*
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* XXX stopgap measure to prevent wasting too much KVM on
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* the sparsely filled buffer cache.
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*/
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if (nbuf * MAXBSIZE > VM_MAX_KERNEL_BUF)
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nbuf = VM_MAX_KERNEL_BUF / MAXBSIZE;
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#endif
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/*
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* We allocate 1/2 as many swap buffer headers as file I/O buffers.
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*/
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if (nswbuf == 0) {
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nswbuf = (nbuf / 2) &~ 1; /* force even */
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if (nswbuf > 256)
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nswbuf = 256; /* sanity */
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}
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ALLOCSYS(v, buf, struct buf, nbuf);
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return (v);
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}
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