371 lines
8.8 KiB
C
371 lines
8.8 KiB
C
/* $NetBSD: bufcache.c,v 1.5 1999/12/20 23:11:50 jwise 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 Simon Burge.
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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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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: bufcache.c,v 1.5 1999/12/20 23:11:50 jwise Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/buf.h>
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#include <sys/mount.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <sys/vnode.h>
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#include <err.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <paths.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "systat.h"
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#include "extern.h"
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/*
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* Definitions for the buffer free lists (from sys/kern/vfs_bio.c).
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*/
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#define BQUEUES 4 /* number of free buffer queues */
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#define BQ_LOCKED 0 /* super-blocks &c */
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#define BQ_LRU 1 /* lru, useful buffers */
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#define BQ_AGE 2 /* rubbish */
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#define BQ_EMPTY 3 /* buffer headers with no memory */
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#define VCACHE_SIZE 50
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struct vcache {
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int vc_age;
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struct vnode *vc_addr;
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struct vnode vc_node;
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};
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struct ml_entry {
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int ml_count;
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long ml_size;
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long ml_valid;
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struct mount *ml_addr;
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struct mount ml_mount;
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LIST_ENTRY(ml_entry) ml_entries;
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};
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static struct nlist namelist[] = {
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#define X_NBUF 0
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{ "_nbuf" },
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#define X_BUF 1
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{ "_buf" },
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#define X_BUFQUEUES 2
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{ "_bufqueues" },
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#define X_BUFPAGES 3
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{ "_bufpages" },
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{ "" },
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};
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static struct vcache vcache[VCACHE_SIZE];
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static LIST_HEAD(mount_list, ml_entry) mount_list;
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static int nbuf, bufpages, bufbytes;
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static void *bufaddr;
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static struct buf *buf = NULL;
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static TAILQ_HEAD(bqueues, buf) bufqueues[BQUEUES];
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static void vc_init __P((void));
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static void ml_init __P((void));
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static struct vnode *vc_lookup __P((struct vnode *));
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static struct mount *ml_lookup __P((struct mount *, int, int));
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WINDOW *
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openbufcache()
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{
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return (subwin(stdscr, LINES-5-1, 0, 5, 0));
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}
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void
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closebufcache(w)
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WINDOW *w;
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{
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if (w == NULL)
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return;
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wclear(w);
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wrefresh(w);
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delwin(w);
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ml_init(); /* Clear out mount list */
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}
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void
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labelbufcache()
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{
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mvwprintw(wnd, 0, 0, "There are %d buffers using %d kBytes of memory.",
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nbuf, bufbytes / 1024);
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wclrtoeol(wnd);
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wmove(wnd, 1, 0);
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wclrtoeol(wnd);
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mvwaddstr(wnd, 2, 0,
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"File System Bufs used % kB in use % Bufsize kB % Util %");
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wclrtoeol(wnd);
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}
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void
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showbufcache()
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{
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int tbuf, i, lastrow;
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long tvalid, tsize;
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struct ml_entry *ml;
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tbuf = tvalid = tsize = 0;
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lastrow = 3; /* Leave room for header. */
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for (i = lastrow, ml = LIST_FIRST(&mount_list); ml != NULL;
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i++, ml = LIST_NEXT(ml, ml_entries)) {
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/* Display in window if enough room. */
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if (i < getmaxy(wnd) - 2) {
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mvwprintw(wnd, i, 0, "%-20.20s", ml->ml_addr == NULL ?
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"NULL" : ml->ml_mount.mnt_stat.f_mntonname);
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wprintw(wnd,
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" %6d %3d %8ld %3d %8ld %3d %3d",
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ml->ml_count,
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(100 * ml->ml_count) / nbuf,
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ml->ml_valid / 1024,
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(100 * ml->ml_valid) / bufbytes,
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ml->ml_size / 1024,
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(100 * ml->ml_size) / bufbytes,
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(100 * ml->ml_valid) / ml->ml_size);
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wclrtoeol(wnd);
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lastrow = i;
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}
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/* Update statistics. */
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tbuf += ml->ml_count;
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tvalid += ml->ml_valid / 1024;
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tsize += ml->ml_size / 1024;
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}
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wclrtobot(wnd);
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mvwprintw(wnd, lastrow + 2, 0,
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"%-20s %6d %3d %8d %3d %8d %3d %3d",
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"Total:", tbuf, (100 * tbuf) / nbuf,
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tvalid, (100 * tvalid * 1024) / bufbytes,
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tsize, (100 * tsize * 1024) / bufbytes, (100 * tvalid) / tsize);
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}
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int
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initbufcache()
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{
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if (namelist[X_NBUF].n_type == 0) {
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if (kvm_nlist(kd, namelist)) {
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nlisterr(namelist);
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return(0);
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}
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if (namelist[X_NBUF].n_type == 0) {
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error("namelist on %s failed", _PATH_UNIX);
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return(0);
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}
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}
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NREAD(X_NBUF, &nbuf, sizeof(nbuf));
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NREAD(X_BUFPAGES, &bufpages, sizeof(bufpages));
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bufbytes = bufpages * sysconf(_SC_PAGESIZE);
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if ((buf = malloc(nbuf * sizeof(struct buf))) == NULL) {
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error("malloc failed");
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die(0);
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}
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NREAD(X_BUF, &bufaddr, sizeof(bufaddr));
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return(1);
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}
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void
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fetchbufcache()
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{
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int i, count;
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struct buf *bp;
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struct vnode *vn;
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struct mount *mt;
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struct ml_entry *ml;
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/* Re-read bufqueues lists and buffer cache headers */
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NREAD(X_BUFQUEUES, bufqueues, sizeof(bufqueues));
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KREAD(bufaddr, buf, sizeof(struct buf) * nbuf);
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/* Initialise vnode cache and mount list. */
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vc_init();
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ml_init();
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for (i = 0; i < BQUEUES; i++) {
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for (bp = bufqueues[i].tqh_first; bp != NULL;
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bp = bp->b_freelist.tqe_next) {
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if (bp != NULL) {
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bp = (struct buf *)((u_long)bp + (u_long)buf -
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(u_long)bufaddr);
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if (bp->b_vp != NULL) {
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vn = vc_lookup(bp->b_vp);
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if (vn == NULL)
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errx(1,
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"vc_lookup returns NULL!\n");
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if (vn->v_mount != NULL)
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mt = ml_lookup(vn->v_mount,
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bp->b_bufsize,
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bp->b_bcount);
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}
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}
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}
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}
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/* simple sort - there's not that many entries */
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do {
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if ((ml = LIST_FIRST(&mount_list)) == NULL ||
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LIST_NEXT(ml, ml_entries) == NULL)
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break;
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count = 0;
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for (ml = LIST_FIRST(&mount_list); ml != NULL;
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ml = LIST_NEXT(ml, ml_entries)) {
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if (LIST_NEXT(ml, ml_entries) == NULL)
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break;
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if (ml->ml_count < LIST_NEXT(ml, ml_entries)->ml_count) {
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ml = LIST_NEXT(ml, ml_entries);
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LIST_REMOVE(ml, ml_entries);
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LIST_INSERT_HEAD(&mount_list, ml, ml_entries);
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count++;
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}
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}
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} while (count != 0);
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}
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static void
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vc_init()
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{
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int i;
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/* vc_addr == NULL for unused cache entry. */
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for (i = 0; i < VCACHE_SIZE; i++)
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vcache[i].vc_addr = NULL;
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}
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static void
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ml_init()
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{
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struct ml_entry *ml;
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/* Throw out the current mount list and start again. */
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while ((ml = LIST_FIRST(&mount_list)) != NULL) {
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LIST_REMOVE(ml, ml_entries);
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free(ml);
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}
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}
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static struct vnode *
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vc_lookup(vaddr)
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struct vnode *vaddr;
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{
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struct vnode *ret;
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int i, oldest, match;
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ret = NULL;
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oldest = match = 0;
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for (i = 0; i < VCACHE_SIZE || vcache[i].vc_addr == NULL; i++) {
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vcache[i].vc_age++;
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if (vcache[i].vc_addr == NULL)
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break;
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if (vcache[i].vc_age < vcache[oldest].vc_age)
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oldest = i;
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if (vcache[i].vc_addr == vaddr) {
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vcache[i].vc_age = 0;
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match = i;
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ret = &vcache[i].vc_node;
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}
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}
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/* Find an entry in the cache? */
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if (ret != NULL)
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return(ret);
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/* Go past the end of the cache? */
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if (i >= VCACHE_SIZE)
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i = oldest;
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/* Read in new vnode and reset age counter. */
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KREAD(vaddr, &vcache[i].vc_node, sizeof(struct vnode));
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vcache[i].vc_addr = vaddr;
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vcache[i].vc_age = 0;
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return(&vcache[i].vc_node);
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}
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static struct mount *
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ml_lookup(maddr, size, valid)
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struct mount *maddr;
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int size, valid;
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{
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struct ml_entry *ml;
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for (ml = LIST_FIRST(&mount_list); ml != NULL;
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ml = LIST_NEXT(ml, ml_entries))
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if (ml->ml_addr == maddr) {
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ml->ml_count++;
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ml->ml_size += size;
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ml->ml_valid += valid;
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if (ml->ml_addr == NULL)
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return(NULL);
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else
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return(&ml->ml_mount);
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}
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if ((ml = malloc(sizeof(struct ml_entry))) == NULL) {
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error("out of memory");
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die(0);
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}
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LIST_INSERT_HEAD(&mount_list, ml, ml_entries);
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ml->ml_count = 1;
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ml->ml_size = size;
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ml->ml_valid = valid;
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ml->ml_addr = maddr;
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if (maddr == NULL)
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return(NULL);
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KREAD(maddr, &ml->ml_mount, sizeof(struct mount));
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return(&ml->ml_mount);
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}
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