mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
/* $FreeBSD$ */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <nlist.h>
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#include <sysexits.h>
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#include <sys/uio.h>
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#include <sys/namei.h>
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#include <sys/param.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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/*----------------------------------*/
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static u_int crc16_table[16] = {
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0x0000, 0xCC01, 0xD801, 0x1400,
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0xF001, 0x3C00, 0x2800, 0xE401,
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0xA001, 0x6C00, 0x7800, 0xB401,
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0x5000, 0x9C01, 0x8801, 0x4400
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};
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/* XXX Taken from sys/kern/vfs_cache.c */
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struct namecache {
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LIST_ENTRY(namecache) nc_hash;
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LIST_ENTRY(namecache) nc_src;
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TAILQ_ENTRY(namecache) nc_dst;
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struct vnode *nc_dvp;
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struct vnode *nc_vp;
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u_char nc_flag;
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u_char nc_nlen;
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char nc_name[0];
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};
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static u_short
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wlpsacrc(u_char *buf, u_int len)
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{
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u_short crc = 0;
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int i, r1;
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for (i = 0; i < len; i++, buf++) {
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/* lower 4 bits */
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r1 = crc16_table[crc & 0xF];
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crc = (crc >> 4) & 0x0FFF;
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crc = crc ^ r1 ^ crc16_table[*buf & 0xF];
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/* upper 4 bits */
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r1 = crc16_table[crc & 0xF];
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crc = (crc >> 4) & 0x0FFF;
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crc = crc ^ r1 ^ crc16_table[(*buf >> 4) & 0xF];
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}
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return(crc);
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}
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/*----------------------------------*/
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struct nlist nl[] = {
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{ "_nchash", 0},
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{ "_nchashtbl", 0},
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{ 0, 0 },
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};
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int histo[2047];
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int histn[2047];
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int *newbucket;
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int
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main(int argc, char **argv)
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{
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int nchash, i, j, k, kn;
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int nb, p1, p2;
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u_long p;
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LIST_HEAD(nchashhead, namecache) *nchashtbl;
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struct namecache *nc;
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struct vnode vn;
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kvm_t *kvm = kvm_open(NULL, NULL, NULL, O_RDONLY, argv[0]);
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if (kvm == NULL)
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return(EX_OSERR);
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printf("kvm: %p\n", kvm);
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printf("kvm_nlist: %d\n", kvm_nlist(kvm, nl));
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kvm_read(kvm, nl[0].n_value, &nchash, sizeof nchash);
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nchash++;
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nchashtbl = malloc(nchash * sizeof *nchashtbl);
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nc = malloc(sizeof *nc + NAME_MAX);
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newbucket = malloc(nchash * sizeof (int));
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memset(newbucket, 0, nchash * sizeof (int));
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kvm_read(kvm, nl[1].n_value, &p, sizeof p);
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kvm_read(kvm, p, nchashtbl, nchash * sizeof *nchashtbl);
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for (i=0; i < nchash; i++) {
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#if 0
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printf("%d\n", i);
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#endif
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nb=0;
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p = (u_long)LIST_FIRST(nchashtbl+i);
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while (p) {
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nb++;
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kvm_read(kvm, p, nc, sizeof *nc + NAME_MAX);
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kvm_read(kvm, (u_long)nc->nc_dvp, &vn, sizeof vn);
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nc->nc_name[nc->nc_nlen] = '\0';
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for (j=k=kn=0;nc->nc_name[j];j++) {
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k+= nc->nc_name[j];
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kn <<= 1;
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kn+= nc->nc_name[j];
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}
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/*
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kn = k;
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*/
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kn = wlpsacrc(nc->nc_name,nc->nc_nlen);
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/* kn += (u_long)vn.v_data >> 8; */
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/* kn += (u_long)nc->nc_dvp >> 7; */
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kn += vn.v_id;
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kn &= (nchash - 1);
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newbucket[kn]++;
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#if 1
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printf("%4d dvp %08x hash %08x vp %08x id %08x name <%s>\n",
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i,nc->nc_dvp, k, nc->nc_vp, vn.v_id, nc->nc_name);
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#endif
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p = (u_long)LIST_NEXT(nc, nc_hash);
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}
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histo[nb]++;
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}
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for (i=0; i < nchash; i++) {
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histn[newbucket[i]]++;
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}
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p1=p2 = 0;
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for (i=0;i<30;i++) {
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p1 += histo[i] * i;
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p2 += histn[i] * i;
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if (histo[i] || histn[i])
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printf("H%02d %4d %4d / %4d %4d\n",i,histo[i], p1 , histn[i], p2);
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}
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return (0);
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}
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