1 /* 2 * Copyright (c) 2003-2004. Hiten Pandya <hmp@backplane.com>. 3 * 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following 12 * disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY HITEN PANDYA AND CONTRIBUTORS "AS IS" AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL HITEN PANDYA OR CONTRIBUTORS 22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 25 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 26 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 27 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 28 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $DragonFly: src/lib/libkvm/kvm_util.c,v 1.1 2004/04/02 05:46:02 hmp Exp $ 31 */ 32 33 /* 34 * Useful functions that are used across the source base for 35 * various purpose. 36 */ 37 38 #include <sys/param.h> 39 #include <sys/nchstats.h> 40 #include <sys/sysctl.h> 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <strings.h> 45 #include <err.h> 46 47 /* 48 * Aggregate the per-cpu counters we retrieved via sysctl(2) 49 * to give the total across the CPUs. Use a nasty trick to 50 * aggregate the counters in the structure! YYY 51 */ 52 void 53 kvm_nch_cpuagg(struct nchstats *unagg, struct nchstats *ttl, int cpucnt) 54 { 55 int i, off, siz; 56 siz = sizeof(struct nchstats); 57 58 if (!unagg && !ttl) 59 return; 60 61 bzero(ttl, siz); 62 63 /* kick hmp@ for this nasty loop! :-) */ 64 for (i = 0; i < cpucnt; ++i) { 65 for (off = 0; off < siz; off += sizeof(u_long)) { 66 *(u_long *)((char *)(*(&ttl)) + off) += 67 *(u_long *)((char *)&unagg[i] + off); 68 } 69 } 70 } 71