1 /* 2 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Hiten Pandya <hmp@backplane.com>. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following 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 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /* 36 * Useful functions that are used across the source base for 37 * various purpose. 38 */ 39 40 #include <sys/param.h> 41 #include <sys/nchstats.h> 42 #include <sys/sysctl.h> 43 #include <strings.h> 44 45 #include "kvm.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