2 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Hiten Pandya <hmp@backplane.com>.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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
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.
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
34 * $DragonFly: src/lib/libkvm/kvm_util.c,v 1.3 2004/07/16 07:04:36 hmp Exp $
38 * Useful functions that are used across the source base for
42 #include <sys/param.h>
43 #include <sys/nchstats.h>
44 #include <sys/sysctl.h>
52 * Aggregate the per-cpu counters we retrieved via sysctl(2)
53 * to give the total across the CPUs. Use a nasty trick to
54 * aggregate the counters in the structure! YYY
57 kvm_nch_cpuagg(struct nchstats
*unagg
, struct nchstats
*ttl
, int cpucnt
)
60 siz
= sizeof(struct nchstats
);
67 /* kick hmp@ for this nasty loop! :-) */
68 for (i
= 0; i
< cpucnt
; ++i
) {
69 for (off
= 0; off
< siz
; off
+= sizeof(u_long
)) {
70 *(u_long
*)((char *)(*(&ttl
)) + off
) +=
71 *(u_long
*)((char *)&unagg
[i
] + off
);