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
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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
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24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/test/pcpu/ncache-stats.c,v 1.3 2004/07/16 05:04:36 hmp Exp $
37 #include <sys/param.h>
38 #include <sys/nchstats.h>
39 #include <sys/sysctl.h>
47 #define _NCH_ENT(t, n, tt) \
49 for (i = 1; i <= ncpus; ++i) { \
50 printf("%-9ld%s", nch[i-1]. ## n, "\t"); \
52 printf("(%-9ld)\n", tt. ## n); \
56 * Aggregate the per-cpu counters we retrieved via sysctl(2)
57 * to give the total across the CPUs. Use a nasty trick to
58 * aggregate the counters in the structure! YYY
62 nch_cpuagg(struct nchstats *unagg, struct nchstats *ttl, int cpucnt)
65 siz = sizeof(struct nchstats);
72 /* kick hmp@ for this nasty loop! :-) */
73 for (i = 0; i < cpucnt; ++i) {
74 for (off = 0; off < siz; off += sizeof(u_long)) {
75 *(u_long *)((char *)(*(&ttl)) + off) +=
76 *(u_long *)((char *)&unagg[i] + off);
85 struct nchstats *nch, total;
86 size_t nch_len = SMP_MAXCPU * sizeof(struct nchstats);
89 nch = malloc(nch_len);
93 /* retrieve the statistics */
94 if (sysctlbyname("vfs.cache.nchstats", nch, &nch_len, NULL, 0) < 0) {
98 nch = realloc(nch, nch_len);
103 ncpus = nch_len / sizeof(struct nchstats);
106 printf("Number of processors = %d\n", ncpus);
109 kvm_nch_cpuagg(nch, &total, ncpus);
110 nchtotal = total.ncs_goodhits + total.ncs_neghits +
111 total.ncs_badhits + total.ncs_falsehits +
112 total.ncs_miss + total.ncs_long;
114 printf("VFS Name Cache Effectiveness Statistics\n");
115 printf("%9ld total name lookups\n",nchtotal);
117 printf("%-20s", "COUNTER");
119 for (i = 1; i <= ncpus; ++i) {
120 printf("%3s-%-2d%s", "CPU", i, "\t");
122 printf("\t%-9s\n", "TOTAL");
125 _NCH_ENT("goodhits", ncs_goodhits, total);
126 _NCH_ENT("neghits", ncs_neghits, total);
127 _NCH_ENT("badhits", ncs_badhits, total);
128 _NCH_ENT("falsehits", ncs_falsehits, total);
129 _NCH_ENT("misses", ncs_miss, total);
130 _NCH_ENT("longnames", ncs_long, total);
131 _NCH_ENT("passes 2", ncs_pass2, total);
132 _NCH_ENT("2-passes", ncs_2passes, total);