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>.
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8 * modification, are permitted provided that the following conditions
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34 * $DragonFly: src/test/pcpu/ncache-stats.c,v 1.4 2005/03/07 04:19:22 hmp Exp $
37 #include <sys/param.h>
38 #include <sys/nchstats.h>
39 #include <sys/sysctl.h>
40 #include <sys/accumulator.h>
48 #define _NCH_ENT(t, n, tt) \
50 for (i = 1; i <= ncpus; ++i) { \
51 printf("%-9ld%s", nch[i-1]. #n, "\t"); \
53 printf("(%-9ld)\n", tt. #n); \
57 * Aggregate the per-cpu counters we retrieved via sysctl(2)
58 * to give the total across the CPUs. Use a nasty trick to
59 * aggregate the counters in the structure! YYY
63 nch_cpuagg(struct nchstats *unagg, struct nchstats *ttl, int cpucnt)
66 siz = sizeof(struct nchstats);
73 /* kick hmp@ for this nasty loop! :-) */
74 for (i = 0; i < cpucnt; ++i) {
75 for (off = 0; off < siz; off += sizeof(u_long)) {
76 *(u_long *)((char *)(*(&ttl)) + off) +=
77 *(u_long *)((char *)&unagg[i] + off);
86 struct nchstats *nch, total;
87 size_t nch_len = SMP_MAXCPU * sizeof(struct nchstats);
90 nch = malloc(nch_len);
94 /* retrieve the statistics */
95 if (sysctlbyname("vfs.cache.nchstats", nch, &nch_len, NULL, 0) < 0) {
99 nch = realloc(nch, nch_len);
104 ncpus = nch_len / sizeof(struct nchstats);
107 printf("Number of processors = %d\n", ncpus);
110 kvm_nch_cpuagg(nch, &total, ncpus);
111 nchtotal = total.ncs_goodhits + total.ncs_neghits +
112 total.ncs_badhits + total.ncs_falsehits +
113 total.ncs_miss + total.ncs_long;
115 printf("VFS Name Cache Effectiveness Statistics\n");
116 printf("%9ld total name lookups\n",nchtotal);
118 printf("%-20s", "COUNTER");
120 for (i = 1; i <= ncpus; ++i) {
121 printf("%3s-%-2d%s", "CPU", i, "\t");
123 printf("\t%-9s\n", "TOTAL");
126 _NCH_ENT("goodhits", ncs_goodhits, total);
127 _NCH_ENT("neghits", ncs_neghits, total);
128 _NCH_ENT("badhits", ncs_badhits, total);
129 _NCH_ENT("falsehits", ncs_falsehits, total);
130 _NCH_ENT("misses", ncs_miss, total);
131 _NCH_ENT("longnames", ncs_long, total);
132 _NCH_ENT("passes 2", ncs_pass2, total);
133 _NCH_ENT("2-passes", ncs_2passes, total);