/*
 * Copyright (c) 2003-2004.  Hiten Pandya <hmp@backplane.com>.
 * 
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *       
 * THIS SOFTWARE IS PROVIDED BY HITEN PANDYA AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL HITEN PANDYA OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $DragonFly: src/test/pcpu/ncache-stats.c,v 1.1 2004/04/02 05:46:03 hmp Exp $
 */

#include <sys/param.h>
#include <sys/nchstats.h>
#include <sys/sysctl.h>

#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <err.h>
#include <kvm.h>

#define _NCH_ENT(t, n, tt)                       \
    printf("%-20s", t);                          \
    for (i = 1; i <= ncpus; ++i) {               \
        printf("%-9ld%s", nch[i-1]. ## n, "\t"); \
		if (i == ncpus)                          \
			printf("(%-9ld)\n", tt. ## n);       \
	}                                            \

/*
 * Aggregate the per-cpu counters we retrieved via sysctl(2)
 * to give the total across the CPUs.  Use a nasty trick to
 * aggregate the counters in the structure! YYY
 */
#if 0
static void
nch_cpuagg(struct nchstats *unagg, struct nchstats *ttl, int cpucnt)
{
	int i, off, siz;
	siz = sizeof(struct nchstats);

	if (!unagg && !ttl)
		return;

	bzero(ttl, siz);
	
	/* kick hmp@ for this nasty loop! :-) */
	for (i = 0; i < cpucnt; ++i) {
		for (off = 0; off < siz; off += sizeof(u_long)) {
			*(u_long *)((char *)(*(&ttl)) + off) +=
			*(u_long *)((char *)&unagg[i] + off);
		}
	}
}
#endif

int main(void)
{
	int i, ncpus;
	struct nchstats *nch, total;
	size_t nch_len = SMP_MAXCPU * sizeof(struct nchstats);
	u_long nchtotal;

	nch = malloc(nch_len);
	if (!nch)
		exit(-1);

	/* retrieve the statistics */
	if (sysctlbyname("vfs.cache.nchstats", nch, &nch_len, NULL, 0) < 0) {
		warn("sysctl");
		exit(-1);
	} else {
		nch = realloc(nch, nch_len);
		if (!nch)
			exit(-1);
	}

	ncpus = nch_len / sizeof(struct nchstats);

#if defined(DEBUG)
	printf("Number of processors = %d\n", ncpus);
#endif

	kvm_nch_cpuagg(nch, &total, ncpus);
	nchtotal = total.ncs_goodhits + total.ncs_neghits +
	    total.ncs_badhits + total.ncs_falsehits +
	    total.ncs_miss + total.ncs_long;

	printf("VFS Name Cache Effectiveness Statistics\n");
	printf("%9ld total name lookups\n",nchtotal);

	printf("%-20s", "COUNTER");
	
	for (i = 1; i <= ncpus; ++i) {
		printf("%3s-%-2d%s", "CPU", i, "\t");
		if (i == ncpus)
			printf("\t%-9s\n", "TOTAL");
	}

	_NCH_ENT("goodhits", ncs_goodhits, total);
	_NCH_ENT("neghits", ncs_neghits, total);
	_NCH_ENT("badhits", ncs_badhits, total);
	_NCH_ENT("falsehits", ncs_falsehits, total);
	_NCH_ENT("misses", ncs_miss, total);
	_NCH_ENT("longnames", ncs_long, total);
	_NCH_ENT("passes 2", ncs_pass2, total);
	_NCH_ENT("2-passes", ncs_2passes, total);

	free(nch);

	return 0;
}