xref: /dragonfly/lib/libkcore/kcore_sched.c (revision e4700cfb)

/*
 * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Joerg Sonnenberger <joerg@bec.de>.
 *
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE
 * COPYRIGHT HOLDERS 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.
 */

#include <sys/kinfo.h>
#include <sys/param.h>

#include <assert.h>
#include <err.h>
#include <errno.h>
#include <kcore.h>
#include <kvm.h>
#include <nlist.h>
#include <stdlib.h>

#include "kcore_private.h"

int
kcore_get_cpus(struct kcore_data *kc, int *ncpus)
{
	static struct nlist nl[] = {
		{ "_ncpus", 0, 0, 0, 0},
		{ NULL, 0, 0, 0, 0}
	};

	/* XXX always include ncpus in the kernel. */
	if (kcore_get_generic(kc, nl, ncpus, sizeof(*ncpus)))
		*ncpus = 1;
	return(0);
}

int
kcore_get_sched_cputime(struct kcore_data *kc, struct kinfo_cputime *cputime)
{
	struct kinfo_cputime *percpu = NULL;
	static struct nlist nl[] = {
		{ "cputime_percpu", 0, 0, 0, 0},
		{ NULL, 0, 0, 0, 0}
	};
	size_t len;
	int cpucount, error = 0;

	_DIAGASSERT(cputime != NULL);

	error = kcore_get_cpus(kc, &cpucount);
	if (error)
		goto done;

	len = sizeof(*percpu) * cpucount;

	if ((percpu = malloc(len)) == NULL) {
		error = ENOMEM;
		goto done;
	}

	/* retrieve verbatim per-cpu statistics from kernel core */
	error = kcore_get_generic(kc, nl, percpu, len);
	if (error)
		goto done;

	/* aggregate per-cpu statistics retrieved from kernel core */
	cputime_pcpu_statistics(percpu, cputime, cpucount);

done:
	if (percpu != NULL) {
		free(percpu);
		percpu = NULL;
	}
	return (error);
}

int
kcore_get_sched_hz(struct kcore_data *kc, int *hz)
{
	static struct nlist nl[] = {
		{ "_hz", 0, 0, 0, 0},
		{ NULL, 0, 0, 0, 0}
	};

	return(kcore_get_generic(kc, nl, hz, sizeof(*hz)));
}

int
kcore_get_sched_profhz(struct kcore_data *kc, int *profhz)
{
	static struct nlist nl[] = {
		{ "_profhz", 0, 0, 0, 0},
		{ NULL, 0, 0, 0, 0}
	};

	return(kcore_get_generic(kc, nl, profhz, sizeof(*profhz)));
}

int
kcore_get_sched_stathz(struct kcore_data *kc, int *stathz)
{
	static struct nlist nl[] = {
		{ "_stathz", 0, 0, 0, 0},
		{ NULL, 0, 0, 0, 0}
	};
	int retval;

	retval = kcore_get_generic(kc, nl, stathz, sizeof(*stathz));
	if (retval == 0 && *stathz == 0)
		return(kcore_get_sched_hz(kc, stathz));
	return(retval);
}