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32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34 __SCCSID("@(#)kvm_getloadavg.c 8.1 (Berkeley) 6/4/93");
36 #include <sys/param.h>
38 #include <sys/resource.h>
45 #include "kvm_private.h"
47 static struct nlist nl[] = {
48 { .n_name = "_averunnable" },
49 #define X_AVERUNNABLE 0
50 { .n_name = "_fscale" },
56 * kvm_getloadavg() -- Get system load averages, from live or dead kernels.
58 * Put `nelem' samples into `loadavg' array.
59 * Return number of samples retrieved, or -1 on error.
62 kvm_getloadavg(kvm_t *kd, double loadavg[], int nelem)
64 struct loadavg loadinfo;
68 return (getloadavg(loadavg, nelem));
70 if (!kd->arch->ka_native(kd)) {
71 _kvm_err(kd, kd->program,
72 "cannot read loadavg from non-native core");
76 if (kvm_nlist(kd, nl) != 0 && nl[X_AVERUNNABLE].n_type == 0) {
77 _kvm_err(kd, kd->program,
78 "%s: no such symbol", nl[X_AVERUNNABLE].n_name);
82 #define KREAD(kd, addr, obj) \
83 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj))
84 if (KREAD(kd, nl[X_AVERUNNABLE].n_value, &loadinfo)) {
85 _kvm_err(kd, kd->program, "can't read averunnable");
90 * Old kernels have fscale separately; if not found assume
93 if (nl[X_FSCALE].n_type != 0 &&
94 !KREAD(kd, nl[X_FSCALE].n_value, &fscale))
95 loadinfo.fscale = fscale;
97 nelem = MIN(nelem, (int)(sizeof(loadinfo.ldavg) / sizeof(fixpt_t)));
98 for (i = 0; i < nelem; i++)
99 loadavg[i] = (double) loadinfo.ldavg[i] / loadinfo.fscale;