1 files changed, 134 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_cptime.c b/lib/libkvm/kvm_cptime.c
new file mode 100644
index 0000000..08f3fca
--- /dev/null
+++ b/lib/libkvm/kvm_cptime.c
@@ -0,0 +1,134 @@
+/*-
+ * Copyright (c) 2008 Yahoo!, Inc.
+ * All rights reserved.
+ * Written by: John Baldwin <jhb@FreeBSD.org>
+ *
+ * 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 author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/pcpu.h>
+#include <sys/resource.h>
+#include <sys/sysctl.h>
+#include <errno.h>
+#include <kvm.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "kvm_private.h"
+
+static struct nlist kvm_cp_time_nl[] = {
+	{ .n_name = "_cp_time" },		/* (deprecated) */
+	{ .n_name = NULL },
+};
+
+#define	NL_CP_TIME		0
+
+static int kvm_cp_time_cached;
+
+static int
+_kvm_cp_time_init(kvm_t *kd)
+{
+
+	if (kvm_nlist(kd, kvm_cp_time_nl) < 0)
+		return (-1);
+	kvm_cp_time_cached = 1;
+	return (0);
+}
+
+static int
+getsysctl(kvm_t *kd, const char *name, void *buf, size_t len)
+{
+	size_t nlen;
+
+	nlen = len;
+	if (sysctlbyname(name, buf, &nlen, NULL, 0) < 0) {
+		_kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name,
+		    strerror(errno));
+		return (-1);
+	}
+	if (nlen != len) {
+		_kvm_err(kd, kd->program, "sysctl %s has unexpected size",
+		    name);
+		return (-1);
+	}
+	return (0);
+}
+
+int
+kvm_getcptime(kvm_t *kd, long *cp_time)
+{
+	struct pcpu *pc;
+	int i, j, maxcpu;
+
+	if (kd == NULL) {
+		kvm_cp_time_cached = 0;
+		return (0);
+	}
+
+	if (ISALIVE(kd))
+		return (getsysctl(kd, "kern.cp_time", cp_time, sizeof(long) *
+		    CPUSTATES));
+
+	if (kvm_cp_time_cached == 0) {
+		if (_kvm_cp_time_init(kd) < 0)
+			return (-1);
+	}
+
+	/* If this kernel has a "cp_time[]" symbol, then just read that. */
+	if (kvm_cp_time_nl[NL_CP_TIME].n_value != 0) {
+		if (kvm_read(kd, kvm_cp_time_nl[NL_CP_TIME].n_value, cp_time,
+		    sizeof(long) * CPUSTATES) != sizeof(long) * CPUSTATES) {
+			_kvm_err(kd, kd->program, "cannot read cp_time array");
+			return (-1);
+		}
+		return (0);
+	}
+
+	/*
+	 * If we don't have that symbol, then we have to simulate
+	 * "cp_time[]" by adding up the individual times for each CPU.
+	 */
+	maxcpu = kvm_getmaxcpu(kd);
+	if (maxcpu < 0)
+		return (-1);
+	for (i = 0; i < CPUSTATES; i++)
+		cp_time[i] = 0;
+	for (i = 0; i < maxcpu; i++) {
+		pc = kvm_getpcpu(kd, i);
+		if (pc == NULL)
+			continue;
+		if (pc == (void *)-1)
+			return (-1);
+		for (j = 0; j < CPUSTATES; j++)
+			cp_time[j] += pc->pc_cp_time[j];
+		free(pc);
+	}
+	return (0);
+}