[rtems-libbsd commit] VMSTAT(8): Import from FreeBSD

Sebastian Huber sebh at rtems.org
Tue Jan 10 10:06:12 UTC 2017


Module:    rtems-libbsd
Branch:    master
Commit:    dba2dfc663d4b96b8f14609fec72246f8e60f9c5
Changeset: http://git.rtems.org/rtems-libbsd/commit/?id=dba2dfc663d4b96b8f14609fec72246f8e60f9c5

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Thu Nov 10 13:25:27 2016 +0100

VMSTAT(8): Import from FreeBSD

---

 freebsd/usr.bin/vmstat/vmstat.c | 1731 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 1731 insertions(+)

diff --git a/freebsd/usr.bin/vmstat/vmstat.c b/freebsd/usr.bin/vmstat/vmstat.c
new file mode 100644
index 0000000..ae5fd5f
--- /dev/null
+++ b/freebsd/usr.bin/vmstat/vmstat.c
@@ -0,0 +1,1731 @@
+#include <machine/rtems-bsd-user-space.h>
+
+/*
+ * Copyright (c) 1980, 1986, 1991, 1993
+ *	The Regents of the University of California.  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.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ */
+
+#ifndef lint
+static const char copyright[] =
+"@(#) Copyright (c) 1980, 1986, 1991, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#if 0
+#ifndef lint
+static char sccsid[] = "@(#)vmstat.c	8.1 (Berkeley) 6/6/93";
+#endif /* not lint */
+#endif
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/sys/param.h>
+#include <sys/proc.h>
+#include <sys/uio.h>
+#include <sys/namei.h>
+#include <sys/malloc.h>
+#include <sys/signal.h>
+#include <sys/fcntl.h>
+#include <sys/ioctl.h>
+#include <rtems/bsd/sys/resource.h>
+#include <sys/sysctl.h>
+#include <sys/time.h>
+#include <sys/user.h>
+#include <sys/vmmeter.h>
+#include <sys/pcpu.h>
+
+#include <vm/vm_param.h>
+
+#include <ctype.h>
+#include <devstat.h>
+#include <err.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <kvm.h>
+#include <limits.h>
+#include <memstat.h>
+#include <nlist.h>
+#include <paths.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <time.h>
+#include <unistd.h>
+#include <libutil.h>
+#include <libxo/xo.h>
+
+#define VMSTAT_XO_VERSION "1"
+
+static char da[] = "da";
+
+static struct nlist namelist[] = {
+#define X_SUM		0
+	{ "_vm_cnt" },
+#define X_HZ		1
+	{ "_hz" },
+#define X_STATHZ	2
+	{ "_stathz" },
+#define X_NCHSTATS	3
+	{ "_nchstats" },
+#define	X_INTRNAMES	4
+	{ "_intrnames" },
+#define	X_SINTRNAMES	5
+	{ "_sintrnames" },
+#define	X_INTRCNT	6
+	{ "_intrcnt" },
+#define	X_SINTRCNT	7
+	{ "_sintrcnt" },
+#ifdef notyet
+#define	X_DEFICIT	XXX
+	{ "_deficit" },
+#define X_REC		XXX
+	{ "_rectime" },
+#define X_PGIN		XXX
+	{ "_pgintime" },
+#define	X_XSTATS	XXX
+	{ "_xstats" },
+#define X_END		XXX
+#else
+#define X_END		8
+#endif
+	{ "" },
+};
+
+static struct statinfo cur, last;
+static int num_devices, maxshowdevs;
+static long generation;
+static struct device_selection *dev_select;
+static int num_selected;
+static struct devstat_match *matches;
+static int num_matches = 0;
+static int num_devices_specified, num_selections;
+static long select_generation;
+static char **specified_devices;
+static devstat_select_mode select_mode;
+
+static struct	vmmeter sum, osum;
+
+#define	VMSTAT_DEFAULT_LINES	20	/* Default number of `winlines'. */
+volatile sig_atomic_t wresized;		/* Tty resized, when non-zero. */
+static int winlines = VMSTAT_DEFAULT_LINES; /* Current number of tty rows. */
+
+static int	aflag;
+static int	nflag;
+static int	Pflag;
+static int	hflag;
+
+static kvm_t   *kd;
+
+#define	FORKSTAT	0x01
+#define	INTRSTAT	0x02
+#define	MEMSTAT		0x04
+#define	SUMSTAT		0x08
+#define	TIMESTAT	0x10
+#define	VMSTAT		0x20
+#define ZMEMSTAT	0x40
+#define	OBJSTAT		0x80
+
+static void	cpustats(void);
+static void	pcpustats(int, u_long, int);
+static void	devstats(void);
+static void	doforkst(void);
+static void	dointr(unsigned int, int);
+static void	doobjstat(void);
+static void	dosum(void);
+static void	dovmstat(unsigned int, int);
+static void	domemstat_malloc(void);
+static void	domemstat_zone(void);
+static void	kread(int, void *, size_t);
+static void	kreado(int, void *, size_t, size_t);
+static char    *kgetstr(const char *);
+static void	needhdr(int);
+static void	needresize(int);
+static void	doresize(void);
+static void	printhdr(int, u_long);
+static void	usage(void);
+
+static long	pct(long, long);
+static long long	getuptime(void);
+
+static char   **getdrivedata(char **);
+
+int
+main(int argc, char *argv[])
+{
+	int c, todo;
+	unsigned int interval;
+	float f;
+	int reps;
+	char *memf, *nlistf;
+	char errbuf[_POSIX2_LINE_MAX];
+
+	memf = nlistf = NULL;
+	interval = reps = todo = 0;
+	maxshowdevs = 2;
+	hflag = isatty(1);
+
+	argc = xo_parse_args(argc, argv);
+	if (argc < 0)
+		return argc;
+
+	while ((c = getopt(argc, argv, "ac:fhHiM:mN:n:oPp:stw:z")) != -1) {
+		switch (c) {
+		case 'a':
+			aflag++;
+			break;
+		case 'c':
+			reps = atoi(optarg);
+			break;
+		case 'P':
+			Pflag++;
+			break;
+		case 'f':
+			todo |= FORKSTAT;
+			break;
+		case 'h':
+			hflag = 1;
+			break;
+		case 'H':
+			hflag = 0;
+			break;
+		case 'i':
+			todo |= INTRSTAT;
+			break;
+		case 'M':
+			memf = optarg;
+			break;
+		case 'm':
+			todo |= MEMSTAT;
+			break;
+		case 'N':
+			nlistf = optarg;
+			break;
+		case 'n':
+			nflag = 1;
+			maxshowdevs = atoi(optarg);
+			if (maxshowdevs < 0)
+				xo_errx(1, "number of devices %d is < 0",
+				     maxshowdevs);
+			break;
+		case 'o':
+			todo |= OBJSTAT;
+			break;
+		case 'p':
+			if (devstat_buildmatch(optarg, &matches, &num_matches) != 0)
+				xo_errx(1, "%s", devstat_errbuf);
+			break;
+		case 's':
+			todo |= SUMSTAT;
+			break;
+		case 't':
+#ifdef notyet
+			todo |= TIMESTAT;
+#else
+			xo_errx(EX_USAGE, "sorry, -t is not (re)implemented yet");
+#endif
+			break;
+		case 'w':
+			/* Convert to milliseconds. */
+			f = atof(optarg);
+			interval = f * 1000;
+			break;
+		case 'z':
+			todo |= ZMEMSTAT;
+			break;
+		case '?':
+		default:
+			usage();
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	xo_set_version(VMSTAT_XO_VERSION);
+	if (todo == 0)
+		todo = VMSTAT;
+
+	if (memf != NULL) {
+		kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
+		if (kd == NULL)
+			xo_errx(1, "kvm_openfiles: %s", errbuf);
+	}
+
+retry_nlist:
+	if (kd != NULL && (c = kvm_nlist(kd, namelist)) != 0) {
+		if (c > 0) {
+			int bufsize = 0, len = 0;
+			char *buf, *bp;
+			/*
+			 * 'cnt' was renamed to 'vm_cnt'. If 'vm_cnt' is not
+			 * found try looking up older 'cnt' symbol.
+			 * */
+			if (namelist[X_SUM].n_type == 0 &&
+			    strcmp(namelist[X_SUM].n_name, "_vm_cnt") == 0) {
+				namelist[X_SUM].n_name = "_cnt";
+				goto retry_nlist;
+			}
+			for (c = 0;
+			     c < (int)(sizeof(namelist)/sizeof(namelist[0]));
+			     c++)
+				if (namelist[c].n_type == 0)
+					bufsize += strlen(namelist[c].n_name) + 1;
+			bufsize += len + 1;
+			buf = bp = alloca(bufsize);
+
+			for (c = 0;
+			     c < (int)(sizeof(namelist)/sizeof(namelist[0]));
+			     c++)
+				if (namelist[c].n_type == 0) {
+					xo_error(" %s",
+					    namelist[c].n_name);
+					len = strlen(namelist[c].n_name);
+					*bp++ = ' ';
+					memcpy(bp, namelist[c].n_name, len);
+					bp += len;
+				}
+			*bp = '\0';
+			xo_error("undefined symbols:\n", buf);
+		} else
+			xo_warnx("kvm_nlist: %s", kvm_geterr(kd));
+		xo_finish();
+		exit(1);
+	}
+	if (kd && Pflag)
+		xo_errx(1, "Cannot use -P with crash dumps");
+
+	if (todo & VMSTAT) {
+		/*
+		 * Make sure that the userland devstat version matches the
+		 * kernel devstat version.  If not, exit and print a
+		 * message informing the user of his mistake.
+		 */
+		if (devstat_checkversion(NULL) < 0)
+			xo_errx(1, "%s", devstat_errbuf);
+
+
+		argv = getdrivedata(argv);
+	}
+
+	if (*argv) {
+		f = atof(*argv);
+		interval = f * 1000;
+		if (*++argv)
+			reps = atoi(*argv);
+	}
+
+	if (interval) {
+		if (!reps)
+			reps = -1;
+	} else if (reps)
+		interval = 1 * 1000;
+
+	if (todo & FORKSTAT)
+		doforkst();
+	if (todo & MEMSTAT)
+		domemstat_malloc();
+	if (todo & ZMEMSTAT)
+		domemstat_zone();
+	if (todo & SUMSTAT)
+		dosum();
+	if (todo & OBJSTAT)
+		doobjstat();
+#ifdef notyet
+	if (todo & TIMESTAT)
+		dotimes();
+#endif
+	if (todo & INTRSTAT)
+		dointr(interval, reps);
+	if (todo & VMSTAT)
+		dovmstat(interval, reps);
+	xo_finish();
+	exit(0);
+}
+
+static int
+mysysctl(const char *name, void *oldp, size_t *oldlenp,
+    void *newp, size_t newlen)
+{
+	int error;
+
+	error = sysctlbyname(name, oldp, oldlenp, newp, newlen);
+	if (error != 0 && errno != ENOMEM)
+		xo_err(1, "sysctl(%s)", name);
+	return (error);
+}
+
+static char **
+getdrivedata(char **argv)
+{
+	if ((num_devices = devstat_getnumdevs(NULL)) < 0)
+		xo_errx(1, "%s", devstat_errbuf);
+
+	cur.dinfo = (struct devinfo *)calloc(1, sizeof(struct devinfo));
+	last.dinfo = (struct devinfo *)calloc(1, sizeof(struct devinfo));
+
+	if (devstat_getdevs(NULL, &cur) == -1)
+		xo_errx(1, "%s", devstat_errbuf);
+
+	num_devices = cur.dinfo->numdevs;
+	generation = cur.dinfo->generation;
+
+	specified_devices = (char **)malloc(sizeof(char *));
+	for (num_devices_specified = 0; *argv; ++argv) {
+		if (isdigit(**argv))
+			break;
+		num_devices_specified++;
+		specified_devices = (char **)realloc(specified_devices,
+						     sizeof(char *) *
+						     num_devices_specified);
+		specified_devices[num_devices_specified - 1] = *argv;
+	}
+	dev_select = NULL;
+
+	if (nflag == 0 && maxshowdevs < num_devices_specified)
+			maxshowdevs = num_devices_specified;
+
+	/*
+	 * People are generally only interested in disk statistics when
+	 * they're running vmstat.  So, that's what we're going to give
+	 * them if they don't specify anything by default.  We'll also give
+	 * them any other random devices in the system so that we get to
+	 * maxshowdevs devices, if that many devices exist.  If the user
+	 * specifies devices on the command line, either through a pattern
+	 * match or by naming them explicitly, we will give the user only
+	 * those devices.
+	 */
+	if ((num_devices_specified == 0) && (num_matches == 0)) {
+		if (devstat_buildmatch(da, &matches, &num_matches) != 0)
+			xo_errx(1, "%s", devstat_errbuf);
+
+		select_mode = DS_SELECT_ADD;
+	} else
+		select_mode = DS_SELECT_ONLY;
+
+	/*
+	 * At this point, selectdevs will almost surely indicate that the
+	 * device list has changed, so we don't look for return values of 0
+	 * or 1.  If we get back -1, though, there is an error.
+	 */
+	if (devstat_selectdevs(&dev_select, &num_selected, &num_selections,
+		       &select_generation, generation, cur.dinfo->devices,
+		       num_devices, matches, num_matches, specified_devices,
+		       num_devices_specified, select_mode,
+		       maxshowdevs, 0) == -1)
+		xo_errx(1, "%s", devstat_errbuf);
+
+	return(argv);
+}
+
+/* Return system uptime in nanoseconds */
+static long long
+getuptime(void)
+{
+	struct timespec sp;
+
+	(void)clock_gettime(CLOCK_UPTIME, &sp);
+
+	return((long long)sp.tv_sec * 1000000000LL + sp.tv_nsec);
+}
+
+static void
+fill_pcpu(struct pcpu ***pcpup, int* maxcpup)
+{
+	struct pcpu **pcpu;
+	
+	int maxcpu, i;
+
+	*pcpup = NULL;
+	
+	if (kd == NULL)
+		return;
+
+	maxcpu = kvm_getmaxcpu(kd);
+	if (maxcpu < 0)
+		xo_errx(1, "kvm_getmaxcpu: %s", kvm_geterr(kd));
+
+	pcpu = calloc(maxcpu, sizeof(struct pcpu *));
+	if (pcpu == NULL)
+		xo_err(1, "calloc");
+
+	for (i = 0; i < maxcpu; i++) {
+		pcpu[i] = kvm_getpcpu(kd, i);
+		if (pcpu[i] == (struct pcpu *)-1)
+			xo_errx(1, "kvm_getpcpu: %s", kvm_geterr(kd));
+	}
+
+	*maxcpup = maxcpu;
+	*pcpup = pcpu;
+}
+
+static void
+free_pcpu(struct pcpu **pcpu, int maxcpu)
+{
+	int i;
+
+	for (i = 0; i < maxcpu; i++)
+		free(pcpu[i]);
+	free(pcpu);
+}
+
+static void
+fill_vmmeter(struct vmmeter *vmmp)
+{
+	struct pcpu **pcpu;
+	int maxcpu, i;
+
+	if (kd != NULL) {
+		kread(X_SUM, vmmp, sizeof(*vmmp));
+		fill_pcpu(&pcpu, &maxcpu);
+		for (i = 0; i < maxcpu; i++) {
+			if (pcpu[i] == NULL)
+				continue;
+#define ADD_FROM_PCPU(i, name) \
+			vmmp->name += pcpu[i]->pc_cnt.name
+			ADD_FROM_PCPU(i, v_swtch);
+			ADD_FROM_PCPU(i, v_trap);
+			ADD_FROM_PCPU(i, v_syscall);
+			ADD_FROM_PCPU(i, v_intr);
+			ADD_FROM_PCPU(i, v_soft);
+			ADD_FROM_PCPU(i, v_vm_faults);
+			ADD_FROM_PCPU(i, v_io_faults);
+			ADD_FROM_PCPU(i, v_cow_faults);
+			ADD_FROM_PCPU(i, v_cow_optim);
+			ADD_FROM_PCPU(i, v_zfod);
+			ADD_FROM_PCPU(i, v_ozfod);
+			ADD_FROM_PCPU(i, v_swapin);
+			ADD_FROM_PCPU(i, v_swapout);
+			ADD_FROM_PCPU(i, v_swappgsin);
+			ADD_FROM_PCPU(i, v_swappgsout);
+			ADD_FROM_PCPU(i, v_vnodein);
+			ADD_FROM_PCPU(i, v_vnodeout);
+			ADD_FROM_PCPU(i, v_vnodepgsin);
+			ADD_FROM_PCPU(i, v_vnodepgsout);
+			ADD_FROM_PCPU(i, v_intrans);
+			ADD_FROM_PCPU(i, v_tfree);
+			ADD_FROM_PCPU(i, v_forks);
+			ADD_FROM_PCPU(i, v_vforks);
+			ADD_FROM_PCPU(i, v_rforks);
+			ADD_FROM_PCPU(i, v_kthreads);
+			ADD_FROM_PCPU(i, v_forkpages);
+			ADD_FROM_PCPU(i, v_vforkpages);
+			ADD_FROM_PCPU(i, v_rforkpages);
+			ADD_FROM_PCPU(i, v_kthreadpages);
+#undef ADD_FROM_PCPU
+		}
+		free_pcpu(pcpu, maxcpu);
+	} else {
+		size_t size = sizeof(unsigned int);
+#define GET_VM_STATS(cat, name) \
+	mysysctl("vm.stats." #cat "." #name, &vmmp->name, &size, NULL, 0)
+		/* sys */
+		GET_VM_STATS(sys, v_swtch);
+		GET_VM_STATS(sys, v_trap);
+		GET_VM_STATS(sys, v_syscall);
+		GET_VM_STATS(sys, v_intr);
+		GET_VM_STATS(sys, v_soft);
+
+		/* vm */
+		GET_VM_STATS(vm, v_vm_faults);
+		GET_VM_STATS(vm, v_io_faults);
+		GET_VM_STATS(vm, v_cow_faults);
+		GET_VM_STATS(vm, v_cow_optim);
+		GET_VM_STATS(vm, v_zfod);
+		GET_VM_STATS(vm, v_ozfod);
+		GET_VM_STATS(vm, v_swapin);
+		GET_VM_STATS(vm, v_swapout);
+		GET_VM_STATS(vm, v_swappgsin);
+		GET_VM_STATS(vm, v_swappgsout);
+		GET_VM_STATS(vm, v_vnodein);
+		GET_VM_STATS(vm, v_vnodeout);
+		GET_VM_STATS(vm, v_vnodepgsin);
+		GET_VM_STATS(vm, v_vnodepgsout);
+		GET_VM_STATS(vm, v_intrans);
+		GET_VM_STATS(vm, v_reactivated);
+		GET_VM_STATS(vm, v_pdwakeups);
+		GET_VM_STATS(vm, v_pdpages);
+		GET_VM_STATS(vm, v_tcached);
+		GET_VM_STATS(vm, v_dfree);
+		GET_VM_STATS(vm, v_pfree);
+		GET_VM_STATS(vm, v_tfree);
+		GET_VM_STATS(vm, v_page_size);
+		GET_VM_STATS(vm, v_page_count);
+		GET_VM_STATS(vm, v_free_reserved);
+		GET_VM_STATS(vm, v_free_target);
+		GET_VM_STATS(vm, v_free_min);
+		GET_VM_STATS(vm, v_free_count);
+		GET_VM_STATS(vm, v_wire_count);
+		GET_VM_STATS(vm, v_active_count);
+		GET_VM_STATS(vm, v_inactive_target);
+		GET_VM_STATS(vm, v_inactive_count);
+		GET_VM_STATS(vm, v_cache_count);
+		GET_VM_STATS(vm, v_pageout_free_min);
+		GET_VM_STATS(vm, v_interrupt_free_min);
+		/*GET_VM_STATS(vm, v_free_severe);*/
+		GET_VM_STATS(vm, v_forks);
+		GET_VM_STATS(vm, v_vforks);
+		GET_VM_STATS(vm, v_rforks);
+		GET_VM_STATS(vm, v_kthreads);
+		GET_VM_STATS(vm, v_forkpages);
+		GET_VM_STATS(vm, v_vforkpages);
+		GET_VM_STATS(vm, v_rforkpages);
+		GET_VM_STATS(vm, v_kthreadpages);
+#undef GET_VM_STATS
+	}
+}
+
+static void
+fill_vmtotal(struct vmtotal *vmtp)
+{
+	if (kd != NULL) {
+		/* XXX fill vmtp */
+		xo_errx(1, "not implemented");
+	} else {
+		size_t size = sizeof(*vmtp);
+		mysysctl("vm.vmtotal", vmtp, &size, NULL, 0);
+		if (size != sizeof(*vmtp))
+			xo_errx(1, "vm.total size mismatch");
+	}
+}
+
+/* Determine how many cpu columns, and what index they are in kern.cp_times */
+static int
+getcpuinfo(u_long *maskp, int *maxidp)
+{
+	int maxcpu;
+	int maxid;
+	int ncpus;
+	int i, j;
+	int empty;
+	size_t size;
+	long *times;
+	u_long mask;
+
+	if (kd != NULL)
+		xo_errx(1, "not implemented");
+	mask = 0;
+	ncpus = 0;
+	size = sizeof(maxcpu);
+	mysysctl("kern.smp.maxcpus", &maxcpu, &size, NULL, 0);
+	if (size != sizeof(maxcpu))
+		xo_errx(1, "sysctl kern.smp.maxcpus");
+	size = sizeof(long) * maxcpu * CPUSTATES;
+	times = malloc(size);
+	if (times == NULL)
+		xo_err(1, "malloc %zd bytes", size);
+	mysysctl("kern.cp_times", times, &size, NULL, 0);
+	maxid = (size / CPUSTATES / sizeof(long)) - 1;
+	for (i = 0; i <= maxid; i++) {
+		empty = 1;
+		for (j = 0; empty && j < CPUSTATES; j++) {
+			if (times[i * CPUSTATES + j] != 0)
+				empty = 0;
+		}
+		if (!empty) {
+			mask |= (1ul << i);
+			ncpus++;
+		}
+	}
+	if (maskp)
+		*maskp = mask;
+	if (maxidp)
+		*maxidp = maxid;
+	return (ncpus);
+}
+
+
+static void
+prthuman(const char *name, u_int64_t val, int size)
+{
+	char buf[10];
+	int flags;
+	char fmt[128];
+
+	snprintf(fmt, sizeof(fmt), "{:%s/%%*s}", name);
+
+	if (size < 5 || size > 9)
+		xo_errx(1, "doofus");
+	flags = HN_B | HN_NOSPACE | HN_DECIMAL;
+	humanize_number(buf, size, val, "", HN_AUTOSCALE, flags);
+	xo_attr("value", "%ju", (uintmax_t) val);
+	xo_emit(fmt, size, buf);
+}
+
+static int hz, hdrcnt;
+
+static long *cur_cp_times;
+static long *last_cp_times;
+static size_t size_cp_times;
+
+static void
+dovmstat(unsigned int interval, int reps)
+{
+	struct vmtotal total;
+	time_t uptime, halfuptime;
+	struct devinfo *tmp_dinfo;
+	size_t size;
+	int ncpus, maxid;
+	u_long cpumask;
+	int rate_adj;
+
+	uptime = getuptime() / 1000000000LL;
+	halfuptime = uptime / 2;
+	rate_adj = 1;
+	ncpus = 1;
+	maxid = 0;
+
+	/*
+	 * If the user stops the program (control-Z) and then resumes it,
+	 * print out the header again.
+	 */
+	(void)signal(SIGCONT, needhdr);
+
+	/*
+	 * If our standard output is a tty, then install a SIGWINCH handler
+	 * and set wresized so that our first iteration through the main
+	 * vmstat loop will peek at the terminal's current rows to find out
+	 * how many lines can fit in a screenful of output.
+	 */
+	if (isatty(fileno(stdout)) != 0) {
+		wresized = 1;
+		(void)signal(SIGWINCH, needresize);
+	} else {
+		wresized = 0;
+		winlines = VMSTAT_DEFAULT_LINES;
+	}
+
+	if (kd != NULL) {
+		if (namelist[X_STATHZ].n_type != 0 &&
+		    namelist[X_STATHZ].n_value != 0)
+			kread(X_STATHZ, &hz, sizeof(hz));
+		if (!hz)
+			kread(X_HZ, &hz, sizeof(hz));
+	} else {
+		struct clockinfo clockrate;
+
+		size = sizeof(clockrate);
+		mysysctl("kern.clockrate", &clockrate, &size, NULL, 0);
+		if (size != sizeof(clockrate))
+			xo_errx(1, "clockrate size mismatch");
+		hz = clockrate.hz;
+	}
+
+	if (Pflag) {
+		ncpus = getcpuinfo(&cpumask, &maxid);
+		size_cp_times = sizeof(long) * (maxid + 1) * CPUSTATES;
+		cur_cp_times = calloc(1, size_cp_times);
+		last_cp_times = calloc(1, size_cp_times);
+	}
+	for (hdrcnt = 1;;) {
+		if (!--hdrcnt)
+			printhdr(maxid, cpumask);
+		if (kd != NULL) {
+			if (kvm_getcptime(kd, cur.cp_time) < 0)
+				xo_errx(1, "kvm_getcptime: %s", kvm_geterr(kd));
+		} else {
+			size = sizeof(cur.cp_time);
+			mysysctl("kern.cp_time", &cur.cp_time, &size, NULL, 0);
+			if (size != sizeof(cur.cp_time))
+				xo_errx(1, "cp_time size mismatch");
+		}
+		if (Pflag) {
+			size = size_cp_times;
+			mysysctl("kern.cp_times", cur_cp_times, &size, NULL, 0);
+			if (size != size_cp_times)
+				xo_errx(1, "cp_times mismatch");
+		}
+
+		tmp_dinfo = last.dinfo;
+		last.dinfo = cur.dinfo;
+		cur.dinfo = tmp_dinfo;
+		last.snap_time = cur.snap_time;
+
+		/*
+		 * Here what we want to do is refresh our device stats.
+		 * getdevs() returns 1 when the device list has changed.
+		 * If the device list has changed, we want to go through
+		 * the selection process again, in case a device that we
+		 * were previously displaying has gone away.
+		 */
+		switch (devstat_getdevs(NULL, &cur)) {
+		case -1:
+			xo_errx(1, "%s", devstat_errbuf);
+			break;
+		case 1: {
+			int retval;
+
+			num_devices = cur.dinfo->numdevs;
+			generation = cur.dinfo->generation;
+
+			retval = devstat_selectdevs(&dev_select, &num_selected,
+					    &num_selections, &select_generation,
+					    generation, cur.dinfo->devices,
+					    num_devices, matches, num_matches,
+					    specified_devices,
+					    num_devices_specified, select_mode,
+					    maxshowdevs, 0);
+			switch (retval) {
+			case -1:
+				xo_errx(1, "%s", devstat_errbuf);
+				break;
+			case 1:
+				printhdr(maxid, cpumask);
+				break;
+			default:
+				break;
+			}
+		}
+		default:
+			break;
+		}
+
+		fill_vmmeter(&sum);
+		fill_vmtotal(&total);
+		xo_open_container("processes");
+		xo_emit("{:runnable/%1d} {:waiting/%ld} "
+		        "{:swapped-out/%ld}",
+		    total.t_rq - 1, total.t_dw + total.t_pw, total.t_sw);
+		xo_close_container("processes");
+		xo_open_container("memory");
+#define vmstat_pgtok(a) ((a) * (sum.v_page_size >> 10))
+#define	rate(x)	(((x) * rate_adj + halfuptime) / uptime)	/* round */
+		if (hflag) {
+			xo_emit("");
+			prthuman("available-memory",
+			         total.t_avm * (u_int64_t)sum.v_page_size, 5);
+			xo_emit(" ");
+			prthuman("free-memory",
+			         total.t_free * (u_int64_t)sum.v_page_size, 5);
+			xo_emit(" ");
+		} else {
+			xo_emit(" ");
+			xo_emit("{:available-memory/%7d}",
+			        vmstat_pgtok(total.t_avm));
+			xo_emit(" ");
+			xo_emit("{:free-memory/%7d}",
+			        vmstat_pgtok(total.t_free));
+		}
+		xo_emit("{:total-page-faults/%5lu} ",
+		        (unsigned long)rate(sum.v_vm_faults -
+		        osum.v_vm_faults));
+		xo_close_container("memory");
+
+		xo_open_container("paging-rates");
+		xo_emit("{:page-reactivated/%3lu} ",
+		    (unsigned long)rate(sum.v_reactivated - osum.v_reactivated));
+		xo_emit("{:paged-in/%3lu} ",
+		    (unsigned long)rate(sum.v_swapin + sum.v_vnodein -
+		    (osum.v_swapin + osum.v_vnodein)));
+		xo_emit("{:paged-out/%3lu} ",
+		    (unsigned long)rate(sum.v_swapout + sum.v_vnodeout -
+		    (osum.v_swapout + osum.v_vnodeout)));
+		xo_emit("{:freed/%5lu} ",
+		    (unsigned long)rate(sum.v_tfree - osum.v_tfree));
+		xo_emit("{:scanned/%4lu} ",
+		    (unsigned long)rate(sum.v_pdpages - osum.v_pdpages));
+		xo_close_container("paging-rates");
+
+		devstats();
+		xo_open_container("fault-rates");
+		xo_emit("{:interrupts/%4lu} {:system-calls/%5lu} "
+		        "{:context-switches/%5u}",
+		    (unsigned long)rate(sum.v_intr - osum.v_intr),
+		    (unsigned long)rate(sum.v_syscall - osum.v_syscall),
+		    (unsigned long)rate(sum.v_swtch - osum.v_swtch));
+		xo_close_container("fault-rates");
+		if (Pflag)
+			pcpustats(ncpus, cpumask, maxid);
+		else
+			cpustats();
+		xo_emit("\n");
+		xo_flush();
+		if (reps >= 0 && --reps <= 0)
+			break;
+		osum = sum;
+		uptime = interval;
+		rate_adj = 1000;
+		/*
+		 * We round upward to avoid losing low-frequency events
+		 * (i.e., >= 1 per interval but < 1 per millisecond).
+		 */
+		if (interval != 1)
+			halfuptime = (uptime + 1) / 2;
+		else
+			halfuptime = 0;
+		(void)usleep(interval * 1000);
+	}
+}
+
+static void
+printhdr(int maxid, u_long cpumask)
+{
+	int i, num_shown;
+
+	num_shown = MIN(num_selected, maxshowdevs);
+	if (hflag) {
+		xo_emit("{T:procs}  {T:memory}       {T:/page%*s}", 19, "");
+	} else {
+		xo_emit("{T:procs}     {T:memory}        {T:/page%*s}", 19, "");
+	}
+	if (num_shown > 1)
+		xo_emit(" {T:/disks %*s}", num_shown * 4 - 7, ""); 
+	else if (num_shown == 1)
+		xo_emit("   {T:disks}");
+	xo_emit("   {T:faults}      ");
+	if (Pflag) {
+		for (i = 0; i <= maxid; i++) {
+			if (cpumask & (1ul << i))
+				xo_emit("  {T:/cpu%d}   ", i);
+		}
+		xo_emit("\n");
+	} else
+		xo_emit("   {T:cpu}\n");
+	if (hflag) {
+		xo_emit("{T:r} {T:b} {T:w}  {T:avm}   {T:fre}   {T:flt}  {T:re}  {T:pi}  {T:po}    {T:fr}   {T:sr} ");
+	} else {
+		xo_emit("{T:r} {T:b} {T:w}     {T:avm}     {T:fre}  {T:flt}  {T:re}  {T:pi}  {T:po}    {T:fr}   {T:sr} ");
+	}
+	for (i = 0; i < num_devices; i++)
+		if ((dev_select[i].selected)
+		 && (dev_select[i].selected <= maxshowdevs))
+			xo_emit("{T:/%c%c%d} ", dev_select[i].device_name[0],
+				     dev_select[i].device_name[1],
+				     dev_select[i].unit_number);
+	xo_emit("  {T:in}    {T:sy}    {T:cs}");
+	if (Pflag) {
+		for (i = 0; i <= maxid; i++) {
+			if (cpumask & (1ul << i))
+				xo_emit(" {T:us} {T:sy} {T:id}");
+		}
+		xo_emit("\n");
+	} else
+		xo_emit(" {T:us} {T:sy} {T:id}\n");
+	if (wresized != 0)
+		doresize();
+	hdrcnt = winlines;
+}
+
+/*
+ * Force a header to be prepended to the next output.
+ */
+static void
+needhdr(int dummy __unused)
+{
+
+	hdrcnt = 1;
+}
+
+/*
+ * When the terminal is resized, force an update of the maximum number of rows
+ * printed between each header repetition.  Then force a new header to be
+ * prepended to the next output.
+ */
+void
+needresize(int signo)
+{
+
+	wresized = 1;
+	hdrcnt = 1;
+}
+
+/*
+ * Update the global `winlines' count of terminal rows.
+ */
+void
+doresize(void)
+{
+	int status;
+	struct winsize w;
+
+	for (;;) {
+		status = ioctl(fileno(stdout), TIOCGWINSZ, &w);
+		if (status == -1 && errno == EINTR)
+			continue;
+		else if (status == -1)
+			xo_err(1, "ioctl");
+		if (w.ws_row > 3)
+			winlines = w.ws_row - 3;
+		else
+			winlines = VMSTAT_DEFAULT_LINES;
+		break;
+	}
+
+	/*
+	 * Inhibit doresize() calls until we are rescheduled by SIGWINCH.
+	 */
+	wresized = 0;
+}
+
+#ifdef notyet
+static void
+dotimes(void)
+{
+	unsigned int pgintime, rectime;
+
+	kread(X_REC, &rectime, sizeof(rectime));
+	kread(X_PGIN, &pgintime, sizeof(pgintime));
+	kread(X_SUM, &sum, sizeof(sum));
+	xo_emit("{:page-reclaims/%u} {N:reclaims}, "
+		"{:reclaim-time/%u} {N:total time (usec)}\n",
+	    sum.v_pgrec, rectime);
+	xo_emit("{L:average}: {:reclaim-average/%u} {N:usec \\/ reclaim}\n",
+		rectime / sum.v_pgrec);
+	xo_emit("\n");
+	xo_emit("{:page-ins/%u} {N:page ins}, "
+		"{:page-in-time/%u} {N:total time (msec)}\n",
+	    sum.v_pgin, pgintime / 10);
+	xo_emit("{L:average}: {:average/%8.1f} {N:msec \\/ page in}\n",
+	    pgintime / (sum.v_pgin * 10.0));
+}
+#endif
+
+static long
+pct(long top, long bot)
+{
+	long ans;
+
+	if (bot == 0)
+		return(0);
+	ans = (quad_t)top * 100 / bot;
+	return (ans);
+}
+
+#define	PCT(top, bot) pct((long)(top), (long)(bot))
+
+static void
+dosum(void)
+{
+	struct nchstats lnchstats;
+	long nchtotal;
+
+	fill_vmmeter(&sum);
+	xo_open_container("summary-statistics");
+	xo_emit("{:context-switches/%9u} {N:cpu context switches}\n",
+		sum.v_swtch);
+	xo_emit("{:interrupts/%9u} {N:device interrupts}\n",
+		sum.v_intr);
+	xo_emit("{:software-interrupts/%9u} {N:software interrupts}\n",
+		sum.v_soft);
+	xo_emit("{:traps/%9u} {N:traps}\n", sum.v_trap);
+	xo_emit("{:system-calls/%9u} {N:system calls}\n",
+		sum.v_syscall);
+	xo_emit("{:kernel-threads/%9u} {N:kernel threads created}\n",
+		sum.v_kthreads);
+	xo_emit("{:forks/%9u} {N: fork() calls}\n", sum.v_forks);
+	xo_emit("{:vforks/%9u} {N:vfork() calls}\n",
+		sum.v_vforks);
+	xo_emit("{:rforks/%9u} {N:rfork() calls}\n",
+		sum.v_rforks);
+	xo_emit("{:swap-ins/%9u} {N:swap pager pageins}\n",
+		sum.v_swapin);
+	xo_emit("{:swap-in-pages/%9u} {N:swap pager pages paged in}\n",
+		sum.v_swappgsin);
+	xo_emit("{:swap-outs/%9u} {N:swap pager pageouts}\n",
+		sum.v_swapout);
+	xo_emit("{:swap-out-pages/%9u} {N:swap pager pages paged out}\n",
+		sum.v_swappgsout);
+	xo_emit("{:vnode-page-ins/%9u} {N:vnode pager pageins}\n",
+		sum.v_vnodein);
+	xo_emit("{:vnode-page-in-pages/%9u} {N:vnode pager pages paged in}\n",
+		sum.v_vnodepgsin);
+	xo_emit("{:vnode-page-outs/%9u} {N:vnode pager pageouts}\n",
+		sum.v_vnodeout);
+	xo_emit("{:vnode-page-outs/%9u} {N:vnode pager pages paged out}\n",
+		sum.v_vnodepgsout);
+	xo_emit("{:page-daemon-wakeups/%9u} {N:page daemon wakeups}\n",
+		sum.v_pdwakeups);
+	xo_emit("{:page-daemon-pages/%9u} {N:pages examined by the page daemon}\n",
+		sum.v_pdpages);
+	xo_emit("{:reactivated/%9u} {N:pages reactivated}\n",
+		sum.v_reactivated);
+	xo_emit("{:copy-on-write-faults/%9u} {N:copy-on-write faults}\n",
+		sum.v_cow_faults);
+	xo_emit("{:copy-on-write-optimized-faults/%9u} {N:copy-on-write optimized faults}\n",
+		sum.v_cow_optim);
+	xo_emit("{:zero-fill-pages/%9u} {N:zero fill pages zeroed}\n",
+		sum.v_zfod);
+	xo_emit("{:zero-fill-prezeroed/%9u} {N:zero fill pages prezeroed}\n",
+		sum.v_ozfod);
+	xo_emit("{:intransit-blocking/%9u} {N:intransit blocking page faults}\n",
+		sum.v_intrans);
+	xo_emit("{:total-faults/%9u} {N:total VM faults taken}\n",
+		sum.v_vm_faults);
+	xo_emit("{:faults-requiring-io/%9u} {N:page faults requiring I\\/O}\n",
+		sum.v_io_faults);
+	xo_emit("{:faults-from-thread-creation/%9u} {N:pages affected by kernel thread creation}\n",
+		sum.v_kthreadpages);
+	xo_emit("{:faults-from-fork/%9u} {N:pages affected by  fork}()\n",
+		sum.v_forkpages);
+	xo_emit("{:faults-from-vfork/%9u} {N:pages affected by vfork}()\n",
+		sum.v_vforkpages);
+	xo_emit("{:pages-rfork/%9u} {N:pages affected by rfork}()\n",
+		sum.v_rforkpages);
+	xo_emit("{:pages-total-cached/%9u} {N:pages cached}\n",
+		sum.v_tcached);
+	xo_emit("{:pages-freed/%9u} {N:pages freed}\n",
+		sum.v_tfree);
+	xo_emit("{:pages-freed-by-daemon/%9u} {N:pages freed by daemon}\n",
+		sum.v_dfree);
+	xo_emit("{:pages-freed-on-exit/%9u} {N:pages freed by exiting processes}\n",
+		sum.v_pfree);
+	xo_emit("{:active-pages/%9u} {N:pages active}\n",
+		sum.v_active_count);
+	xo_emit("{:inactive-pages/%9u} {N:pages inactive}\n",
+		sum.v_inactive_count);
+	xo_emit("{:vm-cache/%9u} {N:pages in VM cache}\n",
+		sum.v_cache_count);
+	xo_emit("{:wired-pages/%9u} {N:pages wired down}\n",
+		sum.v_wire_count);
+	xo_emit("{:free-pages/%9u} {N:pages free}\n",
+		sum.v_free_count);
+	xo_emit("{:bytes-per-page/%9u} {N:bytes per page}\n", sum.v_page_size);
+	if (kd != NULL) {
+		kread(X_NCHSTATS, &lnchstats, sizeof(lnchstats));
+	} else {
+		size_t size = sizeof(lnchstats);
+		mysysctl("vfs.cache.nchstats", &lnchstats, &size, NULL, 0);
+		if (size != sizeof(lnchstats))
+			xo_errx(1, "vfs.cache.nchstats size mismatch");
+	}
+	nchtotal = lnchstats.ncs_goodhits + lnchstats.ncs_neghits +
+	    lnchstats.ncs_badhits + lnchstats.ncs_falsehits +
+	    lnchstats.ncs_miss + lnchstats.ncs_long;
+	xo_emit("{:total-name-lookups/%9ld} {N:total name lookups}\n",
+	        nchtotal);
+	xo_emit("{P:/%9s} {N:cache hits} "
+	        "({:positive-cache-hits/%ld}% pos + "
+	        "{:negative-cache-hits/%ld}% {N:neg}) "
+	        "system {:cache-hit-percent/%ld}% per-directory\n",
+	    "", PCT(lnchstats.ncs_goodhits, nchtotal),
+	    PCT(lnchstats.ncs_neghits, nchtotal),
+	    PCT(lnchstats.ncs_pass2, nchtotal));
+	xo_emit("{P:/%9s} {L:deletions} {:deletions/%ld}%, "
+	        "{L:falsehits} {:false-hits/%ld}%, "
+	        "{L:toolong} {:too-long/%ld}%\n", "",
+	    PCT(lnchstats.ncs_badhits, nchtotal),
+	    PCT(lnchstats.ncs_falsehits, nchtotal),
+	    PCT(lnchstats.ncs_long, nchtotal));
+	xo_close_container("summary-statistics");
+}
+
+static void
+doforkst(void)
+{
+	fill_vmmeter(&sum);
+	xo_open_container("fork-statistics");
+	xo_emit("{:fork/%u} {N:forks}, {:fork-pages/%u} {N:pages}, "
+		"{L:average} {:fork-average/%.2f}\n",
+	    sum.v_forks, sum.v_forkpages,
+	    sum.v_forks == 0 ? 0.0 :
+	    (double)sum.v_forkpages / sum.v_forks);
+	xo_emit("{:vfork/%u} {N:vforks}, {:vfork-pages/%u} {N:pages}, "
+		"{L:average} {:vfork-average/%.2f}\n",
+	    sum.v_vforks, sum.v_vforkpages,
+	    sum.v_vforks == 0 ? 0.0 :
+	    (double)sum.v_vforkpages / sum.v_vforks);
+	xo_emit("{:rfork/%u} {N:rforks}, {:rfork-pages/%u} {N:pages}, "
+		"{L:average} {:rfork-average/%.2f}\n",
+	    sum.v_rforks, sum.v_rforkpages,
+	    sum.v_rforks == 0 ? 0.0 :
+	    (double)sum.v_rforkpages / sum.v_rforks);
+	xo_close_container("fork-statistics");
+}
+
+static void
+devstats(void)
+{
+	int dn, state;
+	long double transfers_per_second;
+	long double busy_seconds;
+	long tmp;
+
+	for (state = 0; state < CPUSTATES; ++state) {
+		tmp = cur.cp_time[state];
+		cur.cp_time[state] -= last.cp_time[state];
+		last.cp_time[state] = tmp;
+	}
+
+	busy_seconds = cur.snap_time - last.snap_time;
+
+	xo_open_list("device");
+	for (dn = 0; dn < num_devices; dn++) {
+		int di;
+
+		if ((dev_select[dn].selected == 0)
+		 || (dev_select[dn].selected > maxshowdevs))
+			continue;
+
+		di = dev_select[dn].position;
+
+		if (devstat_compute_statistics(&cur.dinfo->devices[di],
+		    &last.dinfo->devices[di], busy_seconds,
+		    DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
+		    DSM_NONE) != 0)
+			xo_errx(1, "%s", devstat_errbuf);
+
+		xo_open_instance("device");
+		xo_emit("{ekq:name/%c%c%d}{:transfers/%3.0Lf} ",
+			dev_select[dn].device_name[0],
+			dev_select[dn].device_name[1],
+			dev_select[dn].unit_number,
+			transfers_per_second);
+		xo_close_instance("device");
+	}
+	xo_close_list("device");
+}
+
+static void
+percent(const char *name, double pct, int *over)
+{
+	char buf[10];
+	char fmt[128];
+	int l;
+
+	snprintf(fmt, sizeof(fmt), " {:%s/%%*s}", name);
+	l = snprintf(buf, sizeof(buf), "%.0f", pct);
+	if (l == 1 && *over) {
+		xo_emit(fmt, 1, buf);
+		(*over)--;
+	} else
+		xo_emit(fmt, 2, buf);
+	if (l > 2)
+		(*over)++;
+}
+
+static void
+cpustats(void)
+{
+	int state, over;
+	double lpct, total;
+
+	total = 0;
+	for (state = 0; state < CPUSTATES; ++state)
+		total += cur.cp_time[state];
+	if (total)
+		lpct = 100.0 / total;
+	else
+		lpct = 0.0;
+	over = 0;
+	xo_open_container("cpu-statistics");
+	percent("user", (cur.cp_time[CP_USER] + cur.cp_time[CP_NICE]) * lpct, &over);
+	percent("system", (cur.cp_time[CP_SYS] + cur.cp_time[CP_INTR]) * lpct, &over);
+	percent("idle", cur.cp_time[CP_IDLE] * lpct, &over);
+	xo_close_container("cpu-statistics");
+}
+
+static void
+pcpustats(int ncpus, u_long cpumask, int maxid)
+{
+	int state, i;
+	double lpct, total;
+	long tmp;
+	int over;
+
+	/* devstats does this for cp_time */
+	for (i = 0; i <= maxid; i++) {
+		if ((cpumask & (1ul << i)) == 0)
+			continue;
+		for (state = 0; state < CPUSTATES; ++state) {
+			tmp = cur_cp_times[i * CPUSTATES + state];
+			cur_cp_times[i * CPUSTATES + state] -= last_cp_times[i *
+			    CPUSTATES + state];
+			last_cp_times[i * CPUSTATES + state] = tmp;
+		}
+	}
+
+	over = 0;
+	xo_open_list("cpu");
+	for (i = 0; i <= maxid; i++) {
+		if ((cpumask & (1ul << i)) == 0)
+			continue;
+		xo_open_instance("cpu");
+		xo_emit("{ke:name/%d}", i);
+		total = 0;
+		for (state = 0; state < CPUSTATES; ++state)
+			total += cur_cp_times[i * CPUSTATES + state];
+		if (total)
+			lpct = 100.0 / total;
+		else
+			lpct = 0.0;
+		percent("user", (cur_cp_times[i * CPUSTATES + CP_USER] +
+			 cur_cp_times[i * CPUSTATES + CP_NICE]) * lpct, &over);
+		percent("system", (cur_cp_times[i * CPUSTATES + CP_SYS] +
+			 cur_cp_times[i * CPUSTATES + CP_INTR]) * lpct, &over);
+		percent("idle", cur_cp_times[i * CPUSTATES + CP_IDLE] * lpct,
+			&over);
+		xo_close_instance("cpu");
+	}
+	xo_close_list("cpu");
+}
+
+static unsigned int
+read_intrcnts(unsigned long **intrcnts)
+{
+	size_t intrcntlen;
+
+	if (kd != NULL) {
+		kread(X_SINTRCNT, &intrcntlen, sizeof(intrcntlen));
+		if ((*intrcnts = malloc(intrcntlen)) == NULL)
+			err(1, "malloc()");
+		kread(X_INTRCNT, *intrcnts, intrcntlen);
+	} else {
+		for (*intrcnts = NULL, intrcntlen = 1024; ; intrcntlen *= 2) {
+			*intrcnts = reallocf(*intrcnts, intrcntlen);
+			if (*intrcnts == NULL)
+				err(1, "reallocf()");
+			if (mysysctl("hw.intrcnt",
+			    *intrcnts, &intrcntlen, NULL, 0) == 0)
+				break;
+		}
+	}
+
+	return (intrcntlen / sizeof(unsigned long));
+}
+
+static void
+print_intrcnts(unsigned long *intrcnts, unsigned long *old_intrcnts,
+		char *intrnames, unsigned int nintr,
+		size_t istrnamlen, long long period_ms)
+{
+	unsigned long *intrcnt, *old_intrcnt;
+	uint64_t inttotal, old_inttotal, total_count, total_rate;
+	char* intrname;
+	unsigned int i;
+
+	inttotal = 0;
+	old_inttotal = 0;
+	intrname = intrnames;
+	xo_open_list("interrupt");
+	for (i = 0, intrcnt=intrcnts, old_intrcnt=old_intrcnts; i < nintr; i++) {
+		if (intrname[0] != '\0' && (*intrcnt != 0 || aflag)) {
+			unsigned long count, rate;
+
+			count = *intrcnt - *old_intrcnt;
+			rate = (count * 1000 + period_ms / 2) / period_ms;
+			xo_open_instance("interrupt");
+			xo_emit("{d:name/%-*s}{ket:name/%s} "
+			    "{:total/%20lu} {:rate/%10lu}\n",
+			    (int)istrnamlen, intrname,
+			    intrname, count, rate);
+			xo_close_instance("interrupt");
+		}
+		intrname += strlen(intrname) + 1;
+		inttotal += *intrcnt++;
+		old_inttotal += *old_intrcnt++;
+	}
+	total_count = inttotal - old_inttotal;
+	total_rate = (total_count * 1000 + period_ms / 2) / period_ms;
+	xo_close_list("interrupt");
+	xo_emit("{L:/%-*s} {:total-interrupts/%20" PRIu64 "} "
+	        "{:total-rate/%10" PRIu64 "}\n", (int)istrnamlen,
+	        "Total", total_count, total_rate);
+}
+
+static void
+dointr(unsigned int interval, int reps)
+{
+	unsigned long *intrcnts;
+	long long uptime, period_ms;
+	unsigned long *old_intrcnts = NULL;
+	size_t clen, inamlen, istrnamlen;
+	char *intrnames, *intrname;
+
+	uptime = getuptime();
+
+	/* Get the names of each interrupt source */
+	if (kd != NULL) {
+		kread(X_SINTRNAMES, &inamlen, sizeof(inamlen));
+		if ((intrnames = malloc(inamlen)) == NULL)
+			xo_err(1, "malloc()");
+		kread(X_INTRNAMES, intrnames, inamlen);
+	} else {
+		for (intrnames = NULL, inamlen = 1024; ; inamlen *= 2) {
+			if ((intrnames = reallocf(intrnames, inamlen)) == NULL)
+				xo_err(1, "reallocf()");
+			if (mysysctl("hw.intrnames",
+			    intrnames, &inamlen, NULL, 0) == 0)
+				break;
+		}
+	}
+
+	/* Determine the length of the longest interrupt name */
+	intrname = intrnames;
+	istrnamlen = strlen("interrupt");
+	while(*intrname != '\0') {
+		clen = strlen(intrname);
+		if (clen > istrnamlen)
+			istrnamlen = clen;
+		intrname += strlen(intrname) + 1;
+	}
+	xo_emit("{T:/%-*s} {T:/%20s} {T:/%10s}\n",
+	        (int)istrnamlen, "interrupt", "total", "rate");
+
+	/* 
+	 * Loop reps times printing differential interrupt counts.  If reps is
+	 * zero, then run just once, printing total counts
+	 */
+	xo_open_container("interrupt-statistics");
+
+	period_ms = uptime / 1000000;
+	while(1) {
+		unsigned int nintr;
+		long long old_uptime;
+
+		nintr = read_intrcnts(&intrcnts);
+		/* 
+		 * Initialize old_intrcnts to 0 for the first pass, so
+		 * print_intrcnts will print total interrupts since boot
+		 */
+		if (old_intrcnts == NULL) {
+			old_intrcnts = calloc(nintr, sizeof(unsigned long));
+			if (old_intrcnts == NULL)
+				xo_err(1, "calloc()");
+		}
+
+		print_intrcnts(intrcnts, old_intrcnts, intrnames, nintr,
+		    istrnamlen, period_ms);
+		xo_flush();
+
+		free(old_intrcnts);
+		old_intrcnts = intrcnts;
+		if (reps >= 0 && --reps <= 0)
+			break;
+		usleep(interval * 1000);
+		old_uptime = uptime;
+		uptime = getuptime();
+		period_ms = (uptime - old_uptime) / 1000000;
+	}
+
+	xo_close_container("interrupt-statistics");
+}
+
+static void
+domemstat_malloc(void)
+{
+	struct memory_type_list *mtlp;
+	struct memory_type *mtp;
+	int error, first, i;
+
+	mtlp = memstat_mtl_alloc();
+	if (mtlp == NULL) {
+		xo_warn("memstat_mtl_alloc");
+		return;
+	}
+	if (kd == NULL) {
+		if (memstat_sysctl_malloc(mtlp, 0) < 0) {
+			xo_warnx("memstat_sysctl_malloc: %s",
+			    memstat_strerror(memstat_mtl_geterror(mtlp)));
+			return;
+		}
+	} else {
+		if (memstat_kvm_malloc(mtlp, kd) < 0) {
+			error = memstat_mtl_geterror(mtlp);
+			if (error == MEMSTAT_ERROR_KVM)
+				xo_warnx("memstat_kvm_malloc: %s",
+				    kvm_geterr(kd));
+			else
+				xo_warnx("memstat_kvm_malloc: %s",
+				    memstat_strerror(error));
+		}
+	}
+	xo_open_container("malloc-statistics");
+	xo_emit("{T:/%13s} {T:/%5s} {T:/%6s} {T:/%7s} {T:/%8s}  {T:Size(s)}\n",
+		"Type", "InUse", "MemUse", "HighUse", "Requests");
+	xo_open_list("memory");
+	for (mtp = memstat_mtl_first(mtlp); mtp != NULL;
+	    mtp = memstat_mtl_next(mtp)) {
+		if (memstat_get_numallocs(mtp) == 0 &&
+		    memstat_get_count(mtp) == 0)
+			continue;
+		xo_open_instance("memory");
+		xo_emit("{k:type/%13s/%s} {:in-use/%5" PRIu64 "} "
+			"{:memory-use/%5" PRIu64 "}{U:K} {:high-use/%7s} "
+			"{:requests/%8" PRIu64 "}  ",
+		    memstat_get_name(mtp), memstat_get_count(mtp),
+		    (memstat_get_bytes(mtp) + 1023) / 1024, "-",
+		    memstat_get_numallocs(mtp));
+		first = 1;
+		xo_open_list("size");
+		for (i = 0; i < 32; i++) {
+			if (memstat_get_sizemask(mtp) & (1 << i)) {
+				if (!first)
+					xo_emit(",");
+				xo_emit("{l:size/%d}", 1 << (i + 4));
+				first = 0;
+			}
+		}
+		xo_close_list("size");
+		xo_close_instance("memory");
+		xo_emit("\n");
+	}
+	xo_close_list("memory");
+	xo_close_container("malloc-statistics");
+	memstat_mtl_free(mtlp);
+}
+
+static void
+domemstat_zone(void)
+{
+	struct memory_type_list *mtlp;
+	struct memory_type *mtp;
+	char name[MEMTYPE_MAXNAME + 1];
+	int error;
+
+	mtlp = memstat_mtl_alloc();
+	if (mtlp == NULL) {
+		xo_warn("memstat_mtl_alloc");
+		return;
+	}
+	if (kd == NULL) {
+		if (memstat_sysctl_uma(mtlp, 0) < 0) {
+			xo_warnx("memstat_sysctl_uma: %s",
+			    memstat_strerror(memstat_mtl_geterror(mtlp)));
+			return;
+		}
+	} else {
+		if (memstat_kvm_uma(mtlp, kd) < 0) {
+			error = memstat_mtl_geterror(mtlp);
+			if (error == MEMSTAT_ERROR_KVM)
+				xo_warnx("memstat_kvm_uma: %s",
+				    kvm_geterr(kd));
+			else
+				xo_warnx("memstat_kvm_uma: %s",
+				    memstat_strerror(error));
+		}
+	}
+	xo_open_container("memory-zone-statistics");
+	xo_emit("{T:/%-20s} {T:/%6s} {T:/%6s} {T:/%8s} {T:/%8s} {T:/%8s} "
+		"{T:/%4s} {T:/%4s}\n\n", "ITEM", "SIZE",
+		"LIMIT", "USED", "FREE", "REQ", "FAIL", "SLEEP");
+	xo_open_list("zone");
+	for (mtp = memstat_mtl_first(mtlp); mtp != NULL;
+	    mtp = memstat_mtl_next(mtp)) {
+		strlcpy(name, memstat_get_name(mtp), MEMTYPE_MAXNAME);
+		strcat(name, ":");
+		xo_open_instance("zone");
+		xo_emit("{d:name/%-20s}{ke:name/%s} {:size/%6" PRIu64 "}, "
+			"{:limit/%6" PRIu64 "},{:used/%8" PRIu64 "},"
+			"{:free/%8" PRIu64 "},{:requests/%8" PRIu64 "},"
+			"{:fail/%4" PRIu64 "},{:sleep/%4" PRIu64 "}\n", name,
+			memstat_get_name(mtp),
+			memstat_get_size(mtp), memstat_get_countlimit(mtp),
+			memstat_get_count(mtp), memstat_get_free(mtp),
+			memstat_get_numallocs(mtp), memstat_get_failures(mtp),
+			memstat_get_sleeps(mtp));
+		xo_close_instance("zone");
+	}
+	memstat_mtl_free(mtlp);
+	xo_close_list("zone");
+	xo_close_container("memory-zone-statistics");
+	xo_emit("\n");
+}
+
+static void
+display_object(struct kinfo_vmobject *kvo)
+{
+	const char *str;
+
+	xo_open_instance("object");
+        xo_emit("{:resident/%5jd} ", (uintmax_t)kvo->kvo_resident);
+	xo_emit("{:active/%5jd} ", (uintmax_t)kvo->kvo_active);
+	xo_emit("{:inactive/%5jd} ", (uintmax_t)kvo->kvo_inactive);
+	xo_emit("{:refcount/%3d} ", kvo->kvo_ref_count);
+	xo_emit("{:shadowcount/%3d} ", kvo->kvo_shadow_count);
+	switch (kvo->kvo_memattr) {
+#ifdef VM_MEMATTR_UNCACHEABLE
+	case VM_MEMATTR_UNCACHEABLE:
+		str = "UC";
+		break;
+#endif
+#ifdef VM_MEMATTR_WRITE_COMBINING
+	case VM_MEMATTR_WRITE_COMBINING:
+		str = "WC";
+		break;
+#endif
+#ifdef VM_MEMATTR_WRITE_THROUGH
+	case VM_MEMATTR_WRITE_THROUGH:
+		str = "WT";
+		break;
+#endif
+#ifdef VM_MEMATTR_WRITE_PROTECTED
+	case VM_MEMATTR_WRITE_PROTECTED:
+		str = "WP";
+		break;
+#endif
+#ifdef VM_MEMATTR_WRITE_BACK
+	case VM_MEMATTR_WRITE_BACK:
+		str = "WB";
+		break;
+#endif
+#ifdef VM_MEMATTR_WEAK_UNCACHEABLE
+	case VM_MEMATTR_WEAK_UNCACHEABLE:
+		str = "UC-";
+		break;
+#endif
+#ifdef VM_MEMATTR_WB_WA
+	case VM_MEMATTR_WB_WA:
+		str = "WB";
+		break;
+#endif
+#ifdef VM_MEMATTR_NOCACHE
+	case VM_MEMATTR_NOCACHE:
+		str = "NC";
+		break;
+#endif
+#ifdef VM_MEMATTR_DEVICE
+	case VM_MEMATTR_DEVICE:
+		str = "DEV";
+		break;
+#endif
+#ifdef VM_MEMATTR_CACHEABLE
+	case VM_MEMATTR_CACHEABLE:
+		str = "C";
+		break;
+#endif
+#ifdef VM_MEMATTR_PREFETCHABLE
+	case VM_MEMATTR_PREFETCHABLE:
+		str = "PRE";
+		break;
+#endif
+	default:
+		str = "??";
+		break;
+	}
+	xo_emit("{:attribute/%-3s} ", str);
+	switch (kvo->kvo_type) {
+	case KVME_TYPE_NONE:
+		str = "--";
+		break;
+	case KVME_TYPE_DEFAULT:
+		str = "df";
+		break;
+	case KVME_TYPE_VNODE:
+		str = "vn";
+		break;
+	case KVME_TYPE_SWAP:
+		str = "sw";
+		break;
+	case KVME_TYPE_DEVICE:
+		str = "dv";
+		break;
+	case KVME_TYPE_PHYS:
+		str = "ph";
+		break;
+	case KVME_TYPE_DEAD:
+		str = "dd";
+		break;
+	case KVME_TYPE_SG:
+		str = "sg";
+		break;
+	case KVME_TYPE_UNKNOWN:
+	default:
+		str = "??";
+		break;
+	}
+	xo_emit("{:type/%-2s} ", str);
+	xo_emit("{:path/%-s}\n", kvo->kvo_path);
+	xo_close_instance("object");
+}
+
+static void
+doobjstat(void)
+{
+	struct kinfo_vmobject *kvo;
+	int cnt, i;
+
+	kvo = kinfo_getvmobject(&cnt);
+	if (kvo == NULL) {
+		xo_warn("Failed to fetch VM object list");
+		return;
+	}
+	xo_emit("{T:RES/%5s} {T:ACT/%5s} {T:INACT/%5s} {T:REF/%3s} {T:SHD/%3s} "
+	        "{T:CM/%3s} {T:TP/%2s} {T:PATH/%s}\n");
+	xo_open_list("object");
+	for (i = 0; i < cnt; i++)
+		display_object(&kvo[i]);
+	free(kvo);
+	xo_close_list("object");
+}
+
+/*
+ * kread reads something from the kernel, given its nlist index.
+ */
+static void
+kreado(int nlx, void *addr, size_t size, size_t offset)
+{
+	const char *sym;
+
+	if (namelist[nlx].n_type == 0 || namelist[nlx].n_value == 0) {
+		sym = namelist[nlx].n_name;
+		if (*sym == '_')
+			++sym;
+		xo_errx(1, "symbol %s not defined", sym);
+	}
+	if ((size_t)kvm_read(kd, namelist[nlx].n_value + offset, addr,
+	    size) != size) {
+		sym = namelist[nlx].n_name;
+		if (*sym == '_')
+			++sym;
+		xo_errx(1, "%s: %s", sym, kvm_geterr(kd));
+	}
+}
+
+static void
+kread(int nlx, void *addr, size_t size)
+{
+	kreado(nlx, addr, size, 0);
+}
+
+static char *
+kgetstr(const char *strp)
+{
+	int n = 0, size = 1;
+	char *ret = NULL;
+
+	do {
+		if (size == n + 1) {
+			ret = realloc(ret, size);
+			if (ret == NULL)
+				xo_err(1, "%s: realloc", __func__);
+			size *= 2;
+		}
+		if (kvm_read(kd, (u_long)strp + n, &ret[n], 1) != 1)
+			xo_errx(1, "%s: %s", __func__, kvm_geterr(kd));
+	} while (ret[n++] != '\0');
+	return (ret);
+}
+
+static void
+usage(void)
+{
+	xo_error("%s%s",
+		"usage: vmstat [-afHhimoPsz] [-M core [-N system]] [-c count] [-n devs]\n",
+		"              [-p type,if,pass] [-w wait] [disks] [wait [count]]\n");
+	xo_finish();
+	exit(1);
+}



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