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freebsd-skq/usr.sbin/iostat/iostat.c
Alan Somers da61e79c42 When iostat(8) receives SIGINT while running with "-w" or "-c", it will now 
print statistics one more time before exiting. Also, it now implements the
wait using setitimer instead of sleep, so the waits will be more consistent
when the system is heavily loaded.

MFC after:	4 weeks
Sponsored by:	Spectra Logic Corp
Differential Revision:	https://reviews.freebsd.org/D4473
2015-12-09 18:07:26 +00:00

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/*
* Copyright (c) 1997, 1998, 2000, 2001 Kenneth D. Merry
* 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.
* 3. The name of the author may not 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.
*
* $FreeBSD$
*/
/*
* Parts of this program are derived from the original FreeBSD iostat
* program:
*/
/*-
* Copyright (c) 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.
*/
/*
* Ideas for the new iostat statistics output modes taken from the NetBSD
* version of iostat:
*/
/*
* Copyright (c) 1996 John M. Vinopal
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project
* by John M. Vinopal.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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/param.h>
#include <sys/errno.h>
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <ctype.h>
#include <devstat.h>
#include <err.h>
#include <fcntl.h>
#include <inttypes.h>
#include <kvm.h>
#include <limits.h>
#include <math.h>
#include <nlist.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
struct nlist namelist[] = {
#define X_TTY_NIN 0
{ "_tty_nin" },
#define X_TTY_NOUT 1
{ "_tty_nout" },
#define X_BOOTTIME 2
{ "_boottime" },
#define X_END 2
{ NULL },
};
#define IOSTAT_DEFAULT_ROWS 20 /* Traditional default `wrows' */
struct statinfo cur, last;
int num_devices;
struct device_selection *dev_select;
int maxshowdevs;
volatile sig_atomic_t headercount;
volatile sig_atomic_t wresized; /* Tty resized, when non-zero. */
volatile sig_atomic_t alarm_rang;
volatile sig_atomic_t return_requested;
unsigned short wrows; /* Current number of tty rows. */
int dflag = 0, Iflag = 0, Cflag = 0, Tflag = 0, oflag = 0, Kflag = 0;
int xflag = 0, zflag = 0;
/* local function declarations */
static void usage(void);
static void needhdr(int signo);
static void needresize(int signo);
static void needreturn(int signo);
static void alarm_clock(int signo);
static void doresize(void);
static void phdr(void);
static void devstats(int perf_select, long double etime, int havelast);
static void cpustats(void);
static int readvar(kvm_t *kd, const char *name, int nlid, void *ptr,
size_t len);
static void
usage(void)
{
/*
* We also support the following 'traditional' syntax:
* iostat [drives] [wait [count]]
* This isn't mentioned in the man page, or the usage statement,
* but it is supported.
*/
fprintf(stderr, "usage: iostat [-CdhIKoTxz?] [-c count] [-M core]"
" [-n devs] [-N system]\n"
"\t [-t type,if,pass] [-w wait] [drives]\n");
}
int
main(int argc, char **argv)
{
int c, i;
int tflag = 0, hflag = 0, cflag = 0, wflag = 0, nflag = 0;
int count = 0, waittime = 0;
char *memf = NULL, *nlistf = NULL;
struct devstat_match *matches;
struct itimerval alarmspec;
int num_matches = 0;
char errbuf[_POSIX2_LINE_MAX];
kvm_t *kd = NULL;
long generation;
int num_devices_specified;
int num_selected, num_selections;
long select_generation;
char **specified_devices;
devstat_select_mode select_mode;
float f;
int havelast = 0;
matches = NULL;
maxshowdevs = 3;
while ((c = getopt(argc, argv, "c:CdhIKM:n:N:ot:Tw:xz?")) != -1) {
switch(c) {
case 'c':
cflag++;
count = atoi(optarg);
if (count < 1)
errx(1, "count %d is < 1", count);
break;
case 'C':
Cflag++;
break;
case 'd':
dflag++;
break;
case 'h':
hflag++;
break;
case 'I':
Iflag++;
break;
case 'K':
Kflag++;
break;
case 'M':
memf = optarg;
break;
case 'n':
nflag++;
maxshowdevs = atoi(optarg);
if (maxshowdevs < 0)
errx(1, "number of devices %d is < 0",
maxshowdevs);
break;
case 'N':
nlistf = optarg;
break;
case 'o':
oflag++;
break;
case 't':
tflag++;
if (devstat_buildmatch(optarg, &matches,
&num_matches) != 0)
errx(1, "%s", devstat_errbuf);
break;
case 'T':
Tflag++;
break;
case 'w':
wflag++;
f = atof(optarg);
waittime = f * 1000;
if (waittime < 1)
errx(1, "wait time is < 1ms");
break;
case 'x':
xflag++;
break;
case 'z':
zflag++;
break;
default:
usage();
exit(1);
break;
}
}
argc -= optind;
argv += optind;
if (nlistf != NULL || memf != NULL) {
kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf);
if (kd == NULL)
errx(1, "kvm_openfiles: %s", errbuf);
if (kvm_nlist(kd, namelist) == -1)
errx(1, "kvm_nlist: %s", kvm_geterr(kd));
}
/*
* 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(kd) < 0)
errx(1, "%s", devstat_errbuf);
/*
* Make sure Tflag and/or Cflag are set if dflag == 0. If dflag is
* greater than 0, they may be 0 or non-zero.
*/
if (dflag == 0 && xflag == 0) {
Cflag = 1;
Tflag = 1;
}
/* find out how many devices we have */
if ((num_devices = devstat_getnumdevs(kd)) < 0)
err(1, "can't get number of devices");
/*
* Figure out how many devices we should display.
*/
if (nflag == 0) {
if (xflag > 0)
maxshowdevs = num_devices;
else if (oflag > 0) {
if ((dflag > 0) && (Cflag == 0) && (Tflag == 0))
maxshowdevs = 5;
else if ((dflag > 0) && (Tflag > 0) && (Cflag == 0))
maxshowdevs = 5;
else
maxshowdevs = 4;
} else {
if ((dflag > 0) && (Cflag == 0))
maxshowdevs = 4;
else
maxshowdevs = 3;
}
}
cur.dinfo = (struct devinfo *)calloc(1, sizeof(struct devinfo));
if (cur.dinfo == NULL)
err(1, "calloc failed");
last.dinfo = (struct devinfo *)calloc(1, sizeof(struct devinfo));
if (last.dinfo == NULL)
err(1, "calloc failed");
/*
* Grab all the devices. We don't look to see if the list has
* changed here, since it almost certainly has. We only look for
* errors.
*/
if (devstat_getdevs(kd, &cur) == -1)
errx(1, "%s", devstat_errbuf);
num_devices = cur.dinfo->numdevs;
generation = cur.dinfo->generation;
/*
* If the user specified any devices on the command line, see if
* they are in the list of devices we have now.
*/
specified_devices = (char **)malloc(sizeof(char *));
if (specified_devices == NULL)
err(1, "malloc failed");
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);
if (specified_devices == NULL)
err(1, "realloc failed");
specified_devices[num_devices_specified - 1] = *argv;
}
if (nflag == 0 && maxshowdevs < num_devices_specified)
maxshowdevs = num_devices_specified;
dev_select = NULL;
if ((num_devices_specified == 0) && (num_matches == 0))
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,
hflag) == -1)
errx(1, "%s", devstat_errbuf);
/*
* Look for the traditional wait time and count arguments.
*/
if (*argv) {
f = atof(*argv);
waittime = f * 1000;
/* Let the user know he goofed, but keep going anyway */
if (wflag != 0)
warnx("discarding previous wait interval, using"
" %g instead", waittime / 1000.0);
wflag++;
if (*++argv) {
count = atoi(*argv);
if (cflag != 0)
warnx("discarding previous count, using %d"
" instead", count);
cflag++;
} else
count = -1;
}
/*
* If the user specified a count, but not an interval, we default
* to an interval of 1 second.
*/
if ((wflag == 0) && (cflag > 0))
waittime = 1 * 1000;
/*
* If the user specified a wait time, but not a count, we want to
* go on ad infinitum. This can be redundant if the user uses the
* traditional method of specifying the wait, since in that case we
* already set count = -1 above. Oh well.
*/
if ((wflag > 0) && (cflag == 0))
count = -1;
bzero(cur.cp_time, sizeof(cur.cp_time));
cur.tk_nout = 0;
cur.tk_nin = 0;
/*
* Set the snap time to the system boot time (ie: zero), so the
* stats are calculated since system boot.
*/
cur.snap_time = 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
* iostat 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;
wrows = IOSTAT_DEFAULT_ROWS;
}
/*
* Register a SIGINT handler so that we can print out final statistics
* when we get that signal
*/
(void)signal(SIGINT, needreturn);
/*
* Register a SIGALRM handler to implement sleeps if the user uses the
* -c or -w options
*/
(void)signal(SIGALRM, alarm_clock);
alarmspec.it_interval.tv_sec = waittime / 1000;
alarmspec.it_interval.tv_usec = 1000 * (waittime % 1000);
alarmspec.it_value.tv_sec = waittime / 1000;
alarmspec.it_value.tv_usec = 1000 * (waittime % 1000);
setitimer(ITIMER_REAL, &alarmspec, NULL);
for (headercount = 1;;) {
struct devinfo *tmp_dinfo;
long tmp;
long double etime;
sigset_t sigmask, oldsigmask;
if (Tflag > 0) {
if ((readvar(kd, "kern.tty_nin", X_TTY_NIN, &cur.tk_nin,
sizeof(cur.tk_nin)) != 0)
|| (readvar(kd, "kern.tty_nout", X_TTY_NOUT,
&cur.tk_nout, sizeof(cur.tk_nout))!= 0)) {
Tflag = 0;
warnx("disabling TTY statistics");
}
}
if (Cflag > 0) {
if (kd == NULL) {
if (readvar(kd, "kern.cp_time", 0,
&cur.cp_time, sizeof(cur.cp_time)) != 0)
Cflag = 0;
} else {
if (kvm_getcptime(kd, cur.cp_time) < 0) {
warnx("kvm_getcptime: %s",
kvm_geterr(kd));
Cflag = 0;
}
}
if (Cflag == 0)
warnx("disabling CPU time statistics");
}
if (!--headercount) {
phdr();
if (wresized != 0)
doresize();
headercount = wrows;
}
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.
* devstat_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(kd, &cur)) {
case -1:
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,
hflag);
switch(retval) {
case -1:
errx(1, "%s", devstat_errbuf);
break;
case 1:
phdr();
if (wresized != 0)
doresize();
headercount = wrows;
break;
default:
break;
}
break;
}
default:
break;
}
/*
* We only want to re-select devices if we're in 'top'
* mode. This is the only mode where the devices selected
* could actually change.
*/
if (hflag > 0) {
int retval;
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,
hflag);
switch(retval) {
case -1:
errx(1,"%s", devstat_errbuf);
break;
case 1:
phdr();
if (wresized != 0)
doresize();
headercount = wrows;
break;
default:
break;
}
}
if (Tflag > 0) {
tmp = cur.tk_nin;
cur.tk_nin -= last.tk_nin;
last.tk_nin = tmp;
tmp = cur.tk_nout;
cur.tk_nout -= last.tk_nout;
last.tk_nout = tmp;
}
etime = cur.snap_time - last.snap_time;
if (etime == 0.0)
etime = 1.0;
for (i = 0; i < CPUSTATES; i++) {
tmp = cur.cp_time[i];
cur.cp_time[i] -= last.cp_time[i];
last.cp_time[i] = tmp;
}
if (xflag == 0 && Tflag > 0)
printf("%4.0Lf %5.0Lf", cur.tk_nin / etime,
cur.tk_nout / etime);
devstats(hflag, etime, havelast);
if (xflag == 0) {
if (Cflag > 0)
cpustats();
printf("\n");
}
fflush(stdout);
if ((count >= 0 && --count <= 0) || return_requested)
break;
/*
* Use sigsuspend to safely sleep until either signal is
* received
*/
alarm_rang = 0;
sigemptyset(&sigmask);
sigaddset(&sigmask, SIGINT);
sigaddset(&sigmask, SIGALRM);
sigprocmask(SIG_BLOCK, &sigmask, &oldsigmask);
while (! (alarm_rang || return_requested) ) {
sigsuspend(&oldsigmask);
}
sigprocmask(SIG_UNBLOCK, &sigmask, NULL);
havelast = 1;
}
exit(0);
}
/*
* Force a header to be prepended to the next output.
*/
void
needhdr(int signo)
{
headercount = 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;
headercount = 1;
}
/*
* Record the alarm so the main loop can break its sleep
*/
void
alarm_clock(int signo)
{
alarm_rang = 1;
}
/*
* Request that the main loop exit soon
*/
void
needreturn(int signo)
{
return_requested = 1;
}
/*
* Update the global `wrows' 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)
err(1, "ioctl");
if (w.ws_row > 3)
wrows = w.ws_row - 3;
else
wrows = IOSTAT_DEFAULT_ROWS;
break;
}
/*
* Inhibit doresize() calls until we are rescheduled by SIGWINCH.
*/
wresized = 0;
}
static void
phdr(void)
{
int i, printed;
char devbuf[256];
/*
* If xflag is set, we need a per-loop header, not a page header, so
* just return. We'll print the header in devstats().
*/
if (xflag > 0)
return;
if (Tflag > 0)
(void)printf(" tty");
for (i = 0, printed=0;(i < num_devices) && (printed < maxshowdevs);i++){
int di;
if ((dev_select[i].selected != 0)
&& (dev_select[i].selected <= maxshowdevs)) {
di = dev_select[i].position;
snprintf(devbuf, sizeof(devbuf), "%s%d",
cur.dinfo->devices[di].device_name,
cur.dinfo->devices[di].unit_number);
if (oflag > 0)
(void)printf("%13.6s ", devbuf);
else
printf("%16.6s ", devbuf);
printed++;
}
}
if (Cflag > 0)
(void)printf(" cpu\n");
else
(void)printf("\n");
if (Tflag > 0)
(void)printf(" tin tout");
for (i=0, printed = 0;(i < num_devices) && (printed < maxshowdevs);i++){
if ((dev_select[i].selected != 0)
&& (dev_select[i].selected <= maxshowdevs)) {
if (oflag > 0) {
if (Iflag == 0)
(void)printf(" sps tps msps ");
else
(void)printf(" blk xfr msps ");
} else {
if (Iflag == 0)
printf(" KB/t tps MB/s ");
else
printf(" KB/t xfrs MB ");
}
printed++;
}
}
if (Cflag > 0)
(void)printf(" us ni sy in id\n");
else
printf("\n");
}
static void
devstats(int perf_select, long double etime, int havelast)
{
int dn;
long double transfers_per_second, transfers_per_second_read;
long double transfers_per_second_write;
long double kb_per_transfer, mb_per_second, mb_per_second_read;
long double mb_per_second_write;
u_int64_t total_bytes, total_transfers, total_blocks;
u_int64_t total_bytes_read, total_transfers_read;
u_int64_t total_bytes_write, total_transfers_write;
long double busy_pct, busy_time;
u_int64_t queue_len;
long double total_mb, blocks_per_second, total_duration;
long double ms_per_other, ms_per_read, ms_per_write, ms_per_transaction;
int firstline = 1;
char *devname;
if (xflag > 0) {
printf(" extended device statistics ");
if (Tflag > 0)
printf(" tty ");
if (Cflag > 0)
printf(" cpu ");
printf("\n");
if (Iflag == 0) {
printf("device r/s w/s kr/s kw/s "
" ms/r ms/w ms/o ms/t qlen %%b ");
} else {
printf("device r/i w/i kr/i"
" kw/i qlen tsvc_t/i sb/i ");
}
if (Tflag > 0)
printf("tin tout ");
if (Cflag > 0)
printf("us ni sy in id ");
printf("\n");
}
for (dn = 0; dn < num_devices; dn++) {
int di;
if (((perf_select == 0) && (dev_select[dn].selected == 0))
|| (dev_select[dn].selected > maxshowdevs))
continue;
di = dev_select[dn].position;
if (devstat_compute_statistics(&cur.dinfo->devices[di],
havelast ? &last.dinfo->devices[di] : NULL, etime,
DSM_TOTAL_BYTES, &total_bytes,
DSM_TOTAL_BYTES_READ, &total_bytes_read,
DSM_TOTAL_BYTES_WRITE, &total_bytes_write,
DSM_TOTAL_TRANSFERS, &total_transfers,
DSM_TOTAL_TRANSFERS_READ, &total_transfers_read,
DSM_TOTAL_TRANSFERS_WRITE, &total_transfers_write,
DSM_TOTAL_BLOCKS, &total_blocks,
DSM_KB_PER_TRANSFER, &kb_per_transfer,
DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
DSM_TRANSFERS_PER_SECOND_READ, &transfers_per_second_read,
DSM_TRANSFERS_PER_SECOND_WRITE, &transfers_per_second_write,
DSM_MB_PER_SECOND, &mb_per_second,
DSM_MB_PER_SECOND_READ, &mb_per_second_read,
DSM_MB_PER_SECOND_WRITE, &mb_per_second_write,
DSM_BLOCKS_PER_SECOND, &blocks_per_second,
DSM_MS_PER_TRANSACTION, &ms_per_transaction,
DSM_MS_PER_TRANSACTION_READ, &ms_per_read,
DSM_MS_PER_TRANSACTION_WRITE, &ms_per_write,
DSM_MS_PER_TRANSACTION_OTHER, &ms_per_other,
DSM_BUSY_PCT, &busy_pct,
DSM_QUEUE_LENGTH, &queue_len,
DSM_TOTAL_DURATION, &total_duration,
DSM_TOTAL_BUSY_TIME, &busy_time,
DSM_NONE) != 0)
errx(1, "%s", devstat_errbuf);
if (perf_select != 0) {
dev_select[dn].bytes = total_bytes;
if ((dev_select[dn].selected == 0)
|| (dev_select[dn].selected > maxshowdevs))
continue;
}
if (Kflag > 0 || xflag > 0) {
int block_size = cur.dinfo->devices[di].block_size;
total_blocks = total_blocks * (block_size ?
block_size : 512) / 1024;
}
if (xflag > 0) {
if (asprintf(&devname, "%s%d",
cur.dinfo->devices[di].device_name,
cur.dinfo->devices[di].unit_number) == -1)
err(1, "asprintf");
/*
* If zflag is set, skip any devices with zero I/O.
*/
if (zflag == 0 || transfers_per_second_read > 0.05 ||
transfers_per_second_write > 0.05 ||
mb_per_second_read > ((long double).0005)/1024 ||
mb_per_second_write > ((long double).0005)/1024 ||
busy_pct > 0.5) {
if (Iflag == 0)
printf("%-8.8s %5d %5d %8.1Lf "
"%8.1Lf %5d %5d %5d %5d "
"%4" PRIu64 " %3.0Lf ",
devname,
(int)transfers_per_second_read,
(int)transfers_per_second_write,
mb_per_second_read * 1024,
mb_per_second_write * 1024,
(int)ms_per_read, (int)ms_per_write,
(int)ms_per_other,
(int)ms_per_transaction,
queue_len, busy_pct);
else
printf("%-8.8s %11.1Lf %11.1Lf "
"%12.1Lf %12.1Lf %4" PRIu64
" %10.1Lf %9.1Lf ",
devname,
(long double)total_transfers_read,
(long double)total_transfers_write,
(long double)
total_bytes_read / 1024,
(long double)
total_bytes_write / 1024,
queue_len,
total_duration, busy_time);
if (firstline) {
/*
* If this is the first device
* we're printing, also print
* CPU or TTY stats if requested.
*/
firstline = 0;
if (Tflag > 0)
printf("%4.0Lf%5.0Lf",
cur.tk_nin / etime,
cur.tk_nout / etime);
if (Cflag > 0)
cpustats();
}
printf("\n");
}
free(devname);
} else if (oflag > 0) {
int msdig = (ms_per_transaction < 100.0) ? 1 : 0;
if (Iflag == 0)
printf("%4.0Lf%4.0Lf%5.*Lf ",
blocks_per_second,
transfers_per_second,
msdig,
ms_per_transaction);
else
printf("%4.1" PRIu64 "%4.1" PRIu64 "%5.*Lf ",
total_blocks,
total_transfers,
msdig,
ms_per_transaction);
} else {
if (Iflag == 0)
printf(" %5.2Lf %3.0Lf %5.2Lf ",
kb_per_transfer,
transfers_per_second,
mb_per_second);
else {
total_mb = total_bytes;
total_mb /= 1024 * 1024;
printf(" %5.2Lf %3.1" PRIu64 " %5.2Lf ",
kb_per_transfer,
total_transfers,
total_mb);
}
}
}
if (xflag > 0 && zflag > 0 && firstline == 1 &&
(Tflag > 0 || Cflag > 0)) {
/*
* If zflag is set and we did not print any device
* lines I/O because they were all zero,
* print TTY/CPU stats.
*/
printf("%52s","");
if (Tflag > 0)
printf("%4.0Lf %5.0Lf", cur.tk_nin / etime,
cur.tk_nout / etime);
if (Cflag > 0)
cpustats();
printf("\n");
}
}
static void
cpustats(void)
{
int state;
double time;
time = 0.0;
for (state = 0; state < CPUSTATES; ++state)
time += cur.cp_time[state];
for (state = 0; state < CPUSTATES; ++state)
printf(" %2.0f",
rint(100. * cur.cp_time[state] / (time ? time : 1)));
}
static int
readvar(kvm_t *kd, const char *name, int nlid, void *ptr, size_t len)
{
if (kd != NULL) {
ssize_t nbytes;
nbytes = kvm_read(kd, namelist[nlid].n_value, ptr, len);
if (nbytes < 0) {
warnx("kvm_read(%s): %s", namelist[nlid].n_name,
kvm_geterr(kd));
return (1);
}
if (nbytes != len) {
warnx("kvm_read(%s): expected %zu bytes, got %zd bytes",
namelist[nlid].n_name, len, nbytes);
return (1);
}
} else {
size_t nlen = len;
if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
warn("sysctl(%s...) failed", name);
return (1);
}
if (nlen != len) {
warnx("sysctl(%s...): expected %lu, got %lu", name,
(unsigned long)len, (unsigned long)nlen);
return (1);
}
}
return (0);
}
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