iostat.c revision 83131 
1/*
2 * Copyright (c) 1998 Kenneth D. Merry.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: head/usr.bin/systat/iostat.c 83131 2001-09-06 04:06:12Z ken $
29 */
30/*
31 * Copyright (c) 1980, 1992, 1993
32 *	The Regents of the University of California.  All rights reserved.
33 *
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
36 * are met:
37 * 1. Redistributions of source code must retain the above copyright
38 *    notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 *    notice, this list of conditions and the following disclaimer in the
41 *    documentation and/or other materials provided with the distribution.
42 * 3. All advertising materials mentioning features or use of this software
43 *    must display the following acknowledgement:
44 *	This product includes software developed by the University of
45 *	California, Berkeley and its contributors.
46 * 4. Neither the name of the University nor the names of its contributors
47 *    may be used to endorse or promote products derived from this software
48 *    without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63#ifndef lint
64static char sccsid[] = "@(#)iostat.c	8.1 (Berkeley) 6/6/93";
65#endif not lint
66
67#include <sys/param.h>
68#include <sys/dkstat.h>
69#include <sys/sysctl.h>
70
71#include <string.h>
72#include <stdlib.h>
73#include <nlist.h>
74#include <paths.h>
75#include <devstat.h>
76#include <err.h>
77#include "systat.h"
78#include "extern.h"
79#include "devs.h"
80
81struct statinfo cur, last;
82
83static  int linesperregion;
84static  double etime;
85static  int numbers = 0;		/* default display bar graphs */
86static  int kbpt = 0;			/* default ms/seek shown */
87
88static int barlabels __P((int));
89static void histogram __P((long double, int, double));
90static int numlabels __P((int));
91static int devstats __P((int, int, int));
92static void stat1 __P((int, int));
93
94WINDOW *
95openiostat()
96{
97	return (subwin(stdscr, LINES-1-5, 0, 5, 0));
98}
99
100void
101closeiostat(w)
102	WINDOW *w;
103{
104	if (w == NULL)
105		return;
106	wclear(w);
107	wrefresh(w);
108	delwin(w);
109}
110
111int
112initiostat()
113{
114	if ((num_devices = devstat_getnumdevs(NULL)) < 0)
115		return(0);
116
117	cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
118	last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
119	bzero(cur.dinfo, sizeof(struct devinfo));
120	bzero(last.dinfo, sizeof(struct devinfo));
121
122	/*
123	 * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
124	 * how to calculate it, though.
125	 */
126	if (dsinit(100, &cur, &last, NULL) != 1)
127		return(0);
128
129	return(1);
130}
131
132void
133fetchiostat()
134{
135	struct devinfo *tmp_dinfo;
136	size_t len;
137	int err;
138
139	len = sizeof(cur.cp_time);
140	err = sysctlbyname("kern.cp_time", &cur.cp_time, &len, NULL, 0);
141	if (err || len != sizeof(cur.cp_time)) {
142		perror("kern.cp_time");
143		exit (1);
144	}
145	tmp_dinfo = last.dinfo;
146	last.dinfo = cur.dinfo;
147	cur.dinfo = tmp_dinfo;
148
149	last.busy_time = cur.busy_time;
150
151	/*
152	 * Here what we want to do is refresh our device stats.
153	 * getdevs() returns 1 when the device list has changed.
154	 * If the device list has changed, we want to go through
155	 * the selection process again, in case a device that we
156	 * were previously displaying has gone away.
157	 */
158	switch (devstat_getdevs(NULL, &cur)) {
159	case -1:
160		errx(1, "%s", devstat_errbuf);
161		break;
162	case 1:
163		cmdiostat("refresh", NULL);
164		break;
165	default:
166		break;
167	}
168	num_devices = cur.dinfo->numdevs;
169	generation = cur.dinfo->generation;
170
171}
172
173#define	INSET	10
174
175void
176labeliostat()
177{
178	int row;
179
180	row = 0;
181	wmove(wnd, row, 0); wclrtobot(wnd);
182	mvwaddstr(wnd, row++, INSET,
183	    "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
184	mvwaddstr(wnd, row++, 0, "cpu  user|");
185	mvwaddstr(wnd, row++, 0, "     nice|");
186	mvwaddstr(wnd, row++, 0, "   system|");
187	mvwaddstr(wnd, row++, 0, "interrupt|");
188	mvwaddstr(wnd, row++, 0, "     idle|");
189	if (numbers)
190		row = numlabels(row + 1);
191	else
192		row = barlabels(row + 1);
193}
194
195static int
196numlabels(row)
197	int row;
198{
199	int i, col, regions, ndrives;
200	char tmpstr[10];
201
202#define COLWIDTH	17
203#define DRIVESPERLINE	((wnd->_maxx - INSET) / COLWIDTH)
204	for (ndrives = 0, i = 0; i < num_devices; i++)
205		if (dev_select[i].selected)
206			ndrives++;
207	regions = howmany(ndrives, DRIVESPERLINE);
208	/*
209	 * Deduct -regions for blank line after each scrolling region.
210	 */
211	linesperregion = (wnd->_maxy - row - regions) / regions;
212	/*
213	 * Minimum region contains space for two
214	 * label lines and one line of statistics.
215	 */
216	if (linesperregion < 3)
217		linesperregion = 3;
218	col = INSET;
219	for (i = 0; i < num_devices; i++)
220		if (dev_select[i].selected) {
221			if (col + COLWIDTH >= wnd->_maxx - INSET) {
222				col = INSET, row += linesperregion + 1;
223				if (row > wnd->_maxy - (linesperregion + 1))
224					break;
225			}
226			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
227				dev_select[i].unit_number);
228			mvwaddstr(wnd, row, col + 4, tmpstr);
229			mvwaddstr(wnd, row + 1, col, "  KB/t tps  MB/s ");
230			col += COLWIDTH;
231		}
232	if (col)
233		row += linesperregion + 1;
234	return (row);
235}
236
237static int
238barlabels(row)
239	int row;
240{
241	int i;
242	char tmpstr[10];
243
244	mvwaddstr(wnd, row++, INSET,
245	    "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
246	linesperregion = 2 + kbpt;
247	for (i = 0; i < num_devices; i++)
248		if (dev_select[i].selected) {
249			if (row > wnd->_maxy - linesperregion)
250				break;
251			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
252				dev_select[i].unit_number);
253			mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
254				  tmpstr);
255			mvwaddstr(wnd, row++, 0, "      tps|");
256			if (kbpt)
257				mvwaddstr(wnd, row++, 0, "     KB/t|");
258		}
259	return (row);
260}
261
262
263void
264showiostat()
265{
266	register long t;
267	register int i, row, col;
268
269#define X(fld)	t = cur.fld[i]; cur.fld[i] -= last.fld[i]; last.fld[i] = t
270	etime = 0;
271	for(i = 0; i < CPUSTATES; i++) {
272		X(cp_time);
273		etime += cur.cp_time[i];
274	}
275	if (etime == 0.0)
276		etime = 1.0;
277	etime /= hertz;
278	row = 1;
279	for (i = 0; i < CPUSTATES; i++)
280		stat1(row++, i);
281	if (!numbers) {
282		row += 2;
283		for (i = 0; i < num_devices; i++)
284			if (dev_select[i].selected) {
285				if (row > wnd->_maxy - linesperregion)
286					break;
287				row = devstats(row, INSET, i);
288			}
289		return;
290	}
291	col = INSET;
292	wmove(wnd, row + linesperregion, 0);
293	wdeleteln(wnd);
294	wmove(wnd, row + 3, 0);
295	winsertln(wnd);
296	for (i = 0; i < num_devices; i++)
297		if (dev_select[i].selected) {
298			if (col + COLWIDTH >= wnd->_maxx - INSET) {
299				col = INSET, row += linesperregion + 1;
300				if (row > wnd->_maxy - (linesperregion + 1))
301					break;
302				wmove(wnd, row + linesperregion, 0);
303				wdeleteln(wnd);
304				wmove(wnd, row + 3, 0);
305				winsertln(wnd);
306			}
307			(void) devstats(row + 3, col, i);
308			col += COLWIDTH;
309		}
310}
311
312static int
313devstats(row, col, dn)
314	int row, col, dn;
315{
316	long double transfers_per_second;
317	long double kb_per_transfer, mb_per_second;
318	long double busy_seconds;
319	int di;
320
321	di = dev_select[dn].position;
322
323	busy_seconds = devstat_compute_etime(cur.busy_time, last.busy_time);
324
325	if (devstat_compute_statistics(&cur.dinfo->devices[di],
326	    &last.dinfo->devices[di], busy_seconds,
327	    DSM_KB_PER_TRANSFER, &kb_per_transfer,
328	    DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
329	    DSM_MB_PER_SECOND, &mb_per_second, DSM_NONE) != 0)
330		errx(1, "%s", devstat_errbuf);
331
332	if (numbers) {
333		mvwprintw(wnd, row, col, " %5.2Lf %3.0Lf %5.2Lf ",
334			 kb_per_transfer, transfers_per_second,
335			 mb_per_second);
336		return(row);
337	}
338	wmove(wnd, row++, col);
339	histogram(mb_per_second, 50, .5);
340	wmove(wnd, row++, col);
341	histogram(transfers_per_second, 50, .5);
342	if (kbpt) {
343		wmove(wnd, row++, col);
344		histogram(kb_per_transfer, 50, .5);
345	}
346
347	return(row);
348
349}
350
351static void
352stat1(row, o)
353	int row, o;
354{
355	register int i;
356	double time;
357
358	time = 0;
359	for (i = 0; i < CPUSTATES; i++)
360		time += cur.cp_time[i];
361	if (time == 0.0)
362		time = 1.0;
363	wmove(wnd, row, INSET);
364#define CPUSCALE	0.5
365	histogram(100.0 * cur.cp_time[o] / time, 50, CPUSCALE);
366}
367
368static void
369histogram(val, colwidth, scale)
370	long double val;
371	int colwidth;
372	double scale;
373{
374	char buf[10];
375	register int k;
376	register int v = (int)(val * scale) + 0.5;
377
378	k = MIN(v, colwidth);
379	if (v > colwidth) {
380		snprintf(buf, sizeof(buf), "%5.2Lf", val);
381		k -= strlen(buf);
382		while (k--)
383			waddch(wnd, 'X');
384		waddstr(wnd, buf);
385		return;
386	}
387	while (k--)
388		waddch(wnd, 'X');
389	wclrtoeol(wnd);
390}
391
392int
393cmdiostat(cmd, args)
394	char *cmd, *args;
395{
396
397	if (prefix(cmd, "kbpt"))
398		kbpt = !kbpt;
399	else if (prefix(cmd, "numbers"))
400		numbers = 1;
401	else if (prefix(cmd, "bars"))
402		numbers = 0;
403	else if (!dscmd(cmd, args, 100, &cur))
404		return (0);
405	wclear(wnd);
406	labeliostat();
407	refresh();
408	return (1);
409}
410