iostat.c revision 50477 
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 50477 1999-08-28 01:08:13Z peter $
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/buf.h>
69#include <sys/dkstat.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
81static struct nlist namelist[] = {
82#define X_CP_TIME	0
83	{ "_cp_time" },
84#ifdef vax
85#define X_MBDINIT	(X_CP_TIME+1)
86	{ "_mbdinit" },
87#define X_UBDINIT	(X_CP_TIME+2)
88	{ "_ubdinit" },
89#endif
90#ifdef tahoe
91#define	X_VBDINIT	(X_CP_TIME+1)
92	{ "_vbdinit" },
93#endif
94	{ "" },
95};
96
97struct statinfo cur, last;
98
99static  int linesperregion;
100static  double etime;
101static  int numbers = 0;		/* default display bar graphs */
102static  int kbpt = 0;			/* default ms/seek shown */
103
104static int barlabels __P((int));
105static void histogram __P((long double, int, double));
106static int numlabels __P((int));
107static int devstats __P((int, int, int));
108static void stat1 __P((int, int));
109
110WINDOW *
111openiostat()
112{
113	return (subwin(stdscr, LINES-1-5, 0, 5, 0));
114}
115
116void
117closeiostat(w)
118	WINDOW *w;
119{
120	if (w == NULL)
121		return;
122	wclear(w);
123	wrefresh(w);
124	delwin(w);
125}
126
127int
128initiostat()
129{
130	if (num_devices = getnumdevs() < 0)
131		return(0);
132
133	cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
134	last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
135	bzero(cur.dinfo, sizeof(struct devinfo));
136	bzero(last.dinfo, sizeof(struct devinfo));
137
138	/*
139	 * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
140	 * how to calculate it, though.
141	 */
142	if (dsinit(100, &cur, &last, NULL) != 1)
143		return(0);
144
145	if (kvm_nlist(kd, namelist)) {
146       		nlisterr(namelist);
147		return(0);
148	}
149
150	return(1);
151}
152
153void
154fetchiostat()
155{
156	struct devinfo *tmp_dinfo;
157
158	NREAD(X_CP_TIME, cur.cp_time, sizeof(cur.cp_time));
159	tmp_dinfo = last.dinfo;
160	last.dinfo = cur.dinfo;
161	cur.dinfo = tmp_dinfo;
162
163	last.busy_time = cur.busy_time;
164
165	/*
166	 * Here what we want to do is refresh our device stats.
167	 * getdevs() returns 1 when the device list has changed.
168	 * If the device list has changed, we want to go through
169	 * the selection process again, in case a device that we
170	 * were previously displaying has gone away.
171	 */
172	switch (getdevs(&cur)) {
173	case -1:
174		errx(1, "%s", devstat_errbuf);
175		break;
176	case 1:
177		cmdiostat("refresh", NULL);
178		break;
179	default:
180		break;
181	}
182	num_devices = cur.dinfo->numdevs;
183	generation = cur.dinfo->generation;
184
185}
186
187#define	INSET	10
188
189void
190labeliostat()
191{
192	int row;
193
194	row = 0;
195	wmove(wnd, row, 0); wclrtobot(wnd);
196	mvwaddstr(wnd, row++, INSET,
197	    "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
198	mvwaddstr(wnd, row++, 0, "cpu  user|");
199	mvwaddstr(wnd, row++, 0, "     nice|");
200	mvwaddstr(wnd, row++, 0, "   system|");
201	mvwaddstr(wnd, row++, 0, "interrupt|");
202	mvwaddstr(wnd, row++, 0, "     idle|");
203	if (numbers)
204		row = numlabels(row + 1);
205	else
206		row = barlabels(row + 1);
207}
208
209static int
210numlabels(row)
211	int row;
212{
213	int i, col, regions, ndrives;
214	char tmpstr[10];
215
216#define COLWIDTH	17
217#define DRIVESPERLINE	((wnd->maxx - INSET) / COLWIDTH)
218	for (ndrives = 0, i = 0; i < num_devices; i++)
219		if (dev_select[i].selected)
220			ndrives++;
221	regions = howmany(ndrives, DRIVESPERLINE);
222	/*
223	 * Deduct -regions for blank line after each scrolling region.
224	 */
225	linesperregion = (wnd->maxy - row - regions) / regions;
226	/*
227	 * Minimum region contains space for two
228	 * label lines and one line of statistics.
229	 */
230	if (linesperregion < 3)
231		linesperregion = 3;
232	col = INSET;
233	for (i = 0; i < num_devices; i++)
234		if (dev_select[i].selected) {
235			if (col + COLWIDTH >= wnd->maxx - INSET) {
236				col = INSET, row += linesperregion + 1;
237				if (row > wnd->maxy - (linesperregion + 1))
238					break;
239			}
240			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
241				dev_select[i].unit_number);
242			mvwaddstr(wnd, row, col + 4, tmpstr);
243			mvwaddstr(wnd, row + 1, col, "  KB/t tps  MB/s ");
244			col += COLWIDTH;
245		}
246	if (col)
247		row += linesperregion + 1;
248	return (row);
249}
250
251static int
252barlabels(row)
253	int row;
254{
255	int i;
256	char tmpstr[10];
257
258	mvwaddstr(wnd, row++, INSET,
259	    "/0   /5   /10  /15  /20  /25  /30  /35  /40  /45  /50");
260	linesperregion = 2 + kbpt;
261	for (i = 0; i < num_devices; i++)
262		if (dev_select[i].selected) {
263			if (row > wnd->maxy - linesperregion)
264				break;
265			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
266				dev_select[i].unit_number);
267			mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
268				  tmpstr);
269			mvwaddstr(wnd, row++, 0, "      tps|");
270			if (kbpt)
271				mvwaddstr(wnd, row++, 0, "     KB/t|");
272		}
273	return (row);
274}
275
276
277void
278showiostat()
279{
280	register long t;
281	register int i, row, col;
282
283#define X(fld)	t = cur.fld[i]; cur.fld[i] -= last.fld[i]; last.fld[i] = t
284	etime = 0;
285	for(i = 0; i < CPUSTATES; i++) {
286		X(cp_time);
287		etime += cur.cp_time[i];
288	}
289	if (etime == 0.0)
290		etime = 1.0;
291	etime /= hertz;
292	row = 1;
293	for (i = 0; i < CPUSTATES; i++)
294		stat1(row++, i);
295	if (!numbers) {
296		row += 2;
297		for (i = 0; i < num_devices; i++)
298			if (dev_select[i].selected) {
299				if (row > wnd->maxy - linesperregion)
300					break;
301				row = devstats(row, INSET, i);
302			}
303		return;
304	}
305	col = INSET;
306	wmove(wnd, row + linesperregion, 0);
307	wdeleteln(wnd);
308	wmove(wnd, row + 3, 0);
309	winsertln(wnd);
310	for (i = 0; i < num_devices; i++)
311		if (dev_select[i].selected) {
312			if (col + COLWIDTH >= wnd->maxx - INSET) {
313				col = INSET, row += linesperregion + 1;
314				if (row > wnd->maxy - (linesperregion + 1))
315					break;
316				wmove(wnd, row + linesperregion, 0);
317				wdeleteln(wnd);
318				wmove(wnd, row + 3, 0);
319				winsertln(wnd);
320			}
321			(void) devstats(row + 3, col, i);
322			col += COLWIDTH;
323		}
324}
325
326static int
327devstats(row, col, dn)
328	int row, col, dn;
329{
330	long double transfers_per_second;
331	long double kb_per_transfer, mb_per_second;
332	long double busy_seconds;
333	int di;
334
335	di = dev_select[dn].position;
336
337	busy_seconds = compute_etime(cur.busy_time, last.busy_time);
338
339	if (compute_stats(&cur.dinfo->devices[di], &last.dinfo->devices[di],
340			  busy_seconds, NULL, NULL, NULL,
341			  &kb_per_transfer, &transfers_per_second,
342			  &mb_per_second, NULL, NULL) != 0)
343		errx(1, "%s", devstat_errbuf);
344
345	if (numbers) {
346		mvwprintw(wnd, row, col, " %5.2Lf %3.0Lf %5.2Lf ",
347			 kb_per_transfer, transfers_per_second,
348			 mb_per_second);
349		return(row);
350	}
351	wmove(wnd, row++, col);
352	histogram(mb_per_second, 50, 1.0);
353	wmove(wnd, row++, col);
354	histogram(transfers_per_second, 50, 1.0);
355	if (kbpt) {
356		wmove(wnd, row++, col);
357		histogram(kb_per_transfer, 50, 1.0);
358	}
359
360	return(row);
361
362}
363
364static void
365stat1(row, o)
366	int row, o;
367{
368	register int i;
369	double time;
370
371	time = 0;
372	for (i = 0; i < CPUSTATES; i++)
373		time += cur.cp_time[i];
374	if (time == 0.0)
375		time = 1.0;
376	wmove(wnd, row, INSET);
377#define CPUSCALE	0.5
378	histogram(100.0 * cur.cp_time[o] / time, 50, CPUSCALE);
379}
380
381static void
382histogram(val, colwidth, scale)
383	long double val;
384	int colwidth;
385	double scale;
386{
387	char buf[10];
388	register int k;
389	register int v = (int)(val * scale) + 0.5;
390
391	k = MIN(v, colwidth);
392	if (v > colwidth) {
393		snprintf(buf, sizeof(buf), "%5.2Lf", val);
394		k -= strlen(buf);
395		while (k--)
396			waddch(wnd, 'X');
397		waddstr(wnd, buf);
398		return;
399	}
400	while (k--)
401		waddch(wnd, 'X');
402	wclrtoeol(wnd);
403}
404
405int
406cmdiostat(cmd, args)
407	char *cmd, *args;
408{
409
410	if (prefix(cmd, "kbpt"))
411		kbpt = !kbpt;
412	else if (prefix(cmd, "numbers"))
413		numbers = 1;
414	else if (prefix(cmd, "bars"))
415		numbers = 0;
416	else if (!dscmd(cmd, args, 100, &cur))
417		return (0);
418	wclear(wnd);
419	labeliostat();
420	refresh();
421	return (1);
422}
423