iostat.c revision 69141 
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 69141 2000-11-25 03:47:36Z rwatson $
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
70#include <string.h>
71#include <stdlib.h>
72#include <nlist.h>
73#include <paths.h>
74#include <devstat.h>
75#include <err.h>
76#include "systat.h"
77#include "extern.h"
78#include "devs.h"
79
80struct statinfo cur, last;
81
82static  int linesperregion;
83static  double etime;
84static  int numbers = 0;		/* default display bar graphs */
85static  int kbpt = 0;			/* default ms/seek shown */
86
87static int barlabels __P((int));
88static void histogram __P((long double, int, double));
89static int numlabels __P((int));
90static int devstats __P((int, int, int));
91static void stat1 __P((int, int));
92
93WINDOW *
94openiostat()
95{
96	return (subwin(stdscr, LINES-1-5, 0, 5, 0));
97}
98
99void
100closeiostat(w)
101	WINDOW *w;
102{
103	if (w == NULL)
104		return;
105	wclear(w);
106	wrefresh(w);
107	delwin(w);
108}
109
110int
111initiostat()
112{
113	if (num_devices = getnumdevs() < 0)
114		return(0);
115
116	cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
117	last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
118	bzero(cur.dinfo, sizeof(struct devinfo));
119	bzero(last.dinfo, sizeof(struct devinfo));
120
121	/*
122	 * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
123	 * how to calculate it, though.
124	 */
125	if (dsinit(100, &cur, &last, NULL) != 1)
126		return(0);
127
128	return(1);
129}
130
131void
132fetchiostat()
133{
134	struct devinfo *tmp_dinfo;
135	size_t len;
136	int err;
137
138	len = sizeof(cur.cp_time);
139	err = sysctlbyname("kern.cp_time", &cur.cp_time, &len, NULL, 0);
140	if (err || len != sizeof(cur.cp_time)) {
141		perror("kern.cp_time");
142		exit (1);
143	}
144	tmp_dinfo = last.dinfo;
145	last.dinfo = cur.dinfo;
146	cur.dinfo = tmp_dinfo;
147
148	last.busy_time = cur.busy_time;
149
150	/*
151	 * Here what we want to do is refresh our device stats.
152	 * getdevs() returns 1 when the device list has changed.
153	 * If the device list has changed, we want to go through
154	 * the selection process again, in case a device that we
155	 * were previously displaying has gone away.
156	 */
157	switch (getdevs(&cur)) {
158	case -1:
159		errx(1, "%s", devstat_errbuf);
160		break;
161	case 1:
162		cmdiostat("refresh", NULL);
163		break;
164	default:
165		break;
166	}
167	num_devices = cur.dinfo->numdevs;
168	generation = cur.dinfo->generation;
169
170}
171
172#define	INSET	10
173
174void
175labeliostat()
176{
177	int row;
178
179	row = 0;
180	wmove(wnd, row, 0); wclrtobot(wnd);
181	mvwaddstr(wnd, row++, INSET,
182	    "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
183	mvwaddstr(wnd, row++, 0, "cpu  user|");
184	mvwaddstr(wnd, row++, 0, "     nice|");
185	mvwaddstr(wnd, row++, 0, "   system|");
186	mvwaddstr(wnd, row++, 0, "interrupt|");
187	mvwaddstr(wnd, row++, 0, "     idle|");
188	if (numbers)
189		row = numlabels(row + 1);
190	else
191		row = barlabels(row + 1);
192}
193
194static int
195numlabels(row)
196	int row;
197{
198	int i, col, regions, ndrives;
199	char tmpstr[10];
200
201#define COLWIDTH	17
202#define DRIVESPERLINE	((wnd->_maxx - INSET) / COLWIDTH)
203	for (ndrives = 0, i = 0; i < num_devices; i++)
204		if (dev_select[i].selected)
205			ndrives++;
206	regions = howmany(ndrives, DRIVESPERLINE);
207	/*
208	 * Deduct -regions for blank line after each scrolling region.
209	 */
210	linesperregion = (wnd->_maxy - row - regions) / regions;
211	/*
212	 * Minimum region contains space for two
213	 * label lines and one line of statistics.
214	 */
215	if (linesperregion < 3)
216		linesperregion = 3;
217	col = INSET;
218	for (i = 0; i < num_devices; i++)
219		if (dev_select[i].selected) {
220			if (col + COLWIDTH >= wnd->_maxx - INSET) {
221				col = INSET, row += linesperregion + 1;
222				if (row > wnd->_maxy - (linesperregion + 1))
223					break;
224			}
225			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
226				dev_select[i].unit_number);
227			mvwaddstr(wnd, row, col + 4, tmpstr);
228			mvwaddstr(wnd, row + 1, col, "  KB/t tps  MB/s ");
229			col += COLWIDTH;
230		}
231	if (col)
232		row += linesperregion + 1;
233	return (row);
234}
235
236static int
237barlabels(row)
238	int row;
239{
240	int i;
241	char tmpstr[10];
242
243	mvwaddstr(wnd, row++, INSET,
244	    "/0   /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
245	linesperregion = 2 + kbpt;
246	for (i = 0; i < num_devices; i++)
247		if (dev_select[i].selected) {
248			if (row > wnd->_maxy - linesperregion)
249				break;
250			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
251				dev_select[i].unit_number);
252			mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
253				  tmpstr);
254			mvwaddstr(wnd, row++, 0, "      tps|");
255			if (kbpt)
256				mvwaddstr(wnd, row++, 0, "     KB/t|");
257		}
258	return (row);
259}
260
261
262void
263showiostat()
264{
265	register long t;
266	register int i, row, col;
267
268#define X(fld)	t = cur.fld[i]; cur.fld[i] -= last.fld[i]; last.fld[i] = t
269	etime = 0;
270	for(i = 0; i < CPUSTATES; i++) {
271		X(cp_time);
272		etime += cur.cp_time[i];
273	}
274	if (etime == 0.0)
275		etime = 1.0;
276	etime /= hertz;
277	row = 1;
278	for (i = 0; i < CPUSTATES; i++)
279		stat1(row++, i);
280	if (!numbers) {
281		row += 2;
282		for (i = 0; i < num_devices; i++)
283			if (dev_select[i].selected) {
284				if (row > wnd->_maxy - linesperregion)
285					break;
286				row = devstats(row, INSET, i);
287			}
288		return;
289	}
290	col = INSET;
291	wmove(wnd, row + linesperregion, 0);
292	wdeleteln(wnd);
293	wmove(wnd, row + 3, 0);
294	winsertln(wnd);
295	for (i = 0; i < num_devices; i++)
296		if (dev_select[i].selected) {
297			if (col + COLWIDTH >= wnd->_maxx - INSET) {
298				col = INSET, row += linesperregion + 1;
299				if (row > wnd->_maxy - (linesperregion + 1))
300					break;
301				wmove(wnd, row + linesperregion, 0);
302				wdeleteln(wnd);
303				wmove(wnd, row + 3, 0);
304				winsertln(wnd);
305			}
306			(void) devstats(row + 3, col, i);
307			col += COLWIDTH;
308		}
309}
310
311static int
312devstats(row, col, dn)
313	int row, col, dn;
314{
315	long double transfers_per_second;
316	long double kb_per_transfer, mb_per_second;
317	long double busy_seconds;
318	int di;
319
320	di = dev_select[dn].position;
321
322	busy_seconds = compute_etime(cur.busy_time, last.busy_time);
323
324	if (compute_stats(&cur.dinfo->devices[di], &last.dinfo->devices[di],
325			  busy_seconds, NULL, NULL, NULL,
326			  &kb_per_transfer, &transfers_per_second,
327			  &mb_per_second, NULL, NULL) != 0)
328		errx(1, "%s", devstat_errbuf);
329
330	if (numbers) {
331		mvwprintw(wnd, row, col, " %5.2Lf %3.0Lf %5.2Lf ",
332			 kb_per_transfer, transfers_per_second,
333			 mb_per_second);
334		return(row);
335	}
336	wmove(wnd, row++, col);
337	histogram(mb_per_second, 50, .5);
338	wmove(wnd, row++, col);
339	histogram(transfers_per_second, 50, .5);
340	if (kbpt) {
341		wmove(wnd, row++, col);
342		histogram(kb_per_transfer, 50, .5);
343	}
344
345	return(row);
346
347}
348
349static void
350stat1(row, o)
351	int row, o;
352{
353	register int i;
354	double time;
355
356	time = 0;
357	for (i = 0; i < CPUSTATES; i++)
358		time += cur.cp_time[i];
359	if (time == 0.0)
360		time = 1.0;
361	wmove(wnd, row, INSET);
362#define CPUSCALE	0.5
363	histogram(100.0 * cur.cp_time[o] / time, 50, CPUSCALE);
364}
365
366static void
367histogram(val, colwidth, scale)
368	long double val;
369	int colwidth;
370	double scale;
371{
372	char buf[10];
373	register int k;
374	register int v = (int)(val * scale) + 0.5;
375
376	k = MIN(v, colwidth);
377	if (v > colwidth) {
378		snprintf(buf, sizeof(buf), "%5.2Lf", val);
379		k -= strlen(buf);
380		while (k--)
381			waddch(wnd, 'X');
382		waddstr(wnd, buf);
383		return;
384	}
385	while (k--)
386		waddch(wnd, 'X');
387	wclrtoeol(wnd);
388}
389
390int
391cmdiostat(cmd, args)
392	char *cmd, *args;
393{
394
395	if (prefix(cmd, "kbpt"))
396		kbpt = !kbpt;
397	else if (prefix(cmd, "numbers"))
398		numbers = 1;
399	else if (prefix(cmd, "bars"))
400		numbers = 0;
401	else if (!dscmd(cmd, args, 100, &cur))
402		return (0);
403	wclear(wnd);
404	labeliostat();
405	refresh();
406	return (1);
407}
408