iostat.c revision 175387 
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/*
29 * Copyright (c) 1980, 1992, 1993
30 *	The Regents of the University of California.  All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 *    notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 *    notice, this list of conditions and the following disclaimer in the
39 *    documentation and/or other materials provided with the distribution.
40 * 3. All advertising materials mentioning features or use of this software
41 *    must display the following acknowledgement:
42 *	This product includes software developed by the University of
43 *	California, Berkeley and its contributors.
44 * 4. Neither the name of the University nor the names of its contributors
45 *    may be used to endorse or promote products derived from this software
46 *    without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 */
60
61#include <sys/cdefs.h>
62
63__FBSDID("$FreeBSD: head/usr.bin/systat/iostat.c 175387 2008-01-16 19:27:43Z delphij $");
64
65#ifdef lint
66static const char sccsid[] = "@(#)iostat.c	8.1 (Berkeley) 6/6/93";
67#endif
68
69#include <sys/param.h>
70#include <sys/sysctl.h>
71#include <sys/resource.h>
72
73#include <devstat.h>
74#include <err.h>
75#include <nlist.h>
76#include <paths.h>
77#include <stdlib.h>
78#include <string.h>
79
80#include "systat.h"
81#include "extern.h"
82#include "devs.h"
83
84struct statinfo cur, last;
85
86static  int linesperregion;
87static  double etime;
88static  int numbers = 0;		/* default display bar graphs */
89static  int kbpt = 0;			/* default ms/seek shown */
90
91static int barlabels(int);
92static void histogram(long double, int, double);
93static int numlabels(int);
94static int devstats(int, int, int);
95static void stat1(int, int);
96
97WINDOW *
98openiostat(void)
99{
100	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
101}
102
103void
104closeiostat(WINDOW *w)
105{
106	if (w == NULL)
107		return;
108	wclear(w);
109	wrefresh(w);
110	delwin(w);
111}
112
113int
114initiostat(void)
115{
116	if ((num_devices = devstat_getnumdevs(NULL)) < 0)
117		return(0);
118
119	cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
120	last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
121	bzero(cur.dinfo, sizeof(struct devinfo));
122	bzero(last.dinfo, sizeof(struct devinfo));
123
124	/*
125	 * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
126	 * how to calculate it, though.
127	 */
128	if (dsinit(100, &cur, &last, NULL) != 1)
129		return(0);
130
131	return(1);
132}
133
134void
135fetchiostat(void)
136{
137	struct devinfo *tmp_dinfo;
138	size_t len;
139
140	len = sizeof(cur.cp_time);
141	if (sysctlbyname("kern.cp_time", &cur.cp_time, &len, NULL, 0)
142	    || len != sizeof(cur.cp_time)) {
143		perror("kern.cp_time");
144		exit (1);
145	}
146	tmp_dinfo = last.dinfo;
147	last.dinfo = cur.dinfo;
148	cur.dinfo = tmp_dinfo;
149
150	last.snap_time = cur.snap_time;
151
152	/*
153	 * Here what we want to do is refresh our device stats.
154	 * getdevs() returns 1 when the device list has changed.
155	 * If the device list has changed, we want to go through
156	 * the selection process again, in case a device that we
157	 * were previously displaying has gone away.
158	 */
159	switch (devstat_getdevs(NULL, &cur)) {
160	case -1:
161		errx(1, "%s", devstat_errbuf);
162		break;
163	case 1:
164		cmdiostat("refresh", NULL);
165		break;
166	default:
167		break;
168	}
169	num_devices = cur.dinfo->numdevs;
170	generation = cur.dinfo->generation;
171
172}
173
174#define	INSET	10
175
176void
177labeliostat(void)
178{
179	int row;
180
181	row = 0;
182	wmove(wnd, row, 0); wclrtobot(wnd);
183	mvwaddstr(wnd, row++, INSET,
184	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
185	mvwaddstr(wnd, row++, 0, "cpu  user|");
186	mvwaddstr(wnd, row++, 0, "     nice|");
187	mvwaddstr(wnd, row++, 0, "   system|");
188	mvwaddstr(wnd, row++, 0, "interrupt|");
189	mvwaddstr(wnd, row++, 0, "     idle|");
190	if (numbers)
191		row = numlabels(row + 1);
192	else
193		row = barlabels(row + 1);
194}
195
196static int
197numlabels(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(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(void)
264{
265	long t;
266	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(int row, int _col, int dn)
313{
314	long double transfers_per_second;
315	long double kb_per_transfer, mb_per_second;
316	long double busy_seconds;
317	int di;
318
319	di = dev_select[dn].position;
320
321	busy_seconds = cur.snap_time - last.snap_time;
322
323	if (devstat_compute_statistics(&cur.dinfo->devices[di],
324	    &last.dinfo->devices[di], busy_seconds,
325	    DSM_KB_PER_TRANSFER, &kb_per_transfer,
326	    DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
327	    DSM_MB_PER_SECOND, &mb_per_second, DSM_NONE) != 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(int row, int o)
351{
352	int i;
353	double dtime;
354
355	dtime = 0.0;
356	for (i = 0; i < CPUSTATES; i++)
357		dtime += cur.cp_time[i];
358	if (dtime == 0.0)
359		dtime = 1.0;
360	wmove(wnd, row, INSET);
361#define CPUSCALE	0.5
362	histogram(100.0 * cur.cp_time[o] / dtime, 50, CPUSCALE);
363}
364
365static void
366histogram(long double val, int colwidth, double scale)
367{
368	char buf[10];
369	int k;
370	int v = (int)(val * scale) + 0.5;
371
372	k = MIN(v, colwidth);
373	if (v > colwidth) {
374		snprintf(buf, sizeof(buf), "%5.2Lf", val);
375		k -= strlen(buf);
376		while (k--)
377			waddch(wnd, 'X');
378		waddstr(wnd, buf);
379		return;
380	}
381	while (k--)
382		waddch(wnd, 'X');
383	wclrtoeol(wnd);
384}
385
386int
387cmdiostat(const char *cmd, const char *args)
388{
389
390	if (prefix(cmd, "kbpt"))
391		kbpt = !kbpt;
392	else if (prefix(cmd, "numbers"))
393		numbers = 1;
394	else if (prefix(cmd, "bars"))
395		numbers = 0;
396	else if (!dscmd(cmd, args, 100, &cur))
397		return (0);
398	wclear(wnd);
399	labeliostat();
400	refresh();
401	return (1);
402}
403