iostat.c revision 200420 
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 200420 2009-12-11 23:35:38Z 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 <stdlib.h>
77#include <string.h>
78
79#include "systat.h"
80#include "extern.h"
81#include "devs.h"
82
83struct statinfo cur, last;
84
85static  int linesperregion;
86static  double etime;
87static  int numbers = 0;		/* default display bar graphs */
88static  int kbpt = 0;			/* default ms/seek shown */
89
90static int barlabels(int);
91static void histogram(long double, int, double);
92static int numlabels(int);
93static int devstats(int, int, int);
94static void stat1(int, int);
95
96WINDOW *
97openiostat(void)
98{
99	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
100}
101
102void
103closeiostat(WINDOW *w)
104{
105	if (w == NULL)
106		return;
107	wclear(w);
108	wrefresh(w);
109	delwin(w);
110}
111
112int
113initiostat(void)
114{
115	if ((num_devices = devstat_getnumdevs(NULL)) < 0)
116		return(0);
117
118	cur.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
119	last.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
120	bzero(cur.dinfo, sizeof(struct devinfo));
121	bzero(last.dinfo, sizeof(struct devinfo));
122
123	/*
124	 * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
125	 * how to calculate it, though.
126	 */
127	if (dsinit(100, &cur, &last, NULL) != 1)
128		return(0);
129
130	return(1);
131}
132
133void
134fetchiostat(void)
135{
136	struct devinfo *tmp_dinfo;
137	size_t len;
138
139	len = sizeof(cur.cp_time);
140	if (sysctlbyname("kern.cp_time", &cur.cp_time, &len, NULL, 0)
141	    || 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.snap_time = cur.snap_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(void)
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(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(int row)
238{
239	int i;
240	char tmpstr[10];
241
242	mvwaddstr(wnd, row++, INSET,
243	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
244	linesperregion = 2 + kbpt;
245	for (i = 0; i < num_devices; i++)
246		if (dev_select[i].selected) {
247			if (row > wnd->_maxy - linesperregion)
248				break;
249			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
250				dev_select[i].unit_number);
251			mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
252				  tmpstr);
253			mvwaddstr(wnd, row++, 0, "      tps|");
254			if (kbpt)
255				mvwaddstr(wnd, row++, 0, "     KB/t|");
256		}
257	return (row);
258}
259
260
261void
262showiostat(void)
263{
264	long t;
265	int i, row, _col;
266
267#define X(fld)	t = cur.fld[i]; cur.fld[i] -= last.fld[i]; last.fld[i] = t
268	etime = 0;
269	for(i = 0; i < CPUSTATES; i++) {
270		X(cp_time);
271		etime += cur.cp_time[i];
272	}
273	if (etime == 0.0)
274		etime = 1.0;
275	etime /= hertz;
276	row = 1;
277	for (i = 0; i < CPUSTATES; i++)
278		stat1(row++, i);
279	if (!numbers) {
280		row += 2;
281		for (i = 0; i < num_devices; i++)
282			if (dev_select[i].selected) {
283				if (row > wnd->_maxy - linesperregion)
284					break;
285				row = devstats(row, INSET, i);
286			}
287		return;
288	}
289	_col = INSET;
290	wmove(wnd, row + linesperregion, 0);
291	wdeleteln(wnd);
292	wmove(wnd, row + 3, 0);
293	winsertln(wnd);
294	for (i = 0; i < num_devices; i++)
295		if (dev_select[i].selected) {
296			if (_col + COLWIDTH >= wnd->_maxx - INSET) {
297				_col = INSET, row += linesperregion + 1;
298				if (row > wnd->_maxy - (linesperregion + 1))
299					break;
300				wmove(wnd, row + linesperregion, 0);
301				wdeleteln(wnd);
302				wmove(wnd, row + 3, 0);
303				winsertln(wnd);
304			}
305			(void) devstats(row + 3, _col, i);
306			_col += COLWIDTH;
307		}
308}
309
310static int
311devstats(int row, int _col, int dn)
312{
313	long double transfers_per_second;
314	long double kb_per_transfer, mb_per_second;
315	long double busy_seconds;
316	int di;
317
318	di = dev_select[dn].position;
319
320	busy_seconds = cur.snap_time - last.snap_time;
321
322	if (devstat_compute_statistics(&cur.dinfo->devices[di],
323	    &last.dinfo->devices[di], busy_seconds,
324	    DSM_KB_PER_TRANSFER, &kb_per_transfer,
325	    DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
326	    DSM_MB_PER_SECOND, &mb_per_second, DSM_NONE) != 0)
327		errx(1, "%s", devstat_errbuf);
328
329	if (numbers) {
330		mvwprintw(wnd, row, _col, " %5.2Lf %3.0Lf %5.2Lf ",
331			 kb_per_transfer, transfers_per_second,
332			 mb_per_second);
333		return(row);
334	}
335	wmove(wnd, row++, _col);
336	histogram(mb_per_second, 50, .5);
337	wmove(wnd, row++, _col);
338	histogram(transfers_per_second, 50, .5);
339	if (kbpt) {
340		wmove(wnd, row++, _col);
341		histogram(kb_per_transfer, 50, .5);
342	}
343
344	return(row);
345
346}
347
348static void
349stat1(int row, int o)
350{
351	int i;
352	double dtime;
353
354	dtime = 0.0;
355	for (i = 0; i < CPUSTATES; i++)
356		dtime += cur.cp_time[i];
357	if (dtime == 0.0)
358		dtime = 1.0;
359	wmove(wnd, row, INSET);
360#define CPUSCALE	0.5
361	histogram(100.0 * cur.cp_time[o] / dtime, 50, CPUSCALE);
362}
363
364static void
365histogram(long double val, int colwidth, double scale)
366{
367	char buf[10];
368	int k;
369	int v = (int)(val * scale) + 0.5;
370
371	k = MIN(v, colwidth);
372	if (v > colwidth) {
373		snprintf(buf, sizeof(buf), "%5.2Lf", val);
374		k -= strlen(buf);
375		while (k--)
376			waddch(wnd, 'X');
377		waddstr(wnd, buf);
378		return;
379	}
380	while (k--)
381		waddch(wnd, 'X');
382	wclrtoeol(wnd);
383}
384
385int
386cmdiostat(const char *cmd, const char *args)
387{
388
389	if (prefix(cmd, "kbpt"))
390		kbpt = !kbpt;
391	else if (prefix(cmd, "numbers"))
392		numbers = 1;
393	else if (prefix(cmd, "bars"))
394		numbers = 0;
395	else if (!dscmd(cmd, args, 100, &cur))
396		return (0);
397	wclear(wnd);
398	labeliostat();
399	refresh();
400	return (1);
401}
402