iostat.c revision 288163 
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 * 4. Neither the name of the University nor the names of its contributors
41 *    may be used to endorse or promote products derived from this software
42 *    without specific prior written permission.
43 *
44 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
45 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
46 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
47 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
48 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
49 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
51 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
52 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
53 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
54 * SUCH DAMAGE.
55 */
56
57#include <sys/cdefs.h>
58
59__FBSDID("$FreeBSD: stable/10/usr.bin/systat/iostat.c 288163 2015-09-24 00:50:17Z delphij $");
60
61#ifdef lint
62static const char sccsid[] = "@(#)iostat.c	8.1 (Berkeley) 6/6/93";
63#endif
64
65#include <sys/param.h>
66#include <sys/sysctl.h>
67#include <sys/resource.h>
68
69#include <devstat.h>
70#include <err.h>
71#include <nlist.h>
72#include <paths.h>
73#include <stdlib.h>
74#include <string.h>
75
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(int);
88static void histogram(long double, int, double);
89static int numlabels(int);
90static int devstats(int, int, int);
91static void stat1(int, int);
92
93WINDOW *
94openiostat(void)
95{
96	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
97}
98
99void
100closeiostat(WINDOW *w)
101{
102	if (w == NULL)
103		return;
104	wclear(w);
105	wrefresh(w);
106	delwin(w);
107}
108
109int
110initiostat(void)
111{
112	if ((num_devices = devstat_getnumdevs(NULL)) < 0)
113		return(0);
114
115	cur.dinfo = calloc(1, sizeof(struct devinfo));
116	last.dinfo = calloc(1, sizeof(struct devinfo));
117
118	/*
119	 * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
120	 * how to calculate it, though.
121	 */
122	if (dsinit(100, &cur, &last, NULL) != 1)
123		return(0);
124
125	return(1);
126}
127
128void
129fetchiostat(void)
130{
131	struct devinfo *tmp_dinfo;
132	size_t len;
133
134	len = sizeof(cur.cp_time);
135	if (sysctlbyname("kern.cp_time", &cur.cp_time, &len, NULL, 0)
136	    || len != sizeof(cur.cp_time)) {
137		perror("kern.cp_time");
138		exit (1);
139	}
140	tmp_dinfo = last.dinfo;
141	last.dinfo = cur.dinfo;
142	cur.dinfo = tmp_dinfo;
143
144	last.snap_time = cur.snap_time;
145
146	/*
147	 * Here what we want to do is refresh our device stats.
148	 * getdevs() returns 1 when the device list has changed.
149	 * If the device list has changed, we want to go through
150	 * the selection process again, in case a device that we
151	 * were previously displaying has gone away.
152	 */
153	switch (devstat_getdevs(NULL, &cur)) {
154	case -1:
155		errx(1, "%s", devstat_errbuf);
156		break;
157	case 1:
158		cmdiostat("refresh", NULL);
159		break;
160	default:
161		break;
162	}
163	num_devices = cur.dinfo->numdevs;
164	generation = cur.dinfo->generation;
165
166}
167
168#define	INSET	10
169
170void
171labeliostat(void)
172{
173	int row;
174
175	row = 0;
176	wmove(wnd, row, 0); wclrtobot(wnd);
177	mvwaddstr(wnd, row++, INSET,
178	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
179	mvwaddstr(wnd, row++, 0, "cpu  user|");
180	mvwaddstr(wnd, row++, 0, "     nice|");
181	mvwaddstr(wnd, row++, 0, "   system|");
182	mvwaddstr(wnd, row++, 0, "interrupt|");
183	mvwaddstr(wnd, row++, 0, "     idle|");
184	if (numbers)
185		row = numlabels(row + 1);
186	else
187		row = barlabels(row + 1);
188}
189
190static int
191numlabels(int row)
192{
193	int i, _col, regions, ndrives;
194	char tmpstr[10];
195
196#define COLWIDTH	17
197#define DRIVESPERLINE	((getmaxx(wnd) - 1 - INSET) / COLWIDTH)
198	for (ndrives = 0, i = 0; i < num_devices; i++)
199		if (dev_select[i].selected)
200			ndrives++;
201	regions = howmany(ndrives, DRIVESPERLINE);
202	/*
203	 * Deduct -regions for blank line after each scrolling region.
204	 */
205	linesperregion = (getmaxy(wnd) - 1 - row - regions) / regions;
206	/*
207	 * Minimum region contains space for two
208	 * label lines and one line of statistics.
209	 */
210	if (linesperregion < 3)
211		linesperregion = 3;
212	_col = INSET;
213	for (i = 0; i < num_devices; i++)
214		if (dev_select[i].selected) {
215			if (_col + COLWIDTH >= getmaxx(wnd) - 1 - INSET) {
216				_col = INSET, row += linesperregion + 1;
217				if (row > getmaxy(wnd) - 1 - (linesperregion + 1))
218					break;
219			}
220			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
221				dev_select[i].unit_number);
222			mvwaddstr(wnd, row, _col + 4, tmpstr);
223			mvwaddstr(wnd, row + 1, _col, "  KB/t tps  MB/s ");
224			_col += COLWIDTH;
225		}
226	if (_col)
227		row += linesperregion + 1;
228	return (row);
229}
230
231static int
232barlabels(int row)
233{
234	int i;
235	char tmpstr[10];
236
237	mvwaddstr(wnd, row++, INSET,
238	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
239	linesperregion = 2 + kbpt;
240	for (i = 0; i < num_devices; i++)
241		if (dev_select[i].selected) {
242			if (row > getmaxy(wnd) - 1 - linesperregion)
243				break;
244			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
245				dev_select[i].unit_number);
246			mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
247				  tmpstr);
248			mvwaddstr(wnd, row++, 0, "      tps|");
249			if (kbpt)
250				mvwaddstr(wnd, row++, 0, "     KB/t|");
251		}
252	return (row);
253}
254
255void
256showiostat(void)
257{
258	long t;
259	int i, row, _col;
260
261#define X(fld)	t = cur.fld[i]; cur.fld[i] -= last.fld[i]; last.fld[i] = t
262	etime = 0;
263	for(i = 0; i < CPUSTATES; i++) {
264		X(cp_time);
265		etime += cur.cp_time[i];
266	}
267	if (etime == 0.0)
268		etime = 1.0;
269	etime /= hertz;
270	row = 1;
271	for (i = 0; i < CPUSTATES; i++)
272		stat1(row++, i);
273	if (!numbers) {
274		row += 2;
275		for (i = 0; i < num_devices; i++)
276			if (dev_select[i].selected) {
277				if (row > getmaxy(wnd) - linesperregion)
278					break;
279				row = devstats(row, INSET, i);
280			}
281		return;
282	}
283	_col = INSET;
284	wmove(wnd, row + linesperregion, 0);
285	wdeleteln(wnd);
286	wmove(wnd, row + 3, 0);
287	winsertln(wnd);
288	for (i = 0; i < num_devices; i++)
289		if (dev_select[i].selected) {
290			if (_col + COLWIDTH >= getmaxx(wnd) - 1 - INSET) {
291				_col = INSET, row += linesperregion + 1;
292				if (row > getmaxy(wnd) - 1 - (linesperregion + 1))
293					break;
294				wmove(wnd, row + linesperregion, 0);
295				wdeleteln(wnd);
296				wmove(wnd, row + 3, 0);
297				winsertln(wnd);
298			}
299			(void) devstats(row + 3, _col, i);
300			_col += COLWIDTH;
301		}
302}
303
304static int
305devstats(int row, int _col, int dn)
306{
307	long double transfers_per_second;
308	long double kb_per_transfer, mb_per_second;
309	long double busy_seconds;
310	int di;
311
312	di = dev_select[dn].position;
313
314	busy_seconds = cur.snap_time - last.snap_time;
315
316	if (devstat_compute_statistics(&cur.dinfo->devices[di],
317	    &last.dinfo->devices[di], busy_seconds,
318	    DSM_KB_PER_TRANSFER, &kb_per_transfer,
319	    DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
320	    DSM_MB_PER_SECOND, &mb_per_second, DSM_NONE) != 0)
321		errx(1, "%s", devstat_errbuf);
322
323	if (numbers) {
324		mvwprintw(wnd, row, _col, " %5.2Lf %3.0Lf %5.2Lf ",
325			 kb_per_transfer, transfers_per_second,
326			 mb_per_second);
327		return(row);
328	}
329	wmove(wnd, row++, _col);
330	histogram(mb_per_second, 50, .5);
331	wmove(wnd, row++, _col);
332	histogram(transfers_per_second, 50, .5);
333	if (kbpt) {
334		wmove(wnd, row++, _col);
335		histogram(kb_per_transfer, 50, .5);
336	}
337
338	return(row);
339
340}
341
342static void
343stat1(int row, int o)
344{
345	int i;
346	double dtime;
347
348	dtime = 0.0;
349	for (i = 0; i < CPUSTATES; i++)
350		dtime += cur.cp_time[i];
351	if (dtime == 0.0)
352		dtime = 1.0;
353	wmove(wnd, row, INSET);
354#define CPUSCALE	0.5
355	histogram(100.0 * cur.cp_time[o] / dtime, 50, CPUSCALE);
356}
357
358static void
359histogram(long double val, int colwidth, double scale)
360{
361	char buf[10];
362	int k;
363	int v = (int)(val * scale) + 0.5;
364
365	k = MIN(v, colwidth);
366	if (v > colwidth) {
367		snprintf(buf, sizeof(buf), "%5.2Lf", val);
368		k -= strlen(buf);
369		while (k--)
370			waddch(wnd, 'X');
371		waddstr(wnd, buf);
372		return;
373	}
374	while (k--)
375		waddch(wnd, 'X');
376	wclrtoeol(wnd);
377}
378
379int
380cmdiostat(const char *cmd, const char *args)
381{
382
383	if (prefix(cmd, "kbpt"))
384		kbpt = !kbpt;
385	else if (prefix(cmd, "numbers"))
386		numbers = 1;
387	else if (prefix(cmd, "bars"))
388		numbers = 0;
389	else if (!dscmd(cmd, args, 100, &cur))
390		return (0);
391	wclear(wnd);
392	labeliostat();
393	refresh();
394	return (1);
395}
396