iostat.c revision 368931 
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/11/usr.bin/systat/iostat.c 368931 2021-01-05 20:02:55Z mr $");
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
80static  int linesperregion;
81static  double etime;
82static  int numbers = 0;		/* default display bar graphs */
83static  int kbpt = 0;			/* default ms/seek shown */
84
85static int barlabels(int);
86static void histogram(long double, int, double);
87static int numlabels(int);
88static int devstats(int, int, int);
89static void stat1(int, int);
90
91WINDOW *
92openiostat(void)
93{
94	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
95}
96
97void
98closeiostat(WINDOW *w)
99{
100	if (w == NULL)
101		return;
102	wclear(w);
103	wrefresh(w);
104	delwin(w);
105}
106
107int
108initiostat(void)
109{
110	/*
111	 * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
112	 * how to calculate it, though.
113	 */
114	if (dsinit(7) != 1)
115		return(0);
116
117	return(1);
118}
119
120void
121fetchiostat(void)
122{
123	struct devinfo *tmp_dinfo;
124	size_t len;
125
126	len = sizeof(cur_dev.cp_time);
127	if (sysctlbyname("kern.cp_time", &cur_dev.cp_time, &len, NULL, 0)
128	    || len != sizeof(cur_dev.cp_time)) {
129		perror("kern.cp_time");
130		exit (1);
131	}
132	tmp_dinfo = last_dev.dinfo;
133	last_dev.dinfo = cur_dev.dinfo;
134	cur_dev.dinfo = tmp_dinfo;
135
136	last_dev.snap_time = cur_dev.snap_time;
137
138	/*
139	 * Here what we want to do is refresh our device stats.
140	 * getdevs() returns 1 when the device list has changed.
141	 * If the device list has changed, we want to go through
142	 * the selection process again, in case a device that we
143	 * were previously displaying has gone away.
144	 */
145	switch (devstat_getdevs(NULL, &cur_dev)) {
146	case -1:
147		errx(1, "%s", devstat_errbuf);
148		break;
149	case 1:
150		cmdiostat("refresh", NULL);
151		break;
152	default:
153		break;
154	}
155	num_devices = cur_dev.dinfo->numdevs;
156	generation = cur_dev.dinfo->generation;
157
158}
159
160#define	INSET	10
161
162void
163labeliostat(void)
164{
165	int row;
166
167	row = 0;
168	wmove(wnd, row, 0); wclrtobot(wnd);
169	mvwaddstr(wnd, row++, INSET,
170	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
171	mvwaddstr(wnd, row++, 0, "cpu  user|");
172	mvwaddstr(wnd, row++, 0, "     nice|");
173	mvwaddstr(wnd, row++, 0, "   system|");
174	mvwaddstr(wnd, row++, 0, "interrupt|");
175	mvwaddstr(wnd, row++, 0, "     idle|");
176	if (numbers)
177		row = numlabels(row + 1);
178	else
179		row = barlabels(row + 1);
180}
181
182static int
183numlabels(int row)
184{
185	int i, _col, regions, ndrives;
186	char tmpstr[10];
187
188#define COLWIDTH	17
189#define DRIVESPERLINE	((getmaxx(wnd) - 1 - INSET) / COLWIDTH)
190	for (ndrives = 0, i = 0; i < num_devices; i++)
191		if (dev_select[i].selected)
192			ndrives++;
193	regions = howmany(ndrives, DRIVESPERLINE);
194	/*
195	 * Deduct -regions for blank line after each scrolling region.
196	 */
197	linesperregion = (getmaxy(wnd) - 1 - row - regions) / regions;
198	/*
199	 * Minimum region contains space for two
200	 * label lines and one line of statistics.
201	 */
202	if (linesperregion < 3)
203		linesperregion = 3;
204	_col = INSET;
205	for (i = 0; i < num_devices; i++)
206		if (dev_select[i].selected) {
207			if (_col + COLWIDTH >= getmaxx(wnd) - 1 - INSET) {
208				_col = INSET, row += linesperregion + 1;
209				if (row > getmaxy(wnd) - 1 - (linesperregion + 1))
210					break;
211			}
212			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
213				dev_select[i].unit_number);
214			mvwaddstr(wnd, row, _col + 4, tmpstr);
215			mvwaddstr(wnd, row + 1, _col, "  KB/t tps  MB/s ");
216			_col += COLWIDTH;
217		}
218	if (_col)
219		row += linesperregion + 1;
220	return (row);
221}
222
223static int
224barlabels(int row)
225{
226	int i;
227	char tmpstr[10];
228
229	mvwaddstr(wnd, row++, INSET,
230	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
231	linesperregion = 2 + kbpt;
232	for (i = 0; i < num_devices; i++)
233		if (dev_select[i].selected) {
234			if (row > getmaxy(wnd) - 1 - linesperregion)
235				break;
236			sprintf(tmpstr, "%s%d", dev_select[i].device_name,
237				dev_select[i].unit_number);
238			mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
239				  tmpstr);
240			mvwaddstr(wnd, row++, 0, "      tps|");
241			if (kbpt)
242				mvwaddstr(wnd, row++, 0, "     KB/t|");
243		}
244	return (row);
245}
246
247void
248showiostat(void)
249{
250	long t;
251	int i, row, _col;
252
253#define X(fld)	t = cur_dev.fld[i]; cur_dev.fld[i] -= last_dev.fld[i]; last_dev.fld[i] = t
254	etime = 0;
255	for(i = 0; i < CPUSTATES; i++) {
256		X(cp_time);
257		etime += cur_dev.cp_time[i];
258	}
259	if (etime == 0.0)
260		etime = 1.0;
261	etime /= hertz;
262	row = 1;
263	for (i = 0; i < CPUSTATES; i++)
264		stat1(row++, i);
265	if (!numbers) {
266		row += 2;
267		for (i = 0; i < num_devices; i++)
268			if (dev_select[i].selected) {
269				if (row > getmaxy(wnd) - linesperregion)
270					break;
271				row = devstats(row, INSET, i);
272			}
273		return;
274	}
275	_col = INSET;
276	wmove(wnd, row + linesperregion, 0);
277	wdeleteln(wnd);
278	wmove(wnd, row + 3, 0);
279	winsertln(wnd);
280	for (i = 0; i < num_devices; i++)
281		if (dev_select[i].selected) {
282			if (_col + COLWIDTH >= getmaxx(wnd) - 1 - INSET) {
283				_col = INSET, row += linesperregion + 1;
284				if (row > getmaxy(wnd) - 1 - (linesperregion + 1))
285					break;
286				wmove(wnd, row + linesperregion, 0);
287				wdeleteln(wnd);
288				wmove(wnd, row + 3, 0);
289				winsertln(wnd);
290			}
291			(void) devstats(row + 3, _col, i);
292			_col += COLWIDTH;
293		}
294}
295
296static int
297devstats(int row, int _col, int dn)
298{
299	long double transfers_per_second;
300	long double kb_per_transfer, mb_per_second;
301	long double busy_seconds;
302	int di;
303
304	di = dev_select[dn].position;
305
306	busy_seconds = cur_dev.snap_time - last_dev.snap_time;
307
308	if (devstat_compute_statistics(&cur_dev.dinfo->devices[di],
309	    &last_dev.dinfo->devices[di], busy_seconds,
310	    DSM_KB_PER_TRANSFER, &kb_per_transfer,
311	    DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
312	    DSM_MB_PER_SECOND, &mb_per_second, DSM_NONE) != 0)
313		errx(1, "%s", devstat_errbuf);
314
315	if (numbers) {
316		mvwprintw(wnd, row, _col, " %5.2Lf %3.0Lf %5.2Lf ",
317			 kb_per_transfer, transfers_per_second,
318			 mb_per_second);
319		return(row);
320	}
321	wmove(wnd, row++, _col);
322	histogram(mb_per_second, 50, .5);
323	wmove(wnd, row++, _col);
324	histogram(transfers_per_second, 50, .5);
325	if (kbpt) {
326		wmove(wnd, row++, _col);
327		histogram(kb_per_transfer, 50, .5);
328	}
329
330	return(row);
331
332}
333
334static void
335stat1(int row, int o)
336{
337	int i;
338	double dtime;
339
340	dtime = 0.0;
341	for (i = 0; i < CPUSTATES; i++)
342		dtime += cur_dev.cp_time[i];
343	if (dtime == 0.0)
344		dtime = 1.0;
345	wmove(wnd, row, INSET);
346#define CPUSCALE	0.5
347	histogram(100.0 * cur_dev.cp_time[o] / dtime, 50, CPUSCALE);
348}
349
350static void
351histogram(long double val, int colwidth, double scale)
352{
353	char buf[10];
354	int k;
355	int v = (int)(val * scale) + 0.5;
356
357	k = MIN(v, colwidth);
358	if (v > colwidth) {
359		snprintf(buf, sizeof(buf), "%5.2Lf", val);
360		k -= strlen(buf);
361		while (k--)
362			waddch(wnd, 'X');
363		waddstr(wnd, buf);
364		return;
365	}
366	while (k--)
367		waddch(wnd, 'X');
368	wclrtoeol(wnd);
369}
370
371int
372cmdiostat(const char *cmd, const char *args)
373{
374
375	if (prefix(cmd, "kbpt"))
376		kbpt = !kbpt;
377	else if (prefix(cmd, "numbers"))
378		numbers = 1;
379	else if (prefix(cmd, "bars"))
380		numbers = 0;
381	else if (!dscmd(cmd, args, 100, &cur_dev))
382		return (0);
383	wclear(wnd);
384	labeliostat();
385	refresh();
386	return (1);
387}
388