xref: /freebsd/usr.bin/systat/iostat.c (revision fd45b686f9d92f583366c75b22c04c7ee49709c0)
1 /*
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1998 Kenneth D. Merry.
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  *    derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28  * SUCH DAMAGE.
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. Neither the name of the University nor the names of its contributors
43  *    may be used to endorse or promote products derived from this software
44  *    without specific prior written permission.
45  *
46  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
47  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
48  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
49  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
50  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
51  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
52  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
53  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
54  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
55  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
56  * SUCH DAMAGE.
57  */
58 
59 
60 
61 #include <sys/param.h>
62 #include <sys/sysctl.h>
63 #include <sys/resource.h>
64 
65 #include <devstat.h>
66 #include <err.h>
67 #include <nlist.h>
68 #include <paths.h>
69 #include <stdbool.h>
70 #include <stdlib.h>
71 #include <string.h>
72 
73 #include "systat.h"
74 #include "extern.h"
75 #include "devs.h"
76 
77 static  int linesperregion;
78 static  double etime;
79 static  bool numbers = false;		/* default display bar graphs */
80 static  bool kbpt = false;		/* default ms/seek shown */
81 
82 static int barlabels(int);
83 static void histogram(long double, int, double);
84 static int numlabels(int);
85 static int devstats(int, int, int);
86 static void stat1(int, int);
87 
88 WINDOW *
89 openiostat(void)
90 {
91 	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
92 }
93 
94 void
95 closeiostat(WINDOW *w)
96 {
97 	if (w == NULL)
98 		return;
99 	wclear(w);
100 	wrefresh(w);
101 	delwin(w);
102 }
103 
104 int
105 initiostat(void)
106 {
107 	/*
108 	 * This value for maxshowdevs (100) is bogus.  I'm not sure exactly
109 	 * how to calculate it, though.
110 	 */
111 	if (dsinit(7) != 1)
112 		return(0);
113 
114 	return(1);
115 }
116 
117 void
118 fetchiostat(void)
119 {
120 	struct devinfo *tmp_dinfo;
121 	size_t len;
122 
123 	len = sizeof(cur_dev.cp_time);
124 	if (sysctlbyname("kern.cp_time", &cur_dev.cp_time, &len, NULL, 0)
125 	    || len != sizeof(cur_dev.cp_time)) {
126 		perror("kern.cp_time");
127 		exit (1);
128 	}
129 	tmp_dinfo = last_dev.dinfo;
130 	last_dev.dinfo = cur_dev.dinfo;
131 	cur_dev.dinfo = tmp_dinfo;
132 
133 	last_dev.snap_time = cur_dev.snap_time;
134 
135 	/*
136 	 * Here what we want to do is refresh our device stats.
137 	 * getdevs() returns 1 when the device list has changed.
138 	 * If the device list has changed, we want to go through
139 	 * the selection process again, in case a device that we
140 	 * were previously displaying has gone away.
141 	 */
142 	switch (devstat_getdevs(NULL, &cur_dev)) {
143 	case -1:
144 		errx(1, "%s", devstat_errbuf);
145 		break;
146 	case 1:
147 		cmdiostat("refresh", NULL);
148 		break;
149 	default:
150 		break;
151 	}
152 	num_devices = cur_dev.dinfo->numdevs;
153 	generation = cur_dev.dinfo->generation;
154 
155 }
156 
157 #define	INSET	10
158 
159 void
160 labeliostat(void)
161 {
162 	int row;
163 
164 	row = 0;
165 	wmove(wnd, row, 0); wclrtobot(wnd);
166 	mvwaddstr(wnd, row++, INSET,
167 	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
168 	mvwaddstr(wnd, row++, 0, "cpu  user|");
169 	mvwaddstr(wnd, row++, 0, "     nice|");
170 	mvwaddstr(wnd, row++, 0, "   system|");
171 	mvwaddstr(wnd, row++, 0, "interrupt|");
172 	mvwaddstr(wnd, row++, 0, "     idle|");
173 	if (numbers)
174 		row = numlabels(row + 1);
175 	else
176 		row = barlabels(row + 1);
177 }
178 
179 static int
180 numlabels(int row)
181 {
182 	int i, _col, regions, ndrives;
183 	char tmpstr[32];
184 
185 #define COLWIDTH	17
186 #define DRIVESPERLINE	((getmaxx(wnd) - 1 - INSET) / COLWIDTH)
187 	for (ndrives = 0, i = 0; i < num_devices; i++)
188 		if (dev_select[i].selected)
189 			ndrives++;
190 	regions = howmany(ndrives, DRIVESPERLINE);
191 	/*
192 	 * Deduct -regions for blank line after each scrolling region.
193 	 */
194 	linesperregion = (getmaxy(wnd) - 1 - row - regions) / regions;
195 	/*
196 	 * Minimum region contains space for two
197 	 * label lines and one line of statistics.
198 	 */
199 	if (linesperregion < 3)
200 		linesperregion = 3;
201 	_col = INSET;
202 	for (i = 0; i < num_devices; i++)
203 		if (dev_select[i].selected) {
204 			if (_col + COLWIDTH >= getmaxx(wnd) - 1 - INSET) {
205 				_col = INSET, row += linesperregion + 1;
206 				if (row > getmaxy(wnd) - 1 - (linesperregion + 1))
207 					break;
208 			}
209 			snprintf(tmpstr, sizeof(tmpstr), "%s%d", dev_select[i].device_name,
210 				dev_select[i].unit_number);
211 			mvwaddstr(wnd, row, _col + 4, tmpstr);
212 			mvwaddstr(wnd, row + 1, _col, "  KB/t tps  MB/s ");
213 			_col += COLWIDTH;
214 		}
215 	if (_col)
216 		row += linesperregion + 1;
217 	return (row);
218 }
219 
220 static int
221 barlabels(int row)
222 {
223 	int i;
224 	char tmpstr[32];
225 
226 	mvwaddstr(wnd, row++, INSET,
227 	    "/0%  /10  /20  /30  /40  /50  /60  /70  /80  /90  /100");
228 	linesperregion = 2 + kbpt;
229 	for (i = 0; i < num_devices; i++)
230 		if (dev_select[i].selected) {
231 			if (row > getmaxy(wnd) - 1 - linesperregion)
232 				break;
233 			snprintf(tmpstr, sizeof(tmpstr), "%s%d", dev_select[i].device_name,
234 				dev_select[i].unit_number);
235 			mvwprintw(wnd, row++, 0, "%-5.5s MB/s|",
236 				  tmpstr);
237 			mvwaddstr(wnd, row++, 0, "      tps|");
238 			if (kbpt)
239 				mvwaddstr(wnd, row++, 0, "     KB/t|");
240 		}
241 	return (row);
242 }
243 
244 void
245 showiostat(void)
246 {
247 	long t;
248 	int i, row, _col;
249 
250 #define X(fld)	t = cur_dev.fld[i]; cur_dev.fld[i] -= last_dev.fld[i]; last_dev.fld[i] = t
251 	etime = 0;
252 	for(i = 0; i < CPUSTATES; i++) {
253 		X(cp_time);
254 		etime += cur_dev.cp_time[i];
255 	}
256 	if (etime == 0.0)
257 		etime = 1.0;
258 	etime /= hertz;
259 	row = 1;
260 	for (i = 0; i < CPUSTATES; i++)
261 		stat1(row++, i);
262 	if (!numbers) {
263 		row += 2;
264 		for (i = 0; i < num_devices; i++)
265 			if (dev_select[i].selected) {
266 				if (row > getmaxy(wnd) - linesperregion)
267 					break;
268 				row = devstats(row, INSET, i);
269 			}
270 		return;
271 	}
272 	_col = INSET;
273 	wmove(wnd, row + linesperregion, 0);
274 	wdeleteln(wnd);
275 	wmove(wnd, row + 3, 0);
276 	winsertln(wnd);
277 	for (i = 0; i < num_devices; i++)
278 		if (dev_select[i].selected) {
279 			if (_col + COLWIDTH >= getmaxx(wnd) - 1 - INSET) {
280 				_col = INSET, row += linesperregion + 1;
281 				if (row > getmaxy(wnd) - 1 - (linesperregion + 1))
282 					break;
283 				wmove(wnd, row + linesperregion, 0);
284 				wdeleteln(wnd);
285 				wmove(wnd, row + 3, 0);
286 				winsertln(wnd);
287 			}
288 			(void) devstats(row + 3, _col, i);
289 			_col += COLWIDTH;
290 		}
291 }
292 
293 static int
294 devstats(int row, int _col, int dn)
295 {
296 	long double transfers_per_second;
297 	long double kb_per_transfer, mb_per_second;
298 	long double busy_seconds;
299 	int di;
300 
301 	di = dev_select[dn].position;
302 
303 	busy_seconds = cur_dev.snap_time - last_dev.snap_time;
304 
305 	if (devstat_compute_statistics(&cur_dev.dinfo->devices[di],
306 	    &last_dev.dinfo->devices[di], busy_seconds,
307 	    DSM_KB_PER_TRANSFER, &kb_per_transfer,
308 	    DSM_TRANSFERS_PER_SECOND, &transfers_per_second,
309 	    DSM_MB_PER_SECOND, &mb_per_second, DSM_NONE) != 0)
310 		errx(1, "%s", devstat_errbuf);
311 
312 	if (numbers) {
313 		mvwprintw(wnd, row, _col, " %5.2Lf %3.0Lf %5.2Lf ",
314 			 kb_per_transfer, transfers_per_second,
315 			 mb_per_second);
316 		return(row);
317 	}
318 	wmove(wnd, row++, _col);
319 	histogram(mb_per_second, 50, .5);
320 	wmove(wnd, row++, _col);
321 	histogram(transfers_per_second, 50, .5);
322 	if (kbpt) {
323 		wmove(wnd, row++, _col);
324 		histogram(kb_per_transfer, 50, .5);
325 	}
326 
327 	return(row);
328 
329 }
330 
331 static void
332 stat1(int row, int o)
333 {
334 	int i;
335 	double dtime;
336 
337 	dtime = 0.0;
338 	for (i = 0; i < CPUSTATES; i++)
339 		dtime += cur_dev.cp_time[i];
340 	if (dtime == 0.0)
341 		dtime = 1.0;
342 	wmove(wnd, row, INSET);
343 #define CPUSCALE	0.5
344 	histogram(100.0 * cur_dev.cp_time[o] / dtime, 50, CPUSCALE);
345 }
346 
347 static void
348 histogram(long double val, int colwidth, double scale)
349 {
350 	char buf[10];
351 	int k;
352 	int v = (int)(val * scale) + 0.5;
353 
354 	k = MIN(v, colwidth);
355 	if (v > colwidth) {
356 		snprintf(buf, sizeof(buf), "%5.2Lf", val);
357 		k -= strlen(buf);
358 		while (k--)
359 			waddch(wnd, 'X');
360 		waddstr(wnd, buf);
361 		return;
362 	}
363 	while (k--)
364 		waddch(wnd, 'X');
365 	wclrtoeol(wnd);
366 }
367 
368 int
369 cmdiostat(const char *cmd, const char *args)
370 {
371 
372 	if (prefix(cmd, "kbpt"))
373 		kbpt = !kbpt;
374 	else if (prefix(cmd, "numbers"))
375 		numbers = true;
376 	else if (prefix(cmd, "bars"))
377 		numbers = false;
378 	else if (!dscmd(cmd, args, 100, &cur_dev))
379 		return (0);
380 	wclear(wnd);
381 	labeliostat();
382 	refresh();
383 	return (1);
384 }
385