iostat.c revision 1.42 
1/*	$OpenBSD: iostat.c,v 1.42 2013/07/09 15:37:43 beck Exp $	*/
2/*	$NetBSD: iostat.c,v 1.5 1996/05/10 23:16:35 thorpej Exp $	*/
3
4/*
5 * Copyright (c) 1980, 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/param.h>
34#include <sys/dkstat.h>
35#include <sys/buf.h>
36#include <sys/time.h>
37#include <sys/sysctl.h>
38#include <sys/mount.h>
39
40#include <string.h>
41#include <stdlib.h>
42#include <paths.h>
43#include "systat.h"
44
45#include "dkstats.h"
46extern struct _disk	cur, last;
47struct bcachestats	bclast, bccur;
48
49static double etime;
50
51void showtotal(void);
52void showdrive(int);
53void print_io(void);
54int read_io(void);
55int select_io(void);
56void showbcache(void);
57
58#define ATIME(x,y) ((double)x[y].tv_sec + \
59        ((double)x[y].tv_usec / (double)1000000))
60
61
62field_def fields_io[] = {
63	{"DEVICE", 8, 16, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0},
64	{"READ", 5, 8, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
65	{"WRITE", 5, 8, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
66	{"RTPS", 5, 8, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
67	{"WTPS", 5, 8, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
68	{"SEC", 5, 8, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
69	{"", 8, 19, 1, FLD_ALIGN_RIGHT, -1, 0, 0, 0},
70	{"STATS", 12, 15, 1, FLD_ALIGN_LEFT, -1, 0, 0, 0}
71};
72
73#define FLD_IO_DEVICE	FIELD_ADDR(fields_io,0)
74#define FLD_IO_READ	FIELD_ADDR(fields_io,1)
75#define FLD_IO_WRITE	FIELD_ADDR(fields_io,2)
76#define FLD_IO_RTPS	FIELD_ADDR(fields_io,3)
77#define FLD_IO_WTPS	FIELD_ADDR(fields_io,4)
78#define FLD_IO_SEC	FIELD_ADDR(fields_io,5)
79
80/* This is a hack that stuffs bcache statistics to the last two columns! */
81#define FLD_IO_SVAL	FIELD_ADDR(fields_io,6)
82#define FLD_IO_SSTR	FIELD_ADDR(fields_io,7)
83
84/* Define views */
85field_def *view_io_0[] = {
86	FLD_IO_DEVICE, FLD_IO_READ, FLD_IO_WRITE, FLD_IO_RTPS,
87	FLD_IO_WTPS, FLD_IO_SEC, FLD_IO_SVAL, FLD_IO_SSTR, NULL
88};
89
90
91/* Define view managers */
92struct view_manager iostat_mgr = {
93	"Iostat", select_io, read_io, NULL, print_header,
94	print_io, keyboard_callback, NULL, NULL
95};
96
97
98field_view views_io[] = {
99	{view_io_0, "iostat", '2', &iostat_mgr},
100	{NULL, NULL, 0, NULL}
101};
102
103
104int
105select_io(void)
106{
107	num_disp = cur.dk_ndrive + 1;
108	return (0);
109}
110
111int
112read_io(void)
113{
114	int mib[3];
115	size_t size;
116
117	dkreadstats();
118	dkswap();
119	num_disp = cur.dk_ndrive + 1;
120
121	bclast = bccur;
122	mib[0] = CTL_VFS;
123	mib[1] = VFS_GENERIC;
124	mib[2] = VFS_BCACHESTAT;
125	size = sizeof(bccur);
126
127	if (sysctl(mib, 3, &bccur, &size, NULL, 0) < 0)
128		error("cannot get vfs.bcachestat");
129
130	if (bclast.numbufs == 0)
131		bclast = bccur;
132
133	return 0;
134}
135
136
137void
138print_io(void)
139{
140	int n, count = 0;
141
142	int curr;
143	etime = naptime;
144
145	/* XXX engine internals: save and restore curr_line for bcache */
146	curr = curr_line;
147
148	for (n = dispstart; n < num_disp - 1; n++) {
149		showdrive(n);
150		count++;
151		if (maxprint > 0 && count >= maxprint)
152			break;
153	}
154
155
156	if (maxprint == 0 || count < maxprint)
157		showtotal();
158
159	curr_line = curr;
160	showbcache();
161}
162
163int
164initiostat(void)
165{
166	field_view *v;
167
168	dkinit(1);
169	dkreadstats();
170
171	bzero(&bccur, sizeof(bccur));
172
173	for (v = views_io; v->name != NULL; v++)
174		add_view(v);
175
176	return(1);
177}
178
179void
180showtotal(void)
181{
182	double rsum, wsum, rtsum, wtsum, mssum;
183	int dn;
184
185	rsum = wsum = rtsum = wtsum = mssum = 0.0;
186
187	for (dn = 0; dn < cur.dk_ndrive; dn++) {
188		rsum += cur.dk_rbytes[dn] / etime;
189		wsum += cur.dk_wbytes[dn] / etime;
190		rtsum += cur.dk_rxfer[dn] / etime;
191		wtsum += cur.dk_wxfer[dn] / etime;
192		mssum += ATIME(cur.dk_time, dn) / etime;
193	}
194
195	print_fld_str(FLD_IO_DEVICE, "Totals");
196	print_fld_size(FLD_IO_READ, rsum);
197	print_fld_size(FLD_IO_WRITE, wsum);
198	print_fld_size(FLD_IO_RTPS, rtsum);
199	print_fld_size(FLD_IO_WTPS, wtsum);
200	print_fld_float(FLD_IO_SEC, mssum, 1);
201
202	end_line();
203}
204
205void
206showdrive(int dn)
207{
208	print_fld_str(FLD_IO_DEVICE, cur.dk_name[dn]);
209	print_fld_size(FLD_IO_READ, cur.dk_rbytes[dn]/etime);
210	print_fld_size(FLD_IO_WRITE, cur.dk_wbytes[dn]/ etime);
211	print_fld_size(FLD_IO_RTPS, cur.dk_rxfer[dn] / etime);
212	print_fld_size(FLD_IO_WTPS, cur.dk_wxfer[dn] / etime);
213	print_fld_float(FLD_IO_SEC, ATIME(cur.dk_time, dn) / etime, 1);
214
215	end_line();
216}
217
218void
219showbcache(void)
220{
221	print_fld_str(FLD_IO_SSTR, "total pages");
222	print_fld_ssize(FLD_IO_SVAL, bccur.numbufpages);
223	end_line();
224
225	print_fld_str(FLD_IO_SSTR, "dirty pages");
226	print_fld_ssize(FLD_IO_SVAL, bccur.numdirtypages);
227	end_line();
228
229	print_fld_str(FLD_IO_SSTR, "delwri bufs");
230	print_fld_ssize(FLD_IO_SVAL, bccur.delwribufs);
231	end_line();
232
233	print_fld_str(FLD_IO_SSTR, "busymap bufs");
234	print_fld_ssize(FLD_IO_SVAL, bccur.busymapped);
235	end_line();
236
237	print_fld_str(FLD_IO_SSTR, "avail kvaslots");
238	print_fld_ssize(FLD_IO_SVAL, bccur.kvaslots_avail);
239	end_line();
240
241	print_fld_str(FLD_IO_SSTR, "kvaslots");
242	print_fld_ssize(FLD_IO_SVAL, bccur.kvaslots);
243	end_line();
244
245	print_fld_str(FLD_IO_SSTR, "pending writes");
246	print_fld_ssize(FLD_IO_SVAL, bccur.pendingwrites);
247	end_line();
248
249	print_fld_str(FLD_IO_SSTR, "pending reads");
250	print_fld_ssize(FLD_IO_SVAL, bccur.pendingreads);
251	end_line();
252
253	print_fld_str(FLD_IO_SSTR, "cache hits");
254	print_fld_ssize(FLD_IO_SVAL, bccur.cachehits - bclast.cachehits);
255	end_line();
256}
257