iostat.c revision 1.39
1/* $OpenBSD: iostat.c,v 1.39 2011/07/06 00:11:57 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, "dma pages"); 226 print_fld_ssize(FLD_IO_SVAL, bccur.dmapages); 227 end_line(); 228 229 print_fld_str(FLD_IO_SSTR, "dirty pages"); 230 print_fld_ssize(FLD_IO_SVAL, bccur.numdirtypages); 231 end_line(); 232 233 print_fld_str(FLD_IO_SSTR, "pending writes"); 234 print_fld_ssize(FLD_IO_SVAL, bccur.pendingwrites); 235 end_line(); 236 237 print_fld_str(FLD_IO_SSTR, "pending reads"); 238 print_fld_ssize(FLD_IO_SVAL, bccur.pendingreads); 239 end_line(); 240 241 print_fld_str(FLD_IO_SSTR, "cache hits"); 242 print_fld_ssize(FLD_IO_SVAL, bccur.cachehits - bclast.cachehits); 243 end_line(); 244} 245