src/tape.c

   1 /**
   2  * collectd - src/tape.c
   3  * Copyright (C) 2005  Scott Garrett
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by the
   7  * Free Software Foundation; either version 2 of the License, or (at your
   8  * option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  18  *
  19  * Authors:
  20  *   Scott Garrett <sgarrett at technomancer.com>
  21  **/
  22
  23 #include "tape.h"
  24
  25 #if COLLECT_TAPE
  26 #define MODULE_NAME "tape"
  27
  28 #include "plugin.h"
  29 #include "common.h"
  30
  31 #if defined(HAVE_LIBKSTAT)
  32 #define MAX_NUMTAPE 256
  33 extern kstat_ctl_t *kc;
  34 static kstat_t *ksp[MAX_NUMTAPE];
  35 static int numtape = 0;
  36 #endif /* HAVE_LIBKSTAT */
  37
  38 static char *tape_filename_template = "tape-%s.rrd";
  39
  40 /* 104857600 == 100 MB */
  41 static char *tape_ds_def[] =
  42 {
  43         "DS:rcount:COUNTER:25:0:U",
  44         "DS:rmerged:COUNTER:25:0:U",
  45         "DS:rbytes:COUNTER:25:0:U",
  46         "DS:rtime:COUNTER:25:0:U",
  47         "DS:wcount:COUNTER:25:0:U",
  48         "DS:wmerged:COUNTER:25:0:U",
  49         "DS:wbytes:COUNTER:25:0:U",
  50         "DS:wtime:COUNTER:25:0:U",
  51         NULL
  52 };
  53 static int tape_ds_num = 8;
  54
  55 void tape_init (void)
  56 {
  57 #ifdef HAVE_LIBKSTAT
  58         kstat_t *ksp_chain;
  59
  60         numtape = 0;
  61
  62         if (kc == NULL)
  63                 return;
  64
  65         for (numtape = 0, ksp_chain = kc->kc_chain;
  66                         (numtape < MAX_NUMTAPE) && (ksp_chain != NULL);
  67                         ksp_chain = ksp_chain->ks_next)
  68         {
  69                 if (strncmp (ksp_chain->ks_class, "tape", 4) )
  70                         continue;
  71                 if (ksp_chain->ks_type != KSTAT_TYPE_IO)
  72                         continue;
  73                 ksp[numtape++] = ksp_chain;
  74         }
  75 #endif
  76
  77         return;
  78 }
  79
  80 void tape_write (char *host, char *inst, char *val)
  81 {
  82         char file[512];
  83         int status;
  84
  85         status = snprintf (file, 512, tape_filename_template, inst);
  86         if (status < 1)
  87                 return;
  88         else if (status >= 512)
  89                 return;
  90
  91         rrd_update_file (host, file, val, tape_ds_def, tape_ds_num);
  92 }
  93
  94
  95 #define BUFSIZE 512
  96 void tape_submit (char *tape_name,
  97                 unsigned long long read_count,
  98                 unsigned long long read_merged,
  99                 unsigned long long read_bytes,
 100                 unsigned long long read_time,
 101                 unsigned long long write_count,
 102                 unsigned long long write_merged,
 103                 unsigned long long write_bytes,
 104                 unsigned long long write_time)
 105
 106 {
 107         char buf[BUFSIZE];
 108
 109         if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu:%llu:%llu:%llu",
 110                                 (unsigned int) curtime,
 111                                 read_count, read_merged, read_bytes, read_time,
 112                                 write_count, write_merged, write_bytes,
 113                                 write_time) >= BUFSIZE)
 114                 return;
 115
 116         plugin_submit (MODULE_NAME, tape_name, buf);
 117 }
 118
 119 #undef BUFSIZE
 120
 121 void tape_read (void)
 122 {
 123
 124 #if defined(HAVE_LIBKSTAT)
 125         static kstat_io_t kio;
 126         int i;
 127
 128         if (kc == NULL)
 129                 return;
 130
 131         for (i = 0; i < numtape; i++)
 132         {
 133                 if (kstat_read (kc, ksp[i], &kio) == -1)
 134                         continue;
 135
 136                 if (strncmp (ksp[i]->ks_class, "tape", 4) == 0)
 137                         tape_submit (ksp[i]->ks_name,
 138                                         kio.reads,  0LL, kio.nread,    kio.rtime,
 139                                         kio.writes, 0LL, kio.nwritten, kio.wtime);
 140         }
 141 #endif /* defined(HAVE_LIBKSTAT) */
 142 }
 143
 144 void module_register (void)
 145 {
 146         plugin_register (MODULE_NAME, tape_init, tape_read, tape_write);
 147 }
 148
 149 #undef MODULE_NAME
 150 #endif /* COLLECT_TAPE */