src/cpu.c

   1 /**
   2  * collectd - src/cpu.c
   3  * Copyright (C) 2005  Florian octo Forster
   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  *   Florian octo Forster <octo at verplant.org>
  21  **/
  22
  23 #include "collectd.h"
  24 #include "common.h"
  25 #include "plugin.h"
  26 #include "utils_debug.h"
  27
  28 #define MODULE_NAME "cpu"
  29
  30 #ifdef HAVE_MACH_KERN_RETURN_H
  31 # include <mach/kern_return.h>
  32 #endif
  33 #ifdef HAVE_MACH_MACH_INIT_H
  34 # include <mach/mach_init.h>
  35 #endif
  36 #ifdef HAVE_MACH_HOST_PRIV_H
  37 # include <mach/host_priv.h>
  38 #endif
  39 #ifdef HAVE_MACH_PROCESSOR_INFO_H
  40 # include <mach/processor_info.h>
  41 #endif
  42 #ifdef HAVE_MACH_PROCESSOR_H
  43 # include <mach/processor.h>
  44 #endif
  45
  46 #ifdef HAVE_LIBKSTAT
  47 # include <sys/sysinfo.h>
  48 #endif /* HAVE_LIBKSTAT */
  49
  50 #ifdef HAVE_SYSCTLBYNAME
  51 # ifdef HAVE_SYS_SYSCTL_H
  52 #  include <sys/sysctl.h>
  53 # endif
  54
  55 # ifdef HAVE_SYS_DKSTAT_H
  56 #  include <sys/dkstat.h>
  57 # endif
  58
  59 # if !defined(CP_USER) || !defined(CP_NICE) || !defined(CP_SYS) || !defined(CP_INTR) || !defined(CP_IDLE) || !defined(CPUSTATES)
  60 #  define CP_USER   0
  61 #  define CP_NICE   1
  62 #  define CP_SYS    2
  63 #  define CP_INTR   3
  64 #  define CP_IDLE   4
  65 #  define CPUSTATES 5
  66 # endif
  67 #endif /* HAVE_SYSCTLBYNAME */
  68
  69 #if defined(PROCESSOR_CPU_LOAD_INFO) || defined(KERNEL_LINUX) || defined(HAVE_LIBKSTAT) || defined(HAVE_SYSCTLBYNAME)
  70 # define CPU_HAVE_READ 1
  71 #else
  72 # define CPU_HAVE_READ 0
  73 #endif
  74
  75 #ifdef PROCESSOR_CPU_LOAD_INFO
  76 static mach_port_t port_host;
  77 static processor_port_array_t cpu_list;
  78 static mach_msg_type_number_t cpu_list_len;
  79 /* #endif PROCESSOR_CPU_LOAD_INFO */
  80
  81 #elif defined(KERNEL_LINUX)
  82 /* no variables needed */
  83 /* #endif KERNEL_LINUX */
  84
  85 #elif defined(HAVE_LIBKSTAT)
  86 /* colleague tells me that Sun doesn't sell systems with more than 100 or so CPUs.. */
  87 # define MAX_NUMCPU 256
  88 extern kstat_ctl_t *kc;
  89 static kstat_t *ksp[MAX_NUMCPU];
  90 static int numcpu;
  91 /* #endif HAVE_LIBKSTAT */
  92
  93 #elif defined(HAVE_SYSCTLBYNAME)
  94 static int numcpu;
  95 #endif /* HAVE_SYSCTLBYNAME */
  96
  97 static char *cpu_filename = "cpu-%s.rrd";
  98
  99 static char *ds_def[] =
 100 {
 101         "DS:user:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 102         "DS:nice:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 103         "DS:syst:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 104         "DS:idle:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 105         "DS:wait:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 106         NULL
 107 };
 108 static int ds_num = 5;
 109
 110 static void cpu_init (void)
 111 {
 112 #ifdef PROCESSOR_CPU_LOAD_INFO
 113         kern_return_t status;
 114
 115         port_host = mach_host_self ();
 116
 117         if ((status = host_processors (port_host, &cpu_list, &cpu_list_len)) != KERN_SUCCESS)
 118         {
 119                 syslog (LOG_ERR, "cpu-plugin: host_processors returned %i\n", (int) status);
 120                 cpu_list_len = 0;
 121                 return;
 122         }
 123
 124         DBG ("host_processors returned %i %s", (int) cpu_list_len, cpu_list_len == 1 ? "processor" : "processors");
 125         syslog (LOG_INFO, "cpu-plugin: Found %i processor%s.", (int) cpu_list_len, cpu_list_len == 1 ? "" : "s");
 126 /* #endif PROCESSOR_CPU_LOAD_INFO */
 127
 128 #elif defined(HAVE_LIBKSTAT)
 129         kstat_t *ksp_chain;
 130
 131         numcpu = 0;
 132
 133         if (kc == NULL)
 134                 return;
 135
 136         /* Solaris doesn't count linear.. *sigh* */
 137         for (numcpu = 0, ksp_chain = kc->kc_chain;
 138                         (numcpu < MAX_NUMCPU) && (ksp_chain != NULL);
 139                         ksp_chain = ksp_chain->ks_next)
 140                 if (strncmp (ksp_chain->ks_module, "cpu_stat", 8) == 0)
 141                         ksp[numcpu++] = ksp_chain;
 142 /* #endif HAVE_LIBKSTAT */
 143
 144 #elif defined (HAVE_SYSCTLBYNAME)
 145         size_t numcpu_size;
 146
 147         numcpu_size = sizeof (numcpu);
 148
 149         if (sysctlbyname ("hw.ncpu", &numcpu, &numcpu_size, NULL, 0) < 0)
 150         {
 151                 syslog (LOG_WARNING, "cpu: sysctlbyname: %s", strerror (errno));
 152                 return;
 153         }
 154
 155         if (numcpu != 1)
 156                 syslog (LOG_NOTICE, "cpu: Only one processor supported when using `sysctlbyname' (found %i)", numcpu);
 157 #endif
 158
 159         return;
 160 }
 161
 162 static void cpu_write (char *host, char *inst, char *val)
 163 {
 164         char file[512];
 165         int status;
 166
 167         status = snprintf (file, 512, cpu_filename, inst);
 168         if (status < 1)
 169                 return;
 170         else if (status >= 512)
 171                 return;
 172
 173         rrd_update_file (host, file, val, ds_def, ds_num);
 174 }
 175
 176 #if CPU_HAVE_READ
 177 #define BUFSIZE 512
 178 static void cpu_submit (int cpu_num, unsigned long long user,
 179                 unsigned long long nice, unsigned long long syst,
 180                 unsigned long long idle, unsigned long long wait)
 181 {
 182         char buf[BUFSIZE];
 183         char cpu[16];
 184
 185         if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu", (unsigned int) curtime,
 186                                 user, nice, syst, idle, wait) >= BUFSIZE)
 187                 return;
 188         snprintf (cpu, 16, "%i", cpu_num);
 189
 190         plugin_submit (MODULE_NAME, cpu, buf);
 191 }
 192 #undef BUFSIZE
 193
 194 static void cpu_read (void)
 195 {
 196 #ifdef PROCESSOR_CPU_LOAD_INFO
 197         int cpu;
 198
 199         kern_return_t status;
 200
 201         processor_cpu_load_info_data_t cpu_info;
 202         processor_cpu_load_info_t      cpu_info_ptr;
 203         mach_msg_type_number_t         cpu_info_len;
 204
 205         host_t cpu_host;
 206
 207         for (cpu = 0; cpu < cpu_list_len; cpu++)
 208         {
 209                 cpu_host = 0;
 210                 cpu_info_ptr = &cpu_info;
 211                 cpu_info_len = sizeof (cpu_info);
 212
 213                 if ((status = processor_info (cpu_list[cpu],
 214                                                 PROCESSOR_CPU_LOAD_INFO, &cpu_host,
 215                                                 (processor_info_t) cpu_info_ptr, &cpu_info_len)) != KERN_SUCCESS)
 216                 {
 217                         syslog (LOG_ERR, "processor_info failed with status %i\n", (int) status);
 218                         continue;
 219                 }
 220
 221                 if (cpu_info_len < CPU_STATE_MAX)
 222                 {
 223                         syslog (LOG_ERR, "processor_info returned only %i elements..\n", cpu_info_len);
 224                         continue;
 225                 }
 226
 227                 cpu_submit (cpu, cpu_info.cpu_ticks[CPU_STATE_USER],
 228                                 cpu_info.cpu_ticks[CPU_STATE_NICE],
 229                                 cpu_info.cpu_ticks[CPU_STATE_SYSTEM],
 230                                 cpu_info.cpu_ticks[CPU_STATE_IDLE],
 231                                 0ULL);
 232         }
 233 /* #endif PROCESSOR_CPU_LOAD_INFO */
 234
 235 #elif defined(KERNEL_LINUX)
 236 # define BUFSIZE 1024
 237         int cpu;
 238         unsigned long long user, nice, syst, idle;
 239         unsigned long long wait, intr, sitr; /* sitr == soft interrupt */
 240         FILE *fh;
 241         char buf[BUFSIZE];
 242
 243         char *fields[9];
 244         int numfields;
 245
 246         if ((fh = fopen ("/proc/stat", "r")) == NULL)
 247         {
 248                 syslog (LOG_WARNING, "cpu: fopen: %s", strerror (errno));
 249                 return;
 250         }
 251
 252         while (fgets (buf, BUFSIZE, fh) != NULL)
 253         {
 254                 if (strncmp (buf, "cpu", 3))
 255                         continue;
 256                 if ((buf[3] < '0') || (buf[3] > '9'))
 257                         continue;
 258
 259                 numfields = strsplit (buf, fields, 9);
 260                 if (numfields < 5)
 261                         continue;
 262
 263                 cpu = atoi (fields[0] + 3);
 264                 user = atoll (fields[1]);
 265                 nice = atoll (fields[2]);
 266                 syst = atoll (fields[3]);
 267                 idle = atoll (fields[4]);
 268
 269                 if (numfields >= 8)
 270                 {
 271                         wait = atoll (fields[5]);
 272                         intr = atoll (fields[6]);
 273                         sitr = atoll (fields[7]);
 274
 275                         /* I doubt anyone cares about the time spent in
 276                          * interrupt handlers.. */
 277                         syst += intr + sitr;
 278                 }
 279                 else
 280                 {
 281                         wait = 0LL;
 282                 }
 283
 284                 cpu_submit (cpu, user, nice, syst, idle, wait);
 285         }
 286
 287         fclose (fh);
 288 #undef BUFSIZE
 289 /* #endif defined(KERNEL_LINUX) */
 290
 291 #elif defined(HAVE_LIBKSTAT)
 292         int cpu;
 293         unsigned long long user, syst, idle, wait;
 294         static cpu_stat_t cs;
 295
 296         if (kc == NULL)
 297                 return;
 298
 299         for (cpu = 0; cpu < numcpu; cpu++)
 300         {
 301                 if (kstat_read (kc, ksp[cpu], &cs) == -1)
 302                         continue; /* error message? */
 303
 304                 idle = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_IDLE];
 305                 user = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_USER];
 306                 syst = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_KERNEL];
 307                 wait = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_WAIT];
 308
 309                 cpu_submit (ksp[cpu]->ks_instance,
 310                                 user, 0LL, syst, idle, wait);
 311         }
 312 /* #endif defined(HAVE_LIBKSTAT) */
 313
 314 #elif defined(HAVE_SYSCTLBYNAME)
 315         long cpuinfo[CPUSTATES];
 316         size_t cpuinfo_size;
 317
 318         cpuinfo_size = sizeof (cpuinfo);
 319
 320         if (sysctlbyname("kern.cp_time", &cpuinfo, &cpuinfo_size, NULL, 0) < 0)
 321         {
 322                 syslog (LOG_WARNING, "cpu: sysctlbyname: %s", strerror (errno));
 323                 return;
 324         }
 325
 326         cpuinfo[CP_SYS] += cpuinfo[CP_INTR];
 327
 328         /* FIXME: Instance is always `0' */
 329         cpu_submit (0, cpuinfo[CP_USER], cpuinfo[CP_NICE], cpuinfo[CP_SYS], cpuinfo[CP_IDLE], 0LL);
 330 #endif
 331
 332         return;
 333 }
 334 #else
 335 # define cpu_read NULL
 336 #endif /* CPU_HAVE_READ */
 337
 338 void module_register (void)
 339 {
 340         plugin_register (MODULE_NAME, cpu_init, cpu_read, cpu_write);
 341 }
 342
 343 #undef MODULE_NAME