src/cpu.c

   1 /**
   2  * collectd - src/cpu.c
   3  * Copyright (C) 2005,2006  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 #if HAVE_MACH_MACH_ERROR_H
  40 #  include <mach/mach_error.h>
  41 #endif
  42 #ifdef HAVE_MACH_PROCESSOR_INFO_H
  43 # include <mach/processor_info.h>
  44 #endif
  45 #ifdef HAVE_MACH_PROCESSOR_H
  46 # include <mach/processor.h>
  47 #endif
  48 #ifdef HAVE_MACH_VM_MAP_H
  49 # include <mach/vm_map.h>
  50 #endif
  51
  52 #ifdef HAVE_LIBKSTAT
  53 # include <sys/sysinfo.h>
  54 #endif /* HAVE_LIBKSTAT */
  55
  56 #ifdef HAVE_SYSCTLBYNAME
  57 # ifdef HAVE_SYS_SYSCTL_H
  58 #  include <sys/sysctl.h>
  59 # endif
  60
  61 # ifdef HAVE_SYS_DKSTAT_H
  62 #  include <sys/dkstat.h>
  63 # endif
  64
  65 # if !defined(CP_USER) || !defined(CP_NICE) || !defined(CP_SYS) || !defined(CP_INTR) || !defined(CP_IDLE) || !defined(CPUSTATES)
  66 #  define CP_USER   0
  67 #  define CP_NICE   1
  68 #  define CP_SYS    2
  69 #  define CP_INTR   3
  70 #  define CP_IDLE   4
  71 #  define CPUSTATES 5
  72 # endif
  73 #endif /* HAVE_SYSCTLBYNAME */
  74
  75 #if defined(PROCESSOR_CPU_LOAD_INFO) || defined(KERNEL_LINUX) || defined(HAVE_LIBKSTAT) || defined(HAVE_SYSCTLBYNAME)
  76 # define CPU_HAVE_READ 1
  77 #else
  78 # define CPU_HAVE_READ 0
  79 #endif
  80
  81 #ifdef PROCESSOR_CPU_LOAD_INFO
  82 static mach_port_t port_host;
  83 static processor_port_array_t cpu_list;
  84 static mach_msg_type_number_t cpu_list_len;
  85 /* #endif PROCESSOR_CPU_LOAD_INFO */
  86
  87 #elif defined(KERNEL_LINUX)
  88 /* no variables needed */
  89 /* #endif KERNEL_LINUX */
  90
  91 #elif defined(HAVE_LIBKSTAT)
  92 /* colleague tells me that Sun doesn't sell systems with more than 100 or so CPUs.. */
  93 # define MAX_NUMCPU 256
  94 extern kstat_ctl_t *kc;
  95 static kstat_t *ksp[MAX_NUMCPU];
  96 static int numcpu;
  97 /* #endif HAVE_LIBKSTAT */
  98
  99 #elif defined(HAVE_SYSCTLBYNAME)
 100 static int numcpu;
 101 #endif /* HAVE_SYSCTLBYNAME */
 102
 103 static char *cpu_filename = "cpu-%s.rrd";
 104
 105 static char *ds_def[] =
 106 {
 107         "DS:user:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 108         "DS:nice:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 109         "DS:syst:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 110         "DS:idle:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 111         "DS:wait:COUNTER:"COLLECTD_HEARTBEAT":0:U",
 112         NULL
 113 };
 114 static int ds_num = 5;
 115
 116 static void cpu_init (void)
 117 {
 118 #if PROCESSOR_CPU_LOAD_INFO || PROCESSOR_TEMPERATURE
 119         kern_return_t status;
 120
 121         port_host = mach_host_self ();
 122
 123         /* FIXME: Free `cpu_list' if it's not NULL */
 124         if ((status = host_processors (port_host, &cpu_list, &cpu_list_len)) != KERN_SUCCESS)
 125         {
 126                 syslog (LOG_ERR, "cpu-plugin: host_processors returned %i\n", (int) status);
 127                 cpu_list_len = 0;
 128                 return;
 129         }
 130
 131         DBG ("host_processors returned %i %s", (int) cpu_list_len, cpu_list_len == 1 ? "processor" : "processors");
 132         syslog (LOG_INFO, "cpu-plugin: Found %i processor%s.", (int) cpu_list_len, cpu_list_len == 1 ? "" : "s");
 133 /* #endif PROCESSOR_CPU_LOAD_INFO */
 134
 135 #elif defined(HAVE_LIBKSTAT)
 136         kstat_t *ksp_chain;
 137
 138         numcpu = 0;
 139
 140         if (kc == NULL)
 141                 return;
 142
 143         /* Solaris doesn't count linear.. *sigh* */
 144         for (numcpu = 0, ksp_chain = kc->kc_chain;
 145                         (numcpu < MAX_NUMCPU) && (ksp_chain != NULL);
 146                         ksp_chain = ksp_chain->ks_next)
 147                 if (strncmp (ksp_chain->ks_module, "cpu_stat", 8) == 0)
 148                         ksp[numcpu++] = ksp_chain;
 149 /* #endif HAVE_LIBKSTAT */
 150
 151 #elif defined (HAVE_SYSCTLBYNAME)
 152         size_t numcpu_size;
 153
 154         numcpu_size = sizeof (numcpu);
 155
 156         if (sysctlbyname ("hw.ncpu", &numcpu, &numcpu_size, NULL, 0) < 0)
 157         {
 158                 syslog (LOG_WARNING, "cpu: sysctlbyname: %s", strerror (errno));
 159                 return;
 160         }
 161
 162         if (numcpu != 1)
 163                 syslog (LOG_NOTICE, "cpu: Only one processor supported when using `sysctlbyname' (found %i)", numcpu);
 164 #endif
 165
 166         return;
 167 }
 168
 169 static void cpu_write (char *host, char *inst, char *val)
 170 {
 171         char file[512];
 172         int status;
 173
 174         status = snprintf (file, 512, cpu_filename, inst);
 175         if (status < 1)
 176                 return;
 177         else if (status >= 512)
 178                 return;
 179
 180         rrd_update_file (host, file, val, ds_def, ds_num);
 181 }
 182
 183 #if CPU_HAVE_READ
 184 #define BUFSIZE 512
 185 static void cpu_submit (int cpu_num, unsigned long long user,
 186                 unsigned long long nice, unsigned long long syst,
 187                 unsigned long long idle, unsigned long long wait)
 188 {
 189         char buf[BUFSIZE];
 190         char cpu[16];
 191
 192         if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu", (unsigned int) curtime,
 193                                 user, nice, syst, idle, wait) >= BUFSIZE)
 194                 return;
 195         snprintf (cpu, 16, "%i", cpu_num);
 196
 197         plugin_submit (MODULE_NAME, cpu, buf);
 198 }
 199 #undef BUFSIZE
 200
 201 static void cpu_read (void)
 202 {
 203 #if PROCESSOR_CPU_LOAD_INFO || PROCESSOR_TEMPERATURE
 204         int cpu;
 205
 206         kern_return_t status;
 207
 208 #if PROCESSOR_CPU_LOAD_INFO
 209         processor_cpu_load_info_data_t cpu_info;
 210         mach_msg_type_number_t         cpu_info_len;
 211 #endif
 212 #if PROCESSOR_TEMPERATURE
 213         processor_info_data_t          cpu_temp;
 214         mach_msg_type_number_t         cpu_temp_len;
 215 #endif
 216
 217         host_t cpu_host;
 218
 219         for (cpu = 0; cpu < cpu_list_len; cpu++)
 220         {
 221 #if PROCESSOR_CPU_LOAD_INFO
 222                 cpu_host = 0;
 223                 cpu_info_len = PROCESSOR_BASIC_INFO_COUNT;
 224
 225                 if ((status = processor_info (cpu_list[cpu],
 226                                                 PROCESSOR_CPU_LOAD_INFO, &cpu_host,
 227                                                 (processor_info_t) &cpu_info, &cpu_info_len)) != KERN_SUCCESS)
 228                 {
 229                         syslog (LOG_ERR, "processor_info failed with status %i\n", (int) status);
 230                         continue;
 231                 }
 232
 233                 if (cpu_info_len < CPU_STATE_MAX)
 234                 {
 235                         syslog (LOG_ERR, "processor_info returned only %i elements..\n", cpu_info_len);
 236                         continue;
 237                 }
 238
 239                 cpu_submit (cpu, cpu_info.cpu_ticks[CPU_STATE_USER],
 240                                 cpu_info.cpu_ticks[CPU_STATE_NICE],
 241                                 cpu_info.cpu_ticks[CPU_STATE_SYSTEM],
 242                                 cpu_info.cpu_ticks[CPU_STATE_IDLE],
 243                                 0ULL);
 244 #endif /* PROCESSOR_CPU_LOAD_INFO */
 245 #if PROCESSOR_TEMPERATURE
 246                 cpu_temp_len = PROCESSOR_INFO_MAX;
 247
 248                 status = processor_info (cpu_list[cpu],
 249                                 PROCESSOR_TEMPERATURE,
 250                                 &cpu_host,
 251                                 cpu_temp, &cpu_temp_len);
 252                 if (status != KERN_SUCCESS)
 253                 {
 254                         syslog (LOG_ERR, "processor_info failed: %s",
 255                                         mach_error_string (status));
 256                         continue;
 257                 }
 258
 259                 if (cpu_temp_len != 1)
 260                 {
 261                         DBG ("processor_info (PROCESSOR_TEMPERATURE) returned %i elements..?",
 262                                         (int) cpu_temp_len);
 263                         continue;
 264                 }
 265
 266                 DBG ("cpu_temp = %i", (int) cpu_temp);
 267 #endif /* PROCESSOR_TEMPERATURE */
 268         }
 269 /* #endif PROCESSOR_CPU_LOAD_INFO */
 270
 271 #elif defined(KERNEL_LINUX)
 272 # define BUFSIZE 1024
 273         int cpu;
 274         unsigned long long user, nice, syst, idle;
 275         unsigned long long wait, intr, sitr; /* sitr == soft interrupt */
 276         FILE *fh;
 277         char buf[BUFSIZE];
 278
 279         char *fields[9];
 280         int numfields;
 281
 282         if ((fh = fopen ("/proc/stat", "r")) == NULL)
 283         {
 284                 syslog (LOG_WARNING, "cpu: fopen: %s", strerror (errno));
 285                 return;
 286         }
 287
 288         while (fgets (buf, BUFSIZE, fh) != NULL)
 289         {
 290                 if (strncmp (buf, "cpu", 3))
 291                         continue;
 292                 if ((buf[3] < '0') || (buf[3] > '9'))
 293                         continue;
 294
 295                 numfields = strsplit (buf, fields, 9);
 296                 if (numfields < 5)
 297                         continue;
 298
 299                 cpu = atoi (fields[0] + 3);
 300                 user = atoll (fields[1]);
 301                 nice = atoll (fields[2]);
 302                 syst = atoll (fields[3]);
 303                 idle = atoll (fields[4]);
 304
 305                 if (numfields >= 8)
 306                 {
 307                         wait = atoll (fields[5]);
 308                         intr = atoll (fields[6]);
 309                         sitr = atoll (fields[7]);
 310
 311                         /* I doubt anyone cares about the time spent in
 312                          * interrupt handlers.. */
 313                         syst += intr + sitr;
 314                 }
 315                 else
 316                 {
 317                         wait = 0LL;
 318                 }
 319
 320                 cpu_submit (cpu, user, nice, syst, idle, wait);
 321         }
 322
 323         fclose (fh);
 324 #undef BUFSIZE
 325 /* #endif defined(KERNEL_LINUX) */
 326
 327 #elif defined(HAVE_LIBKSTAT)
 328         int cpu;
 329         unsigned long long user, syst, idle, wait;
 330         static cpu_stat_t cs;
 331
 332         if (kc == NULL)
 333                 return;
 334
 335         for (cpu = 0; cpu < numcpu; cpu++)
 336         {
 337                 if (kstat_read (kc, ksp[cpu], &cs) == -1)
 338                         continue; /* error message? */
 339
 340                 idle = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_IDLE];
 341                 user = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_USER];
 342                 syst = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_KERNEL];
 343                 wait = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_WAIT];
 344
 345                 cpu_submit (ksp[cpu]->ks_instance,
 346                                 user, 0LL, syst, idle, wait);
 347         }
 348 /* #endif defined(HAVE_LIBKSTAT) */
 349
 350 #elif defined(HAVE_SYSCTLBYNAME)
 351         long cpuinfo[CPUSTATES];
 352         size_t cpuinfo_size;
 353
 354         cpuinfo_size = sizeof (cpuinfo);
 355
 356         if (sysctlbyname("kern.cp_time", &cpuinfo, &cpuinfo_size, NULL, 0) < 0)
 357         {
 358                 syslog (LOG_WARNING, "cpu: sysctlbyname: %s", strerror (errno));
 359                 return;
 360         }
 361
 362         cpuinfo[CP_SYS] += cpuinfo[CP_INTR];
 363
 364         /* FIXME: Instance is always `0' */
 365         cpu_submit (0, cpuinfo[CP_USER], cpuinfo[CP_NICE], cpuinfo[CP_SYS], cpuinfo[CP_IDLE], 0LL);
 366 #endif
 367
 368         return;
 369 }
 370 #else
 371 # define cpu_read NULL
 372 #endif /* CPU_HAVE_READ */
 373
 374 void module_register (void)
 375 {
 376         plugin_register (MODULE_NAME, cpu_init, cpu_read, cpu_write);
 377 }
 378
 379 #undef MODULE_NAME