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