830f8acec97402e1fb2f3962514e3a5d4d63a984
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 **/
23 #include "cpu.h"
25 #if COLLECT_CPU
26 #define MODULE_NAME "cpu"
28 #ifdef HAVE_LIBKSTAT
29 #include <sys/sysinfo.h>
30 #endif /* HAVE_LIBKSTAT */
32 #ifdef HAVE_SYSCTLBYNAME
33 #ifdef HAVE_SYS_SYSCTL_H
34 #include <sys/sysctl.h>
35 #endif
37 #ifdef HAVE_SYS_DKSTAT_H
38 #include <sys/dkstat.h>
39 #endif
41 #if !defined(CP_USER) || !defined(CP_NICE) || !defined(CP_SYS) || !defined(CP_INTR) || !defined(CP_IDLE) || !defined(CPUSTATES)
42 #define CP_USER 0
43 #define CP_NICE 1
44 #define CP_SYS 2
45 #define CP_INTR 3
46 #define CP_IDLE 4
47 #define CPUSTATES 5
48 #endif
49 #endif /* HAVE_SYSCTLBYNAME */
51 #include "plugin.h"
52 #include "common.h"
54 #ifdef HAVE_LIBKSTAT
55 /* colleague tells me that Sun doesn't sell systems with more than 100 or so CPUs.. */
56 #define MAX_NUMCPU 256
57 extern kstat_ctl_t *kc;
58 static kstat_t *ksp[MAX_NUMCPU];
59 static int numcpu;
60 #endif /* HAVE_LIBKSTAT */
62 #ifdef HAVE_SYSCTLBYNAME
63 static int numcpu;
64 #endif /* HAVE_SYSCTLBYNAME */
66 static char *cpu_filename = "cpu-%s.rrd";
68 static char *ds_def[] =
69 {
70 "DS:user:COUNTER:25:0:100",
71 "DS:nice:COUNTER:25:0:100",
72 "DS:syst:COUNTER:25:0:100",
73 "DS:idle:COUNTER:25:0:100",
74 "DS:wait:COUNTER:25:0:100",
75 NULL
76 };
77 static int ds_num = 5;
79 extern time_t curtime;
81 void cpu_init (void)
82 {
83 #ifdef HAVE_LIBKSTAT
84 kstat_t *ksp_chain;
86 numcpu = 0;
88 if (kc == NULL)
89 return;
91 /* Solaris doesn't count linear.. *sigh* */
92 for (numcpu = 0, ksp_chain = kc->kc_chain;
93 (numcpu < MAX_NUMCPU) && (ksp_chain != NULL);
94 ksp_chain = ksp_chain->ks_next)
95 if (strncmp (ksp_chain->ks_module, "cpu_stat", 8) == 0)
96 ksp[numcpu++] = ksp_chain;
97 /* #endif HAVE_LIBKSTAT */
99 #elif defined (HAVE_SYSCTLBYNAME)
100 size_t numcpu_size;
102 numcpu_size = sizeof (numcpu);
104 if (sysctlbyname ("hw.ncpu", &numcpu, &numcpu_size, NULL, 0) < 0)
105 {
106 syslog (LOG_WARNING, "cpu: sysctlbyname: %s", strerror (errno));
107 return;
108 }
110 if (numcpu != 1)
111 syslog (LOG_NOTICE, "cpu: Only one processor supported when using `sysctlbyname' (found %i)", numcpu);
112 #endif
114 return;
115 }
117 void cpu_write (char *host, char *inst, char *val)
118 {
119 char file[512];
120 int status;
122 status = snprintf (file, 512, cpu_filename, inst);
123 if (status < 1)
124 return;
125 else if (status >= 512)
126 return;
128 rrd_update_file (host, file, val, ds_def, ds_num);
129 }
131 #define BUFSIZE 512
132 void cpu_submit (int cpu_num, unsigned long long user, unsigned long long nice, unsigned long long syst,
133 unsigned long long idle, unsigned long long wait)
134 {
135 char buf[BUFSIZE];
136 char cpu[16];
138 if (snprintf (buf, BUFSIZE, "%u:%llu:%llu:%llu:%llu:%llu", (unsigned int) curtime,
139 user, nice, syst, idle, wait) >= BUFSIZE)
140 return;
141 snprintf (cpu, 16, "%i", cpu_num);
143 plugin_submit (MODULE_NAME, cpu, buf);
144 }
145 #undef BUFSIZE
147 void cpu_read (void)
148 {
149 #ifdef KERNEL_LINUX
150 #define BUFSIZE 1024
151 int cpu;
152 unsigned long long user, nice, syst, idle;
153 unsigned long long wait, intr, sitr; /* sitr == soft interrupt */
154 FILE *fh;
155 char buf[BUFSIZE];
157 char *fields[9];
158 int numfields;
160 if ((fh = fopen ("/proc/stat", "r")) == NULL)
161 {
162 syslog (LOG_WARNING, "cpu: fopen: %s", strerror (errno));
163 return;
164 }
166 while (fgets (buf, BUFSIZE, fh) != NULL)
167 {
168 if (strncmp (buf, "cpu", 3))
169 continue;
170 if ((buf[3] < '0') || (buf[3] > '9'))
171 continue;
173 numfields = strsplit (buf, fields, 9);
174 if (numfields < 5)
175 continue;
177 cpu = atoi (fields[0] + 3);
178 user = atoll (fields[1]);
179 nice = atoll (fields[2]);
180 syst = atoll (fields[3]);
181 idle = atoll (fields[4]);
183 if (numfields >= 8)
184 {
185 wait = atoll (fields[5]);
186 intr = atoll (fields[6]);
187 sitr = atoll (fields[7]);
189 /* I doubt anyone cares about the time spent in
190 * interrupt handlers.. */
191 syst += intr + sitr;
192 }
193 else
194 {
195 wait = 0LL;
196 }
198 cpu_submit (cpu, user, nice, syst, idle, wait);
199 }
201 fclose (fh);
202 #undef BUFSIZE
203 /* #endif defined(KERNEL_LINUX) */
205 #elif defined(HAVE_LIBKSTAT)
206 int cpu;
207 unsigned long long user, syst, idle, wait;
208 static cpu_stat_t cs;
210 if (kc == NULL)
211 return;
213 for (cpu = 0; cpu < numcpu; cpu++)
214 {
215 if (kstat_read (kc, ksp[cpu], &cs) == -1)
216 continue; /* error message? */
218 idle = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_IDLE];
219 user = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_USER];
220 syst = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_KERNEL];
221 wait = (unsigned long long) cs.cpu_sysinfo.cpu[CPU_WAIT];
223 cpu_submit (ksp[cpu]->ks_instance,
224 user, 0LL, syst, idle, wait);
225 }
226 /* #endif defined(HAVE_LIBKSTAT) */
228 #elif defined (HAVE_SYSCTLBYNAME)
229 long cpuinfo[CPUSTATES];
230 size_t cpuinfo_size;
232 cpuinfo_size = sizeof (cpuinfo);
234 if (sysctlbyname("kern.cp_time", &cpuinfo, &cpuinfo_size, NULL, 0) < 0)
235 {
236 syslog (LOG_WARNING, "cpu: sysctlbyname: %s", strerror (errno));
237 return;
238 }
240 cpuinfo[CP_SYS] += cpuinfo[CP_INTR];
242 /* FIXME: Instance is always `0' */
243 cpu_submit (0, cpuinfo[CP_USER], cpuinfo[CP_NICE], cpuinfo[CP_SYS], cpuinfo[CP_IDLE], 0LL);
244 #endif
245 }
247 void module_register (void)
248 {
249 plugin_register (MODULE_NAME, cpu_init, cpu_read, cpu_write);
250 }
252 #undef MODULE_NAME
253 #endif /* COLLECT_CPU */