2 * collectd - src/cpufreq.c
3 * Copyright (C) 2005 Peter Holik
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.
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.
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
20 * Peter Holik <peter at holik.at>
27 #define MODULE_NAME "cpufreq"
29 static char *cpufreq_file = "cpufreq-%s.rrd";
31 static char *ds_def[] =
33 "DS:value:GAUGE:25:0:U",
36 static int ds_num = 1;
39 static int num_cpu = 0;
44 static void cpufreq_init (void)
48 char filename[BUFSIZE];
54 status = snprintf (filename, BUFSIZE, "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_cur_freq", num_cpu);
55 if (status < 1 || status >= BUFSIZE)
58 if (access(filename, R_OK))
64 syslog (LOG_INFO, MODULE_NAME" found %d cpu(s)", num_cpu);
65 #endif /* defined(KERNEL_LINUX) */
70 static void cpufreq_write (char *host, char *inst, char *val)
75 status = snprintf (file, BUFSIZE, cpufreq_file, inst);
76 if (status < 1 || status >= BUFSIZE)
79 rrd_update_file (host, file, val, ds_def, ds_num);
82 static void cpufreq_submit (int cpu_num, unsigned long long val)
87 if (snprintf (buf, BUFSIZE, "%u:%llu", (unsigned int) curtime, val) >= BUFSIZE)
89 snprintf (cpu, 16, "%i", cpu_num);
91 plugin_submit (MODULE_NAME, cpu, buf);
94 static void cpufreq_read (void)
98 unsigned long long val;
101 char filename[BUFSIZE];
104 for (i = 0; i < num_cpu; i++)
106 status = snprintf (filename, BUFSIZE, "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_cur_freq", i);
107 if (status < 1 || status >= BUFSIZE)
110 if ((fp = fopen (filename, "r")) == NULL)
112 syslog (LOG_WARNING, "cpufreq: fopen: %s", strerror (errno));
116 if (fgets (buffer, 16, fp) == NULL)
118 syslog (LOG_WARNING, "cpufreq: fgets: %s", strerror (errno));
123 syslog (LOG_WARNING, "cpufreq: fclose: %s", strerror (errno));
125 /* You're seeing correctly: The file is reporting kHz values.. */
126 val = atoll (buffer) * 1000;
128 cpufreq_submit (i, val);
130 #endif /* defined(KERNEL_LINUX) */
136 void module_register (void)
138 plugin_register (MODULE_NAME, cpufreq_init, cpufreq_read, cpufreq_write);