7a6227ba33c7ec24d32c83fb75718aedcfe21db7
1 /**
2 * collectd - src/cpufreq.c
3 * Copyright (C) 2005 Peter Holik
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 * Peter Holik <peter at holik.at>
21 **/
23 #include "cpufreq.h"
25 /*
26 * Originally written by Peter Holik
27 */
29 #if COLLECT_CPUFREQ
30 #define MODULE_NAME "cpufreq"
32 #include "plugin.h"
33 #include "common.h"
35 static int num_cpu = 0;
37 static char *cpufreq_file = "cpufreq-%s.rrd";
39 static char *ds_def[] =
40 {
41 "DS:value:GAUGE:25:0:U",
42 NULL
43 };
44 static int ds_num = 1;
46 extern time_t curtime;
48 #define BUFSIZE 256
50 void cpufreq_init (void)
51 {
52 int status;
53 char filename[BUFSIZE];
55 num_cpu = 0;
57 while (1)
58 {
59 status = snprintf (filename, BUFSIZE, "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_cur_freq", num_cpu);
60 if (status < 1 || status >= BUFSIZE)
61 break;
63 if (access(filename, R_OK))
64 break;
66 num_cpu++;
67 }
69 syslog (LOG_INFO, MODULE_NAME" found %d cpu(s)", num_cpu);
70 }
72 void cpufreq_write (char *host, char *inst, char *val)
73 {
74 int status;
75 char file[BUFSIZE];
77 status = snprintf (file, BUFSIZE, cpufreq_file, inst);
78 if (status < 1 || status >= BUFSIZE)
79 return;
81 rrd_update_file (host, file, val, ds_def, ds_num);
82 }
84 void cpufreq_submit (int cpu_num, unsigned long long val)
85 {
86 char buf[BUFSIZE];
87 char cpu[16];
89 if (snprintf (buf, BUFSIZE, "%u:%llu", (unsigned int) curtime, val) >= BUFSIZE)
90 return;
91 snprintf (cpu, 16, "%i", cpu_num);
93 plugin_submit (MODULE_NAME, cpu, buf);
94 }
96 void cpufreq_read (void)
97 {
98 int status;
99 unsigned long long val;
100 int i = 0;
101 FILE *fp;
102 char filename[BUFSIZE];
103 char buffer[16];
105 for (i = 0; i < num_cpu; i++)
106 {
107 status = snprintf (filename, BUFSIZE, "/sys/devices/system/cpu/cpu%d/cpufreq/cpuinfo_cur_freq", i);
108 if (status < 1 || status >= BUFSIZE)
109 return;
111 if ((fp = fopen (filename, "r")) == NULL)
112 {
113 syslog (LOG_WARNING, "cpufreq: fopen: %s", strerror (errno));
114 return;
115 }
117 if (fgets (buffer, 16, fp) == NULL)
118 {
119 syslog (LOG_WARNING, "cpufreq: fgets: %s", strerror (errno));
120 return;
121 }
123 if (fclose (fp))
124 syslog (LOG_WARNING, "cpufreq: fclose: %s", strerror (errno));
126 /* You're seeing correctly: The file is reporting kHz values.. */
127 val = atoll (buffer) * 1000;
129 cpufreq_submit (i, val);
130 }
131 }
132 #undef BUFSIZE
134 void module_register (void)
135 {
136 plugin_register (MODULE_NAME, cpufreq_init, cpufreq_read, cpufreq_write);
137 }
139 #undef MODULE_NAME
140 #endif /* COLLECT_CPUFREQ */