1 /**
2 * collectd - src/xencpu.c
3 * Copyright (C) 2016 Pavel Rochnyak
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; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Pavel Rochnyak <pavel2000 ngs.ru>
20 **/
22 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
27 #include <xenctrl.h>
29 #ifdef XENCTRL_HAS_XC_INTERFACE
31 //Xen-4.1+
32 #define XC_INTERFACE_INIT_ARGS NULL,NULL,0
33 xc_interface *xc_handle;
35 #else /* XENCTRL_HAS_XC_INTERFACE */
37 //For xen-3.4/xen-4.0
38 #include <string.h>
39 #define xc_strerror(xc_interface, errcode) strerror(errcode)
40 #define XC_INTERFACE_INIT_ARGS
41 typedef int xc_interface;
42 xc_interface xc_handle = 0;
44 #endif /* XENCTRL_HAS_XC_INTERFACE */
46 uint32_t num_cpus = 0;
47 xc_cpuinfo_t *cpu_info;
48 static value_to_rate_state_t *cpu_states;
50 static int xencpu_init (void)
51 {
52 xc_handle = xc_interface_open(XC_INTERFACE_INIT_ARGS);
53 if (!xc_handle)
54 {
55 ERROR ("xencpu: xc_interface_open() failed");
56 return (-1);
57 }
59 xc_physinfo_t *physinfo;
61 physinfo = calloc(1, sizeof(xc_physinfo_t));
62 if (physinfo == NULL)
63 {
64 ERROR ("xencpu plugin: calloc() for physinfo failed.");
65 xc_interface_close(xc_handle);
66 return (ENOMEM);
67 }
69 if (xc_physinfo(xc_handle, physinfo) < 0)
70 {
71 ERROR ("xencpu plugin: xc_physinfo() failed");
72 xc_interface_close(xc_handle);
73 free(physinfo);
74 return (-1);
75 }
77 num_cpus = physinfo->nr_cpus;
78 free(physinfo);
80 INFO ("xencpu plugin: Found %"PRIu32" processors.", num_cpus);
82 cpu_info = calloc(num_cpus, sizeof(xc_cpuinfo_t));
83 if (cpu_info == NULL)
84 {
85 ERROR ("xencpu plugin: calloc() for num_cpus failed.");
86 xc_interface_close(xc_handle);
87 return (ENOMEM);
88 }
90 cpu_states = calloc (num_cpus, sizeof (value_to_rate_state_t));
91 if (cpu_states == NULL)
92 {
93 ERROR ("xencpu plugin: calloc() for cpu_states failed.");
94 xc_interface_close(xc_handle);
95 free(cpu_info);
96 return (ENOMEM);
97 }
99 return (0);
100 } /* static int xencpu_init */
102 static int xencpu_shutdown (void)
103 {
104 free(cpu_states);
105 free(cpu_info);
106 xc_interface_close(xc_handle);
108 return 0;
109 } /* static int xencpu_shutdown */
111 static void submit_value (int cpu_num, gauge_t percent)
112 {
113 value_t values[1];
114 value_list_t vl = VALUE_LIST_INIT;
116 values[0].gauge = percent;
118 vl.values = values;
119 vl.values_len = 1;
121 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
122 sstrncpy (vl.plugin, "xencpu", sizeof (vl.plugin));
123 sstrncpy (vl.type, "percent", sizeof (vl.type));
124 sstrncpy (vl.type_instance, "load", sizeof (vl.type_instance));
126 if (cpu_num >= 0) {
127 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
128 "%i", cpu_num);
129 }
130 plugin_dispatch_values (&vl);
131 } /* static void submit_value */
133 static int xencpu_read (void)
134 {
135 cdtime_t now = cdtime ();
137 int rc, nr_cpus;
139 rc = xc_getcpuinfo(xc_handle, num_cpus, cpu_info, &nr_cpus);
140 if (rc < 0) {
141 ERROR ("xencpu: xc_getcpuinfo() Failed: %d %s\n", rc, xc_strerror(xc_handle,errno));
142 return (-1);
143 }
145 int status;
146 for (int cpu = 0; cpu < nr_cpus; cpu++) {
147 gauge_t rate = NAN;
148 value_t value = {.derive = cpu_info[cpu].idletime};
150 status = value_to_rate (&rate, value, DS_TYPE_DERIVE, now, &cpu_states[cpu]);
151 if (status == 0) {
152 submit_value(cpu, 100 - rate/10000000);
153 }
154 }
156 return (0);
157 } /* static int xencpu_read */
159 void module_register (void)
160 {
161 plugin_register_init ("xencpu", xencpu_init);
162 plugin_register_read ("xencpu", xencpu_read);
163 plugin_register_shutdown ("xencpu", xencpu_shutdown);
164 } /* void module_register */