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"
23 #include "common.h"
24 #include "plugin.h"
26 #include <xenctrl.h>
28 #ifdef XENCTRL_HAS_XC_INTERFACE
30 //Xen-4.1+
31 #define XC_INTERFACE_INIT_ARGS NULL,NULL,0
32 xc_interface *xc_handle;
34 #else /* XENCTRL_HAS_XC_INTERFACE */
36 //For xen-3.4/xen-4.0
37 #include <string.h>
38 #define xc_strerror(xc_interface, errcode) strerror(errcode)
39 #define XC_INTERFACE_INIT_ARGS
40 typedef int xc_interface;
41 xc_interface xc_handle = 0;
43 #endif /* XENCTRL_HAS_XC_INTERFACE */
45 uint32_t num_cpus = 0;
46 xc_cpuinfo_t *cpu_info;
47 static value_to_rate_state_t *cpu_states;
49 static int xencpu_init (void)
50 {
51 xc_handle = xc_interface_open(XC_INTERFACE_INIT_ARGS);
52 if (!xc_handle)
53 {
54 ERROR ("xencpu: xc_interface_open() failed");
55 return (-1);
56 };
58 xc_physinfo_t *physinfo;
60 physinfo = calloc(1, sizeof(xc_physinfo_t));
61 if (physinfo == NULL)
62 {
63 ERROR ("xencpu plugin: calloc() for physinfo failed.");
64 xc_interface_close(xc_handle);
65 return (ENOMEM);
66 }
68 if (xc_physinfo(xc_handle, physinfo) < 0)
69 {
70 ERROR ("xencpu plugin: xc_physinfo() failed");
71 xc_interface_close(xc_handle);
72 free(physinfo);
73 return (-1);
74 };
76 num_cpus = physinfo->nr_cpus;
77 free(physinfo);
79 INFO ("xencpu plugin: Found %"PRIu32" processors.", num_cpus);
81 cpu_info = calloc(num_cpus, sizeof(xc_cpuinfo_t));
82 if (cpu_info == NULL)
83 {
84 ERROR ("xencpu plugin: calloc() for num_cpus failed.");
85 xc_interface_close(xc_handle);
86 return (ENOMEM);
87 }
89 cpu_states = calloc (num_cpus, sizeof (value_to_rate_state_t));
90 if (cpu_states == NULL)
91 {
92 ERROR ("xencpu plugin: calloc() for cpu_states failed.");
93 xc_interface_close(xc_handle);
94 free(cpu_info);
95 return (ENOMEM);
96 }
98 return (0);
99 } /* static int xencpu_init */
101 static int xencpu_shutdown (void)
102 {
103 free(cpu_states);
104 free(cpu_info);
105 xc_interface_close(xc_handle);
107 return 0;
108 } /* static int xencpu_shutdown */
110 static void submit_value (int cpu_num, gauge_t percent)
111 {
112 value_t values[1];
113 value_list_t vl = VALUE_LIST_INIT;
115 values[0].gauge = percent;
117 vl.values = values;
118 vl.values_len = 1;
120 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
121 sstrncpy (vl.plugin, "xencpu", sizeof (vl.plugin));
122 sstrncpy (vl.type, "percent", sizeof (vl.type));
123 sstrncpy (vl.type_instance, "load", sizeof (vl.type_instance));
125 if (cpu_num >= 0) {
126 ssnprintf (vl.plugin_instance, sizeof (vl.plugin_instance),
127 "%i", cpu_num);
128 }
129 plugin_dispatch_values (&vl);
130 } /* static void submit_value */
132 static int xencpu_read (void)
133 {
134 cdtime_t now = cdtime ();
136 int rc, nr_cpus;
138 rc = xc_getcpuinfo(xc_handle, num_cpus, cpu_info, &nr_cpus);
139 if (rc < 0) {
140 ERROR ("xencpu: xc_getcpuinfo() Failed: %d %s\n", rc, xc_strerror(xc_handle,errno));
141 return (-1);
142 }
144 int cpu, status;
145 for (cpu = 0; cpu < nr_cpus; cpu++) {
146 gauge_t rate = NAN;
147 value_t value = {.derive = cpu_info[cpu].idletime};
149 status = value_to_rate (&rate, value, DS_TYPE_DERIVE, now, &cpu_states[cpu]);
150 if (status == 0) {
151 submit_value(cpu, 100 - rate/10000000);
152 }
153 }
155 return (0);
156 } /* static int xencpu_read */
158 void module_register (void)
159 {
160 plugin_register_init ("xencpu", xencpu_init);
161 plugin_register_read ("xencpu", xencpu_read);
162 plugin_register_shutdown ("xencpu", xencpu_shutdown);
163 } /* void module_register */