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 xc_handle = xc_interface_open(XC_INTERFACE_INIT_ARGS);
52 if (!xc_handle) {
53 ERROR("xencpu: xc_interface_open() failed");
54 return (-1);
55 }
57 xc_physinfo_t *physinfo;
59 physinfo = calloc(1, sizeof(xc_physinfo_t));
60 if (physinfo == NULL) {
61 ERROR("xencpu plugin: calloc() for physinfo failed.");
62 xc_interface_close(xc_handle);
63 return (ENOMEM);
64 }
66 if (xc_physinfo(xc_handle, physinfo) < 0) {
67 ERROR("xencpu plugin: xc_physinfo() failed");
68 xc_interface_close(xc_handle);
69 free(physinfo);
70 return (-1);
71 }
73 num_cpus = physinfo->nr_cpus;
74 free(physinfo);
76 INFO("xencpu plugin: Found %" PRIu32 " processors.", num_cpus);
78 cpu_info = calloc(num_cpus, sizeof(xc_cpuinfo_t));
79 if (cpu_info == NULL) {
80 ERROR("xencpu plugin: calloc() for num_cpus failed.");
81 xc_interface_close(xc_handle);
82 return (ENOMEM);
83 }
85 cpu_states = calloc(num_cpus, sizeof(value_to_rate_state_t));
86 if (cpu_states == NULL) {
87 ERROR("xencpu plugin: calloc() for cpu_states failed.");
88 xc_interface_close(xc_handle);
89 free(cpu_info);
90 return (ENOMEM);
91 }
93 return (0);
94 } /* static int xencpu_init */
96 static int xencpu_shutdown(void) {
97 free(cpu_states);
98 free(cpu_info);
99 xc_interface_close(xc_handle);
101 return 0;
102 } /* static int xencpu_shutdown */
104 static void submit_value(int cpu_num, gauge_t value) {
105 value_list_t vl = VALUE_LIST_INIT;
107 vl.values = &(value_t){.gauge = value};
108 vl.values_len = 1;
110 sstrncpy(vl.plugin, "xencpu", sizeof(vl.plugin));
111 sstrncpy(vl.type, "percent", sizeof(vl.type));
112 sstrncpy(vl.type_instance, "load", sizeof(vl.type_instance));
114 if (cpu_num >= 0) {
115 ssnprintf(vl.plugin_instance, sizeof(vl.plugin_instance), "%i", cpu_num);
116 }
117 plugin_dispatch_values(&vl);
118 } /* static void submit_value */
120 static int xencpu_read(void) {
121 cdtime_t now = cdtime();
123 int rc, nr_cpus;
125 rc = xc_getcpuinfo(xc_handle, num_cpus, cpu_info, &nr_cpus);
126 if (rc < 0) {
127 ERROR("xencpu: xc_getcpuinfo() Failed: %d %s\n", rc,
128 xc_strerror(xc_handle, errno));
129 return (-1);
130 }
132 int status;
133 for (int cpu = 0; cpu < nr_cpus; cpu++) {
134 gauge_t rate = NAN;
136 status = value_to_rate(&rate, (value_t){.derive = cpu_info[cpu].idletime},
137 DS_TYPE_DERIVE, now, &cpu_states[cpu]);
138 if (status == 0) {
139 submit_value(cpu, 100 - rate / 10000000);
140 }
141 }
143 return (0);
144 } /* static int xencpu_read */
146 void module_register(void) {
147 plugin_register_init("xencpu", xencpu_init);
148 plugin_register_read("xencpu", xencpu_read);
149 plugin_register_shutdown("xencpu", xencpu_shutdown);
150 } /* void module_register */