2 * collectd - src/contextswitch.c
3 * Copyright (C) 2009 Patrik Weiskircher
4 * Copyright (C) 2010 Kimo Rosenbaum
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; only version 2 of the License is applicable.
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 * Patrik Weiskircher <weiskircher at inqnet.at>
21 * Kimo Rosenbaum <http://github.com/kimor79>
29 #ifdef HAVE_SYS_SYSCTL_H
30 #include <sys/sysctl.h>
34 /* no global variables */
35 /* #endif HAVE_SYSCTLBYNAME */
38 /* no global variables */
39 /* #endif KERNEL_LINUX */
42 #include <libperfstat.h>
43 #include <sys/protosw.h>
44 /* #endif HAVE_PERFSTAT */
47 #error "No applicable input method."
50 static void cs_submit(derive_t context_switches) {
51 value_list_t vl = VALUE_LIST_INIT;
53 vl.values = &(value_t){.derive = context_switches};
55 sstrncpy(vl.plugin, "contextswitch", sizeof(vl.plugin));
56 sstrncpy(vl.type, "contextswitch", sizeof(vl.type));
58 plugin_dispatch_values(&vl);
61 static int cs_read(void) {
64 size_t value_len = sizeof(value);
67 status = sysctlbyname("vm.stats.sys.v_swtch", &value, &value_len,
68 /* new pointer = */ NULL, /* new length = */ 0);
70 ERROR("contextswitch plugin: sysctlbyname "
71 "(vm.stats.sys.v_swtch) failed");
76 /* #endif HAVE_SYSCTLBYNAME */
86 fh = fopen("/proc/stat", "r");
88 ERROR("contextswitch plugin: unable to open /proc/stat: %s", STRERRNO);
92 while (fgets(buffer, sizeof(buffer), fh) != NULL) {
95 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
99 if (strcmp("ctxt", fields[0]) != 0)
104 result = (derive_t)strtoll(fields[1], &endptr, /* base = */ 10);
105 if ((endptr == fields[1]) || (errno != 0)) {
106 ERROR("contextswitch plugin: Cannot parse ctxt value: %s", fields[1]);
118 ERROR("contextswitch plugin: Unable to find context switch value.");
119 /* #endif KERNEL_LINUX */
123 perfstat_cpu_total_t perfcputotal;
126 perfstat_cpu_total(NULL, &perfcputotal, sizeof(perfstat_cpu_total_t), 1);
128 ERROR("contextswitch plugin: perfstat_cpu_total: %s", STRERRNO);
132 cs_submit(perfcputotal.pswitch);
134 #endif /* defined(HAVE_PERFSTAT) */
139 void module_register(void) {
140 plugin_register_read("contextswitch", cs_read);
141 } /* void module_register */