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 <sys/protosw.h>
43 # include <libperfstat.h>
44 /* #endif HAVE_PERFSTAT */
47 # error "No applicable input method."
50 static void cs_submit (derive_t context_switches)
52 value_list_t vl = VALUE_LIST_INIT;
54 vl.values = &(value_t) { .derive = context_switches };
56 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
57 sstrncpy (vl.plugin, "contextswitch", sizeof (vl.plugin));
58 sstrncpy (vl.type, "contextswitch", sizeof (vl.type));
60 plugin_dispatch_values (&vl);
63 static int cs_read (void)
67 size_t value_len = sizeof (value);
70 status = sysctlbyname ("vm.stats.sys.v_swtch",
72 /* new pointer = */ NULL, /* new length = */ 0);
75 ERROR("contextswitch plugin: sysctlbyname "
76 "(vm.stats.sys.v_swtch) failed");
81 /* #endif HAVE_SYSCTLBYNAME */
91 fh = fopen ("/proc/stat", "r");
93 ERROR ("contextswitch plugin: unable to open /proc/stat: %s",
94 sstrerror (errno, buffer, sizeof (buffer)));
98 while (fgets(buffer, sizeof(buffer), fh) != NULL)
102 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE (fields));
106 if (strcmp("ctxt", fields[0]) != 0)
111 result = (derive_t) strtoll (fields[1], &endptr, /* base = */ 10);
112 if ((endptr == fields[1]) || (errno != 0)) {
113 ERROR ("contextswitch plugin: Cannot parse ctxt value: %s",
126 ERROR ("contextswitch plugin: Unable to find context switch value.");
127 /* #endif KERNEL_LINUX */
131 perfstat_cpu_total_t perfcputotal;
133 status = perfstat_cpu_total(NULL, &perfcputotal, sizeof(perfstat_cpu_total_t), 1);
137 ERROR ("contextswitch plugin: perfstat_cpu_total: %s",
138 sstrerror (errno, errbuf, sizeof (errbuf)));
142 cs_submit(perfcputotal.pswitch);
144 #endif /* defined(HAVE_PERFSTAT) */
149 void module_register (void)
151 plugin_register_read ("contextswitch", cs_read);
152 } /* void module_register */