Added contextswitch plugin (for linux).

Signed-off-by: Florian Forster <octo@huhu.verplant.org>

diff --git a/configure.in b/configure.in
index 08de43b..f091d02 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -3567,6 +3567,7 @@ plugin_ascent="no"
 plugin_battery="no"
 plugin_bind="no"
 plugin_conntrack="no"
+plugin_contextswitch="no"
 plugin_cpu="no"
 plugin_cpufreq="no"
 plugin_curl_json="no"
@@ -3604,6 +3605,7 @@ if test "x$ac_system" = "xLinux"
 then
        plugin_battery="yes"
        plugin_conntrack="yes"
+       plugin_contextswitch="yes"
        plugin_cpu="yes"
        plugin_cpufreq="yes"
        plugin_disk="yes"
@@ -3839,6 +3841,7 @@ AC_PLUGIN([ascent],      [$plugin_ascent],     [AscentEmu player statistics])
 AC_PLUGIN([battery],     [$plugin_battery],    [Battery statistics])
 AC_PLUGIN([bind],        [$plugin_bind],       [ISC Bind nameserver statistics])
 AC_PLUGIN([conntrack],   [$plugin_conntrack],  [nf_conntrack statistics])
+AC_PLUGIN([contextswitch], [$plugin_contextswitch], [context switch statistics])
 AC_PLUGIN([cpufreq],     [$plugin_cpufreq],    [CPU frequency statistics])
 AC_PLUGIN([cpu],         [$plugin_cpu],        [CPU usage statistics])
 AC_PLUGIN([csv],         [yes],                [CSV output plugin])
@@ -4142,6 +4145,7 @@ Configuration:
     battery . . . . . . . $enable_battery
     bind  . . . . . . . . $enable_bind
     conntrack . . . . . . $enable_conntrack
+    contextswitch . . . . $enable_contextswitch
     cpu . . . . . . . . . $enable_cpu
     cpufreq . . . . . . . $enable_cpufreq
     csv . . . . . . . . . $enable_csv

diff --git a/src/Makefile.am b/src/Makefile.am
index 2e9f265..9bae902 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -173,6 +173,14 @@ collectd_LDADD += "-dlopen" conntrack.la
 collectd_DEPENDENCIES += conntrack.la
 endif
 
+if BUILD_PLUGIN_CONTEXTSWITCH
+pkglib_LTLIBRARIES += contextswitch.la
+contextswitch_la_SOURCES = contextswitch.c
+contextswitch_la_LDFLAGS = -module -avoid-version
+collectd_LDADD += "-dlopen" contextswitch.la
+collectd_DEPENDENCIES += contextswitch.la
+endif
+
 if BUILD_PLUGIN_CPU
 pkglib_LTLIBRARIES += cpu.la
 cpu_la_SOURCES = cpu.c

diff --git a/src/collectd.conf.in b/src/collectd.conf.in
index 8f28f8f..8d14f97 100644 (file)
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -57,6 +57,7 @@ FQDNLookup   true
 #@BUILD_PLUGIN_BATTERY_TRUE@LoadPlugin battery
 #@BUILD_PLUGIN_BIND_TRUE@LoadPlugin bind
 #@BUILD_PLUGIN_CONNTRACK_TRUE@LoadPlugin conntrack
+#@BUILD_PLUGIN_CONTEXTSWITCH_TRUE@LoadPlugin contextswitch
 @BUILD_PLUGIN_CPU_TRUE@@BUILD_PLUGIN_CPU_TRUE@LoadPlugin cpu
 #@BUILD_PLUGIN_CPUFREQ_TRUE@LoadPlugin cpufreq
 @LOAD_PLUGIN_CSV@LoadPlugin csv

diff --git a/src/contextswitch.c b/src/contextswitch.c
new file mode 100644 (file)
index 0000000..0db727c
--- /dev/null
+++ b/src/contextswitch.c
@@ -0,0 +1,95 @@
+/**
+ * collectd - src/contextswitch.c
+ * Copyright (C) 2009  Patrik Weiskircher
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; only version 2 of the License is applicable.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+ *
+ * Authors:
+ *   Patrik Weiskircher <weiskircher at inqnet.at>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+
+#if !KERNEL_LINUX
+# error "No applicable input method."
+#endif
+
+static void cs_submit (unsigned long context_switches)
+{
+       value_t values[1];
+       value_list_t vl = VALUE_LIST_INIT;
+
+       values[0].derive = context_switches;
+
+       vl.values = values;
+       vl.values_len = 1;
+       sstrncpy (vl.host, hostname_g, sizeof (vl.host));
+       sstrncpy (vl.plugin, "contextswitch", sizeof (vl.plugin));
+       sstrncpy (vl.type, "contextswitch", sizeof (vl.type));
+
+       plugin_dispatch_values (&vl);
+}
+
+static int cs_read (void)
+{
+       FILE *fh;
+       char buffer[64];
+       int numfields;
+       char *fields[2];
+       unsigned long result = 0;
+
+       fh = fopen ("/proc/stat", "r");
+       if (fh == NULL) {
+               ERROR ("contextswitch plugin: unable to open /proc/stat: %s",
+                               sstrerror (errno, buffer, sizeof (buffer)));
+               return (-1);
+       }
+
+       while (fgets(buffer, sizeof(buffer), fh))
+       {
+               if (strncmp(buffer, "ctxt", 4))
+                       continue;
+
+               numfields = strsplit(buffer, fields, 2);
+               if (numfields != 2) {
+                       ERROR ("contextswitch plugin: ctxt in /proc/stat contains more than 2 fields.");
+                       break;
+               }
+
+               result = strtoul(fields[1], NULL, 10);
+               if (errno == ERANGE && result == ULONG_MAX) {
+                       ERROR ("contextswitch plugin: ctxt value in /proc/stat overflows.");
+                       break;
+               }
+
+               break;
+       }
+       fclose(fh);
+
+       if (result == 0) {
+               ERROR ("contextswitch plugin: unable to find context switch value.");
+               return -1;
+       }
+
+       cs_submit(result);
+
+       return 0;
+}
+
+void module_register (void)
+{
+       plugin_register_read ("contextswitch", cs_read);
+} /* void module_register */

diff --git a/src/types.db b/src/types.db
index 399dbd2..0cbd403 100644 (file)
--- a/src/types.db
+++ b/src/types.db
@@ -19,6 +19,7 @@ charge                        value:GAUGE:0:U
 compression_ratio      value:GAUGE:0:2
 connections            value:COUNTER:0:U
 conntrack              entropy:GAUGE:0:4294967295
+contextswitch          contextswitches:DERIVE:0:U
 counter                        value:COUNTER:U:U
 cpufreq                        value:GAUGE:0:U
 cpu                    value:COUNTER:0:4294967295