1 files changed, 83 insertions, 0 deletions
diff --git a/charts.d/cpufreq.chart.sh b/charts.d/cpufreq.chart.sh
new file mode 100755
index 00000000..6a968237
--- /dev/null
+++ b/charts.d/cpufreq.chart.sh
@@ -0,0 +1,83 @@
+#!/bin/sh
+
+# if this chart is called X.chart.sh, then all functions and global variables
+# must start with X_
+
+cpufreq_sys_dir="/sys/devices"
+cpufreq_sys_depth=10
+cpufreq_source_update=1
+
+# _update_every is a special variable - it holds the number of seconds
+# between the calls of the _update() function
+cpufreq_update_every=
+cpufreq_priority=10000
+
+cpufreq_find_all_files() {
+	find $1 -maxdepth $cpufreq_sys_depth -name scaling_cur_freq 2>/dev/null
+}
+
+# _check is called once, to find out if this chart should be enabled or not
+cpufreq_check() {
+
+	# this should return:
+	#  - 0 to enable the chart
+	#  - 1 to disable the chart
+
+	[ -z "$( cpufreq_find_all_files $cpufreq_sys_dir )" ] && return 1
+	return 0
+}
+
+# _create is called once, to create the charts
+cpufreq_create() {
+	local dir= file= id= i=
+
+	# we create a script with the source of the
+	# cpufreq_update() function
+	# - the highest speed we can achieve -
+	[ $cpufreq_source_update -eq 1 ] && echo >$TMP_DIR/cpufreq.sh "cpufreq_update() {"
+
+	echo "CHART cpu.cpufreq '' 'CPU Clock' 'MHz' 'cpufreq' '' line $[cpufreq_priority + 1] $cpufreq_update_every"
+	echo >>$TMP_DIR/cpufreq.sh "echo \"BEGIN cpu.cpufreq \$1\""
+
+	i=0
+	for file in $( cpufreq_find_all_files $cpufreq_sys_dir | sort -u )
+	do
+		i=$(( i + 1 ))
+		dir=$( dirname $file )
+		cpu=
+
+		[ -f $dir/affected_cpus ] && cpu=$( cat $dir/affected_cpus )
+		[ -z "$cpu" ] && cpu="$i.a"
+
+		id="$( fixid "cpu$cpu" )"
+
+		echo >&2 "charts.d: cpufreq: on file='$file', dir='$dir', cpu='$cpu', id='$id'"
+
+		echo "DIMENSION $id '$id' absolute 1 1000"
+		echo >>$TMP_DIR/cpufreq.sh "printf \"SET $id = \"; cat $file "
+	done
+	echo >>$TMP_DIR/cpufreq.sh "echo END"
+
+	[ $cpufreq_source_update -eq 1 ] && echo >>$TMP_DIR/cpufreq.sh "}"
+	# cat >&2 $TMP_DIR/cpufreq.sh
+
+	# ok, load the function cpufreq_update() we created
+	[ $cpufreq_source_update -eq 1 ] && . $TMP_DIR/cpufreq.sh
+
+	return 0
+}
+
+# _update is called continiously, to collect the values
+cpufreq_update() {
+	# the first argument to this function is the microseconds since last update
+	# pass this parameter to the BEGIN statement (see bellow).
+
+	# do all the work to collect / calculate the values
+	# for each dimension
+	# remember: KEEP IT SIMPLE AND SHORT
+
+	[ $cpufreq_source_update -eq 0 ] && . $TMP_DIR/cpufreq.sh $1
+
+	return 0
+}
+