luci-app-statistics: add support for CPU frequency scaling stats

Add support for 'cpufreq' plugin in collectd, which monitors
the CPU cores' frequencies. Some platforms enable dynamic
frequency scaling according to CPU load.

'cpufreq' plugin can currently be built for x86 and mvebu.
(and it should likely be enabled also for ipq806x)

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>

5 files changed, 50 insertions, 1 deletions

diff --git a/applications/luci-app-statistics/luasrc/controller/luci_statistics/luci_statistics.lua b/applications/luci-app-statistics/luasrc/controller/luci_statistics/luci_statistics.lua
index 3f26aeed6..cf1bc2e6b 100644
--- a/applications/luci-app-statistics/luasrc/controller/luci_statistics/luci_statistics.lua
+++ b/applications/luci-app-statistics/luasrc/controller/luci_statistics/luci_statistics.lua
@@ -25,6 +25,7 @@ function index()
 
 		conntrack	= _("Conntrack"),
 		cpu			= _("Processor"),
+		cpufreq		= _("CPU Frequency"),
 		csv			= _("CSV Output"),
 		df			= _("Disk Space Usage"),
 		disk		= _("Disk Usage"),
@@ -56,7 +57,7 @@ function index()
 	-- our collectd menu
 	local collectd_menu = {
 		output  = { "csv", "network", "rrdtool", "unixsock" },
-		general = { "cpu", "df", "disk", "email", "entropy", "exec", "irq", "load", "memory", "nut", "processes", "sensors", "uptime" },
+		general = { "cpu", "cpufreq", "df", "disk", "email", "entropy", "exec", "irq", "load", "memory", "nut", "processes", "sensors", "uptime" },
 		network = { "conntrack", "dns", "interface", "iptables", "netlink", "olsrd", "openvpn", "ping", "splash_leases", "tcpconns", "iwinfo" }
 	}
 
diff --git a/applications/luci-app-statistics/luasrc/model/cbi/luci_statistics/cpufreq.lua b/applications/luci-app-statistics/luasrc/model/cbi/luci_statistics/cpufreq.lua
new file mode 100644
index 000000000..d1116630b
--- /dev/null
+++ b/applications/luci-app-statistics/luasrc/model/cbi/luci_statistics/cpufreq.lua
@@ -0,0 +1,14 @@
+-- Licensed to the public under the Apache License 2.0.
+
+m = Map("luci_statistics",
+	translate("CPU Frequency Plugin Configuration"),
+	translate("This plugin collects statistics about the processor frequency scaling."))
+
+-- collectd_cpufreq config section
+s = m:section( NamedSection, "collectd_cpufreq", "luci_statistics" )
+
+-- collectd_cpufreq.enable
+enable = s:option( Flag, "enable", translate("Enable this plugin") )
+enable.default = 0
+
+return m
diff --git a/applications/luci-app-statistics/luasrc/statistics/rrdtool/definitions/cpufreq.lua b/applications/luci-app-statistics/luasrc/statistics/rrdtool/definitions/cpufreq.lua
new file mode 100644
index 000000000..6e6363010
--- /dev/null
+++ b/applications/luci-app-statistics/luasrc/statistics/rrdtool/definitions/cpufreq.lua
@@ -0,0 +1,25 @@
+-- Licensed to the public under the Apache License 2.0.
+
+module("luci.statistics.rrdtool.definitions.cpufreq",package.seeall)
+
+function rrdargs( graph, plugin, plugin_instance, dtype )
+
+	return {
+		title = "%H: Processor frequency",
+		alt_autoscale = true,
+		vlabel = "Frequency (Hz)",
+		number_format = "%4.0lf%s",
+		data = {
+			instances = {
+				cpufreq = { "3", "2", "1", "0" }
+			},
+			options = {
+				cpufreq_0 = { color = "ff0000", title = "Core 0", noarea=true, overlay=true },
+				cpufreq_1 = { color = "0000ff", title = "Core 1", noarea=true, overlay=true },
+				cpufreq_2 = { color = "00ff00", title = "Core 2", noarea=true, overlay=true },
+				cpufreq_3 = { color = "00ffff", title = "Core 3", noarea=true, overlay=true }
+			}
+		}
+	}
+end
+
diff --git a/applications/luci-app-statistics/root/etc/config/luci_statistics b/applications/luci-app-statistics/root/etc/config/luci_statistics
index 4435d5c61..8fdcf434c 100644
--- a/applications/luci-app-statistics/root/etc/config/luci_statistics
+++ b/applications/luci-app-statistics/root/etc/config/luci_statistics
@@ -55,6 +55,9 @@ config statistics 'collectd_conntrack'
 config statistics 'collectd_cpu'
 	option enable '1'
 
+config statistics 'collectd_cpufreq'
+	option enable '0'
+
 config statistics 'collectd_df'
 	option enable '0'
 	option Devices '/dev/mtdblock/4'
diff --git a/applications/luci-app-statistics/root/usr/bin/stat-genconfig b/applications/luci-app-statistics/root/usr/bin/stat-genconfig
index 49d8a0993..ab8159bc2 100755
--- a/applications/luci-app-statistics/root/usr/bin/stat-genconfig
+++ b/applications/luci-app-statistics/root/usr/bin/stat-genconfig
@@ -273,6 +273,12 @@ plugins = {
 		{ }
 	},
 
+	cpufreq	= {
+		{ },
+		{ },
+		{ }
+	},
+
 	csv	= {
 		{ "DataDir" },
 		{ "StoreRates" },