Trivial update: option for default ondemand cpufreq governor

This is a trivial patch that adds a Kconfig option to select the *ondemand* cpufreq governor as the *default cpufreq governor*.

It seemed as useful as the other default governor options, and since nobody else did it, here it is.

Feedback would be very appreciated. Also, please note that this is my first patch.

Applies cleanly to 2.6.10-rc2, 2.6.10-rc2-bk2 and 2.6.10-rc2-mm1. Applies to 2.6.9 sources with line offset errors only.

Signed-off-by; Pedro Venda <[email protected]>

diff -uprN linux-2.6.10-rc2-original/drivers/cpufreq/Kconfig linux-2.6.10-rc2/drivers/cpufreq/Kconfig
@@ -65,6 +65,15 @@ config CPU_FREQ_DEFAULT_GOV_USERSPACE
 	  program shall be able to set the CPU dynamically without having
 	  to enable the userspace governor manually.
 
+config CPU_FREQ_DEFAULT_GOV_ONDEMAND
+	bool "ondemand"
+	select CPU_FREQ_GOV_ONDEMAND
+	help
+	  Use the CPUFreq governor 'ondemand' as default. This uses a
+	  polling mechanism to dynamically change frequency based on
+	  the CPU utilization. The desired functioning of this governor
+	  depends on the CPU capability to do fast frequency switching.
+	
 endchoice
 
 config CPU_FREQ_GOV_PERFORMANCE

diff -uprN linux-2.6.10-rc2-original/include/linux/cpufreq.h linux-2.6.10-rc2/include/linux/cpufreq.h
@@ -323,6 +323,9 @@ extern struct cpufreq_governor cpufreq_g
 #elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE)
 extern struct cpufreq_governor cpufreq_gov_userspace;
 #define CPUFREQ_DEFAULT_GOVERNOR	&cpufreq_gov_userspace
+#elif defined(CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND)
+extern struct cpufreq_governor cpufreq_gov_dbs;
+#define CPUFREQ_DEFAULT_GOVERNOR	&cpufreq_gov_dbs
 #endif
 
 

Pedro João Lopes Venda
email: [email protected]
http://arrakis.dhis.org

Hi,

See here:

	http://www.ussg.iu.edu/hypermail/linux/kernel/0408.3/0953.html

"... If transition_latency is high, the ondemand governor initialization will fail (User level governor is suggested in this case). Hence it cannot be used as a default governor."

Dmitry

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| See here:
|
| 	http://www.ussg.iu.edu/hypermail/linux/kernel/0408.3/0953.html
|
| "... If transition_latency is high, the ondemand governor initialization
| will fail (User level governor is suggested in this case). Hence it cannot
| be used as a default governor."

ok, thanks. shame on me.

- --

Pedro João Lopes Venda
email: [email protected]
http://arrakis.dhis.org
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