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Commit e9d95bf7 authored by venkatesh.pallipadi@intel.com's avatar venkatesh.pallipadi@intel.com Committed by Dave Jones
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[CPUFREQ][4/6] cpufreq_ondemand: Parameterize down differential 



Use a parameter for down differential, instead of hardcoded 10%. Follow-on
patch changes the down-differential dynamically, based on whether
we are using idle micro-accounting or not.

Signed-off-by: default avatarVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: default avatarDave Jones <davej@redhat.com>
parent 3430502d

drivers/cpufreq/cpufreq_ondemand.c

+9 −2
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
 * It helps to keep variable names smaller, simpler

 */



#define DEF_FREQUENCY_DOWN_DIFFERENTIAL		(10)

#define DEF_FREQUENCY_UP_THRESHOLD		(80)

#define MIN_FREQUENCY_UP_THRESHOLD		(11)

#define MAX_FREQUENCY_UP_THRESHOLD		(100)
@@ -86,10 +87,12 @@ static struct workqueue_struct *kondemand_wq; 
static struct dbs_tuners {

	unsigned int sampling_rate;

	unsigned int up_threshold;

	unsigned int down_differential;

	unsigned int ignore_nice;

	unsigned int powersave_bias;

} dbs_tuners_ins = {

	.up_threshold = DEF_FREQUENCY_UP_THRESHOLD,

	.down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL,

	.ignore_nice = 0,

	.powersave_bias = 0,

};
@@ -424,9 +427,13 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) 
	 * can support the current CPU usage without triggering the up

	 * policy. To be safe, we focus 10 points under the threshold.

	 */

	if (max_load_freq < (dbs_tuners_ins.up_threshold - 10) * policy->cur) {

	if (max_load_freq <

	    (dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential) *

	     policy->cur) {

		unsigned int freq_next;

		freq_next = max_load_freq / (dbs_tuners_ins.up_threshold - 10);

		freq_next = max_load_freq /

				(dbs_tuners_ins.up_threshold -

				 dbs_tuners_ins.down_differential);



		if (!dbs_tuners_ins.powersave_bias) {

			__cpufreq_driver_target(policy, freq_next,