From e9d95bf7eb929b9ddc9af9f4327b76c77ed4c7d6 Mon Sep 17 00:00:00 2001
From: "venkatesh.pallipadi@intel.com" <venkatesh.pallipadi@intel.com>
Date: Mon, 4 Aug 2008 11:59:10 -0700
Subject: [PATCH] [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: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dave Jones <davej@redhat.com>
---
drivers/cpufreq/cpufreq_ondemand.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index b935092aab21..3f898606e68c 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -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,
--
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