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Date: Thu, 12 Feb 2009 12:08:04 -0800
From: Mike Chan <mike@...roid.com>
To: davej@...emonkey.org.uk
Cc: linux-kernel@...r.kernel.org, cpufreq@...r.kernel.org
Subject: [PATCH] cpufreq: Governor poll frequency tuneables exported in config.
cpufreq: Governor poll frequency tuneables exported in config.
Signed-off-by: Mike Chan <mike@...roid.com>
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 5f076ae..e9361a9 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -190,4 +190,17 @@ config CPU_FREQ_GOV_CONSERVATIVE
If in doubt, say N.
+config CPU_FREQ_MIN_TICKS
+ int "Ticks between governor polling interval."
+ default 10
+ help
+ Minimum number of ticks between polling interval for governors.
+
+config CPU_FREQ_SAMPLING_LATENCY_MULTIPLIER
+ int "Sampling rate multiplier for governors."
+ default 1000
+ help
+ Sampling latency rate multiplied by the cpu switch latency.
+ Affects governor polling.
+
endif # CPU_FREQ
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index ac0bbf2..7bc227e 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -51,11 +51,10 @@ static unsigned int def_sampling_rate;
#define MIN_SAMPLING_RATE_RATIO (2)
/* for correct statistics, we need at least 10 ticks between each measure */
#define MIN_STAT_SAMPLING_RATE \
- (MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10))
+ (MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(CONFIG_CPU_FREQ_MIN_TICKS))
#define MIN_SAMPLING_RATE \
(def_sampling_rate / MIN_SAMPLING_RATE_RATIO)
#define MAX_SAMPLING_RATE (500 * def_sampling_rate)
-#define DEF_SAMPLING_RATE_LATENCY_MULTIPLIER (1000)
#define DEF_SAMPLING_DOWN_FACTOR (1)
#define MAX_SAMPLING_DOWN_FACTOR (10)
#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
@@ -523,7 +522,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
latency = 1;
def_sampling_rate = 10 * latency *
- DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
+ CONFIG_CPU_FREQ_SAMPLING_LATENCY_MULTIPLIER;
if (def_sampling_rate < MIN_STAT_SAMPLING_RATE)
def_sampling_rate = MIN_STAT_SAMPLING_RATE;
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 33855cb..c7df643 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -42,11 +42,10 @@ static unsigned int def_sampling_rate;
#define MIN_SAMPLING_RATE_RATIO (2)
/* for correct statistics, we need at least 10 ticks between each measure */
#define MIN_STAT_SAMPLING_RATE \
- (MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10))
+ (MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(CONFIG_CPU_FREQ_MIN_TICKS))
#define MIN_SAMPLING_RATE \
(def_sampling_rate / MIN_SAMPLING_RATE_RATIO)
#define MAX_SAMPLING_RATE (500 * def_sampling_rate)
-#define DEF_SAMPLING_RATE_LATENCY_MULTIPLIER (1000)
#define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000)
static void do_dbs_timer(struct work_struct *work);
@@ -542,7 +541,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
latency = 1;
def_sampling_rate = latency *
- DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
+ CONFIG_CPU_FREQ_SAMPLING_LATENCY_MULTIPLIER;
if (def_sampling_rate < MIN_STAT_SAMPLING_RATE)
def_sampling_rate = MIN_STAT_SAMPLING_RATE;
--
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