From 2c906b317b2d9c7e32b0d513e102bd68a2c49112 Mon Sep 17 00:00:00 2001
From: Alexander Clouter <alex@digriz.org.uk>
Date: Wed, 22 Mar 2006 09:54:10 +0000
Subject: [PATCH 01/10] [PATCH] cpufreq_conservative: aligning of codebase with
ondemand
Since the conservative govenor was released its codebase has drifted from the
the direction and updates that have been applied to the ondemand govornor.
This patch addresses the lack of updates in that period and brings
conservative back up to date. The resulting diff file between
cpufreq_ondemand.c and cpufreq_conservative.c is now much smaller and shows
more clearly the differences between the two.
Another reason to do this is ages ago, knowingly, I did a piss poor attempt
at making conservative less responsive by knocking up
DEF_SAMPLING_RATE_LATENCY_MULTIPLIER by two orders of magnitude. I did fix
this ages ago but in my dis-organisation I must have toasted the diff and
left it the way it was. About two weeks ago a user contacted me saying he
was having problems with the conservative governor with his AMD Athlon XP-M
2800+ as /sys/devices/system/cpu/cpu0/cpufreq/conservative showed
sampling_rate_min 9950000
sampling_rate_max 1360065408
Nine seconds to decide about changing the frequency....not too responsive :)
Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
drivers/cpufreq/cpufreq_conservative.c | 53 +++++++++++++-------------
1 file changed, 27 insertions(+), 26 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index ac38766b2583e..adecd31f6156f 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -35,12 +35,7 @@
*/
#define DEF_FREQUENCY_UP_THRESHOLD (80)
-#define MIN_FREQUENCY_UP_THRESHOLD (0)
-#define MAX_FREQUENCY_UP_THRESHOLD (100)
-
#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
-#define MIN_FREQUENCY_DOWN_THRESHOLD (0)
-#define MAX_FREQUENCY_DOWN_THRESHOLD (100)
/*
* The polling frequency of this governor depends on the capability of
@@ -53,10 +48,14 @@
* All times here are in uS.
*/
static unsigned int def_sampling_rate;
-#define MIN_SAMPLING_RATE (def_sampling_rate / 2)
+#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))
+#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 (100000)
-#define DEF_SAMPLING_DOWN_FACTOR (5)
+#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)
static void do_dbs_timer(void *data);
@@ -136,7 +135,7 @@ static ssize_t store_sampling_down_factor(struct cpufreq_policy *unused,
unsigned int input;
int ret;
ret = sscanf (buf, "%u", &input);
- if (ret != 1 )
+ if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
return -EINVAL;
mutex_lock(&dbs_mutex);
@@ -173,8 +172,7 @@ static ssize_t store_up_threshold(struct cpufreq_policy *unused,
ret = sscanf (buf, "%u", &input);
mutex_lock(&dbs_mutex);
- if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD ||
- input < MIN_FREQUENCY_UP_THRESHOLD ||
+ if (ret != 1 || input > 100 || input < 0 ||
input <= dbs_tuners_ins.down_threshold) {
mutex_unlock(&dbs_mutex);
return -EINVAL;
@@ -194,8 +192,7 @@ static ssize_t store_down_threshold(struct cpufreq_policy *unused,
ret = sscanf (buf, "%u", &input);
mutex_lock(&dbs_mutex);
- if (ret != 1 || input > MAX_FREQUENCY_DOWN_THRESHOLD ||
- input < MIN_FREQUENCY_DOWN_THRESHOLD ||
+ if (ret != 1 || input > 100 || input < 0 ||
input >= dbs_tuners_ins.up_threshold) {
mutex_unlock(&dbs_mutex);
return -EINVAL;
@@ -337,7 +334,6 @@ static void dbs_check_cpu(int cpu)
*/
/* Check for frequency increase */
-
idle_ticks = UINT_MAX;
for_each_cpu_mask(j, policy->cpus) {
unsigned int tmp_idle_ticks, total_idle_ticks;
@@ -357,7 +353,7 @@ static void dbs_check_cpu(int cpu)
/* Scale idle ticks by 100 and compare with up and down ticks */
idle_ticks *= 100;
up_idle_ticks = (100 - dbs_tuners_ins.up_threshold) *
- usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
+ usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
if (idle_ticks < up_idle_ticks) {
down_skip[cpu] = 0;
@@ -398,6 +394,7 @@ static void dbs_check_cpu(int cpu)
struct cpu_dbs_info_s *j_dbs_info;
j_dbs_info = &per_cpu(cpu_dbs_info, j);
+ /* Check for frequency decrease */
total_idle_ticks = j_dbs_info->prev_cpu_idle_up;
tmp_idle_ticks = total_idle_ticks -
j_dbs_info->prev_cpu_idle_down;
@@ -414,12 +411,14 @@ static void dbs_check_cpu(int cpu)
freq_down_sampling_rate = dbs_tuners_ins.sampling_rate *
dbs_tuners_ins.sampling_down_factor;
down_idle_ticks = (100 - dbs_tuners_ins.down_threshold) *
- usecs_to_jiffies(freq_down_sampling_rate);
+ usecs_to_jiffies(freq_down_sampling_rate);
if (idle_ticks > down_idle_ticks) {
- /* if we are already at the lowest speed then break out early
+ /*
+ * if we are already at the lowest speed then break out early
* or if we 'cannot' reduce the speed as the user might want
- * freq_step to be zero */
+ * freq_step to be zero
+ */
if (requested_freq[cpu] == policy->min
|| dbs_tuners_ins.freq_step == 0)
return;
@@ -434,9 +433,8 @@ static void dbs_check_cpu(int cpu)
if (requested_freq[cpu] < policy->min)
requested_freq[cpu] = policy->min;
- __cpufreq_driver_target(policy,
- requested_freq[cpu],
- CPUFREQ_RELATION_H);
+ __cpufreq_driver_target(policy, requested_freq[cpu],
+ CPUFREQ_RELATION_H);
return;
}
}
@@ -507,13 +505,16 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
if (dbs_enable == 1) {
unsigned int latency;
/* policy latency is in nS. Convert it to uS first */
+ latency = policy->cpuinfo.transition_latency / 1000;
+ if (latency == 0)
+ latency = 1;
- latency = policy->cpuinfo.transition_latency;
- if (latency < 1000)
- latency = 1000;
-
- def_sampling_rate = (latency / 1000) *
+ def_sampling_rate = latency *
DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
+
+ if (def_sampling_rate < MIN_STAT_SAMPLING_RATE)
+ def_sampling_rate = MIN_STAT_SAMPLING_RATE;
+
dbs_tuners_ins.sampling_rate = def_sampling_rate;
dbs_tuners_ins.ignore_nice = 0;
dbs_tuners_ins.freq_step = 5;
From e8a02572252f9115c2b8296c40fd8b985f06f872 Mon Sep 17 00:00:00 2001
From: Alexander Clouter <alex@digriz.org.uk>
Date: Wed, 22 Mar 2006 09:56:23 +0000
Subject: [PATCH 02/10] [PATCH] cpufreq_conservative: alter default
responsiveness
The sensible approach to making conservative less responsive than ondemand :)
As mentioned in patch [1/4]. We do not want conservative to shoot through
all the frequencies, its point (by default) is to slowly move through them.
By default its ten times less responsive.
Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
drivers/cpufreq/cpufreq_conservative.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index adecd31f6156f..3ca3cf0616426 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -509,7 +509,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
if (latency == 0)
latency = 1;
- def_sampling_rate = latency *
+ def_sampling_rate = 10 * latency *
DEF_SAMPLING_RATE_LATENCY_MULTIPLIER;
if (def_sampling_rate < MIN_STAT_SAMPLING_RATE)
From 08a28e2e98aa821cf6f15f8a267beb2f33377bb9 Mon Sep 17 00:00:00 2001
From: Alexander Clouter <alex@digriz.org.uk>
Date: Wed, 22 Mar 2006 09:59:16 +0000
Subject: [PATCH 03/10] [PATCH] cpufreq_conservative: make for_each_cpu() safe
All these changes should make cpufreq_conservative safe in regards to the x86
for_each_cpu cpumask.h changes and whatnot.
Whilst making it safe a number of pointless for loops related to the cpu
mask's were removed. I was never comfortable with all those for loops,
especially as the iteration is over the same data again and again for each
CPU you had in a single poll, an O(n^2) outcome to frequency scaling.
The approach I use is to assume by default no CPU's exist and it sets the
requested_freq to zero as a kind of flag, the reasoning is in the source ;)
If the CPU is queried and requested_freq is zero then it initialises the
variable to current_freq and then continues as if nothing happened which
should be the same net effect as before?
Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
drivers/cpufreq/cpufreq_conservative.c | 91 ++++++++++++--------------
1 file changed, 42 insertions(+), 49 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 3ca3cf0616426..7498f2506adea 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -294,31 +294,40 @@ static struct attribute_group dbs_attr_group = {
static void dbs_check_cpu(int cpu)
{
unsigned int idle_ticks, up_idle_ticks, down_idle_ticks;
+ unsigned int tmp_idle_ticks, total_idle_ticks;
unsigned int freq_step;
unsigned int freq_down_sampling_rate;
- static int down_skip[NR_CPUS];
- static int requested_freq[NR_CPUS];
- static unsigned short init_flag = 0;
- struct cpu_dbs_info_s *this_dbs_info;
- struct cpu_dbs_info_s *dbs_info;
-
+ static unsigned short down_skip[NR_CPUS];
+ static unsigned int requested_freq[NR_CPUS];
+ static unsigned int init_flag = NR_CPUS;
+ struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
struct cpufreq_policy *policy;
- unsigned int j;
- this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
if (!this_dbs_info->enable)
return;
- policy = this_dbs_info->cur_policy;
-
- if ( init_flag == 0 ) {
- for_each_online_cpu(j) {
- dbs_info = &per_cpu(cpu_dbs_info, j);
- requested_freq[j] = dbs_info->cur_policy->cur;
+ if ( init_flag != 0 ) {
+ for_each_cpu(init_flag) {
+ down_skip[init_flag] = 0;
+ /* I doubt a CPU exists with a freq of 0hz :) */
+ requested_freq[init_flag] = 0;
}
- init_flag = 1;
+ init_flag = 0;
}
+ /*
+ * If its a freshly initialised cpu we setup requested_freq. This
+ * check could be avoided if we did not care about a first time
+ * stunted increase in CPU speed when there is a load. I feel we
+ * should be initialising this to something. The removal of a CPU
+ * is not a problem, after a short time the CPU should settle down
+ * to a 'natural' frequency.
+ */
+ if (requested_freq[cpu] == 0)
+ requested_freq[cpu] = this_dbs_info->cur_policy->cur;
+
+ policy = this_dbs_info->cur_policy;
+
/*
* The default safe range is 20% to 80%
* Every sampling_rate, we check
@@ -335,20 +344,15 @@ static void dbs_check_cpu(int cpu)
/* Check for frequency increase */
idle_ticks = UINT_MAX;
- for_each_cpu_mask(j, policy->cpus) {
- unsigned int tmp_idle_ticks, total_idle_ticks;
- struct cpu_dbs_info_s *j_dbs_info;
- j_dbs_info = &per_cpu(cpu_dbs_info, j);
- /* Check for frequency increase */
- total_idle_ticks = get_cpu_idle_time(j);
- tmp_idle_ticks = total_idle_ticks -
- j_dbs_info->prev_cpu_idle_up;
- j_dbs_info->prev_cpu_idle_up = total_idle_ticks;
-
- if (tmp_idle_ticks < idle_ticks)
- idle_ticks = tmp_idle_ticks;
- }
+ /* Check for frequency increase */
+ total_idle_ticks = get_cpu_idle_time(cpu);
+ tmp_idle_ticks = total_idle_ticks -
+ this_dbs_info->prev_cpu_idle_up;
+ this_dbs_info->prev_cpu_idle_up = total_idle_ticks;
+
+ if (tmp_idle_ticks < idle_ticks)
+ idle_ticks = tmp_idle_ticks;
/* Scale idle ticks by 100 and compare with up and down ticks */
idle_ticks *= 100;
@@ -357,13 +361,9 @@ static void dbs_check_cpu(int cpu)
if (idle_ticks < up_idle_ticks) {
down_skip[cpu] = 0;
- for_each_cpu_mask(j, policy->cpus) {
- struct cpu_dbs_info_s *j_dbs_info;
+ this_dbs_info->prev_cpu_idle_down =
+ this_dbs_info->prev_cpu_idle_up;
- j_dbs_info = &per_cpu(cpu_dbs_info, j);
- j_dbs_info->prev_cpu_idle_down =
- j_dbs_info->prev_cpu_idle_up;
- }
/* if we are already at full speed then break out early */
if (requested_freq[cpu] == policy->max)
return;
@@ -388,21 +388,14 @@ static void dbs_check_cpu(int cpu)
if (down_skip[cpu] < dbs_tuners_ins.sampling_down_factor)
return;
- idle_ticks = UINT_MAX;
- for_each_cpu_mask(j, policy->cpus) {
- unsigned int tmp_idle_ticks, total_idle_ticks;
- struct cpu_dbs_info_s *j_dbs_info;
+ /* Check for frequency decrease */
+ total_idle_ticks = this_dbs_info->prev_cpu_idle_up;
+ tmp_idle_ticks = total_idle_ticks -
+ this_dbs_info->prev_cpu_idle_down;
+ this_dbs_info->prev_cpu_idle_down = total_idle_ticks;
- j_dbs_info = &per_cpu(cpu_dbs_info, j);
- /* Check for frequency decrease */
- total_idle_ticks = j_dbs_info->prev_cpu_idle_up;
- tmp_idle_ticks = total_idle_ticks -
- j_dbs_info->prev_cpu_idle_down;
- j_dbs_info->prev_cpu_idle_down = total_idle_ticks;
-
- if (tmp_idle_ticks < idle_ticks)
- idle_ticks = tmp_idle_ticks;
- }
+ if (tmp_idle_ticks < idle_ticks)
+ idle_ticks = tmp_idle_ticks;
/* Scale idle ticks by 100 and compare with up and down ticks */
idle_ticks *= 100;
@@ -491,7 +484,7 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
j_dbs_info = &per_cpu(cpu_dbs_info, j);
j_dbs_info->cur_policy = policy;
- j_dbs_info->prev_cpu_idle_up = get_cpu_idle_time(j);
+ j_dbs_info->prev_cpu_idle_up = get_cpu_idle_time(cpu);
j_dbs_info->prev_cpu_idle_down
= j_dbs_info->prev_cpu_idle_up;
}
From a159b82770ab84e1b5e0306fa65e158188492b16 Mon Sep 17 00:00:00 2001
From: Alexander Clouter <alex@digriz.org.uk>
Date: Wed, 22 Mar 2006 10:00:18 +0000
Subject: [PATCH 04/10] [PATCH] cpufreq_conservative: alternative initialise
approach
Venki, author of cpufreq_ondemand, came up with a neater way to remove the
initialiser code from the main loop of my code and out to the point when the
governor is actually initialised.
Not only does it look but it also feels cleaner, plus its simpler to
understand. It also saves a bunch of pointless conditional statements in the
main loop.
Signed-off-by: Alexander Clouter <alex-kernel@digriz.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
drivers/cpufreq/cpufreq_conservative.c | 55 +++++++++-----------------
1 file changed, 18 insertions(+), 37 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 7498f2506adea..a152d2c46be75 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -65,6 +65,8 @@ struct cpu_dbs_info_s {
unsigned int prev_cpu_idle_up;
unsigned int prev_cpu_idle_down;
unsigned int enable;
+ unsigned int down_skip;
+ unsigned int requested_freq;
};
static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
@@ -297,35 +299,12 @@ static void dbs_check_cpu(int cpu)
unsigned int tmp_idle_ticks, total_idle_ticks;
unsigned int freq_step;
unsigned int freq_down_sampling_rate;
- static unsigned short down_skip[NR_CPUS];
- static unsigned int requested_freq[NR_CPUS];
- static unsigned int init_flag = NR_CPUS;
struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
struct cpufreq_policy *policy;
if (!this_dbs_info->enable)
return;
- if ( init_flag != 0 ) {
- for_each_cpu(init_flag) {
- down_skip[init_flag] = 0;
- /* I doubt a CPU exists with a freq of 0hz :) */
- requested_freq[init_flag] = 0;
- }
- init_flag = 0;
- }
-
- /*
- * If its a freshly initialised cpu we setup requested_freq. This
- * check could be avoided if we did not care about a first time
- * stunted increase in CPU speed when there is a load. I feel we
- * should be initialising this to something. The removal of a CPU
- * is not a problem, after a short time the CPU should settle down
- * to a 'natural' frequency.
- */
- if (requested_freq[cpu] == 0)
- requested_freq[cpu] = this_dbs_info->cur_policy->cur;
-
policy = this_dbs_info->cur_policy;
/*
@@ -360,12 +339,12 @@ static void dbs_check_cpu(int cpu)
usecs_to_jiffies(dbs_tuners_ins.sampling_rate);
if (idle_ticks < up_idle_ticks) {
- down_skip[cpu] = 0;
+ this_dbs_info->down_skip = 0;
this_dbs_info->prev_cpu_idle_down =
this_dbs_info->prev_cpu_idle_up;
/* if we are already at full speed then break out early */
- if (requested_freq[cpu] == policy->max)
+ if (this_dbs_info->requested_freq == policy->max)
return;
freq_step = (dbs_tuners_ins.freq_step * policy->max) / 100;
@@ -374,18 +353,18 @@ static void dbs_check_cpu(int cpu)
if (unlikely(freq_step == 0))
freq_step = 5;
- requested_freq[cpu] += freq_step;
- if (requested_freq[cpu] > policy->max)
- requested_freq[cpu] = policy->max;
+ this_dbs_info->requested_freq += freq_step;
+ if (this_dbs_info->requested_freq > policy->max)
+ this_dbs_info->requested_freq = policy->max;
- __cpufreq_driver_target(policy, requested_freq[cpu],
+ __cpufreq_driver_target(policy, this_dbs_info->requested_freq,
CPUFREQ_RELATION_H);
return;
}
/* Check for frequency decrease */
- down_skip[cpu]++;
- if (down_skip[cpu] < dbs_tuners_ins.sampling_down_factor)
+ this_dbs_info->down_skip++;
+ if (this_dbs_info->down_skip < dbs_tuners_ins.sampling_down_factor)
return;
/* Check for frequency decrease */
@@ -399,7 +378,7 @@ static void dbs_check_cpu(int cpu)
/* Scale idle ticks by 100 and compare with up and down ticks */
idle_ticks *= 100;
- down_skip[cpu] = 0;
+ this_dbs_info->down_skip = 0;
freq_down_sampling_rate = dbs_tuners_ins.sampling_rate *
dbs_tuners_ins.sampling_down_factor;
@@ -412,7 +391,7 @@ static void dbs_check_cpu(int cpu)
* or if we 'cannot' reduce the speed as the user might want
* freq_step to be zero
*/
- if (requested_freq[cpu] == policy->min
+ if (this_dbs_info->requested_freq == policy->min
|| dbs_tuners_ins.freq_step == 0)
return;
@@ -422,11 +401,11 @@ static void dbs_check_cpu(int cpu)
if (unlikely(freq_step == 0))
freq_step = 5;
- requested_freq[cpu] -= freq_step;
- if (requested_freq[cpu] < policy->min)
- requested_freq[cpu] = policy->min;
+ this_dbs_info->requested_freq -= freq_step;
+ if (this_dbs_info->requested_freq < policy->min)
+ this_dbs_info->requested_freq = policy->min;
- __cpufreq_driver_target(policy, requested_freq[cpu],
+ __cpufreq_driver_target(policy, this_dbs_info->requested_freq,
CPUFREQ_RELATION_H);
return;
}
@@ -489,6 +468,8 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
= j_dbs_info->prev_cpu_idle_up;
}
this_dbs_info->enable = 1;
+ this_dbs_info->down_skip = 0;
+ this_dbs_info->requested_freq = policy->cur;
sysfs_create_group(&policy->kobj, &dbs_attr_group);
dbs_enable++;
/*
From ff8c288d7d1a368b663058cdee1ea0adcdef2fa2 Mon Sep 17 00:00:00 2001
From: Eric Piel <Eric.Piel@tremplin-utc.net>
Date: Fri, 10 Mar 2006 11:34:16 +0200
Subject: [PATCH 05/10] [PATCH] cpufreq_ondemand: Warn if it cannot run due to
too long transition latency
Display a warning if the ondemand governor can not be selected due to a
transition latency of the cpufreq driver which is too long.
Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
drivers/cpufreq/cpufreq_ondemand.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 69aa1db8336cd..6430489db6f41 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -395,8 +395,11 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
return -EINVAL;
if (policy->cpuinfo.transition_latency >
- (TRANSITION_LATENCY_LIMIT * 1000))
+ (TRANSITION_LATENCY_LIMIT * 1000)) {
+ printk(KERN_WARNING "ondemand governor failed to load "
+ "due to too long transition latency\n");
return -EINVAL;
+ }
if (this_dbs_info->enable) /* Already enabled */
break;
From 9cbad61b41f0b6f0a4c600fe96d8292ffd592b50 Mon Sep 17 00:00:00 2001
From: Eric Piel <Eric.Piel@tremplin-utc.net>
Date: Fri, 10 Mar 2006 11:35:27 +0200
Subject: [PATCH 06/10] [PATCH] cpufreq_ondemand: keep ignore_nice_load value
when it is reselected
Keep the value of ignore_nice_load of the ondemand governor even after
the governor has been deselected and selected back. This is the behavior
of the other exported values of the ondemand governor and it's much more
user-friendly.
Signed-off-by: Eric Piel <eric.piel@tremplin-utc.net>
Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
drivers/cpufreq/cpufreq_ondemand.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 6430489db6f41..cd846f57147e5 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -84,6 +84,7 @@ struct dbs_tuners {
static struct dbs_tuners dbs_tuners_ins = {
.up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
.sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
+ .ignore_nice = 0,
};
static inline unsigned int get_cpu_idle_time(unsigned int cpu)
@@ -434,8 +435,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
def_sampling_rate = MIN_STAT_SAMPLING_RATE;
dbs_tuners_ins.sampling_rate = def_sampling_rate;
- dbs_tuners_ins.ignore_nice = 0;
-
dbs_timer_init();
}
From 7c9d8c0e84d395a01289ebd1597758939a875a86 Mon Sep 17 00:00:00 2001
From: Dominik Brodowski <linux@dominikbrodowski.net>
Date: Sun, 26 Mar 2006 11:11:03 +0200
Subject: [PATCH 07/10] [PATCH] cpufreq_ondemand: add range check
Assert that cpufreq_target is, at least, called with the minimum frequency
allowed by this policy, not something lower. It triggered problems on ARM.
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
drivers/cpufreq/cpufreq_ondemand.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index cd846f57147e5..956d121cb1615 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -351,6 +351,9 @@ static void dbs_check_cpu(int cpu)
freq_next = (freq_next * policy->cur) /
(dbs_tuners_ins.up_threshold - 10);
+ if (freq_next < policy->min)
+ freq_next = policy->min;
+
if (freq_next <= ((policy->cur * 95) / 100))
__cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L);
}
From eef5167e5045fa8265b3e72cac9dbc4bc7dd82a6 Mon Sep 17 00:00:00 2001
From: "shin, jacob" <jacob.shin@amd.com>
Date: Mon, 27 Mar 2006 09:57:20 -0600
Subject: [PATCH 08/10] [CPUFREQ] hotplug cpu fix for powernow-k8
Andi's previous fix to initialise powernow_data on all siblings
will not work properly with CPU Hotplug.
Signed-off-by: Jacob Shin <jacob.shin@amd.com>
Signed-off-by: Dave Jones <davej@redhat.com>
---
arch/i386/kernel/cpu/cpufreq/powernow-k8.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
index 1e70823e1cb58..712a26bd44579 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
@@ -1095,10 +1095,15 @@ static int __devexit powernowk8_cpu_exit (struct cpufreq_policy *pol)
static unsigned int powernowk8_get (unsigned int cpu)
{
- struct powernow_k8_data *data = powernow_data[cpu];
+ struct powernow_k8_data *data;
cpumask_t oldmask = current->cpus_allowed;
unsigned int khz = 0;
+ data = powernow_data[first_cpu(cpu_core_map[cpu])];
+
+ if (!data)
+ return -EINVAL;
+
set_cpus_allowed(current, cpumask_of_cpu(cpu));
if (smp_processor_id() != cpu) {
printk(KERN_ERR PFX "limiting to CPU %d failed in powernowk8_get\n", cpu);
From 64840e2722aeb789574e336d231bbc6436d51b34 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@osdl.org>
Date: Sat, 25 Mar 2006 01:51:23 -0800
Subject: [PATCH 09/10] [CPUFREQ] powernow: remove private for_each_cpu_mask()
It is unneeded and wrong.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dave Jones <davej@redhat.com>
---
arch/i386/kernel/cpu/cpufreq/powernow-k8.h | 4 ----
1 file changed, 4 deletions(-)
diff --git a/arch/i386/kernel/cpu/cpufreq/powernow-k8.h b/arch/i386/kernel/cpu/cpufreq/powernow-k8.h
index 00ea899c17e1b..79a7c5c87edcf 100644
--- a/arch/i386/kernel/cpu/cpufreq/powernow-k8.h
+++ b/arch/i386/kernel/cpu/cpufreq/powernow-k8.h
@@ -182,10 +182,6 @@ static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);
-#ifndef for_each_cpu_mask
-#define for_each_cpu_mask(i,mask) for (i=0;i<1;i++)
-#endif
-
#ifdef CONFIG_SMP
static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
{
From c326e27eb79e98050d855e371ac534ff4352e910 Mon Sep 17 00:00:00 2001
From: Mattia Dongili <malattia@linux.it>
Date: Mon, 27 Mar 2006 22:55:55 +0200
Subject: [PATCH 10/10] [CPUFREQ] cpufreq_conservative: keep ignore_nice_load
and freq_step values when reselected
Keep the value of ignore_nice_load and freq_step of the conservative
governor after the governor is deselected and reselected.
Signed-off-by: Mattia Dongili <malattia@linux.it>
Signed-off-by: Dave Jones <davej@redhat.com>
---
drivers/cpufreq/cpufreq_conservative.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index a152d2c46be75..037f6bf4543c3 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -88,6 +88,8 @@ static struct dbs_tuners dbs_tuners_ins = {
.up_threshold = DEF_FREQUENCY_UP_THRESHOLD,
.down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD,
.sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR,
+ .ignore_nice = 0,
+ .freq_step = 5,
};
static inline unsigned int get_cpu_idle_time(unsigned int cpu)
@@ -490,8 +492,6 @@ static int cpufreq_governor_dbs(struct cpufreq_policy *policy,
def_sampling_rate = MIN_STAT_SAMPLING_RATE;
dbs_tuners_ins.sampling_rate = def_sampling_rate;
- dbs_tuners_ins.ignore_nice = 0;
- dbs_tuners_ins.freq_step = 5;
dbs_timer_init();
}