Nicolas,
Could you merge the attached commit ? It comes from next branch of
git://git.kernel.org/pub/scm/linux/kernel/git/davej/cpufreq.git. It
should be needed for the current linaro kernel cycle
Regards,
Vincent
From 5cb2c3bd0c5e0f3ced63f250ec2ad59d7c5c626a Mon Sep 17 00:00:00 2001
From: Vincent Guittot <vincent.guit...@linaro.org>
Date: Mon, 7 Feb 2011 17:14:25 +0100
Subject: [PATCH] [CPUFREQ] calculate delay after dbs_check_cpu
calculate ondemand delay after dbs_check_cpu call because it can
modify rate_mult value
use freq_lo_jiffies value for the sub sample period of powersave_bias mode
Signed-off-by: Vincent Guittot <vincent.guit...@linaro.org>
Signed-off-by: Dave Jones <da...@redhat.com>
---
drivers/cpufreq/cpufreq_ondemand.c | 17 +++++++++++------
1 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 58aa85e..059179d 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -642,12 +642,7 @@ static void do_dbs_timer(struct work_struct *work)
unsigned int cpu = dbs_info->cpu;
int sample_type = dbs_info->sample_type;
- /* We want all CPUs to do sampling nearly on same jiffy */
- int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate
- * dbs_info->rate_mult);
-
- if (num_online_cpus() > 1)
- delay -= jiffies % delay;
+ int delay;
mutex_lock(&dbs_info->timer_mutex);
@@ -660,10 +655,20 @@ static void do_dbs_timer(struct work_struct *work)
/* Setup timer for SUB_SAMPLE */
dbs_info->sample_type = DBS_SUB_SAMPLE;
delay = dbs_info->freq_hi_jiffies;
+ } else {
+ /* We want all CPUs to do sampling nearly on
+ * same jiffy
+ */
+ delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate
+ * dbs_info->rate_mult);
+
+ if (num_online_cpus() > 1)
+ delay -= jiffies % delay;
}
} else {
__cpufreq_driver_target(dbs_info->cur_policy,
dbs_info->freq_lo, CPUFREQ_RELATION_H);
+ delay = dbs_info->freq_lo_jiffies;
}
schedule_delayed_work_on(cpu, &dbs_info->work, delay);
mutex_unlock(&dbs_info->timer_mutex);
--
1.7.4.1
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