linux-kernel - [PATCH 3/6] cpufreq: Add roll back non-sampling

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Date:	Thu, 23 Dec 2010 14:17:03 +0800
From:	Youquan Song <youquan.song@...el.com>
To:	davej@...hat.com, cpufreq@...r.kernle.org
Cc:	venki@...gle.com, arjan@...ux.intel.com, lenb@...nel.org,
	suresh.b.siddha@...el.com, kent.liu@...el.com,
	chaohong.guo@...el.com, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	Youquan Song <youquan.song@...ux.intel.com>,
	Youquan Song <youquan.song@...el.com>
Subject: [PATCH 3/6] cpufreq: Add roll back non-sampling_window


When sampling window is set to default sampling rate, the sampling window will
roll back to orignal behaviour. The up_threshold and down_differential also set
to original ones.


Signed-off-by: Youquan Song <youquan.song@...el.com>
---
 drivers/cpufreq/cpufreq_ondemand.c |   20 +++++++++++++++++---
 1 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c
index 87aec7f..5242d24 100644
--- a/drivers/cpufreq/cpufreq_ondemand.c
+++ b/drivers/cpufreq/cpufreq_ondemand.c
@@ -469,11 +469,24 @@ static ssize_t store_sampling_window(struct kobject *a, struct attribute *b,
 	if (input > 1000000)
 		input = 1000000;
 
-	if (input < 10000)
-		input = 10000;
+	if (input < dbs_tuners_ins.sampling_rate)
+		input = dbs_tuners_ins.sampling_rate;
 
 	mutex_lock(&dbs_mutex);
 	dbs_tuners_ins.sampling_window = input;
+	/* User set sampling window equal default sampling rate,
+	 * It means that user want disable sampling window, so
+	 * return to legacy sampling mode
+	 * */
+	if (input == dbs_tuners_ins.sampling_rate) {
+		dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
+		dbs_tuners_ins.down_differential =
+			MICRO_FREQUENCY_DOWN_DIFFERENTIAL;
+	} else {
+		dbs_tuners_ins.up_threshold = SAMPLING_WINDOW_UP_THRESHOLD;
+		dbs_tuners_ins.down_differential =
+			SAMPLING_WINDOW_DOWN_DIFFERENTIAL;
+	}
 	mutex_unlock(&dbs_mutex);
 
 	return count;
@@ -720,7 +733,8 @@ static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info)
 		}
 	}
 
-	if (sampling_window_enable)
+	if (sampling_window_enable && (dbs_tuners_ins.sampling_window !=
+						dbs_tuners_ins.sampling_rate))
 		/* Get the average load in the lastest sampling window */
 		max_load_freq = get_load_freq_during_sampling_window(
 				this_dbs_info, max_load_freq,
-- 
1.6.4.2

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