linux-kernel - [RFC] cpufreq: governor: Set MIN_LATENCY

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Message-Id: <472e2bac1fc4a2589651beddbfaf6da53500d12e.1361871582.git.viresh.kumar@linaro.org>
Date:	Tue, 26 Feb 2013 15:13:32 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	rjw@...k.pl, trenn@...e.de
Cc:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	robin.randhawa@....com, Steve.Bannister@....com,
	Liviu.Dudau@....com, charles.garcia-tobin@....com,
	Viresh Kumar <viresh.kumar@...aro.org>
Subject: [RFC] cpufreq: governor: Set MIN_LATENCY_MULTIPLIER to 20

Currently MIN_LATENCY_MULTIPLIER is set defined as 100 and so on a system with
transition latency of 1 ms, the minimum sampling time comes to be around 100 ms.
That is quite big if you want to get better performance for your system.

Redefine MIN_LATENCY_MULTIPLIER to 20 so that we can support 20ms sampling rate
for such platforms.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
---

Hi Guys,

I really don't know how this figure (100) came initially, but we really need to
have 20ms support for my platform: ARM TC2.

Pushed here:

http://git.linaro.org/gitweb?p=people/vireshk/linux.git;a=shortlog;h=refs/heads/cpufreq-fixes

 drivers/cpufreq/cpufreq_governor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h
index d2ac911..adb8e30 100644
--- a/drivers/cpufreq/cpufreq_governor.h
+++ b/drivers/cpufreq/cpufreq_governor.h
@@ -34,7 +34,7 @@
  */
 #define MIN_SAMPLING_RATE_RATIO			(2)
 #define LATENCY_MULTIPLIER			(1000)
-#define MIN_LATENCY_MULTIPLIER			(100)
+#define MIN_LATENCY_MULTIPLIER			(20)
 #define TRANSITION_LATENCY_LIMIT		(10 * 1000 * 1000)
 
 /* Ondemand Sampling types */
-- 
1.7.12.rc2.18.g61b472e


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