linux-kernel - [PATCH linux-next] cpufreq: conservative: Fix sampling_down

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Message-ID: <51351CC3.4010301@semaphore.gr>
Date:	Tue, 05 Mar 2013 00:14:27 +0200
From:	Stratos Karafotis <stratosk@...aphore.gr>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	cpufreq@...r.kernel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH linux-next] cpufreq: conservative: Fix sampling_down_factor
 functionality

sampling_down_factor tunable is unused since commit
8e677ce83bf41ba9c74e5b6d9ee60b07d4e5ed93 (4 years ago).

This patch restores the original functionality.

Signed-off-by: Stratos Karafotis <stratosk@...aphore.gr>
---
 drivers/cpufreq/cpufreq_conservative.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c
index 4fd0006..4b27c21 100644
--- a/drivers/cpufreq/cpufreq_conservative.c
+++ b/drivers/cpufreq/cpufreq_conservative.c
@@ -87,6 +87,12 @@ static void cs_check_cpu(int cpu, unsigned int load)
                return;
        }

+       /* if sampling_down_factor is active break out early */
+       if (++dbs_info->down_skip < cs_tuners.sampling_down_factor)
+               return;
+
+       dbs_info->down_skip = 0;
+
        /*
         * The optimal frequency is the frequency that is the lowest that can
         * support the current CPU usage without triggering the up policy. To be
-- 
1.8.1.4


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