linux-kernel - [PATCH 15/19] smart: decrease default rt_period/rt

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Message-Id: <1409848265-17150-15-git-send-email-klamm@yandex-team.ru>
Date:	Thu,  4 Sep 2014 20:31:01 +0400
From:	klamm@...dex-team.ru
To:	peterz@...radead.org, mingo@...hat.com,
	linux-kernel@...r.kernel.org
Cc:	stfomichev@...dex-team.ru, Roman Gushchin <klamm@...dex-team.ru>
Subject: [PATCH 15/19] smart: decrease default rt_period/rt_runtime values

From: Roman Gushchin <klamm@...dex-team.ru>

By default, rt_period is 1s and rt_runtime is 0.95s. These values
are to high to achieve acceptable system responsibility under high
rt load. Decrease it to 100ms and 99ms respectively.

Signed-off-by: Roman Gushchin <klamm@...dex-team.ru>
---
 kernel/sched/core.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 0f25fe0..a1b116e 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -282,19 +282,26 @@ const_debug unsigned int sysctl_sched_nr_migrate = 32;
  */
 const_debug unsigned int sysctl_sched_time_avg = MSEC_PER_SEC;
 
+#ifdef CONFIG_SMART
+#define DEFAULT_SCHED_RT_PERIOD 100000
+#define DEFAULT_SCHED_RT_RUNTIME 99000
+
+#else
+#define DEFAULT_SCHED_RT_PERIOD 1000000
+#define DEFAULT_SCHED_RT_RUNTIME 950000
+#endif
+
 /*
  * period over which we measure -rt task cpu usage in us.
- * default: 1s
  */
-unsigned int sysctl_sched_rt_period = 1000000;
+unsigned int sysctl_sched_rt_period = DEFAULT_SCHED_RT_PERIOD;
 
 __read_mostly int scheduler_running;
 
 /*
  * part of the period that we allow rt tasks to run in us.
- * default: 0.95s
  */
-int sysctl_sched_rt_runtime = 950000;
+int sysctl_sched_rt_runtime = DEFAULT_SCHED_RT_RUNTIME;
 
 
 
-- 
1.9.3

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