linux-kernel - [RFC PATCH 11/16 v3] Make wakeup bias threshold changeable via sysctl

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Message-Id: <1401431772-14320-12-git-send-email-yuyang.du@intel.com>
Date:	Fri, 30 May 2014 14:36:07 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	mingo@...hat.com, peterz@...radead.org, rafael.j.wysocki@...el.com,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:	arjan.van.de.ven@...el.com, len.brown@...el.com,
	alan.cox@...el.com, mark.gross@...el.com, pjt@...gle.com,
	bsegall@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, rajeev.d.muralidhar@...el.com,
	vishwesh.m.rudramuni@...el.com, nicole.chalhoub@...el.com,
	ajaya.durg@...el.com, harinarayanan.seshadri@...el.com,
	jacob.jun.pan@...ux.intel.com, fengguang.wu@...el.com,
	yuyang.du@...el.com
Subject: [RFC PATCH 11/16 v3] Make wakeup bias threshold changeable via sysctl

In wakeup balance, we bias wakee and waker (in this order) if it is capable
of handling the wakee task.

sysctl_sched_cc_wakeup_threshold is the threshold to see whether the CPU
is capable, and can be changed by sysctl tool

Signed-off-by: Yuyang Du <yuyang.du@...el.com>
---
 include/linux/sched/sysctl.h |    1 +
 kernel/sysctl.c              |    7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h
index f8a3e0a..f1e90c7 100644
--- a/include/linux/sched/sysctl.h
+++ b/include/linux/sched/sysctl.h
@@ -38,6 +38,7 @@ extern unsigned int sysctl_sched_child_runs_first;
 
 #ifdef CONFIG_SMP
 extern unsigned int sysctl_sched_cc_sum_period;
+extern unsigned int sysctl_sched_cc_wakeup_threshold;
 #endif
 
 enum sched_tunable_scaling {
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 13aea95..77a5aa5 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1098,6 +1098,13 @@ static struct ctl_table kern_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec,
 	},
+	{
+		.procname	= "sched_cc_wakeup_threshold",
+		.data		= &sysctl_sched_cc_wakeup_threshold,
+		.maxlen		= sizeof(sysctl_sched_cc_wakeup_threshold),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
 #endif
 	{ }
 };
-- 
1.7.9.5

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