linux-kernel - [RFC PATCH v1 1/3] sched: add more levels of sched

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Date:	Mon, 27 Apr 2009 02:16:44 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	Gregory Haskins <gregory.haskins@...il.com>,
	Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arun Bharadwaj <arun@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: [RFC PATCH v1 1/3] sched: add more levels of sched_mc

Add few more levels to sched_mc for cpu evacuation.
These levels will try to keep CPU cores free in order
to reduce power consumption.

sched_mc=3 to 5 enables cpu evacuation

** This is a RFC patch for discussion ***

Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
---

 include/linux/sched.h |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index b4c38bc..8b27295 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -788,6 +788,10 @@ enum powersavings_balance_level {
 	POWERSAVINGS_BALANCE_WAKEUP,	/* Also bias task wakeups to semi-idle
 					 * cpu package for power savings
 					 */
+	POWERSAVINGS_INCREASE_GROUP_CAPACITY_1, /* 1*imbalalance_pct = 125% */
+	POWERSAVINGS_INCREASE_GROUP_CAPACITY_2, /* 2*imbalalance_pct = 150% */
+	POWERSAVINGS_INCREASE_GROUP_CAPACITY_3, /* 4*imbalalance_pct = 200% */
+
 	MAX_POWERSAVINGS_BALANCE_LEVELS
 };
 

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