linux-kernel - Re: sched: Consequences of integrating the Per Entity Load Tracking Metric into the Load Balancer

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Date:	Fri, 04 Jan 2013 12:41:19 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"svaidy@...ux.vnet.ibm.com" <svaidy@...ux.vnet.ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Paul McKenney <paul.mckenney@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, Paul Turner <pjt@...gle.com>,
	Venki Pallipadi <venki@...gle.com>,
	Robin Randhawa <robin.randhawa@....com>,
	Lists linaro-dev <linaro-dev@...ts.linaro.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Alex Shi <alex.shi@...el.com>, srikar@...ux.vnet.ibm.com
Subject: Re: sched: Consequences of integrating the Per Entity Load Tracking
 Metric into the Load Balancer

On Thu, 2013-01-03 at 16:08 +0530, Preeti U Murthy wrote: 
> Hi Mike,
> 
> Thank you very much for your feedback.Considering your suggestions,I have posted out a 
> proposed solution to prevent select_idle_sibling() from becoming a disadvantage to normal
> load balancing,rather aiding it.
> 
> **This patch is *without* the enablement of the per entity load tracking metric.**
> 
> This is with an intention to correct the existing select_idle_sibling() mess before
> going ahead.

Well, on the bright side, this is much kinder to light load tbench on
4x10 core (+ht) box than current bounce happy select_idle_sibling().  At
the heavy load end I'm losing heaping truckloads of throughput though,
likely some migration rate limiting would fix that up.

select_idle_sibling() doesn't have much of a pretty face these days, but
its evil hag face shows more prominently than ever, so making it dead is
a great goal ;-)

-Mike

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