linux-kernel - Re: [RFC PATCH v2 3/6] sched: pack small tasks

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Message-ID: <50CAC905.9070100@intel.com>
Date:	Fri, 14 Dec 2012 14:36:53 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Mike Galbraith <bitbucket@...ine.de>
CC:	Vincent Guittot <vincent.guittot@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linaro-dev@...ts.linaro.org, peterz@...radead.org,
	mingo@...nel.org, linux@....linux.org.uk, pjt@...gle.com,
	santosh.shilimkar@...com, Morten.Rasmussen@....com,
	chander.kashyap@...aro.org, cmetcalf@...era.com,
	tony.luck@...el.com, preeti@...ux.vnet.ibm.com,
	paulmck@...ux.vnet.ibm.com, tglx@...utronix.de,
	len.brown@...el.com, arjan@...ux.intel.com,
	amit.kucheria@...aro.org, viresh.kumar@...aro.org
Subject: Re: [RFC PATCH v2 3/6] sched: pack small tasks

On 12/14/2012 12:45 PM, Mike Galbraith wrote:
>> > Do you have further ideas for buddy cpu on such example?
>>> > > 
>>> > > Which kind of sched_domain configuration have you for such system ?
>>> > > and how many sched_domain level have you ?
>> > 
>> > it is general X86 domain configuration. with 4 levels,
>> > sibling/core/cpu/numa.
> CPU is a bug that slipped into domain degeneration.  You should have
> SIBLING/MC/NUMA (chasing that down is on todo).

Maybe.
the CPU/NUMA is different on domain flags, CPU has SD_PREFER_SIBLING.
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