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

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Date:	Thu, 13 Dec 2012 10:43:52 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>
CC:	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 12/13/2012 10:17 AM, Alex Shi wrote:
> On 12/12/2012 09:31 PM, Vincent Guittot wrote:
>> During the creation of sched_domain, we define a pack buddy CPU for each CPU
>> when one is available. We want to pack at all levels where a group of CPU can
>> be power gated independently from others.
>> On a system that can't power gate a group of CPUs independently, the flag is
>> set at all sched_domain level and the buddy is set to -1. This is the default
>> behavior.
>> On a dual clusters / dual cores system which can power gate each core and
>> cluster independently, the buddy configuration will be :
>>
>>       | Cluster 0   | Cluster 1   |
>>       | CPU0 | CPU1 | CPU2 | CPU3 |
>> -----------------------------------
>> buddy | CPU0 | CPU0 | CPU0 | CPU2 |
>>
>> Small tasks tend to slip out of the periodic load balance so the best place
>> to choose to migrate them is during their wake up. The decision is in O(1) as
>> we only check again one buddy CPU
> 
> Just have a little worry about the scalability on a big machine, like on
> a 4 sockets NUMA machine * 8 cores * HT machine, the buddy cpu in whole
> system need care 64 LCPUs. and in your case cpu0 just care 4 LCPU. That
> is different on task distribution decision.

In above big machine example, only one buddy cpu is not sufficient on
each of level, like for 4 sockets level, maybe tasks can just full fill
2 sockets, then we just use 2 sockets, that is more performance/power
efficient. But one buddy cpu here need to spread tasks to 4 sockets all.


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