linux-kernel - Re: [Resend PATCH v8 0/4] sched: Rewrite runnable load and utilization average tracking

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Date:	Thu, 18 Jun 2015 19:48:00 +0800
From:	Wanpeng Li <wanpeng.li@...mail.com>
To:	Yuyang Du <yuyang.du@...el.com>
CC:	Boqun Feng <boqun.feng@...il.com>, mingo@...nel.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org, pjt@...gle.com,
	bsegall@...gle.com, morten.rasmussen@....com,
	vincent.guittot@...aro.org, dietmar.eggemann@....com,
	len.brown@...el.com, rafael.j.wysocki@...el.com,
	fengguang.wu@...el.com, srikar@...ux.vnet.ibm.com
Subject: Re: [Resend PATCH v8 0/4] sched: Rewrite runnable load and
 utilization average tracking



On 6/18/15 6:46 AM, Yuyang Du wrote:
> On Thu, Jun 18, 2015 at 02:31:00PM +0800, Wanpeng Li wrote:
>> On 6/17/15 11:11 AM, Yuyang Du wrote:
>>> Hi,
>>>
>>> The sched_debug is informative, lets first give it some analysis.
>>>
>>> The workload is 12 CPU hogging tasks (always runnable) and 1 dbench
>>> task doing fs ops (70% runnable) running at the same time.
>>>
>>> Actually, these 13 tasks are in a task group /autogroup-9617, which
>>> has weight 1024.
>>>
>>> So the 13 tasks at most can contribute to an average of 79 (=1024/13)
>>> to the group entity's load_avg:
>>>
>>> cfs_rq[0]:/autogroup-9617
>>> .se->load.weight               : 2
>>> .se->avg.load_avg              : 0
>>>
>>> cfs_rq[1]:/autogroup-9617
>>> .se->load.weight               : 80
>>> .se->avg.load_avg              : 79
>>>
>>> cfs_rq[2]:/autogroup-9617
>>> .se->load.weight               : 79
>>> .se->avg.load_avg              : 78
>>>
>>> cfs_rq[3]:/autogroup-9617
>>> .se->load.weight               : 80
>>> .se->avg.load_avg              : 81
>>>
>>> cfs_rq[4]:/autogroup-9617
>>> .se->load.weight               : 80
>>> .se->avg.load_avg              : 79
>>>
>>> cfs_rq[5]:/autogroup-9617
>>> .se->load.weight               : 79
>>> .se->avg.load_avg              : 77
>>>
>>> cfs_rq[6]:/autogroup-9617
>>> .se->load.weight               : 159
>>> .se->avg.load_avg              : 156
>>>
>>> cfs_rq[7]:/autogroup-9617
>>> .se->load.weight               : 64  (dbench)
>>> .se->avg.load_avg              : 50
>> How you figure out this one is dbench?
>>
> dbench is on CPU7 and running there?

Sorry, do you mean you pin dbench to CPU7?

Regards,
Wanpeng Li

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