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

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Message-ID: <20150617224601.GE1244@intel.com>
Date:	Thu, 18 Jun 2015 06:46:01 +0800
From:	Yuyang Du <yuyang.du@...el.com>
To:	Wanpeng Li <wanpeng.li@...mail.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 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?
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