linux-kernel - Re: [Question] sched：the load is unbalanced in the VM overcommitment scenario

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Message-ID: <672a45a5-722f-af57-dad4-a285acb0e53a@huawei.com>
Date: Sat, 14 Sep 2024 10:15:47 +0800
From: zhengzucheng <zhengzucheng@...wei.com>
To: Waiman Long <longman@...hat.com>, <peterz@...radead.org>,
	<juri.lelli@...hat.com>, <vincent.guittot@...aro.org>,
	<dietmar.eggemann@....com>, <rostedt@...dmis.org>, <bsegall@...gle.com>,
	<mgorman@...e.de>, <vschneid@...hat.com>, <oleg@...hat.com>, Frederic
 Weisbecker <frederic@...nel.org>, <mingo@...nel.org>, <peterx@...hat.com>,
	<tj@...nel.org>, <tjcao980311@...il.com>
CC: <linux-kernel@...r.kernel.org>
Subject: Re: [Question] sched：the load is unbalanced in the VM overcommitment scenario


在 2024/9/14 1:17, Waiman Long 写道:
> you don't actually need to use 2 different cpusets if they all get the 
> same set of CPUs and memory nodes

Yes, you're right. The purpose of setting two different cpusets is to 
simulate the scenario of two VMs.

each cpuset is a VM.

For example, the VM configuration is as follows:

<domain type='kvm' id='12676'>
   <name>master</name>
   <vcpu placement='static' cpuset='0-3,80-83'>8</vcpu>
   <iothreads>1</iothreads>
   <iothreadids>
     <iothread id='1'/>
   </iothreadids>
   <cputune>
     <vcpupin vcpu='0' cpuset='0-3,80-83'/>
     <vcpupin vcpu='1' cpuset='0-3,80-83'/>
     <vcpupin vcpu='2' cpuset='0-3,80-83'/>
     <vcpupin vcpu='3' cpuset='0-3,80-83'/>
     <vcpupin vcpu='4' cpuset='0-3,80-83'/>
     <vcpupin vcpu='5' cpuset='0-3,80-83'/>
     <vcpupin vcpu='6' cpuset='0-3,80-83'/>
     <vcpupin vcpu='7' cpuset='0-3,80-83'/>
     <emulatorpin cpuset='0-79'/>
   </cputune>
   <numatune>
     <memory mode='strict' nodeset='0'/>
     <memnode cellid='0' mode='strict' nodeset='0'/>
   </numatune>