Re: [PATCH -V11 2/9] mm/migrate: update node demotion order on hotplug events

[Huang, Ying]

Hi, Abhishek,

Abhishek Goel <huntbag@xxxxxxxxxxxxxxxxxx> writes:

> On 24/02/22 05:35, Dave Hansen wrote:
>> On 2/23/22 15:02, Abhishek Goel wrote:
>>> If needed, I will provide experiment results and traces that were used
>>> to conclude this.
>> It would be great if you can provide some more info.  Even just a CPU
>> time profile would be helpful.
>
> Average total time taken for SMT=8 to SMT=1 in v5.14 : 20s
>
> Average total time taken for SMT=8 to SMT=1 in v5.15 : 36s
>
> (Observed in system with 150+ CPUs )

We have run into a memory hotplug regression before.  Let's check
whether the problem is similar.  Can you try the below debug patch?

Best Regards,
Huang, Ying

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