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

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Message-ID: <f5edb9dc-8b25-47c2-9905-09e88e41861b@intel.com>
Date:   Wed, 23 Feb 2022 16:05:59 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Abhishek Goel <huntbag@...ux.vnet.ibm.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Zi Yan <ziy@...dia.com>, David Hildenbrand <david@...hat.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Huang Ying <ying.huang@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH -V11 2/9] mm/migrate: update node demotion order on
 hotplug events

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.

It would also be great to understand more about what "hotplug on power
systems" actually means.  Is this a synthetic benchmark, or are actual
end-users running into this issue?  Are entire nodes of CPUs going
offline?  Or is this just doing an offline/online of CPU 22 in a 100-CPU
NUMA node?