linux-kernel - Re: [RFC PATCH v1 0/4] Kernel thread based async batch migration

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Message-ID: <cc947beb-2b4c-459a-a388-fe020856f523@amd.com>
Date: Fri, 20 Jun 2025 14:28:33 +0530
From: Bharata B Rao <bharata@....com>
To: "Huang, Ying" <ying.huang@...ux.alibaba.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 Jonathan.Cameron@...wei.com, dave.hansen@...el.com, gourry@...rry.net,
 hannes@...xchg.org, mgorman@...hsingularity.net, mingo@...hat.com,
 peterz@...radead.org, raghavendra.kt@....com, riel@...riel.com,
 rientjes@...gle.com, sj@...nel.org, weixugc@...gle.com, willy@...radead.org,
 ziy@...dia.com, dave@...olabs.net, nifan.cxl@...il.com,
 xuezhengchu@...wei.com, yiannis@...corp.com, akpm@...ux-foundation.org,
 david@...hat.com
Subject: Re: [RFC PATCH v1 0/4] Kernel thread based async batch migration

On 20-Jun-25 12:09 PM, Huang, Ying wrote:
> Bharata B Rao <bharata@....com> writes:
> <snip>
> 
> I don't think page flag + scanning is a good idea.If the

If extended page flags is not the ideal location (I chose it in this
version only to get something going quickly), we can look at maintaining
per-pfn allocation for the required hot page metadata separately.

Or is your concern specifically with scanning? What problems do you see?
It is the cost or the possibility of not identifying the migrate-ready
pages in time? Or something else??

Regards,
Bharata.