linux-kernel - Re: [RFC PATCH 0/4] Kernel daemon for detecting and promoting hot pages

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Message-ID: <1afff957-4e53-4c86-a6de-a1075ec13d50@amd.com>
Date: Tue, 18 Mar 2025 12:03:58 +0530
From: Raghavendra K T <raghavendra.kt@....com>
To: SeongJae Park <sj@...nel.org>, Bharata B Rao <bharata@....com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 AneeshKumar.KizhakeVeetil@....com, Hasan.Maruf@....com,
 Jonathan.Cameron@...wei.com, Michael.Day@....com, akpm@...ux-foundation.org,
 dave.hansen@...el.com, david@...hat.com, feng.tang@...el.com,
 gourry@...rry.net, hannes@...xchg.org, honggyu.kim@...com, hughd@...gle.com,
 jhubbard@...dia.com, k.shutemov@...il.com, kbusch@...a.com,
 kmanaouil.dev@...il.com, leesuyeon0506@...il.com, leillc@...gle.com,
 liam.howlett@...cle.com, mgorman@...hsingularity.net, mingo@...hat.com,
 nadav.amit@...il.com, nphamcs@...il.com, peterz@...radead.org,
 riel@...riel.com, rientjes@...gle.com, rppt@...nel.org, shivankg@....com,
 shy828301@...il.com, vbabka@...e.cz, weixugc@...gle.com,
 willy@...radead.org, ying.huang@...ux.alibaba.com, ziy@...dia.com,
 dave@...olabs.net, yuanchu@...gle.com, hyeonggon.yoo@...com,
 Harry Yoo <harry.yoo@...cle.com>
Subject: Re: [RFC PATCH 0/4] Kernel daemon for detecting and promoting hot
 pages



On 3/17/2025 3:30 AM, SeongJae Park wrote:
> + Harry, who was called Hyeonggon before.
>>
>> I am also working with Raghu to integrate his kmmdscan [3] as the
>> hotness source and use kpromoted for migration.
> 
> Raghu also mentioned he would try to take a time to look into DAMON if there is
> anything that he could reuse for the purpose.  I'm curious if he was able to
> find something there.
> 
[...]
Hello SJ,

I did take a look at DAMON vaddr and paddr implementation. Also
wondering how can I optimize hotness data collected by kmmscand.

DAMON regions should be very helpful here, But I am not there yet.

will surely need help brainstorming session post my next RFC.

Thanks and Regards
- Raghu