linux-kernel - Re: [LSF/MM/BPF TOPIC] Overhauling hot page detection and promotion based on PTE A bit scanning

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Message-ID: <dccf7286-2ab2-4a48-92fc-49b3a4c09e1d@amd.com>
Date: Fri, 24 Jan 2025 14:24:40 +0530
From: Raghavendra K T <raghavendra.kt@....com>
To: SeongJae Park <sj@...nel.org>
Cc: linux-mm@...ck.org, akpm@...ux-foundation.org,
 lsf-pc@...ts.linux-foundation.org, bharata@....com, gourry@...rry.net,
 nehagholkar@...a.com, abhishekd@...a.com, ying.huang@...ux.alibaba.com,
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 Hasan.Maruf@....com, david@...hat.com, willy@...radead.org,
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Subject: Re: [LSF/MM/BPF TOPIC] Overhauling hot page detection and promotion
 based on PTE A bit scanning

On 1/23/2025 11:50 PM, SeongJae Park wrote:
> Hi Raghavendra,
> 
> On Thu, 23 Jan 2025 10:57:21 +0000 Raghavendra K T <raghavendra.kt@....com> wrote:
> 
>> Bharata and I would like to propose the following topic for LSFMM.
>>
>> Topic: Overhauling hot page detection and promotion based on PTE A bit scanning.
> 
> Thank you for proposing this.  I'm interested in this!
> 

Thank you.

[...]

>> virtual vs physical address based scanning,
> 
> DAMON supports both virtual and physical address spaces monitoring.  DAMON's
> pages migration is currently not supported for virtual address spaces, though I
> believe adding the support is not difficult.
> 

Will check this.

[...]

>>
>> 3. Discuss how hardware provided hotness info (like AMD IBS) can further aid
>> promotion. Bharata had posted an RFC [4] on this a while back.
> 
> Maybe CXL Hotness Monitoring Unit could also be an interesting thing to discuss
> together.
> 

Definitely.

>>
>> 4. Overlap with DAMON and potential reuse.
> 
> I confess that it seems some of the works might overlap with DAMON to my biased
> eyes.  I'm looking forward to attend this session, to make it less biased and
> more aligned with people :)
> 

Yes. Agree.

>>   
>> Links:
>>
>> [1] https://lore.kernel.org/all/20241201153818.2633616-1-raghavendra.kt@amd.com/
>> [2] https://lore.kernel.org/linux-mm/20241226012833.rmmbkws4wdhzdht6@ed.ac.uk/T/
>> [3] https://lore.kernel.org/lkml/Z4XUoWlU-UgRik18@gourry-fedora-PF4VCD3F/T/
>> [4] https://lore.kernel.org/lkml/20230208073533.715-2-bharata@amd.com/
> 
> Again, thank you for proposing this topic, and I wish to see you at Montreal!
> 

Same here .. Thank you :)

- Raghu