linux-kernel - Re: [RFC PATCH v0 0/2] Batch migration for NUMA balancing

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Message-ID: <aC9hqyuqeGB457Cq@gourry-fedora-PF4VCD3F>
Date: Thu, 22 May 2025 13:40:59 -0400
From: Gregory Price <gourry@...rry.net>
To: SeongJae Park <sj@...nel.org>
Cc: Bharata B Rao <bharata@....com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Jonathan.Cameron@...wei.com,
	dave.hansen@...el.com, hannes@...xchg.org,
	mgorman@...hsingularity.net, mingo@...hat.com, peterz@...radead.org,
	raghavendra.kt@....com, riel@...riel.com, rientjes@...gle.com,
	weixugc@...gle.com, willy@...radead.org,
	ying.huang@...ux.alibaba.com, ziy@...dia.com, dave@...olabs.net,
	nifan.cxl@...il.com, joshua.hahnjy@...il.com,
	xuezhengchu@...wei.com, yiannis@...corp.com,
	akpm@...ux-foundation.org, david@...hat.com
Subject: Re: [RFC PATCH v0 0/2] Batch migration for NUMA balancing

On Thu, May 22, 2025 at 09:30:23AM -0700, SeongJae Park wrote:
> On Wed, 21 May 2025 23:08:16 -0400 Gregory Price <gourry@...rry.net> wrote:
> 
> > 
> > It seems to me that DAMON might make use of the batch migration
> > interface, so if you need any changes or extensions, it might be good
> > for you (SJ) to take a look at that for us.
> 
> For batch migration interface, though, to be honest I don't find very clear
> DAMON's usage of it, since DAMON does region-based sort of batched migration.
> Again, I took only a glance on migration batching part and gonna take more time
> to the details.
> 

DAMON would identify a set of PFNs or Folios to migrate, at some point,
wouldn't it be beneficial to DAMON to simply re-use:

int migrate_misplaced_folio_batch(struct list_head *folio_list, int node)

If not, then why?

That's why I mean by what would DAMON want out of such an interface.
Not the async part, but the underlying migration functions.

~Gregory