Re: [v1 1/2] mm/damon: have damon_get_folio return folio even for tail pages

[SeongJae Park <sj@kernel.org>]

On Thu, 16 Jan 2025 14:44:35 +0000 Usama Arif <usamaarif642@gmail.com> wrote:

> This effectively adds support for large folios in damon for paddr,
> as damon_pa_mkold/young won't get a null folio from this function
> and won't ignore it, hence access will be checked and reported.
> This also means that larger folios will be considered for
> different DAMOS actions like pageout, prioritization and migration.
> As these DAMOS actions will consider larger folios, iterate through
> the region at folio_size and not PAGE_SIZE intervals.
> This should not have an affect on vaddr, as damon_young_pmd_entry
> considers pmd entries.

This patch will improve both accuracy of monitoring results and efficiency of
DAMOS for paddr use cases on THP-enabled systems.  Thank you Usama!

> 
> Signed-off-by: Usama Arif <usamaarif642@gmail.com>

Reviewed-by: SeongJae Park <sj@kernel.org>


Thanks,
SJ

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