Re: [v2 00/16] mm: PMD-level swap entries for anonymous THPs

[David Hildenbrand (Arm)]

On 6/9/26 16:29, Usama Arif wrote:
> 
> 
> On 02/06/2026 15:24, Usama Arif wrote:
>> When reclaim swaps out a PMD-mapped anonymous THP today, the PMD is
>> split into 512 PTE-level swap entries via TTU_SPLIT_HUGE_PMD before
>> unmap.
>>
>> This series introduces a PMD-level swap entry. The huge mapping is
>> preserved across the swap round-trip, and do_huge_pmd_swap_page()
>> resolves the entire 2 MB region in a single fault on swap-in,
>> no khugepaged involvement is needed. swap_map metadata is identical
>> either way (512 single-slot counts), so the PTE split buys nothing
>> on the swap side, it is purely a page-table representation change.
>>
> 
> Hello!
> 
> Just following up if there were any reviews/comments on this series!
> 
> I know its a large series but was just checking if there was any
> feedback?

It shall be reviewed. We just finished the mTHP khugepaged review to get it into
7.2, so we've all been rather busy.

(I mean, just take a look at the THP-related flood of patches we are fighting
with on a daily basis, it's not funny anymore)

This is clearly going to be 7.3 material, so there is plenty of time given that
the merge window is about to open soon.

-- 
Cheers,

David