Re: [PATCH v4 01/16] mm: thp: Batch-collapse PMD with set_ptes()

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On 18.12.23 11:50, Ryan Roberts wrote:
Refactor __split_huge_pmd_locked() so that a present PMD can be
collapsed to PTEs in a single batch using set_ptes(). It also provides a
future opportunity to batch-add the folio to the rmap using David's new
batched rmap APIs.

I'd drop that sentence and rather just say "In the future, we might get rid of the remaining manual loop by using rmap batching.".


This should improve performance a little bit, but the real motivation is
to remove the need for the arm64 backend to have to fold the contpte
entries. Instead, since the ptes are set as a batch, the contpte blocks
can be initially set up pre-folded (once the arm64 contpte support is
added in the next few patches). This leads to noticeable performance
improvement during split.

Acked-by: David Hildenbrand <david@xxxxxxxxxx>

--
Cheers,

David / dhildenb





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