Re: [PATCH v1 3/4] mm/mmu_gather: Remove encoded_page infrastructure

[Yu Zhao]

On Thu, Aug 10, 2023 at 4:33 AM Ryan Roberts <ryan.roberts@xxxxxxx> wrote:
>
> commit 70fb4fdff582 ("mm: introduce 'encoded' page pointers with
> embedded extra bits") and commit 7cc8f9c7146a ("mm: mmu_gather: prepare
> to gather encoded page pointers with flags") converted mmu_gather for
> dealing with encoded_page, where the bottom 2 bits could encode extra
> flags. Only 1 bit was ever used; to flag whether the page should
> participate in a delayed rmap removal.
>
> Now that the mmu_gather batched rmap removal mechanism has been
> generalized, all pages participate and therefore the flag is unused. So
> let's remove encoded_page to simplify the code. It also gets in the way
> of further optimization which will be done in a follow up patch.

Adding the original author and reviewers... They might want (need) to
take a look at this series.