Re: [PATCH v4 01/15] docs/mm: add document for swap table

[Barry Song]

On Thu, Sep 18, 2025 at 3:03 PM Chris Li <chrisl@xxxxxxxxxx> wrote:
>
> Hi Barry,
>
> How about this:
>
> A swap table stores one cluster worth of swap cache values, which is
> exactly one page table page on most morden 64 bit systems. This is not
> coincidental because the cluster size is determined by the huge page size.

I’d phrase it as “PMD huge page,” since we also have “PUD huge page.”

> The swap table is holding an array of pointers, which have the same
> size as the PTE. The size of the swap table should match the page table
> page.
>

I’m not entirely sure what you mean by “page table page.”
My understanding is that you’re saying:
The swap table contains an array of pointers, each the same size as a PTE,
so its total size typically matches a PTE page table—one page on modern
64-bit systems.

> If that sounds OK, I will send an incremental patch to Andrew.
>
> Chris

Thanks
Barry