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

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Message-ID: <CAGsJ_4zB4ygGCN4JTx+AW+XAUm8WtFVLVesStuDHc8S-HT0ihQ@mail.gmail.com>
Date: Fri, 19 Sep 2025 05:35:29 +0800
From: Barry Song <21cnbao@...il.com>
To: Chris Li <chrisl@...nel.org>
Cc: Kairui Song <ryncsn@...il.com>, linux-mm@...ck.org, 
	Andrew Morton <akpm@...ux-foundation.org>, Matthew Wilcox <willy@...radead.org>, 
	Hugh Dickins <hughd@...gle.com>, Baoquan He <bhe@...hat.com>, Nhat Pham <nphamcs@...il.com>, 
	Kemeng Shi <shikemeng@...weicloud.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>, 
	Ying Huang <ying.huang@...ux.alibaba.com>, Johannes Weiner <hannes@...xchg.org>, 
	David Hildenbrand <david@...hat.com>, Yosry Ahmed <yosryahmed@...gle.com>, 
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Zi Yan <ziy@...dia.com>, 
	linux-kernel@...r.kernel.org, Kairui Song <kasong@...cent.com>
Subject: Re: [PATCH v4 01/15] docs/mm: add document for swap table

> > I’m not entirely sure what you mean by “page table page.”
>
> The page that gets pointed by the page table, or the page that holds the PTE.
>
> > 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.
>
> That sounds good. Thanks for the suggestion.
> I take your suggestion with some small modifications, mostly to
> clarify the total size is the total size of one cluster of swap
> tables. The total size of all swap tables in a swap file is much
> bigger.
>
> How about this:
>
> A swap table is an array of pointers. Each pointer is the same size as a PTE.
> The size of a swap table for one swap cluster typically matches a PTE
> page table,
> which is one page on modern 64-bit systems.

Acked.

>
> Chris

Thanks
Barry