linux-kernel - Re: [RFC PATCH v2] mm/zswap: store <PAGE

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Message-ID: <CAKEwX=O-_J5Z33XGfUOJDBk8hOsBkgUpDhHMM6rPvP-cu7QASw@mail.gmail.com>
Date: Tue, 5 Aug 2025 11:31:26 -0700
From: Nhat Pham <nphamcs@...il.com>
To: SeongJae Park <sj@...nel.org>
Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, 
	Chengming Zhou <chengming.zhou@...ux.dev>, David Hildenbrand <david@...hat.com>, 
	Johannes Weiner <hannes@...xchg.org>, Jonathan Corbet <corbet@....net>, 
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Michal Hocko <mhocko@...e.com>, 
	Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>, kernel-team@...a.com, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	Takero Funaki <flintglass@...il.com>
Subject: Re: [RFC PATCH v2] mm/zswap: store <PAGE_SIZE compression failed page as-is

On Tue, Aug 5, 2025 at 11:25 AM Nhat Pham <nphamcs@...il.com> wrote:
>
> 1. At store time, if comp_ret or dlen == PAGE_SIZE, treat it as
> compression failure. This means: saving as-is when writeback enabled,
> and rejecting when writeback disabled. Basically:
>
> if (!comp_ret || dlen == PAGE_SIZE) {

Again, comp_ret || dlen == PAGE_SIZE here. Not sure why I kept making
the same brainfart, lol.