linux-kernel - Re: [PATCH v2] mm/zswap: store <PAGE_SIZE compression failed page as-is

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Message-ID: <CAF8kJuNEeQ14p-VpgRvTJ0YiXLHbc4Y8wSrOOMsnug8oP_bOHg@mail.gmail.com>
Date: Fri, 15 Aug 2025 15:38:06 -0700
From: Chris Li <chrisl@...nel.org>
To: Hugh Dickins <hughd@...gle.com>
Cc: SeongJae Park <sj@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Chengming Zhou <chengming.zhou@...ux.dev>, David Hildenbrand <david@...hat.com>, 
	Johannes Weiner <hannes@...xchg.org>, Nhat Pham <nphamcs@...il.com>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	Takero Funaki <flintglass@...il.com>
Subject: Re: [PATCH v2] mm/zswap: store <PAGE_SIZE compression failed page as-is

On Wed, Aug 13, 2025 at 11:58 AM Hugh Dickins <hughd@...gle.com> wrote:
>
> On Wed, 13 Aug 2025, Chris Li wrote:
> >
> > I know Hugh has some idea to store incompressible pages in the swap
> > cache as well. Hugh?
>
> No, I don't have any idea or plan to store incompressible pages in the
> swap cache myself.  But yes, incompressible pages could well be "stored"
> in the swap cache.

Sorry Hugh, I don't mean to assign you more work. Just brainstorming.
Yes it could. The pros will be no swap fault. The cons is breaking the
zswap LRU ordering.

Chris