linux-kernel - Re: [PATCH 1/8] mm: implement cleancache

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Message-ID: <CAJuCfpFs5aKv8E96YC_pasNjH6=eukTuS2X8f=nBGiiuE0Nwhg@mail.gmail.com>
Date: Mon, 13 Oct 2025 08:43:16 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: akpm@...ux-foundation.org, david@...hat.com, lorenzo.stoakes@...cle.com, 
	Liam.Howlett@...cle.com, vbabka@...e.cz, alexandru.elisei@....com, 
	peterx@...hat.com, sj@...nel.org, rppt@...nel.org, mhocko@...e.com, 
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	robin.murphy@....com, hannes@...xchg.org, zhengqi.arch@...edance.com, 
	shakeel.butt@...ux.dev, axelrasmussen@...gle.com, yuanchu@...gle.com, 
	weixugc@...gle.com, minchan@...nel.org, linux-mm@...ck.org, 
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	iommu@...ts.linux.dev, Minchan Kim <minchan@...gle.com>
Subject: Re: [PATCH 1/8] mm: implement cleancache

On Sun, Oct 12, 2025 at 11:44 PM Christoph Hellwig <hch@...radead.org> wrote:
>
> Please don't add abstractions just because you can.  Just call directly
> into your gcma code instead of adding a costly abstraction with a single
> user.  That'll also make it much eaiser to review what GCMA actually
> does.

Are you suggesting to fold cleancache into GCMA? GCMA is the first
backend donating its memory to the cleancache but other memory
carveout owners can do that too. The next two on my list are MTE tag
storage and memory reserved by kdump.
Also note that the original GCMA proposal from 2015 [1] used both
cleancache and frontswap to donate its memory. We don't have frontswap
today, but this shows that it doesn't have to be a 1-to-1 relation
between GCMA and cleancache.
Thanks,
Suren.

[1] https://lore.kernel.org/all/1424721263-25314-4-git-send-email-sj38.park@gmail.com/