linux-kernel - Re: [RFC PATCH 2/2] zsmalloc: chain-length configuration should consider other metrics

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Message-ID: <aVyYuS_usi-lpHkM@gondor.apana.org.au>
Date: Tue, 6 Jan 2026 13:08:09 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Sergey Senozhatsky <senozhatsky@...omium.org>
Cc: Yosry Ahmed <yosry.ahmed@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nhat Pham <nphamcs@...il.com>, Minchan Kim <minchan@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Brian Geffon <bgeffon@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [RFC PATCH 2/2] zsmalloc: chain-length configuration should
 consider other metrics

On Tue, Jan 06, 2026 at 01:22:45PM +0900, Sergey Senozhatsky wrote:
> On (26/01/06 13:20), Sergey Senozhatsky wrote:
> [..]
> > > I am not sure tbh, adding Herbert here. I remember looking at the code
> > > in scomp_acomp_comp_decomp() at some point, and I think it will take
> > > care of non-contiguous SG-lists. Not sure if that's the correct place to
> > > look tho.
> > 
> > Ah, so it does kmap under the hood.  I suppose that can work.
> 
> I'm hallucinating, sorry.  Yeah, let's hear from Herbert what's
> the direction here.

I have not implemented the underlying SG support yet because
there are no users in the kernel as of now.  But if this is
useful for you then we can certainly do this, at least for
LZO which is fairly simple.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt