linux-kernel - RE: [PATCH v13 22/22] mm: zswap: Batched zswap_compress() with compress batching of large folios.

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Message-ID: <SJ2PR11MB847264DDE6420139C9FF0749C9A0A@SJ2PR11MB8472.namprd11.prod.outlook.com>
Date: Wed, 10 Dec 2025 05:36:26 +0000
From: "Sridhar, Kanchana P" <kanchana.p.sridhar@...el.com>
To: Herbert Xu <herbert@...dor.apana.org.au>, Yosry Ahmed
	<yosry.ahmed@...ux.dev>
CC: SeongJae Park <sj@...nel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>, "nphamcs@...il.com"
	<nphamcs@...il.com>, "chengming.zhou@...ux.dev" <chengming.zhou@...ux.dev>,
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	<ardb@...nel.org>, "ebiggers@...gle.com" <ebiggers@...gle.com>,
	"surenb@...gle.com" <surenb@...gle.com>, "Accardi, Kristen C"
	<kristen.c.accardi@...el.com>, "Gomes, Vinicius" <vinicius.gomes@...el.com>,
	"Feghali, Wajdi K" <wajdi.k.feghali@...el.com>, "Gopal, Vinodh"
	<vinodh.gopal@...el.com>, "Sridhar, Kanchana P"
	<kanchana.p.sridhar@...el.com>
Subject: RE: [PATCH v13 22/22] mm: zswap: Batched zswap_compress() with
 compress batching of large folios.


> -----Original Message-----
> From: Herbert Xu <herbert@...dor.apana.org.au>
> Sent: Tuesday, December 9, 2025 8:28 PM
> To: Yosry Ahmed <yosry.ahmed@...ux.dev>
> Cc: Sridhar, Kanchana P <kanchana.p.sridhar@...el.com>; SeongJae Park
> <sj@...nel.org>; linux-kernel@...r.kernel.org; linux-mm@...ck.org;
> hannes@...xchg.org; nphamcs@...il.com; chengming.zhou@...ux.dev;
> usamaarif642@...il.com; ryan.roberts@....com; 21cnbao@...il.com;
> ying.huang@...ux.alibaba.com; akpm@...ux-foundation.org;
> senozhatsky@...omium.org; kasong@...cent.com; linux-
> crypto@...r.kernel.org; davem@...emloft.net; clabbe@...libre.com;
> ardb@...nel.org; ebiggers@...gle.com; surenb@...gle.com; Accardi,
> Kristen C <kristen.c.accardi@...el.com>; Gomes, Vinicius
> <vinicius.gomes@...el.com>; Feghali, Wajdi K <wajdi.k.feghali@...el.com>;
> Gopal, Vinodh <vinodh.gopal@...el.com>
> Subject: Re: [PATCH v13 22/22] mm: zswap: Batched zswap_compress() with
> compress batching of large folios.
> 
> On Tue, Dec 09, 2025 at 05:31:35PM +0000, Yosry Ahmed wrote:
> >
> > Ugh, yes.. I don't think we want to burn 7 extra pages per-CPU for SW
> > compressors.
> 
> OK so the consensus is that we're keeping the visible batch size
> attribute for now, which will be set to 1 for everything but iaa.
> 
> So for now I'm going to just provide a trivial acomp fallback so
> that non-batching algorithms conform to the batching calling
> convention for a batch size of 1.

Thanks Herbert, this sounds good.

Thanks,
Kanchana

> 
> 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