linux-kernel - Re: [PATCH v3 12/13] mm: Add sysctl vm.compress-batching switch for compress batching during swapout.

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Message-ID: <20241107173412.GE1172372@cmpxchg.org>
Date: Thu, 7 Nov 2024 12:34:12 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Kanchana P Sridhar <kanchana.p.sridhar@...el.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, yosryahmed@...gle.com,
	nphamcs@...il.com, chengming.zhou@...ux.dev, usamaarif642@...il.com,
	ryan.roberts@....com, ying.huang@...el.com, 21cnbao@...il.com,
	akpm@...ux-foundation.org, linux-crypto@...r.kernel.org,
	herbert@...dor.apana.org.au, davem@...emloft.net,
	clabbe@...libre.com, ardb@...nel.org, ebiggers@...gle.com,
	surenb@...gle.com, kristen.c.accardi@...el.com, zanussi@...nel.org,
	wajdi.k.feghali@...el.com, vinodh.gopal@...el.com
Subject: Re: [PATCH v3 12/13] mm: Add sysctl vm.compress-batching switch for
 compress batching during swapout.

On Wed, Nov 06, 2024 at 11:21:04AM -0800, Kanchana P Sridhar wrote:
> The sysctl vm.compress-batching parameter is 0 by default. If the platform
> has Intel IAA, the user can run experiments with IAA compress batching of
> large folios in zswap_store() as follows:
> 
> sysctl vm.compress-batching=1
> echo deflate-iaa > /sys/module/zswap/parameters/compressor

A sysctl seems uncalled for. Can't the batching code be gated on
deflate-iaa being the compressor? It can still be generalized later if
another compressor is shown to benefit from batching.