linux-kernel - Re: [PATCH v5 1/3] crypto: introduce: acomp_is_async to expose if comp drivers might sleep

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Message-ID: <ZdWKz43tTz2XY4ca@gondor.apana.org.au>
Date: Wed, 21 Feb 2024 13:31:59 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Barry Song <21cnbao@...il.com>
Cc: akpm@...ux-foundation.org, davem@...emloft.net, hannes@...xchg.org,
	linux-crypto@...r.kernel.org, linux-mm@...ck.org, nphamcs@...il.com,
	yosryahmed@...gle.com, zhouchengming@...edance.com,
	chriscli@...gle.com, chrisl@...nel.org, ddstreet@...e.org,
	linux-kernel@...r.kernel.org, sjenning@...hat.com,
	vitaly.wool@...sulko.com, Barry Song <v-songbaohua@...o.com>
Subject: Re: [PATCH v5 1/3] crypto: introduce: acomp_is_async to expose if
 comp drivers might sleep

On Tue, Feb 20, 2024 at 07:44:12PM +1300, Barry Song wrote:
> From: Barry Song <v-songbaohua@...o.com>
> 
> acomp's users might want to know if acomp is really async to
> optimize themselves. One typical user which can benefit from
> exposed async stat is zswap.
> 
> In zswap, zsmalloc is the most commonly used allocator for
> (and perhaps the only one). For zsmalloc, we cannot sleep
> while we map the compressed memory, so we copy it to a
> temporary buffer. By knowing the alg won't sleep can help
> zswap to avoid the need for a buffer. This shows noticeable
> improvement in load/store latency of zswap.
> 
> Signed-off-by: Barry Song <v-songbaohua@...o.com>
> ---
>  include/crypto/acompress.h | 6 ++++++
>  1 file changed, 6 insertions(+)

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks,
-- 
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