linux-kernel - [PATCH v6 0/2] zswap: remove the memcpy if acomp is not sleepable

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Date: Thu, 22 Feb 2024 21:11:33 +1300
From: Barry Song <21cnbao@...il.com>
To: akpm@...ux-foundation.org,
	davem@...emloft.net,
	hannes@...xchg.org,
	herbert@...dor.apana.org.au,
	linux-crypto@...r.kernel.org,
	linux-mm@...ck.org,
	nphamcs@...il.com,
	yosryahmed@...gle.com,
	zhouchengming@...edance.com
Cc: 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: [PATCH v6 0/2] zswap: remove the memcpy if acomp is not sleepable

From: Barry Song <v-songbaohua@...o.com>

In zswap, if we use 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
memcpy.
Thus we introduce an API in crypto to expose if acomp is async,
and zswap can use it to decide if it can remove copying to the
tmp buffer.

-v6:
 * add acked-by of Herbert, Thanks!
 * remove patch 3/3 from the series, as that one will go
   through crypto

Barry Song (2):
  crypto: introduce: acomp_is_async to expose if comp drivers might
    sleep
  mm/zswap: remove the memcpy if acomp is not sleepable

 include/crypto/acompress.h | 6 ++++++
 mm/zswap.c                 | 6 ++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

-- 
2.34.1