From: Herbert Xu <herbert@gondor.apana.org.au>
To: Barry Song <21cnbao@gmail.com>
Cc: Chengming Zhou <zhouchengming@bytedance.com>,
Andrew Morton <akpm@linux-foundation.org>,
Seth Jennings <sjenning@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Vitaly Wool <vitaly.wool@konsulko.com>,
Nhat Pham <nphamcs@gmail.com>, Chris Li <chriscli@google.com>,
Yosry Ahmed <yosryahmed@google.com>,
Dan Streetman <ddstreet@ieee.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Chris Li <chrisl@kernel.org>
Subject: Re: [PATCH v4 2/6] mm/zswap: reuse dstmem when decompress
Date: Thu, 28 Dec 2023 17:49:16 +0800 [thread overview]
Message-ID: <ZY1EnEefZsRTGYnP@gondor.apana.org.au> (raw)
In-Reply-To: <CAGsJ_4xHJzfjCsWqOdEs_=DTExJueO3gsVg4y_sNtr3U8BEuRg@mail.gmail.com>
On Thu, Dec 28, 2023 at 09:03:32PM +1300, Barry Song wrote:
>
> for CPU-based alg, we have completed the compr/decompr within
> crypto_acomp_decompress()
> synchronously. they won't return EINPROGRESS, EBUSY.
>
> The problem is that crypto_acomp won't expose this information to its
> users. if it does,
> we can use this info, we will totally avoid the code of copying
> zsmalloc's data to a tmp
> buffer for the most majority users of zswap.
>
> But I am not sure if we can find a way to convince Herbert(+To) :-)
What would you like to expose? The async status of the underlying
algorithm?
We could certainly do that. But I wonder if it might actually be
better for you to allocate a second sync-only algorithm for such
cases. I'd like to see some real numbers.
Cheers,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
next prev parent reply other threads:[~2023-12-28 9:49 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-26 15:54 [PATCH v4 0/6] mm/zswap: dstmem reuse optimizations and cleanups Chengming Zhou
2023-12-26 15:54 ` [PATCH v4 1/6] mm/zswap: change dstmem size to one page Chengming Zhou
2023-12-27 1:07 ` Barry Song
2023-12-27 6:11 ` Chengming Zhou
2023-12-27 6:32 ` Barry Song
2023-12-27 20:58 ` Andrew Morton
2023-12-27 23:21 ` Nhat Pham
2023-12-28 6:41 ` Chengming Zhou
2023-12-26 15:54 ` [PATCH v4 2/6] mm/zswap: reuse dstmem when decompress Chengming Zhou
2023-12-27 1:24 ` Barry Song
2023-12-27 6:32 ` Chengming Zhou
2023-12-28 8:03 ` Barry Song
2023-12-28 8:23 ` Chengming Zhou
2023-12-28 9:49 ` Herbert Xu [this message]
2024-01-03 2:57 ` [PATCH RFC 1/2] crypto: introduce acomp_is_async to expose if a acomp has a scomp backend Barry Song
2024-01-03 2:57 ` [PATCH RFC 2/2] mm/zswap: remove the memcpy if acomp is not asynchronous Barry Song
2024-01-03 2:57 ` [PATCH v4 2/6] mm/zswap: reuse dstmem when decompress Barry Song
2024-01-25 9:41 ` Herbert Xu
2024-01-27 14:41 ` Barry Song
2023-12-26 15:54 ` [PATCH v4 3/6] mm/zswap: refactor out __zswap_load() Chengming Zhou
2023-12-26 15:54 ` [PATCH v4 4/6] mm/zswap: cleanup zswap_load() Chengming Zhou
2023-12-26 15:54 ` [PATCH v4 5/6] mm/zswap: cleanup zswap_writeback_entry() Chengming Zhou
2023-12-26 15:54 ` [PATCH v4 6/6] mm/zswap: change per-cpu mutex and buffer to per-acomp_ctx Chengming Zhou
2023-12-26 19:08 ` Nhat Pham
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