linux-kernel - Re: [PATCH v2 04/10] crypto/compress: add asynchronous compression support

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Date:	Wed, 27 Jan 2016 16:26:16 +0800
From:	"Li, Weigang" <weigang.li@...el.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Joonsoo Kim <js1304@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Dan Streetman <ddstreet@...e.org>,
	<linux-crypto@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 04/10] crypto/compress: add asynchronous compression
 support

On 1/27/2016 4:09 PM, Herbert Xu wrote:
> On Wed, Jan 27, 2016 at 04:03:55PM +0800, Herbert Xu wrote:
>> On Wed, Jan 27, 2016 at 03:59:05PM +0800, Li, Weigang wrote:
>>>
>>> The acomp is also SG-based, while scomp only accepts flat buffer.
>>
>> Right, but do we need a pointer-based scomp at all? IPComp would
>> certainly be better off with an SG-based interface.  Any other
>> users of compression are presumably dealing with large amounts
>> of data where an SG interface would make more sense.
>>
>> A pointer interface makes sense for shash because you may be hashing
>> 16 bytes at a time.  Nobody sane is going to be compressing 16 bytes,
>> or are they?
>
> Note that I'm fine with keeping an scomp interface underneath
> for those algorithms where the best way to handle SG input is
> to linearise things.  But I would prefer that this interface is
> not exposed to kernel users unless it is absolutely required.
>
> Cheers,
>
Thanks for your comments, Herbert. I Agree, SG-list based compression 
API makes more sense. Maybe Joonsoo can comment on this.