linux-kernel - Re: [PATCH 00/15] add zpdesc memory descriptor for zswap.zpool

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Date: Tue, 25 Jun 2024 21:44:16 +0800
From: Alex Shi <seakeel@...il.com>
To: Yosry Ahmed <yosryahmed@...gle.com>
Cc: alexs@...nel.org, Vitaly Wool <vitaly.wool@...sulko.com>,
 Miaohe Lin <linmiaohe@...wei.com>, Andrew Morton
 <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, minchan@...nel.org, willy@...radead.org,
 senozhatsky@...omium.org, david@...hat.com, 42.hyeyoo@...il.com
Subject: Re: [PATCH 00/15] add zpdesc memory descriptor for zswap.zpool



On 6/25/24 6:30 PM, Yosry Ahmed wrote:
> On Tue, Jun 25, 2024 at 1:11 AM Alex Shi <seakeel@...il.com> wrote:
>>
>>
>>
>> On 6/25/24 5:46 AM, Yosry Ahmed wrote:
>>> On Thu, Jun 20, 2024 at 10:42 PM <alexs@...nel.org> wrote:
>>>>
>>>> From: Alex Shi <alexs@...nel.org>
>>>>
>>>> According to Metthew's plan, the page descriptor will be replace by a 8
>>>> bytes mem_desc on destination purpose.
>>>> https://lore.kernel.org/lkml/YvV1KTyzZ+Jrtj9x@casper.infradead.org/
>>>>
>>>> Here is a implement on z3fold to replace page descriptor by zpdesc,
>>>> which is still overlay on struct page now. but it's a step move forward
>>>> above destination.
>>>>
>>>> To name the struct zpdesc instead of z3fold_desc, since there are 3 zpool
>>>> usages under zswap, zbud, z3fold, zsmalloc. It looks like we may extend the
>>>> zpdesc to zbud and zsmalloc, combined their usage into one.
>>>
>>> Please do not focus your development efforts on z3fold. We really want
>>> to deprecate/remove it, as well as zbud eventually. See [1].
>>>
>>> For zsmalloc, there is already an ongoing effort to split zsdesc from
>>> struct page [2].
>>>
>>> [1]https://lore.kernel.org/lkml/CAJD7tkbRF6od-2x_L8-A1QL3=2Ww13sCj4S3i4bNndqF+3+_Vg@mail.gmail.com/
>>
>> Hi Yosry,
>>
>> Thanks a lot for the info and comments! It's my stupid w/o checking the email list before work on it.
>> Anyway don't know if z3fold would be removed, jut left this tested patchset here if someone need it.
> 
> It's partially our fault for leaving z3fold knowing that it is headed
> toward deprecation/removal. FWIW, I tried to remove it or mark it as
> deprecated, but there was some resistance :/

Yes, It happens. Community is too huge. Always someone want sth.