Message-ID: <20220407183112.2cb5b627@canb.auug.org.au>
Date:   Thu, 7 Apr 2022 18:31:12 +1000
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Yu Zhao <yuzhao@...gle.com>
Cc:     Linux-MM <linux-mm@...ck.org>, Andi Kleen <ak@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Barry Song <21cnbao@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Hillf Danton <hdanton@...a.com>, Jens Axboe <axboe@...nel.dk>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Michael Larabel <Michael@...haellarabel.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
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        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
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Subject: Re: [PATCH v10 00/14] Multi-Gen LRU Framework

Hi Yu,

On Wed, 6 Apr 2022 21:24:27 -0600 Yu Zhao <yuzhao@...gle.com> wrote:
>
> Can you please include this patchset in linux-next? Git repo for you to fetch:
> 
> https://linux-mm.googlesource.com/mglru for-linux-next

I get a message saying "This repository is empty. Push to it to show
branches and history." :-(

> My goal is to get additional test coverage before I send a pull
> request for 5.19 to Linus.

Good idea :-)

> I've explored all avenues, but ultimately I've failed to rally
> substantial support from the MM stakeholders [1]. There are no pending
> technical issues against this patchset [2]. What is more concerning
> are the fundamental disagreements on priorities, methodologies, etc.
> that are not specific to this patchset and have been hindering our
> progress as a collective. (Cheers to the mutual dissatisfaction.)

I have not been following the discussion as I am not an mm person, but
this is not a good sign.

> While we plan to discuss those issues during the LSFMM next month, it
> doesn't seem reasonable to leave this patchset hanging in the air,
> since it has reached its maturity a while ago and there are strong
> demands from downstream kernels as well as a large user base. Thus I
> sent that pull request to Linus a couple of weeks ago, implying that
> he would have to make the final decision soon.
> 
> I hope this gives enough background about what's been going on with
> this patchset. If you decide to take it and it causes you any
> troubles, please feel free to yell at me.
> 
> Thanks!
> 
> [1] https://lore.kernel.org/r/20220104202227.2903605-1-yuzhao@google.com/
> [2] https://lore.kernel.org/r/20220326010003.3155137-1-yuzhao@google.com/

I had a look at those threads and I guess things are better that your
comment above implies.

So, a couple of questions:

Have you done a trial merge with a current linux-next tree to see what
sort of mess/pain we may already be in?

Is it all stable enough now that it could be sent as a patch series for
Andrew to include in mmotm (with perhaps just smallish followup patches)?

-- 
Cheers,
Stephen Rothwell

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