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Date:   Mon, 28 Mar 2022 15:47:29 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Yu Zhao <yuzhao@...gle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Barry Song <baohua@...nel.org>,
        Brian Geffon <bgeffon@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Daniel Byrne <djbyrne@....edu>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Donald Carr <d@...os-reins.com>,
        Hillf Danton <hdanton@...a.com>,
        Holger Hoffstätte <holger@...lied-asynchrony.com>,
        Jan Alexander Steffens <heftig@...hlinux.org>,
        Jens Axboe <axboe@...nel.dk>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Konstantin Kharlamov <Hi-Angel@...dex.ru>,
        Mel Gorman <mgorman@...e.de>,
        Michael Larabel <Michael@...haellarabel.com>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...nel.org>,
        Oleksandr Natalenko <oleksandr@...alenko.name>,
        Rik van Riel <riel@...riel.com>,
        Shuang Zhai <szhai2@...rochester.edu>,
        Sofia Trinh <sofia.trinh@....works>,
        Steven Barrett <steven@...uorix.net>,
        Suleiman Souhlal <suleiman@...gle.com>,
        Vaibhav Jain <vaibhav@...ux.ibm.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Will Deacon <will@...nel.org>,
        Ying Huang <ying.huang@...el.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Kernel Page Reclaim v2 <page-reclaim@...gle.com>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [page-reclaim] Re: [GIT PULL] Multi-gen LRU for 5.18-rc1

On 28.03.22 15:43, Matthew Wilcox wrote:
> On Mon, Mar 28, 2022 at 02:29:20PM +0200, David Hildenbrand wrote:
>> I'd appreciate if we could merge most MM-related stuff through the -MM
>> tree; it exists for a reason IMHO. Andrew, you usually have a very good
>> feeling when something's ready to be merged upstream (sufficient review
>> from relevant folks, sufficient exposure via -mm and -next, ...).
> 
> The problem is that the MM tree is completely unusable when patches going
> in through other trees need to be based on it.  The MM workflow clearly
> works well for Andrew, but it doesn't work well for us as a community.
> 
> Fortunately folios is past that point now, but I fear that maple tree
> will get to that point if it doesn't go in through Andrew's tree this
> cycle, as it may have other users.

Yes, there are most certainly special cases, like folios and eventually
like the maple tree rework. But I consider these exceptions to the
general rule. And the exceptions should follow the same ACKing/review
process as other -MM stuff, as Linus nicely identified here.

-- 
Thanks,

David / dhildenb

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