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[2003:cb:c704:2200:50d1:ff5c:5927:203a]) by smtp.gmail.com with ESMTPSA id c4-20020a056000184400b0020584c40778sm13128032wri.103.2022.03.28.06.47.30 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 28 Mar 2022 06:47:31 -0700 (PDT) Message-ID: Date: Mon, 28 Mar 2022 15:47:29 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.2 Subject: Re: [page-reclaim] Re: [GIT PULL] Multi-gen LRU for 5.18-rc1 Content-Language: en-US To: Matthew Wilcox Cc: Andrew Morton , Yu Zhao , Linus Torvalds , Andi Kleen , Aneesh Kumar , Barry Song , Brian Geffon , Catalin Marinas , Daniel Byrne , Dave Hansen , Donald Carr , Hillf Danton , =?UTF-8?Q?Holger_Hoffst=c3=a4tte?= , Jan Alexander Steffens , Jens Axboe , Jesse Barnes , Johannes Weiner , Jonathan Corbet , Konstantin Kharlamov , Mel Gorman , Michael Larabel , Michal Hocko , Mike Rapoport , Oleksandr Natalenko , Rik van Riel , Shuang Zhai , Sofia Trinh , Steven Barrett , Suleiman Souhlal , Vaibhav Jain , Vlastimil Babka , Will Deacon , Ying Huang , Linux ARM , "open list:DOCUMENTATION" , Linux Kernel Mailing List , Linux-MM , Kernel Page Reclaim v2 , the arch/x86 maintainers References: <20220326010003.3155137-1-yuzhao@google.com> <20220326134928.ad739eeecd5d0855dbdc6257@linux-foundation.org> <400edaab-7c6c-f4d1-9a94-e8d0803857fa@redhat.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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