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[192.41.125.253]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-bfcb53ca055sm36691266b.38.2026.06.11.02.23.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 11 Jun 2026 02:23:14 -0700 (PDT) Date: Thu, 11 Jun 2026 10:23:13 +0100 From: Karim Manaouil To: Lorenzo Stoakes Cc: Nico Pache , Luka Bai , David Hildenbrand , David Rientjes , linux-mm@kvack.org, Andrew Morton , Zi Yan , Baolin Wang , "Liam R. Howlett" , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kairui Song , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Rik van Riel , Harry Yoo , Jann Horn , Johannes Weiner , linux-kernel@vger.kernel.org, Luka Bai Subject: Re: [PATCH 0/5] mm/khugepaged: add collapse hint machanism for khugepaged and use in mglru Message-ID: <20260611092313.7d4knb2irt2rtswu@wrangler> References: <20260531-thp_collapse_hint-v1-0-866339cd4c2a@tencent.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 8568E4000C X-Stat-Signature: xug3mrh1xp4o4jo8w5c6fxk6yerd4j7i X-HE-Tag: 1781169797-399768 X-HE-Meta: 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 U4zoI4PT 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jun 09, 2026 at 03:44:21PM +0100, Lorenzo Stoakes wrote: > On Tue, Jun 09, 2026 at 04:17:45AM -0600, Nico Pache wrote: > > I had future plans for something similar as part of the thp=auto work; > > however that requires significant thought and investigation into how > > we can properly gather hints for collapse/split THP candidates. From > > my perspective we'd want a more global structure/system outside of > > khugepaged, that would directly call khugepaged (and others like > > split, etc). It would also tie into the allocator so that at fault > > time it could leverage the hints to make better decisions. My fear > > with this series is that making a decision now might complicate future > > work by adding complexity we may eventually want to remove for a > > better solution. > > I know this is future planning stuff, but I want to point out that we need > to see significant rework of the THP code base before accepting any further > major changes. > > > > > If you have the chance perhaps you can lead a discussion on your > > proposal at the biweekly MM alignment session. > > > > +David Rientjes as he leads those discussions. We could use that time > > to layout a plan for what needs to be done for this work, and for the > > work surrounding thp=auto as I beleive they will be interdependent :) > > We prefer to discuss THP topics in the THP cabal meeting, which both THP > maintainers regularly attend :) having separate sessions we might not be aware > of isn't really helpful. Hi Lorenzo, How to participate in the THP cabal meetings? Is there any public link to join? I'm working recently on anti-fragmentation, which is kind of relevant... Thanks > And 'THP auto' is a broad topic rather than a new feature. I don't think it > should be seen as a topic 'owned' by anybody, but rather something that we > as a community should discuss. > > Series that appear from nowhere trying to implement significant changes > along those lines without community disucssion will not be hugely > appreciated :) > > Thanks, Lorenzo -- ~karim