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b=YjD8qWvlk/+0QU52fW24gxJKnVOPSh0k2RXfhE48vNcIA9k++3mfDd64kSZho3Ey4 Um2JUR/Fbh6sLYZfpAI9ZoQ4aSGeN70ARBhB1/lmAEm+v0qANoXrtrWtMqiflrzbq8 vaPknQr5KMEkE9ZXQipUs5zJTRF0tSEoWRnAbPh2RYPpTy/AGEr1H4qAEeSYygZ/XP yMn2buf+ZEaztue+Aqx1ZA8DllKtJMcnlj7Gcb7XO5AH0C2BkGNFjgVb81nGXq63uU +HIawJK7SRk+DzXdwDYPT42SqeEeRFU3Zp9x2M8D0bc9uz0+Lh7DT7h5efHuV3kNbK ZrOGLEkXJe2Kg== Message-ID: <589d3c4b-77af-40a3-8506-5b00a5194aff@kernel.org> Date: Tue, 2 Jun 2026 15:08:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Process (was Re: [PATCH mm-hotfixes-unstable v18 00/14] khugepaged: add mTHP) collapse support Content-Language: en-US To: "David Hildenbrand (Arm)" , Lorenzo Stoakes Cc: Nico Pache , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, liam@infradead.org, mhocko@suse.com, rppt@kernel.org, vbabka@suse.cz, willy@infradead.org References: <20260522150009.121603-1-npache@redhat.com> <506fed6b-8954-40fa-8b5e-c8bd8c0d004b@kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 327F3140003 X-Stat-Signature: mb4tutosmihc3g41qan7jp36b4759o1u X-Rspam-User: X-HE-Tag: 1780405685-684545 X-HE-Meta: U2FsdGVkX18Ji5pYtWdrPwyGh2NtgEr3F7H0ogzjuHYxMe8oidCMyrAnaP4x7G4UiMbFnn0aBc4pzpwzEHTuKvvzku9i6zqfTSuppAQKAKgNs1UX8HkgXvYBWn9vM0WXnWouIJE7TnQw8EB39CLJK6ycI250KzQfbGA4aEBPdewtdIkwZfi/YX4zCggQxB9h+JHag1Oev1bAjIfqktIKL7zo+qYfqe56bdFalre8UBo7Gj9v6Uze7VOHbTJGuNQG20KtpZq2ZsX1HrvFWbZy88M8a7Uamfl1gEdDDIoDqZdmXor4UvPIMHiKIOUpuejruwOsgJNbU41H/qcQb8cO2cQiK7etDRPmqUIIWci744sJmYqvFtTkLeRy3PlR4euBM7LZ/3LLtTITn9t/N/OeoMTAC9CeDCdh5J4NAPRiVbw31hEFy/Luw+YM5XiKSvaLi8zJKZHTrrpQlh0NyPRMet2obuBG5wwDz4czkKznbxo6pUoDBbow+NmbgxH7HE+X5ZN4D1QcVUzY8Q7+Ks7dbA5l1m8+AALBytUEkBfzgVKkwXMW2LF9h0MPxG5tJxJCmnTGl89VnWFq7YyKZaOOl+OQyyirEnOP2EKXyUEFfcgVjHYfO4po/RBXuCcE7voZCSMWlp5FJKI7IO4SFq9bQsM4/EYTfs5ENgi742DlcqxltJd1uD74AnBf032v6lFxteLaZnYNsQ7BqCDHp74z0UKqvWp628nwYn8BPcT56p94bNMcTsYdlpd0ZQe1VJhIyiKDquWZBGEkvSVuwcgFb/Mhp7waMNC+DixZk1qNsctHv6r4lit1Hpzy5rxQ3dhdRyACRIUMfGEBCjEMyzsF7VUGxUNXPDS5pUSAZlHENHgGJ727nkFtxyJD5Bj/09gkUGqCGO1gi5Uw1imklNjHTHYUvoOw724lkXKlq5+rub3oTvoEA11c/5UG03wpNrU0CijF0P0LmLKBiqlniPp ApojgtdA hUqg6BRTBUduzAkmaRKkhC8zige4Hfifg9aTN0gDaiUwpNzjc50rz0Gb55leybRz6UIPOFScPDyGlQNhhxLLSp4+vl2I+YXcDe0KHaZYaZdMTBw807X0TcdfyRSL4PFpby9zGqAGf8vcEWbYg4uxa2lnA4IuHQCeEOGYWhbuym247JbKclWQAQkpVESop0BhbtqbtF2o71vYR1wS5kVoObbzzTVyGsITBStROLexqNabK2Os644MFAj0CoYDxhKUa1bNX Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/2/26 14:58, David Hildenbrand (Arm) wrote: > On 6/2/26 14:47, Vlastimil Babka (SUSE) wrote: >> On 6/2/26 13:20, David Hildenbrand (Arm) wrote: >>> On 6/1/26 18:16, Lorenzo Stoakes wrote: >>>> >>>> Err what? The 'random' tree is the MAINTAINERS entry you are targeting, it's >>>> based on the mm-next stable branch and only diverges in the work that's been >>>> done specific to the subtree, what's crazy exactly? >>> >>> We'll still have plenty of patch sets that touch files cross trees. >>> >>> I don't see the problem of sending stuff against the integration tree from where >>> it can just be cleanly picked up by sub-maintainers (after all, that's where all >>> the subtrees were integrated against)? Or what exactly is the problem with that? >> >> The problem is that the patches would not be applied on top of the >> integration tree, so it doesn't make sense to base them on it in the first >> place. Unless they target the next cycle, where the integration tree would >> first become part of rc1, which would be the new base for all the >> submaintainer trees. > Why does that matter? Well, as longs as there are no conflicts, it probably doesn't. > For example, the slab-next tree gets merged into the mm-next tree. Submitter > will send against mm-next. > > The slab maintainer will cherry-pick the patches on top of slab-next. From where > they end up in mm-next. Note slab-next itself might be a collection of topic branches and it might be more flexible to create another topic branch (based on rc1) and merge it, than apply stuff on top of a product of merging. (I think extreme case if vfs where almost everything is topic branch and even the PRs to Linus are many separate branches?) > In the rare event of conflicts, the base-commit ID is there and known. If it's > too much of a mess, we could ask to resend against the slab-next tree. Alright, I guess some conflicts might be harder to resolve when based on mm-next and then tried to rebase on slab-next only. And others harder to resolve when based on rc1 and then integrated to slab-next. > Again, TIP allows that. For example, I never based any x86/mm patch on x86/mm > and ... was fine? :) >