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[2003:d8:2f3f:4b00:ee13:8c22:5cc5:d169]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4772899fdf0sm87665605e9.3.2025.10.31.04.12.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 31 Oct 2025 04:12:40 -0700 (PDT) Message-ID: <1c0c89d3-0f72-4631-b1fc-41e1426c8bed@redhat.com> Date: Fri, 31 Oct 2025 12:12:37 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 mm-new 06/15] khugepaged: introduce collapse_max_ptes_none helper function To: Lorenzo Stoakes Cc: Nico Pache , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org, baohua@kernel.org, willy@infradead.org, peterx@redhat.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kas@kernel.org, aarcange@redhat.com, raquini@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org, hughd@google.com, richard.weiyang@gmail.com, lance.yang@linux.dev, vbabka@suse.cz, rppt@kernel.org, jannh@google.com, pfalcato@suse.de References: <20251022183717.70829-1-npache@redhat.com> <20251022183717.70829-7-npache@redhat.com> <5f8c69c1-d07b-4957-b671-b37fccf729f1@lucifer.local> <74583699-bd9e-496c-904c-ce6a8e1b42d9@redhat.com> <3dc6b17f-a3e0-4b2c-9348-c75257b0e7f6@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 66B0640009 X-Stat-Signature: wsfof944te6ypsfqoahgfft4xadqcq8q X-Rspam-User: X-HE-Tag: 1761909166-962228 X-HE-Meta: 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 Y3VDANUn 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >>>> "eagerness" would not be like swappiness, and we will really have to be >>>> careful here. I don't know yet when I will have time to look into that. >>> >>> I guess I missed this part of the converastion, what do you mean? >> >> Johannes raised issues with that on the list and afterwards we had an >> offline discussion about some of the details and why something unpredictable >> is not good. > > Could we get these details on-list so we can discuss them? This doesn't have to > be urgent, but I would like to have a say in this or at least be part of the > converastion please. Sorry, I only found now time to reply on this point. Johannes raised the point in [1], and afterwards we went a bit into detail in a off-list discussion. In essence, I think he is right that is something we have to be very careful about. So it turned out as something that will take a lot more time+effort on my side than I originally thought, turning it not feasible in the short term given how I already lack behind on so many other things. So I concluded that it's probably best to have such and effort be independent of this series. And in some way it is either way, because max_ptes_none is just a horrible interface given the values are architecture dependent. I'll be happy if we can focus in this series on the bare minimum initial support, and avoid any magic (scaling / capping) as it all turned out to be much more tricky (interaction with the deferred shrinker ...) than most of us initially thought. But I think we're already on the same page here, just wanted to share a bit more details on the max_ptes_none vs. eagerness idea. [1] https://lkml.kernel.org/r/20250915134359.GA827803@cmpxchg.org -- Cheers David / dhildenb