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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 Subject: Re: [PATCH v12 mm-new 06/15] khugepaged: introduce collapse_max_ptes_none helper function Message-ID: <922e3416-c3b2-4335-8caa-7054b07f1315@lucifer.local> References: <20251022183717.70829-1-npache@redhat.com> <20251022183717.70829-7-npache@redhat.com> <5f8c69c1-d07b-4957-b671-b37fccf729f1@lucifer.local> 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X-Authority-Analysis: v=2.4 cv=Bt2QAIX5 c=1 sm=1 tr=0 ts=6901049a cx=c_pps a=XiAAW1AwiKB2Y8Wsi+sD2Q==:117 a=XiAAW1AwiKB2Y8Wsi+sD2Q==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=x6icFKpwvdMA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=qCYAEQwNp4a2YlImQQoA:9 a=CjuIK1q_8ugA:10 a=UhEZJTgQB8St2RibIkdl:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=QOGEsqRv6VhmHaoFNykA:22 X-Proofpoint-GUID: c9vAEszHYwFJj6Vbz8vJdOwKWbwZQR_M X-Proofpoint-ORIG-GUID: c9vAEszHYwFJj6Vbz8vJdOwKWbwZQR_M X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDI3MDA1NCBTYWx0ZWRfX5eXmIrQerIa9 MMcWOaQj/SHBxgcSKT0hG9QwaWC5m/Sl3LQ3SAO3xJIHm4mS25Y9CtwXK3RhWlMVgtNvIed1PaM 3xadeIbmHZW4XXw9K7ZZhjZ5GakSt35kar1DGKa4bueUigqCxk9An83DQrvC5xzkLT61uzuCY0t gZUbpQcNbUHnvuRE/pSyfKia+yBm0gv/K1NNY6sljZS8SqFzZTYGtNaeZhJdQmb7MNgYIJW9OzF V+NM1UcdCXPV7UOZVLmCKO1u0LgDF3w4+q7KQJ53SIDO8++jzVMf9/8xXTJu4kwIrb7u7p/vOhA 66278Rlp1rYoD6fynX9NKicZVljJxfIJ/wm5F7uqFfZKDvBpfV84g4iMngMMCiOgA0AbWwpiE4L 0r+eoWuty7UzToDShanin5aQIgfZaQ== On Tue, Oct 28, 2025 at 06:49:48PM +0100, David Hildenbrand wrote: > > > Hey Lorenzo, > > > > > > > I mean not to beat a dead horse re: v11 commentary, but I thought we were going > > > > to implement David's idea re: the new 'eagerness' tunable, and again we're now just > > > > implementing the capping at HPAGE_PMD_NR/2 - 1 thing again? > > > > > > I spoke to David and he said to continue forward with this series; the > > > "eagerness" tunable will take some time, and may require further > > > considerations/discussion. > > > > It would be good to communicate this in the patch, I wasn't aware he had said go > > ahead with it. Maybe I missed the mail. > > Just to clarify: yes, I think we should find a way to move forward with this > series without an eagerness toggle. OK, let's please communicate this clearly in future. Maybe I missed the comms on that. > > That doesn't imply that we'll be using the capping as proposed here (I hate > it, it's just tricky to work around it for now). OK well this is what I thought, that you hadn't meant that we should go ahead with the logic completely unaltered from that which was explicitly pushed back on in v10 I think. We obviously need to figure out a way forward on this so let's get that done as quickly as we can. > > And ideally, we can do that without any temporary tunables, because I'm sure > it is a problem we can solve internally long-term. I went into great detail replying on the relevant thread about this, that's have that discussion there for sanity's sake. > > -- > Cheers > > David / dhildenb > Thanks, Lorenzo