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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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rspam12 X-Rspamd-Queue-Id: 6F0091A0010 X-Stat-Signature: agxfgtka4387awi5ugbmdu4ssm167p8a X-Rspam-User: X-HE-Tag: 1761674416-197314 X-HE-Meta: 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 ejoPMy1a 3CLTUwNOLKDfYgRb4yHhn1fXlZnawxhp8pVE6buavVyI2oaL0yV6E9qCjpOmB+w0iLl11Wxu6DBj2XD1ViqcRkCo6zrL88yA2+RJwlNVTledvYzY8vHlNQu6fW4pNOJ4wqIYltiF5lyEpAez4R0nbo85didS+qVYLJXpm 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: 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