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[2003:d8:2f18:f900:e0ae:65d5:8bf8:8cfd]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45e0156b0a8sm175910915e9.3.2025.09.15.03.52.54 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 15 Sep 2025 03:52:55 -0700 (PDT) Message-ID: Date: Mon, 15 Sep 2025 12:52:53 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 00/15] khugepaged: mTHP support To: Lorenzo Stoakes Cc: Kiryl Shutsemau , Nico Pache , linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@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, 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: <20250912032810.197475-1-npache@redhat.com> <2c5328ee-fb6e-45cf-a151-868cc8e7ff97@lucifer.local> <4508810d-7645-4f57-a0c5-2ee9f44206fc@lucifer.local> <34754ca4-fced-4a3c-8ff8-c00967d487de@redhat.com> <92352257-5be4-4aaa-b97f-c4e879ac6959@lucifer.local> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: dsfdso5m8k75hpg9rrtzzgoihz4au9cc X-Rspam-User: X-Rspamd-Queue-Id: F0F47C000A X-Rspamd-Server: rspam10 X-HE-Tag: 1757933579-218664 X-HE-Meta: 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 0FiYjj7e 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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: On 15.09.25 12:48, Lorenzo Stoakes wrote: > On Mon, Sep 15, 2025 at 12:44:34PM +0200, David Hildenbrand wrote: >>>>> Mapping that to actual THP sizes (#pages in a thp) on an arch will be easy. >>>> >>>> And at different mTHP levels too right? >>>> >>> >>> Another point here, since we have to keep: >>> >>> /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none >>> >>> Around, and users will try to set values there, presumably we will now add: >>> >>> /sys/kernel/mm/transparent_hugepage/khugepaged/eagerness >>> >>> How will we map <-> the two tunables? >> >> Well, the easy case if someone updates eagerness, then we simply et it to >> whatever magic value we compute and document. >> >> The other direction is more problematic, likely we'll simply warn and do >> something reasonable (map it to whatever eagerness scale is closest or >> simply indicate it as "-1" -- user intervened or sth like that) > > I don't love the idea of a -1 situation, as that's going to create some > confusion. swapiness also has a "max" parameter, so we could just say "override" /" disabled" / whatever? -- Cheers David / dhildenb