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b=YxGhvUaNTocIkJZunC5vXUOgkTErMFxp4CbFY9jx7JCWxCeQGIz8HJ2OUIUkqOhL7 ZrORxqhDaEfi/u7zp0r8Jp9kQE/5XTZw6dOVmgOgig30Bki736Eqm4VevTIvfmshNT rWzMFyDljK0zd+qeMwbmCx7UFJJVLB3Uc+4Vmy2JGjBm6DeGabx+2QDPdTGIdfUw1z GeSfSbMYsmoORs88eAwr00VM6k1dGtQH0GPTiRcF6Xz546K2rFrS96tWARQzwin49e T2kaf4E+NAKEUVKe3hGLybUcHNEoOE4QRgASXtYf9xUVlUD0HUIbFteFN5m2NI9cA0 Sx26EqYHO3Fog== Message-ID: <5ecb772b-2f2f-4010-aa6e-8894d188ea10@kernel.org> Date: Wed, 18 Mar 2026 20:49:52 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH mm-unstable v15 13/13] Documentation: mm: update the admin guide for mTHP collapse To: Nico Pache , "Lorenzo Stoakes (Oracle)" Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, aarcange@redhat.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, apopple@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, byungchul@sk.com, catalin.marinas@arm.com, cl@gentwo.org, corbet@lwn.net, dave.hansen@linux.intel.com, dev.jain@arm.com, gourry@gourry.net, hannes@cmpxchg.org, hughd@google.com, jack@suse.cz, jackmanb@google.com, jannh@google.com, jglisse@google.com, joshua.hahnjy@gmail.com, kas@kernel.org, lance.yang@linux.dev, Liam.Howlett@oracle.com, lorenzo.stoakes@oracle.com, mathieu.desnoyers@efficios.com, matthew.brost@intel.com, mhiramat@kernel.org, mhocko@suse.com, peterx@redhat.com, pfalcato@suse.de, rakie.kim@sk.com, raquini@redhat.com, rdunlap@infradead.org, richard.weiyang@gmail.com, rientjes@google.com, rostedt@goodmis.org, rppt@kernel.org, ryan.roberts@arm.com, shivankg@amd.com, sunnanyong@huawei.com, surenb@google.com, thomas.hellstrom@linux.intel.com, tiwai@suse.de, usamaarif642@gmail.com, vbabka@suse.cz, vishal.moola@gmail.com, wangkefeng.wang@huawei.com, will@kernel.org, willy@infradead.org, yang@os.amperecomputing.com, ying.huang@linux.alibaba.com, ziy@nvidia.com, zokeefe@google.com, Bagas Sanjaya References: <20260226031741.230674-1-npache@redhat.com> <20260226032706.234519-1-npache@redhat.com> <638caee3-af71-47c7-bdc8-a905d3143387@lucifer.local> <1adffe75-cc91-4c55-bde7-9406bf656c72@redhat.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 0FAB716000C X-Stat-Signature: z1z81mouz8jbraahdfx776bpa91u5jqy X-Rspam-User: X-HE-Tag: 1773863408-90887 X-HE-Meta: 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 KA+ZZwKm lAb18+Wul3kISTw4Q4JYhDJdXzXTgLzVuGEtH Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/18/26 20:08, Nico Pache wrote: > > > On 3/17/26 5:02 AM, Lorenzo Stoakes (Oracle) wrote: >> On Wed, Feb 25, 2026 at 08:27:06PM -0700, Nico Pache wrote: >>> Now that we can collapse to mTHPs lets update the admin guide to >>> reflect these changes and provide proper guidance on how to utilize it. >>> >>> Reviewed-by: Bagas Sanjaya >>> Signed-off-by: Nico Pache >> >> LGTM, but maybe we should mention somewhere about mTHP's max_ptes_none >> behaviour? > > IIRC we decided to strictly leave that out of the manual. I used to have it in > here. @david? I think we argued in the past that we didn't want to document the weird scaling part. Documenting that only two values are currently supported (no scaling) makes sense to me. -- Cheers, David