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[2003:cb:c73b:fa00:8909:2d07:8909:6a5a]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a073cbec5csm14072342f8f.43.2025.04.29.10.15.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 29 Apr 2025 10:15:15 -0700 (PDT) Message-ID: <90677959-9ab2-438b-96b3-4024ea1a5c65@redhat.com> Date: Tue, 29 Apr 2025 19:15:13 +0200 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 12/12] Documentation: mm: update the admin guide for mTHP collapse To: "Christoph Lameter (Ampere)" , Nico Pache Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, akpm@linux-foundation.org, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, ryan.roberts@arm.com, willy@infradead.org, peterx@redhat.com, ziy@nvidia.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kirill.shutemov@linux.intel.com, aarcange@redhat.com, raquini@redhat.com, dev.jain@arm.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com References: <20250428181218.85925-1-npache@redhat.com> <20250428181218.85925-13-npache@redhat.com> <6fd003dc-2a2d-ca15-e7b6-9af988fdbc3f@gentwo.org> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 29.04.25 18:38, Christoph Lameter (Ampere) wrote: > On Mon, 28 Apr 2025, Nico Pache wrote: > >> THP can be enabled system wide or restricted to certain tasks or even >> memory ranges inside task's address space. Unless THP is completely >> disabled, there is ``khugepaged`` daemon that scans memory and >> -collapses sequences of basic pages into PMD-sized huge pages. >> +collapses sequences of basic pages into huge pages. > > huge pages usually have a fixed size like 2M and are tied to the page > table levels. > > Would it not be advisable to use a different term here like "large folio" > or "mTHP sized folio" or something like that? "Traditional THPs or mTHPs (both, currently represented as "large folios" in the kernel). -- Cheers, David / dhildenb