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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 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 Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2EACBA0006 X-Stat-Signature: fdy6787ojgdbumuiqrd366qmzyu34i9x X-Rspam-User: X-HE-Tag: 1745946919-17788 X-HE-Meta: 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 1pKq6Lvy 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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 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