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Wed, 22 Oct 2025 12:52:26 -0700 (PDT) Date: Wed, 22 Oct 2025 12:52:26 -0700 (PDT) From: "Christoph Lameter (Ampere)" To: Nico Pache cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.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, 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, 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, Bagas Sanjaya Subject: Re: [PATCH v12 mm-new 15/15] Documentation: mm: update the admin guide for mTHP collapse In-Reply-To: <20251022183717.70829-16-npache@redhat.com> Message-ID: References: <20251022183717.70829-1-npache@redhat.com> <20251022183717.70829-16-npache@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Stat-Signature: 5t4aqqjahj64ignubgbq9bw4y7wobkrf X-Rspamd-Queue-Id: 2D82C8001B X-Rspamd-Server: rspam06 X-Rspam-User: X-HE-Tag: 1761162751-358311 X-HE-Meta: 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 n5TZslB9 RA7OABtaeStAhD3UjEtyWi7MX/mqn6QwKUKbv8YwS/ZzuMnLYzGX0ue1Nt+WNV3l+iN58b8XGh78inoRkekrhd8iMj1kXGVkPkTbXxOgM+a2vrdIJFtmjzpqsGYvYdJKdS7M/EPkIG8c8qqK9JWiMqqZgydRm/Q8RUCWVVeTzWAS7+Q6+o8MyE+2YNkwvPx/gzpSsON7gKX6cSIy7Xp7TI9mdzbvDJ1zOPJE7DFUjby1JHm4kBOh2OUeb1gmlF7QizkbGiKINkwCj63luMXUGvwpGzEY3wcxPZXDDTo477nUgXwGcPuhVQRPW7wHnIEVCK3ELoZWU0axqn0h+Ly3eE/VdjUo0546zBhceitK2kd3htZHGJ8b71yA7XQ== 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 Wed, 22 Oct 2025, Nico Pache wrote: > Currently, madvise_collapse only supports collapsing to PMD-sized THPs + > and does not attempt mTHP collapses. + madvise collapse is frequently used as far as I can tell from the THP loads being tested. Could we support madvise collapse for mTHP?