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Mon, 7 Sep 2026 09:40:53 -0400 (EDT) Date: Mon, 7 Sep 2026 14:40:51 +0100 From: Kiryl Shutsemau To: Mike Rapoport Cc: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, nico.pache@linux.dev, baolin.wang@linux.alibaba.com, baohua@kernel.org, dev.jain@arm.com, hughd@google.com, lance.yang@linux.dev, liam@infradead.org, mhocko@suse.com, ryan.roberts@arm.com, shuah@kernel.org, surenb@google.com, usama.arif@linux.dev, vbabka@kernel.org, ziy@nvidia.com, usama.anjum@arm.com, agordeev@linux.ibm.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 12/19] selftests/mm: parameterize the mixed-source collapse case by source order Message-ID: References: <20260815015901.1236937-1-kirill@shutemov.name> <20260815015901.1236937-13-kirill@shutemov.name> <178721523517.2799959.8628888160176030191.b4-review@b4> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <178721523517.2799959.8628888160176030191.b4-review@b4> X-Rspamd-Server: rspam11 X-Rspam-User: X-Stat-Signature: 7dqdsc1u7c9db6bufnnr6pihs81xineg X-Rspamd-Queue-Id: 8E78A180014 X-HE-Tag: 1788788455-819102 X-HE-Meta: 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 4VreywUX +ekeJKLK85l2gjE76du/imEGzPAm23m9hqfdnYmawSRTc1JgDuXPzqLTl4E5ybYNuKJhk15dXajrSDG7aLIXZm/kR2dgaNZEiQAK5tnsgAdEQmIGiC+00hWTouKc1rtJ0B0EH5xhrna6siaPvRdWb/sIp5lef9+znQ3XcfduU8tcq4u4Laz0dxDrjnlrFtzxSVs1P2b00Xpo2AgzjE9Um2LJ9o7BcN3c1pEHQ2gf12ORKRhMDFuf7V0C2rpEZ+g33ow3qGfNNtxSv/7BL/0VjkfXIGGIIpXd+TLSyKmCGJxzEn5LaQyqIiFPPoF+E9jbiCr6ThWhp7WHHEuvu5eYW4uqG8onzLOHV5cpml7jnpy4uHdSo94Qf6gdjdjRUC5JLvPx57NVFiRwxZzgHQyRKsQmc4g5mODTfFblH9bvhZrM85Ly92RaO7BBcsJe2KOf1RGAK Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Aug 20, 2026 at 11:40:35AM +0300, Mike Rapoport wrote: > > collapse_order_mixed_sources() faults its region as order-2 folios and > > collapses them to the -c target. Order 2 sits below the contpte threshold > > on both arm64 page-size configurations, so nothing in this suite unfolds a > > contpte source on purpose. > > > > Let -s name the source order alongside -c. The case then faults at that > > order, keeping order 2 when -s is absent, and the source order has to be a > > supported mTHP order below the target. The other mTHP cases are > > unaffected: mthp_push_target_order() enables only the target order. > > > > "-s 5 -c 7" on arm64/64K then collapses contpte-mapped sources into a > > larger mTHP. > > I'd fold it into the previous patch. I would rather not mix new test cases with changes to how the test is driven. -- Kiryl Shutsemau / Kirill A. Shutemov