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b=JCnIX7pGgvk9cNWaMNZY3FOn+byzKD3xZYjCqrE/ydXMNjBtitB1WdqVWc+YdUdax 5HxL0Gf09cPK7vx/GnHTS9XAGIkZ3cBEA9Qr5OfLGRYskxvueM+Ndo3YQ78j90b6hO ejyg8yqXbqWXqRn7uqX+PZjqQoZsoTqmXjQ2Q/34= Date: Tue, 8 Sep 2026 12:41:02 -0700 From: Andrew Morton To: Kiryl Shutsemau Cc: david@kernel.org, ljs@kernel.org, rppt@kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, usama.anjum@arm.com, usama.arif@linux.dev, baolin.wang@linux.alibaba.com, nico.pache@linux.dev, ziy@nvidia.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, vbabka@kernel.org, agordeev@linux.ibm.com, jgg@ziepe.ca, leon@kernel.org, kernel-team@meta.com, "Kiryl Shutsemau (Meta)" Subject: Re: [PATCH v5 00/19] selftests/mm: improve khugepaged coverage Message-Id: <20260908124102.4c874a8a63e50a1cc90e4bfc@linux-foundation.org> In-Reply-To: <20260908125105.1510704-1-kirill@shutemov.name> References: <20260908125105.1510704-1-kirill@shutemov.name> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: ygf9os6rmqs5yh3awuk9bn7mbbu8qm87 X-Rspam-User: X-Rspamd-Queue-Id: E557440008 X-Rspamd-Server: rspam03 X-HE-Tag: 1788896464-208130 X-HE-Meta: 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 skYtaaL+ UFuSkymAFZRHq7+cRutcemVlqXqOGXXK/q7HB/DqSrnw513Nt6+bnUdPLBDFX72UJ8SviflE73rJ1VsJNJkF5p8U6mIArezLG++WrtQ2bk2YHh5NuqXkj2XH3CIY1/YgnwRBmj+CgkSTsQpTCHO+Mhva3ME/PLwMiQGhyaB96yYkqjfhQqILE8cSOrMGwe0m7ixfP+IMkUC8BbYdemi8SoUUeFgzTkXCMXyB2gKMekAiP0YcLsnJLKNwndhwVxRaStvXZR+V9KvnkjBN+LcmQqMsATgavl38K3vTYg1gWALAkhtKURKcoyIZcIA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 8 Sep 2026 13:50:46 +0100 Kiryl Shutsemau wrote: > khugepaged collapses to mTHP orders since 7.2, and 7.3 added three > selftest cases for it: the generic collapse cases run at one order named > by -c, with the result detected by counting folios of that order. > > That leaves the collapse path largely untested. The suite does not run > where a PMD is 512M. A folio count cannot say where a collapse landed. > Fixed sleeps cannot tell "not collapsed" from "not scanned yet". And > nothing exercises collapse under contention. > > Close those gaps in order: Added to mm-new, thanks. Sashiko asked a few things: https://sashiko.dev/#/patchset/20260908125105.1510704-1-kirill@shutemov.name