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Tue, 8 Sep 2026 17:36:27 -0400 (EDT) Date: Tue, 8 Sep 2026 22:36:26 +0100 From: Kiryl Shutsemau To: Andrew Morton 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 Subject: Re: [PATCH v5 00/19] selftests/mm: improve khugepaged coverage Message-ID: References: <20260908125105.1510704-1-kirill@shutemov.name> <20260908124102.4c874a8a63e50a1cc90e4bfc@linux-foundation.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260908124102.4c874a8a63e50a1cc90e4bfc@linux-foundation.org> On Tue, Sep 08, 2026 at 12:41:02PM -0700, Andrew Morton wrote: > 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. Thanks! > Sashiko asked a few things: > > https://sashiko.dev/#/patchset/20260908125105.1510704-1-kirill@shutemov.name I've replied with fixups to the affected patches. Let me know if you would like a respin or the fixes in any other form. -- Kiryl Shutsemau / Kirill A. Shutemov