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Howlett" , Michal Hocko , Ryan Roberts , Shuah Khan , Suren Baghdasaryan , "Vlastimil Babka (SUSE)" , Alexander Gordeev , Jason Gunthorpe , Leon Romanovsky , kernel-team@meta.com Subject: Re: [PATCH v6 00/19] selftests/mm: improve khugepaged coverage Message-Id: <20260920165424.adbd45ccfc6162ffb0e4b424@linux-foundation.org> In-Reply-To: <20260919002451.496763-1-kirill@shutemov.name> References: <20260919002451.496763-1-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-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 74DC7140004 X-Stat-Signature: 1bzs761xsnj15aau4nhbyqmp5u6m3kk8 X-Rspam-User: X-HE-Tag: 1789948467-229068 X-HE-Meta: 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 CScRfLa4 MAhgwJyzEMD2HO0XaoxBa9SKiQnLajFx7+1hzOqs165tP6Gnl8dl4ttHp0yrLwQgFECW5tWOPVNNtHEtToVsz7ujHGbM74faLNNIPFxPTP7xtZ9Mucgu3S0CLl9uG9230AdADa44KXsSc1dSmZkv7o/mULtka3TuIaCUQV+xVA/Lip/zGrQo7cr4KmCp9yOBnTDbRJwk1M4fLpKfPYbpVO18UA0DagZ5CJUU2Xs1P/3SAnELqX7wrChihWSVRx66Vj6lLbWK8WXvn1cv/QQeFnXt3UA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, 19 Sep 2026 01:24:30 +0100 Kiryl Shutsemau wrote: > From: "Kiryl Shutsemau (Meta)" > > 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: > Thanks, I've added this to mm-new. I'd previous added v5 but it never really got testing exposure due to a messy interaction with other changes which I didn't get onto fixing.