From: Andrew Morton <akpm@linux-foundation.org>
To: Kiryl Shutsemau <kirill@shutemov.name>
Cc: "David Hildenbrand (Arm)" <david@kernel.org>,
"Lorenzo Stoakes (ARM)" <ljs@kernel.org>,
Mike Rapoport <rppt@kernel.org>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
"Kiryl Shutsemau (Meta)" <kas@kernel.org>,
linux-mm@kvack.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org,
Muhammad Usama Anjum <usama.anjum@arm.com>,
Usama Arif <usama.arif@linux.dev>,
"Nico Pache (Red Hat)" <nico.pache@linux.dev>,
Zi Yan <ziy@nvidia.com>, Barry Song <baohua@kernel.org>,
Dev Jain <dev.jain@arm.com>, Hugh Dickins <hughd@google.com>,
Lance Yang <lance.yang@linux.dev>,
"Liam R. Howlett" <liam@infradead.org>,
Michal Hocko <mhocko@suse.com>,
Ryan Roberts <ryan.roberts@arm.com>,
Shuah Khan <shuah@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
"Vlastimil Babka (SUSE)" <vbabka@kernel.org>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Leon Romanovsky <leon@kernel.org>,
kernel-team@meta.com
Subject: Re: [PATCH v6 00/19] selftests/mm: improve khugepaged coverage
Date: Sun, 20 Sep 2026 16:54:24 -0700 [thread overview]
Message-ID: <20260920165424.adbd45ccfc6162ffb0e4b424@linux-foundation.org> (raw)
In-Reply-To: <20260919002451.496763-1-kirill@shutemov.name>
On Sat, 19 Sep 2026 01:24:30 +0100 Kiryl Shutsemau <kirill@shutemov.name> wrote:
> From: "Kiryl Shutsemau (Meta)" <kas@kernel.org>
>
> 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.
prev parent reply other threads:[~2026-09-20 23:54 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-19 0:24 Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 01/19] selftests/mm: raise the khugepaged test-case cap Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 02/19] selftests/mm: skip collapse_compound_extreme() where the PMD is too large Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 03/19] selftests/mm: scale khugepaged's collapse wait with the PMD size Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 04/19] selftests/mm: skip khugepaged page cache cases without a PMD folio Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 05/19] selftests/mm: make the swap cases' swapout reliable Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 06/19] selftests/mm: stop khugepaged during the MADV_COLLAPSE cases Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 07/19] selftests/mm: move is_backed_by_folio() into vm_util Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 08/19] selftests/mm: add folio-order check for address ranges Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 09/19] selftests/mm: add folio-order detection self-check Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 10/19] selftests/mm: add khugepaged completion barrier helper Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 11/19] selftests/mm: add order-parameterized khugepaged collapse cases Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 12/19] selftests/mm: parameterize the mixed-source collapse case by source order Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 13/19] selftests/mm: cover a shared-source collapse write race Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 14/19] selftests/mm: run every supported collapse order by default Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 15/19] selftests/mm: check that one khugepaged pass collapses one window Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 16/19] selftests/mm: add khugepaged race harness Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 17/19] selftests/mm: race the collapse of windows with holes Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 18/19] selftests/mm: add memory-pressure threads to the khugepaged race harness Kiryl Shutsemau
2026-09-19 0:24 ` [PATCH v6 19/19] selftests/mm: zap whole PTE tables in " Kiryl Shutsemau
2026-09-20 23:54 ` Andrew Morton [this message]
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