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b=UGRPqI68GBAlh9C4rRQOOuXVdq/mzmQAz/kOW0z5WgWrOMrsS3ws5BWD637XsEwVb IwxYeDnfu8B/WLcDl+8qaC0Xh02fxQg4WFWtBXFjmSlz0Lhr8bUbsIECP40NS/YdRD EOv9yD6mYbsWGGM1lRftr46ALQcMecwn5EvLpwPq9IWY9TPXCRyv+cLZoPTjKs8uKG c9bUyKAmT0JlaBuwEYlgnvTFGMiCE+wQtzyYAsHbl99TI1l93lajRjG8o2nYl0y2ac EPcwHiuAU9nk+9TnO8GclwjCWfO5l5ax7BH7Krk4KDQSvOrcnKqKQfjc8PEceGdqBt yceWjUTYotkWA== Message-ID: <5a04238e-7dc7-4c88-b0be-c4b510488f48@kernel.org> Date: Mon, 7 Sep 2026 15:46:30 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Linux MM Alignment Session on hwpoison To: David Rientjes , "Vlastimil Babka (SUSE)" Cc: William Roche , Jiaqi Yan , linmiaohe@huawei.com, ljs@kernel.org, ziy@nvidia.com, osalvador@kernel.org, harry.yoo@oracle.com, willy@infradead.org, osalvador@suse.de, jackmanb@google.com, hannes@cmpxchg.org, nao.horiguchi@gmail.com, tony.luck@intel.com, wangkefeng.wang@huawei.com, jane.chu@oracle.com, akpm@linux-foundation.org, muchun.song@linux.dev, liam@infradead.org, duenwen@google.com, jthoughton@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, rppt@kernel.org, shuah@kernel.org, surenb@google.com, mhocko@suse.com, boudewijn@delta-utec.com References: <20260705180714.3708947-1-jiaqiyan@google.com> <85cb7ea8-8116-4092-8310-69b61eb8602c@kernel.org> <1dea7b3c-7740-474d-b9d4-cd2baf47f181@kernel.org> <168ad406-f6b5-4623-adac-9f894e410e48@kernel.org> <8f787434-5326-4a8f-92d0-467e817a23b4@kernel.org> <8f023b9f-53d0-0eb8-6f75-65957761cf40@google.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 5623D14000E X-Stat-Signature: dk6wreeuw8ggnmc8jz87jq7z56box847 X-Rspam-User: X-HE-Tag: 1788788801-671259 X-HE-Meta: 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 tNZTayLD rdZGz3LuGOiTQ0WTOZw+gS7o5K9C3aWJEXy4MFeMAV080FVCD7Vht3/I9LcBkaD/qs9STHNSXR83TnephWdfiQJJHiWY9ubrBdom283Jrh10lvN+8HowGhv/VHltqoCdqTuJwp9IeO+RnLsSV9PYmh+2FBwUyZ73BdHnst76HBoij0u2iaKfot4+2yWn22g4LqeSEVCRGUy5Jd7GGujlwjgtkEYVOLXFlA62/nDGuvgVbrX0cRT9yEYpjo1Y2j8Y1pl6VsHanYJ1dJsrDGP+hab/5tOtiEMLFE50miaSQCNJsufa91o0fwNkXjBo4/Jeq43LKuJHO1jBhz7JtMTHNc1TYFA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/29/26 01:36, David Rientjes wrote: > Following up on this thread and the suggestion from Matthew (thank you!), > I think it would be useful to have a hwpoison requirements and roadmap > discussion on how its support is currently integrated into the core MM, > get an understanding of what the areas to improve are, and get a sense of > future work in this area that people are planning. > > This particular patch series is addressing an area of interest to Google, > but it's also quite clear from the thread that there are multiple areas to > improve for hwpoison in the core MM and it wouldn't hurt to get more > insight into what dependencies users have on it. > > I'd propose this for discussion in one of our upcoming Linux MM Alignment > Sessions: Wednesday, September 16 9-10am PDT (UTC-7). > > No specific agenda other than to gather core MM developers with hwpoison > developers and discuss: > - where validation should live, esp with regard to the page allocator, or > strict invariants in the page allocator > + implications for the fastpath > - handling for folios of arbitary orders > - handling partial folio poisoning and split failures > - race conditions between memory_failure() and concurrent > alloc/free/compaction > - soft offline for pages in the pcp lists There is also the hugetlb hwpoison oddity. -- Cheers, David